Способ инверторного запуска дизель-генератора

Изобретение относится к области электротехники и может быть использовано для запуска дизель-генераторов транспортных средств. Техническим результатом изобретения являются отсутствие бросков тока, потребляемого от аккумуляторной батареи, предотвращение выпадения синхронного генератора из синхронизма в процессе раскрутки коленчатого вала дизеля, что гарантирует его запуск, а также отсутствие необходимости устанавливать датчик положения ротора. Заявленный технический результат достигается за счет ориентации ротора синхронного генератора по магнитному полю статора путем подачи в фазные обмотки симметричной системы синусоидальных токов с частотой, равной нулю, в течение заданного времени с последующим плавным увеличением частоты фазных токов от нуля до заданного значения. Одновременно с началом увеличения частоты фазных токов возможно смещение их фазы вперед на нормированный угол. При запуске дизеля контролируют входное напряжение инвертора и при превышении им нормированного значения дополнительно ...

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 ...

Einrichtung zum Betrieb eines Asychronmotors, der über Stromrichter gespeist wird

Anordnung zur Drehzahlregelung eines Asynchronmotors

Regelkreis zum Betrieb einer Asynchronmaschine

Verfahren zur automatischen Regelung eines Asynchronmotors, der von einem statischen Frequenzwandler gespeist wird

Einrichtung zur Drehzahlregelung von Asynchronmaschinen mit Kurzschlussläufer

Einrichtung zum Betrieb eines Asynchronmotors

Einrichtung zur Umformung einer Wechselspannung in eine Gleichspannung

Einrichtung zur Istwertbildung für die Regelung einer Drehstromasynchronmaschine

PROCEDURE AND MECHANISM FOR REDUCING THE CAPACITY OF A DRIVE ELECTRIC DRIVE.

METHOD FOR ACTUATING A MOTOR FOR STARTING A MILL

The invention relates to a method for actuating a motor (16) for starting up a mill (6) with material (20) to be milled. In order to permit more cost-efficient starting up of the mill in comparison to the prior art, it is proposed that the motor (16) for triggering sedimentation of the material (20) to be milled of the mill (6) be initially fed by a first inverter (25), that the motor (16) be subsequently disconnected from the first inverter (25), and that in a further step the motor (16) be connected to a first power system (21) which has a first power system voltage, wherein the maximum output voltage of the first inverter (25) is lower than the first power system voltage.

Improvements in and relating to controlled electric circuits

... 1,025,553. Automatic speed control. LICENTIA PATENT-VERWALTUNGS G.m.b.H. Feb. 14, 1963 [Feb. 20,1962], No. 6042/63. Heading G3R. [Also in Division H2] A load 8 is connected to a D.C. source 3 through inverter 1 and rectifier 2, both of the full-wave type, silicon controlled semi-conductor devices being used for one of the two oppositely poled rectifiers in each phase of the inverter. The return of energy to the source 3 through the rectifier 2 is controlled by a silicon controlled rectifier 6 associated with choke 5 and diodes 7 which block current-flow in an undesirable direction. The load consumption is determined by controlling the onoff periods of the device 6. A three-phase motor is connected to inverter group 1 and rectifier group 2, unit 10 controlling the on-off periods of group 1 and thereby the frequency of the current supplied to the motor. The unit 10 also controls pulsing circuit 4 between the rectifier 2 and source 3. A reference signal applied to unit 10 is compared with ...

METHOD FOR ACTUATING A MOTOR FOR STARTING A MILL

The invention relates to a method for actuating a motor (16) for starting up a mill (6) with material (20) to be milled. In order to permit more cost-efficient starting up of the mill in comparison to the prior art, it is proposed that the motor (16) for triggering sedimentation of the material (20) to be milled of the mill (6) be initially fed by a first inverter (25), that the motor (16) be subsequently disconnected from the first inverter (25), and that in a further step the motor (16) be connected to a first power system (21) which has a first power system voltage, wherein the maximum output voltage of the first inverter (25) is lower than the first power system voltage.

STARTER/DREHSTROMGENERATOR MIT NEUNPHASEN-INDUKTIONSMOTOR

Elektrischer Induktionsmotor, umfassend:neun separate Anschlussklemmen, die dazu ausgestaltet sind, neun separate Stromeingänge (11 - 19) von neun Ausgangsphasen eines neunphasigen Inverters zu empfangen;neun Wicklungen (L1 - L9), die mit neun separaten Anschlussklemmen verbunden sind;eine Vielzahl von Schützen, wobei jeder der Vielzahl von Schützen dazu ausgestaltet ist, selektiv in einem Kreis geöffnet oder geschlossen zu werden, der die neun Wicklungen (L1 - L9) umfasst, um selektiv die neun Wicklungen (L1 - L9) in einer Gitterkonfiguration oder einer Sternkonfiguration miteinander zu verbinden;wobei jede der neun Wicklungen dazu ausgestaltet ist, selektiv zwischen zwei der neun separaten Stromeingänge (I1 - 19) verbunden zu werden, mit einer Phasenwinkeldifferenz zwischen den zwei separaten Stromeingängen von 40 Grad;wobei jeder der Vielzahl von Schützen des Weiteren dazu ausgestaltet ist, selektiv geöffnet oder geschlossen zu werden, um einen Spannenwert für die Gitterkonfiguration ...

An arrangement for the operation of an induction motor

... 1,008,961. Control of A.C. motors. LICENTIA PATENT VERWALTUNGS - G.m.b.H. June 15, 1962 [June 16, 1961], No. 23108/62. Heading H2J. [Also in Division G3] An induction motor is supplied through static converter 2 having control unit 3 receiving a control signal from tachometer generator 6 so that the output frequency and voltage of the converter are varied proportionally with variations of the control signal. The unit 3 also receives a signal representing the deviation between the desired and actual speeds of the motor to limit the slip between the rotating field and the rotor. The deviation signal is supplied to the unit 3 through amplifier 4 whose output is limited and which has an adjustable proportional-integral action whereby the motor may have a rigid speed control or a control such that the speed yields to the torque. The amplifier 4 may also provide derivative or doublederivative signals. The control unit 3 may comprise a shunt-wound D.C. motor which converts the voltage received ...

Device being used to make function an asynchronous motor supplied via static inverters

Einrichtung zur Istwertbildung fuer die Regelung einer Drehstromasynchronmaschine

Arrangement for the speed regulation of a synchronous engine

AN ARRANGEMENT FOR FREQUENCY -ANALOGOUS SPEED CONTROL OF AN INDUCTION MACHINE FED THROUGH AN INVERTER.

METHOD FOR ACTUATING A MOTOR FOR STARTING A MILL

In a method for actuating a motor for starting up a mill containing material to be ground, the motor for triggering sedimentation of the material to be ground in the mill is initially fed by a first inverter. The motor is subsequently disconnected from the first inverter, and in a further step the motor is connected to a first supply which has a first supply voltage. The maximum output voltage of the first inverter is lower than the first supply voltage.

Variable-frequency electric control system for mine lifter on basis of TKD system

Procedimiento para el direccionamiento de un motor para arrancar un molino

La invención se refiere a un procedimiento para el direccionamiento de un motor (16) para arrancar un molino (6) con material de molienda (20). Para posibilitar un arranque del molino más eficiente en cuanto a los costos en comparación con el estado de la técnica, se propone que el motor (16) para desintegrar una sedimentación del material de molienda (20) del molino (6) sea alimentado primero por un primer convertidor de frecuencia (25), a continuación se separe el motor (16) del primer convertidor de frecuencia (25) y en una etapa posterior el motor (16) se conecte a una primera red (21) que presenta una primera tensión de red, en donde la tensión máxima de salida del primer convertidor de frecuencia (25) es menor que la primera tensión de red; Procedimiento; Dispositivo; Disposición.

Application device of variable-frequency controller on electric fan

Circuit intended for the regulation of the operation of an asynchronous machine

Device to regulate the speed of asynchronous rotor machines in short-circuit

Способ управления током асинхронного двигателя при питании от автономного инвертора напряжения

Изобретение относится к области электротехники и может быть использовано для управления оптимальными по быстродействию электроприводами. Техническим результатом является стабилизация частоты переключения тока автономного инвертора напряжения, питающего статор асинхронного двигателя. что приводит к снижению нагрева транзисторов инвертора и повышению энергоэффективности электропривода. В способе регулирования тока статора асинхронного двигателя при питании его от автономного инвертора напряжения, выполненного с фазными плечами на транзисторах, включающем регулирование тока двигателя посредством управления транзисторами фазных плеч инвертора, определяют ошибку регулирования путем сравнения задающего синусоидального сигнала соответствующей фазы и текущего значения тока той же фазы; сигналом ошибки регулирования для каждой фазы воздействуют на двухпозиционный релейный регулятор тока соответствующей фазы, имеющий характеристику вход-выход с положительным и отрицательным гистерезисом. При регулировании ...

VERFAHREN UND VORRICHTUNG ZUR STUFENLOSEN STEUERUNG DER DREHZAHL EINER DREHSTROM-ASYNCHRONMASCHINE

Von einer Gleichstromquelle gespeister,selbstgefuehrter Wechselrichter

Verfahren zur Drehzahlregelung eines ueber einen Pulswechselrichter gespeisten Asynchronmotors

An arrangement for the control of converters which feed alternating-current machines

... 1,042,322. Automatic speed control. LICENTIA PATENT-VERWALTUNGS G. m. b. H. May 3, 1963 [May 3, 1962], No. 17603 /63. Addition to 100, 896. Heading G3R. [Also in Division H2] The induction motor control system of the parent Specification is modified in that the control signals for the three phase, cross-connected or anti-parallel valve or semi-conductor converters are now produced by static circuits. A self-oscillating circuit loop comprises integrators 11, 21 and multipliers 12, 22, e.g. Hall plate devices. Two phase outputs at 90 degrees can be taken from 11 and 21 of amplitude largely independent of frequency, or from 12, 22 of amplitude proportional to frequency. It is shown that frequency and phase sense depends on a magnitude and direction of the D.C. signal from tachogenerator 1. The two phase output is converted to three phase, either by a transformer (Fig. 3, not shown) or by a multiplying and adding network (Figs. 4... 6, not shown). The three phase signals appear on three pairs ...

AC motor inverter control - includes variable frequency reversible oscillator and thyristors firing control circuit

The control circuit of an a.c. motor ensures improved performance, in partic. at low speed. The reversible movement of the motor is obtd. with an inverter and a variable frequency oscillator fot its frequency setting. The oscillator includes an integrator which provides a ramp output voltage with rise rate dependent on the d.c. component of the input signal. The clocking pulses and the sense signals are derived with positive and negative comparators shunting the integrator output. A logic gate is fitted between the comparators and the integrator resetting switch while the sense flip-flop of the comparators feeds a forward and reverse signal. The flip-flop is connected to ring counter controlling the firing pulses of the thyristor and receives signals from the logic gate via a delay line.

Drive unit for washing machines etc. - has three=phase asynchronous motor with at least 2 slots per pole and phase

A drive unit is for washing machines or similar appliances and its several features include a three-phase asynchronous motor with a number of slots in excess of two slots per pole and phase. The rotor slot number is bigger than the stator slot number of the motor. The sheets of the sheet parcel (stator) are welded together at the back and not incorporated into a housing. The motor coil can be converted to different voltages and a heat monitor is installed inside the motor coil. A frequency transformer is provided and the changing of the revolution direction is achieved by means of controlling the frequency transformer output and the transformer is programmed differently for different accelerations and decelerations. An impedance sensor alters the control signals for the transformer. ADVANTAGE - The drive unit runs quietly and is suitable for hospitals, etc.. The motor has been improved and no disturbances are caused in the mains supply to affect data processing functions or medical equipment ...

Assembly for the control of an asynchronous machine

Autonomous inverter supplied with a source with D.C. current

VERFAHREN UND ANORDNUNG ZUM STEUERN DES AUSGANGES EINES SELBSTERREGTEN WECHSELSTROMMOTORS

Method for actuating a motor for starting a mill

The invention relates to a method for actuating a motor (16) for starting up a mill (6) with material (20) to be milled. In order to permit more cost-efficient starting up of the mill in comparison to the prior art, it is proposed that the motor (16) for triggering sedimentation of the material (20) to be milled of the mill (6) be initially fed by a first inverter (25), that the motor (16) be subsequently disconnected from the first inverter (25), and that in a further step the motor (16) be connected to a first power system (21) which has a first power system voltage, wherein the maximum output voltage of the first inverter (25) is lower than the first power system voltage.

AN INVERTER CONTROLLED MOTOR DRIVE FOR MACHINES WITH A FRACTIONAL SPEED RANGE

Three-phase motor infinitely-variable speed setter - for asynchronous motors with slip-ring rotors reduces maintainance costs

The unit is for infinitely-variable speed regulation of asynchronous three-phase motors and comprises a three-phase generator for supplying the electrical energy to the three-phase motor, the three-phase generator being provided with a three-phase field (excitation) winching that is connected to a frequency changer (11). The direction of rotation of the exciter field, relative to that of the rotor containing the field (excitation) winding is specifically opposite to that of the rotor itself.

Stepless speed control for three phase asynchronous motor - involves frequency converter with current and speed control

The object is to provide a versatile stepless speed controller which can be used to drive standard induction motors in a variety of variable speed applications. The converter comprises a supply system commutated controlled rectifier feeding d.c. via an energy storage choke to a self commutating inverter which in turn feeds the motor. The control signals used to regulate the inverter are control and reference values of motor current together with control and reference values of motor voltage or speed. It is the use of these signals which permits the employment of standard motors and also gives satisfactory control when regenerating or changing direction of rotation.

Non feedback type AC frequency conversion apparatus for asynchronous motor

The invention relates to an AC frequency conversion speed regulating technique of an asynchronous motor, in particular to an AC frequency converting apparatus of a feedback-free type asynchronous motor. The invention solves the problems that the asynchronous motor has wattles current and loss in the processes of converting frequency and regulating speed, and the prior frequency converting apparatus has higher cost, can not fully balance the wattles power and does not have ideal energy-saving effect. The AC frequency converting apparatus comprises a three phase rectifier bridge, and a three phase inverter bridge which is connected between DC output ends of the three phase rectifier bridge and consists of six thyristors, wherein three main capacitance bridge circuits respectively formed by connecting in serial with two power capacitors are connected between the DC output ends of the three phase rectifier bridge, three midpoints of the three phase inverter bridge lead out three ends respectively ...

Rotating electrical machine - Has outer rotor with flat permanent magnets and inner rotor with salient pole windings commutated in groups

An electric machine has two concentric rotating components with an air gap between them. The outer rotor carries on its inner face, an array of permanent magnets of alternating polarity. The inner rotor has a set of salient pole windings whose currents can be controlled either individually, or in independent groups, by an electronic unit (7,8). This unit has an optimisation program which tries to maximise the machine's efficiency by only activating sufficient pole groups to generate the required output. There are temperature sensors in the pole windings. If there are single windings switched out, these are alternately regulated with ones presently in operation so as not to exceed a preset working temperature. ADVANTAGE- Maintains maximum efficiency for all load conditions.

Regelkreis zum Betrieb einer Asynchronmaschine

AN INVERTER CONTROLLED MOTOR DRIVE FOR MACHINES WITH A FRACTIONAL SPEED RANGE

... 1,242,285. Control of A.C. motors. LICENTIA PATENT - VERWALTUNGS - G.m.b.H. 30 Sept., 1968 [29 Sept., 1967], No. 46301/68. Heading H2J. [Also in Division G3] In an inverter controlled motor drive for a machine which is to be operated in a speed range which is a fraction (e.g. 30%) of the whole rated speed range of the motor and which requires a torque falling with the speed, the motor being fed with variable voltage and frequency by a forced commutated inverter-the motor is designed and constructed with such a relatively small stator/rotor air gap and air gap flux density and is supplied with such a low magnetization current that over the whole said fractional speed range, with the inverter output voltage maintained constant, the motor current including no load current is never greater than the motor current at the rated speed of the motor. Compared with the motor designed to operate at the normal rated full speed, the present motor has an increased number of stator turns in order that ...

Arrangements for Controlling the Speed of Asynchronous Electrical Machines

... 1,150,719. Control of A.C. motors; frequency changing. BROWN BOVERI & CO. Ltd. 27 May, 1966 [29 May, 1965], No. 23933/66. Headings H2F and H2J. [Also in Division G3] A squirrel cage induction motor is energized through a frequency converter whose output frequency (and voltage) is controlled by the frequency and voltage of three A.C. signals U R 1, U S 1, U T 1 compounded from two signals each of which is produced in an arrangement comprising a fixed, medium frequency, sine wave generator 10a, 10b whose output is commutated at lla, 11b by a square wave 9a, 9b of a frequency which is varied about that of the sine wave by a control signal Ug(f) related to the speed of the motor. Harmonics are removed from the beat frequency at 12a, 12b and the amplitude of the resulting two signals is controlled by a second control signal Ug(A) applied to multipliers 13a, 13b, e.g. Hall devices. The direction of rotation depends upon whether the square wave frequency is above or below that of the sine wave ...

EINRICHTUNG ZUR ISTWERTBILDUNG FUER DIE REGELUNG EINER INSBESONDERE UMRICHTERGESPEISTEN DREHSTROMASYNCHRONMASCHINE

SCHALTUNGSANORDNUNG ZUR STEUERUNG DER FREQUENZ EINES EINEN SYNCHRONMOTOR SPEISENDEN UMRICHTERS

Method for actuating a motor for starting a mill

The invention relates to a method for actuating a motor (16) for starting up a mill (6) with material (20) to be milled. In order to permit more cost-efficient starting up of the mill in comparison to the prior art, it is proposed that the motor (16) for triggering sedimentation of the material (20) to be milled of the mill (6) be initially fed by a first inverter (25), that the motor (16) be subsequently disconnected from the first inverter (25), and that in a further step the motor (16) be connected to a first power system (21) which has a first power system voltage, wherein the maximum output voltage of the first inverter (25) is lower than the first power system voltage.

Frequency transverter for operating polyphase induction motor - with control electronics to set operating frequency and voltage according to ideal motor speed

A frequency transverter is for the operating of an asynchronous polyphase induction motor. The operating frequency and the operating voltage of the motor are determined by an electronic control system in accordance with the ideal revolution speed of the motor. A signal corresponding to the prevailing actual speed of the motor is fed to the control electronics and the operating voltage and frequency are adjusted in accordance with the actual revolution speed and storage values, which embody for different actual speeds those voltages and speeds at which the motor works with a high degree of efficiency. The control electronics regulate the operating frequency in accordance with the ideal speed and the actual speed. ADVANTAGE - The motor works with an optimum degree of efficiency with an adjusted revolution speed ...

Método para controlar um motor, dispositivo de controle, unidade de acionamento, e, arranjo de moinho

Motor driving apparatus

Dual -frenquency machine controller

MOTOR CONTROL DEVICE

A method and system to convert a constant speed motor drive (40) into a variable speed motor drive (80) are disclosed. The method comprises disconnecting a second terminal (68) from a first terminal (54) by removing from the constant speed motor drive (40) a first cover assembly (46) comprising the second terminal (68), the constant speed motor drive (40) comprising the first cover assembly (46) and a base assembly (42) including the first terminal (54), the cover assembly further comprising a constant speed controller (66), the first terminal (54) adapted to receive an alternating-current (AC) voltage and including motor contacts operable to output a motor voltage, wherein the constant speed controller (66) generates the motor voltage for the motor contacts when the constant speed controller (66) operates; and connecting a third terminal (68) to the first terminal (54) by coupling a second cover assembly (82) to the base assembly (42), the second cover assembly (82) comprising the third ...

Intelligent frequency conversion speed adjusting device of high voltage motor

Induction motor rotary speed control - uses coil reversal according to working programme and loading momentum to align motor currents

To control the rotary speed of induction motors by frequency converters, in machines and vehicles where torques of different levels are required, the motor currents are aligned by reversing the coil according to the working program and loading momentum. The coil is in more than two grooves, for each pole and phase, with a higher number of rotor grooves than stator grooves. The coil is a chord semi circular winding. To minimise the current, the working motor coil is selectively switched in series or parallel by the power electronics together with different running and acceleration speed ramps. The programmed reverse or switch-on circuit for working also contains the programming for the frequency converter with internal or external programming to give a direct or indirect reverse of the motor working coil according to the current voltage and/or frequency value. The meter, to measure the voltage or current or power, has an outlet to reverse the working coil with a time delay. The unit or reverse ...

EINRICHTUNG ZUR ISTWERTBILDUNG FUER DIE REGELUNG EINER INSBESONDERE UMRICHTERGESPEISTEN DREHSTROMASYNCHRONMASCHINE

The speed of the frequency converter system tracking method and speed tracking device

Method for controlling and regulating an asynchronous machine

In order to control and regulate an asynchronous machine which is supplied from an invertor with an impressed variable or constant DC voltage, it is intended to specify a regulation method in which the fluctuations of the flux and stator current space vectors are overcome. This is achieved in that a desired in-phase current value (iww) is specified in order to influence the torque, this value is compared with the actual in-phase current value (iwx) measured at the invertor input, and the regulation deviation is fed to an in-phase current regulator (6, 21) whose output signal prescribes the stator frequency ( omega 1) of the machine (1, 17) and is proportional thereto, and in that, if the voltage at the invertor input is variable, this is adjusted in accordance with the relationship k( omega 1 x psi + I0 x R1), omega 1: stator frequency psi : desired flux value I0: no-load current R1: stator resistance k: constant factor with respect to a constant voltage at the input of the invertor, by ...

Induction motor with two independent stator windings - has windings supplied from fixed and variable frequency sources for speed control

The cage type induction motor is built with two independent three phase stator windings (9,10). One winding is supplied at mains frequency, the other is connected to a variable frequency supply. By constructing the machine in this manner, the power output of the necessary frequency converter can be reduced and consequently the overall efficiency increased. The motor speed is determined by the sum of the frequencies, and the number of poles. The stator windings may be in adjacent cores or be made with one winding over the other. If the variable frequency winding is connected for the opposite rotation to that of the fixed frequency one speed control down to standstill can be achieved. Start up is normally on fixed frequency.

The inductance of the synchronous motor device and method for measuring

Anordnung zur frequenzanalogen Drehlzahlregelung einer wechselrichtergespeisten Induktionsmaschine

Method for controlling the torque of an asynchronous machine

In this method for controlling the torque of an asynchronous machine (1) which can be supplied via an invertor (2) or converter from a DC source (3) or AC source, the stator frequency (f1) is formed by addition of a fed-back rotation frequency actual value (fn) and a slip-frequency preset valve (f2v) corresponding to a predetermined torque (M). The feedback of the rotation frequency actual value (fn) is in this case delayed. In consequence, during rapid changes in the rotation frequency actual value (fn), the torque actual value (Mact) on the asynchronous machine (1) is reduced, which has a speed-stabilising effect. The method is used especially for controlling the drives of rail vehicles. ...

Economizador de energia elétrica para motores trifásicos

Schaltungsanordnung zur Steuerung der Frequenz eines Umrichters

Frequency converter for three phase machines - gives twelve pulse output by use of two inverter stages

Undesirable losses and torque modulations can be minimised by using a twelve pulse output. In a frequency converter with an intermediate d.c. stage this is achieved by adding a second output inverter connected via its own smoothing inductor to the output of the supply commutated converter. The inverter sections are arranged to have 30 deg. displacement between output voltages. The output is typically commoned by a choke coil in each phase with a centre tap from each coil feeding the load machine. The system is applicable to any sort of rotating field load.

UMRICHTERSCHALTUNG FUER EINE DREHFELDMASCHINE

METHOD FOR ACTUATING A MOTOR FOR STARTING A MILL

Intelligent bypass system for high-voltage frequency converter

Einrichtung zur Steuerung von Wechselstrommaschinen speisenden Umrichtern

VERFAHREN UND ANORDNUNG ZUR DREHZAHLREGELUNG EINES AUS EINEM PULSWECHSELRICHTER GESPEISTEN ASYNCHRONMOTORS

Method for operating a three-phase motor using a converter with a variable frequency and voltage

A method is proposed for operating a three-phase motor using a converter with a variable frequency and voltage, in the case of which method, according to a first variant, the three-phase motor is operated in a star circuit at a constant power and with a relatively high moment in a lower rotation speed adjustment range, and in a delta circuit at a constant power and with a relatively low moment in an upper rotation speed adjustment range. According to a second variant using a three-phase motor with a reversible pole winding, the three-phase motor is operated using a relatively large number of pole pairs at constant power and with a relatively high moment in a lower rotation speed adjustment range, and with a relatively small number of pole pairs at constant power and with a relatively low moment in an upper rotation speed adjustment range. According to a third variant using two converters and a three-phase motor having two star windings, the three-phase motor is operated with two parallel ...

MESSWERTUMFORMER ZUR UMFORMUNG EINER WECHSELSPANNUNG EINES MEHRPHASIGEN SYMMETRISCHEN DREHSTROMSYSTEMS IN EINE AMPLITUDEN PROPORTIONALE GLEICHSPANNUNG

Einrichtung zur Umformung einer Wechselspannung in eine Gleichspannung

Dual frequency motor controller

Schaltungsanordnung zur Speisung einer elektrischen Wechselstrommaschine mit parallel geschalteten Wicklungssträngen

Anordnung zur Durchfuehrung eines Verfahrens zur Steuerung oder Regelung der Drehzahl einer in beiden Drehrichtungen betriebenen Drehstrommaschine

Schaltungsanordnung zum Steuern von Antriebsmotoren fuer Schiffswinden

Frequency conversion pressure reducing type motor electricity -saving appliance

Method of and system for minimizing current consumption of one or more A-C motors driving a variable load

In order to minimize the current consumption of an alternating-current motor of the induction or the synchronous type (or possibly a plurality of such motors connected in parallel) driving a variable load, a sensor coupled to a supply line of the motor detects the occurrence of a significant change in its operating current and determines the sense of that change. A controller responsive to signals from the sensor then reduces the supply voltage by an incremental or decremental step and, if the sensor detects a resulting decrease in amperage, continues with one or more similar steps until the current levels off. If the initial voltage modification causes the current to rise, the controller progressively changes the supply voltage in the opposite sense until the amperage reaches a minimum. In the case of an induction motor whose rotor speed is controllable by variations in slip frequency with the aid of an arithmetic unit responsive to a tachometric signal and to voltage feedback from the ...

An electrical drive system for operating an electrical machine

AC frequency conversion speed regulation control equipment of rotary drill rig

Frequency-changing power-saving control cabinet of oil extractor

MAGNETIC FLUX ESTIMATE

Examples include a method for a method for controlling a synchronous motor using a variable speed drive. The motor comprises a permanent magnet rotor generating a magnetic flux. The method comprises applying a predefined electrical command signal to the motor and estimating a motor speed in response to the applying of the predefined electrical command signal. The method also comprises reaching a desired estimated motor speed and, in response to reaching the desired estimated motor speed, estimating a parameter related to the magnetic flux of the permanent magnet rotor. The method further comprises recording the estimated parameter.

METHOD FOR ACTUATING A MOTOR FOR STARTING A MILL

Intelligent bypass system for high-voltage frequency converter

Frequency conversion system of rotor of alternating current mine hoist

The invention mainly provides a frequency conversion system of a rotor of an alternating current mine hoist. An electromotor rotor winding, a rotor frequency modulation and voltage modulation device (1) and a switch cabinet (2) form a rotor frequency conversion and speed regulation part; a process control part consisting of a master control PLC (Programmable Logic Controller) and an auxiliary control PLC realizes a bi-wiring type of the system control of the mine hoist; an operation platform and a host computer realize the bi-wiring type of the system monitoring of the mine hoist together; two speed measurement elements installed at the end of the spindle of the hoist and a limit switch installed in a shaft form a depth and speed detecting part to realize the three-wire type of hoisting position control, data exchange is performed among the master control PLC (3), the auxiliary control PLC (4), a human-computer interface (5) and the rotor frequency modulation and voltage modulation device ...

Heating method and device of motor and frequency converter

Frequency conversion control circuit of forced and induced draft fan

Arrangements for Controlling the Speed of Asynchronous Electrical Machines

Roving machine with transducer

método para controlar um motor, dispositivo de controle, unidade de acionamento, e, arranjo de moinho

Fuel Efficient Crane System

A system and method for efficiently regulating the fuel consumption of a variable speed combustion engine used to control loads such as a hoist motor in a mobile gantry crane based on load motor speed commands issued by a crane operator. The system and method can rely on a programmable logic controller to issue engine fuel commands to regulate engine speed based on interpolations derived from data representing the relationship between load motor voltage and engine speed and data representing the relationship between engine speed and engine power capacity. The method may also be used in modified form by combustion engines which need digital fixed speed commands.

Fast switching for power inverter

An apparatus includes an inverter including a high-side switch coupled to a low-side switch, the inverter generating a time-varying drive current from a plurality of drive control signals, a positive rail voltage, and a negative rail voltage wherein controlling the switches to generate the time-varying drive current produces a potential transitory overshoot condition for one of the switches of the inverter; a drive control, coupled to the inverter, to generate the drive control signals and to set a level of each of the rail voltages responsive to a plurality of controller signals; and a controller monitoring one or more parameters indicative of the potential transitory voltage overshoot condition, the controller dynamically adjusting, responsive to the monitored parameters, the controller signals to reduce a risk of occurrence of the potential transitory voltage overshoot condition.

Data transfer apparatus and method

Provided is a data transfer apparatus according to an embodiment of the present invention including: a power supply unit supplying operation power; a communication unit connected with an external apparatus and downloading inverter control data from the external apparatus; a memory storing the inverter control data downloaded by the communication unit; a connection unit connected to an inverter, transferring the inverter control data stored in the memory to the inverter, and supplying the operation power supplied through the power supply unit to the inverter; and a control unit allowing the operation power to be supplied to the inverter and allowing the inverter control data to be transferred to the inverter whenever the inverter is connected.

Induction motor driver

A switched resonant power converter applies AC to an induction motor. The power converter controls the magnitude and phase of the motor current, and tuning the stator flux accordingly in order to control the motor speed. A preprocessor operates on a speed command signal by getting the user speed command input to produce amplitude and phase-related signals for application to inputs of the power converter control.

Propulsion control apparatus

In a configuration in which an auxiliary power supply is connected to an intermediate link circuit of a main conversion unit, intermediate link voltage as input voltage of the auxiliary power supply is set at higher voltage depending on the main conversion unit as a main unit, and loss generated in a main circuit element of the auxiliary power supply increases; therefore, a problem has occurred that a cooling unit has to be increased in size. The main conversion unit recognizes a low-speed and stop state by monitoring a vehicle speed, and varies the intermediate link voltage corresponding to the vehicle speed; thereby, the loss generated in the main circuit element of the auxiliary power supply is reduced at the low-speed and stop state where cooling ability is decreased; as a result, small sizing and light weighting of the cooling unit is achieved.

Motor control system

In one aspect of the present invention, a motor control system includes a rectifier module enclosed in a first flame-proof enclosure, and having a first input and one or more rectifier circuits configured to convert a first AC voltage at the first input to a DC voltage to be output to a DC bus, and one or more variable-frequency drive (VFD) modules, each VFD module being enclosed in a respective second flame-proof enclosure and having a second input coupled to the DC bus, where each VFD module includes one or more inverter circuits configured to convert the DC voltage on the DC bus to a second AC voltage to be output to one or more motors.

DC-DC CONVERTER

A DC-DC converter is configured with a voltage-source power converter at a primary side of a transformer, a current-source power converter at a secondary side of the transformer, and a controller. The DC-DC converter is connected between a storage battery and an inverter that drives an electric motor. The controller generates a first control input based on a voltage between input and output terminals of the voltage-source power converter, a second control input based on a voltage between input and output terminals of the current-source power converter, and a command value for PWM or PFM control based on the first and second control inputs and an input-output current flowing between one of the input and output terminals of the voltage-source power converter and the current-source power converter. Therefore, it is easy to switch between a powering state and a regenerating state. 1. A DC-DC converter , comprising:a transformer;a voltage-source power converter that is provided at a primary side of the transformer;a first voltage detection circuit that detects a first voltage between first input and output terminals of the voltage-source power converter;a current-source power converter that is provided at a secondary side of the transformer;a second voltage detection circuit that detects a second voltage between second input and output terminals of the current-source power converter;a current detection circuit that detects an input-output current between the second input and output terminals of the current-source power converter; anda controller that controls the voltage-source power converter and the current-source power converter to transfer power between the primary side and the secondary side of the transformer, whereinthe first input and output terminals of the voltage-source power converter are connected to one of an inverter that drives an electric motor or a storage battery,the second input and output terminals of the current-source power converter are connected ...

Rectifier and inverter based torsional mode damping system and method

A torsional mode damping controller system is connected to a converter that drives a drive train including an electrical machine and a non-electrical machine. The controller system includes an input interface configured to receive measured data related to variables of the converter or the drive train and a controller connected to the input interface. The controller is configured to calculate at least one dynamic torque component along a section of a shaft of the drive train based on the measured data from the input interface, generate control data for a rectifier and an inverter of the converter for damping a torsional oscillation in the shaft of the drive train based on the at least one dynamic torque component, and send the control data to the rectifier and to the inverter for modulating an active power exchanged between the converter and the electrical machine.

INVERTER UNIT, INTEGRATED CIRCUIT CHIP, AND VEHICLE DRIVE APPARATUS

A miniaturizable, low-cost highly reliable inverter unit. A control circuit section for controlling operating timing of high breakdown voltage semiconductor elements included in an inverter circuit section and first and second drive and abnormality detection circuit sections for outputting drive signals for driving the high breakdown voltage semiconductor elements according to the operating timing and for feeding back an abnormality of the inverter circuit section to the control circuit section are formed on an SOI substrate as one integrated circuit chip. On the integrated circuit chip, circuit formation areas which differ in reference potential are separated from one another by dielectrics. A plurality of level shifters for transmitting signals exchanged between circuit formation areas separated by the dielectrics are formed. 1an inverter circuit section including a plurality of high breakdown voltage semiconductor elements;an integrated circuit chip including a first circuit section for controlling operating timing of the plurality of high breakdown voltage semiconductor elements and a second circuit section for outputting drive signals for driving the plurality of high breakdown voltage semiconductor elements according to the operating timing and for feeding back an abnormality of the inverter circuit section to the first circuit section formed on an SOl substrate; anda buffer circuit provided separately from the integrated circuit chip, for receiving the drive signals from the second circuit section and outputting the drive signals to the plurality of high breakdown voltage semiconductor elements,wherein:the second circuit section is provided in plurality, the inverter circuit section is provided in plurality, and the plurality of second circuit sections correspond to respective ones of the plurality of inverter circuit sections;each of the second circuit sections includes a high voltage side circuit section and a low voltage side circuit section;the first ...

Battery with Variable Output Voltage

A battery includes at least one battery module line and a control unit. The at least one battery module line has a plurality of battery modules mounted in series. Each battery module includes at least one battery cell and a coupling unit. The at least one battery cell is mounted between a first input and a second input of the coupling unit. The coupling unit is designed to switch the at least one battery cell between a first terminal of the battery module and a second terminal of the battery module, on a first control signal, and to connect the first terminal to the second terminal on a second control signal. The control unit is designed to transmit the first control signal to a first variable number of battery modules of the at least one battery module line. 1. A battery comprising:at least one battery module line including a plurality of series-connected battery modules; anda control unit,wherein each battery module of the plurality of series-connected battery modules includes (i) at least one battery cell and (ii) a coupling unit,wherein the at least one battery cell is connected between a first input and a second input of the coupling unit,wherein the coupling unit is configured (i) to switch the at least one battery cell between a first terminal of the battery module and a second terminal of the battery module in response to a first control signal, and (ii) to connect the first terminal to the second terminal in response to a second control signal, andwherein the control unit is configured (i) to transmit the first control signal to a first variable number of the battery modules of the plurality of series-connected battery modules and (ii) to transmit the second control signal to a remaining number of the battery modules of the plurality of series-connected battery modules, thereby enabling variable regulation of an output voltage of the at least one battery module line.2. The battery as claimed in claim 1 , wherein the control unit is configured to adjust a ...

Variable Switching Frequency Power Converter

A drive system for an electrical load such as an electric motor or generator comprises a PWM converter and a controller therefore. A signal indicative of a condition of the converter outpost is used in a controller to drive an optimal value of PWM switching frequency based on a load characteristic that is used to control the pulse switching frequency. The system takes account of the overall system in deriving an efficient PWM switching frequency. 1. A power converter system , comprising an electrical load , a power converter having a variable frequency output connected to the load , a controller operably connected to control the output of the power converter , means for producing a signal indicative of a load current , means for deriving a value of switching frequency of the output of the power converter based on an expression of a characteristic of the load and the signal , and means for setting the switching frequency of the power converter according to the value.2. A system as claimed in in which the means for deriving include a look-up table.3. A system as claimed in in which the means for deriving include means for running an algorithm.4. A system as claimed in in which the means for deriving include means for running a mathematical expression claim 1 , for example a polynomial expression.5. A system as claimed in in which the means for producing a signal include a current transducer arranged in relation to the output of the power converter.6. A system as claimed in in which the means for producing a signal include a current transducer arranged in relation to a supply to the power converter.7. A system as claimed in in which the power converter produces an a.c. power output from a d.c. power input.8. A system as claimed in in which the load is an electrical machine producing a mechanical output from an electrical power input claim 1 , for example an electric motor claim 1 , such as an a.c. induction motor.9. A system as claimed in in which the load is an ...

AC MOTOR DRIVING APPARATUS

In the case where DC power from a DC power supply is converted to AC power by an inverter and supplied to an AC motor, a power compensator is connected in parallel with a DC power input portion of the inverter, and a control device of the power compensator charges/discharges a power storage device to perform a power compensation process A when power demand for the AC motor exceeds a predetermined value, and takes into account power allowance which can be inputted and outputted from the DC power supply to the power storage device and performs a power storage adjustment process B of performing auxiliary charge of the power storage device within the range of the power allowance when the power compensation process A is unnecessary. 1. An AC motor driving apparatus comprising:a DC power supply which supplies DC power;an inverter which is connected to the DC power supply via a DC bus bar and converts the DC power to AC power and supplies the AC power to an AC motor; anda power compensator which is connected in parallel with a DC power input portion of the inverter, whereinthe power compensator includes: a power storage device which absorbs/discharges power; a step-up/down circuit which is connected between the DC bus bar and the power storage device and converts a voltage level: and a control device which controls the step-up/down circuit for exchanging DC power between the DC bus bar and the power storage device, and '(A) a power compensation process A in which in a period when DC-power-supply power exchanged by the DC power supply exceeds a DC-power-supply power running power limit determined on the basis of power which can be supplied by the DC power supply, power supplied from the DC power supply is reduced to the DC-power-supply power running power limit by discharging energy stored in the power storage device, and in a period when the DC-power-supply power is less than a DC-power-supply regeneration power limit determined on the basis of power which can be ...

POWER SUPPLY UNIT FOR PRESS MACHINE

A power supply unit for a press machine having a converter (converter circuit) connected to a commercial AC power supply, and an inverter (inverter circuit) connected to a press motor, includes an electrical energy bank, an inrush prevention circuit, an inrush prevention instruction signal generation section, and a contactor switch section, wherein contactors of the inrush prevention circuit are switched from on ON state to an OFF state and inrush prevention resistors of the inrush prevention circuit are connected to AC phase current paths on condition that the inrush prevention instruction signal generation section has generated and output an inrush prevention instruction signal (Sres) during press operation. 1. A power supply unit for a press machine having a converter connected to a commercial AC power supply , and an inverter connected to a press motor , and generating and outputting a motor drive power for driving the press motor ,an electrical capacity of the converter during power-running operation being smaller than an electrical capacity of the inverter during power-running operation,the converter being formed by a converter circuit, and the inverter being formed by an inverter circuit that implements a regeneration operation, andthe power supply unit comprising:an electrical energy bank that is provided in a DC current path and stores electrical energy, the DC current path connecting the converter circuit and the inverter circuit;an inrush prevention circuit that includes inrush prevention resistors and contactors that are respectively connected in parallel to AC phase current paths that connect the commercial AC power supply and the converter circuit;an inrush prevention instruction signal generation section that generates an inrush prevention instruction signal when a detected actual DC voltage of the DC current path is lower than a comparison reference voltage; anda contactor switch section that switches the contactors of the inrush prevention circuit ...

POWER CONVERSION DEVICE, MOTOR INCLUDING THE SAME, AIR CONDITIONER HAVING THE MOTOR INCORPORATED THEREIN, AND VENTILATION FAN HAVING THE MOTOR INCORPORATED THEREIN

A power conversion device includes a printed circuit board, whose mounting surface is opposite to an annular surface formed by an annular stator that constitutes a motor, arranged to be separated from the annular surface with a predetermined distance, and mounted with a Hall element that detects a rotation position of a rotor of the motor on a mounting surface on a side of the stator; an inverter IC that is mounted on the mounting surface on the side of the stator of the printed circuit board to supply a high-frequency current to the stator; and an overheat detection unit that is mounted on the mounting surface on the side of the stator of the printed circuit board and detects an overheated state of the inverter IC. When the overheat detection unit detects an overheated state, the inverter IC restricts or stops a current to be supplied to the stator. 1. A power conversion device comprising:a circuit board, whose mounting surface is opposite to an annular surface formed by an annular stator that constitutes a motor, arranged to be separated from the annular surface with a predetermined distance, and mounted with a Hall element that detects a rotation position of a rotor of the motor on a mounting surface on a side of the stator;a semiconductor module that is mounted on the mounting surface on the side of the stator of the circuit board and supplies a high-frequency current to the stator; andan overheat detection unit that is mounted on the mounting surface on the side of the stator of the circuit board and detects an overheated state of the semiconductor module, whereinwhen the overheat detection unit detects an overheated state of the semiconductor module, the semiconductor module restricts or stops a current to be supplied to the stator.2. The power conversion device according to claim 1 , wherein the semiconductor module includes a heat spreader that is mechanically coupled to and arranged on the circuit board claim 1 , and a semiconductor chip having a plurality ...

SYSTEMS AND METHODS FOR TRANSMITTING AND/OR UTILIZING HVDC POWER IN A SUBMARINE ENVIRONMENT

Systems and methods for transmitting and/or utilizing high voltage DC (HVDC) electric current in a submarine environment. The systems and methods may include the use of a submarine hydrocarbon pipeline to transmit both the HVDC electric current and a fluid stream. The systems and methods also may include the use of the HVDC electric current to do mechanical work within the submarine environment. Additionally or alternatively, the systems and methods may use a pressure-compensated electronics apparatus (PCEA) to receive the HVDC electric current and to produce a conditioned electric current therefrom. The systems and methods further may include controlling a pressure within the PCEA, controlling a temperature of electronic equipment contained within the PCEA, providing the conditioned electric current to a submarine energy consuming device, controlling the operation of the submarine energy consuming device, and/or producing, processing, and/or transmitting hydrocarbons with the submarine energy consuming device. 1. A submarine hydrocarbon pipeline for transmitting a fluid stream and a high voltage DC (HVDC) electric current , the submarine hydrocarbon pipeline comprising:an electrically conductive conduit defining a fluid pathway for transmitting the fluid stream and an electrical pathway for transmitting the HVDC electric current.2. The submarine hydrocarbon pipeline of claim 1 , wherein the electrically conductive conduit includes a metallic pipe.3. The submarine hydrocarbon pipeline of claim 1 , wherein the submarine hydrocarbon pipeline further includes an electrical insulator operatively attached to at least a portion of the electrically conductive conduit.4. The submarine hydrocarbon pipeline of claim 3 , wherein the electrical insulator includes an external electrical insulator configured to electrically isolate an external surface of the submarine hydrocarbon pipeline from electrical contact with the submarine environment.5. The submarine hydrocarbon pipeline ...

DRIVER FOR SWITCHING ELEMENT AND CONTROL SYSTEM FOR ROTARY MACHINE USING THE SAME

In a driver, a changing module changes a rate of discharging the control terminal of a switch at least between a first value and a second value lower than the first value. A measuring module measures a value of a parameter as a function of a current flowing through the conductive path of the switch during a drive signal being in an on state. A control module controls the changing module, as a function of the value of the parameter, to select the first value or the second value as the rate of discharging the control terminal of the switch upon the drive signal directing a change from the on state of the switch to an off state thereof. The control module discharges the control terminal of the switch using the selected value as the rate of discharging the control terminal of the switch. 1. A driver for selectively performing a charging task and a discharging task for an on-off control terminal of a voltage-controlled switch having a conductive path , according to a drive signal directing selectively an on state and an off state of the voltage-controlled switch , thus setting the voltage-controlled switch to one of the on state and the off state , the driver comprising:a discharging-rate changing module adapted to change a rate of discharging the on-off control terminal of the voltage-controlled switch at least between a first value and a second value lower than the first value;a measuring module configured to measure a value of a parameter as a function of a current flowing through the conductive path of the voltage-controlled switch during the drive signal being in the on state; anda discharging control module configured to:control the discharging-rate changing module, as a function of the value of the parameter, to select one of the first value and the second value as the rate of discharging the on-off control terminal of the voltage-controlled switch upon the drive signal directing a change from the on state of the voltage-controlled switch to the off state thereof; ...

THREE-PHASE AC TO DC CONVERTER AND AIR CONDITIONING APPARATUS USING THREE-PHASE AC TO DC CONVERTER

A three-phase AC to DC converter includes a three-phase AC power supply, a three-phase rectifier bridge circuit that is connected to the three-phase AC power supply and includes rectifying devices which are connected in a bridge configuration, a three-phase full-bridge circuit that includes two serially-connected switching devices for each of three phases, the two serially-connected switching devices being connected at an output side of the three-phase rectifier bridge circuit, and includes reverse blocking diodes which are connected in parallel to the respective switching devices, a reactor that connects the three-phase full-bridge circuit to the three-phase AC power supply, a smoothing capacitor connected to an output side of the three-phase full-bridge circuit, DC voltage detection means that detects an output voltage, power supply phase detection means that detects a power supply phase of the three-phase AC power supply, and pulse width modulator that outputs PWM signals which control the switching devices. 1. A three-phase AC to DC converter comprising:a three-phase AC power supply;a three-phase rectifier bridge circuit that is connected to the three-phase AC power supply, and that includes rectifying devices which are connected in a bridge configuration between two DC buses;a three-phase full-bridge circuit that includes two serially-connected switching devices for each of three phases, the two serially-connected switching devices being connected between the DC buses at an output side of the three-phase rectifier bridge circuit, and that includes reverse blocking diodes which are connected in parallel to the respective switching devices;a reactor that connects a connection point between the two serially-connected switching devices of each phase to a corresponding phase of the three-phase AC power supply;a smoothing capacitor connected between the DC buses at an output side of the three-phase full-bridge circuit;DC voltage detection means that detects an output ...

Motor drive system and control method thereof

A motor drive system comprising: an inverter that supplies power to a three-phase motor; and a control unit that, when first stopping and then commencing supply of alternating current to three phases of the three-phase motor, switches from first control to third control and then to second control, the first control putting switching elements in the inverter in a non-conduction state, the second control being PWM control of the switching elements, and the third control putting and keeping a switching element of each of an upper arm and a lower arm in the conduction state until commencement of the supply of current, the upper arm corresponding to a phase through which current flows in a direction entering the motor upon commencement of the supply, the lower arm corresponding to a phase through which current flows in a direction exiting the motor upon commencement of the supply.

METHOD FOR CONTROLLING INVERTER

A method for controlling an inverter in a system including a load, a motor for driving the load, and an inverter for operating the motor comprises when a load amount of the load is reduced to below a sleep level, checking whether a time corresponding to a sleep delay has lapsed; when the load amount of the load is still below the sleep level even after the sleep delay, varying an operating frequency of the motor, and if there is no change in a feedback from the load in response to the variation in the operating frequency, controlling the inverter to enter a sleep mode. 1. A method for controlling an inverter in a system including an electric load , a motor for driving the load , and an inverter for operating the motor , the method comprising:when a load amount of the load is reduced to below a sleep level, checking whether a time corresponding to a sleep delay has lapsed;when the load amount of the load is still below the sleep level even after the sleep delay, varying an operating frequency of the motor; andto controlling the inverter to enter a sleep mode.2. The method of claim 1 , further comprising:operating the motor in a normal state, when a feedback of the load amount is changed in response to the variation in the operating frequency.3. The method of claim 1 , wherein the step of controlling the inverter to enter a sleep mode comprises:controlling the inverter to enter a sleep mode when the feedback of the load amount is not changed in response to the variation in the operating frequency.4. The method of claim 1 , further comprising:when the load amount of the load is above the sleep level after the sleep delay, operating the motor in a normal state.5. A method for controlling an inverter in a system including an electric load claim 1 , a motor for driving the load claim 1 , and an inverter for operating the motor claim 1 , the method comprising:when a load amount of the load is reduced to below a sleep level, checking whether a time corresponding to a sleep ...

Motor control device, current control method applied to motor control device, and electric power steering device using motor control device

Provided is a motor control device ( 10 ) for controlling a motor ( 5 ) provided with a plurality of sets of windings, in which, when a current control unit ( 23 ) detects a short-circuit failure as a primary failure, the current control unit ( 23 ) continues the control, and, further, when the current control unit ( 23 ) detects a secondary failure, the current control unit ( 23 ) provides control of opening a power supply relay ( 3 ). Accordingly, in a case where a failure of a winding of a motor or an inverter occurs, a torque pulsation is restrained and a sufficient output torque is provided, and further, in a case where a secondary failure occurs, excessive heat generation and current consumption are prevented and the cost of the device is reduced.

POWER SUPPLY APPARATUS OF HOME APPLIANCE

A power supply apparatus of a home appliance which meets standby power regulation of 0.5 watts using one SMPS. As compared with a general circuit which meets the standby power regulation using two or more SMPSs, it may be possible to curtail expenses required for addition of a separate standby only SMPS and miniaturize a PCB, resulting in a reduction in cost. Further, in a washing machine employing a motor, a circuit is provided to bypass a back EMF generated in the motor even if AC power is not supplied to the washing machine due to occurrence of a power failure or unplugging of the washing machine. Therefore, it may be possible to prevent a PCBA from being damaged due to the back EMF. 1. A power supply apparatus of a home appliance , comprising:a power line to supply alternating current (AC) power from an AC power source;first and second rectifiers, each of the first and second rectifiers rectifying the supplied AC power;a main relay connected to an input of the first rectifier to switch the AC power to the first rectifier;a switching mode power supply (SMPS) connected to an output of the second rectifier to generate a direct current (DC) voltage for driving the home appliance based on a rectified voltage from the second rectifier; anda load switch connected to an output of the SMPS to switch the DC voltage from the SMPS.2. The power supply apparatus according to claim 1 , further comprising a filter connected to the power line to remove a noise component of the AC power supplied through the power line.3. The power supply apparatus according to claim 1 , further comprising an inverter connected to an output of the first rectifier to convert a rectified voltage from the first rectifier into a 3-phase AC voltage and supply the converted 3-phase AC voltage to a motor claim 1 ,wherein the first rectifier is connected between the AC power source and the inverter to rectify and smooth the AC power supplied through the power line to output a motor driving voltage.4. The ...

METHOD FOR CONTROLLING AN INVERTER

Provided is a method for controlling an inverter, the method comprising calculating an optimal speed, determining a final speed as the optimal speed when a command speed is higher than a rated speed level of a motor, and determining the final speed as the command speed when the command speed is lower than or equal to the rated speed level, or higher than a predetermined optimal speed level. 1. A method for controlling an inverter , the method comprising:calculating an optimal speed;determining a final speed as the optimal speed when a command speed is higher than a rated speed level of a motor; anddetermining the final speed as the command speed when the command speed is lower than or equal to the rated speed level, or higher than a predetermined optimal speed level.2. The method of claim 1 , further comprising:checking if the motor is in a manual mode when the command speed is lower than or equal to the optimal speed level.3. The method of claim 2 , further comprising:determining the final speed as the command speed when the motor is in a manual mode.4. The method of claim 2 , further comprising:determining the final speed as the optimal speed when the motor is not in a manual mode.5. The method of claim 1 , wherein the calculating the optimal speed comprises:setting a torque limit,accumulating torques during a set time,calculating an average torque, andcalculating the optimal speed using the torque limit, the average torque and the rated speed of the motor.6. The method of claim 5 , wherein the optimal speed is obtained by dividing a multiplication of the rated speed and the torque limit by the average torque.7. The method of claim 5 , wherein the torque limit includes a forward direction torque limit and a backward direction torque limit.8. The method of claim 5 , wherein the calculating the optimal speed further comprises limiting the calculated optimal speed within a maximum frequency range. Pursuant to 35 U.S.C. §119 (a), this application claims the benefit of ...

MOTOR DRIVE APPARATUS EQUIPPED WITH DYNAMIC BRAKING CONTROL UNIT

A motor drive apparatus includes an inverter which has an upper and lower arms each provided with a plurality of semiconductor switching devices and free-wheeling diodes connected in reverse parallel with respective ones of the plurality of semiconductor switching devices, wherein the semiconductor switching devices are controlled on and off to convert DC to AC, a short-circuiting unit which includes a selector switch between motor phase windings of a synchronous motor, the selector switch being opened and closed under the control of a command, and a dynamic braking control unit which, upon reception of a dynamic braking start command, performs control so as to turn on all of the semiconductor switching devices provided in either one of the upper and lower arms and to turn off all of the semiconductor switching devices provided in the other arm, and thereafter controls the short-circuiting unit so that the selector switch is closed. 1. A motor drive apparatus which converts DC to AC to provide drive power for driving a synchronous motor , comprising:a full-bridge inverter which has an upper arm and a lower arm each provided with a plurality of semiconductor switching devices and free-wheeling diodes connected in reverse parallel with respective ones of said plurality of semiconductor switching devices, wherein said semiconductor switching devices provided in said upper arm and said lower arm are controlled on and off to convert DC to AC;a short-circuiting unit which includes a selector switch between motor phase windings of said synchronous motor, said selector switch being opened and closed under the control of a command; anda dynamic braking control unit which, upon reception of a dynamic braking start command, performs control so as to turn on all of said semiconductor switching devices provided in either one of said upper arm and said lower arm and to turn off all of said semiconductor switching devices provided in the other arm, and thereafter controls said ...

Methods, systems and apparatus for generating voltage command signals for controlling operation of an electric machine

Embodiments of the present disclosure relate to methods, systems and apparatus for generating voltage command signals for controlling operation of an electric machine. The disclosed embodiments can reduce current and torque oscillation, which can in turn improve machine efficiency and performance, as well as utilization of the DC voltage source.

OUTPUT CONTROL APPARATUS FOR ELECTRIC MOTOR AND METHOD FOR CONTROLLING OUTPUT OF ELECTRIC MOTOR

An output control apparatus for an electric motor includes a phase-current instruction-value setting device, a draw-current allowable-value storage device, a phase-current allowable-value setting device, and a phase-current instruction-value limiting device. The draw-current allowable-value storage device is configured to store a draw current allowable value of an electric storage device corresponding to an allowable current value of a system disconnecting-connecting device provided in a power system from the electric storage device to the electric motor. The phase-current allowable-value setting device is configured to set a phase current allowable value based on the draw current allowable value and an ON time of a switching element in a power converter. The phase-current instruction-value limiting device is configured to compare the phase current instruction value with the phase current allowable value to limit the phase current instruction value so as not to exceed the phase current allowable value. 1. An output control apparatus for an electric motor , the output control apparatus comprising:a phase-current instruction-value setting device configured to set a phase current instruction value of the electric motor based on a request to the electric motor to which electric power is supplied from at least an electric storage device via a power converter including a switching element;a draw-current allowable-value storage device configured to store a draw current allowable value of the electric storage device corresponding to an allowable current value of a system disconnecting-connecting device provided in a power system from the electric storage device to the electric motor;a phase-current allowable-value setting device configured to set a phase current allowable value based on the draw current allowable value and an ON time of the switching element in the power converter; anda phase-current instruction-value limiting device configured to compare the phase current ...

JUNCTION TEMPERATURE MEASUREMENT OF A POWER MOSFET

A component used as a circuit breaker for a power inverter for actuating a drive motor of a steering support system of a vehicle comprises a MOSFET having a gate, a drain and a source, and a first diode having an anode and a cathode, wherein the diode is provided for measuring the junction temperature of the MOSFET, and wherein the MOSFET is of the n-channel type or p-channel type, and the source is connected to the cathode. 1. A component used as a circuit breaker for a power inverter for actuating a drive motor of the steering support system of a vehicle , comprising:a MOSFET having a gate, a drain and a source, anda first diode having an anode and a cathode, wherein the diode is provided for measuring the junction temperature of the MOSFET, and whereinthe MOSFET is of the n-channel type or p-channel type, and the source is connected to the cathode.2. The component according to claim 1 , wherein the first diode and the MOSFET are disposed on the same semiconductor substrate.3. The component according to claim 1 , wherein the first diode is designed as a silicon diode claim 1 , a suppressor diode claim 1 , a Schottky diode claim 1 , a PIN diode or a Zener diode.4. A component according to claim 1 , wherein the component comprises a second diode and/or a third diode and/or a fourth diode and/or any number of additional diodes claim 1 , wherein the first diode and/or the second diode and/or the third diode and/or the fourth diode and/or any number of additional diodes are connected in series and/or are thermally coupled to the barrier layer of the MOSFET.6. A steering system comprising a power-assisted steering mechanism according to .7. A method for measuring the junction temperature of a MOSFET of a component according to claim 1 , comprising the steps of:{'sub': 'F', 'feeding a constant forward current Iinto the diode; and'}{'sub': 'F', 'measuring the forward voltage Vof the diode.'}8. A method for measuring the junction temperature of a MOSFET of a component ...

Control method for induction motor

In order to cause the residual magnetic flux in an induction motor to decay in a short time without an excessive current flow, an induction motor control apparatus continues an operation in which an inverter apparatus is caused to output a zero voltage to the induction motor for a predetermined time before deactivating an operation of the inverter apparatus.

POWER CONVERSION APPARATUS INCLUDING A PLURALITY OF POWER CONVERSION CIRCUITS AND FILTER CIRCUIT SHARED THEREBY

A power conversion apparatus includes a filter circuit, a power conversion circuit, a first casing and a second casing. An input circuit of the filter circuit is connected to a power source to receive power from the power source. A plurality of power conversion circuits are disposed correspondingly to the electrical loads in which every input circuit of the power conversion circuits is connected to an output circuit of the filter circuit and respective output circuits of the power conversion circuits are correspondingly connected to the electrical loads. The power conversion circuit converts the power from the filter circuit and supplies the converted power to the electrical loads. The first casing accommodates the filter circuit and plural second casings are disposed correspondingly to the plurality of power conversion circuits. Each of the second casings accommodates corresponding power conversion circuit. 1. A power conversion apparatus that converts power transmitted from a power source and supplies a plurality of electrical loads with power converted by the power conversion apparatus , comprising:a filter circuit including an input circuit and an output circuit, the input circuit being connected to the power source and receiving the power transmitted from the power source;a plurality of power conversion circuits each having an input circuit and an output circuit, disposed correspondingly to the plurality of electrical loads, every input circuit of the plurality of power conversion circuits being connected in common to the output circuit of the filter circuit to be shared by the plurality of power conversion circuits and receiving the power transmitted from the filter circuit, respective output circuits of the plurality of power conversion circuits being correspondingly connected to the plurality of electrical loads, each of the power conversion circuits converting the power transmitted from the filter circuit and supplying the power converted by each of the ...

ELECTRICALLY POWERED VEHICLE AND METHOD FOR CONTROLLING THE SAME

A converter is disposed between a first battery and a power line for transmitting power inputted to and outputted from a motor for traveling. A second battery, on the other hand, is connected to the power line with a relay being interposed therebetween. A control unit controls the relay to be turned on or off in accordance with an operating state of the motor. 1. An electrically powered vehicle comprising:a motor for generating vehicle driving force;a first power storage device;a second power storage device;a power line for transmitting power inputted to and outputted from said motor;a converter for carrying out bidirectional DC voltage conversion between said first power storage device and said power line;a switch connected between said second power storage device and said power line; anda control unit for controlling said switch to be turned on or off in accordance with an operating state of said motor.2. The electrically powered vehicle according to claim 1 , whereinsaid control unit calculates a minimum required voltage of said power line in accordance with a torque and a rotation speed of said motor, and turns off said switch when an output voltage of said second power storage device is lower than said minimum required voltage.3. The electrically powered vehicle according to claim 2 , whereinsaid control unit sets a voltage command value of said power line in a range not lower than said minimum required voltage in accordance with the torque and the rotation speed of said motor, and turns on said switch when the output voltage of said second power storage device is higher than said voltage command value, while it turns off said switch when said output voltage is lower than said voltage command value.4. The electrically powered vehicle according to claim 3 , whereinsaid control unit turns off said switch when a voltage difference obtained by subtracting said voltage command value from the output voltage of said second power storage device is greater than a ...

Control electronics for brushless motors

An electronic control circuit for a brushless motor has an input power circuit providing a DC voltage and a microcontroller integrated circuit receiving the DC voltage. The microcontroller integrated circuit provides three-phase control signals according to a space vector control method. A microprocessor connected to the microcontroller integrated circuit executes supervisory control over the electronic control circuit. An inverter circuit receives the three-phase control signals from the microcontroller integrated circuit and provides driving signals to the brushless motor based on the three-phase control signals received from the microcontroller integrated circuit.

THREE-PHASE INVERTER FOR DRIVING AN ELECTRIC MOTOR

A three-phase inverter for driving a three-phase electric motor includes three half-bridges. Each half-bridge has a first and a second transistor. A first and a second control voltage are applicable for providing phases to the three-phase electric motor. The first and second transistors are configured to be normally-on. Each half-bridge also has a third transistor connected in series with the first transistor and a fourth transistor connected in series with the second transistor. The third and fourth transistors are arranged to operatively receive the first and second control voltages, respectively. 1. A three-phase inverter for driving a three-phase electric motor , the three-phase inverter comprising:three half-bridges, each half-bridge comprising a first and a second transistor, and each half-bridge arranged to provide a phase to the three-phase electric motor using the first and second transistors, wherein a first and a second control voltage are applicable for providing the phase to the three-phase electric motor, and the first and second transistors are configured to be normally-on;wherein each half-bridge further comprisesa third transistor configured to be normally-off, wherein the third transistor is connected in series with the first transistor such that a drain of the third transistor is connected to a source of the first transistor, anda fourth transistor configured to be normally-off, wherein the fourth transistor is connected in series with the second transistor such that a drain of the fourth transistor is connected to a source of the second transistor;wherein the third and fourth transistors are arranged to operatively receive the first and second control voltages, respectively, thereby each half-bridge is arranged to provide the phase to the three-phase electric motor.2. The three-phase inverter according to claim 1 , wherein the first transistor is a first silicon carbide transistor and the second transistor is a second silicon carbide transistor.3 ...

CONTROL DEVICE FOR ROTATING ELECTRICAL MACHINE

According to typical examples, the first stator winding having the lower rated voltage is connected to the second direct-current voltage source only when the rotation speed of the rotating electrical machine becomes high. Therefore, output in a high-rotation range can be ensured while preventing the second stator winding from reaching a heat-generation limit. Furthermore, such switching operations can be actualized by the first switch and the second switch. Therefore, a control device of a rotating electrical machine can be actualized by a relatively simple configuration. 1. A control device of a rotating electrical machine , wherein the control device is provided with a first stator winding and a second stator winding that has a greater rated voltage than the first stator winding , the first stator winding and the second stator winding being insulated from each other , comprising:a first inverter that is connected to the first stator winding;a second inverter that is connected to the second stator winding;to a controller that operates the first inverter and the second inverter to control a current and voltage of the rotating electrical machine;a first switch for switching a first state and a second state, wherein the first state is a state that the first inverter and the second inverter is electrically connected to a second direct voltage source, and the second state is a state that only the second inverter is electrically connected to the second direct voltage source; anda second switch for connecting or disconnecting the first inverter to and from a first direct-current voltage source whose potential voltage is lower than that of the second direct-current voltage source;whereinthe controller performs i) an operation to switch the first switch to an open state and switch the second switch to a closed state when a rotation speed of the rotating electrical machine is low, and ii) an operation to switch the first switch to a closed state and the second switch to an ...

Power Converting Apparatus

Provided is a power converting apparatus which suppresses noise caused by a square wave voltage that is sharply changed according to switching of the power converting apparatus. 1. A power converting apparatus comprising:a first inverter circuit connected to a DC power supply side; anda second inverter circuit connected to a load side,wherein the first inverter circuit converts DC power from the DC power supply into power having an absolute waveform of an AC waveform, andthe second inverter circuit converts the power of the absolute waveform every single cycle thereof into AC power by alternately inverting the power.2. The power converting apparatus according to claim 1 , further comprising:a control circuit which controls the first inverter circuit and the second inverter circuit,wherein the second inverter circuit has two series circuits in which an upper arm and a lower arm constituted by switching elements are connected in series, andthe control circuit performs control to alternately switch conductions of the upper arm and the lower arm of the series circuits every single cycle of the power of the absolute waveform.3. The power converting apparatus according to claim 1 ,wherein the first inverter circuit includes a first series circuit portion in which a first switching element and an inductor are connected in series, and a second series circuit portion in which a second switching element and a capacitor are connected in series,the second series circuit portion is connected to the inductor of the first series circuit portion in parallel, anda voltage of the capacitor is output as a voltage of the absolute waveform by conductions of the first switching element and the second switching element.4. The power converting apparatus according to claim 2 ,wherein the control circuit alternately switches the conductions of the upper arm and the lower arm included in the second inverter circuit in a case where the voltage of the capacitor becomes substantially 0.5. The ...

Hybrid Electric Vehicle System and Method of Controlling The Same

The present invention is directed to a method of estimating a motor rotation angle that does not affect precision of a detected angle of a crank angle sensor, which is an alternative sensor, when abnormality occurs in a resolver and a peripheral circuit, and performing a motor control without failure of an inverter or peripheral device. A vehicle system includes a motor, a resolver detecting a rotor rotation angle of the motor, a motor control circuit controlling the motor based on information on rotor rotation angle and torque command value, an engine connected to the motor through a crankshaft, and a crankshaft sensor detecting revolutions of the crankshaft, in which the motor control circuit estimates rotor rotation angle based on a variation rate of the number of revolutions of the crankshaft when abnormality of the resolver is detected, and performs a weak field control based on estimated rotor rotation angle. 1. A hybrid vehicle system , comprising:an inverter circuit having a switching element which converts a direct current into an alternate current;a motor for driving a vehicle which receives the alternate current to be driven;a resolver which detects a rotor rotation angle of the motor;a control circuit which controls a switching operation of the switching element based on information on the rotor rotation angle and a torque command value;an engine connected to the motor through a crankshaft; anda crankshaft sensor which detects a rotation angle and the number of revolutions of the crankshaft,wherein, when abnormality of the resolver is detected, the control circuit estimates the rotor rotation angle based on a difference between the present number of revolutions of the crankshaft and the number of revolutions of the crankshaft, which is detected a specified time before, and performs motor control including a weak field control based on the estimated rotor rotation angle.2. The hybrid vehicle system according to claim 1 , wherein the estimated rotor ...

PITCH MOTOR DRIVE CIRCUIT WHICH CAN OPERATE IN EMERGENCY MODE

The invention relates to a pitch drive circuit (), which can operate in emergency mode, for a wind or water power plant (), said circuit comprising at least one rectifier unit (), at least one DC intermediate circuit (), two inverter units (--) and a pitch rotary current motor () with motor trains () which can be contacted on both sides. A first contact side (-) of the motor trains () is connected to a first inverter unit (-) and a second contact side (-) of the motor trains () is connected to a second inverter unit (-). At least one switching element () is connected to at least one contact side () of the motor trains (). In a normal operating mode of a first switching state of the switching element (), the motor trains () can be energized by means of both inverter units (--), and in an emergency operating mode of a second switching state of the switching element (), the motor trains () can be energized by means of a single inverter unit (). The invention further relates to a pitch drive device which is energized by an aforementioned drive circuit. Finally, the invention relates to a method for operating the pitch drive circuit which can operate in emergency mode. 115-. (canceled)16. Pitch drive circuit which can operate in emergency mode for a wind or water turbine system , comprising:at least one rectifier unit,at least one DC intermediate circuit,a first inverter unit and a pitch three-phase motor with motor trains that can be contacted on both sides, where a first contact side of the motor trains is connected to the first inverter unit, a second contact side of the motor trains is connected to a second inverter unit and at least one switching element is connected to at least one contact side of the motor trains, so that during normal operation of a first switching state of the switching element the motor trains can be supplied with current by both inverter units, and in an emergency operation of a second switching state of the switching element the motor trains ...

POWER INVERTER SUITABLE FOR A VEHICLE

A power inverter comprises at least a box-shaped housing; and a power module, a smoothing capacitor, a base plate made of a flat plate, and a rotating electric machine control circuit board arranged in order in the housing. The base plate is arranged with the fringes fixed to the inner wall surfaces of the housing, and the smoothing capacitor and rotating electric machine control circuit board are fixed. 1. A power inverter , comprising:a power module for outputting AC current to a motor;a control circuit board for controlling the motor;a housing for installing the power module;a base member for holding the control circuit board,wherein the housing has a plurality of convex parts on an inner surface thereof,the base member is supported by end surfaces of the convex parts, andthe housing and the base member are made of aluminum.2. The power inverter according to claim 1 , further comprising a cover claim 1 ,wherein the housing forms an opening which is closed by the cover, andthe convex parts are formed toward the opening.3. The power inverter according to claim 1 , further comprising:a cover;an electric circuit different from the control circuit board; anda harness connected to the electric circuit,wherein the housing forms an opening which is closed by the cover,the control circuit board is placed in a first space which is one of spaces separated by the base member,the electric circuit is placed in a second space which is the other of spaces separated by the base member,the base member is formed to look larger than the control circuit board when seen in a direction perpendicular to an opening surface defined by a rim of the opening,the harness extends from the second space to the first space,the harness is placed to overlap the base member when seen in a direction perpendicular to the opening surface.4. The power inverter according to claim 1 ,wherein the base member forms a concave at a portion facing to a wiring layer of the control circuit board.5. The power ...

SYSTEM FOR COUPLING AT LEAST ONE DC SOURCE TO A CONTROLLABLE ENERGY STORE AND ASSOCIATED OPERATING METHOD

The invention relates to a system for coupling at least one DC source () to a controllable energy store (), which is used for controlling and supplying electrical energy to an n-phase electric machine (), where n≧1. In this case, the controllable energy store () has n parallel energy supply branches (---), which are connectable firstly to a reference rail (T−) and secondly to in each case one phase (U, V, W) of the electric machine (). An intermediate circuit () is connectable on the output side via a controllable coupling circuit () to the energy supply branches (---) of the controllable energy store () and on the input side to the at least one DC source (). An associated operating method provides for a current flow from the at least one DC source () into the energy supply branches (---) of the controllable energy store () or the phases (U, V, W) of the electric machine () to be controlled with the aid of the controllable coupling circuit ().

APPARATUS AND METHOD FOR HIGH EFFICIENCY OPERATION OF FUEL CELL SYSTEMS

A drive circuit comprising a DC bus configured to supply power to a load, a first fuel cell coupled to the DC bus and configured to provide a first power output to the DC bus, and a second fuel cell coupled to the DC bus and configured to provide a second power output to the DC bus supplemental to the first fuel cell. The drive circuit further includes an energy storage device coupled to the DC bus and configured to receive energy from the DC bus when a combined output of the first and second fuel cells is greater than a power demand from a load, and provide energy to the DC bus when the combined output of the first and second fuel cells is less than the power demand from the load. 1. A drive circuit comprising:a DC bus;a voltage converter assembly coupled to the DC bus;a first fuel cell coupled to the voltage converter assembly;a second fuel cell coupled to the voltage converter assembly; and operate the first fuel cell to deliver a first power output to the voltage converter assembly during a first mode of operation and deliver a second power output to the voltage converter assembly during a second mode of operation, the second power output different from the first power output; and', 'operate the second fuel cell to deliver a third power output to the voltage converter assembly during the first and second modes of operation., 'a controller programmed to2. The drive circuit of wherein the first and second power outputs are greater than zero.3. The drive circuit of wherein the controller is further programmed to:control the first fuel cell to supply the first output power at a non-varying rate; andsimultaneously control the second fuel cell to supply the third output power at a varying rate.4. The drive circuit of wherein the controller is further programmed to implement an on/off sequencing of the second fuel cell to cause the second fuel cell to supply the third output power at the varying rate.5. The drive circuit of further comprising an energy storage device ...

Ac motor drive device

A circuit disconnection element that can open or short-circuit between a power storage element and a step-up/step-down bidirectional chopper circuit is provided in a power storage system, thereby preventing a self-discharge state in a process of charging. Furthermore, at the time of occurrence of an abnormality, the power storage element is detached from other devices including the step-up/step-down bidirectional chopper circuit. Accordingly, an energy loss of the power storage element at the time of power regeneration can be reduced to improve the energy use efficiency. Further, breakage influences such that the power storage element causes breakage in other devices at the time of occurrence of the abnormality can be prevented, thereby enabling to obtain an AC motor drive device having mounted therein a highly safe power storage system.

POWER SUPPLY SYSTEM COMPRISING A MULTIPHASE MATRIX CONVERTER AND METHOD FOR OPERATING SAME

A power supply system having a multiphase matrix converter and a method for operating the system are proposed. The converter has a plurality of input and output terminals and a plurality of sub-converters. The input terminals are respectively connected to the output terminals via bidirectional switches of the sub-converters. A circuit has at latest one DC source, an inverter connected in series with the DC source to generator a first alternating voltage, and an HF transformer connected in series with the inverter and connected to each of the input terminals. The HF transformer transforms the first alternating voltage up into a second alternating voltage and changes the frequency of the second alternating voltage by a multiple as compared with frequency of the first alternating voltage. A control unit activates the bidirectional switches as a function of the second alternating voltage present on the output of the HF transformer. 113.-. (canceled)14. A power supply system , comprising:a multiphase matrix converter;an input terminal;an output terminal;a sub-converter;a DC source;an inverter connected with the DC source to generate a first alternating voltage;an HF transformer connected with the inverter and the input terminal; anda control unit,wherein the input terminal is connected to the output terminal via a bidirectional switch of the sub-converter;wherein the HF transformer transforms the first alternating voltage up into a second alternating voltage and changes a frequency of the second alternating voltage by a multiple as compared with a frequency of the first alternating voltage; andwherein the control unit activates the bidirectional switch as a function of the second alternating voltage present at an output of the HF transformer.15. The power supply system as claimed in claim 14 , further comprising a plurality of input terminals claim 14 , a plurality of output terminals claim 14 , a plurality of sub-converters claim 14 , and a plurality of DC sources claim ...

Hybrid-type construction machine

A hybrid-type construction machine is provided which permits swing operation without a sense of awkwardness compared with conventional construction machines and which allows the amount of stored electricity in an electrical storage device to be controlled within an appropriate range of use in consideration of the service life of the electrical storage device without enlarging its capacity. The hybrid-type construction machine includes an electric motor and a hydraulic motor for driving a swing structure, an electrical storage device, and a controller for controlling charging and discharging of the electrical storage device. The controller includes a storage unit which stores a discharge command region to be set in accordance with the swing speed of the swing structure with regard to the amount of stored electricity in the electrical storage device, and a computing unit which, if the amount of stored electricity in the electrical storage device reaches the discharge command region stored in the storage unit, computes an additional drive torque command value for increasing the amount of powering of the electric motor in accordance with the amount of stored electricity in the electrical storage device, the computing unit further outputting the additional drive torque command value to the electric motor to drive the swing structure.

MOTOR CONTROL APPARATUS AND ELECTRIC POWER STEERING APPARATUS USING THE SAME

A motor control apparatus includes an A/D converter, which is a hardware part for converting an analog signal of a sensor to a digital signal, a microcomputer, which is a software part, and a drive circuit, which is a hardware part for driving an inverter to supply electric power to a motor. The microcomputer includes calculation blocks, each of which is a calculation block for individually calculating an output from an input. The microcomputer further executes, in parallel to control calculations, software monitor processing for each calculation block to monitor whether the control calculation is executed normally. The motor control apparatus thus can detect a software abnormality without using a monitoring hardware circuit separately. 1. A motor control apparatus for a motor , the motor control apparatus comprising:a drive circuit for driving the motor;an A/D converter for converting an analog signal of a sensor, which detects an operating condition of the motor, into a digital signal; anda microcomputer programmed to calculate a control amount for driving the motor by executing a control software based on the digital signal inputted from the A/D converter and output a calculated control amount to the drive circuit,wherein the microcomputer is further programmed to execute a software monitor processing, which monitors whether calculation of the control amount is executed normally, in parallel to the calculation of the control amount.2. The motor control apparatus according to claim 1 , wherein:the microcomputer executes a control software formed of a plurality of calculation blocks, each of which calculates an output from an input thereof; andthe microcomputer executes the software monitor processing with respect to each of the calculation blocks.3. The motor control apparatus according to claim 2 , wherein:each of the calculation blocks is provided to calculate the control amount for driving the motor.4. The motor control apparatus according to claim 2 , wherein: ...

POWER CONVERTER

A power converter includes an output circuit and a control circuit. The output circuit has an upper switching device connected to a direct-current power source and a lower switching device connected in series with the upper switching device. The output circuit supplies power to a load from a connection point between the switching devices. The control circuit supplies pulse-modulated control signals to the switching devices to turn ON and OFF the switching devices. The control circuit variably sets a switching speed and a dead-time of the switching devices in such a manner that as the switching speed becomes slower, the dead-time becomes longer. 1. A power converter comprising:an output circuit including a upper switching device connected to a direct-current power source and a lower switching device connected in series with the upper switching device, the output circuit configured to supply power to a load from a connection point between the switching devices; anda control circuit configured to supply pulse-modulated control signals to the switching devices to turn ON and OFF the switching devices, whereinthe control circuit variably sets a switching speed and a dead-time of the switching devices, the dead-time being defined as a time period where both of the switching devices are kept OFF,when the switching speed is set to a first speed, the dead-time is set to a first time length, andwhen the switching speed is set to a second speed faster than the first speed, the dead-time is set to a second time length shorter than the first time length.2. The power converter according to claim 1 , further comprising:a temperature sensor configured to detect a temperature of each switching device, whereinwhen the temperature is lower than a predetermined threshold temperature, the switching speed is set to the first speed, and the dead-time is set to the first time length, andwhen the temperature is not lower than the threshold temperature, the switching speed is set to the ...

ASSYMETRICAL POWER INVERTER

An exemplary inverter includes first, second and third legs connected in parallel to a line rail and a neutral rail. Each leg includes a first switch, a second switch, and a node between the first and second switches. The first leg further includes a voltage boosting section operable to selectively increase and decrease the voltage potential of the node of the first leg. The voltage boosting section may include a capacitor in parallel with the first and second switches. The first leg may further include a third switch in series with the voltage boosting section and between the voltage boosting section and the line rail, and a fourth switch in series with the voltage boosting section and between the voltage boosting section and the neutral rail. 1. A system comprising:a variable frequency drive including a rectifier, a DC bus, and an inverter, the inverter including a plurality of inverter legs; andan electric motor operatively connected with the inverter, the motor including a main winding and an auxiliary winding, the main winding connected with a first leg of the inverter at a first main winding node and connected with a second leg of the inverter at a second main winding node, the auxiliary winding connected with a third leg of the inverter at a first auxiliary winding node and connected with the second leg of the inverter at a second auxiliary winding node;wherein the third leg of the inverter includes a plurality of switching devices and a capacitor selectably electrically connectable with the first auxiliary winding node by switching one or more of the switching devices.2. A system according to wherein the third leg of the inverter comprises a first switching device claim 1 , a second switching device claim 1 , a third switching device claim 1 , and a fourth switching device connected in series between a first rail of the DC bus and a second rail of the DC bus; the capacitor is connected to a first inverter node between the first switching device and the ...

INVERTER CONTROL APPARATUS AND CONTROL METHOD THEREOF

An inverter control apparatus and a control method thereof are provided. The inverter control apparatus and a control method thereof stably operate a three-phase motor using a capacitor having a small capacitance for a DC link. The inverter control apparatus includes a current sensor to sense an output current of the inverter, a voltage sensor to sense a DC-link voltage of the inverter, and a controller to generate an average of a periodically varying rotor based q-axis current boundary value based on the output current and the DC-link voltage to generate a current reference on the basis of the average of the rotor based q-axis current boundary value, and to drive a three-phase motor based on the current reference. Stabilized variable speed control of a motor by using a small-capacitance capacitor for a DC link of an inverter is performed and reliability of an inverter circuit improved. 1. An inverter control apparatus that controls an inverter having a DC-link voltage pulsating at double a system frequency , the inverter control apparatus comprising:a current sensor to sense an output current of the inverter;a voltage sensor to sense a DC-link voltage of the inverter; anda controller to generate an average of a periodically varying rotor based q-axis current boundary value on a basis of the output current and the DC-link voltage, to generate a current reference on a basis of the average of the rotor based q-axis current boundary value, and to drive a three-phase motor on the basis of the current reference.2. The inverter control apparatus according to claim 1 , wherein the controller comprises:a velocity controller to generate an output torque command value on the basis of the output current; anda current reference generator to generate the current reference corresponding to the output torque command value.3. The inverter control apparatus according to claim 2 , wherein the current reference generator comprises a system angle estimator to estimate at least one of a ...

Inverter Device

The present invention includes: an electrolytic capacitor that smoothes a rectified voltage to a direct voltage; an inverter circuit that generates an alternating voltage from the direct voltage, to drive an electric motor; a controlling device that controls drive of switching elements included in the inverter circuit; and a temperature measuring device that measures a temperature of the electrolytic capacitor, to output the measured temperature to the controlling device, in which, when the temperature obtained by the temperature measuring device is lower than a predetermined target temperature, the controlling device supplies the electric motor with a current which is restricted so that a ripple voltage of the direct voltage falls within an allowable range, before starting a normal operation of the electric motor, so that the temperature of the electrolytic capacitor is raised to the target temperature. Thus, the electrolytic capacitor can be used even in a lower-temperature environment. 1. An inverter device comprising:an electrolytic capacitor that smoothes a rectified voltage to a direct voltage;an inverter circuit that generates an alternating voltage from the direct voltage, to drive an electric motor;a controlling device that controls drive of a plurality of switching elements included in the inverter circuit; anda temperature measuring device that measures a temperature of the electrolytic capacitor, to output the measured temperature to the controlling device,wherein, when the temperature obtained by the temperature measuring device is lower than a predetermined target temperature, the controlling device supplies the electric motor with a current which is restricted so that a ripple voltage of the direct voltage falls within an allowable range, before starting a normal operation of the electric motor, so that the temperature of the electrolytic capacitor is raised to the target temperature.2. The inverter device according to claim 1 , wherein claim 1 , ...

Control System And Method

Embodiments of the present invention relate to an a method, apparatus and computer program product for controlling the operation of a drive unit comprising a plurality of switching modules arranged to receive a DC electricity supply and generate an AC electricity supply for driving a load from the received DC electricity supply, the AC electricity supply being generated by the switching of the plurality of switching modules between a conducting state and a non-conducting state. The method comprises receiving one or more characteristics associated with each of the switching modules, comparing, for each switching module of the plurality of switching modules, a characteristic of the switching module with an equivalent characteristic associated with one or more other switching modules of the plurality of switching modules, and controlling a time period during which one or more of the plurality of switching modules are in the conducting state in accordance with a result of the comparison. 1. A method for controlling the operation of a drive unit comprising a plurality of switching modules arranged to receive a DC electricity supply and generate an AC electricity supply for driving a load from the received DC electricity supply , the AC electricity supply being generated by switching of the plurality of switching modules between a conducting state and a non-conducting state , the method comprising:receiving one or more characteristics associated with each of the switching modules;comparing, for each switching module of the plurality of switching modules, a characteristic of the switching module with an equivalent characteristic associated with one or more other switching modules of the plurality of switching modules; andcontrolling a time period during which one or more of the plurality of switching modules are in the conducting state in accordance with a result of the comparison.2. The method according to claim 1 , wherein controlling the time period during which one or ...

MOTOR DRIVING DEVICE AND ELECTRIC POWER STEERING APPARATUS INCLUDING MOTOR DRIVING DEVICE

In a motor driving device, a first relay portion is connected between a power source and an inverter portion, a second relay portion is connected between the first relay portion and the inverter portion, and a motor relay portion is connected between the inverter portion and a winding group of a motor. Inverter pre-driver circuits respectively drive switching elements of the inverter portion. A first pre-driver circuit drives the first relay portion. A second pre-driver circuit drives the second relay portion and the motor relay portion. A controller controls driving of the inverter portion, the first relay portion, the second relay portion, and the motor relay portion, and detects a failure of the first relay portion, the second relay portion, and the motor relay portion. 1. A motor driving device comprising:an inverter portion including a plurality of switching elements that switches power supply to a winding group of a motor;a first relay portion connected between a power source and the inverter portion;a second relay portion connected between the first relay portion and the inverter portion;a motor relay portion connected between the inverter portion and the winding group of the motor;a plurality of inverter pre-driver circuits respectively driving the plurality of switching elements of the inverter portion;a first pre-driver circuit driving the first relay portion;a second pre-driver circuit driving the second relay portion and the motor relay portion; anda controller including a control section and a failure detecting section, the control section controlling driving of the inverter portion, the first relay portion, the second relay portion, and the motor relay portion through the plurality of inverter pre-driver circuits, the first pre-driver circuit, or the second pre-driver circuit, the failure detecting section detecting a failure of the first relay portion, the second relay portion, and the motor relay portion.2. The motor driving device according to claim ...

Methods and apparatuses for controlling output voltages of inverters driving electric motors

A method of controlling an output voltage of an inverter driving an electric motor may include calculating a current total harmonic distortion (THD) of a current output to the electric motor; comparing the current THD with a reference current THD; determining a pulse width modulation (PWM) method to be changed from a first modulation method that reduces harmonic components of the current output to the electric motor to a second modulation method when the current THD is less than the reference current THD, the PWM method modulating a pulse width of a control pulse signal for controlling the output voltage of the inverter; and/or generating the control pulse signal based on the determined PWM method.

DRIVE CONTROL DEVICE AND DRIVE CONTROL METHOD

The invention provides a drive control device that comprises: inverters that are connected to a motor; a variable resistive element that is connected between the motor and each of the inverters; a current/voltage detection device connected between the motor and each of the inverters; and a controller that, when detecting a fault of an inverter that drives the motor based on a detection signal from the current/voltage detection device, gradually increases a resistance value of a variable resistive element provided between the faulty inverter and the motor at a velocity of a resistance variation such that a surge voltage has a voltage value for which the variable resistive element and the motor are not damaged, and executes drive control of the motor by a normal inverter other than the faulty inverter. 1. A drive control device comprising:a plurality of inverters that are each connected to a motor and capable of driving the motor;a variable resistive element that is connected between the motor and each of the inverters, and has its resistance value capable of being externally and variably controlled;an output detection unit that is connected between the motor and each of the inverters, and detects at least one of an output current and an output voltage of each of the inverters; anda controller that, when detecting a fault of an inverter that drives the motor based on a detection signal from the output detection unit, stops an operation of the faulty inverter, gradually increases a resistance value of the variable resistive element provided between the faulty inverter and the motor at a velocity of a resistance variation such that a surge voltage generated due to an inductance component of a circuit including the motor and the faulty inverter has a voltage value for which the variable resistive element and the motor are not damaged, and executes drive control of the motor using a normal inverter other than the faulty inverter.2. The drive control device according claim ...

POWER CONVERTER FOR AN ELECTRICAL MACHINE AND METHOD OF OPERATING THE MACHINE

A power converter has a first electrical circuit including a direct current (dc) voltage source, a first phase winding of an electrical machine, and a first switch operating in a conductive state. A second electrical circuit includes the first phase winding, a first unidirectional current device, and a capacitive storage element. A third electrical circuit includes the capacitive storage element, a second switch operating in a conductive state, and the first phase winding. A fourth electrical circuit includes the first phase winding, the dc voltage source, and a second unidirectional current device. 1. A power converter comprising:a capacitive storage element;first and second switches that each conducts current in a conductive state and does not conduct current in a non-conductive state; andfirst and second unidirectional current devices that each conducts current unidirectionally, wherein: a first operational state exists in which energy is transferred from the dc voltage supply to the first phase winding when the first switch is in the conductive state,', 'a second operational state exists in which energy stored by the first phase winding during the first operational state is transferred to the capacitive storage element when the first switch is in the non-conductive state,', 'a third operational state exists in which energy stored by the capacitive storage element is transferred to the first phase winding when the second switch is in the conductive state, and', 'a fourth operational state exists in which energy stored by the first phase winding during the third operational state is transferred to dc voltage supply when the second switch is in the non-conductive state., 'the capacitive storage element, first and second switches, and first and second unidirectional current elements are interconnected such that when interconnected with a direct current (dc) voltage supply and a first phase winding of an electrical machine2. The power converter of claim 1 , wherein: ...

CONTROL DEVICE AND METHOD FOR OPERATING AN ELECTRICAL MACHINE DRIVEN BY AN INVERTER

The invention relates to a method for operating an electrical machine () controlled by an inverter (), wherein the inverter () comprises half-bridge branches (-U, -V, -W) having power components in the form of controllable power switching elements () and power diodes () respectively connected in parallel therewith, wherein each of the half-bridge branches (-U; -V; -W) is arranged on a separate semiconductor module (-U; -V; -W), which are arranged jointly on a baseplate (), wherein the phase currents (1_U, 1_V, 1_W) flowing through the half-bridge branches (-U, -V, -W), the voltages present at the power components and temperatures (t_Sens_U, t Sens_V, t_Sens_W) on the semiconductor modules (-U, -V, -W) are determined, from the current (1_U; 1_V; 1_W) respectively flowing at a power component and from the voltage respectively present a power loss (P) is calculated for each of the power components, from the power losses (P) a relevant temperature swing (Δt; Δt_Sens) is determined for each of the power components and for temperature sensors (-U, -V, -W) serving to determine the temperatures on the semiconductor modules, a temperature (TempCooler) of the baseplate () is determined from the determined temperatures (t_Sens_U, t_Sens_V, t_Sens_W) on the semiconductor modules (--V, -W) and the determined temperature swings (Δt_Sens) at the temperature sensors (-U, -V, -W), and a torque or a power of the electrical machine () is determined in a manner dependent on the determined temperature swings (Δt) and the determined temperature (TempCooler) of the basplate (). 1. A method for operating an n-phase electrical machine , where n≧1 , controlled by an inverter , wherein the inverter comprises n half-bridge branches having power components in the form of controllable power switching elements and power diodes respectively connected in parallel therewith , wherein each of the half-bridge branches is arranged on a separate semiconductor module , which are arranged jointly on a ...

Method for controlling electric drive and electric drive

A method for controlling an electric drive, having an inverter, an electric motor and control means configured in a first operating state of the electric drive to control the electric drive to run in a constant operating point, determine and store a value of an output voltage of the inverter or a value of a flux reference of the inverter, and a value of a switching frequency of the inverter with which a determined input power of the electric drive is lowest. The controller is configured in a second operating state of the electric drive to control the electric drive to use the stored values to run in the operating point.

Motor driving unit

A motor driving unit ( 1 ) includes a controller ( 15 ) that performs driving control of a motor ( 3 ) by controlling an inverter ( 11 ). During regeneration of the motor ( 3 ), the controller ( 15 ) performs output stopping control for causing the inverter ( 11 ) to stop an output, when an inter-terminal voltage of a capacitor ( 12 ) is equal to or greater than a first threshold value. The controller ( 15 ) performs output restarting control for causing the inverter ( 11 ) to restart the output, when the inter-terminal voltage of the capacitor ( 12 ) is equal to or smaller than a second threshold value which is smaller than the first threshold value. The controller ( 15 ) performs regenerative braking by allowing the output stopping control and the output restarting control to be repeatedly performed.

CRANE APPARATUS, CONTAINER YARD, AND FEEDING METHOD

A three-phase full-wave rectifier () performs full-wave rectification of three-phase AC power (A) supplied from ground power supply equipment, and supplies obtained DC power (A) to a common bus (B). A Δ-Y connection type three-phase transformer () outputs three-phase AC power (B) of a voltage phase shifted by π/6 from the three-phase AC power (A). A three-phase full-wave rectifier () performs full-wave rectification of the three-phase AC power (B) output from the three-phase transformer (), and supplies obtained DC power (B) to the common bus (B). 1. A crane apparatus comprising:a first three-phase full-wave rectifier configured to perform full-wave rectification of first three-phase AC power supplied from ground power supply equipment, and to supply obtained DC power to a common bus;a three-phase transformer configured to output second three-phase AC power of a voltage phase shifted by π/6 from the first three-phase AC power;a second three-phase full-wave rectifier configured to perform full-wave rectification of the second three-phase AC power output from said three-phase transformer, and to supply obtained DC power to the common bus; anda motor configured to be driven to hoist and lower a container based on the DC powers supplied from said first and second three-phase full-wave rectifiers to the common bus.2. The crane apparatus according to claim 1 , wherein said three-phase transformer is constituted by a three-phase transformer of one of a Δ-Y connection type and a Y-Δ connection type.3. A container yard comprising:feeder lines extending in a mounting place of a container and configured to feed operating power to a crane apparatus which performs handling of the container; anda plurality of three-phase transformers provided for said respective feeder lines, and configured to transform a voltage of power-supply power supplied from host power supply equipment, and to supply obtained operating power to said feeder lines,wherein one of two paired three-phase ...

POWER SUPPLY SYSTEM

A a more efficient power supply system comprises a rectifier, a low voltage inverter, and a low voltage actuator, the rectifier converting a mains AC voltage into a low input DC voltage, the low voltage inverter connected to the rectifier and converting the low input DC voltage into a low supply AC voltage, and the low voltage inverter connected to the low voltage actuator to supply the low voltage actuator with power via the low supply AC voltage. A DC-DC converter connected to the rectifier converts the low input DC voltage into an extra-low DC voltage. An extra-low voltage inverter connected to the DC-DC converter converts the extra-low DC voltage into an extra-low supply AC voltage. The extra-low voltage inverter connected to an extra-low voltage actuator supplies the extra-low voltage actuator with power via the extra-low supply AC voltage. 1. A power supply system , comprising a rectifier , a low voltage inverter , and a low voltage actuator , the rectifier-being designed to convert a mains AC voltage into a low input DC voltage , the low voltage inverter being connected to the rectifier and designed to convert the low input DC voltage into a low supply AC voltage , and the low voltage inverter being connected to the low voltage actuator in order to supply the low voltage actuator with power via the low supply AC voltage , wherein a DC-DC converter is provided which is connected to the rectifier and designed to convert the low input DC voltage into an extra-low DC voltage , wherein an extra-low voltage inverter is provided which is connected to the same DC-DC converter and designed to convert the extra-low DC voltage into an extra-low supply AC voltage , and wherein the extra-low voltage inverter is connected to an extra-low voltage actuatorin order to supply the extra-low voltage actuator with power via the extra-low supply AC voltage.2. The power supply system according to claim 1 , wherein the DC-DC converter is connected to the low voltage inverter via a ...

ROTARY MACHINE DRIVING SYSTEM AND VEHICLE

A rotary machine driving system includes: a rotary machine including a plurality of coils; an inverter device configured to operate the rotary machine at a variable speed, including a control device for controlling power conversion by an inverter circuit, and a coil switching device for switching a connection of the coils according to the control device. The control device commands the coil switching device to switch the connection of the coils when rotation of the rotary machine transitions between a low-speed rotation range and a high-speed rotation range due to acceleration and deceleration. A starting end and a terminal end of at least one set of coils per phase of the rotary machine are drawn out in a freely connectable state. The coil switching device includes at least one movable portion driven by one actuator. 1. A rotary machine driving system comprising:a rotary machine including a plurality of coils;an inverter device configured to operate the rotary machine at a variable speed, the inverter device including an inverter circuit configured to convert DC power from a DC power supply into AC power and a control device configured to control power conversion by the inverter circuit, anda coil switching device configured to switch a connection of the plurality of coils according to a command from the control device, whereinthe control device commands the coil switching device to switch the connection of the coils when rotation of the rotary machine transitions between a low-speed rotation range and a high-speed rotation range due to acceleration and deceleration,a starting end and a terminal end of at least one set of coils per phase of the rotary machine are drawn out in a freely connectable state,the coil switching device includes at least one movable portion driven by one actuator,the movable portion includes a first short-circuit portion configured to short-circuit at least two starting ends, a second short-circuit portion configured to short-circuit at ...

EXTENDED BRAKING WITH VARIABLE FREQUENCY DRIVE WITHOUT INPUT POWER

A variable frequency drive system () includes a power converter () with a plurality of power cells supplying power to one or more output phases (A, B, C), a main power source () for providing main input power to the power converter (), an auxiliary power source () for providing auxiliary input power to the power converter (), and a control system () in communication with the power converter () and controlling operation of the plurality of power cells, wherein the control system () comprises one or more processor(s) () configured via computer executable instructions to detect a main input voltage drop of the main power source () below a predefined power threshold, disconnect the main power source () in response to the main input voltage drop, and enable the auxiliary power source () to provide auxiliary input power to the power converter () in response to the main input voltage drop. 120.-. (canceled)21. A variable frequency drive system comprising:a power converter comprising a plurality of power cells supplying power to one or more output phases,a main power source configured to provide main input power to the power converter,an auxiliary power source configured to provide auxiliary input power to the power converter, anda control system in communication with the power converter and controlling operation of the plurality of power cells, detect a main input voltage drop of the main power source below a predefined power threshold,', 'disconnect the main power source in response to the main input voltage drop, and', 'enable the auxiliary power source to provide auxiliary input power to the power converter in response to the main input voltage drop., 'wherein the control system comprises at least one processor and is configured via computer executable instructions to'}22. The variable frequency drive system as claimed in claim 21 , wherein the main input power comprises input voltage and the predefined power threshold comprises an input voltage threshold claim 21 , the ...

WORK MACHINE

A work machine prevents a fault in a swing electric motor if an uneven coil temperature increase occurs in the swing electric motor during swing press and related operations. An electricity storage device is connected to the electric motor. An inverter drives the electric motor and a swing control lever issues a command to drive the swing structure. A rotational speed detecting device detects swing speed of the swing structure and a controller controls torque of the electric motor. The controller reads the swing speed of the swing structure detected by the rotational speed detecting device to control such that, when the swing speed is zero, the torque of the electric motor is smaller than a maximum torque value and, when the swing speed is a first rotational speed higher than zero, the torque of the electric motor is the maximum torque value. 1. A work machine comprising:a swing structure;an electric motor for driving the swing structure;an electricity storage device connected to the electric motor;an inverter that controls driving of the electric motor;a swing control lever unit that issues a drive command to the electric motor as a drive command for the swing structure;a swing speed detecting device that detects rotational speed of the electric motor as swing speed of the swing structure; anda controller that controls torque of the electric motor, whereinthe controller reads the swing speed of the swing structure detected by the swing speed detecting device to thereby control such that, when the swing speed is zero, the torque of the electric motor is smaller than a maximum torque value and, when the swing speed is a first rotational speed higher than zero, the torque of the electric motor is the maximum torque value.2. The work machine according to claim 1 , further comprisinga operation amount detecting device that detects an operation amount of the swing control lever unit, whereinthe controller includes:a reference torque calculation unit that reads the ...

REDUCING ELECTROMAGNETIC NOISE DETECTED IN SURFACE MEASUREMENTS

A method for reducing noise at a wellsite includes transmitting a plurality of first signals from a variable frequency drive (VFD) to an alternating current (AC) induction motor. A timing of a plurality of second signals is varied to control transistors in an inverter of the VFD, thereby reducing harmonic distortion of the first signals output from the VFD. The timing is varied based at least partially upon an estimation of the harmonic distortion. 1. A method for reducing noise at a wellsite , comprising:transmitting a plurality of first signals from a variable frequency drive (VFD) to an alternating current (AC) induction motor; andvarying a timing of a plurality of second signals to control transistors in an inverter of the VFD, thereby reducing harmonic distortion of the first signals output from the VFD, wherein the timing is varied based at least partially upon an estimation of the harmonic distortion.2. The method of claim 1 , further comprising:detecting the first signals using a measurement system; andcoordinating with an acquisition system and the VFD to reduce the harmonic distortion in a predetermined bandwidth for the detected first signals.3. The method of claim 1 , where the estimation of the harmonic distortion is obtained by determining an effect of a pulse sequence of the second signals on the VFD and the AC induction motor.4. The method of claim 3 , further comprising reducing the harmonic distortion before applying the pulse sequence on the inverter of the VFD claim 3 , wherein the harmonic distortion is reduced via an iterative process.5. The method of claim 1 , wherein the estimation of the harmonic distortion is directly obtained from a measurement performed on the first signals output from the VFD claim 1 , allowing the harmonic distortion in subsequent first signals to be further reduced.6. The method of claim 1 , wherein the VFD comprises a plurality of inverters claim 1 , wherein a rectifier in the VFD generates direct current (DC) power ...

ELECTRONIC CIRCUIT DEVICE

An electronic circuit device comprises an output part, which includes at least three phase parts and a first temperature sensor and a second temperature sensor, which output detection signals corresponding to temperatures of the output part. Each phase part includes two high-side and low-side switching elements. The first temperature sensor is located at a position between the first phase part and the second phase part. The second temperature sensor is located at a position between the second phase part and the third phase part. The electronic circuit device further comprises a control circuit part, which specifies a phase part of overheat among the phase parts based on the detection signals of the first temperature sensor and the second temperature sensor. 1. An electronic circuit device comprising:an output part including at least three phase parts, each of which is formed of two switching elements connected in series to turn on and off;temperature sensors for outputting detection signals corresponding to temperatures of the output part, the temperature sensors being less by one in number than the phase parts and located between adjoining two of the phase parts; anda control circuit part for specifying a phase part of overheat among all of the phase parts based on all of the detection signals.2. The electronic circuit device according to claim 1 , wherein:when the control circuit part specifies the phase part of overheat, the control circuit part controls the switching elements in the phase part of overheat to stop turning on and off.3. The electronic circuit device according to claim 1 , wherein:the control circuit part specifies the phase part of overheat by comparing the detection signals with a first threshold value and a second threshold value, which is larger than the first threshold value; andwhen only one of the detection signals exceeds the first threshold value, the control circuit part specifies, as the phase of overheat, the phase part, which adjoins ...

Electrical Power Converting Device

An electrical power converting device includes: a converter circuit part that includes a switching circuit and a transformer and converts a voltage between a voltage on a high voltage power source side and a voltage on a low voltage power source side in an unidirectional or bidirectional manner; a filter circuit part that is connected to a low-voltage side of the converter circuit part and includes an inductor and a capacitor; a control circuit board on which a control part is mounted, the control part controlling the switching circuit; and a metal housing in which an interior space of the housing is divided into a first accommodation space and a second accommodation space by a partition wall including a cooling liquid flow path, wherein the converter circuit part is arranged in the first accommodation space, and the filter circuit and the control circuit board are arranged in the second accommodation space. 1. An electrical power converting device , comprising:a converter circuit part that includes a switching circuit and a transformer and converts a voltage between a voltage on a high voltage power source side and a voltage on a low voltage power source side in an unidirectional or bidirectional manner;a filter circuit part that is connected to a low-voltage side of the converter circuit part and includes an inductor and a capacitor;a control circuit board on which a control part is mounted, the control part controlling the switching circuit; anda metal housing in which an interior space of the housing is divided into a first accommodation space and a second accommodation space by a partition wall including a cooling liquid flow path, whereinthe converter circuit part is arranged in the first accommodation space, and the filter circuit and the control circuit board are arranged in the second accommodation space.2. The electrical power converting device according to claim 1 , wherein:the partition wall includes an outflow/inflow port through which an electrical ...

Power Conversion System

A surge according to a change of a switching state can be reduced without increasing a torque ripple of a motor. A first switching signal to control switching of a boost converter is generated on the basis of a comparison of a first duty command value and a first triangular wave carrier of the boost converter. A second switching signal to control switching of an inverter is generated on the basis of a comparison of a second duty command value and a second triangular wave carrier of the inverter. In addition, the second triangular wave carrier is generated such that a frequency of the second triangular wave carrier becomes equal to a frequency of the first triangular wave carrier and a phase of the second triangular wave carrier is different from a phase of the first triangular wave carrier by 180 degrees. 113.-. (canceled)14. A power conversion system , comprising:a boost converter which boosts a direct-current voltage;an inverter which converts an output voltage of the boost converter into an alternating-current voltage; anda control device which controls switching of the boost converter and the inverter;wherein the control device has a switching signal generation unit which generates a first switching signal to control the switching of the boost converter and a second switching signal to control a switching operation of the inverter,the switching signal generation unit generates the first switching signal and the second switching signal, such that the first switching signal is turned on and the second switching signal is turned off, during a first period to be a period of the half of a carrier cycle, andthe switching signal generation unit generates the first switching signal and the second switching signal, such that the first switching signal is turned off and the second switching signal is turned on, during a second period to be a period of the half of the carrier cycle and to be continuous to the first period.15. The power conversion system according to claim ...

METHOD AND DEVICE FOR SAFE VOLTAGE CONNECTION OF A DRIVE INVERTER

A device and a method connect and reliably separate a voltage terminal of a drive inverter for an electric machine to or from a supply voltage. The device contains a connection and interruption circuit with two switching branches connected between a supply voltage terminal of the supply voltage and the voltage terminal of the drive inverter. A control and/or regulating device is programmed and/or the circuitry of which is configured to connect the supply voltage to the voltage terminal of the drive inverter via the switching branches and to deactivate one of the switching branches in a first test mode and to read a sensor signal from the switching branch while the other switching branch is activated and conducts the supply voltage to the voltage terminal of the drive inverter. 1. An apparatus for connecting and safely isolating a voltage connection of a drive inverter for an electrical machine to and from a supply voltage , the apparatus comprising:a connecting and interrupting circuit having two switching branches connected between a connection for the supply voltage and the voltage connection of the drive inverter, said connecting and interrupting circuit further having a drivable isolating or grounding circuit and the voltage connection of the drive inverter being connected to a reference potential of the supply voltage via said drivable isolating or grounding circuit; anda control and/or regulating device set up, in terms of at least one of circuitry or programming, to connect the supply voltage to the voltage connection of the drive inverter via said switching branches and, in a first test mode, to switch off one of said switching branches and to read a sensor signal from said one switching branch, while the other said switching branch is switched on and passes the supply voltage to the voltage connection of the drive inverter.2. The apparatus according to claim 1 , wherein:said switching branches each have a semiconductor switch, connected between the ...

POWER CONVERSION DEVICE

A first offset voltage which is added to voltage commands in a first three-phase voltage command calculated on the basis of a control command for an AC rotary machine, and a second offset voltage which is added to voltage commands in a second three-phase voltage command calculated on the basis of a control command for the AC rotary machine, are set in such a manner that a period during which one of a first power converter and a second power converter outputs an effective vector and the other thereof outputs a zero vector occurs during a carrier period of a first carrier wave signal and a second carrier wave signal. 2. The power conversion device according to claim 1 , wherein the first offset voltage and the second offset voltage are set in such a manner that a period during which the first power converter and the second power converter both output the effective vectors does not occur in the carrier period.3. The power conversion device according to claim 1 , wherein one of the first offset voltage and the second offset voltage is set to a value of 50% of the DC voltage claim 1 , and the other thereof is set to a value greater than 50% of the DC voltage or a value less than 50% of the DC voltage.4. The power conversion device according to claim 1 , wherein the first offset voltage and second offset voltage are both set to a value greater than 50% of the DC voltage or a value less than 50% of the DC voltage.5. The power conversion device according to claim 4 , wherein the first offset voltage and the second offset voltage are set to the same value as each other.6. The power conversion device according to claim 1 , wherein the offset calculator alternately selects a first setting state in which the first offset voltage and the second offset voltage each are set to a value less than 50% of the DC voltage claim 1 , and a second setting state in which the first offset voltage and the second offset voltage each are set to a value greater than 50% of the DC voltage claim 1 ...

MOTOR CONTROL APPARATUS AND METHOD

An apparatus for controlling an AC power supply for an electric motor, said AC power supply being derived from a DC voltage. The apparatus including a comparer configured to provide a comparison of a modulation index of a motor control signal with a reference value. This current data provider is configured to provide current data based on a torque demand signal; a speed signal indicating the speed of rotation of the AC motor; and an indication of the DC voltage modified on the comparison for control of the motor control signal which is based on the motor current data. 2. The apparatus of claim 1 , comprising a torque demand modifier configured to modify the torque demand signal based on the modified indication of the DC voltage in the event that the modified indication of the DC voltage is outside a first selected range claim 1 ,and in which the current data provider is configured to provide motor current data based on the modified torque demand signal.3. The apparatus of comprising a current data modifier configured to modify the provided current data based on the difference between the modified torque demand signal and a boundary of a second selected range in the event that the torque demand signal is outside the second selected range.6. The apparatus of claim 5 , in which the processor is configured to modify the torque demand signal based on the modified indication of the DC voltage in the event that the modified indication of the DC voltage is outside a first selected range claim 5 , and to provide motor current data based on the modified torque demand signal.7. The apparatus of in which the processor is configured to modify the provided current data based on the difference between the modified torque demand signal and a boundary of a second selected range in the event that the torque demand signal is outside the second selected range.9. The apparatus of any preceding claim in which the current data comprises a direct phase current information claim 6 , and ...

ELECTRIC DRIVE DEVICE AND CONTROL METHOD FOR SAME

Provided is an electric drive device which controls a current supplied to coils during normal operation so as to be less than a current limit value when normal, which is determined from heat generating properties and heat radiating properties of a thermally coupled body that includes the coils and an inverter circuit. When an abnormality in each group or each phase of the coils and the inverter circuit is detected, the supply of current to all phases of a group suffering an abnormality in the coils, or to a phase that is not capable of continuous operation, is stopped or reduced; and the limit value of the current supplied to a coil that is capable of continuous operation is reset to a current limit value in the event of abnormality, which is larger than the current limit value when normal, within the range of improvement of the heat generating properties of the thermally coupled body due to the stopping or reduction of the supply of current. 1. An electric drive device , comprising:a multiple-phase rotary machine having a stator in which coils of m groups and n phases are wound, where m is a natural number equal to or greater than 1 and n is a natural number equal to or greater than 2, and a single rotor;an inverter circuit which supplies current independently to each group and each phase of the coils; anda control circuit including a drive circuit which drives the inverter circuit,the control circuit controlling a current supplied to the coils during normal operation so as to be less than a current limit value when normal, which is determined from heat generating properties and heat radiating properties of a thermally coupled body that includes the coils and the inverter circuit,wherein the control circuit further includes an abnormality detection circuit which detects an abnormality in each group or each phase of the coils and the inverter circuit, and when the abnormality detection circuit detects an abnormality, the control circuit:stops or reduces the supply ...

METHOD FOR CONTROLLING AN INVERTER

The invention relates to a method for controlling a three-phase inverter () using a 120° control arrangement associated with a PWM-type control, the inverter () being driven by a controller and configured to power a permanent-magnet synchronous motor () of a device on board an aircraft. The motor () comprises a stator and a rotor that can be rotated relative to the stator when the motor () is powered. The inverter () comprises three branches (), each branch comprising two switches ( and ) associated with a motor winding sing a 120° control arrangement of a three-phase inverter. The method is characterised in that when one switch on one branch is controlled such as to switch front the on-state to the off-state, the other switch on said branch is controlled such as to be in the on-state for a sufficient amount of time to allow the magnetic discharge of the motor winding associated with said branch. 112-. (canceled)13. A method for controlling a three-phase inverter using a 120° control arrangement associated with a PWM type control , the three-phase inverter being controlled by a controller and configured to power a motor of a device carried on board an aircraft , the motor being a permanent magnet synchronous motor and comprising a stator , a rotor and three motor windings according to a 120° control arrangement , the rotor being designed to be driven in rotation relative to the stator when the motor is powered , the three-phase inverter comprising three branches , each branch including a first switch and a second switch , each branch being associated with a motor winding , the method comprising:when the first switch of a first branch of the three branches is controlled from a passing state to a blocking state, controlling the second switch of the first branch in the passing state for a discharge time interval, the discharge time interval being sufficiently long for the motor winding associated with the first branch to magnetically discharge.14. The method according ...

VOLTAGE CONVERTER, ELECTRIC DRIVE SYSTEM AND METHOD FOR REDUCING INTERFERENCE VOLTAGES

The present invention relates to interference suppression of interference signals from an inverter. To this end, a current-compensated inductor is provided at the input end of an inverter, in particular a pulse-controlled inverter. This current-compensated inductor is preferably arranged between a DC voltage source and an intermediate circuit capacitor of the inverter. Polyphase inductors at the AC voltage output of the inverter can be dispensed with in this way. 11. A voltage converter () , comprising:{'b': 10', '110', '2', '120', '3, 'an inverter (), comprising a two-phase DC voltage input (), which is connectable to a DC voltage source (), and comprising a polyphase AC voltage output (), which is connectable to an electrical load (); and'}{'b': 11', '110', '10', '2, 'a current-compensated inductor () arranged between the DC voltage input () of the inverter () and the DC voltage source ().'}2112011111211111111111110102121111211010222abab. The voltage converter () as claimed in claim 1 , wherein the DC voltage input () comprises a first terminal () and a second terminal () and wherein the current-compensated inductor () comprises a first winding () and a second winding () claim 1 , wherein the first winding () is arranged between the first terminal () of the DC voltage input () of the inverter () and a first terminal () of the DC voltage source () claim 1 , and the second winding () is arranged between the second terminal () of the DC voltage input () of the inverter () and a second terminal () of the DC voltage source ().31120101211221231412112212310i. The voltage converter () as claimed in claim 1 , wherein the AC voltage output () of the inverter () comprises a plurality of phase terminals ( claim 1 , claim 1 , ) claim 1 , and wherein a capacitor (-) is arranged between each phase terminal ( claim 1 , claim 1 , ) of the inverter () and a reference potential.4112010121122123141512112212310ii. The voltage converter () as claimed in claim 1 , wherein the AC voltage ...

POWER CONVERTER

A power converter () for operating a first electric machine () and a second electric machine (), comprising: 1101214. A power converter () for operating a first electric machine () and a second electric machine () , comprising:{'b': 16', '18', '21', '22', '23', '10', '60, 'a first converter element (), a second converter element () and a first terminal connection (), a second terminal connection () and a third terminal connection () for connecting the power converter () to a three-phase energy supply (), wherein'}{'b': 16', '31', '32', '18', '33, 'the first converter element () comprises a first rectifier circuit () and a second rectifier circuit (), the second converter element () comprises a third rectifier circuit (), wherein'}{'b': 31', '51', '52', '32', '53', '54', '33', '55', '56, 'the first rectifier circuit () has a first AC-side pole () and a second AC-side pole (), the second rectifier circuit () has a third AC-side pole () and a fourth AC-side pole () and the third rectifier circuit () has a fifth AC-side pole () and a sixth AC-side pole (),'}{'b': 31', '32', '41', '42, 'the first rectifier circuit () and the second rectifier circuit () are connected in parallel on the DC-voltage side and are connected to a common first DC-voltage-side pole () and a common second DC-voltage-side pole (), wherein'}{'b': 33', '43', '44, 'the third rectifier circuit () is connected on the DC-voltage side to a third DC-voltage-side pole () and a fourth DC-voltage-side pole (), wherein'}{'b': 41', '43', '36, 'the first DC-voltage-side pole () is at least connectable to the third DC-voltage-side pole () by means of a first current path () and'}{'b': 42', '44', '37, 'the second DC-voltage-side pole () is at least connectable to the fourth DC-voltage-side pole () by means of a second current path (), wherein'}{'b': 36', '37', '64, 'at least the first current path () or the second current path () comprises a semiconductor switch ().'}210643133. The power converter () as claimed in ...

Induction Machine Having a Customized Field-Forming Current Component

An induction machine includes a stator and a rotor, wherein a stator winding is arranged within the stator, a control device controls a converter such that the converter connects the stator winding to a power-supply network such that a stator current flows within the stator winding, and the stator current has a field-forming current component and a torque-forming current component, where the control device controls the converter such that, during load periods, a torque acts between the stator and the rotor, controls the converter during periods of rest such that a torque acts between the stator and the rotor, controls the converter at least at the beginning of the periods of rest such that the field-forming current component has a nominal value, and controls the converter during the load periods such that the field-forming current component has a lower value than the nominal value.

TRUCK AND METHOD OF CONTROLLING ELECTRIC DRIVE MOTOR FOR DRIVING MOUNTED ON TRUCK

When the rotation speed is zero, the current value is specified to monotonically increase with an increase in depression amount of an accelerator pedal in a range of a depression amount from 0% to a predetermined amount P The current value is fixed to a limit value Ith irrespective of the depression amount in a range of the depression amount from the predetermined amount P to 100%. 1. A truck , comprising:an electric drive motor for driving;an inverter including a plurality of switching elements configured to apply alternating current flow into the electric drive motor;an accelerator pedal configured to control a current value flowing into the electric drive motor; anda control unit configured to control a current value flowing into the inverter according to a depression amount of the accelerator pedal and a rotation speed of the electric drive motor, whereinwhen the rotation speed of the electric drive motor is zero, the control unit controls the current value flowing into the inverter to be equal to or lower than a limit value obtained by multiplying a predetermined maximum value by a predetermined ratio that is any value in a range of not lower than 50% and lower than 100%.2. A truck , comprising:an electric drive motor for driving;an inverter including a plurality of switching elements configured to apply alternating current flow into the electric drive motor;an accelerator pedal configured to control a current value flowing into the electric drive motor; anda control unit configured to control a current value flowing into the inverter according to a depression amount of the accelerator pedal and a rotation speed of the electric drive motor, whereinwhen the depression amount is 100%, the control unit controls the current value to a predetermined maximum value when the rotation speed is equal to a first rotation speed that is lower than zero or the rotation speed is equal to a second rotation speed that is higher than zero, while controlling the current value to ...

TRANSFORMER BASED VARIABLE VOLTAGE CONVERTER

A vehicle electric drive includes a battery, an electric machine, and a variable voltage converter. The variable voltage converter includes switches, a transformer having a pair of windings sharing a common terminal with a series connected input capacitor, and an inductor electrically between the switches and transformer. The transformer and input capacitor are in parallel with the battery. The variable voltage converter is configured to boost voltage of the battery via operation of the switches. 1. A vehicle electric drive comprising:a battery;an electric machine; and including switches, a transformer having a pair of windings sharing a common terminal with a series connected input capacitor, and an inductor electrically between the switches and transformer, the transformer and input capacitor being in parallel with the battery, and', 'configured to boost voltage of the battery via operation of the switches., 'a variable voltage converter'}2. The vehicle electric drive of claim 1 , wherein operation of the switches as internal resistance of the battery changes by an order of magnitude results in changes in peak-to-peak values of battery ripple current of less than 20%.3. The vehicle electric drive of claim 1 , wherein one of the pair shares another terminal with the battery.4. The vehicle electric drive of claim 1 , wherein the one has a number of turns greater than the other of the pair.5. The vehicle electric drive of claim 1 , whereon one of the pair shares another terminal with the inductor.6. A vehicle electric drive comprising:a battery;a motor and generator; anda variable voltage converter electrically between the battery and the motor and generator, and including a series connected transformer and capacitor in parallel with the battery such that operation of the variable voltage converter as internal resistance of the battery changes by an order of magnitude results in changes in peak-to-peak values of battery ripple current of less than 20%.7. The vehicle ...

POWER CONVERSION DEVICE FOR ELECTRIC VEHICLE

A power conversion device for an electric vehicle includes an inverter that drives a motor mounted in an electric vehicle, and a controller that controls the inverter based on an operation command. The controller includes a sensorless control unit, and corrects an initial resistance value set in the controller, based on temperature information of a temperature sensor mounted in a cooler, sets a resistance value of the motor to the corrected initial resistance value, and causes the sensorless control unit to operate based on the set resistance value. 1. A power conversion device for an electric vehicle comprising:an inverter to drive a motor mounted in an electric vehicle; anda controller to control the inverter based on an operation command,wherein the controllerincludes a sensorless control unit, andcorrects an initial resistance value set in the controller, based on temperature information of a temperature sensor provided in the power conversion device or temperature information transmitted from outside of the power conversion device, sets a resistance value of the motor to the corrected initial resistance value, and causes the sensorless control unit to operate based on the set resistance value of the motor.2. The power conversion device for an electric vehicle according to claim 1 , whereinthe controller includes:a resistance estimation unit to calculate a resistance estimated value that is an estimated value of the resistance value of the motor using a current flowing to the motor; anda resistance-value setting unit to retain the corrected initial resistance value, output the initial resistance value to the sensorless control unit until receiving the resistance estimated value from the resistance estimation unit, and output the resistance estimated value to the sensorless control unit after receiving the resistance estimated value from the resistance estimation unit.35-. (canceled)6. The power conversion device for an electric vehicle according to claim 2 , ...

DRIVE CIRCUIT OF SWITCHING CIRCUIT

Provided is a switch drive circuit that drives a plurality of switches mutually connected in parallel including a charge unit allowing charge current to flow to the gate of the switch; an off switch connecting between the gate of the switch and the ground; a detection unit detecting whether charge state of the gate of the switch is in a predetermined state; and a changeover unit that changes a state of off switches when the charge units allow the charge current to flow to the gate. The changeover unit changes the state of the off switches to be ON when detection units do not detect the charge state of the gate being in the predetermined state, and to change the state of the off switches to be OFF when detection units detect the charge state of the gate being in the predetermined state. 2. The switch drive circuit according to claim 1 , whereinthe switch drive circuit includes a communication unit commonly provided for respective detection units, transmitting a detection result of the respective detection units;the communication unit is configured to change an output mode of a signal indicating the detection result, when the respective detection units detect that the charge state of the gate of each switch is in the predetermined state; andthe changeover unit is configured to change the state of respective off switches to be OFF when determining that the communication unit changes the output mode of the signal.3. The switch drive circuit according to claim 2 , whereinthe changeover unit is provided for each of the plurality of switches; andeach of the changeover units is configured to change the off switch corresponding to own changeover unit to be OFF.4. The switch drive circuit according to claim 1 , whereinthe switch drive circuit includes an off clamping control unit that changes the off switch to be ON when a drive signal of the switch is an OFF command.5. The switch drive circuit according to claim 1 , whereinthe charge unit is configured as a constant current ...

MULTI-LEVEL MEDIUM-VOLTAGE INVERTER

A multi-level medium-voltage inverter that receives three-phase power and outputs a three-phase voltage to a three-phase motor, includes: a plurality of unit power cells connected in series to output a single phase voltage, individual unit power cells each having a phase voltage forming a single level to configure multiple levels; and a module-type phase shift transformer configured to convert the three-phase power and applying the converted power to three unit power cells constituting one level, wherein the module-type phase shift transformer includes a plurality of modules. 1. A multi-level medium-voltage inverter that receives three-phase power and outputs a three-phase voltage to a three-phase motor , the multi-level medium-voltage inverter comprising:a plurality of unit power cells connected in series to output a single phase voltage, individual unit power cells each having a phase voltage forming a single level to configure multiple levels; anda module-type phase shift transformer configured to convert the three-phase power and applying the converted power to three unit power cells constituting one level,wherein the module-type phase shift transformer includes a plurality of modules.2. The multi-level medium-voltage inverter of claim 1 , wherein the number of modules of the phase shift transformer corresponds to the number of multiple levels or the number of unit power cells.3. The multi-level medium-voltage inverter of claim 1 , wherein claim 1 , in the module-type phase shift transformer claim 1 , a phase shift angle of a primary winding is determined using the number of the module-type phase shift transformers claim 1 , the number of outputs of a secondary side of the module-type phase shift transformer claim 1 , and the number of pulses of a rectifying unit of the unit power cell.4. The multi-level medium-voltage inverter of claim 1 , wherein the unit power cell comprises:the rectifying unit configured to receive an output from the module-type phase shift ...

DESIGN ASSISTANCE DEVICE AND DESIGN ASSISTANCE PROGRAM

Provided is a design support device configured to support design of a power supply system in which power from a power supply is distributed and supplied to a plurality of load devices by a power distribution supply path in which a plurality of power cables are combined, the design support device including: a unit configured to acquire configuration information indicating a configuration of the power distribution supply path; a unit configured to acquire, for each of the plurality of load devices, operation pattern information representing an operation pattern of the load device; a unit configured to calculate, for each power cable, a maximum current value, which is a maximum value of a current flowing through the power cable, based on the configuration information and the operation pattern information of each load device; and a unit configured to output, for each power cable, at least one of the maximum current value for the power cable and recommended cable information representing a cable recommended for use as the power cable based on the calculated maximum current value for each power cable. With this configuration, the design of the power supply system is supported. 1. A design support device configured to support design of a power supply system in which power from a power supply is distributed and supplied to a plurality of load devices by a power distribution supply path in which a plurality of power cables are combined , the design support device comprising:a first acquisition unit configured to acquire configuration information indicating a configuration of the power distribution supply path;a second acquisition unit configured to acquire, for each of the plurality of load devices, operation pattern information representing an operation pattern of the load device;a calculation unit configured to calculate, for each power cable in the power supply system, a maximum current value, which is a maximum value of a current flowing through the power cable, based on ...

DEVICE FOR MEASURING A RELATIVE ROTATION SPEED AND/OR A RELATIVE ANGULAR POSITION BETWEEN A FIRST ROTATING ELEMENT AND A SECOND ROTATING ELEMENT MOUNTED TO ROTATE RELATIVE TO A STATIC PART

A device for measuring a relative rotation speed and/or a relative angular position between a first rotating element () and a second rotating element (). The device includes a structure for generating a magnetic field rotating at a magnetic rotation speed representing a rotation speed of the first rotating element and a sensor () mounted to rotate and adapted to produce from the rotating magnetic field a measurement signal representing the relative rotation speed and/or the relative angular position. The device also has a processor () positioned on the static part and intended to acquire the measurement signal. A transmitter is adapted to transmit the measurement signal to the processor from the sensor. 121023103. A measuring device for measuring a relative rotation speed and/or a relative angular position between a first rotating element (; ) and a second rotating element (; ) mounted to rotate relative to a static part , the device including:means for generating a magnetic field rotating at a magnetic rotation speed representing a rotation speed of the first rotating element;{'b': 5', '105, 'a sensor (; ) mounted to rotate at the rotation speed of the first rotating element or at a rotation speed of the second rotating element and sensitive to the rotating magnetic field, the sensor being adapted to produce from the rotating magnetic field a measurement signal representing the relative rotation speed and/or the relative angular position;'}{'b': 11', '111, 'processing means (; ) positioned on the static part and intended to acquire the measurement signal;'}first transmission means adapted to transmit the measurement signal to the processing means from the sensor.2. The measuring device according to claim 1 , wherein the sensor is mounted on the second rotating element.313. The measuring device according to claim 1 , wherein the generation means include a permanent magnet () or a winding positioned directly on the first rotating element to influence the sensor.4717. ...

SELF-COMMUTATED INVERTER AND OPERATION OF SAME

In a method for operating a self-commutated inverter, a direct voltage is supplied from a direct voltage circuit to electronic switches, which are controlled in an open-loop manner by space vector modulation, for generating a three-phase output voltage. The three-phase output voltage is supplied to a three-phase output filter arranged downstream of the electronic switches and coupled to the direct voltage circuit, allowing common mode portions of filter input currents of the output filter to flow into the direct voltage circuit. Filter output currents of the three-phase output filter are controlled in a closed-loop manner, and a zero-system voltage of the filter input voltages of the output filter is controlled in a closed loop manner as a function of a target voltage space vector of the space vector modulation and as a function of the filter input currents to suppress oscillations in a zero system of the filter input currents. 115.-. (canceled)16. A method for operating a self-commutated inverter , comprising:supplying a direct voltage from a direct voltage circuit to electronic switches, which are controlled in an open-loop manner by space vector modulation, for generating a three-phase output voltage;supplying the three-phase output voltage to a three-phase output filter arranged downstream of the electronic switches and coupled to the direct voltage circuit, allowing common mode portions of filter input currents of the output filter to flow into the direct voltage circuit,controlling filter output currents of the three-phase output filter in a closed-loop manner, andcontrolling a zero-system voltage of the filter input voltages of the output filter in a closed loop manner as a function of a target voltage space vector of the space vector modulation and as a function of the filter input currents of the output filter so as to suppress oscillations in a zero system of the filter input currents.17. The method of claim 16 , further comprising controlling the zero- ...

POWER FEED CONTROL SYSTEM AND POWER FEED CONTROL METHOD

A power feed control system includes: a first drive unit configured to include a first electrically driven device, a first inverter, a first fuel battery system, and a first voltage converter; a second drive unit configured to include a second electrically driven device, a second inverter, a second fuel battery system, and a second voltage converter; a common battery; and a control unit configured to perform control of the first inverter or/and the first voltage converter such that each current value of the first inverter and the first fuel battery system achieves a target value of a first current value that is determined on the basis of the first current value flowing between the first drive unit and the battery and a second current value flowing between the second drive unit and the battery and perform control of the second inverter or/and the second voltage converter such that each current value of the second inverter and the second fuel battery system achieves a target value of the second current value that is determined on the basis of the first current value flowing between the first drive unit and the battery and the second current value flowing between the second drive unit and the battery. 1. A power feed control system comprising:a first drive unit configured to include a first electrically driven device, a first inverter that is connected to the first electrically driven device and performs conversion between DC power and AC power, a first fuel battery system that supplies DC power to the first inverter, and a first voltage converter that performs voltage control of controlling a voltage of a DC-side terminal of the first inverter;a second drive unit configured to include a second electrically driven device, a second inverter that is connected to the second electrically driven device and performs conversion between DC power and AC power, a second fuel battery system that supplies DC power to the second inverter, and a second voltage converter that ...

Frequency Converter

A frequency converter is used for generating at least one frequency converter output voltage for an electric motor, wherein the at least one frequency converter output voltage has a prescribable frequency converter output voltage amplitude and a prescribable frequency converter output voltage frequency. The frequency converter has: a clocked DC/DC converter which is designed to generate from an input direct voltage having an input voltage level a DC/DC converter output voltage having a DC/DC converter output voltage level, wherein the DC/DC converter is designed to generate the DC/DC converter output voltage level in dependence on the prescribable frequency converter output voltage amplitude, and a clocked inverter having a number of controllable switches, to which inverter the DC/DC converter output voltage is applied and which is designed to actuate the switches with an inverter switching frequency in such a manner that the at least one frequency converter output voltage with the prescribable frequency converter output voltage frequency is generated from the DC/DC converter output voltage. 1. A frequency converter for generating at least one frequency converter output voltage which is used for driving an electric motor , wherein the at least one frequency converter output voltage has a prescribable frequency converter output voltage amplitude and a prescribable frequency converter output voltage frequency , the frequency converter comprising:a clocked DC/DC converter which is designed to generate from an input direct voltage comprising an input voltage level a DC/DC converter output voltage having a prescribable DC/DC converter output voltage level, wherein the DC/DC converter is designed to generate the DC/DC converter output voltage level in dependence on the prescribable frequency converter output voltage amplitude, anda clocked inverter comprising a number of controllable switches, to which inverter the DC/DC converter output voltage is applied and which is ...

SEMICONDUCTOR DEVICE

A semiconductor device includes a metal member, a first semiconductor chip, a second semiconductor chip, a first solder and a second solder. A quantity of heat generated in the first semiconductor chip is greater than the second semiconductor chip. The second semiconductor chip is formed of a material having larger Young's modulus than the first semiconductor chip. The first semiconductor chip has a first metal layer connected to the metal member through a first solder at a surface facing the metal member. The second semiconductor chip has a second metal layer connected to the metal member through a second solder at a surface facing the metal member. A thickness of the second solder is greater than a maximum thickness of the first solder at least at a portion of the second solder corresponding to a part of an outer peripheral edge of the second metal layer. 1. A semiconductor device comprising:a metal member;a first semiconductor chip that is disposed on a surface of the metal member and has a first metal layer at a surface facing the metal member;a second semiconductor chip that is formed of a material having larger Young's modulus than the first semiconductor chip and is disposed at a position different from the first semiconductor chip on the surface of the metal member, the second semiconductor chip having a second metal layer at a surface facing the metal member;a first solder that is disposed between the metal member and the first metal layer of the first semiconductor chip and connects the metal member and the first metal layer; anda second solder that is disposed between the metal member and the second metal layer of the second semiconductor chip and connects the metal member and the second metal layer, whereina quantity of heat generated in the first semiconductor chip is greater than a quantity of heat generated in the second semiconductor chip, anda thickness of the second solder is greater than a maximum thickness of the first solder at least at a ...

VOLTAGE CONTROL APPARATUS, MOTOR UNIT, IMAGE FORMING APPARATUS AND VOLTAGE CONTROL METHOD

In accordance with one embodiment, a voltage control apparatus comprises a pulse width control section, a pulse width modulation wave generation section, a variable amplifier control section and a variable amplifier. The pulse width control section specifies the pulse width of the pulse width modulation wave. The pulse width modulation wave generation section generates a pulse width modulation wave having the pulse width specified by the pulse width control section. The variable amplifier control section generates a GAIN signal for scaling up/down the pulse width modulation wave generated by the pulse width modulation wave generation section. The variable amplifier scales up/down the pulse width modulation wave generated by the pulse width modulation wave generation section according to the GAIN signal generated by the variable amplifier control section and outputs the scaled up/down the pulse width modulation wave. 1. A voltage control apparatus for generating a pulse width modulation wave , comprising:a pulse width control section configured to specify the pulse width of the pulse width modulation wave;a pulse width modulation wave generation section configured to generate a pulse width modulation wave having the pulse width specified by the pulse width control section;a variable amplifier control section configured to generate a GAIN signal for scaling up/down the pulse width modulation wave generated by the pulse width modulation wave generation section; anda variable amplifier configured to scale up/down the pulse width modulation wave generated by the pulse width modulation wave generation section according to the GAIN signal generated by the variable amplifier control section and output the scaled up/down pulse width modulation wave.2. The voltage control apparatus according to claim 1 , whereinthe GAIN signal is a signal for amplifying the pulse width modulation wave.3. The voltage control apparatus according to claim 2 , whereinthe GAIN signal is a signal ...

ELECTRIC POWER CONVERSION DEVICE

In a converter circuit of an electric power conversion device, an adjustment portion divides a voltage of a battery input to a semiconductor module, by a first capacity element and a second capacity element that are connected in series to each other. Then, a middle point between the first capacity element and the second capacity element is connected to a cooler to fix a potential thereof. The electric power conversion device can ensure that a waveform of a surge voltage that is generated on a creepage surface between a lead frame terminal and the cooler has a negative voltage range (a range where an offset voltage is applied). 1. An electric power conversion device comprising: the first switching element and the second switching element being connected in series between a high potential-side terminal and the low potential-side terminal,', 'the first rectification element being connected in an antiparallel manner to the first switching element,', 'the second rectification element being connected in an antiparallel manner to the second switching element,', 'the output terminal being connected to a middle point between the first switching element and the second switching element, the output terminal being connected to a high potential side of a battery, and', 'the low potential-side terminal being connected to a low potential side of the battery; and, 'a semiconductor module that includes a first switching element, a second switching element, a first rectification element, a second rectification element, an output terminal, and a low potential-side terminal,'} the first capacity element and the second capacity element being connected in series between the output terminal and the low potential-side terminal, and', 'the cooler being connected to the semiconductor module via an insulating plate, the semiconductor module being sealed by a mold resin., 'an adjustment portion that includes a first capacity element, a second capacity element, and a cooler, the adjustment ...

DETECTION DEVICE AND DETECTION METHOD OF ROTOR POSITION OF THREE-PHASE MOTOR

A detection device and a detection method of a rotor position of three-phase motor are disclosed which measure induced voltages under different voltage vectors and calculate an induced voltage relationship among the different induced voltages. Then the detection device and the detection method find out the rotor position suitable for the induced voltage relationship according to a rotor position table. Therefore, the detection device and the detection method can accurately detect the rotor position in a standstill state to prevent the three-phase motor from operating abnormally and burning out. 1. A detection device of a rotor position of a three-phase motor , used for detecting the rotor position of the three-phase motor in a standstill state , wherein a stator winding of the three-phase motor is composed of three coils , each coil has a phase end , and the detection device of the rotor position comprises:a full-bridge circuit electrically connected to each phase end;a logic circuit electrically connected to the full-bridge circuit, configured for sequentially outputting six different voltage vectors to the full-bridge circuit to control the full-bridge circuit sequentially inducting two of the three coils, wherein the six voltage vectors have a sequential relationship and relate to a phase commutation of the full-bridge circuit to provide the operation of the three-phase motor;a selector electrically connected to each phase end and the logic circuit, and configured for sequentially acquiring a voltage of the phase end of the non-inductive coil according to the six voltage vectors to generate six induced voltages; anda processor electrically connected to the selector, configured for receiving the six induced voltages and having a rotor position table, wherein the rotor position table has six different electrical position sections, an electrical period is composed of the six electrical position sections, each electrical position section corresponds to the six ...

POWER CONVERTER

A power converter is provided with semiconductor devices, a capacitor, a positive bus bar, and a negative bus bar. The negative bus bar includes a negative side body and a plurality of negative side branches. The negative side branches include an interposed negative side branch interposed between two positive side branches connected to the upper arm semiconductor devices that belong to the same semiconductor device group as the lower arm semiconductor devices connected to the negative side branches, and include an end negative side branch that is not interposed between two positive side branches. The self-inductance of the end negative side branch is smaller than the self-inductance of the interposed negative side branch. 1. A power converter comprising:semiconductor devices including a plurality of upper arm semiconductor devices and a plurality of lower arm semiconductor devices connected in series;freewheeling diodes connected in inverse parallel with respective semiconductor devices;a capacitor that smooths a DC voltage;a positive bus bar having a positive side body electrically connected to the capacitor and a plurality of positive side branches extending from the positive side body and electrically connected to the upper arm semiconductor devices; anda negative bus bar having a negative side body electrically connected to the capacitor and a plurality of negative side branches extending from the negative side body and electrically connected to the lower arm semiconductor devices, whereinthe positive side branches and the negative side branches are arranged alternately,two or more of the upper arm semiconductor devices that are simultaneously turned on and off and two or more of the lower arm semiconductor devices that are connected in series with the upper arm semiconductor devices and simultaneously turned on and off constitute a semiconductor device group,the negative side branches include an interposed negative side branch interposed between two of the ...

DIRECT-CURRENT SENSOR, ALTERNATING-CURRENT SENSOR, AND INVERTER HAVING THE SAME

The present invention is devised to allow accurate determination on quality of a current sensor, and provide a current sensor reduced in size and cost and an inverter having the current sensor. 1. A direct-current sensor that detects direct currents supplied to a plurality of inverters for driving an alternating-current motor in which winding wires of a stator are independent from each other in individual phases and a voltage is individually applied to the independent winding wires , whereinthe plurality of inverters has a P connecting wire connecting P buses for the plurality of inverters and an N connecting wire connecting N buses for the plurality of inverters, andthe direct-current sensor has a core surrounding the P connecting wire and the N connecting wire.2. The direct-current sensor according to claim 1 , outputting information including 0-phase current of the P connecting wire and 0-phase current of the N connecting wire.3. An inverter with the direct-current sensor according to claim 1 , comprising:an alternating-current sensor that detects alternating currents flowing into the individual winding wires; anda diagnosis unit that diagnoses a failure of the direct-current sensor and/or the alternating-current sensor based on output information from the direct-current sensor and an output signal from the alternating-current sensor.4. An inverter with the direct-current sensor according to claim 2 , comprising:a switching circuit unit that converts the direct current into the alternating current; anda control unit that controls the switching circuit unit to suppress the 0-phase currents based on output information from the direct-current sensor.5. An alternating-current sensor that detects alternating currents flowing to respective phases of an alternating-current motor in which winding wires of a stator are independent from each other in individual phases and a voltage is individually applied to the independent winding wires claim 2 , whereinthe alternating- ...

DQ0 AND INVERSE DQ0 TRANSFORMATION FOR THREE-PHASE INVERTER, MOTOR AND DRIVE DESIGN

A test and measurement device includes an interface configured to acquire analog three-phase signals from a device under test, and a processor programmed to execute instructions that cause the processor to perform a direct-quadrature-zero, DQ0, transformation and produce DQ0 signals based on the analog three-phase signals, and measure performance of the device under test based on the DQ0 signals. A method includes acquiring three-phase signals from a device under test, performing a direct-quadrature-zero, DQ0, transformation on the three-phase signals to produce DQ0 signals, and using the DQ0 signals to measure performance of the device under test. 1. A test and measurement device , comprising:an interface configured to acquire analog three-phase signals from a device under test; and perform a direct-quadrature-zero, DQ0, transformation and produce DQ0 signals based on the analog three-phase signals; and', 'measure performance of the device under test based on the DQ0 signals., 'a processor programmed to execute instructions that cause the processor to2. The test and measurement device as claimed in claim 1 , wherein measuring performance of the device under test based on the DQ0 signals comprises measuring at least one of ripple claim 1 , peak-to-peak amplitude claim 1 , DC average of DQ0 components claim 1 , Fast Fourier Transform plot of DQ0 component claim 1 , magnitude of D and Q claim 1 , harmonics measurement claim 1 , jitter analysis claim 1 , and total power of DQ0.3. The test and measurement device as claimed in claim 1 , further comprising a display claim 1 , wherein the processor is programmed to execute instructions that cause the processor to display the DQ0 signals on the display.4. The test and measurement device as claimed in claim 1 , wherein the processor is programmed to execute instructions that cause the processor to perform an inverse DQ0 transformation and produce reconstructed three-phase signals based on the DQ0 signals.5. The test and ...

DRIVE DEVICE

A drive device that includes a rotating-field rotary electric machine; and an inverter that drives the rotary electric machine, wherein: the rotary electric machine includes a stator core, and a coil wound on the stator core; the coil includes a first coil and a second coil electrically insulated from each other; and the inverter includes a first inverter circuit that supplies AC power to the first coil, and a second inverter circuit that supplies AC power to the second coil. 1. A drive device comprising:a rotating-field rotary electric machine; and the rotary electric machine includes a stator core, and a coil wound on the stator core;', 'the coil includes a first coil and a second coil electrically insulated from each other; and', 'the inverter includes a first inverter circuit that supplies AC power to the first coil, and a second inverter circuit that supplies AC power to the second coil., 'an inverter that drives the rotary electric machine, wherein2. The drive device according to claim 1 , wherein the first coil and the second coil are arranged to be shifted from each other in a circumferential direction.3. The drive device according to claim 2 , whereinthe stator core includes a plurality of slots arranged in a distributed manner in the circumferential direction;each of the first coil and the second coil includes a plurality of phase coil portions through which alternating currents of different phases flow; andwhen a set of a phase coil portion of the plurality of phase coil portions of the first coil and a phase coil portion of the plurality of phase coil portions of the second coil are controlled such that currents of a same phase that flow through the set is defined as an in-phase coil set, the phase coil portion of the plurality of phase coil portions of the first coil portion and the phase coil portion of the plurality of phase coil portions of the second coil portion of the in-phase coil set are spaced apart from each other by a distance equal to or ...

POWER CONVERTER FOR VEHICLE

According to one embodiment, a power converter for a vehicle includes four semiconductor element modules and a cooling unit. The four semiconductor element modules each include a switching element and a freewheeling diode and form circuits for three phases as circuits that perform three-phase AC output for driving one permanent magnet synchronous motor, the switching element using silicon carbide (SiC) and performing switching operation, the freewheeling diode using silicon carbide (SiC) and passing a freewheeling current, each of the circuits being related to single-phase AC output and having arms each of which connects the freewheeling diode anti-parallel to the switching element, the arms being connected in series. The cooling unit cools the four semiconductor element modules.

STEERING CONTROL DEVICE

In a steering control device equipped with an electric motor having a plurality of winding sets and a plurality of assist current output sections each outputting a motor drive current caused to flow through each of the plurality of winding sets, it is possible to quickly make the driver aware of a state in which abnormality is generated and to suppress deterioration in operability in the state in which the abnormality has been generated. 1. A steering control device comprising:an electric motor having a plurality of winding sets and generating an assist torque for assisting steering wheel operation by a driver;a plurality of assist current output sections each outputting a motor drive current to be caused to flow through each of the winding sets in order to drive the electric motor; andan evaluation level determination section detecting an abnormal condition relating to the plurality of winding sets and the plurality of assist current output sections and determining an evaluation level of the abnormal condition on the basis of the abnormal condition,wherein a magnitude of the assist torque generated by the electric motor is varied based on the evaluation level.2. The steering control device according to claim 1 , whereineach of the assist current output sections includes:an assist current computation section computing a current command value;a motor control section generating a motor drive signal based on the current command value; anda motor drive section outputting a motor drive current to each of the winding sets on the basis of the motor drive signal; andthe assist current computation section calculates an assist torque generated by the electric motor on the basis of a steering torque value detected by a torque sensor and the evaluation level determined by the evaluation level determination section.3. The steering control device according to claim 2 , wherein:the evaluation level determination section determines danger level as the evaluation level;the assist ...

POWER SUPPLY SYSTEM

A power supply system including: a driving motor capable of outputting power for driving a driving wheel; a main battery that stores electricity to be supplied to the driving motor; an engine capable of outputting power for driving the driving wheel; a starter motor that starts the engine; an auxiliary battery that stores electricity to be supplied to the starter motor and auxiliaries; a switch of capable of making or breaking an electric coupling between the auxiliary battery and the starter motor, and the auxiliaries and the main battery; and a control apparatus that diagnoses an abnormality in the auxiliary battery. The main battery is coupled to the auxiliaries via a DC-DC converter capable of stepping down a voltage of electricity stored in the main battery. The auxiliary battery is coupled to the auxiliaries via the switch. The controller diagnoses an abnormality in the auxiliary battery with the switch open. 1. A power supply system comprising:a driving motor capable of outputting power for driving a driving wheel;a main battery configured to store electricity to be supplied to the driving motor;an engine capable of outputting power for driving the driving wheel;a starter motor configured to start the engine;an auxiliary battery configured to store electricity to be supplied to the starter motor and auxiliaries;a switch of capable of making or breaking an electric coupling between the auxiliary battery and the starter motor, and the auxiliaries and the main battery, anda control apparatus comprising a controller configured to execute an abnormality diagnosis that diagnoses whether there is an abnormality in the auxiliary battery,wherein the main battery is coupled to the auxiliaries via a DC-DC converter capable of stepping down a voltage of electricity stored in the main battery,the auxiliary battery is coupled to the auxiliaries via the switch, andin the abnormality diagnosis, the controller diagnoses whether there is an abnormality in the auxiliary battery ...

POWER ARCHITECTURE FOR A VEHICLE SUCH AS AN OFF-HIGHWAY VEHICLE

The present disclosure relates to a power distribution architecture for an off-road vehicle. The power distribution architecture includes a work circuit and a propel circuit and is configured for facilitating bi-directional power exchange between the work circuit and the propel circuit. 1. A power distribution architecture for an off-road vehicle , the power distribution architecture comprising:a work circuit including a plurality of motion control units configured to be fluidly connected to separate hydraulic actuators, the motion control units each including an electric motor/generator mechanically coupled to a pump/motor;an electrical bus for providing electrical power to each of the electric motors/generators; anda common pressure rail for providing hydraulic power to each of the motion control units.2. The power distribution architecture of claim 1 , further comprising a hydraulic accumulator in fluid communication with the common pressure rail.3. The power distribution architecture of any of claim 1 , further comprising a first battery corresponding to the work circuit that is electrically connected to the electrical bus.4. The power distribution architecture of any of claim 1 , wherein the electrical bus is a DC electrical bus.5. The power distribution architecture of any of claim 1 , further comprising a prime mover which drives an electric generator for providing electrical power to a motor drive of an electric traction motor of a propel circuit of the vehicle claim 1 , wherein the prime mover also is coupled by a mechanical power take-off to a pump for pressuring the common pressure rail claim 1 , wherein the motor drive is configured to direct a DC output along a DC power line to a power distribution unit claim 1 , wherein the power distribution unit electrically connects the DC power line to the electrical bus and provides DC-DC power conversion such that the DC electrical bus has a lower DC voltage than the DC power line claim 1 , and wherein the power ...

Direct Torque Control Motor Controller with Transient Current Limiter

An AC motor controller is provided that utilizes a direct torque controller and primary and secondary control loops. The primary control loop operates in a relatively conventional manner, determining a voltage vector that sets the inverter switching variables for the motor's power inverter, where the voltage vector is based on the motor's torque and flux as estimated from the measured voltage and current of the motor. Application of the voltage vector determined by the primary loop is delayed until initiation of the next primary control loop cycle. The secondary loop, utilizing a faster sampling rate than that of the primary loop, compares the measured phase current to a preset current limit. If the secondary loop determines that the measured phase current has exceeded the preset current limit, it sets a null voltage vector, thereby limiting transient over currents.

MOTOR CONTROL DEVICE

A motor control device includes a power-consumption calculation unit that calculates a power loss L according to a motor current I or according to the motor current I and a motor velocity v, and calculates a motor output W from a product of the motor velocity v and a torque τ or thrust force, to determine whether a regenerative resistance is in an energized state. When the regenerative resistance is in an energized state, if a total value W+L of the power loss L and the motor output W is equal to or greater than 0 (W+L≧0), the power-consumption calculation unit calculates a power consumption P per unit time as W+L, and if a total value W+L of the power loss L and the motor output W is less than 0 (W+L<0), the power-consumption calculation unit calculates the power consumption P=0 per unit time.

POWER CONVERTER

A power converter for a three-phase electric rotary machine including first and second winding sets includes: first and second inverters corresponding to the first and second winding sets, respectively; and a control unit including a command calculation unit that calculates first and second voltage command values related to voltages to be applied to the first and second winding sets, and an excess correction unit that corrects first and second voltage command corresponding values corresponding to the first and second voltage command values. When one of the first and second voltage command corresponding values exceeds a limitation value which is set in accordance with a voltage capable of being outputted, the excess correction unit performs an excess correction process for correcting the other of the first and second voltage command corresponding values in accordance with an excess amount over the limitation value. 1. A power converter for converting electric power of a three-phase electric rotary machine including a first winding set and a second winding set , the power converter comprising:a first inverter corresponding to the first winding set;a second inverter corresponding to the second winding set; anda control unit including a command calculation unit that calculates a first voltage command value related to a voltage to be applied to the first winding set and a second voltage command value related to a voltage to be applied to the second winding set, and an excess correction unit that corrects a first voltage command corresponding value corresponding to the first voltage command value and a second voltage command corresponding value corresponding to the second voltage command value, wherein:when one of the first voltage command corresponding value and the second voltage command corresponding value exceeds a limitation value, which is set in accordance with a voltage capable of being outputted, the excess correction unit performs an excess correction process ...

Reactor

A reactor is provided. The reactor includes a coil and a terminal block that is fixed to conductor wires that led out from both ends in a winding core direction of the coil. The terminal block includes an input-side terminal block that is fixed to an input-side conductor wire that leads out from one end of the coil, and an output-side terminal block that is fixed to an output-side conductor wire that leads out from another end portion of the coil. The input-side terminal block and the output-side terminal block are disposed on different levels in the winding core direction based on lead-out positions in the winding core direction of the input-side conductor wire and the output-side conductor wire.

METHOD FOR CONTROLLING A BOOST CONVERTER HAVING N SWITCHING CELLS

A method controls a boost converter having N switching cells using synchronous pulse width modulation, in which N is a natural integer that does not equal zero. The method includes: measuring input voltages and output voltages of the boost converter; determining an output vector to define a representation of a linear state of the boost converter; calculating the variation in power of the electrical load; determining the N duty factors as a function of the second derivative of the output vector, the derivative of the power of the electrical load, and the ratio between the input voltage and the output voltage that have been measured; and controlling each switching cell of the converter depending on the duty factor that has been determined. 110-. (canceled)11. A method for controlling a boost converter with N switching cells in synchronous pulse-width modulation mode , in which N is a non-zero natural integer , the converter receiving at an input a DC electrical voltage (V) from a voltage source and supplying at the output an output voltage (V) greater than or equal to the input voltage (V) , the method comprising:{'sub': in', 'out, 'measuring the input (V) and output (V) voltages of said boost converter;'}determining an output vector (y) configured to globally linearize a system of equations of the boost converter;{'sub': 'out', 'calculating a power variation in an electrical load at the output of the converter ({dot over (P)});'}{'sub': k', 'out', 'in', 'out, 'determining the N duty cycles (α) of the converter as a function of the second derivative (ÿ) of the output vector (y), of the derivative of the power in the electrical load ({dot over (P)}), and of a ratio between the measured input voltage (V) and output voltage (V); and'}{'sub': 'k', 'controlling each switching cell (k) of the converter, as a function of the duty cycle determined (α).'}12. The method as claimed in claim 11 , wherein claim 11 , when the converter comprises N>1 switching cells (k) claim 11 , ...

ROTATING ELECTRIC MACHINE SYSTEM

A rotating electric machine system includes a rotating electric machine and an electric power conversion circuit. The rotating electric machine includes N coils connected with each other to define a neutral point therebetween. The electric power conversion circuit includes N high-side switches, N low-side switches, a selector switch, a full-wave driver, a half-wave driver and a drive controller. The full-wave driver performs a full-wave drive process with high potential-side terminals of the low-side switches respectively connected with low potential-side terminals of the high-side switches by the selector switch. The half-wave driver performs a half-wave drive process with the high potential-side terminals of the low-side switches connected with the neutral point by the selector switch. The drive controller controls both the full-wave driver and the half-wave driver to selectively cause either the full-wave driver to perform the full-wave drive process or the half-wave driver to perform the half-wave drive process. 1. A rotating electric machine system comprising a rotating electric machine and an electric power conversion circuit between which electric power is transferred ,the rotating electric machine including a stator core, and N coils wound on the stator core and respectively belonging to N phases, where N is an integer greater than or equal to 2, the coils being electrically connected with each other to define a neutral point therebetween,the electric power conversion circuit comprising N high-side switches, N low-side switches, a selector switch, a full-wave driver, a half-wave driver and a drive controller,the N high-side switches respectively corresponding to the N coils and each having a high potential-side terminal and a low potential-side terminal, all the high potential-side terminals of the high-side switches being electrically connected to a positive terminal of a DC power source,the N low-side switches respectively corresponding to the N coils and ...

Semiconductor Module

A semiconductor module includes a die pad area between positions where a plurality of power terminals are arranged and positions where an HVIC and an LVIC are arranged. A plurality of RC-IGBTs are arranged in the die pad area at positions closer to the plurality of power terminals than to the HVIC and the LVIC. 1. A semiconductor module , comprising:at least one RC-IGBT;at least one control IC;a power terminal;a gate wire which connects a gate of an IGBT in the RC-IGBT and the control IC; andan emitter wire which connects an emitter of the IGBT in the RC-IGBT and the power terminal,the semiconductor module including a die pad area between a position where the power terminal is arranged and a position where the control IC is arranged, the RC-IGBT being arranged in the die pad area at a position closer to the power terminal than to the control IC.2. The semiconductor module according to claim 1 , whereinthe die pad area is a rectangle, andwhen a side of the die pad area closest to the control IC is defined as a first side and a side opposite to the first side is defined as a second side, the RC-IGBT is arranged at a position closer to the second side than to the first side in a direction perpendicular to the first side and the second side.3. The semiconductor module according to claim 2 , whereinthe semiconductor module comprises a plurality of the RC-IGBTs constituting a three-phase inverter, andthe plurality of the RC-IGBTs are arranged in one line along the second side.4. A semiconductor module claim 2 , comprising:a plurality of RC-IGBTs constituting a three-phase inverter;at least one control IC;a power terminal;a gate wire which connects a gate of an IGBT in each of the RC-IGBTs and the control IC; andan emitter wire which connects an emitter of the IGBT in each of the RC-IGBTs and the power terminal,the semiconductor module including a rectangular die pad area between a position where the power terminal is arranged and a position where the control IC is ...