ВЕНТИЛЬНЫЙ ЭЛЕКТРОПРИВОД КОЛЕБАТЕЛЬНОГО ДВИЖЕНИЯ

Изобретение относится к области электротехники и может быть использовано в электроприводах сканирования, калибровки, измерения, контроля и управления, а также в автоматизированных электроприводах механизмов с колебательным движением рабочего органа. Техническим результатом является улучшение энергетических показателей вентильного электропривода колебательного движения за счет формирования колебательного режима работы с регулируемыми выходными параметрами движения и поддержания резонансного режима работы при регулировании частоты колебаний за счет регулирования собственного позиционного момента. Вентильный электропривод колебательного движения содержит вентильный двигатель с двумя обмотками на статоре, задающий генератор, выпрямитель, соединенный своим выходом с входом фильтра низкой частоты, инвертор напряжения, выход которого подключен ко второй статорной обмотке двигателя. Первая статорная обмотка вентильного двигателя подключена к выходу преобразователя напряжения, вход которого соединен ...

Rotor control method and device

The present techniques generally relate to electric motor which may include one or more sensors usable to determine rotor alignment and/or speed. A method and apparatus for rotor alignment and/or speed error detection and/or correction are proposed, such as using signals from one or more sensors. A method and apparatus for controlling stator tooth activation based, at least in part, on corrections and offsets is also disclosed.

Magnetic resistance type composite rotors high speed motor is assisted to axial permanent magnetism

The utility model provides a magnetic resistance type composite rotors high speed motor is assisted to axial permanent magnetism relates to high speed motor technical field. This motor is decided therotor salient pole by the three -phase 64 that two sets of magnetic poles are relevant and is constituted composite construction, and including two sets of stator core, two sets of rotor core, pivot,armature winding, casing, magnetic materials, permanent magnet and permanent magnet protective sheath, the magnetic resistance composite rotors is assisted to two sets of rotor core, magnetic materials and permanent magnet constitution permanent magnetism, and is together rotatory along with the pivot. The utility model discloses a magnetic resistance composite rotors is assisted to permanent magnetism, can reduce excitation current and excitation loss and power converter's capacity when improving electric efficiency and power factor.

Motor control apparatus for vector-controlling sensorless motor

A motor control apparatus that vector-controls a sensorless motor includes an estimating unit configured to obtain an estimated phase value by estimating a phase of a rotor in the sensorless motor, and a generating unit configured to generate, from the estimated phase value and a phase command value of the rotor, a phase conversion value that is used for a coordinate conversion between a rotary coordinate system and a static coordinate system in the vector control. The generating unit is further configured to output the phase command value as the phase conversion value when the rotor is caused to start to rotate, and change the phase conversion value so that the phase conversion value approaches the estimated phase value from a predetermined timing after the rotor is caused to start to rotate.

Monitoring device for a reluctance machine and method for monitoring

A monitoring device for a reluctance machine includes a vector rotator for rotating a space phasor of the reluctance machine that depends on a voltage in a coordinate system that rotates with a negative fundamental frequency, a low-pass filter filtering the rotated space phasor and producing an output signal, and a signal evaluation device evaluating the output signal. A DC value of the produced output signal in the rotating coordinate system is monitored, and an error in operating the reluctance machine is identified when the DC value is above a predefined threshold value.

MONITORING DEVICE FOR A RELUCTANCE MACHINE AND METHOD FOR MONITORING

Eine Überwachungseinrichtung (19) für eine Reluktanzmaschine (4) weist einen Vektordreher (20) zur Drehung eines Raumzeigers (21), einen Tiefpassfilter (22) für den gedrehten Raumzeiger (21) und eine Signalauswertung (23) für das Ausgangssignal des Tiefpassfilters (22) auf. Dies dient zur Überwachung der Reluktanzmaschine (4), wobei ein Raumzeiger (21) für den Fluss um eine negative Grundfrequenz transformiert wird und ein Gleichanteil überwacht wird.

Verfahren zur Speisung einer geschalteten Reluktanz- und Transversalflußmaschine

Sensor error detection and correction

The present techniques generally relate to electric motor which may include one or more sensors usable to determine rotor alignment and/or speed. A method and apparatus for rotor alignment and/or speed error detection and/or correction are proposed, such as using signals from one or more sensors. A method and apparatus for controlling stator tooth activation based, at least in part, on corrections and offsets is also disclosed.

A MODIFIED FLUX OBSERVER FOR SWITCHED RELUCTANCE MACHINES

... -32 Abstract A MODIFIED FLUX OBSERVER FOR SWITCHED RELUCTANCE MACHINES A control system (104) that includes a converter circuit (120) and a control device (122, 200) is disclosed. The converter circuit may (120) be configured to control a phase current of a switched reluctance machine (102). The control device (122, 200) may be configured to determine an estimated flux (310, 320) based on a bus voltage, a phase voltage, and a mutual voltage. The control device (122, 200) may be configured to determine a flux threshold (304, 314) based on the phase current, and determine a first limit (306, 316) and a second limit (308, 318) relative to the flux threshold (304, 314). The first limit (306, 316) and the second limit (308, 318) may be scaled relative to the flux threshold (304, 314) based on one or more of the target speed, the load demand, or the bus voltage. The control device (122, 200) may be configured to compare the estimated flux (310, 320) with the first limit (306, 316), and reset ...

Switched reluctance motor linkage non-linear modeling method

Switch reluctance motor sensorless control method based on virtual flux linkage and single-phase current detection

Senseless control device for synchronous reluctance motor

Sensorless Control of Switched Reluctance Machines for Low Speeds and Standstill

A method for determining rotor position of a switched reluctance (SR) machine having a rotor and a stator is provided. The method may include injecting a test pulse into one or more idle phases of the SR machine, determining a decoupled flux value based at least partially on a total flux value corresponding to the test pulse and a mutual flux value, and determining the rotor position based at least partially on the decoupled flux value. 1. A method for determining rotor position of a switched reluctance (SR) machine having a rotor and a stator , comprising:injecting a test pulse into one or more idle phases of the SR machine;determining a decoupled flux value based at least partially on a total flux value corresponding to the test pulse and a mutual flux value; anddetermining the rotor position based at least partially on the decoupled flux value.2. The method of claim 1 , wherein the test pulse is configured to have a substantially constant current height claim 1 , the test pulse being injected based at least partially on a measured phase current and rotor position feedback.3. The method of claim 1 , wherein the total flux value is determined based at least partially on a voltage integration of the test pulse.4. The method of claim 1 , wherein the mutual flux value is determined based on one or more predefined relationships between mutual flux values claim 1 , measured phase current values claim 1 , and rotor position feedback values.5. The method of claim 1 , wherein the decoupled flux value is determined based at least partially on a difference between the total flux value and the mutual flux value.6. The method of claim 1 , wherein the rotor position is determined based on one or more predefined relationships between decoupled flux values claim 1 , measured phase current values claim 1 , and rotor position values.7. A control system for a switched reluctance (SR) machine having a rotor and a stator claim 1 , comprising:a converter circuit in electrical ...

Switched reluctance motor control system

A device may receive a current measurement of a motor identifying a plurality of component currents associated with a plurality of phases. The device may determine a position estimate for the motor based on the plurality of component currents associated with the plurality of phases. The device may control the motor based on the plurality of component currents.

Power Based Pulse Injection Control for SR Self Sensing

Power based self-sensing of a rotor position of an SR motor at mid to high speeds and low torque is achieved by an SR motor control system by comparing the motor power to an injection maximum power. A position current pulse is injected to a stator pole in response to the motor power being less than the injection maximum power. An actual stator current created by the position current pulse is compared to an estimated stator current, and a stored estimated rotor position in a memory is updated to a new estimated rotor position if the actual stator current is not equal to the estimated stator current.

ITERATIVE FLUX IDENTIFICATION

For flux map identification, a method applies an initial voltage to a motor. The motor is a salient motor. The method generates a flux map for the motor. The method iteratively applies a variable voltage to the motor. The variable voltage includes a constant current change calculated from the flux map. The method iteratively modifies the flux map.

RELUCTANCE MOTOR WITH ELECTRICALLY CIRCUIT STATOR TURNS.

Manufacturing-sensitive control of high rotor pole switched reluctance motors

A method for controlling switched reluctance machine (SRM) utilizing a SRM control system. The method allows for adaptive pulse positioning over a wide range of speeds and loads. An initial rotor position is provided for the SRM utilizing an initialization mechanism. A pinned point on a phase current waveform is defined during an initial current rise phase of the current waveform. A slope of the current rise is determined as the current waveform reaches the pinned point. The slope is then fed to the commutation module of the SRM control system. An error signal from calculated inductance or current slope is used as an input to a control loop in the SRM control system. The time determining module determines an optimum time signal to fire a next pulse. The optimum time signal is fed to the SRM for turning the plurality of SRM switches to on and off states.

METHOD AND APPARATUS FOR QUASI-SENSORLESS ADAPTIVE CONTROL OF SWITCHED RELUCTANCE MOTOR DRIVES

A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched- reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched- reluctance motor, a load and a converter..

Sensorless control method for switched reluctance motor

The invention discloses a position-sensorless control method of a switched reluctance motor, and belongs to the field of position-sensorless control of the switched reluctance motor. An analog circuit is used for detecting an idle phase pulse current peak value, rising edge voltage signals are generated when the peak value is larger than a set threshold value, the rotating speed of the motor is calculated according to the time interval and the angle interval between the two rising edge voltage signals, and then the real-time position angle of the rotor is calculated. The difficulty that the sampling frequency of the analog-to-digital conversion module in the digital processor is insufficient at a relatively high rotating speed is overcome; the pulse injection frequency is adjusted through the rotating speed of the motor, so that unnecessary consumption of high-frequency pulses to resources of a digital processor at a relatively low rotating speed is avoided while the rotor position detection ...

Systems and methods for rotor position determination

Various embodiments are described herein for a system and method to eliminate mutual flux effect on rotor position estimation of switched reluctance motor (SRM) drives at rotating shaft conditions without a prior knowledge of mutual flux. Neglecting the magnetic saturation, the operation of conventional self-inductance estimation using phase current slope difference method can be classified into three modes: Mode I, II and III. At positive-current-slope and negative-current-slope sampling point of one phase, the sign of current slope of the other phase changes in Mode I and II, but does not change in Mode III. In one example embodiment, in order to operate the self-inductance estimation in Mode III, a variable-hysteresis-band current control method is proposed for the incoming phase and variable-sampling method is proposed for the outgoing phase.

METHOD FOR RELIABLE CONTROL OF HIGH ROTOR POLE SWITCHED RELUCTANCE MACHINE

A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; and estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position. 1. A sensorless reliable control system for a high rotor pole switched reluctance machine (HRSRM) utilizing a hybrid combination of self-inductance and mutual inductance values , the reliable control system comprising:a stator phase energizing module to excite at least one of a plurality of stator phases each having a winding, wherein each of the windings of the rest of the plurality of stator phases is in an open circuit state;a current and time measuring module to measure a current value through the at least one energized stator phase and time taken by the current value to reach a peak value or preset magnitude of current;a self-inductance determining module to determine a self-inductance value for the at least one energized stator phase;a storage module to store the self-inductance value and the current value for each of the plurality of stator phases;a voltage and time measuring module to measure a voltage value across an adjacent un-energized stator phase and time taken by the adjacent un-energized stator phase to attain the voltage value;a mutual-inductance determining module to determine a mutual inductance value between the at least one energized stator phase and the adjacent un-energized stator phase;a rotor position estimation module to ...

MANUFACTURING-SENSITIVE CONTROL OF HIGH ROTOR POLE SWITCHED RELUCTANCE MOTORS

A method for controlling switched reluctance machine (SRM) utilizing a SRM control system. The method allows for adaptive pulse positioning over a wide range of speeds and loads. An initial rotor position is provided for the SRM utilizing an initialization mechanism. A pinned point on a phase current waveform is defined during an initial current rise phase of the current waveform. A slope of the current rise is determined as the current waveform reaches the pinned point. The slope is then fed to the commutation module of the SRM control system. An error signal from calculated inductance or current slope is used as an input to a control loop in the SRM control system. The time determining module determines an optimum time signal to fire a next pulse. The optimum time signal is fed to the SRM for turning the plurality of SRM switches to on and off states. 1. A method for controlling a switched reluctance machine (SRM) comprising the steps of:a) providing an SRM control system having a commutation module;b) providing an initial rotor position for the SRM utilizing an initialization mechanism;c) defining a pinned point on a phase current waveform during an initial current rise phase of the current waveform;d) determining a slope of the current rise as the current waveform reaches the pinned point, the slope being fed to the commutation module;e) calculating an error signal and providing the error signal as an input to a control loop in the SRM control system; andf) determining an optimum time to fire a next pulse;whereby the SRM control system enables adaptive pulse positioning over a wide range of speeds and loads.2. The method of wherein the defined pinned point is static with respect to an underlying inductance value of the SRM.3. The method of wherein the pinned position is defined at a point corresponding to a magnitude between 50% and 100% of the steady state current on the initial current rise.4. The method of wherein the SRM control system is designed to utilize ...

МОНИТОРИНГОВОЕ УСТРОЙСТВО ДЛЯ РЕАКТИВНОЙ МАШИНЫ И СПОСОБ МОНИТОРИНГА

Изобретение относится к области электротехники, в частности к реактивной машине и её мониторингу. Технический результат заключается в надежной работе реактивной машины. Достигается тем, что мониторинговое устройство для реактивной машины имеет блок вращения вектора для вращения зависимого от напряжения пространственного вектора реактивной машины, имеет фильтр нижних частот для вращаемого пространственного вектора и блок оценки сигнала для выходного сигнала фильтра нижних частот, при этом с помощью блока вращения вектора пространственный вектор повернут во вращающуюся в обратном направлении с частотой вектора тока систему координат. 2 н. и 6 з.п. ф-лы, 5 ил.

Способ управления вентильно-индукторным электрическим двигателем

Изобретение относится к области электротехники и может быть использовано в электроприводах различных механизмов. Техническим результатом является повышение качества управления вентильно-индукторным электрическим двигателем. В способе управления вентильно-индукторным электрическим двигателем, включающем при каждом цикле управления измерение питающего напряжения, коррекцию частоты дискретизации токов фаз в зависимости от измеренной величины питающего напряжения, включение очередной фазы в зависимости от определенного ранее момента времени, измерение тока в ней, задание тока в ней, накопление дискретной по времени выборки тока этой фазы при его нарастании на измерительном интервале, формирование в этой фазе тока в зависимости от его заданного и измеренного значений по релейному закону, отключение этой фазы в зависимости от определенного ранее момента времени, выборку тока очередной включенной фазы последовательно группируют с выборкой тока предшествующей включенной фазы, далее определяют гармонический ...

DC commutator double-salient reluctance motor

A dc commutator double-salient reluctance motor is composed of a motor body, a commutator and a brush gear; the commutator cannot rotate along with a rotary shaft and the brush gear rotates along with the rotary shaft; the number of commutator bars connected with the winding is the lowest common multiple of the number of stator salient poles and rotor salient poles, and the number of electric brushes is at most equal to the number of rotor salient poles; the sequence of commutator bars connected with the winding is reverse to the distribution sequence of winding on the stator salient poles; the peripheral position of the commutator around the rotary shaft is changed to realize speed regulation, braking and reversal operation; the included angle of the front and rear edges of the electric brushes can be changed to change the output power and motor efficiency of the motor; the operation mode of the motor is the same to that of the switch reluctance motor, and the special vibration and noise ...

Motor control device

Based on three-phase electric excitation double-salient-pole motor without position sensor and method

APPARATUS FOR QUASI-SENSORLESS ADAPTIVE CONTROL OF SWITCHED RELUCT ANGE MOTOR DRIVES

A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched-reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched-reluctance motor, a load and a converter. 1. An apparatus for quasi-sensorless control of a high rotor pole switched-reluctance motor (HRSRM) comprising:a switched-reluctance motor (SRM) having a stator and a rotor;a three-phase inverter controlled by a processor connected to an input of the SRM;a load connected to the SRM via an inline torque meter;a converter connected to the load; and a rotor position estimation module to determine an initial position of the rotor utilizing a sequence of relation between phase inductances of the HRSRM;', 'a position estimation module designed to estimate rotor position and to establish a firm time base for the software control module;', 'a time base module to calculate shaft speed.', 'a slope monitoring module to monitor slope of the current waveform in the active phase;', 'a pulse time module to adjust pulse time based on the estimated time base; and', 'a dwell control module to fix a dwell angle and to establish a current band for controlling the dwell angle thereby operating the SRM at a saturation level., 'a software control module at the processor comprising2. The apparatus of wherein the three-phase inverter is adaptable to provide power supply to the SRM.3. The ...

MOTOR CONTROL DEVICE

In order to provide a motor control device for controlling the starting of a motor wherein the rotor of the motor can be caused to rotate more reliably in a desired rotational direction when the motor is started, this motor control device 1 is equipped with: an inductance detection unit 21 which, when the rotational position of the rotor 51 is estimated, applies a prescribed voltage to coils 58 of a plurality of phases and determines the inductance of the plurality of phases; a phase selection unit 22 which selects the phase among the plurality of phases for which the inductance is the smallest, as a first phase, and selects the phase for which the inductance is the next smallest, as a second phase; and an excitation phase determination unit 24 which, when the difference between the inductance of the first phase and the inductance of the second phase is equal to or less than a prescribed value, selects, as the phase to be excited from among the first phase and the second phase, the phase ...

MOTOR DRIVE DEVICE AND HEAT PUMP DEVICE

This motor drive device (50) that drives a motor (10) having three-phase windings comprises an inverter (13) that applies a desired voltage to the motor (10), and an inverter control unit (14) that controls the operation of the inverter (13). The inverter (13) comprises: a current detection unit (20) that detects DC current in a first connecting line (22a) among the three-phase connecting lines that connect the three-phase windings and the inverter (13); and a current detection unit (21) that detects AC current in a second connecting line (22b) among the three-phase connecting lines, and flows the maximum DC current to the first connecting line (22a) when in a first control mode in which rotor positioning of the motor (10) is performed.

SENSOR ERROR DETECTION AND CORRECTION

SWITCHED RELUCTANCE SELF SENSING ACTIVE PULSE TORQUE COMPENSATION

Steuereinrichtung für eine Rotationsmaschine

Steuereinrichtung (100) für eine Rotationsmaschine zum Steuern einer Rotationsmaschine (1), deren Induktivität eine variable Induktivitätskomponente aufweist, die sich mit einer Rotorposition ändert, mit einem Stromdetektor (2), der den durch die Rotationsmaschine (1) fließenden Rotationsmaschinenstrom erfasst; und einem Drehzahlschätzer (3), der eine geschätzte Rotationsgeschwindigkeit berechnet, die einem geschätzten Wert der Rotationsgeschwindigkeit eines Rotors entspricht, in Abhängigkeit der bewegten elektromotorischen Kraft, die eine induzierte Spannung ist, die aufgrund einer Änderung der Induktivität mit einer Rotorposition erzeugt wird. Die Steuereinrichtung für eine Rotationsmaschine (100) enthält eine PositionsBerechnungseinheit (4), die eine geschätzte Position berechnet, die einem geschätzten Wert der Rotorposition entspricht, wobei die geschätzte Drehzahl verwendet wird; und einen Regler (5), der eine Spannungsanweisung für eine Rotationsmaschine ausgibt, um die Rotationsmaschine ...

Method and apparatus for quasi-sensorless adaptive control of switched reluctance motor drives

A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched-reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched-reluctance motor, a load and a converter. Inductance Profile Cl) 0. 00 0 ,00 O CN')TICCD-COO- M- CONC')T )O-COOCN- CONC')TI)(or- COOIC'T- CN Rotor Position Phase A Phase B Phase C ...

Start method of the switched reluctance motor, controller and the implementation of its electric device

METHOD FOR CONTROLLING SWITCHED RELUCTANCE MOTOR WITH STEPPED FREEWHEELING AND WITHOUT POSITION SENSOR

Provided is a method for controlling a switched reluctance motor with stepped freewheeling and without position sensor. The method is for a switched reluctance motor system employing a dual-switches-per-phase power converter. When both an upper transistor (S1) and a lower transistor (S2) of a main switch of a phase of the power converter are shut off, the phase enters a negative-voltage forced freewheeling state, and the current (i) of the phase is measured, either the lower transistor or the upper transistor of the phase is turned on when the current of the phase decreases to a predetermined threshold, the phase enters a zero-voltage natural freewheeling state, and the current of the phase starts to increase; when the current of the phase increases to a peak value, the position of a rotor is the minimal phase inductance leading-end position (b) and directly serves as a turn-on position of the main switch of the phase, and the upper transistor and the lower transistor of the main switch ...

Vacuum assembly for automobile

The disclosed vacuum cleaner system for an automobile fits in a cavity in the vehicle and has a tank that can be removed in a lateral direction without tools and without detaching the vacuum hose. A circuit board that carries an electronic controller is positioned alongside the motor and extends generally parallel to both the axis of the motor and the lateral direction in which the tank is removed. Cooling air is drawn though a cooling air inlet on the cabin wall to the circuit board, and then one side of the motor, through the center of the motor, to the cooling fan. From there, it is blown into a cavity where it joins exhausted working air from the vacuum and is exhausted from the vehicle through an air release opening that leads to the exterior of the vehicle.

SENSORLESS CONTROL METHOD AND APPARATUS FOR A THREE-PHASE SWITCHED RELUCTANCE MOTOR

A sensorless control method and an apparatus for a three-phase switched reluctance motor. The sensorless control method obtains line inductances of three phases according to real-time phase inductances of the three-phase switched reluctance motor and then determines feature points of the line inductances of the three phases. A position angle of the rotor at any time in the next corresponding region is calculated according to an average rotation speed of the rotor in the region corresponding to two adjacent feature points. A control signal is output to realize a precise sensorless control for the three-phase switched reluctance motor. The control apparatus includes a microcontroller, a power conversion circuit, a drive module for the power conversion circuit, a current detection module, a voltage detection module, an input and output module and a direct current regulated power supply. 1. A sensorless control method for a three-phase switched reluctance motor , comprising:S1) obtaining phase inductances according to real-time phase inductances of three-phase windings of the three-phase switched reluctance motor;S2) dividing an electrical cycle of the three-phase switched reluctance motor into three conduction regions with a same electrical angle, and obtaining line inductances in a corresponding conduction region according to the phase inductances obtained in step S1 of the three-phase windings;{'o': {'@ostyle': 'single', 'sub': 'n', 'ω'}, 'S3) determining feature points of line inductances of three phases according to the line inductances obtained in step S2; calculating a position angle and an time interval of a region corresponding to the feature points of two adjacent line inductances; and calculating an average rotation speed of a rotor in the region corresponding to the feature points of the two adjacent line inductances according to the position angle and the time interval of the region;'}{'sub': 'n+1', 'o': {'@ostyle': 'single', 'sub': 'n', 'ω'}, 'S4) ...

Control device of rotary machine

ROTOR CONTROL METHOD AND DEVICE

Power based pulse injection control for SR self sensing

Power based self-sensing of a rotor position of an SR motor at mid to high speeds and low torque is achieved by an SR motor control system by comparing the motor power to an injection maximum power. A position current pulse is injected to a stator pole in response to the motor power being less than the injection maximum power. An actual stator current created by the position current pulse is compared to an estimated stator current, and a stored estimated rotor position in a memory is updated to a new estimated rotor position if the actual stator current is not equal to the estimated stator current.

MANUFACTURING-SENSITIVE CONTROL OF HIGH ROTOR POLE SWITCHED RELUCTANCE MOTORS

A method for controlling switched reluctance machine (SRM) utilizing a SRM control system. The method allows for adaptive pulse positioning over a wide range of speeds and loads. An initial rotor position is provided for the SRM utilizing an initialization mechanism. A pinned point on a phase current waveform is defined during an initial current rise phase of the current waveform. A slope of the current rise is determined as the current waveform reaches the pinned point. The slope is then fed to the commutation module of the SRM control system. An error signal from calculated inductance or current slope is used as an input to a control loop in the SRM control system. The time determining module determines an optimum time signal to fire a next pulse. The optimum time signal is fed to the SRM for turning the plurality of SRM switches to on and off states.

Switched reluctance motor speed control system

SENSORLESS AC MOTOR CONTROLLER

A controller for an AC electric motor, the controller including: a power converter driving the AC electric motor; a feed forward converter that derives voltage values provided to the power converter; and a load model unit configured to derive an applied rotor speed used for an input to the feed forward converter, wherein the applied rotor speed is derived using a stabilising speed correction value with a substantially zero average value.

Motor control device and method for controlling motor control device

Provided are a motor control device and a method for controlling a motor control device. Harmonics of an input current may be reduced by adjusting an output of an inverter.

Wavelet neural network switched reluctance motor position sensorless prediction control method

Four-quadrant position-sensorless control method for four-phase switch reluctance motor

Manufacturing-sensitive control of high rotor pole switched reluctance motors

A method for controlling switched reluctance machine (SRM) utilizing a SRM control system. The method allows for adaptive pulse positioning over a wide range of speeds and loads. An initial rotor position is provided for the SRM utilizing an initialization mechanism. A pinned point on a phase current waveform is defined during an initial current rise phase of the current waveform. A slope of the current rise is determined as the current waveform reaches the pinned point. The slope is then fed to the commutation module of the SRM control system. An error signal from calculated inductance or current slope is used as an input to a control loop in the SRM control system. The time determining module determines an optimum time signal to fire a next pulse. The optimum time signal is fed to the SRM for turning the plurality of SRM switches to on and off states.

Verfahren zum Betrieb eines Reluktanzmotors

Die Erfindung betrifft ein Verfahren zum Betrieb eines Reluktanzmotors (1), mit den Schritten:• Erfassen (100) der Zwischenkreisspannung (Ud) einer Ansteuerungsschaltung (2) des Reluktanzmotors (1),• Berechnen (200) eines Leitbereichs (LB) zur Ansteuerung des Reluktanzmotors (1) durch die Ansteuerungsschaltung (2),• Vergleichen (300) der erfassten Zwischenkreisspannung (Ud) mit einem ersten oberen Grenzwert (G1) der Zwischenkreisspannung (Ud) und vorzugsweise, im Falle des Erreichens oder Überschreitens des ersten oberen Grenzwerts (G1), mit einem zweiten oberen Grenzwert (G2) der Zwischenkreisspannung (Ud), und• im Falle des Unterschreitens des ersten oberen Grenzwerts (G1) der Zwischenkreisspannung (Ud) durch die erfasste Zwischenkreisspannung (Ud),o Ansteuern (500a) des Reluktanzmotors (1) durch die Ansteuerungsschaltung (2) mit dem berechneten Leitbereich (LB), sonst• im Falle des Erreichens oder Überschreitens des ersten oberen Grenzwerts (G1) oder vorzugsweise eines zweiten oberen ...

Method and apparatus for control of switched reluctance motors

Rotor position detection of a switched reluctance device

Adjustable pulse injection in electric machine control

Rotor control method and device

Electric motors may include one or more sensors usable to determine rotor alignment and/or speed. A method and apparatus for rotor alignment and/or speed error detection and/or correction are proposed, such as using signals from one or more sensors. A method and apparatus for controlling stator tooth activation based, at least in part, on corrections and offsets is also disclosed.

Reliable control of multi-rotor pole switch reluctance motor

Method and apparatus for quasi-sensorless adaptive control of switched reluctance motor drives

A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched- reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched- reluctance motor, a load and a converter..

Method and apparatus for quasi-sensorless adaptive control of switched reluctance motor drives

A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched- reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched- reluctance motor, a load and a converter..

REAL TIME EARLY FAULT PREDICTION OF SWITCHED RELUCTANT MOTORS FOR AUTOMOTIVE APPLICATIONS

REAL TIME EARLY FAULT PREDICTION OF SWITCHED RELUCTANT MOTORS FOR AUTOMOTIVE APPLICATIONS Switched reluctance motors posses exceptional capability of fault tolerance with robust configuration acting as promising technology for automotive applications. However, the power transistors are at high risks that are connected in the power converter of the drives of switched reluctance motors. Hence for safety critical applications, it is crucial for real time early fault prediction of switched reluctance motors. This invention investigates injection of high frequency signal for identification of fault occurrence with localization of power transistors in Switched reluctance motor drive. Conventional diagnostic techniques involves complex algorithm involved with current or voltage sensors, but in this invention a simpler method is investigated where the half bridge standard asymmetrical converter fed Switched reluctance motor drive is injected with sinusoidal signal for filtering the induced high ...

Method for controlling switched reluctance motor of pulse injection non-position sensor

METHOD AND APPARATUS FOR CONTROL OF SWITCHED RELUCTANCE MOTORS

A method of controlling a switched reluctance motor is disclosed herein. The motor comprises a stator carrying a plurality of phase windings and a rotor. The method comprises activating the phase windings in a sequence selected to apply torque to the rotor, wherein during a cycle of rotation of the rotor the phase windings switch between an active state in which current in the phase winding applies torque to the rotor and an inactive state; applying a voltage to a selected phase winding whilst the selected phase winding is in the inactive state to provide a flux in the selected phase winding; determining the current in the selected phase winding; determining the rotor angle based on the current and the flux; and controlling said activating based on the rotor angle.

MOTOR CONTROL APPARATUS, IMAGE FORMING APPARATUS, AND CONTROL METHOD OF MOTOR CONTROL APPARATUS

A parameter concerning rotation of a motor is estimated (first estimation). A parameter concerning rotation of the motor is estimated, based on a model representing a prescribed change in a rotation speed of the motor (second estimation). It is determined whether an anomaly has occurred in the rotation of the motor, based on the parameter estimated in the first estimation and the parameter estimated in the second estimation.

Sensorless control of switched reluctance machines

A control system for a switched reluctance (SR) machine having a rotor and a stator is provided. The control system may include a converter circuit in electrical communication between the stator and a common bus, and a controller configured to monitor a bus voltage of the converter circuit and a phase current of the SR machine. The controller may be configured to determine a phase voltage based on one or more of main pulses and any diagnostic pulses, determine an estimated flux based on the phase voltage and an associated mutual voltage, determine a rotor position based at least partially on the estimated flux, and control the SR machine based on the rotor position and a desired torque.

Reluktanzmotor

The invention relates to a reluctance motor (1) having a rotor (3) and a stator (2). The stator (2) has individual stator coils (6), and a predefined current (I) flows in one of the coils (6), in accordance with the engine (1) load. The invention aims to achieve adequate precision in determining the rotor position with simple and inexpensive measuring methods. To this end, the predefined current (I) is obtained by applying a constant voltage (U), and the time (t1, t2) necessary to reach the maximum current value (I Max) when applying this constant voltage (U) is measured, giving the value of the engine (1) load.

Method and apparatus for quasi-sensorless adaptive control of switched reluctance motor drives

A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched-reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched-reluctance motor, a load and a converter. Inductance Profile Cl) 0. 00 0 ,00 O CN')TICCD-COO- M- CONC')T )O-COOCN- CONC')TI)(or- COOIC'T- CN Rotor Position Phase A Phase B Phase C ...

Manufacturing-sensitive control of high rotor pole switched reluctance motors

A method for controlling switched reluctance machine (SRM) utilizing a SRM control system. The method allows for adaptive pulse positioning over a wide range of speeds and loads. An initial rotor position is provided for the SRM utilizing an initialization mechanism. A pinned point on a phase current waveform is defined during an initial current rise phase of the current waveform. A slope of the current rise is determined as the current waveform reaches the pinned point. The slope is then fed to the commutation module of the SRM control system. An error signal from calculated inductance or current slope is used as an input to a control loop in the SRM control system. The time determining module determines an optimum time signal to fire a next pulse. The optimum time signal is fed to the SRM for turning the plurality of SRM switches to on and off states.

Position sensorless rotor position estimation method of switch reluctance machine running at high speed

Motor acceleration methods

CIRCUIT ARRANGEMENT FOR COMMUTATING A RELUCTANCE MOTOR

A circuit arrangement is described for commutating a reluctance motor having a rotor (2) movable relative to a stator (1) and having a winding to which in specific positions of the rotor (2) relative to the stator (1) a current is applied by means of a switching device, and including a detection arrangement by which a voltage induced in the winding is detected and which enables the switching device when the induced voltage reaches a predetermined value. In a circuit arrangement of this type a simple, modular and thus universally usable structure is achieved in that the winding comprises at least three winding sections (110, 210, 310) arranged substantially equidistant along the motion coordinate (w) of the rotor (2) and winding sections that can individually admit current, so that from each winding section (110) the voltage (U1) induced therein is tapped and the enable signal (at 119) is derived when the predetermined value is reached, as a result of which signal the power supply to the ...

Method for reliable control of high rotor pole switched reluctance machine

A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; and estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position.

ROTOR POSITION DETECTION APPARATUS AND MOTOR CONTROL APPARATUS

A rotor position detection apparatus (Y) is applied to a SR motor (10) including a stator (12) having salient poles (11a-11c) corresponding to a plurality of phases, each salient pole (11a-11c) having excitation windings (15a-15c), and a rotor (14) disposed in the stator (12) and provided with a plurality of salient poles (13). A magnetic flux detection means (X) is provided with a detection part in a position where a magnetic flux generated by a phase current in the stator (12) is detected. The apparatus (Y) includes a threshold value holding unit (21) holding the magnetic flux detected by the detection part as a threshold value, when the rotor (14) is located at a predetermined detection position; and a comparison unit (25) comparing a threshold value with the magnetic flux, wherein the apparatus (Y) detects that the rotor (14) has reached a predetermined position, based on the comparison result of the unit (25).

Elektronisch kommutierter Motor

An electronically-commutated motor is disclosed, comprising an inductive and/or capacitive rotor position determination, which records a surface area in which the stator and rotor poles (10-15; 17-20) are opposite each other. The total area is taken into account for the positional determination. The pole angles ( beta S, beta R) for stator and rotor poles (10-15; 17-20) are each fixed at values which result in a change of area on a rotor rotation.

A three-phase switched reluctance motor four-quadrant position-sensorless control method

모터 가속 방법

... 향상된 스위치드 릴럭턴스 모터(switched reluctance motor)의 기동 방법은 회전자를 그것의 초기 위치로 가져가기 위해 가압된 두 개의 이웃하는 코일 쌍을 사용한다. 하나의 코일 쌍이 꺼지고 회전자는 초기의 회전 속도를 갖기 위해 다른 하나의 코일 쌍에 의해 유도된다. 중간 스테이지는 모든 코일의 정상 싸이클이 사용될 수 있는 이후, 모터의 단 하나의 코일 쌍을 사용하여 모터를 작동 속도까지 올린다.

CONTROL DEVICE

In a sensorless control of a motor, due to the characteristic of a response frequency, an induced voltage, a magnetic pole position estimation gain, a current control gain, and a speed control gain are closely related. An object of the invention is to enable the induced voltage and the frequency characteristic of a magnetic pole position estimation system to be clearly designed and to theoretically and quantitatively design all of the control gains necessary for the sensorless control so as to solve a problem that a method of designing those parameters cannot be established and the parameters have to be adjusted in a try and error manner. A control device has an estimator estimating an estimation induced voltage and a phase error of a motor by applying an induced-voltage observer and a controller controlling the motor on the basis of the estimation induced voltage and the phase error. 1. A control device , comprising:an estimator estimating an estimation induced voltage and a phase error of a motor by applying an induced-voltage observer, anda controller controlling the motor on the basis of the estimation induced voltage and the phase error,wherein the estimator comprises the induced-voltage observer, an induced-voltage computing unit and a phase computing unit,wherein the induced-voltage computing unit dividing the estimation induced voltage by an induced-voltage coefficient, andwherein the phase computing unit performs integration by multiplying the phase error with an error angle integration gain.2. The control device according to claim 1 ,wherein the estimator comprises a first subtractor,wherein the first subtractor obtains the magnetic pole position estimation value by subtracting a computation result of the phase computing unit from a computation result of the induced-voltage computing unit.3. The control device according to claim 2 ,wherein the induced-voltage observer estimates the estimation induced voltage and the phase error of the motor on the basis of ...

POWER TOOL WITH DIGITAL VARIABLE RELUCTANCE MOTOR CONTROL

A power tool includes a control for the motor of the power tool that senses an operating characteristic of the motor and controls the operation of the power tool based on the sensed characteristic. The sensed characteristic includes variations in reluctance of the motor. A controller may sense changes on load on the motor as a result of interaction between a working element such as a saw blade or drill bit and the work piece. The controlled operation may include variation in speed or torque or both, or may include stopping the motor. Emergency conditions may be sensed by changes in reluctance.

Variable-flux memory motor and methods of controlling a variable-flux motor

In one aspect, embodiments of the invention are directed to a multi-pole rotor of a variable-flux memory motor (VFMM) that includes: a rotor core; and a plurality of poles. Each of the poles includes: one or more soft rotor magnets; a first ferrous wedge; and a second ferrous wedge. The one or more soft rotor magnets are disposed between the first and second ferrous wedges in a circumferential direction of the rotor.

Sensorless control of switched reluctance machines for low speeds and standstill

A method for determining rotor position of a switched reluctance (SR) machine having a rotor and a stator is provided. The method may include injecting a test pulse into one or more idle phases of the SR machine, determining a decoupled flux value based at least partially on a total flux value corresponding to the test pulse and a mutual flux value, and determining the rotor position based at least partially on the decoupled flux value.

Method and system for resolving position of switched reluctance motor rotor

Non-position sensor initial positioning control method for switched reluctance motor

METHOD AND APPARATUS FOR QUASI-SENSORLESS ADAPTIVE CONTROL OF SWITCHED RELUCTANCE MOTOR DRIVES

A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched- reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched- reluctance motor, a load and a converter..

Method to control a switched reluctance motor

A method to control the rotor position in a reluctance motor includes: energizing a phase winding to an energized state so as to move a rotor relative to a stator; switching the phase winding between the energized state and a freewheeling state over a pulsing period to produce a plurality of phase current pulses wherein the phase current freewheels in the freewheeling state over a freewheeling period of each current pulse; sampling rates of change of phase current and amplitudes of phase current during a plurality of freewheeling periods; de-energizing the phase winding; and computing the angular position of the rotor.

ROTATIONSMASCHINEN-STEUERVORRICHTUNG

Eine Rotationsmaschinen-Steuervorrichtung (100) umfasst einem Stromdetektor (2) zum Erfassen eines durch eine Rotationsmaschine (1) fließenden Rotationsmaschinen-Ströme, einem Positionsschätzer (3) zum Schätzen einer Rotorposition, einer Steuerung (4) zum Ausgeben eines Rotationsmaschinen-Spannungsbefehls zum Antreiben der Rotationsmaschine (1) auf Basis des Rotationsmaschinen-Stroms und der Rotorposition, und einem Spannungs-Applikator (5) zum Anlegen einer Spannung an die Rotationsmaschine (1) auf Basis des Rotationsmaschinen-Spannungsbefehls. Der Positionsschätzer (3) schätzt die Rotorposition aus einer variablen Flussverkettungs-Induktivitäts-Komponente, die durch eine variable Induktivitäts-Komponente und den Rotationsmaschinen-Strom erzeugt wird.

Schaltungsanordnung zum Kommutieren eines Reluktanzmotors

Switch reluctance motor sensorless control method and device based on phase inductance non-saturation region positioning

MANUFACTURING-SENSITIVE CONTROL OF HIGH ROTOR POLE SWITCHED RELUCTANCE MOTORS

A method for controlling switched reluctance machine (SRM) utilizing a SRM control system. The method allows for adaptive pulse positioning over a wide range of speeds and loads. An initial rotor position is provided for the SRM utilizing an initialization mechanism. A pinned point on a phase current waveform is defined during an initial current rise phase of the current waveform. A slope of the current rise is determined as the current waveform reaches the pinned point. The slope is then fed to the commutation module of the SRM control system. An error signal from calculated inductance or current slope is used as an input to a control loop in the SRM control system. The time determining module determines an optimum time signal to fire a next pulse. The optimum time signal is fed to the SRM for turning the plurality of SRM switches to on and off states.

ROTOR POSITION DETECTION APPARATUS AND MOTOR CONTROL APPARATUS

SWITCHED RELUCTANCE MOTOR CONTROL SYSTEM

A device may receive a current measurement of a motor identifying a plurality of component currents associated with a plurality of phases. The device may determine a position estimate for the motor based on the plurality of component currents associated with the plurality of phases. The device may control the motor based on the plurality of component currents.

System and method for permanent magnet assisted synchronous reluctance motor control from zero or low speed

System and method for robust sensorless control of permanent magnet assisted synchronous reluctance (PM-SyR) motor. The system and method includes startup control of a motor with known rotor position/speed, but unknown rotor magnetic polarity of a motor exhibiting rotor magnetic anisotropy or saliency. The system and method includes a rotor characteristic detection method for a PM-SyR motor that detects rotor magnetic polarity based on the variation of the inductance that is caused by the leakage flux paths in the rotor barrier bridges and utilizes the detected rotor magnetic polarity for improved motor startup.

ROTOR POSITION DETECTION APPARATUS AND MOTOR CONTROL APPARATUS

The rotor position detection apparatus Y is applied to an SR motor 10 comprising a stator 12 which is provided with salient poles 11 (11a, 11b, 11c) corresponding to a plurality of phases, each salient pole 11 (11a, 11b, 11c) provided with an excitation winding 15a, 15b, 15c and a rotor which is disposed in the stator and provided with a plurality of salient poles 13. The rotor position detection apparatus comprises a micro constant current application unit (circuit) 23 which applies a micro constant current to the excitation winding, and a polarity inversion detection means X which detects polarity inversion of a magnetic flux appearing in the stator 12 of the SR motor 10, thereby detecting a salient pole opposed position through a magnetic flux polarity inversion position.

Switched reluctance in-wheel motor position sensorless prediction control method

Method for starting and controlling switch reluctance motor no-rotor position sensor

Switch reluctance motor control method suitable for vehicle heavy-load characteristic

CONTROL DEVICE FOR ROTARY MACHINE

A control device (100) for rotary machines comprises: a current detector (2) that detects rotary machine current flowing to a rotary machine (1); a position estimator (3) that estimates a rotor position; a controller (4) that outputs rotary machine voltage commands for driving the rotary machine (1), on the basis of the rotary machine current and the rotor position; and a voltage application unit (5) that applies voltage to the rotary machine (1) on the basis of the rotary machine voltage commands. The position estimator (3) estimates the rotor position from a linkage flux inductance AC component generated by an inductance AC component and the rotary machine current.

MANUFACTURING-SENSITIVE CONTROL OF HIGH ROTOR POLE SWITCHED RELUCTANCE MOTORS

A method for controlling switched reluctance machine (SRM) utilizing a SRM control system. The method allows for adaptive pulse positioning over a wide range of speeds and loads. An initial rotor position is provided for the SRM utilizing an initialization mechanism. A pinned point on a phase current waveform is defined during an initial current rise phase of the current waveform. A slope of the current rise is determined as the current waveform reaches the pinned point. The slope is then fed to the commutation module of the SRM control system. An error signal from calculated inductance or current slope is used as an input to a control loop in the SRM control system. The time determining module determines an optimum time signal to fire a next pulse. The optimum time signal is fed to the SRM for turning the plurality of SRM switches to on and off states.

Multiphase synchronous motor controller with angle tracking

A method for controlling a multiphase synchronous motor, for a motor flux vector includes setting a first winding of the motor to a floating state in which the first winding is electrically floating; setting a voltage across a second winding of the motor for a first period; receiving first voltage samples associated with the first winding in the first period; setting the voltage across the second winding to a second period, in which the first period and the second period are periods of one or more pulse width modulation cycles, in which a polarity of the voltage across the second winding in the second period is opposite to a polarity of the voltage across the second winding in the first period; receiving second voltage samples associated with the first winding in the second period; and determining a position of the rotor based on the first and second voltage samples.

METHOD AND APPARATUS FOR QUASI-SENSORLESS ADAPTIVE CONTROL OF SWITCHED RELUCTANCE MOTOR DRIVES

Switch reluctance motor sensorless control device based on phase inductance non-saturation region positioning

A switch reluctance motor without position sensor high speed operation control method

Method for controlling non-position sensor of switched reluctance motor with double sampling points

Initial driving apparatus and method of two-phase srm

Disclosed herein are an initial driving apparatus and method of a two-phase switched reluctance motor (SRM). The initial driving apparatus of a two-phase SRM includes: a driving unit; a current measuring unit; a memory; and a controlling unit comparing the currents measured in the current measuring unit and a difference between the currents with the data currents and the difference between the data currents stored in the memory to determine an initial position, thereby initially driving the SRM. Therefore, the two-phase SRM may be stably operated.

Method for the sensorless communication detection of electronically commutated electric motors

The invention relates to a method for the sensorless commutation detection of electronically commutated electric motors, in which the phase current is interrupted for a blanking time in order to detect the zero passage. On the basis of the profile of the mutual induction voltage, a decay time, which is characteristic for a decay of the phase current, is determined within the blanking time and the start of the blanking time is determined as a function of the time difference between the decay time and the end of the blanking time.

CONTROL DEVICE AND METHOD FOR ESTABLISHING THE ROTOR ANGLE OF A SYNCHRONOUS MACHINE

A method for establishing the rotor angle of a synchronous machine. The method includes determining a first estimated value for the d-axis of the synchronous machine, feeding at least one refinement voltage pulse pair into the stator of the synchronous machine, the refinement voltage pulse pairs each distanced from the first estimated value for the d-axis of the synchronous machine by the same angular value in different directions, detecting the angle-dependent refinement current responses to the refinement voltage pulses, determining the angle-dependent refinement phase differences on the basis of the respective detected refinement current response, determining first estimated curves on the basis of at least some of the angle-dependent refinement current responses, determining second estimated curves on the basis of at least some of the angle-dependent refinement phase differences. and determining a refined estimated value for the d-axis of the synchronous machine on the basis of the estimated curves. 130101. A method () for establishing the rotor angle (β) of a synchronous machine () , said method comprising:{'b': 31', '101, 'determining () a first estimated value (β1) for the d-axis of the synchronous machine ();'}{'b': 32', '101', '101, 'feeding () at least one refinement voltage pulse pair, each having a predefinable pulse length and pulse height, into the stator of the synchronous machine (), wherein the refinement voltage pulse pairs are distanced from the first estimated value (d1) for the d-axis of the synchronous machine () by the same angular value (−x; +x) in different directions;'}{'b': '33', 'detecting () the angle-dependent refinement current responses (M1; M2; M3; M4) to the refinement voltage pulses;'}{'b': '34', 'determining () the angle-dependent refinement phase differences (N1; N2; N3; N4) on the basis of the respective detected refinement current response (M1; M2; M3; M4);'}{'b': '35', 'determining () first estimated curves (K1; K2) on the ...

CONTROL DEVICE AND METHOD FOR ESTABLISHING THE ROTOR ANGLE OF A SYNCHRONOUS MACHINE

A method and a device for establishing the rotor angle of a synchronous machine. In one embodiment, the method includes the steps of feeding at least one initial voltage pulse of predefinable pulse length and pulse height into the stator of the synchronous machine, detecting the respective current response to the at least one initial voltage pulse, determining the respective phase difference on the basis of the respective detected current response, establishing at least one first estimated value by comparing the current response with a current response characteristic curve of the synchronous machine, establishing at least one second estimated value by comparing the phase difference with a phase difference characteristic curve of the synchronous machine, forming a multiplicity of differences between each of the first estimated values and each of the second estimated values, and determining an initial estimated value for the rotor angle of the synchronous machine on the basis of the determined difference having the lowest value. 1. A method for establishing the rotor angle of a synchronous machine , said method comprising:feeding at least one initial voltage pulse of predefinable pulse length and pulse height into the stator of the synchronous machine;detecting the respective current response to the at least one initial voltage pulse;determining the respective phase difference on the basis of the respective detected current response;establishing at least one first estimated value by comparing the current response with a current response characteristic curve of the synchronous machine;establishing at least one second estimated value by comparing the phase difference with a phase difference characteristic curve of the synchronous machine;forming a multiplicity of differences between each of the first estimated values and each of the second estimated values; anddetermining an initial estimated value for the rotor angle of the synchronous machine on the basis of the ...

Sensorless Control Device for DC Fuel Pump

Provided is a sensorless control device for a DC fuel pump that may be downsized as compared to a conventional control device for a DC fuel pump and may implement the same operation at a relatively low cost, and the sensorless control device for a DC fuel pump.

MOTOR CONTROL APPARATUS, IMAGE READING APPARATUS AND IMAGE FORMING APPARATUS

A motor control apparatus operable to control a motor includes a phase determiner for determining a rotational phase of a rotor of the motor, and a controller having a first control mode for controlling a driving current flowing through a winding of the motor based on a current of a predetermined magnitude, and a second control mode for controlling a driving current flowing through the winding so that a deviation between a command phase representing a target phase of the rotor and a rotational phase determined by the phase determiner is reduced. The controller executes the first control mode without executing the second control mode in a case of rotating the motor in a first direction, and executes the second control mode in a case of rotating the motor in a second direction which is a reverse direction to the first direction. 1. A motor control apparatus operable to control a motor , comprising:a phase determiner for determining a rotational phase of a rotor of the motor; anda controller having a first control mode for controlling a driving current flowing through a winding of the motor based on a current of a predetermined magnitude, and a second control mode for controlling a driving current flowing through the winding so that a deviation between a command phase representing a target phase of the rotor and a rotational phase determined by the phase determiner is reduced,wherein the controller executes the first control mode without executing the second control mode in a case of rotating the motor in a first direction, and executes the second control mode in a case of rotating the motor in a second direction which is a reverse direction to the first direction.2. The motor control apparatus according to claim 1 ,further comprising a detector configured to detect the driving current flowing through the winding of the motor,wherein the phase determiner determines the rotational phase of the rotor based on the driving current detected by the detector, andthe ...

ROTATION ANGLE ESTIMATION APPARATUS FOR ROTATING ELECTRIC MACHINE

A rotation angle estimation apparatus includes: a high-frequency voltage setting unit that sets high-frequency voltages; a circuit operating unit that operates an electric power conversion circuit to apply each of the high-frequency voltages to a corresponding one of winding groups of a rotating electric machine; and a rotation angle estimating unit that estimates a rotation angle of the rotating electric machine based on at least one of high-frequency currents that flow in the winding groups upon application of the high-frequency voltages to the winding groups. Moreover, the high-frequency voltage setting unit sets the high-frequency voltages based on the spatial phase difference between the winding groups so that in a fixed coordinate system of the rotating electric machine, the magnitude of a resultant vector of a plurality of high-frequency voltage vectors, which are respectively applied to the winding groups, becomes smaller than the magnitude of each of the high-frequency voltage vectors. 1. A rotation angle estimation apparatus for a rotating electric machine , the rotation angle estimation apparatus being applied to a system which includes the rotating electric machine and an electric power conversion circuit , the rotating electric machine including a stator having a plurality of winding groups wound therein , each of the winding groups being offset from another of the winding groups to have a spatial phase difference therebetween , the electric power conversion circuit being electrically connected with the winding groups to apply voltages to the winding groups ,the rotation angle estimation apparatus comprising:a high-frequency voltage setting unit that sets a plurality of high-frequency voltages which change at an angular velocity higher than an electrical angular velocity of the rotating electric machine;a circuit operating unit that operates the electric power conversion circuit to apply each of the high-frequency voltages set by the high-frequency ...

MOTOR DRIVING DEVICE AND VACUUM PUMP

A motor driving device comprises: an inverter having a plurality of switching elements for driving a motor; an arithmetic section for calculating a rotational speed and a magnetic pole electric angle of a motor rotor based on information about a motor phase voltage and information about a motor phase current; a delay correcting section for correcting a phase delay of the magnetic pole electric angle calculated by the arithmetic section so as to generate corrected magnetic pole electric angle; a driving command generating section for generating a sinusoidal wave driving command based on a difference between the rotational speed and a target rotational speed and the corrected magnetic pole electric angle; and a PWM signal generating section for generating a PWM control signal for controlling on/off of the plurality of switching elements based on the sinusoidal wave driving command. 1. A motor driving device comprising:an inverter having a plurality of switching elements for driving a motor;an arithmetic section for calculating a rotational speed and a magnetic pole electric angle of a motor rotor based on information about a motor phase voltage and information about a motor phase current;a delay correcting section for correcting a phase delay of the magnetic pole electric angle calculated by the arithmetic section so as to generate a corrected magnetic pole electric angle;a driving command generating section for generating a sinusoidal wave driving command based on a difference between the rotational speed and a target rotational speed and the corrected magnetic pole electric angle; anda PWM signal generating section for generating a PWM control signal for controlling on/off of the plurality of switching elements based on the sinusoidal wave driving command.2. The motor driving device according to claim 1 , whereinthe information about the motor phase voltage is a motor phase voltage detection signal input via a first low-pass filter, and the information about the ...

Method for ascertaining a position of a rotor of an electrical machine

A method for ascertaining a position of a rotor relative to a stator of an electrical machine having a permanently excited rotor and a plurality of windings for the stator or vice versa; in response to an energization of at least one of the windings, a change in an inductance of the winding being ascertained; and, on the basis of the change in the inductance of the winding, the position of the rotor being ascertained relative to the stator.

Method for reliable control of high rotor pole switched reluctance machine

A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; and estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position.

MOTOR DRIVING APPARATUS AND METHOD

A motor driving apparatus may include an inverter unit applying a starting voltage to a plurality of coils of a motor apparatus, a detection unit detecting currents generated by the starting voltage in the plurality of respective coils, and a controlling unit determining inductive rising times of the currents by the starting voltage in the plurality of respective coils using the detected currents and determining a position of a rotor using lengths of the inductive rising times. 1. A motor driving apparatus comprising:an inverter unit applying a starting voltage to a plurality of coils of a motor apparatus;a detection unit detecting currents generated by the starting voltage in the plurality of respective coils; anda controlling unit determining inductive rising times of the currents generated by the starting voltage in the plurality of respective coils, and determining a position of a rotor using lengths of the inductive rising times.2. The motor driving apparatus of claim 1 , wherein the controlling unit determines a reference coil having a shortest inductive rising time and determines the position of the rotor using a current or a voltage of the reference coil.3. The motor driving apparatus of claim 2 , wherein the controlling unit includes a lookup table including data with respect to positions of the rotor claim 2 , and selects a position of the rotor corresponding to the current or the voltage detected from the reference coil claim 2 , from the lookup table.4. The motor driving apparatus of claim 2 , wherein the controlling unit verifies the reference coil using hysteresis comparison between the inductive rising times.5. The motor driving apparatus of claim 4 , wherein the controlling unit performs a hysteresis comparison by comparing inductive rising times of one or more coils adjacent to the reference coil with the inductive rising time of the reference coil to thus verify whether or not the reference coil has a shortest inductive rising time among the ...

MANUFACTURING-SENSITIVE CONTROL OF HIGH ROTOR POLE SWITCHED RELUCTANCE MOTORS

A method for controlling switched reluctance machine (SRM) utilizing a SRM control system. The method allows for adaptive pulse positioning over a wide range of speeds and loads. An initial rotor position is provided for the SRM utilizing an initialization mechanism. A pinned point on a phase current waveform is defined during an initial current rise phase of the current waveform. A slope of the current rise is determined as the current waveform reaches the pinned point. The slope is then fed to the commutation module of the SRM control system. An error signal from calculated inductance or current slope is used as an input to a control loop in the SRM control system. The time determining module determines an optimum time signal to fire a next pulse. The optimum time signal is fed to the SRM for turning the plurality of SRM switches to on and off states. 1. An SRM control system for controlling an SRM , the system comprising:an initialization module to provide an initial rotor position for the SRM utilizing an initialization mechanism;{'sub': 'on', 'a point defining module to define a pinned point on a phase current waveform of a pulse during an initial current rise phase of the current waveform, the current waveform starting to rise in correspondence of an inductance rise (Θ) of a phase of the SRM, wherein the pinned point is defined at a point corresponding to a magnitude between 50% and 100% of the steady state current on the initial current rise;'}a slope determining module to determine a slope of the current rise as the current waveform reaches the pinned point;a commutation module to receive the slope of the current rise from the slope determining module and a frequency input signal;an error calculating module to calculate an error signal of the pulse based on the slope of the current rise for feeding to a control loop in the SRM control system; anda time determining module to determine an optimum time to fire a next pulse using the error signal;whereby the SRM ...

ADAPTIVE HOLD CURRENT FOR ELECTRIC MOTORS

In a method for generating a blocking moment in a standstill state of an electrically commutated electric motor having at least two windings, on which electric motor a possibly varying load moment acts from outside in the standstill state, first, a blocking current is supplied at a maximum value into a first winding. This blocking current is successively reduced to, possibly, a minimum value. From that moment the inductivity of the electric motor is controlled, namely by controlling the blocking current if the control deviation between the actual value and the set value of the inductivity exceeds a predetermined threshold value. Thereby, it is possible to control the blocking current in an adaptive manner insofar as, despite a varying load moment, the standstill state of the electric motor can be maintained by varying the blocking current. 112.-. (canceled)13. A method for generating a blocking moment in a standstill state of an electrically commutated electric motor having at least two windings , wherein , on the electric motor a varying load moment acts from outside in the standstill state , wherein , in the method ,a) a blocking current with a predetermined maximum value is supplied into a winding terminal of a first winding,b) a motor inductivity parameter is determined which represents an inductivity of the electric motor when the blocking current with the predetermined maximum value is supplied thereto in the standstill state, and a value of the motor inductivity parameter when the blocking current with the predetermined maximum value is supplied thereto forms an initial value,c) it is attempted, by successively reducing the blocking current, to achieve a deviation of the value of the motor inductivity parameter from the initial value by more than a predetermined control deviation,d) in case the deviation of the value of the motor inductivity parameter from the initial value by more than the predetermined control deviation does not occur, the reduction of the ...

METHOD AND DEVICE FOR DETERMINING THE POSITION OF A BRUSHLESS ELECTRIC DRIVE

A method for determining the position of an at least two-phase, in particular three-phase bmshless electric drive comprising at least two phase windings, each of which has a first and a second terminal, a second terminal of a first phase winding being electrically connected to the first terminal of a second phase winding at a common connecting terminal. In order to be able to reliably determine the position of the electric drive even at low speeds, a voltage pulse is applied between the first terminal of the first phase winding and the second terminal of the second phase winding, the resulting voltage at the connecting terminal or at a third phase winding connected thereto is detected and the voltage ratio between the first phase winding and the second phase winding is determined therefrom, and the ratio between the variable inductances is determined from said voltage ratio. 1. A method for determining a position of an at least two-phase or three-phase brushless electric drive with at least two phase windings that each have a respective first and second terminal , a second terminal of a first phase winding being electrically connected to the first terminal of a second phase winding at a shared connecting point , the method comprising:applying at least one voltage pulse between the first terminal of the first phase winding and the second terminal of the second phase winding;detecting a voltage prevailing at the connecting point or at a third phase winding that is connected to it;determining a voltage division ratio between the first phase winding and second phase winding based on the detected voltage; anddetermining, based on the voltage division ratio, a ratio between the variable inductances, wherein, if the prevailing voltage is to be detected in the third phase winding, the voltage pulse is applied while the third phase winding is currentless.2. The method according to claim 1 , wherein the voltage induced in the phase windings by a movement of the electric drive ...

CAMERA MODULE

A camera module includes a lens barrel configured to be movable; a detection target disposed on one side of the lens barrel; an integrated coil and a sensing coil facing the detection target and disposed in a direction perpendicular to a direction of movement of the lens barrel; a driver configured to apply a driving signal to the integrated coil; and a position detector configured to detect a position of the lens barrel according to an inductance of the integrated coil and an inductance of the sensing coil, wherein a width of the integrated coil in the direction perpendicular to the direction of movement of the lens barrel and a width of the sensing coil in the direction perpendicular to the direction of movement of the lens barrel change in the direction of movement of the lens barrel. 1. A camera module comprising:a lens barrel configured to be movable;a detection target disposed on one side of the lens barrel;an integrated coil and a sensing coil facing the detection target and disposed in a direction perpendicular to a direction of movement of the lens barrel;a driver configured to apply a driving signal to the integrated coil; anda position detector configured to detect a position of the lens barrel according to an inductance of the integrated coil and an inductance of the sensing coil,wherein a width of the integrated coil in the direction perpendicular to the direction of movement of the lens barrel and a width of the sensing coil in the direction perpendicular to the direction of movement of the lens barrel change in the direction of movement of the lens barrel.2. The camera module of claim 1 , wherein the width of the integrated coil in the direction perpendicular to the direction of movement of the lens barrel and the width of the sensing coil in the direction perpendicular to the direction of movement of the lens barrel increase or decrease in opposite directions in the direction of movement of the lens barrel.3. The camera module of claim 1 , wherein ...

Motor controller

A motor controller is configured to stabilize a motor current. The motor controller is used for driving a motor, where the motor has a motor coil. The motor controller comprises a switch circuit, a control unit, a command unit, a counting unit, a comparing unit, and a phase detecting unit. The switch circuit is used for supplying the motor current to the motor coil. The phase detecting unit generates a phase signal to the control unit, so as to inform the control unit to switch phases. The control unit generates a plurality of control signals to control the switch circuit. The motor controller resets the counting unit based on the phase signal, such that the control signals are synchronized with the phase signal for stabilizing the motor current.

METHOD AND DEVICE FOR DETERMINING THE POSITION ANGLE OF A ROTOR IN AN ELECTRIC SYNCHRONOUS MACHINE

The invention relates to a method and device for determining the position angle of a rotor () in an electric synchronous machine (). The device is designed to comprise: a voltage generator () for generating electrical voltage pulses at angles in a coordinate system fixed in respect of the stator when the rotor () is stationary; a measuring device () for measuring any electrical current value returning to the electrical voltage pulses generated by the voltage generator (); and a computing device (), which is designed: —to store a current signal curve of the current values measured; —to generate a zero-mean current signal curve by shifting the current signal curve or the measured current values; —to compute an integral function () of the zero-mean current signal curve; and—to determine the position angle of the rotor () on the basis of the computed integral function (). 121. A method for determining the position angle of a rotor () of an electric synchronous machine () , the method comprising:{'b': 10', '3', '1', '2', '1, 'generating (S) in each case at least one electric voltage pulse with predetermined electrical angles in a stator-fixed coordinate system, referred to as a stator () of the electric synchronous machine (), when the rotor () of the synchronous machine () is stationary;'}{'b': '20', 'measuring (S) in each case at least one respective electrical current value arising from the generated electrical voltage pulses;'}{'b': '30', 'storing (S) a current signal profile of the measured current values;'}{'b': '40', 'generating (S) a mean-value-free current signal profile by shifting the stored current signal profile or the measured current values;'}{'b': 50', '83, 'calculating (S) an integral function () of the mean-value-free signal current profile; and'}{'b': 60', '2', '83, 'determining (S) the position angle of the rotor () on the basis of the calculated integral function ().'}2. The method as claimed in claim 1 ,wherein a respective electrical angle which is ...

Systems and Methods for Determining Motor Parameters

The present disclosure provides a system and method to determine at least one parameter of a motor, such as an inductance. The inductance can be determined, such as based on one or more digitally sampled motor winding currents. A digital filter can be applied to the digital samples such as to determine a slope of the motor winding currents. The digital filter can include a least squares fit that can be applied to the digital samples, such as to determine a slope of the motor winding currents. The least squares fit can be determined based on a computation of central tendencies such as an average value of time, an average value of current, an average value of the square of time, and the average value of the product of time and current. The average values can be determined recursively to provide improved computational speed. 1. A method for determining at least one motor parameterusing an adaptive filter in a motor control system , the method comprising:sampling at least one phase current being supplied to at least one motor winding to form a set of sampled data points;analyzing the set of sampled data points with a fitting function; anddetermining at least one motor parameter based on at least one parameter of the fitting function.2. The method of wherein analyzing the set of sampled data points with a fitting function includes:selecting at least one fitting window based on at least one phase voltage being switched on and off to the at least one motor winding, the at least one fitting window selected to exclude at least one transient component of the at least one phase current and including a subset of the sampled data points; andfiltering the subset of sampled data points corresponding to the at least one fitting window, to determine the at least one parameter of the fitting function.3. The method of claim I wherein the fitting function is a linear function and the at least one parameter of the fitting function includes a slope and an offset of the linear function.4. ...

METHOD FOR DETERMINING THE ROTARY POSITION OF THE ROTOR OF AN ELECTRIC MACHINE

A method for determining the rotary position of the rotor of an electric machine, which includes star-connected phase conductors, wherein a measurement signal representing the rotary position of the rotor within a magnetic half-period is determined from the potential at the star point. At a measurement time a specified voltage is applied to the ends of all the phase conductors by forcing the star point to a specific potential. At a time following the measurement time a voltage that deviates from the specified voltage is applied to the ends of one of the phase conductors. Then the measurement signal is derived from the current that develops from the measurement time in a connection of the star point to the specified potential. 111-. (canceled)12. A method for determining rotational position of the rotor of an electric machine having star-connected phase conductors , wherein a measurement signal representative of the rotational position of the rotor within a magnetic half-period is acquired , the method comprising the steps of:applying a specified voltage at a measurement time point to ends of all of the phase conductors to force the star point to a specified potential;applying, at a time following the measurement time, a voltage different from the specified voltage to the ends of one of the phase conductors; andderiving the measurement signal from current that develops between the measurement time and the following time at a connection forcing the star point to the specified potential.13. The method according to claim 12 , including determining a rise in the current over time to derive the measurement signal.14. The method according to claim 12 , including determining a rise in the current which starts from the measurement time and a rise which starts from the following time to derive the measurement signal.15. The method according to claim 14 , including determining a difference between the two rise values as the measurement signal.16. The method according to claim ...

MOTOR CONTROL DEVICE

A motor control device includes an instruction position detector that calculates, as an instruction position detection value, a position detection value at an external instruction timing. The instruction position detector includes an internal counter, a detection position calculator, and a correction value generator. The internal counter outputs a count value counted at a cyclic interval shorter than a position read cycle that is an interval at which a motor position detected by a rotary encoder mounted on a motor is read as a position detection value. The detection position calculator controls a rotation of the motor by use of the position detection value, is supplied with an external detection instruction signal including an instruction pulse, and calculates the instruction position detection value by use of a count value at the external instruction timing indicated by an edge of the instruction pulse. The correction value generator includes an external input terminal, an input circuit, a count value acquisition unit, and a correction value calculator. 1. A motor control device comprising an internal counter that outputs a count value counted at a cyclic interval shorter than a position read cycle that is an interval at which a motor position detected by a rotary encoder mounted on a motor is read as a position detection value,', 'a detection position calculator that controls a rotation of the motor by use of a count value acquired at the interval of the position read cycle and the position detection value, is supplied with an external detection instruction signal including an instruction pulse, and calculates an instruction position detection value by use of a count value at an external instruction timing indicated by an edge of the instruction pulse, and', an external input terminal that is supplied with the external detection instruction signal,', 'an input circuit that performs analog processing causing a pulse delay on the external detection instruction ...

METHOD FOR RELIABLE CONTROL OF HIGH ROTOR POLE SWITCHED RELUCTANCE MACHINE

A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; and estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position. 1. A method for reliable control of a high rotor pole switched reluctance machine (HRSRM) , the method comprising the steps of:(a) providing an HRSRM comprising a rotor and a stator with a plurality of stator phases each having a winding;(b) energizing at least one of the plurality of stator phases at a stator phase energizing module, wherein each of the windings of the rest of the plurality of stator phases is in an open circuit state;(c) measuring a current value through the at least one energized stator phase and time taken by the current value to reach a peak value or preset magnitude of current at a current and time measuring module;(d) determining a self-inductance value for the at least one energized stator phase at a self-inductance determining module;(e) measuring a voltage value across an adjacent un-energized stator phase and time taken by an adjacent un-energized stator phase to attain the voltage value at a voltage and time measuring module, wherein the winding of the adjacent un-energized stator phase is in a short circuit state; and(f) determining a mutual inductance value between the at least one energized stator phase and the adjacent un-energized stator phase at a mutual-inductance determining module.2. The method of wherein the ...

SWITCHED RELUCTANCE MOTOR CONTROL SYSTEM

A device may receive a current measurement of a motor identifying a plurality of component currents associated with a plurality of phases. The device may determine a position estimate for the motor based on the plurality of component currents associated with the plurality of phases. The device may control the motor based on the plurality of component currents. 1. A switched reluctance motor control system , comprising:a memory; and cause a current to be provided to a switched reluctance motor;', 'determine a plurality of component currents associated with a plurality of phases based on a result of causing the current to be provided to the switched reluctance motor;', 'determine that a first component current, of the plurality of component currents, is equal to a second component current of the plurality of component currents;', 'determine, based on whether a third component current, of the plurality of component currents, is greater than or less than the first component current and the second component current, an angular position estimate for the switched reluctance motor; and', 'control, based on the angular position estimate, the switched reluctance motor., 'one or more processors configured to2. The switched reluctance motor control system of claim 1 , wherein the one or more processors are configured to determine the angular position estimate without receiving information identifying a position measurement or a speed measurement.3. The switched reluctance motor control system of claim 1 , wherein the switched reluctance motor is included in a machine.4. The switched reluctance motor control system of claim 1 , wherein the one or more processors when causing the current to provided claim 1 , are configured to: 'wherein the current is associated with a priming voltage of the inverter.', 'cause an inverter of the switched reluctance motor to provide the current,'}5. The switched reluctance motor control system of claim 1 , wherein the angular position estimate is ...

APPARATUS EMPLOYING COIL INDUCTANCE DETERMINATION AND METHOD FOR OPERATING THE APPARATUS

The invention relates to an apparatus having an electric motor with a stator, an armature, especially a rotor, and at least one coil, wherein the apparatus further comprises detection means configured to determine the inductance L of the coil by measuring at least one electrical quantity related to the coil during operation of the motor. The invention further relates to a method for operating such an apparatus, wherein the detection means of the apparatus determine the inductance L of the coil and/or the position of the armature as a function of the inductance L of the coil by measuring at least one electrical quantity related to the coil during operation of the motor. 113-. (canceled)14. An apparatus ,comprising an electric motor with a stator, an armature, especially a rotor, and at least one coil,wherein the apparatus further comprises detection means configured to determine the inductance L of the coil by measuring at least one electrical quantity related to the coil during operation of the motor and{'sub': on', 'off, 'wherein the apparatus further comprises a pulse width modulation (PWM) circuitry configured to control the electric motor, wherein the PWM circuitry is configured to connect the coil to a voltage supply during charge time periods Tand to disconnect the coil from the voltage supply during discharge time periods T, wherein'}{'sub': 'off', 'the detection means are configured to determine a discharge current from the coil during discharge time periods T.'}15. The apparatus according to claim 14 , characterized in that the detection means are further configured to determine the position of the armature as a function of the inductance L of the coil during operation of the motor claim 14 , especially when the armature is in motion.16. The apparatus according to claim 14 , characterized in that the detection means are configured to determine a length of a time period for a discharge current from the coil dropping from a first given current value to a ...

CONTROL DEVICE

In a sensorless control of a motor, due to the characteristic of a response frequency, an induced voltage, a magnetic pole position estimation gain, a current control gain, and a speed control gain are closely related. An object of the invention is to enable the induced voltage and the frequency characteristic of a magnetic pole position estimation system to be clearly designed and to theoretically and quantitatively design all of the control gains necessary for the sensorless control so as to solve a problem that a method of designing those parameters cannot be established and the parameters have to be adjusted in a try and error manner. A control device has an estimator estimating an estimation induced voltage and a phase error of a motor by applying an induced-voltage observer and a controller controlling the motor on the basis of the estimation induced voltage and the phase error. 1. A control device comprising:an estimator estimating an estimation induced voltage and a phase error of a motor by applying an induced-voltage observer, anda controller controlling the motor on the basis of the estimation induced voltage and the phase error.2. The control device according to claim 1 ,wherein the estimator comprises:an induced-voltage observer estimating an estimation induced voltage and a phase error of the motor on the basis of a magnetic pole position estimation value of the motor estimated in the past, a target voltage, and a response current;an induced-voltage computing unit dividing the induced voltage by an induced-voltage coefficient;a phase computing unit performing integration by multiplying the phase error with an error angle integration gain, anda first subtracter obtaining a magnetic pole position estimation value by subtracting a computation result of the phase computing unit from a computation result of the induced-voltage computing unit.3. The control device according to claim 2 , further comprising:a speed computing unit calculating a rotation speed ...

ROTOR POSITION SENSING SYSTEM FOR PERMANENT MAGNET SYNCHRONOUS MOTORS AND RELATED METHODS

Implementations of a system for sensing rotor position of a PMSM may include: a controller which may be coupled with the PMSM. The controller may be configured to apply a plurality of voltage vectors to the PMSM to generate a plurality of sensing signals from a stator of the PMSM in response. A comparator may be coupled to the PMSM configured to receive and to compare each one of the plurality of sensing signals with a threshold voltage. A rise time measurement circuit may calculate a plurality of rise times using the plurality of sensing signals in response to receiving a signal from the comparator. The rotor-angle estimation circuit may be configured to identify from the plurality of rise times a shortest rise time and a voltage vector corresponding with the shortest rise time and thereby identify the position of the rotor of the PMSM. 1. A system for sensing rotor position of a permanent magnet synchronous motor , comprising:a controller configured to couple with a permanent magnet synchronous motor (PMSM), wherein the controller is configured to apply a plurality of voltage vectors to the PMSM to generate a plurality of sensing signals from a stator of the PMSM in response;a rise time measurement circuit configured to couple to the PMSM, wherein the rise time measurement circuit is configured to calculate a plurality of rise times using at least a first threshold current and a second threshold current;a memory coupled with the rise time measurement circuit, wherein the memory is configured to store the plurality of rise times; anda rotor-angle estimation circuit coupled with the memory, wherein the rotor-angle estimation circuit is configured to calculate a rotor position relative to the stator of the PMSM using the plurality of rise times;wherein the controller is configured to generate the first threshold current and the second threshold current.2. The system of claim 1 , further comprising an amplifier coupled to a resistor claim 1 , wherein the amplifier is ...

Rotor position sensing system for three phase motors and related methods

A system and method for sensing rotor position of a three-phase permanent magnet synchronous motor (PMSM) includes a controller coupled with the PMSM and causing a plurality of voltage pulses to be applied thereto. A timer and/or an analog-to-digital converter is coupled with the PMSM and measures a plurality of values (measured values) from a three-phase inverter coupled with the PMSM. Each measured value may correspond with one of the plurality of voltage pulses and includes a current value or time value corresponding with an inductance of the PMSM. One or more logic elements calculates, based on the measured values and on one or more position algorithms, a position of a rotor of the PMSM relative to a stator of the PMSM. The system is configured to calculate the position of the rotor when the rotor is in a stopped configuration and when the rotor is in a rotating configuration.

METHOD AND APPARATUS FOR CONTROL OF SWITCHED RELUCTANCE MOTORS

A method of controlling a switched reluctance motor is disclosed herein. The motor composes a stator carrying a plurality of phase windings and a rotor. The method comprises activating the phase windings in a sequence selected to apply torque to the rotor. Wherein during a cycle of rotation of the rotor the phase windings switch between an active state in which current in the phase winding applies torque to the rotor and an inactive state, applying a voltage to a selected phase winding whilst the selected phase winding is in the inactive state to provide a flux in the selected phase winding: determining the current in the selected phase winding; determining the rotor angle based on the current and the flux, and controlling said activating based on the rotor angle. 1. A method of controlling a switched reluctance motor , the motor comprising a stator carrying a plurality of phase windings and a rotor , the method comprising:activating the phase windings in a sequence selected to apply torque to the rotor, wherein during a cycle of rotation of the rotor the phase windings switch between an active state in which current in the phase winding applies torque to the rotor and an inactive state;applying a voltage to a selected phase winding whilst the selected phase winding is in the inactive state to provide a flux in the selected phase winding;determining the current in the selected phase winding;determining the rotor angle based on the current and the flux; andcontrolling said activating based on the rotor angle.2. The method of comprising determining the flux by integrating the voltage as a function of time.3. The method of wherein determining the rotor angle comprises applying a flux mapping to the current and the flux.4. The method of wherein the flux mapping is selected based on the rotor speed and a torque demand signal.5. The method of wherein the flux mapping comprises an association between rotor angle claim 3 , phase winding flux claim 3 , and phase winding ...

Pole direction detection device and pole direction detection method

A pole direction detection device for detecting a pole direction of a synchronous motor having saliency comprises a high-frequency voltage application unit that applies a high-frequency voltage to the motor; an excitation phase change unit that changes an excitation phase of the motor to an arbitrary phase; a driving current detection unit that detects a driving current value of the motor; a pole direction estimation unit that detects a pole direction based on the excitation phase and the driving current value; a measurement unit that measures an inductance value of the motor; and a control unit that changes a frequency of the high-frequency voltage to be applied by the high-frequency voltage application unit based on the inductance value measured by the measurement unit.

Method for reliable control of high rotor pole switched reluctance machine

A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; storing the self-inductance value and the first current value for each of the stator phases; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; storing the mutual inductance value and the second current value for each of the stator phases; estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position.

SENSORLESS MOTOR CONTROL

A controller circuit for a brushless direct current (BLDC) motor may be configured to estimate a rotor position of the BLDC motor and apply a constant start-up voltage to a stator winding of the BLDC motor using the estimated rotor position until a current at the stator winding corresponds to a local minimum current. The controller circuit may be further configured to, in response to the current at the stator winding corresponding to the local minimum current, allow commutation of the current at the stator winding, calculate the rotor position in response to allowing the commutation of the current at the stator winding, and commutate the current at the stator winding using the calculated rotor position. 120-. (canceled)21. A controller circuit for a brushless direct current (BLDC) motor , the controller circuit being configured to:estimate an initial rotor position of the BLDC motor;apply an initial voltage or an initial current at a stator winding of the BLDC motor based on the estimated initial rotor position of the BLDC motor;in response to the initial voltage or the initial current applied at the stator winding satisfying a predetermined condition, allow commutation of a current at the stator winding;calculate a rotor position in response to allowing the commutation of the current at the stator winding; andcommutate the current at the stator winding using the calculated rotor position.22. The controller circuit of claim 21 , wherein the controller circuit is configured to:apply the initial voltage at the stator winding of the BLDC motor until the current at the stator winding corresponds to a local minimum current; andin response to the current at the stator winding corresponding to the local minimum current, allow the commutation of the current at the stator winding.24. The controller circuit of claim 22 , wherein the controller circuit is configured to determine the current at the stator winding corresponds to the local minimum current when a time derivative ...

MOTOR CONTROL APPARATUS FOR SENSORLESS MOTOR, AND IMAGE FORMING APPARATUS

A motor control apparatus includes: a supply unit configured to supply a current for excitation to a plurality of coils of a motor; a first detection unit configured to detect a physical quantity which varies depending on a change in inductance of at least one of the plurality of coils; a determination unit configured to determine a rotational position of a rotor of the motor based on the physical quantity detected by the first detection unit; and a control unit configured to control the rotational position of the rotor of the motor based on a determination result by the determination unit. 1. A motor control apparatus comprising:a supply unit configured to supply a current for excitation to a plurality of coils of a motor;a first detection unit configured to detect a physical quantity which varies depending on a change in inductance of at least one of the plurality of coils;a determination unit configured to determine a rotational position of a rotor of the motor based on the physical quantity detected by the first detection unit; anda control unit configured to control the rotational position of the rotor of the motor based on a determination result by the determination unit.2. The motor control apparatus according to claim 1 , further comprising:a second detection unit configured to detect an induced voltage of each of the plurality of coils, whereinthe determination unit is further configured to determine the rotational position of the rotor based on the physical quantity detected by the first detection unit when the rotor is at rest and when a rotational speed of the rotor is smaller than or equal to a predetermined value, and determine the rotational position of the rotor based on the induced voltage detected by the second detection unit when the rotational speed of the rotor is greater than the predetermined value.3. The motor control apparatus according to claim 2 , whereinthe determination unit is further configured to determine the rotational speed of the ...

METHOD FOR DETERMINING A MULTIPHASE MOTOR CURRENT AND ELECTRIC MOTOR DRIVE

A method for determining a motor current of an electric motor drive with a power source and with an electric motor and with a power converter connected therebetween, wherein an input current of the power source is converted by a pulse width modulated control of a number of semiconductor switches of the power converter into the motor current, wherein an intermediate circuit current of an intermediate circuit of the power source is influenced during the pulse width modulated control of the semiconductor switches, wherein an inductive voltage change is detected at a measuring point of the intermediate circuit due to the influence on the intermediate circuit current, and wherein a value for the generated motor current is determined based on the pulse width modulated control of the semiconductor switches and the inductive voltage change detected at the measuring point. 1. A method for determining a motor current of an electric motor drive with a power source and with an electric motor and with a power converter connected therebetween , the method comprising:converting wherein an input current of the power source via a pulse width modulated control of a number of semiconductor switches of the power converter into the motor current;influencing an intermediate circuit current of an intermediate circuit of the power source during the pulse width modulated control of the semiconductor switches;detecting an inductive voltage change at a measuring point of the intermediate circuit due to the influence on the intermediate circuit current; anddetermining a value for the generated motor current based on the pulse width modulated control of the semiconductor switches and the inductive voltage change detected at the measuring point.2. The method according to claim 1 , wherein the inductive voltage change detected at the measuring point is amplified.3. The method according to claim 1 , wherein the inductive voltage change is integrated at the measuring point.4. The method according ...

Method and Device for Controlling a Synchronous Machine without a Position Sensor by Means of Unique Assignment of the Flux Linkage to the Rotor Position

A method is for use with a synchronous machine having a stator and a rotor with or without permanent magnets. In operation, electric current of the synchronous machine responsive to the synchronous machine being actuated via clocked terminal voltages is measured. A magnetic flux linkage is determined based on the clocked terminal voltages and the measured electric current. A profile of the magnetic flux linkage as a function of rotation of the rotor, under a boundary condition of an at least two-dimensional electric current vector that is unchanged in coordinates of the stator, is used to detect a position of the rotor. The synchronous machine is controlled according to the rotor position. 1. A method for use with a synchronous machine having a stator and a rotor with or without permanent magnets , the method comprising:measuring electric current of the synchronous machine responsive to the synchronous machine being actuated via clocked terminal voltages;determining a magnetic flux linkage based on the clocked terminal voltages and the measured electric current;using a profile of the magnetic flux linkage as a function of rotation of the rotor, under a boundary condition of an at least two-dimensional electric current vector that is unchanged in coordinates of the stator, to detect a position of the rotor, andcontrolling the synchronous machine according to the rotor position.2. The method according to further comprising:storing multiple profiles of the magnetic flux linkage as a function of the rotor rotation in a model for different electric current values, from which a profile is selected according to the measured electric current, by which the position of the rotor is detected.3. The method according to wherein:only the magnetic flux linkage and the electric current vector, and the stored profiles of the magnetic flux linkage, are used for detecting the position of the rotor, and the position of the rotor is neither directly nor indirectly fed back to detect a ...

METHOD FOR RELIABLE CONTROL OF HIGH ROTOR POLE SWITCHED RELUCTANCE MACHINE

A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; and estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position. 1. A method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system , the method comprising:providing an HRSRM with a rotor and a stator with plurality of stator phases each having a winding;energizing at least one of the plurality of stator phases at a stator phase energizing module;measuring a first current value through the at least one energized stator phase and time taken by the first current value to reach a first peak value or present magnitude of current at a first current and time measuring module, wherein each of the windings of the rest of the plurality of stator phases is in an open circuit state;determining a self-inductance value for the at least one energized stator phase;measuring a second current value through an adjacent un-energized stator phase and time taken by the adjacent un-energized stator phase to reach a second peak value of current at a second current and time measuring module, wherein the winding of the adjacent un-energized stator phase is in a short circuit state;determining a mutual inductance value between the at least one energized stator phase and the adjacent un-energized stator phase;estimating a rotor position utilizing a hybrid combination of ...

MOTOR DRIVING APPARATUS CAPABLE OF RELIABLY STARTING MOTOR, AND METHOD OF CONTROLLING SAME

A motor driving apparatus includes a motor and a control circuit that controls driving of the motor. The motor includes a rotor having a cylindrical magnet having an outer peripheral surface circumferentially divided and alternately multi-polar magnetized to different poles, a first and second yokes having first and second magnetic pole portions arranged opposed to the outer peripheral surface, a first and second coils energized to excite the first and second magnetic pole portions, respectively. Directions of energizing the first and second coils are switched based on outputs from magnetic sensors that detect a rotational position of the rotor to change excited poles of the first and second magnetic pole portions. The rotor is started from a stopped state, after performing direct current energization to move the rotor to a position dependent on the direct current energization. 1. A motor driving apparatus comprising:a motor, anda control circuit that controls driving of the motor,the motor including:a rotor having a magnet that has a cylindrical shape and an outer peripheral surface which is divided in a circumferential direction and is alternately multi-polar magnetized to different poles,a first yoke having first magnetic pole portions which are arranged in an opposed relationship to the outer peripheral surface of the magnet,a first coil that is energized to thereby excite the first magnetic pole portions,a second yoke having second magnetic pole portions which are arranged in an opposed relationship to the outer peripheral surface of the magnet at respective positions shifted from the first magnetic pole portions each by a predetermined electrical angle, anda second coil that is energized to thereby excite the second magnetic pole portions,wherein the control circuit drives the rotor by switching respective directions of energizing the first coil and the second coil based on outputs from a plurality of position detection sensors that detect a rotational ...

Method and System for Determining the Position of a Synchronous Motor's Rotor

To establish an initial/resting position of a permanent magnet rotor, all motor stator windings are stimulated (voltage applied thereto) in sequence, the time it takes for current in the stimulated stator winding to rise to a specific current value is measured for each stator winding and these time measurement results processed. From the measured time results rotor position to within 60 degrees is determined and the position sector is known prior to starting/rotating the motor. Once the rotor position is known, the next commutation point in a six step sequence is known before actually starting/rotating the motor. Position measurement winding stimulation may be interleaved with commutation pulses, or the unexcited stator winding may be stimulated between commutation pulses to the other two excited stator, wherein one of the two stator windings remains connected to the power and provides a current return path to the unexcited but stimulated stator winding. 1. A method for determining a rotor position in a synchronous three phase motor , said method comprising the steps of:coupling combinations of two of three stator windings to a first voltage;coupling third ones of the three stator windings to a second voltage;measuring first times for currents through all combinations of the three stator windings to equal a reference current; anddetermining a rotor position from the measured first times.2. The method according to claim 1 , further comprising the steps of:coupling combinations of the two of the three stator windings to the second voltage;coupling the third ones of the three stator windings to the first voltage;measuring second times for currents through all combinations of the three stator windings to equal the reference current; anddetermining the rotor position from the measured first and second times.3. The method according to claim 1 , wherein the electrical sector comprises 60 electrical degrees and is one of six electrical sectors comprising 360 electrical ...

IMAGE FORMING APPARATUS

An image forming apparatus includes a stacking unit, a pickup roller, a motor having a winding, a rotor, and a phase, an image forming unit, an operation unit, and a receiving unit. The motor drives the pickup roller to feed a recording medium stacked on the stacking unit. The image forming unit forms an image on the fed medium. A user operates the operation unit to set an image forming condition. When, in a state where the winding is not excited, the operation unit is operated before the receiving unit receives an instruction to start forming the image, an initial operation is executed in a rotor stop state that supplies current to the winding and determines the motor phase based on the current flowing through the winding. When the instruction is received after the initial operation, the winding receives current such that the rotor rotates based on the determined phase. 1. An image forming apparatus comprising:a stacking unit on which a recording medium is to be stacked;a pickup roller configured to feed the recording medium stacked on the stacking unit;a motor configured to drive the pickup roller;an image forming unit configured to form an image on the recording medium fed by the pickup roller;an operation unit configured to be used by a user to set a condition of the image forming performed by the image forming unit;a receiving unit configured to receive an instruction to start forming the image by the image forming unit; and to execute an initial operation to supply current to a winding of the motor in a stop state in which a rotor of the motor is at stop and to determine a phase of the rotor having been in the stop state based on the current flowing through the winding, in a case where the operation unit is operated before the receiving unit receives the instruction in a state where a winding of the motor is not excited; and', 'to control the current to be supplied to the winding such that the rotor having been in the stop state rotates based on the phase ...

MOTOR CONTROL APPARATUS AND MOTOR CONTROL METHOD

A motor control apparatus includes a fixed phase setting section that sets a fixed phase of a motor according to a detection signal. At the start of rotation of a rotor, the fixed phase setting section sets a first fixed phase that is equal to or greater than −90 degrees relative to a stable stopping point at a maximum electrical angle and is equal to or less than 90 degrees relative to a stable stopping point at a minimum electrical angle of the rotor as the fixed phase, and sets a second fixed phase that is equal to or greater than −90 degrees relative to a stable stopping point at a maximum electrical angle and is equal to or less than 90 degrees relative to a stable stopping point at a minimum electrical angle of the rotor. 1. A motor control apparatus that controls driving of a motor , comprising:a rotation position detecting section that, at every 180 degrees of an electrical angle of the motor, outputs two kinds of detection signals according to a rotation position of a rotor of the motor;a fixed phase setting section that sets a fixed phase of the motor according to the detection signal;an estimated phase calculating section that calculates an estimated phase using the detection signal and the fixed phase; anda motor drive control section that controls rotation of the rotor based on the fixed phase or the estimated phase;wherein:the fixed phase setting section:at a start of rotation of the rotor, in accordance with the detection signal, sets as the fixed phase a first fixed phase that is equal to or greater than −90 degrees in terms of electrical angle relative to a stable stopping point at a maximum electrical angle and is equal to or less than 90 degrees in terms of electrical angle relative to a stable stopping point at a minimum electrical angle among stable stopping points of the rotor, andupon the kind of the detection signal that is outputted from the rotation position detecting section switching due to rotation of the rotor, in accordance with the ...

SWITCHED RELUCTANCE MACHINE HAVING A SWITCH FOR CHANGING THE NUMBER OF TURNS

A switched reluctance motor includes a ferromagnetic rotor, a stator with stator poles each including a winding with at least one winding strand, and at least two winding strands of a stator pole or at least two winding strands on diametrically opposite stator poles being assigned to a motor phase, the at least two winding strands being between a first supply line connected to a DC voltage source and a second supply line connected to an earth connection, and each winding strand being assigned an upper electronic switch and a lower electronic switch each including a freewheeling diode arranged in parallel. The motor further includes a controller to control the electronic switches of the circuits as a function of the position of the rotor. 111-. (canceled)12. A switched reluctance motor , comprising:a ferromagnetic rotor;a stator with stator poles each including a winding with two winding strands of a stator pole or two winding strands arranged on diametrically opposed stator poles being assigned to one motor phase;a first supply line connected to a DC voltage source and a second supply line connected to a ground terminal, the two winding strands being between the first supply line and the second supply line;first through fourth electronic switches, including an upper electronic switch and a lower electronic switch assigned to one of the two winding strands, each with a freewheeling diode arranged in parallel;a controller to control the first through fourth electronic switches depending on a position of the rotor, the two winding strands of a motor phase being connected in a common switching circuit via a cross branch in such a way, that the two winding strands of a motor phase are switchable between a parallel circuit and series circuit by the control of the electronic switches; andthe two winding strands of the motor phase are connected asymmetrically.13. The switched reluctance motor according to claim 12 , wherein the controller is configured or programmed to ...

PMSM ROTOR ANGLE IDENTIFICATION

A method and a control device for identifying the angle and polarity of the rotor of a permanent magnet synchronous motor (PMSM), the motor including a stator, including windings and a rotor including at least two permanent magnets. The method includes the steps of determining the rotor d-axis direction by supplying a stator voltage vector pulses to the motor terminals at at least two different stator angles, measuring the phase current at each angle, and determining rotor d-axis position based on motor inductance value in each stator angles calculated from the measured values and determining the rotor d-axis polarity by supplying a current vector to the motor terminals at the q-axis direction, and determining the magnet polarity by observing the direction of the rotor rotation during the test pulses. 1. A method for identifying the angle and polarity of the rotor of a permanent magnet synchronous motor (PMSM) , controlled by a frequency converter , the motor comprising a stator , including windings and a rotor comprising at least two permanent magnets , wherein the method comprises:determining the rotor d-axis direction by supplying stator voltage vector pulses to the motor terminals at at least two different angles, measuring the phase current at each angle, and determining the rotor d-axis direction based on motor inductance values in each stator angle, which inductance values have been calculated from the measured values, anddetermining the rotor d-axis polarity by supplying a torque producing current vector to the motor terminals at the q-axis direction, and determining the magnet polarity by observing the direction of the rotor rotation during the test pulses.2. A method according to wherein stator voltage vector pulses for determining the rotor d-axis direction are AC voltage.3. A method according to wherein stator voltage vector pulses for determining the rotor d-axis direction are DC voltage pulses.4. A method according to wherein the polarity determination ...

Method and Device for Controlling a Synchronous Machine Without a Position Sensor By Means of One-to-One Assignment of the Admittance or Inductance to the Rotor Position

A method and a device for assigning the inductance or admittance to the rotor position of a synchronous machine having a stator and a rotor with or without permanent magnets. In operation, the synchronous machine is activated by way of timed terminal voltages and the inductance or admittance is calculated from the terminal voltages and the measured current response. In this case, the variation of the inductance or admittance over the rotor rotation under the boundary condition of an at least two-dimensional current vector that is unchanged in stator coordinates, is used as key information for the positional assignment. 1. A method for assigning an inductance or an admittance to a rotor position of a synchronous machine having a stator and a rotor with or without permanent magnets , the method comprising:actuating the synchronous machine via clocked terminal voltages;measuring electric current of the synchronous machine responsive to the synchronous machine being actuated via the clocked terminal voltages;determining an inductance or an admittance from each pair of clocked terminal voltage and measured current response; andusing a pattern of the inductance or the admittance as a function of rotation of the rotor, under a boundary condition of an at least two-dimensional electric current vector that is unchanged in coordinates of the stator, to assign respective inductances or admittances to positions of the rotor.2. The method of further comprising:storing multiple patterns of the inductance or the admittance as a function of rotation of the rotor in a model for various stator-fixed electric current values in each case, from which an instantaneously valid pattern or parameter set is selected, according to the measured current response, by which a position value of the rotor is assigned to the inductance or admittance.3. The method of wherein:each inductance or admittance assigned to a position of the rotor is described by three values, one of the three values ...

MOTOR CONTROL APPARATUS THAT CONTROLS MOTOR, BASED ON COMMAND VALUES OF EXCITATION CURRENT AND OF TORQUE CURRENT, AND IMAGE FORMING APPARATUS

A motor control apparatus includes: a current supply unit configured to supply coil current to a plurality of coils of a motor by controlling, based on a first command value of excitation current and a second command value of torque current, voltage to be applied to the plurality of coils; a first setting unit configured to set the first command value; a second setting unit configured to set the second command value; and a control unit configured to use first control in starting of rotation of a rotor of the motor, and switch control to second control after rotation speed of the rotor becomes greater than predetermined speed. The first setting unit is further configured to set a value greater than 0 as the first command value before the control unit switches control from the first control to the second control. 1. A motor control apparatus comprising:a current supply unit configured to supply coil current to a plurality of coils of a motor by controlling, based on a first command value of excitation current and a second command value of torque current, voltage to be applied to the plurality of coils;a first setting unit configured to set the first command value;a second setting unit configured to set the second command value; anda control unit configured to use first control in starting of rotation of a rotor of the motor, and switch control to second control after rotation speed of the rotor becomes greater than predetermined speed, whereinthe first setting unit is further configured to set a value greater than 0 as the first command value before the control unit switches control from the first control to the second control.2. The motor control apparatus according to claim 1 , wherein the first setting unit is further configured to set a value greater than 0 as the first command value before the control unit starts the first control.3. The motor control apparatus according to claim 1 , wherein the first setting unit is further configured to set 0 as the first ...

CONTROLLER FOR PERMANENT MAGNET SYNCHRONOUS MOTOR, AND CONTROL METHOD FOR ESTIMATING INITIAL POSITION OF ROTOR

A controller for a sensorless permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field, caused by a current flowing through an armature is provided. The controller is configured to apply a pulse voltage for generating a magnetic field vector for searching for the initial position to each of search sections obtained by dividing a target range, narrow down a target range in such a manner that a search section in which a largest amount of current flows through the armature by application of the pulse voltage is selected as a subsequent target range, and repeat the application processing and the narrow-down processing to estimate the initial position. 1. A controller for a sensorless permanent magnet synchronous motor having a rotor using a permanent magnet , the rotor rotating by a rotating magnetic field caused by a current flowing through an armature , the controller comprising:a drive portion configured to apply a voltage to the armature to drive the rotor;an initial position estimating portion configured to estimate an initial position which is a position of magnetic poles of the rotor which is in a stop state; anda control unit configured to control the drive portion; wherein.the initial position estimating portion gives instructions to the control unit to apply a pulse voltage for generating a magnetic field vector for searching for the initial position to each of search sections obtained by dividing a target range narrows down a target range in such a manner that a search section in which a largest amount of current flows through the armature by application of the pulse voltage is selected as a subsequent target range, and estimates the initial position.2. The controller for the sensorless permanent magnet synchronous motor according to claim 1 , wherein the initial position estimating portion gives instructions to the control unit to apply a pulse voltage so that claim 1 , in narrowing down the ...

ADJUSTABLE PULSE INJECTION IN ELECTRIC MACHINE CONTROL

A control system is provided for an electric machine having a rotor and a stator. The control system has a converter circuit in electrical communication with the stator and a controller in electrical communication with the converter circuit. The controller is configured to receive a first signal indicating a torque applied to or output by the rotor and receive a second signal indicating a rotational speed of the rotor. The controller is also configured to determine at least one characteristic of a pulse signal based on at least one of the first or second signal. The controller is also configured to inject the pulse signal into one or more phases of the stator via the converter circuit according to the determined at least one characteristic. The controller is also configured to determine a position of the rotor based on the injected pulse signal. 1. A control system for an electric machine having a rotor and a stator , the control system comprising:a converter circuit in electrical communication with the stator of the electric machine, the stator including a plurality of phase windings each associated with a separate phase of the stator; and a measurement module configured to measure a phase current passing through each of the phase windings of the stator;', receive a signal from the measurement module indicative of a phase current in a phase winding of the stator;', 'receive rotor position feedback data from a feedback loop;', 'receive a first signal from a torque control module indicating a torque applied to or output by the rotor of the electric machine;', 'receive a second signal from one of a speed control module or a feedback loop indicating a rotational speed of the rotor of the electric machine;', 'determine at least one characteristic of a pulse signal for use in estimating a position of the rotor, the at least one characteristic being based on at least one of the first or second signal;', 'generate the pulse signal including a plurality of high frequency ...

ROTOR POSITION SENSING SYSTEM FOR PERMANENT MAGNET SYNCHRONOUS MOTORS AND RELATED METHODS

Implementations of a system for sensing rotor position of a PMSM may include: a controller which may be coupled with the PMSM. The controller may be configured to apply a plurality of voltage vectors to the PMSM to generate a plurality of sensing signals from a stator of the PMSM in response. A comparator may be coupled to the PMSM configured to receive and to compare each one of the plurality of sensing signals with a threshold voltage. A rise time measurement circuit may calculate a plurality of rise times using the plurality of sensing signals in response to receiving a signal from the comparator. The rotor-angle estimation circuit may be configured to identify from the plurality of rise times a shortest rise time and a voltage vector corresponding with the shortest rise time and thereby identify the position of the rotor of the PMSM. 1. A system for sensing rotor position of a permanent magnet synchronous motor , comprising:a controller configured to couple with a permanent magnet synchronous motor (PMSM), wherein the controller is configured to apply a plurality of voltage vectors to a PMSM to generate a plurality of sensing signals from a stator of the PMSM in response;a rise time measurement circuit configured to couple to the PMSM, wherein the rise time measurement circuit is configured to calculate a plurality of rise times using the plurality of sensing signals;a memory coupled with the rise time measurement circuit, wherein the memory is configured to store the plurality of rise times; anda rotor-angle estimation circuit coupled with the memory, wherein the rotor-angle estimation circuit is configured to calculate a rotor position relative to the stator of the PMSM through identifying one of a lowest average rise time, a lowest summed rise time, and a lowest weighted summed rise time using the plurality of rise times.2. The system of claim 1 , further comprising an amplifier coupled to the resistor claim 1 , wherein the amplifier is configured to receive ...

MOTOR CONTROL APPARATUS THAT PERFORMS PROCESSING FOR DETECTING STOP POSITION OF ROTOR, AND IMAGE FORMING APPARATUS

A motor control apparatus, includes: a voltage control unit configured to control a voltage to apply to a plurality of coils in order to cause a rotor of a motor that includes the plurality of coils to rotate; a holding unit configured to hold information that indicates a magnitude of a load of the motor; and a detection unit configured to, based on the information that indicates the magnitude of the load that is held by the holding unit, set a detection condition for a stop position of the rotor, and perform detection processing of the stop position of the rotor in accordance with the set detection condition. 1. A motor control apparatus , comprising:a voltage control unit configured to control a voltage to apply to a plurality of coils in order to cause a rotor of a motor that includes the plurality of coils to rotate;a holding unit configured to hold information that indicates a magnitude of a load of the motor; anda detection unit configured to, based on the information that indicates the magnitude of the load that is held by the holding unit, set a detection condition for a stop position of the rotor, and perform detection processing of the stop position of the rotor in accordance with the set detection condition.2. The motor control apparatus according to claim 1 , further comprising: a load determination unit configured to claim 1 , based on an excitation current supplied to the plurality of coils when a rotation speed of the rotor is greater than a predetermined speed claim 1 , determine the magnitude of the load of the motor claim 1 , and store information indicating the determined magnitude of the load of the motor in the holding unit.3. The motor control apparatus according to claim 1 , wherein the detection unit is further configured to detect the stop position of the rotor based on a physical quantity for each of excitation phases that are detected in the detection processing by causing the voltage control unit to apply the voltage so that an excitation ...

METHOD AND SYSTEM FOR CRANKING AN INTERNAL COMBUSTION ENGINE

The invention relates to a method for cranking an internal combustion engine, including the steps of: (a) receiving a start signal; (b) determining an initial position of the rotor with respect to a stator phase winding; (c) applying a pulse-width-modulated signal to the stator winding corresponding to determined initial position of the rotor; (d) determining a threshold value of the stator current variation; (e) measuring current of the stator winding in response to applied pulse-width-modulated signal to determine current variation; (f) if current variation is more than the threshold value, determining updated rotor position, applying a pulse-width-modulated signal to the stator winding corresponding to the updated rotor position; and repeating steps (d)-(f); and (g) if current variation is less than the threshold value, applying a pulse-width-modulated signal to the stator winding corresponding to the last updated rotor position and repeating steps (d)-(g). 1. A method for cranking an internal combustion engine , the engine coupled to a permanent magnet machine comprising a rotor having a plurality of permanent magnets poles , and a stator having a plurality of phase windings disposed on the stator , each phase winding including a plurality of coils , the method comprising the steps of:(a) receiving a start signal;(b) determining an initial position of the rotor with respect to a stator phase winding;(c) applying a pulse-width-modulated (PWM) signal to the stator winding corresponding to determined initial position of the rotor;(d) determining a threshold value of the stator current variation;(e) measuring current of the stator winding in response to applied pulse-width-modulated signal to determine current variation;(f) if current variation is more than the threshold value: determining updated rotor position, applying a pulse-width-modulated signal to the stator winding corresponding to the updated rotor position; and repeating steps (d)-(f); and(g) if current ...

MOTOR DRIVING CONTROL DEVICE AND CONTROL METHOD OF MOTOR DRIVING CONTROL DEVICE

A motor driving control device comprises: an induced voltage detecting unit configured to detect an induced voltage of a motor; a controller for generating a PWM signal corresponding to an energization timing of the motor; and an inverter circuit for outputting a driving signal for driving the motor to the motor based on the PWM signal generated by the controller, wherein the controller comprises: a position detecting unit configured to detect a position detection signal containing a rising or falling edge representing a timing at which a position of a rotor is a predetermined position; measuring unit configured to measure a zero-cross point of the induced voltage of the motor based on a detected timing of the edge of the position detection signal, and stopping output of the driving signal only for a predetermined period containing the zero-cross point of the induced voltage of the motor to measure a pulse width of a regenerated voltage of the motor in the period; a calculating unit configured to calculate a zero-cross point of coil current of the motor based on a measurement result of the measuring unit; and adjusting unit for adjusting the energization timing of the motor based on a calculation result of the calculating unit, the predetermined period being a period of one cycle of the PWM signal. 1. A motor driving control device comprising:an induced voltage detecting unit configured to detect an induced voltage of a motor;a controller for generating a PWM signal corresponding to an energization timing of the motor; andan inverter circuit for outputting a driving signal for driving the motor to the motor based on the PWM signal generated by the controller, wherein the controller comprises:a position detecting unit configured to detect a position detection signal containing a rising or falling edge representing a timing at which a position of a rotor is a predetermined position;a measuring unit configured to measure a zero-cross point of the induced voltage of the ...

Method of Detecting the Position of an Electric Motor, Corresponding System and Motor

In an embodiment, a method for detecting the angular position of the rotor of an electric motor includes an inductive-sense procedure implemented by applying to the windings of the electric motor a time sequence of position-detection pulse signals, detecting a corresponding time sequence of response signals, integrating the response signals, and recording respective times taken by the response signals to reach an integral reference threshold. The position of the rotor is detected as a function of the respective times. The integral reference threshold is established by fixing a peak value, applying to the windings a calibration pulse, detecting the corresponding response signal and determining the time taken to reach the peak value. The integral reference threshold is selected as the integral of the response signal. 1. A method comprising:applying a time sequence of position-detection pulses to windings of an electric motor that comprises a rotor;detecting a corresponding time sequence of response signals;integrating the response signals in the corresponding time sequence of response signals;recording respective times taken by the response signals to reach an integral reference threshold;detecting a position of the rotor of the electric motor as a function of the respective times recorded; and setting a peak value;', 'applying a calibration pulse to the windings of the electric motor;', 'detecting a calibration response signal in response to the calibration pulse;', 'integrating the calibration response signal over a time taken by the calibration response signal to reach the peak value to generate an integral calibration value; and', 'selecting the integral reference threshold based on the integral calibration value., 'establishing the integral reference threshold by2. The method of claim 1 , wherein the calibration pulse is a pulse of the time sequence of position-detection pulses claim 1 , and wherein the integral reference threshold is the integral calibration ...

DRIVE SYSTEM AND INVERTER

A drive system of an embodiment includes an inverter for driving an electric motor; a detector that detects an electric current value output from the inverter; command generators that generate an electric current command value corresponding to an electric current to be supplied to the electric motor and a gate command of the inverter so that the electric current command value matches the electric current value; calculators that calculate an voltage target vector of the inverter and a rotation phase estimation value of the electric motor based on the electric current value and the voltage target vector, in an initial estimation of when activating the inverter. The electric current command value in the initial estimation is a value to supply an electric current for magnetically saturating a rotor of the electric motor, and a dynamic inductance of the electric motor used for calculating the rotation phase estimation value is a value of when the rotor of the electric motor is magnetically saturated. 1. A drive system comprising:an electric motor;an inverter main circuit that outputs an alternating electric current for driving the electric motor;an electric current detector that detects an electric current value of the alternating electric current output from the inverter main circuit;an electric current command generator that generates an electric current command value corresponding to an electric current to be supplied to the electric motor;a gate command generator that generates a gate command of the inverter main circuit so that the electric current command value matches the electric current value detected by the electric current detector;an output voltage target vector calculator that calculates an output. voltage target vector of the inverter main circuit based on the gate command; anda rotation phase estimator that calculates a rotation phase estimation value of the electric motor based on the electric current value detected by the electric current detector and ...

METHOD OF DETECTING THE ANGULAR POSITION OF AN ELECTRIC MOTOR, CORRESPONDING CIRCUIT AND ELECTRIC MOTOR

A method for detecting the angular position of an electric motor includes: applying a first drive signal with a first polarity between first and second drive terminals that are coupled to respective stator windings of the electric motor; sensing at a third drive terminal a first signal resulting from the application of the first drive signal; applying a second drive signal with a second polarity between the first and second drive terminals, the second polarity being opposite the first polarity; sensing at the third drive terminal a second signal resulting from the application of the second drive signal; and producing a sum signal by summing the first and second signals, wherein the sum signal is indicative of an angular position of a rotor of the electric motor with respect to the stator windings. 1. A method comprising:a) applying a first drive signal with a first polarity between a first and a second drive terminals of a set of drive terminals, wherein each drive terminal of the set of drive terminals is coupled to respective stator windings of an electric motor, and sensing, at a third drive terminal of the set of drive terminals, a first signal resulting from the application of the first drive signal;b) applying a second drive signal with a second polarity between the first drive terminal and the second drive terminal, wherein the second polarity is opposite the first polarity, and sensing, at the third drive terminal, a second signal resulting from the application of the second drive signal; andc) producing a sum signal by summing the first and second signals, wherein the sum signal is indicative of an angular position of a rotor of the electric motor with respect to the stator windings.2. The method of claim 1 , wherein:sensing the first signal comprises sensing the first signal during a first charge phase, wherein, during the first charge phase, a charge current flows between the first and second drive terminals as a result of the application of the first ...

METHOD FOR DETERMINING THE ROTATIONAL POSITION OF A ROTOR IN A PERMANENT MAGNET SYNCHRONOUS MACHINE

Provided is a method for determining the rotational position of a rotor in a permanent magnet synchronous machine, wherein the stator includes windings for a first, second and third phase, including the steps: applying a first voltage pulse to the first phase, determining respective first measures for the current induced by the first voltage pulse in the second and third phase, selecting a first selected phase depending on the first measures for the current, wherein the first selected phase is either the second or the third phase, applying a second voltage pulse to the first selected phase, determining respective second measures for the current induced by the second voltage pulse in the phases of the stator that are not the first selected phase, and determining the rotational position of the rotor depending on the second measures of the current. 1. A method for determining a rotational position of a rotor in a permanent magnet synchronous machine , wherein the stator comprises windings for a first phase , a second phase , and a third phase , the method comprising:applying a first voltage pulse to the first phase;determining respective first measures for a current induced by the first voltage pulse in the second phase and the third phase;selecting a first selected phase depending on the first measures for the current, wherein the first selected phase is either the second phase or the third phase,applying a second voltage pulse to the first selected phase;determining respective second measures for the current induced by the second voltage pulse in the first phase, the second phase, the third phase of the stator that are not the first selected phase; anddetermining the rotational position of the rotor depending on the second measures of the current.2. The method according to claim 1 , wherein the step of determining the rotational position of the rotor depending on the second measures of the current further comprising:selecting a second selected phase depending on the ...

ROTOR POSITION SENSING SYSTEM FOR PERMANENT MAGNET SYNCHRONOUS MOTORS AND RELATED METHODS

Implementations of a system for sensing rotor position of a PMSM may include: a controller which may be coupled with the PMSM. The controller may be configured to apply a plurality of voltage vectors to the PMSM to generate a plurality of sensing signals from a stator of the PMSM in response. A comparator may be coupled to the PMSM configured to receive and to compare each one of the plurality of sensing signals with a threshold voltage. A rise time measurement circuit may calculate a plurality of rise times using the plurality of sensing signals in response to receiving a signal from the comparator. The rotor-angle estimation circuit may be configured to identify from the plurality of rise times a shortest rise time and a voltage vector corresponding with the shortest rise time and thereby identify the position of the rotor of the PMSM. 1. A system for sensing rotor position of a permanent magnet synchronous motor , comprising:a controller configured to couple with a permanent magnet synchronous motor (PMSM), wherein the controller is configured to apply a plurality of voltage vectors to the PMSM to generate a plurality of sensing signals from a stator of the PMSM in response;a rise time measurement circuit configured to couple to the PMSM, wherein the rise time measurement circuit is configured to calculate a plurality of rise times using the plurality of sensing signals;a memory coupled with the rise time measurement circuit, wherein the memory is configured to store the plurality of rise times; anda rotor-angle estimation circuit coupled with the memory, wherein the rotor-angle estimation circuit is configured to calculate a rotor position relative to the stator of the PMSM using the plurality of rise times.2. The system of claim 1 , further comprising an amplifier coupled to a resistor claim 1 , wherein the amplifier is configured to receive and to amplify the plurality of sensing signals to form a plurality of amplified sensing signals.3. The system of claim 2 ...

METHOD FOR OPERATING AN ELECTRIC MACHINE, ELECTRIC MACHINE

The invention relates to a method for operating an electric machine (). The electric machine () is driven using field-oriented regulation, and a current relative position (θi) of a rotating field is detected by means of at least one sensor (). At least one electric voltage (Uαs, Uβs) is generated which causes an electric rotor flux corresponding to the position (θi) detected by the sensor, the electric machine () is monitored for a torque generated by the voltage (Uαs, Uβs) and an absolute position of the rotating field is determined depending on the generated torque. 12. A method for operating an electric machine () , that is operated via field-oriented control , the method comprising:{'b': '5', 'detecting an instantaneous relative position (θi) of a rotating field by means of at least one sensor (),'}generating at least one voltage (Uαs, Uβs) which induces an electric rotor flux corresponding to the position (θi) detected by the sensor,monitoring the electric machine for a torque generated by the voltage (Uαs, Uβs), anddetermining an absolute position of the rotating field as a function of the generated torque.22. The method as claimed in claim 1 , wherein at least one phase current (Iu claim 1 , Iv claim 1 , Iw) generated by the voltage (Uαs claim 1 , Uβs) is monitored and compared to a limit value claim 1 , wherein a friction torque of the electric machine () is surmounted if the phase current (Iu claim 1 , Iv claim 1 , Iw) exceeds the limit value.3. The method as claimed in claim 1 , wherein the voltage (Uαs claim 1 , Uβs) is adjusted in such a way that the at least one phase current (Iu claim 1 , Iv claim 1 , Iw) exceeds the limit value.4244. The method as claimed in claim 1 , wherein the electric machine () is operated by means of a rotating field controller () claim 1 , wherein a control difference which is set by the rotating field controller () is monitored claim 1 , and the absolute position is determined as a function of the control difference.5. The ...

Method for Controlling the Motor of a Synchronous Reluctance Motor for a Pump and Pump Comprising a Synchronous Reluctance Motor

A method and apparatus for controlling the motor of a synchronous reluctance motor for a pump, in particular a centrifugal pump, are provided. The motor includes a variable-frequency drive which controls the synchronous reluctance motor in a terminal volts/hertz operation. The pump, in particular a centrifugal pump, includes at least one synchronous reluctance motor and a variable-frequency drive for a motor control, the variable-frequency drive being a terminal volts/hertz variable-frequency drive. 111-. (canceled)12. A method for controlling the motor of a synchronous reluctance motor for a pump having a variable-frequency converter , comprising the acts of:controlling the synchronous reluctance motor using the variable-frequency converter in a volts/hertz operation.13. The method as claimed in claim 12 , whereinthe pump is centrifugal pump.14. The method as claimed in claim 12 , whereinthe volts/hertz variable-frequency converter operates in the open control circuit.15. A device as claimed in claim 14 , whereinthe motor is a synchronous reluctance motor, anda ratio of a voltage supplied to the synchronous reluctance motor to a frequency of the variable-frequency converter in the volts/hertz operation is predetermined based on the synchronous reluctance motor being controlled by the variable-frequency converter.16. The method as claimed claim 15 , whereinthe variable-frequency converter in the volts/hertz operation controls a rotational speed of the motor.the ratio of the voltage to the frequency varies with voltage in a static-quadratic relationship, andthe static-quadratic relationship includes in a fixed voltage-frequency relationship in a rotation speed range between zero speed and a predetermined low speed threshold, and a quadratic voltage-frequency relationship in a rotation speed range above the predetermined low speed threshold.17. The method as claimed in claim 16 , whereinin the act of controlling the synchronous reluctance motor using the variable- ...

METHOD FOR RELIABLE CONTROL OF HIGH ROTOR POLE SWITCHED RELUCTANCE MACHINE

A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; and estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position. 1. A method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system , the method comprising:providing an HRSRM with a rotor and a stator with plurality of stator phases each having a winding;energizing at least one of the plurality of stator phases at a stator phase energizing module;measuring a first current value through the at least one energized stator phase and time taken by the first current value to reach a first peak value or present magnitude of current at a first current and time measuring module, wherein each of the windings of the rest of the plurality of stator phases is in an open circuit state;determining a self-inductance value for the at least one energized stator phase;measuring a second current value through an adjacent un-energized stator phase and time taken by the adjacent un-energized stator phase to reach a second peak value of current at a second current and time measuring module, wherein the winding of the adjacent un-energized stator phase is in a short circuit state;determining a mutual inductance value between the at least one energized stator phase and the adjacent un-energized stator phase;estimating a rotor position utilizing a hybrid combination of ...

RELIABLE CONTROL OF HIGH ROTOR POLE SWITCHED RELUCTANCE MACHINE

A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; storing the self-inductance value and the first current value for each of the stator phases; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; storing the mutual inductance value and the second current value for each of the stator phases; 1. A sensorless reliable control system for a high rotor pole switched reluctance machine (HRSRM) having a rotor and a stator with a plurality of stator phases each having a winding , the reliable control system comprising:a stator phase energizing module to excite at least one of the plurality of stator phases, wherein each of the windings of the rest of the plurality of stator phases is in an open circuit state;a first current and time measuring module to measure a first current value through the at least one energized stator phase and time taken by the first current value to reach a first peak value of current;a self-inductance determining module to determine a self-inductance value for the at least one energized stator phase;a first storage module to store the self-inductance value and the first current value for each of the plurality of stator phases;a second current and time measuring module to measure a second current value through an adjacent un-energized stator phase and time taken by the adjacent un-energized stator phase to reach a second peak value of current, wherein the winding of the adjacent un-energized stator phase is in an open circuit state;a mutual-inductance determining module to determine a ...

DETERMINATION OF AN INTERRUPTED MOTOR PHASE OF AN ELECTRIC MOTOR

A method for determining an interrupted motor phase of an electric motor having at least three windings by means of a control unit is disclosed, wherein voltages induced in the windings are determined on outer conductors of the electric motor by means of at least one measuring unit, wherein the measuring unit is connected to at least one outer conductor of the electric motor via at least one resistor, the induced voltages of the outer conductors of the electric motor are compared with one another, and an interrupted motor phase is registered if the induced voltage differs or if a frequency of the induced voltage differs. A control unit, a computer program and a machine-readable storage medium are also disclosed. 1264. A method for determining an interrupted motor phase of an electric motor () having at least three windings () by a control unit () , the method comprising:{'b': 6', '2', '14', '14', '2, 'determining voltages induced in the windings () on outer conductors (U, V, W) of the electric motor () by at least one measuring unit (), wherein the measuring unit () is connected to at least one outer conductor (U, V, W) of the electric motor () via at least one resistor (R),'}{'b': '2', 'comparing the induced voltages of the outer conductors (U, V, W) of the electric motor () with one another, and'}registering an interrupted motor phase when the induced voltage differs or whena frequency of the induced voltage differs.22. The method according to claim 1 , wherein the electric motor () is at least temporarily deactivated or is operated with a reduced current if an interrupted motor phase (U claim 1 , V claim 1 , W) is registered.34141414. The method according to claim 1 , wherein the control unit () is in the form of at least one BEMF comparator () or in the form of an electric motor controller with at least one BEMF comparator () claim 1 , wherein the induced voltage is measured in the form of a signal from the BEMF comparator () and the determined signals of the ...

Sensorless Control of Switched Reluctance Machines

A control system for a switched reluctance (SR) machine having a rotor and a stator is provided. The control system may include a converter circuit in electrical communication between the stator and a common bus, and a controller configured to monitor a bus voltage of the converter circuit and a phase current of the SR machine. The controller may be configured to determine a phase voltage based on one or more of main pulses and any diagnostic pulses, determine an estimated flux based on the phase voltage and an associated mutual voltage, determine a rotor position based at least partially on the estimated flux, and control the SR machine based on the rotor position and a desired torque. 1. A control system for a switched reluctance (SR) machine having a rotor and a stator , comprising:a converter circuit in electrical communication between the stator and a common bus; anda controller configured to monitor a bus voltage of the converter circuit and a phase current of the SR machine, the controller having at least a phase voltage estimator module configured to determine a phase voltage based on one or more of main pulses and any diagnostic pulses, a flux estimator module configured to determine an estimated flux based on the phase voltage and an associated mutual voltage, a position observer module configured to determine a rotor position based at least partially on the estimated flux, and a main pulse control module configured to control the SR machine based on the rotor position and a desired torque.2. The control system of claim 1 , wherein the controller further includes a speed observer module configured to determine a rotor speed based at least partially on the estimated flux.3. The control system of claim 1 , wherein the phase voltage estimator module is configured to determine a phase voltage based on one or more of the main pulses during high speed operating modes and any of the diagnostic pulses during low speed operating modes.4. The control system of claim ...

MOTOR DRIVING CONTROL DEVICE AND MOTOR DRIVING CONTROL METHOD

There is provided a motor driving control device and a motor driving control method capable of quickly activating a motor. The motor driving control device comprises a motor driving unit, a control circuit unit and a position detector. The motor driving unit selectively energizes coils Lu, Lv, Lw of a plurality of phases of the motor. The control circuit unit outputs a driving control signal C to the motor driving unit to switch, in a predetermined order, an energization phase of the coils Lu, Lv, Lw of the plurality of phases to be energized by the motor driving unit. The position detector outputs a position signal corresponding to a position of a rotor of the motor. The control circuit unit adjusts the energization phase based on the position signal when the motor is activated, thereby matching variation timing of a phase of the position signal and the energization phase with each other, and outputs the driving control signal C according to a period of the position signal after the activation of the motor. 1. A motor driving control device comprising:a motor driving unit for selectively energizing coils of a plurality of phases of a motor;a control circuit unit for outputting a driving control signal to the motor driving unit to switch, in a predetermined order, an energization phase of the coils of the plurality of phases to be energized by the motor driving unit; anda position detector for outputting a position signal corresponding to a position of a rotor of the motor, whereinthe control circuit unit adjusts the energization phase based on the position signal when the motor is activated, thereby matching variation timing of a phase of the position signal and the energization phase with each other, and outputs the driving control signal according to a period of the position signal after the activation of the motor.2. The motor driving control device according to claim 1 , wherein when the motor is activated claim 1 , the control circuit unit quickly switches the ...

Motor control apparatus that performs failure determination and determination of rotational position of rotor, and image forming apparatus

A motor control apparatus includes: an excitation unit configured to excite a plurality of excitation phases of a motor; a measurement unit configured to measure a physical amount that changes according to an inductance of at least one of a plurality of coils that make up the plurality of excitation phases by exciting each of the plurality of excitation phases, and generate measured data that includes measurement values of the physical amount measured for the plurality of excitation phases; and a determination unit configured to determine, based on the measured data, a rotational position of a rotor of the motor and whether or not at least one of the motor and the excitation unit has a failure.

MOTOR CONTROL APPARATUS AND IMAGE FORMING APPARATUS

A motor control apparatus includes: an excitation unit configured to excite a plurality of excitation phases of a motor; a measurement unit configured to measure a physical amount that changes according to an inductance of a plurality of coils that make up the plurality of excitation phases when the plurality of excitation phases are excited; and a control unit configured to control the excitation unit to excite the plurality of excitation phases sequentially, determine a first excitation phase by comparing a measurement value measured by the measurement unit in excitation of each of the plurality of excitation phases with a first threshold, and determine that a rotational position of a rotor of the motor is a rotational position at which the rotor stops when the first excitation phase is excited. The first excitation phase is determined, the control unit stops excitation. 1. A motor control apparatus comprising:an excitation unit configured to excite a plurality of excitation phases of a motor;a measurement unit configured to measure a physical amount that changes according to an inductance of at least one of a plurality of coils that make up the plurality of excitation phases, when each of the plurality of excitation phases is excited; anda control unit configured to control the excitation unit so as to excite the plurality of excitation phases sequentially, determine a first excitation phase from among the plurality of excitation phases by comparing a measurement value measured by the measurement unit in excitation of each of the plurality of excitation phases with a first threshold, and determine that a rotational position of a rotor of the motor is a rotational position at which the rotor stops when the first excitation phase is excited,wherein, when the first excitation phase is determined, the control unit stops excitation of the plurality of excitation phases.2. The motor control apparatus according to claim 1 ,wherein the control unit excites the plurality ...

METHOD FOR RELIABLE CONTROL OF HIGH ROTOR POLE SWITCHED RELUCTANCE MACHINE

A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; and estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position. 1. A sensorless reliable control system for a high rotor pole switched reluctance machine (HRSRM) utilizing a hybrid combination of self-inductance and mutual inductance values , the reliable control system comprising:stator phase energizing module to excite at least one of a plurality of stator phases each having a winding, wherein each of the windings of the rest of the plurality of stator phases is in an open circuit state;a current and time measuring module to measure a current value through the at least one energized stator phase and time taken by the current value to reach a preset magnitude;a self-inductance determining module to determine a self-inductance value for the at least one energized stator phase;a storage module to store the self-inductance value and the current value for each of the plurality of stator phases;a voltage and time measuring module to measure a voltage value and time to voltage across an adjacent unenergized stator phase;a mutual-inductance determining module to determine a mutual inductance value between the at least one energized stator phase and the adjacent un-energized stator phase;a rotor position estimation module to estimate a rotor position utilizing a combination of the stored self-inductance and mutual ...

Drive Device and Method for Three-Phase Brushless Motor

Before sensorless control is performed on a three-phase brushless motor by sequentially switching between six energization modes each for selecting two phases to be energized from the three phases, the initial position of the rotor is estimated based on a change in a second induced voltage by: momentarily energizing the three-phase brushless motor according to each of the six energization modes, and detecting six first induced voltages each generated in a non-energized phase by the energization; calculating three induced voltage differences corresponding respectively to three non-energized phases, each induced voltage difference being a difference between two of the six first induced voltages that are detected during energization according to two energization modes that share a non-energized phase; and energizing the three-phase brushless motor according a predetermined energization mode selected based on the three induced voltage differences, and detecting the second induced voltage generated in a non-energized phase by the energization. 1. A drive device for a three-phase brushless motor , the drive device comprising:a drive circuit for driving the three-phase brushless motor; anda controller for outputting a control signal to the drive circuit so as to perform sensorless control by sequentially switching between six energization modes each for selecting two phases to be energized from three phases of the three-phase brushless motor, whereinbefore performing the sensorless control,the controller outputs, to the drive circuit, the control signal for momentarily energizing the three-phase brushless motor according to each of the six energization modes, and detects six first induced voltages each generated in a non-energized phase by the energization, and calculates three induced voltage differences corresponding respectively to three non-energized phases, each induced voltage difference being a difference between two of the six first induced voltages that are ...

SYSTEMS AND METHODS FOR ROTOR POSITION DETERMINATION

Various embodiments are described herein for a system and method to eliminate mutual flux effect on rotor position estimation of switched reluctance motor (SRM) drives at rotating shaft conditions without a prior knowledge of mutual flux. Neglecting the magnetic saturation, the operation of conventional self-inductance estimation using phase current slope difference method can be classified into three modes: Mode I, II and III. At positive-current-slope and negative-current-slope sampling point of one phase, the sign of current slope of the other phase changes in Mode I and II, but does not change in Mode III. In one example embodiment, in order to operate the self-inductance estimation in Mode III, a variable-hysteresis-band current control method is proposed for the incoming phase and variable-sampling method is proposed for the outgoing phase. 1. A switched reluctance motor system comprising:a multi-phase switched reluctance motor; anda controller coupled to the multi-phase switched reluctance motor, the controller configured to operate the multi-phase switched reluctance motor in an error reduction mode,wherein when a positive slope of a phase current corresponding to a first phase of the multi-phase switched reluctance motor is sampled at a first sample time and when a negative slope of the phase current corresponding to the first phase of the multi-phase switched reluctance motor is sampled at a second sample time,the slopes of a phase current corresponding to a second phase of the multi-phase switched reluctance motor have the same sign at the first sample time and the second sample time.2. The switched reluctance motor system of claim 1 , wherein in the error reduction mode claim 1 , error corresponding to self-inductance estimation of the first phase due to mutual flux from the second phase is reduced.3. The switched reluctance motor system of claim 1 , wherein:if the first phase of the multi-phase switched reluctance motor is an incoming phase, the ...

FOUR-PHASE SWITCHED RELUCTANCE MOTOR TORQUE RIPPLE TWO-LEVEL SUPPRESSION METHOD

A four-phase switched reluctance motor torque ripple two-level suppression method. A first set of torque thresholds is set in rotor position interval [0°, θr/4]. A second set of torque thresholds is set in rotor position interval [θr/4, θr/2]. Power is supplied to adjacent phase A and phase B for excitation. The power supplied for excitation to phase A leads the power supplied for excitation to phase B by θr/4. An entire commutation process from phase A to phase B is divided into two intervals. In rotor position interval [0°, θ1], phase A uses the second set of torque thresholds while phase B uses the first set of torque thresholds. Critical position θ1 automatically appears in the commutation process, thus obviating the need for additional calculations. Total torque is controlled between [Te+th2low and Te+th2up]. In rotor position interval [θ1, θr/4], phase A continues to use the second set of torque thresholds, phase B continues to use the first set of torque thresholds, and the total torque is controlled between [Te+th1low and Te+th1up]. This suppresses torque ripples of a four-phase switched reluctance motor and provides great engineering application values.

MONITORING DEVICE FOR A RELUCTANCE MACHINE AND METHOD FOR MONITORING

A monitoring device for a reluctance machine includes a vector rotator for rotating a space phasor of the reluctance machine that depends on a voltage in a coordinate system that rotates with a negative fundamental frequency, a low-pass filter filtering the rotated space phasor and producing an output signal, and a signal evaluation device evaluating the output signal. A DC value of the produced output signal in the rotating coordinate system is monitored, and an error in operating the reluctance machine is identified when the DC value is above a predefined threshold value. 18.-. (canceled)9. A monitoring device for a reluctance machine , comprising:a vector rotator for rotating a space phasor of the reluctance machine that depends on a voltage in a coordinate system that rotates with a negative fundamental frequency,a low-pass filter filtering the rotated space phasor and producing an output signal, anda signal evaluation device evaluating the output signal.10. The monitoring device of claim 9 , wherein the space phasor is a voltage phasor.11. The monitoring device of claim 9 , wherein the signal evaluation device comprises an absolute-value generator and a threshold comparator.12. A method for monitoring a reluctance machine claim 9 , comprising:transforming a space phasor for a flux that depends on a voltage, into a coordinate system that rotates with a negative fundamental frequency;producing an output signal by low-pass-filtering the transformed space phasor;monitoring a DC value of the produced output signal in the rotating coordinate system; andidentifying an error in operating the reluctance machine when the DC value is above a predefined threshold value.13. The method of claim 12 , further comprising generating the DC value of the produced output signal with a low-pass filter.14. The method of claim 12 , wherein the reluctance machine is operated without an encoder.15. The method of claim 12 , wherein the reluctance machine is operated with open-loop ...

ELECTRIC MACHINE

In a method for operating an electric machine a first test signal is fed into the electric machine and a first response signal of the electric machine is measured. A first state variable for a rotor of a synchronous reluctance motor of the electric machine is determined as a function of the first response signal, and a second state variable for the rotor of the synchronous reluctance motor is determined. The first state variable and the second state variable are evaluated together. 115.-. (canceled)16. A method for operating an electric machine in the form of a synchronous reluctance motor , said method comprising:feeding a first test signal into the electric machine;measuring a first response signal of the electric machine;determining a first state variable for a rotor of the synchronous reluctance motor as a function of the first test signal;determining a second state variable for the rotor of the synchronous reluctance motor; andevaluating the first state variable and the second state variable together.17. The method of claim 16 , further comprising:feeding a second test signal into the electric machine to determine the second state variable;measuring a second response signal; anddetermining the second state variable as a function of the second response signal.18. The method of claim 17 , wherein at least one of the first test signal and the second test signal is an overlaid signal.19. The method of claim 17 , wherein at least one of the first test signal and the second test signal is a signal fixed to the rotor or a signal fixed to a stator of the synchronous reluctance motor.20. The method of claim 17 , wherein the first test signal and the second test signal are used to determine a same state of the rotor.21. The method of claim 17 , wherein the first test signal is orthogonal to the second test signal.22. The method of claim 20 , wherein the state is a position claim 20 , a speed or an acceleration.23. The method of claim 17 , wherein at least one of the ...

ENHANCED INDUCTIVE SENSE USING MUTUAL INDUCTANCE

Methods and apparatus for determining rotor position in a motor including a rotor and stator windings. The method includes measuring inductive sense values for each pair of the stator windings by performing an inductive sense routine on the motor, measuring stator winding voltage values, induced by mutual inductance between windings, for each of the stator windings by performing a mutual inductance sensing routine on the motor, and determining the rotor position based on the inductive sense values and the stator winding voltage values. 1. A method for determining rotor position in a motor including a rotor and stator windings , comprising:measuring inductive sense values for each pair of the stator windings by performing an inductive sense routine on the motor;measuring stator winding voltage values, induced by mutual inductance between windings, for each of the stator windings by performing a mutual inductance sensing routine on the motor; anddetermining the rotor position based on the inductive sense values and the stator winding voltage values.2. A method for determining rotor position as defined in claim 1 , wherein measuring inductive sense values comprises determining a time for a current through each pair of the stator windings to reach a current limit.3. A method for determining rotor position as defined in claim 1 , wherein measuring stator winding voltage values comprises determining if a winding voltage is positive or negative when a current is supplied through two other stator windings.4. A method for determining rotor position as defined in claim 1 , wherein determining the rotor position comprises accessing an entry in a table based on the inductive sense values and the stator winding voltage values.5. A method for determining rotor position as defined in claim 1 , wherein the motor includes three stator windings and wherein measuring inductive sense values includes measuring six inductive sense values.6. A method for determining rotor position as ...

METHOD AND CIRCUIT ARRANGEMENT FOR DETERMINING THE POSITION OF A ROTOR IN AN ELECTRIC MOTOR

A circuit, comprising a plurality of phase windings in an electric motor, an inverter configured to excite the phase windings by a sequence of voltage pulses including a plurality of successive voltage pulses that a current can be set in each of the phase windings, wherein the voltage pulses are selected in such a manner that a positive and a negative current are produced in all the phase windings during the voltage pulses, a current sensor for measuring a peak value for the current being set during a duration of each voltage pulse in each phase winding, and an evaluation circuit connected to the current sensor, wherein the evaluation circuit is configured to determine the voltage pulse in the voltage pulse sequence during a duration of which peak current value having a greatest magnitude was measured. 1. A method for determining position of a camshaft adjuster or the position of a device for changing a compression ratio of an internal combustion engine having a brushless permanent-magnet electric motor having a rotor and a stator which include a plurality of phase windings , comprising:exciting the plurality of phase windings via a sequence of voltage pulses;providing a plurality of successive voltage pulses, such that a current is set successively in each of the phase windings;selecting voltage pulses such that a positive and a negative current is produced in all the phase windings during the voltage pulse sequence;measuring a peak value for the current being set in the respective phase winding during a duration of each voltage pulse using a common current sensor; anddetermining the voltage pulse in the voltage pulse sequence during the duration when the peak current value having the greatest magnitude was measured.2. The method according to claim 1 , wherein the voltage pulse determined during the duration of which the peak current value having a second greatest magnitude was measured.3. The method of claim 1 , wherein the voltage pulses of the voltage pulse ...

MOTOR CONTROL APPARATUS

A motor control apparatus drives an inverter which supplies and receives electric power with respect to a motor by pulse width modulation. The motor control apparatus sets a frequency of a carrier such that a frequency of a sideband wave component of the carrier which is used for the pulse width modulation and a frequency of a predetermined rotation order of the motor become different from each other. 1. A motor control apparatus that drives an inverter which supplies and receives electric power with respect to a motor by pulse width modulation , the motor control apparatus comprisinga carrier frequency setting part that sets a frequency of a carrier such that a frequency of a sideband wave component of the carrier which is used for the pulse width modulation and a frequency of a predetermined rotation order of the motor become different from each other.2. The motor control apparatus according to claim 1 ,wherein the predetermined rotation order is a rotation order at which a torque ripple occurs at the motor in accordance with a number of magnetic poles and a number of slots of the motor.3. The motor control apparatus according to claim 1 ,wherein the carrier frequency setting part sets, in a state where the frequency of the carrier is changed synchronously with a rotation number of the motor, the frequency of the carrier such that the frequency of the sideband wave component and the frequency of the predetermined rotation order become different from each other.4. The motor control apparatus according to claim 2 ,wherein the carrier frequency setting part sets, in a state where the frequency of the carrier is changed synchronously with a rotation number of the motor, the frequency of the carrier such that the frequency of the sideband wave component and the frequency of the predetermined rotation order become different from each other. Priority is claimed on Japanese Patent Application No. 2018-041252, filed on Mar. 7, 2018, the contents of which are incorporated ...

Improvements Relating to Electrical Power Assisted Steering Systems

An electric power assisted steering system comprises a motor adapted to apply an assistance torque to a portion of a steering shaft in response to a motor drive signal from a drive circuit, in which the motor comprises a synchronous wound field motor of the kind comprising a stator and a rotor, in which the rotor includes at least one pole and at least one coil winding associated with the pole and the stator comprises a number of phase windings, and in which the drive circuit which is configured to provide current in the coils of the stator and rotor during operation of the motor.

MOTOR DRIVE DEVICE AND ELECTRIC COMPRESSOR

A motor drive device drives a multi-phase synchronous motor in an electric compressor. The multi-phase synchronous motor includes a rotor that is provided with a permanent magnet and a stator having coils of different phases. The motor drive device includes an inverter that supplies current to the coils and a control unit that controls the inverter. The control unit executes an initial angular position calculation processing of detecting a d-axis and a q-axis as an initial angular position of the rotor, a rotating processing of rotating the d-axis and the q-axis in a direction opposite to rotation of the rotor, an acceleration processing of accelerating the rotation of the rotor, and a sensorless control processing of controlling the rotation of the rotor. 1. A motor drive device that drives a multi-phase synchronous motor in an electric compressor , the multi-phase synchronous motor including a rotor having a permanent magnet and a stator having coils of different phases , the motor drive device comprising:an inverter that supplies current to the coils; anda control unit that controls the inverter, whereinthe control unit executes:an initial angular position calculation processing including detecting a d-axis and a q-axis of the rotor as an initial angular position of the rotor based on a current flowing in response to a voltage pulse applied to the coils of the stator;a rotating processing including rotating the d-axis and the q-axis of the rotor by a predetermined angle θa in a direction opposite to rotation of the rotor;an acceleration processing including accelerating the rotation of the rotor by rotating the rotated d-axis and the rotated q-axis in the rotating direction of the rotor and flowing through the stator the torque component current determined based on a d-axis and a q-axis; anda sensorless control processing including controlling the rotation of the rotor based on an angular position and a speed of the rotor estimated based on the voltage applied to ...

METHOD FOR DETERMINING ROTOR POSITION OF ELECTRIC MOTOR, ELEVATOR AND ELECTRICAL CONVERTER UNIT

A method for determining a rotor position of an electric motor, an elevator and an electrical converter unit are presented. The method comprises supplying a first excitation signal to the electric motor, determining a first response signal generated in the motor in response to the first excitation signal, determining, based on the first response signal, an electrical angle of a direct axis of the motor with respect to a stationary reference frame, supplying a second excitation signal to the motor, wherein the second excitation signal is based on the determined electrical angle, determining a second response signal generated in the motor in response to the second excitation signal, and determining the rotor position based on the second response signal. 2. The method according to claim 1 , whereinthe first excitation signal is a first alternating voltage signal, such as having a constant amplitude, and the first response signal is a first response current generated in response to the first alternating voltage signal, or/andthe second excitation signal is a second alternating voltage signal, such as having a constant amplitude, and the second response signal is a second response current generated in response to the second alternating voltage signal.3. The method according to claim 1 , whereinthe first excitation signal is a first alternating current signal, such as having a constant amplitude, and the first response signal is a first response voltage generated in response to the first alternating current signal, or/andthe second excitation signal is a second alternating current signal, such as having a constant amplitude, and the second response signal is a second response voltage generated in response to the second alternating current signal.4. The method according to claim 1 , comprising claim 1 , prior to said supplying the first excitation signal claim 1 , applying a force having a first amount for maintaining a rotor of the motor in its position at least during ...

METHOD AND APPARATUS FOR CONTROL OF SWITCHED RELUCTANCE MOTORS

A method of controlling a switched reluctance motor is disclosed herein. The motor comprises a stator carrying a plurality of phase windings and a rotor. The method comprises activating the phase windings in a sequence selected to apply torque to the rotor, wherein during a cycle of rotation of the rotor the phase windings switch between an active state in which current in the phase winding applies torque to the rotor and an inactive state; applying a voltage to a selected phase winding whilst the selected phase winding is in the inactive state to provide a flux in the selected phase winding; determining the current in the selected phase winding; determining the rotor angle based on the current and the flux; and controlling said activating based on the rotor angle. 1. A method of controlling a switched reluctance motor , the motor comprising a stator carrying a plurality of phase windings and a rotor , the method comprising:activating the phase windings in a sequence selected to apply torque to the rotor, wherein during a cycle of rotation of the rotor the phase windings switch between an active state in which current in the phase winding applies torque to the rotor and an inactive state;applying a voltage to a selected phase winding whilst the selected phase winding is in the inactive state to provide a flux in the selected phase winding;determining the current in the selected phase winding;determining the rotor angle based on the current and the flux; andcontrolling said activating based on the rotor angle.2. The method of comprising determining the flux by integrating the voltage as a function of time.3. The method of or wherein determining the rotor angle comprises applying a flux mapping to the current and the flux.4. The method of wherein be flux mapping is selected based on the rotor speed and a torque demand signal.5. The method of or wherein the flux mapping comprises an association between rotor angle claim 3 , phase winding flux claim 3 , and phase ...

ELECTRIC WORKING MACHINE

An electric working machine includes an inverter and a controller. The controller switches a current conduction pattern via the inverter and performs a PWM control of a conduction current to a brushless motor. The controller includes switching patterns as the current conduction pattern switched for every commutation timing. The switching patterns include different on and off states for different switching elements. The controller sequentially switches a switching pattern synchronously with a period of the PWM control, detects a rotational position of a brushless motor from a magnitude relation between inductances of the brushless motor produced by switching the switching pattern, and sets the commutation timing. 1. An electric working machine including a brushless motor as a power source , the machine comprising:an inverter, anda controller,wherein the inverter includes switching elements separately disposed in conduction paths between a direct-current power source and terminals of the brushless motor,wherein the inverter is configured to control electric conduction to windings of the brushless motor and a direction of the electric conduction via the switching elements,wherein the controller is configured to perform a PWM control of a conduction current to the windings by switching a current conduction pattern to conduct electricity to the windings via the inverter for every given commutation timing of the brushless motor and by turning on and off the switching elements of the inverter in accordance with the current conduction pattern,wherein the controller includes switching patterns as the current conduction pattern switched for the every given commutation timing, the switching patterns including different on and off states for each of the switching elements, andwherein the controller is configured to sequentially switch a switching pattern for controlling on and off states of the switching elements to one of the switching patterns synchronously with a period of ...

CONTROLLER

A method for controlling a multiphase synchronous motor, for a motor flux vector includes setting a first winding of the motor to a floating state in which the first winding is electrically floating; setting a voltage across a second winding of the motor for a first period; receiving first voltage samples associated with the first winding in the first period; setting the voltage across the second winding to a second period, in which the first period and the second period are periods of one or more pulse width modulation cycles, in which a polarity of the voltage across the second winding in the second period is opposite to a polarity of the voltage across the second winding in the first period; receiving second voltage samples associated with the first winding in the second period; and determining a position of the rotor based on the first and second voltage samples. 1. A controller for a multiphase synchronous motor with a rotor and a plurality of phases for receiving a plurality of motor vectors , the controller comprising a controller circuit configured to , for a motor flux vector:set a first phase of the motor to a floating state in which the first phase is electrically floating;set a voltage across a second phase of the motor for a first period;receive first voltage samples associated with the first phase in the first period;set the voltage across the second phase of the motor for a second period, in which the first period and the second period are periods of one or more pulse width modulation cycles, in which a polarity of the voltage across the second phase in the second period is opposite to a polarity of the voltage across the second phase in the first period;receive second voltage samples associated with the first phase in the second period; anddetermine a position of the rotor based on the first and second voltage samples.2. The controller of claim 1 , in which the position of the rotor is determined based on a difference between the first voltage ...

Device for determining a position of a rotor of a polyphase electric motor

A device for determining a rotor position in a polyphase electric motor having a first phase, a second phase and a third phase. A power control unit applies a first voltage on the first phase, and a second voltage on the second phase, the first voltage and the second voltage being periodic signals of opposite polarity, alternating between a first part and a second part of the alternating period, such as square waves. A sample unit samples a third voltage on the third phase for acquiring a first sample at a first instant in the first part and a second sample at a second instant in the second part, and a difference value between the first sample and the second sample. The difference value represents a mutual inductance between the stator coils due to the rotor position. A determination unit determines the rotor position based on the difference value.

MOTOR CONTROL UNIT AND ELECTRIC POWER STEERING APPARATUS EQUIPPED WITH THE SAME

[Problem] 111-. (canceled)12. A motor control unit that calculates respective phase duties for a pulse width modulation (PWM)-control based on a current command value and controls a motor via an inverter configured with upper-stage and lower-stage field-effect transistor (FET) bridges , comprising:a current detector to detect respective phase currents of said motor;an upper-stage maximum heat generation-phase specifying means to calculate respective heat generation amounts of upper-stage FETs and specify an upper-stage maximum heat generation-phase;a lower-stage maximum heat generation-phase specifying means to calculate respective heat generation amounts of lower-stage FETs and specify a lower-stage maximum heat generation-phase;an upper-stage selecting means to select an upper-stage selecting duty and an upper-stage selecting phase current based on said upper-stage maximum heat generation-phase;a lower-stage selecting means to select a lower-stage selecting duty and a lower-stage selecting phase current based on said lower-stage maximum heat generation-phase;a duty operating amount calculating section to calculate a duty operating amount in order to distribute a heat generation which is concentrated in a specific FET to plural FETs based on said upper-stage selecting duty and said upper-stage selecting phase current, and said lower-stage selecting duty and said lower-stage selecting phase current; anda duty operating section to operate said respective phase duties so as to operate duties of all FETs with maintaining voltages between terminals of said respective phases based on said duty operating amount.13. The motor control unit according to claim 12 , wherein said upper-stage maximum heat generation phase specifying means comprises:an upper-stage FET-heat generation amount calculating section to calculate respective heat generation amounts of upper-stage FETs; andan upper-stage maximum heat generation-phase specifying section to specify said upper-stage maximum ...

A VARIABLE-FLUX MEMORY MOTOR AND METHODS OF CONTROLLING A VARIABLE-FLUX MOTOR

In one aspect, embodiments of the invention are directed to a multi-pole rotor of a variable-flux memory motor (VFMM) that includes: a rotor core; and a plurality of poles. Each of the poles includes: one or more soft rotor magnets; a first ferrous wedge; and a second ferrous wedge. The one or more soft rotor magnets are disposed between the first and second ferrous wedges in a circumferential direction of the rotor. 1. (canceled)2. A multi-pole rotor of a variable-flux memory motor (VFMM) , the rotor comprising:a rotor core; and one or more soft rotor magnets;', 'a first ferrous wedge; and', 'a second ferrous wedge, wherein, 'a plurality of poles, wherein each of the poles comprisesthe one or more soft rotor magnets are disposed between the first and second ferrous wedges in a circumferential direction of the rotor, andthe one or more soft rotor magnets comprise a combination of aluminum, nickel, and cobalt.319. The multi-pole rotor according to claim 2 , wherein the one or more soft rotor magnets are AlNiCo with one of the grades -.4. The multi-pole rotor according to claim 2 , wherein the rotor core is non-conductive.5. The multi-pole rotor according to claim 4 , wherein the rotor core is a polyamide-imide.6. (canceled)7. A multi-pole rotor according to of a variable-flux memory motor (VFMM) claim 1 , the rotor comprising:a rotor core; and one or more soft rotor magnets;', 'a first ferrous wedge; and', 'a second ferrous wedge, wherein, 'a plurality of poles, wherein each of the poles comprisesthe one or more soft rotor magnets are disposed between the first and second ferrous wedges in a circumferential direction of the rotor, andan absolute value of a slope of a magnetization direction in the one or more soft rotor magnets is equal to or more than 4.8. The multi-pole rotor according to claim 2 , further comprising a sleeve that keeps the one or more soft rotor magnets and the first and second ferrous wedges from disassociation from the rotor core.9. A variable- ...

DETERMINING MOTOR POSITION WITH COMPLEMENTARY DRIVING AND DETECTION AND CURRENT INJECTION

Methods and apparatus for determining a position of a rotor in motor, such as a three-phase motor by determining first and second ones of sectors in which a first one of the magnetic poles of the rotor may be positioned by driving phase pairs with complementary signals and examining a voltage of a floating one of the phases. Embodiments can further include driving first and second currents towards the first and second ones of the sectors and analyzing a time for each of the first and second currents to reach a threshold to identify which of the first and second ones of the sectors is aligned with the first one of the magnetic poles of the rotor. 1. A method of determining a position of a rotor in a three-phase motor having phase A , phase B , and phase C , comprising:determining first and second ones of sectors in which a first one of the magnetic poles of the rotor may be positioned, wherein the first and second ones of the sectors are oppositely located, by driving phase pairs A-B, A-C, and B-C with complementary signals and examining a voltage of a floating one of the phases; anddriving first and second currents towards the first and second ones of the sectors and analyzing a time for each of the first and second currents to reach a threshold to identify which of the first and second ones of the sectors is aligned with the first one of the magnetic poles of the rotor.2. The method according to claim 1 , wherein the time corresponds to a level of inductance saturation.3. The method according to claim 1 , wherein the motor comprises BLDC motor.4. The method according to claim 1 , wherein the sectors comprise twelve sectors.5. The method according to claim 1 , wherein the first and second ones of the sectors span about thirty degrees.6. The method according to claim 1 , further including driving phase pairs A-B claim 1 , A-C claim 1 , and B-C with complementary signals with about fifty percent duty cycles.7. The method according to claim 1 , wherein substantially ...

METHOD FOR DETERMINING A ROTOR FREQUENCY AND/OR A ROTOR ANGLE OF A ROTOR OF A RELUCTANCE MACHINE, CONTROL DEVICE, AND DRIVE ASSEMBLY

A method for determining a rotor frequency and/or a rotor angle of a rotor of a reluctance machine, in particular without an amortisseur, is disclosed. The reluctance machine has a stator with a stator winding and the rotor has a magnetically anisotropic rotor core. The method includes applying a temporal sequence of voltage pulses to the stator winding, determining a sequential pulse response of a current flowing in the stator winding, the current being generated as a result of the voltage pulses and a flux being generated from the voltage pulses as a result of the magnetically anisotropic rotor core, and determining the rotor frequency and/or the rotor angle based on the measured sequential pulse response of the electric current by using an evaluating device. 18.-. (canceled)9. A method , comprising:applying a temporal sequence of voltage pulses to a stator winding of a stator of a reluctance machine via a frequency converter by alternately outputting a voltage value of a fixed amount and a fixed direction and a pulse block in a sequential repetition; anddetermining a rotor frequency and/or a rotor angle of a rotor of the reluctance machine by measuring a sequential pulse response of an electric current by using an evaluating device, said electric current having a negative-phase component representing a part of the electric current changing as a function of the rotor angle and a positive-phase component representing a part of the electric current not undergoing a change as a function of the rotor angle, wherein the sequential pulse response of the electric current, which flows in the stator winding is generated as a result of the voltage pulses, and a flux is thereby sequentially generated from the voltage pulses as a result of the rotor having a magnetically anisotropic rotor core.10. The method of claim 9 , wherein the rotor frequency and/or the rotor angle is determined based on a geometry of the rotor core.11. The method of claim 9 , further comprising ...

Sensorless Control of Switched Reluctance Machines for Low Speeds and Standstill

A method for determining rotor position of a switched reluctance (SR) machine having a rotor and a stator is provided. The method may include injecting a test pulse into one or more idle phases of the SR machine, determining a decoupled flux value based at least partially on a total flux value corresponding to the test pulse and a mutual flux value, and determining the rotor position based at least partially on the decoupled flux value. 1. A method for determining rotor position of a switched reluctance (SR) machine having a rotor and a stator , comprising:injecting a test pulse into one or more idle phases of the SR machine;determining a decoupled flux value based at least partially on a total flux value corresponding to the test pulse and a mutual flux value; anddetermining the rotor position based at least partially on the decoupled flux value.2. The method of claim 1 , wherein the test pulse is configured to have a substantially constant current height.3. The method of claim 1 , wherein the test pulse is injected based at least partially on a measured phase current and rotor position feedback.4. The method of claim 1 , wherein the total flux value is determined based at least partially on a voltage integration of the test pulse.5. The method of claim 1 , wherein the mutual flux value is determined based on one or more predefined relationships between mutual flux values claim 1 , measured phase current values claim 1 , and rotor position feedback values.6. The method of claim 1 , wherein the decoupled flux value is determined based at least partially on a difference between the total flux value and the mutual flux value.7. The method of claim 1 , wherein the rotor position is determined based on one or more predefined relationships between decoupled flux values claim 1 , measured phase current values claim 1 , and rotor position values.8. The method of claim 1 , wherein the rotor position is used to further derive a speed and a direction of the rotor relative to ...

METHOD AND APPARATUS FOR QUASI-SENSORLESS ADAPTIVE CONTROL OF SWITCHED RELUCTANCE MOTOR DRIVES

A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched-reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched-reluctance motor, a load and a converter. 1. A method for controlling a high rotor pole switched-reluctance motor (HRSRM) , the method comprising the steps of:a) establishing a firm time base for a software control module on a magnetic sensor;b) updating the time base by generating a motor index pulse from the magnetic sensor;c) calculating a shaft speed of the motor and calibrating a software encoder to operate on the time base;d) canceling out a switching threshold of the magnetic sensor;e) monitoring slope of the current waveform of an active phase winding of the motor to fine-tune a firing angle from the encoder software;{'sub': 'on', 'f) adjusting a pulse time tbased on the estimated time base;'}g) monitoring the shaft speed to track any change in the shaft speed; andh) adjusting a dwell angle based on the shaft speed and the current.2. The method of wherein the rotor is aligned with respect to the initial position to start with a known phase.3. The method of wherein the initial position is estimated using a diagnostic pulse on an inactive phase winding during the initial rotation by estimating an inductance profile.4. The method of wherein the rotor produces the inductance profile in each of the stator ...

APPARATUS FOR QUASI-SENSORLESS ADAPTIVE CONTROL OF SWITCHED RELUCT ANGE MOTOR DRIVES

A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched-reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched-reluctance motor, a load and a converter. 1. A method for controlling a high rotor pole switched-reluctance motor (HRSRM) , the method comprising the steps of:a) estimating an initial position of the rotor of the HRSRM based on the relation between the phase inductances of the HRSRM;b) applying current to an active phase winding to rotate the motor;c) applying a voltage pulse to an inactive phase winding;d) measuring current response in the inactive phase;e) applying multiple diagnostic pulses to the inactive phase to identify the next phase;f) establishing a firm time base for a software control module on a magnetic sensor;g) updating the time base by generating a motor index pulse from the magnetic sensor;h) calculating a shaft speed of the motor and calibrating a software encoder to operate on the time base;i) canceling out a switching threshold of the magnetic sensor;j) monitoring slope of the current waveform in the active phase to fine-tune a firing angle from the encoder software;{'sub': 'on', 'k) adjusting the pulse time tbased on the estimated time base;'}{'b': '1', ') monitoring the shaft speed to track any change in the speed; and'}m) adjusting the dwell angle based on the shaft speed and the ...

Servo Motor System and Method

A servo motor system and method has been developed to provide speed, orientation, location, and/or direction detection using a single inductive sensor. Direction, orientation, speed, and/or location detection are detected using a single channel inductive sensor in a servo motor control system. Mechanical control systems using servo motors are easily upgraded with added safety, precision control, and automation using the inductive sensor system described herein. 1. A servo motor system comprising:one or more magnets fixed to a moving component of the servo motor system, each of the one or more magnets having a north pole and a south pole aligned to alternately induce a magnetic field into a face of an inductive sensor; determine an ON time of the inductive sensor as a result of moving the north pole and the south pole of each of the one or more magnets past the inductive sensor in an unknown direction;', 'determine the unknown direction to be a known first direction or a known second direction when the ON time is equal to a predetermined threshold associated with the first known direction or a predetermined threshold associated with the second known direction; and, 'a processor and memory non-transitively programmed toone or more servo motors that receive control signals as a result of the moving of the north poles and the south poles of each of the one or more magnets past the inductive sensor, wherein the one or more servo motors cause motion of a mechanical system.2. The servo motor system of claim 1 , wherein the mechanical system is a robotic arm claim 1 , an assembly line claim 1 , or an electro-mechanical machine.3. The servo motor system of claim 2 , wherein the unknown direction is a rotational direction.4. The servo motor system of claim 2 , wherein the unknown direction is a linear direction.5. The servo motor system of claim 1 , wherein the inductive sensor additionally detects speed or position.6. The servo motor system of claim 1 , wherein the inductive ...

SLOTLESS SYNCHRONOUS PERMANENT MAGNET MOTOR

A slotless synchronous permanent magnet motor includes a rotor, and a stator configured to electromagnetically interact with the rotor. The rotor is provided with a first conductive metal layer configured to create harmonic rotor saliency. 121-. (canceled)22. A slotless synchronous permanent (PM) magnet motor comprising:a rotor; anda stator configured to electromagnetically interact with the rotor;wherein:the rotor is provided with a first conductive metal layer configured to create harmonic rotor saliency,in cross-section of the rotor, the first metal layer is provided peripherally on the rotor, forming an arc of a first circle sector,the rotor is further provided with a second conductive metal layer configured to create harmonic rotor saliency,in cross-section of the rotor, the second metal layer is provided peripherally on the rotor, forming an arc of a second circle sector,a center of the arc of the second circle sector is at an angle with respect to a center of the arc of the first circle sector, andthe first metal layer and the second metal layer are connected to each other at each end portion or end of the rotor in an axial direction, whereby an inductance of an electrical phase decreases as the first metal layer and second metal layer align with energised winding portions of that electrical phase, resulting in a harmonic rotor saliency enabling rotor position detection without using an angle encoder.23. The slotless synchronous PM motor as claimed in claim 22 , wherein the first metal layer is made of copper or aluminium.24. The slotless synchronous PM motor as claimed in claim 22 , wherein the angle is about 180°.25. The slotless synchronous PM motor as claimed in claim 22 , wherein the first metal layer is arranged between magnet segments of the rotor to form a first central plane of the rotor claim 22 , and the second metal layer is arranged between magnet segments of the rotor to form a second central plane of the rotor claim 22 , perpendicular to the ...

ROTARY MACHINE CONTROL DEVICE

A rotary machine control device includes a current detector to detect a rotary machine current flowing through a rotary machine, a position estimator to estimate a rotor position, a controller to output a rotary machine voltage instruction for driving the rotary machine on the basis of the rotary machine current and the rotor position, and a voltage applicator to apply a voltage to the rotary machine on the basis of the rotary machine voltage instruction. The position estimator estimates the rotor position from a flux linkage inductance variable component produced by an inductance variable component and the rotary machine current. 1. A rotary machine control device for controlling a rotary machine whose inductance includes an inductance variable component that changes with a rotor position , the rotary machine control device comprising:a current detector to detect a rotary machine current flowing through the rotary machine;a position estimator to estimate the rotor position;a controller to output a rotary machine voltage instruction for driving the rotary machine on a basis of the rotary machine current and the rotor position; anda voltage applicator to apply a voltage to the rotary machine on a basis of the rotary machine voltage instruction, whereinthe position estimator estimates the rotor position from a flux linkage inductance variable component produced by the inductance variable component and the rotary machine current.2. The rotary machine control device according to claim 1 , whereinthe inductance of the rotary machine includes a first component that does not change with the rotor position and a second component that changes at a frequency twice as high as the rotor position, andthe inductance variable component is the second component.3. The rotary machine control device according to claim 1 , whereinthe position estimator estimates the rotor position using a flux linkage inductance variable component computed value that is the flux linkage inductance ...

CONTROL DEVICE OF PERMANENT MAGNET SYNCHRONOUS MOTOR AND IMAGE FORMING DEVICE

A control device of a permanent magnet synchronous motor that is a control device of a sensorless-type permanent magnet synchronous motor in which a rotor using a permanent magnet rotates by a rotating magnetic field caused by a current flowing in an armature includes: a driver that applies a voltage to the armature and drives the rotor; an initial position estimator that estimates an initial position which is a magnetic pole position of the rotor that is stopped; and a controller that controls the driver so as to apply a pulse train including a voltage pulse for searching the initial position for each of n angle positions dividing a search range of an electrical angle of 360 degrees to the armature, wherein the pulse train includes a first pulse and a second pulse. 1. A control device of a permanent magnet synchronous motor that is a control device of a sensorless-type permanent magnet synchronous motor in which a rotor using a permanent magnet rotates by a rotating magnetic field caused by a current flowing in an armature , the control device comprising:a driver that applies a voltage to the armature and drives the rotor;an initial position estimator that estimates an initial position which is a magnetic pole position of the rotor that is stopped; anda controller that controls the driver so as to apply a pulse train including a voltage pulse for searching the initial position for each of n angle positions dividing a search range of an electrical angle of 360 degrees to the armature, whereinthe pulse train includes a first pulse at one of the n angle positions and a second pulse that is a pulse, that generates a torque larger than the torque generated by the first pulse, at an angle position where a torque is generated for rotating the rotor in a second direction opposite to a first direction that is a rotation direction of the rotor in a case where a torque for rotating the rotor is generated by application of the first pulse.2. A control device of a permanent ...

Method and System for Acquiring Rotor Position of Rotary Transformer

A method and a system for acquiring a rotor position of a rotary transformer are provided. The system includes: a rotary transformer decoder, a low pass filter and a microprocessor, which includes a synchronous demodulation module and a calculation module. The rotary transformer decoder outputs an excitation signal and acquires first position information of the motor rotor. The calculation module performs calculation to acquire second position information of the motor rotor. The rotary transformer decoder and software decoding are integrated to acquire two rotor positions, and the two rotor positions are compared. In a case that a preset determining condition is met, one of the rotor positions is used for motor control, and the other is used as redundant data for backup, thereby improving the reliability of the acquired rotor position. 1. A system for acquiring a rotor position of a rotary transformer , comprising: a rotary transformer decoder , a low pass filter and a microprocessor , whereinthe microprocessor comprises a synchronous demodulation module and a calculation module,the rotary transformer decoder is electrically connected to the rotary transformer through the low pass filter, and is configured to output an excitation signal to drive the rotary transformer and acquire first position information of the motor rotor, the first position information comprising at least a first rotor position and a first rotor speed,the synchronous demodulation module is electrically connected to the rotary transformer decoder and the rotary transformer, and is configured to collect at least a rotary transformer cosine signal and a rotary transformer sinusoidal signal outputted from the rotary transformer and output a feedback signal, the feedback signal comprising at least a target rotary transformer sinusoidal signal and a target rotary transformer cosine signal,the calculation module is connected to the synchronous demodulation module, and is configured to perform ...

METHOD FOR DETERMINING THE ROTATIONAL ANGULAR POSITION OF THE ROTOR OF A MULTIPHASE ELECTRIC MACHINE

A method for determining the position of the rotor of a multiphase electric machine with pole windings, the inductances of which are uniquely connected to the rotational angular position of the rotor in the currentless state at least within rotational angular periods. At least one measurement point between pole windings, a measurement signal which depends on the current inductances of the pole windings and which is generated by voltage jumps at a phase conductor input is tapped. Multiple measurement points are provided for tapping a signal, the measurement points being arranged collectively at one and the same phase conductor. For each measurement point, the respective phase conductor with the lowest current operating current is selected. 110-. (canceled)11. A method for determining rotational angular position of a rotor of a multiphase electric machine with pole windings , inductances of which , in a de-energized state , at least within rotational angular periods , are explicitly connected to the rotational angular position of the rotor wherein , the method comprising the steps of: tapping off a measurement signal that is dependent upon instantaneous inductances of the pole windings of the electric machine and is generated by a voltage jump at a phase conductor input for determining the rotational angular position at a measurement point between pole windings; and , for determining the rotational angular position , respectively tapping-off measurement signals at a plurality of measurement points that are respectively arranged on a single phase conductor.12. The method according to claim 11 , wherein the measurement signal is a voltage signal which is divided in accordance with the inductances of the pole windings of the electrical machine claim 11 , generated by division of the voltage jump claim 11 , wherein a potential jump which corresponds to the voltage jump is determined on the respective measurement point.13. The method according to claim 11 , including ...

MOTOR CONTROL APPARATUS INCLUDING CURRENT DETECTION UNIT FOR DETECTING COIL CURRENT AND IMAGE FORMING APPARATUS

A motor control apparatus includes: a current detection unit configured to detect currents flowing through a plurality of coils of a motor, and includes a first detection unit that detects a current flowing through a first coil of the plurality of coils, and a second detection unit that detects a current flowing through a second coil of the plurality of coils; a determination unit configured to perform determination processing for determining a stopping position of a rotor of the motor based on a detection result of the current detection unit; and a calibration unit configured to calibrate the second detection unit based on a detection result of the first detection unit and a detection result of the second detection unit when a current is flowing in a series connection of the first coil and the second coil in the determination processing. 1. A motor control apparatus comprising:a current detection unit configured to detect currents flowing through a plurality of coils of a motor, and includes a first detection unit that detects a current flowing through a first coil of the plurality of coils, and a second detection unit that detects a current flowing through a second coil of the plurality of coils;a determination unit configured to perform determination processing for determining a stopping position of a rotor of the motor based on a detection result of the current detection unit; anda calibration unit configured to calibrate the second detection unit based on a detection result of the first detection unit and a detection result of the second detection unit when a current is flowing in a series connection of the first coil and the second coil in the determination processing.2. The motor control apparatus according to claim 1 , wherein the calibration unit is further configured to calibrate the second detection unit by obtaining a correction factor for correcting a value to be detected by the second detection unit based on the detection result of the first detection ...

Synchronous motor drive system and synchronous motor

In sequentially selecting and driving two phases of the three-phase stator windings of a synchronous motor, detect a speed electromotive voltage of a de-energized phase, relate the speed electromotive voltage to rotor position information beforehand, then count rotor position information backward based on the detected the speed electromotive voltage to estimate rotor position; and then detect rotation speed from the change rate of the rotor position information so as to achieve highly accurate position and speed control.