УСТРОЙСТВО ДЛЯ РЕГУЛИРОВАНИЯ ВЕЛИЧИНЫ МАГНИТНОГО ПОЛЯ (ВАРИАНТЫ)

... 1. Устройство для регулирования величины магнитного поля в главном фокусе объектива (29), содержащее источник напряжения (35), имеющий выходное напряжение, отличающееся тем, что содержит первый резистор (37), электрически подключенный к источнику напряжения (35) и имеющий первое сопротивление; заземление (40); второй резистор (41), электрически подключенный к заземлению (40) и имеющий второе сопротивление; усилитель мощности (38), имеющий вход, подключенный к первому резистору (37) и второму резистору (41), и выход, причем опорное напряжение усилителя мощности (38) ниже первого выходного напряжения и положительное относительно заземления (40); первый переключатель (36), имеющий первое открытое положение и первое закрытое положение, для избирательного подключения источника напряжения (35) к усилителю мощности (38); второй переключатель (42), имеющий второе открытое положение и второе закрытое положение, для избирательного подключения заземления (40) к усилителю мощности (38), причем второй ...

Устройство для исключения "ложного нуля"

Устройство для создания стабильного магнитного поля заданной напряженности

... 1. УСТРОЙСТВО ДЛЯ СОЗДАНИЯ СТАБИЛЬНОГО МАГНИТНОГО ПОЛЯ ЗАДАННОЙ НАПРЯЖЕННОСТИ, содержащее электромагнит, подключенный намагничивающими катушками к выходу управляемого источника питания, включающего регулирующий элемент, дифференциальный усилитель, узел сравнения и выпрямитель , один вывод которого является первым выходом управляемого источника питания , а другой соединен с первым выводом регулирующего элемента, подключенного управляющим входом к выходу дифференциального усилителя, вход которого подключен к выходу узла сравнения, магниторезонансный преобразователь, включающий генератор низкой частоты, датчик магнитного резонанса, фазовый детектор, амплитудный детектор и регулируемый генератор высокой частоты, причем генератор низкой частоты подключен к размещенному между полюсами электромагнита датчику магнитного резонанса и одному из входов фазового детектор,, другой вход которого соединен с выходом амплитудного детектора, входом соединенного с выходом регулируемого генератора высокой частоты ...

Линейный сельсин

Устройство для приготовления смесей

Устройство для формирования стабилизированных импульсов магнитного потока

Устройство для стабилизации магнитного поля электромагнита

Источник стабилизированного магнитного поля

Устройство для стабилизации магнитного поля электромагнита

Источник стабилизированногоМАгНиТНОгО пОля

Anordnung zur Messung und Regelung des Grundfeldes eines Magneten eines Kernspintomographiegerätes

Steuerkreis fuer die wahlweise Ladung und Entladung einer Kondensatorreihe

TAUCHANKER-ELEKTROMAGNET

ELECTROMAGNETIC ACTUATOR HAVING REGULATION OF THE FORCE ON THE ARMATURE

... 1324445 Hydraulic motor control circuits VOITH GETRIEBE KG 20 April 1971 [22 April 1970] 10296/71 Heading F1P [Also in Divisions G3 and H1] An electromagnetic actuator 1 comprises a coil 2 surrounded by iron cladding 3, 31 and an armature 4 axially movable therein in opposition to a projecting polepiece 5 against a spring 7; a fieldstrength sensitive resistor 8 being fixed to the face of 5 and connected in a resistor bridge circuit 8, 14, 15, 16 energized from source 11 and having an adjustable slider 165 between 15, 16. The voltages at bridge points 148, 165 are compared over in series resistors 23, 24 at inputs + E, - E of amplifier V and are initially equal, so that a fall of resistance of 8 produces a rise of voltage at 148 and at the amplifier output to open transistor T 1 and to drive power transistor T 2 to excite coil 2 from the source and impel the armature against spring 7. Buildup of field increases resistance of 8 and reduces voltage at 148, so that the amplifier output ...

Digital flux gate magnetometer

Detecting the operation of an electromagnetic actuator

The actuator for a valve has an armature 2 which is displaced into a valve closure position when a coil 4 is energised. In order to reduce the electrical power loss and to increase the operational reliability of the actuator a magnetic flux sensor 3 for detecting a variable proportional to the magnetic flux is connected to the core 1. The magnetic flux sensor 3 is connected to an electronic control device 5 in such a manner that the electrical power supplied to the coil 4 can be controlled by the detected variable proportional to the magnetic flux. The sensor may be a Hall effect device or a magnetic field variable resistor connected in a bridge circuit. ...

Method and device for maintaining stationary position of a ferromagnetic body freely floating in electromagnetic field

... 941,568. Automatic position control. TESLA, NARODNI PODNIK. Nov. 28, 1961 [Nov. 28, 1960], No. 42465/61. Heading G3R. In a system for stabilizing the position of a magnetic body suspended in the field of an electromagnet, movement of the body relative to a tuned circuit varies the average amplitude of oscillations set up in the tuned circuit by a source of pulses having a frequency less than the resonant frequency, such variation being utilized to control the position of the body by controlling the energization of the electromagnet. In Fig. 5, a magnetic body 2, e.g. the rotor of an ultra high speed centrifuge, is suspended in an evacuated space by the resultant field produced by opposed electromagnetic coils 23, 24 the relative energization of which is controlled by a double triode valve 9. Deviations of the body from a desired position influence the damping of a tuned circuit 3,4 which is supplied from a pulse source 14 having a frequency less than the resonant frequency of the tuned ...

FORMING REFERENCE VOLTAGE AMPLITUDE FOR INVERTER

PROCEDURE AND DEVICES FOR THE COLLECTION AND COMPENSATING A STANDING DC COMPONENT OF THE MAGNETIZING CURRENT OF HIGH FREQUENCY POWER TRANSFORMERS IN STATIC INVERTER CIRCUITS

DEVICE TO DETERMINING A FROM THE INTEGRAL OF THE LOAD TENSION AND IF NECESSARY THE LOAD CURRENT FORMING SIZE OF COMPANY OF A LOAD, IN PARTICULAR THE RIVER OF AN INDUCTION MACHINE.

METHOD AND APPARATUS FOR REGULATING TRANSMEMBRANE ION MOVEMENT

An improved apparatus and method for regulating transmembrane ion moveme nt through a biochemical membrane. The apparatus includes a magnetic field generator and a magnetic field detector for producing a controlled, fluctuating, directional ly oriented magnetic field parallel to a predetermined axis projecting through the membrane. The field detector samples the magnetic flux density along the predetermined access an d provides a signal to a microprocessor which determines the average value of the flux density. This ratio is maintained by adjusting the frequency of the fluctuating magnetic field and/or by adjusting the intensity of the applied magnetic field as the composite magnetic flux density changes in response to changes in the local magnetic field to which the targ et membrane is subjected. By maintaining these precise predetermined ratios of frequency to average magnetic flux density, ion transport is controlled.

MAGNETIC NOISE REDUCING DEVICE USING SQUID

A magnetic noise reducing device can effectively produce a practically noiseless space that can reduce environmental magnetic noise harmful for measuring biomagnetism with a high magnetism damping factor in low frequency range. The magnetic noise reducing device com prises a SQUID flux meter 1 and a pair of noise canceling coils 2 as minimum components, the feedback current I produced by the SQUID flux meter 1 being supplied to the noise canceling coils 2, the magnetic flux detecting coil of the SQUID flux meter being arranged within a specific central space 4 defined by the noise canceling coils 2 for effective reduction of magnetic noise within that space.

Dispositif permettant la mesure et/ou la stabilisation d'un champ magnétique par utilisation de l'effet Hall

Anordnung zur Regelung von Magnetfeldern unter Anwendung eines Kernresonanz-Magnetfeldmessers

Magnetfeldstabilisator

Anordnung zur zeitlich linearen Modulation eines gleichsinnig gerichteten Magnetfeldes

Einrichtung zur Stromversorgung mit zwei oder mehreren parallel geschalteten Generatoren, insbesondere für Wasserstoff-Blasenkammern

Einrichtung zur Stabilisierung eines Magnetfeldes

Einrichtung zur Ermittlung der Stärke eines Magnetfeldes mit einer Hall-Sonde

Schaltungsanordnung zur Steuerung der Auf- und Entladung eines Kondensatorblockes

Schaltungsanordnung eines Flusstabilisators für die Konstanthaltung eines magnetischen Feldes

Einrichtung zum gesteuerten Speisen eines Verbrauchers mit Gleichstrom

Vorrichtung zur Erzeugung eines Magnetfeldes mittels einer oder mehreren Spulen und zur Konstanthaltung des erzeugten Magnetfeldes

Verfahren und Vorrichtung zur Aufrechterhaltung einer unveränderlichen Lage eines ferromagnetischen, in einem magnetischen Feld frei schwebenden Körpers

Verfahren zur Regelung eines magnetisch fokussierten und ablenkbaren Ladungsträgerstrahles

Tauchanker-Elektromagnet mit einer Regelschaltanordnung

УСТРОЙСТВО ДЛЯ СОЗДАНИЯ СТАБИЛЬНОГО МАГНИТНОГО ПОЛЯ

Предметом изобретения является устройство для создания стабильного магнитного поля. С целью повышения производительности труда поверочных работ за счет одновременного создания нескольких стабильных значений индукции магнитного поля в полях рассеяния электромагнита размещены дополнительные концентраторы магнитного потока, которые отделены от основной полюсной системы и друг от друга немагнитными прокладками.

ИСТОЧНИК СТАБИЛЬНОГО МАГНИТНОГО ПОЛЯ

Источник стабильного магнитного поля содержит электромагнит с катушками, размещенными на первой полюсной системе и подключенными к выходу источника питания, чувствительный элемент, расположенный в зазоре второй полюсной системы, узел регулирования, вход которого соединен с выходом чувствительного элемента, а выход - с управляющим входом источника питания. С целью повышения качества стабилизации, в него введены промежуточный измерительно-усилительный узел с дополнительным чувствительным элементом, расположенным в зазоре первой полюсной системы, и дополнительные катушки, размещенные на второй полюсной системе и подключенные к выходу промежуточного измерительно-усилительного узла.

Способ определения концентрации носителей заряда в размерно-ограниченных анизотропных материалах

Изобретение относится к способам определения концентрации носителей заряда в размерно-ограниченных анизотропных материалах. Способ определения концентрации носителей заряда в размерно-ограниченных анизотропных материалах включает воздействие слабым магнитным полем с увеличением индукции на материал, измерение электрического сопротивления материала в зависимости от магнитной индукции, после двух его механических напряжений растягиванием, а концентрация носителей заряда определяется произведением начальной концентрации анизотропного материала на соотношение между большим и меньшим максимумами измеренных электрических сопротивлений после двух механических напряжений растягиванием. П. формулы: 1 Фиг.: 3 ...

Способ определения концентрации носителей заряда в размерно-ограниченных анизотропных материалах

Изобретение относится к способам определения концентрации носителей заряда в размерно-ограниченных анизотропных материалах. Способ определения концентрации носителей заряда в размерно-ограниченных анизотропных материалах включает воздействие слабым магнитным полем с увеличением индукции на материал, измерение электрического сопротивления материала в зависимости от магнитной индукции, после двух его механических напряжений растягиванием, а концентрация носителей заряда определяется произведением начальной концентрации анизотропного материала на соотношение между большим и меньшим максимумами измеренных электрических сопротивлений после двух механических напряжений растягиванием. П. формулы: 1 Фиг.: 3 ...

Pulsed magnetic field device for isolated cells

Heat treatment magnetic field device based on permanent magnetic structure

Stabilizing device of magnetic field

Actionable valve electromagnetically

... - La présente invention concerne une soupape actionnable électromagnétiquement, comportant un noyau magnétique en plusieurs parties, déplaçable par segment, par l'intermédiaire duquel un obturateur de soupape peut être actionné au moyen d'une bobine. - Selon l'invention, la partie mobile (2) du noyau magnétique présente une liaison par adhérence au poussoir ou à l'obturateur de la soupape, le noyau magnétique (1, 2) est relié à un capteur de flux magnétique (3) pour détecter une grandeur proportionnelle au flux magnétique, et le capteur de flux magnétique (3) est relié à un dispositif de réglage électronique (5), de sorte que la puissance électrique amenée à la bobine (4) et, ainsi, l'actionnement du poussoir de soupape sont réglables par l'intermédiaire de la grandeur proportionnelle au flux magnétique détectée.

Control circuit for an electromagnetic solenoid

Dispositif destiné à commander une bobine appartenant à un électroaimant, par exemple dans un appareil du genre contacteur. Une alimentation à découpage 14 présente un enroulement S1 alimentant un circuit de commande 15 et un autre enroulement S2 disposé avec un interrupteur T2 aux bornes de la bobine. L'interrupteur T2 est piloté par le circuit de commande pour alimenter la bobine dans la phase de maintien à partir de l'alimentation à découpage. Il en résulte une diminution des perturbations en phase de maintien.

FIRE DETECTOR AND A BASE FOR SUCH A DETECTOR

Le détecteur d'incendie (10), comporte, dans un boîtier (11): - un capteur (12) d'une grandeur physique représentative de la survenance d'un incendie, qui fournit un signal représentatif de la valeur captée, - un moyen (13) de détection déclenchant un signal d'alarme en fonction de la valeur du signal, - un générateur (14) de champ magnétique positionné en regard d'une paroi du boîtier, et - une source d'alimentation électrique autonome (15) qui alimente le capteur, le moyen de détection et le générateur de champ magnétique. Le socle (20) comporte, dans un boîtier (21) : - un support (25) pour retenir en position le boîtier du détecteur d'incendie, - un interrupteur Reed (22) positionné en regard d'une paroi du support, pour détecter le champ magnétique prédéterminé et - un moyen (23) de communication sans fil, pour transmettre, à distance, un signal d'alarme, lorsque le champ magnétique prédéterminé est détecté par l'interrupteur Reed.

VARIABLE VOLTAGE CIRCUIT

In a variable voltage circuit , a resistive element and a magnetoresistance effect element are connected in series between a first voltage source and a second voltage source . A magnetic field supply mechanism that applies a magnetic field to the magnetoresistance effect element is provided in the vicinity of the magnetoresistance effect element . The magnetic field supply mechanism can vary the resistance value of the magnetoresistance effect element by varying the magnetic field. A node between the resistive element and the magnetoresistance effect element is connected to an output terminal 1. A variable voltage circuit , wherein a plurality of resistive elements are connected in series between a first voltage source and a second voltage source , at least one of the plurality of resistive elements is a magnetoresistance effect element that has a magnetization fixed layer and a magnetization free layer with a spacer layer interposed therebetween , a magnetic field supply mechanism that applies a magnetic field to the magnetoresistance effect element is provided in a vicinity of the magnetoresistance effect element , the magnetic field supply mechanism is operable to vary a resistance value of the magnetoresistance effect element by varying the magnetic field , and one of nodes among the plurality of resistive elements is connected to an output terminal.2. The variable voltage circuit according to claim 1 , wherein the variable voltage circuit is structured so that a plurality of resistance values are obtained as at least one of a first resistance value between the first voltage source and the output terminal and a second resistance value between the second voltage source and the output terminal claim 1 , and a plurality of types of output voltages are thereby obtained according to voltage division ratios obtained from the first resistance value and the second resistance value.3. The variable voltage circuit according to claim 1 , wherein a plurality of the ...

Magnetic actuator with long travel in one direction

An actuator made up of a plurality of actuator elements is provided which actuator provides long travel in one dimension and short travel in five additional dimensions, with each actuator element providing long travel in the one dimension and short travel in at least two additional dimensions. For preferred embodiments, each actuator element includes a suspension core, the long travel being in one linear dimension and each actuator element providing short travel in two additional linear dimensions and at least one rotary dimension. More particularly, each actuator element includes an electrodynamic drive for providing controlled movement in the first dimension, which drive includes a voice coil mounted in a voice coil gap and at least one elongated high permeability core which is movable in the first dimension with respect to the voice coil; an electromagnetic drive for providing controlled movement in the at least one additional dimension (and in the two additional linear dimensions and ...

Systems and methods for magnetic shielding

Systems and methods for magnetic shielding are described. A magnetic shield formed of a material having a high magnetic permeability may be degaussed using a toroidal degaussing coil. The toroidal degaussing coil may enclose at least a portion of the shield. Magnetic field gradients may be actively compensated using multiple magnetic field sensors and local compensation coils. Trapped fluxons may be removed by an application of Lorentz force wherein an electrical current is passed through a superconducting plane.

ИСТОЧНИК ЛОКАЛИЗОВАННОГО МАГНИТНОГО ПОЛЯ

Полезная модель относится к области электромеханики и может быть использована в электромеханических и электротехнических устройствах, например в измерительных системах при геофизической съемке. Технический результат предлагаемой полезной модели заключаются в обеспечении локализации магнитного поля на расстоянии от плоского источника. Формула полезной модели: Источник локализованного магнитного поля, включающий концентрически расположенные катушки с противофазными токами различного диаметра, отличающийся тем, что он оборудован блоком задания и генерирования независимых токов и содержит N>2 концентрических катушек, расположенных на плоском диэлектрическом материале, подключенных к блоку задания и генерирования независимых токов электрически отдельно, с чередующимися направлениями токов в различных катушках, причем токи заданы блоком задания, исходя из решения задачи минимизации функционала, описывающего среднеквадратичное отличие пространственного спектра формируемого поля от константы, а ...

МАГНИТНЫЙ АНАЛОГОВЫЙ МНОГОЭЛЕМЕНТНЫЙ РЕГУЛЯТОР

Устройство для стабилизации нуль-пункта и чувствительности феррозондового магнитометра

Устройство для создания стабильного электромагнитного поля

Устройство для автоматического регулирования

Устройство для создания стабильного магнитного поля

Изобретение относится к измерительной технике, в частности к устройствам стабилизации напряженности магнитного поля. Целью изобретения является понижение порога чувствительности устройства. Цель достигается тем, что в устройство введен дополнительный электромагнит 5. Благодаря выбору оптимального рабочего объема электромагнита 5 величина напряженности стабилизируемого в нем магнитного поля в несколько раз превышает величину напряженности магнитного поля электромагнита 3. Отношение напряженностей этих полей и будет величиной, на которую понижается порог чувствительности устройства. При этом вынесение вариометра 9 за пределы электромагнита 3 позволяет исключить влияние вариометра на однородность магнитного поля. 1 ил.

Способ записи информации на ферритовый сердечник с прямоугольной петлей гистерезиса

Способ изменения магнитного потока

Регулятор для систем магнитного подвешивания грузов

Система питания электромагнита дляМАгНиТОфОНА (EE ВАРиАНТы)

SCHALTUNGSANORDNUNG ZUR ERZEUGUNG VON STARKSTROMIMPULS

Verfahren und Gerät zur Steuerung von Vorspannungspegeln in einer magneto-optischen Aufzeichnungsvorrichtung

Anordnung zur Regelung von Magnetfeldern unter Anwendung eines Kernresonanz-Magnetfeldmessers

ELECTROMAGNETIC POWER DRIVE FOR PRODUCING A PULSATING AXIAL FORCE IN A FRICTION WELDING MACHINE

GENERATING ALTERNATING MAGNETIC FLUX

Improvements in or relating to control arrangements for photo-electric devices in facsimile apparatus and the like

... 723,786. Photo-electric control systems; copying-telegraphy. MUIRHEAD & CO., Ltd. Oct. 7, 1952 [Oct. 26, 1951], No. 25070/51. Class 40 (3). A control arrangement for the output of a photo-electric cell in a facsimile scanner or like apparatus comprises means for automatically increasing the light and/or power inputs to the cell to increase its output from a low basic level to a predetermined value in response to an initiating switch operation, and for automatically restoring the output of the cell to a basic low level in response to a further switch operation. At the beginning of transmission a start switch 7 is closed and a motor drive unit 8, brought under control of a motor supply unit 6, operates a control member 2 for the lamp-supply unit 4 and a control member 3 for the photo-cell voltage unit 5. The output from the cell 10 in respect of a reference copy 11 is fed over a connection 10a, and also to a comparator 9 in which it is compared with the voltage from a standard source 1. When ...

Method and apparatus for forming a reference voltage amplitude for a three-phase inverter supplying a squirrel cage motor

A method of forming the amplitude of the reference voltage of a three-phase inverter supplying a squirrel cage motor requires no current measuring elements. In this method, the amplitude is formed by finding in predetermined constant flux curves which represent the squirrel cage motor in question, and in which the motor rotor current frequency appears as parameter, a curve from which is obtained the amplitude of the motor stator voltage, i.e. of the inverter reference voltage, corresponding to the frequency of the motor's stator voltage, i.e. of the inverter reference voltage, so that the magnetic flux in the stator will be constant.

Digital flux gate magnetometer

A flux-gate magnetometer 20 comprises an analog low pass filter 21 and a digital to analog converter 26 in a feedback arrangement to a feedback coil 16. The analog low pass filter 21 is arranged to filter a signal before it is applied to a digital logic circuit 22. The digital logic circuit 22 may include an analog to digital converter 23, an adder 25 and an accumulator 24. In the magnetometer 20 a low resolution analog to digital converter 23 and a high resolution digital to analog converter 26 may be employed. The resolution of the digital to analog converter 26 may be improved by inserting a dither circuit 27 at the input side and a low pass filter 28 at the output side of the said converter.

IMAGING SYSTEMS

PLANT FOR MAGNETIC NOISE REDUCTION FOR A SQUIDMAGNETOMETER

PROCEDURE AND EQUIPMENT FOR THE CONTROL OF PRE-LOADING LEVELS IN A MAGNETOOPTIC RECORDING DEVICE

Method and apparatuses for detecting and regulating a DC component of the magnetization current of high-frequency power transformers in converter circuits

The invention relates to a method and to apparatuses for detecting and regulating a (local) DC component of the magnetization current of high-frequency transformers 2 which are fed by converter circuits 3. In this case, the magnetization current or the flooding compensation of the transformer is simulated by means of a current transformer 11 with an input winding 12 connected in series with the primary winding and, for a diode centre- point circuit, transformer input windings 13 and 14, which are connected in series with the transformer secondary windings 5 and 6 but have the opposite winding sense, and the signal 17 obtained in this way is in each case integrated over one pulse period by integrator stages 20, 21, which are arranged in parallel, operate in the form of a push-pull circuit, can be reset and have downstream sampling (follow-up) holding elements 22, 23, and, in the event of a local mean value of the magnetization current remaining, that is to say in the presence of a magnetization ...

DEVICE for ELECTROMAGNETIC multiposition MIXING with individual adjustment and control of OPERATION modes

СПОСОБ И УСТРОЙСТВО ДЛЯ КОМПЕНСАЦИИ НИЗКОЧАСТОТНОГО МАГНИТНОГО ПОЛЯ В ИНДУКТИВНОМ СИГНАЛЬНОМ УСТРОЙСТВЕ СВЯЗИ

В заявке описаны способ и устройство для компенсации низкочастотного магнитного поля в индуктивном сигнальном устройстве связи. Блок связи, к которому относится изобретение, имеет расположенный вокруг проводника, по которому протекает ток (1) низкой частоты, ферромагнитный сердечник (30), предназначенный для ввода в проводник сигнала высокой частоты. Предлагаемый в изобретении способ отличается тем, что измеряют ток (1), протекающий по проводнику, или возникающее в устройстве связи под действием этого тока магнитное поле (3), по результатам измерений определяют компенсирующий ток, который пропускают через фильтр (9) нижних частот и с помощью соответствующей обмотки вводят в ферромагнитный сердечник и создают магнитное поле (4), которое равно по величине и противоположно по направлению магнитному полю, создаваемому протекающим по проводнику током (1), что позволяет избежать насыщения магнитного сердечника (30) без дополнительных потерь, связанных с вводом в проводник высокочастотного сигнала ...

УСТРОЙСТВО ДЛЯ КОМПЕНСАЦИИ ЭЛЕКТРОМАГНИТНЫХ ПОМЕХ ПРИ ИЗМЕРЕНИЯХ БИОМАГНИТНЫХ СИГНАЛОВ

Изобретение относится к области сверхчувствительной биомагнитометрии при наличии внешних электромагнитных помех. Предлагается конструкция устройства для пассивной компенсации помех на входе биомагнитного измерителя, которая включает компенсационные элементы и средства их перемещения в составе узлов крепления, смещения и фиксации. В основной реализации применены три замкнутых проводящих контура, ориентированные ортогонально в пространстве, которые независимо перемещают вниз относительно измерителя или его входной антенны. Контуры фиксируют в положениях при достижении минимума амплитуды внешних помех по соответствующей проекции поля. Предложены варианты с охлаждением измерителя и/или контуров, размещением контуров внутри криостата и их выполнением из сверхпроводников.

СПОСОБ И УСТРОЙСТВО ДЛЯ КОМПЕНСАЦИИ НИЗКОЧАСТОТНОГО МАГНИТНОГО ПОЛЯ В ИНДУКТИВНОМ СИГНАЛЬНОМ УСТРОЙСТВЕ СВЯЗИ

В изобретении описаны способ и устройство для компенсации низкочастотного магнитного поля в индуктивном сигнальном устройстве связи. Блок связи, к которому относится изобретение, имеет расположенный вокруг проводника, по которому протекает ток (1) низкой частоты, ферромагнитный сердечник (30), предназначенный для ввода в проводник сигнала высокой частоты. Предлагаемый в изобретении способ отличается тем, что измеряют ток (1), протекающий по проводнику, или возникающее в устройстве связи под действием этого тока магнитное поле (3), по результатам измерений определяют компенсирующий ток, который пропускают через фильтр (9) нижних частот и с помощью соответствующей обмотки вводят в ферромагнитный сердечник и создают магнитное поле (4), которое равно по величине и противоположно по направлению магнитному полю, создаваемому протекающим по проводнику током (1), что позволяет избежать насыщения магнитного сердечника (30) без дополнительных потерь, связанных с вводом в проводник высокочастотного ...

Magnetic field intensity control device

The invention discloses a magnetic field intensity control device, and the device comprises a magnetic field detection module which is used for obtaining a magnetic field intensity measured value of a magnetic field generated by a magnetic field generator; the PID control module is used for carrying out PID adjustment on a first difference value between the magnetic field intensity measured value and the field sweeping initial value to obtain a first PID signal output value; the stable field DAC module comprises a first digital-to-analog conversion sub-module used for outputting a first magnetic field driving signal according to a first PID signal output value; the second digital-to-analog conversion sub-module is used for outputting a second magnetic field driving signal according to the first PID signal output value; the first control module is used for stabilizing the magnetic field intensity of the magnetic field generated by the magnetic field generator at a field scanning initial ...

Stabilising machine of magnetic fields

Assembly of order, in particular for the production of impulses of current of strong intensity

DISPOSITIF DE COMPENSATION DES CHAMPS MAGNETIQUES DE CORPS MOBILES

A L'INTERIEUR OU A L'EXTERIEUR DES CORPS MOBILES 1 SONT DISPOSES DES BOBINAGES 2 PORTEURS DU COURANT DONT LES MOMENTS MAGNETIQUES PEUVENT ETRE ASSERVIS, EN CE QUI CONCERNE LEUR INTENSITE ET LEUR ALLURE EN FONCTION DU TEMPS, A L'AIDE DE CAPTEURS MAGNETIQUES 3. DANS LE CAS DE CORPS NON ENTIEREMENT SYMETRIQUES, LE DEPLACEMENT DU CORPS MODIFIE L'INTENSITE ET LA DIRECTION DU CHAMP PROPRE. POUR OBTENIR UNE COMPENSATION DU CHAMP PROPRE MAGNETIQUE INDEPENDANTE DE L'ESPACE, DU TEMPS ET DE LA POSITION, AVEC UNE DEPENSE TECHNIQUE REDUITE LES SIGNAUX CAPTEURS SONT DIRIGES SUR UN MODELE MATHEMATIQUE QUI PREND EN COMPTE LES MECANISMES D'APPARITION DES CHAMPS PROPRES MAGNETIQUES ET LES CHAMPS DE COMPENSATION ET CONDUIT A DES SIGNAUX DE SORTIE QUI PILOTENT LES COURANTS DANS LES BOBINAGES POUR REDUIRE AU MINIMUM LE CHAMP MAGNETIQUE EXTERIEUR PROPRE DU CORPS.

SPECTROMETRE A RESONANCE MAGNETIQUE NUCLEAIRE

Spectromètre à résonance magnétique nucléaire comportant un système de verrouillage pour la stabilisation du champ magnétique en utilisant une grande proportion de circuits numériques. Le spectromètre comprend un transmetteur 16 permettant d'appliquer périodiquement, par l'intermédiaire de l'enroulement 20, un champ magnétique impulsionnel modulé en radiofréquence à l'échantillon 10 de façon à fournir des signaux de décroissance d'induction libre, et un circuit de verrouillage 40 relié par l'intermédiaire du transmetteur de verrouillage 32 au bobinage de champ 22 et modifiant le courant dans ledit bobinage de façon à maintenir la période des signaux de décroissance d'induction libre à une valeur constante prédéterminée. Un tel spectromètre est peu onéreux et très efficace.

ENTRAINEMENT ELECTROMAGNETIQUE D'UNE MACHINE DE SOUDAGE PAR FRICTION

L'ENTRAINEMENT ELECTROMAGNETIQUE POUR MACHINE DE SOUDAGE PAR FRICTION COMPORTE UN CIRCUIT MAGNETIQUE 1 IMMOBILE PORTANT UNE BOBINE D'ALIMENTATION 3 BRANCHEE SUR UN REGULATEUR DE TENSION 4 REALISE SOUS LA FORME D'UN COMMUTATEUR ET, AU MOINS, UNE BOBINE DE MESURE 5 BRANCHEE SUR UN INTEGRATEUR 6 FORMANT UNE TENSION PROPORTIONNELLE A LA VALEUR INSTANTANEE DU FLUX MAGNETIQUE DURANT LE SOUDAGE PAR FRICTION, L'INTEGRATEUR ETANT BRANCHE SUR UN DISPOSITIF DE COMPARAISON 11 QUI COMPORTE DEUX COMPARATEURS 13, 14, L'ENTREE DE CONSIGNE DE L'UN D'EUX ETANT ATTAQUEE PAR UNE TENSION PROPORTIONNELLE A LA VALEUR DE CONSIGNE DU FLUX MAGNETIQUE DURANT LE SOUDAGE PAR FRICTION, ALORS QUE L'ENTREE DE CONSIGNE DE L'AUTRE COMPARATEUR 14 EST ATTAQUEE PAR UNE TENSION PROPORTIONNELLE A UNE AUTRE VALEUR DE CONSIGNE DU FLUX MAGNETIQUE, ET UN CONFORMATEUR DE SIGNAUX DE COMMANDE 16, DONT LA CARACTERISTIQUE DE SORTIE A LA FORME D'UNE BOUCLE D'HYSTERESIS, ET QUI EST BRANCHE SUR LES COMPARATEURS 13, 14 ET DONT LA SORTIE ...

STABILIZING MAGNETIC FIELDS

Circuit of superstabilisation of a magnetic field

HYSTERESIS MOTORS

PROCESS TO FORM THE AMPLITUDE REFERENCE VOLTAGE OF A THREE PHASE INVERTER THAT POWERS A MOTOR WITH ROTOR IN FORM OF CAGE AND DEVICE FOR CARRYING OUT THE PROCESS

Method of regulating the magnetic field delivered by a resistive magnet, a resistive magnet system using this method and an installation for forming images by nuclear magnetic resonance incorporating such a system

A system is provided for regulating the field of a high homogeneity magnet. The fluid used for cooling the main magnet is placed in thermal contact with a high homogeneity auxiliary magnet in which is placed an NMR probe which controls the current supply to the two magnets connected in series.

CIRCUIT FOR THE COMPENSATION OF THE HORIZONTAL COMPONENT OF THE EARTH'S MAGNETIC FIELD FOR A COLOR PICTURE TUBE OF A HIGH-RESOLUTION MONITOR

Imaging systems

Nuclear magnetic resonance (NMR) apparatus have beenproposed for examining slices or volumes of bodies, perhaps for medical examination of patients. Magnetic fields are used to induce resonance in a selected region of a body and a resonance signal is detected during a pulse of a gradient field which causes phase dispersion across the region. It is now proposed that more efficient operation of the apparatus is possible if the gradient pulse is a non-square pulse, perhaps a distorted sinusoid, and the resonance signal is sampled during that pulse at intervals such that INTEGRAL Hdt is substantially equal between adjacent samples.

Device and method for generating and controlling a magnetic field strength

A device for generating and controlling a magnetic field strength and a method for generating and controlling a magnetic field strength are disclosed. The generation is very stable and precise. Preferably, reference values of physical variable can be generated relatively simply and economically. In addition, magnetic flux densities can be measured with high resolution and, in particular, highly robustly. The device and the method can also be used for transmitting information, in particular for ultra-wide band communication. The required devices can be very small, in particular miniature, and mobile.

Antenna diversity implementation for wireless locks

An electronic lock system including an access control device configured to provide system instructions, an interface module electrically coupled to the access control device and configured to transmit RF signals in response to system instructions received from the access control device, and a plurality of wireless electronic door locks each configured to wirelessly communicate with the interface module. Each of the wireless electronic door locks includes a controller and a wireless receiver operatively connected to the controller, the wireless receiver including a first antenna defined as a circuit board trace and a second antenna, spaced from the first antenna and defined as a circuit board trace. Each of the first antenna and the second antenna include one of a monopole antenna and a fractal antenna. The controller is configured to switch between the first antenna and the second antenna to receive a wireless signal having a greater signal strength.

УСТРОЙСТВО ДЛЯ ДЕМОНСТРАЦИИ ЗАКОНОВ ЭЛЕКТРОДИНАМИКИ

Предложено устройство для демонстрации законов электродинамики содержащее основание, устройство крепления тела вращения, блок ждущего генератора с индуктивной катушкой, источник питания, тело вращения с магнитом, ось намагничивания которого перпендикулярна его оси вращения. Отличием предлагаемого вращающегося устройства от известных решений является то, что ось намагничивания индуктивной катушки параллельна оси намагничивания магнита. Это позволяет расширить функциональные возможности устройства, снизить энергопотребление, повысить зрелищный эффект. Предложены различные конструктивные варианты. Предлагаемое устройство может быть использовано как игрушка, а также как средство научно-технического досуга или наглядное пособие.

СПОСОБ УПРАВЛЕНИЯ МАГНИТНЫМ ПОТОКОМ, СОЗДАВАЕМЫМ ПОСТОЯННЫМ МАГНИТОМ, И УСТРОЙСТВО ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ

FIELD: conversion of magnetic energy of permanent magnets to various forms of energy (mechanical, electrical, thermal, light, etc). SUBSTANCE: method proposes principle of control over magnetic flux by controlling magnetic resistance of magnetic shunt in circuit of permanent magnet. This principle determines operation of device implementing given method as amplifier of magnetic flux. EFFECT: expanded range of adjustment of value of magnetic flux depending on preset adjustment law, simplified design and adjustment process. 7 cl, 6 dwg ссбс60с ПЧ Го РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) ВИ” 2 092 922'° С1 МН ОЛЕ 7/04 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 96107045107, 18.04.1996 (46) Дата публикации: 10.10.1997 (56) Ссылки: Верников А.Я. Магнитные и электромагнитные приспособления в металлообработке. - М.: Машиностроение, 1984, с.5-23. (71) Заявитель: Акционерное общество закрытого типа "ВИК" (72) Изобретатель: Королев Э.Г., Колончин В.С. (73) Патентообладатель: Акционерное общество закрытого типа "ВИК" С1 (54) СПОСОБ УПРАВЛЕНИЯ МАГНИТНЫМ ПОТОКОМ, УСТРОЙСТВО ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ (57) Реферат: Использование: изобретение относится к технике, использующей различные виды устройств, преобразующих магнитную энергию постоянных магнитов В разнообразные виды энергии (механическую, электрическую, тепловую, световую и другие). Сущность: в способе предложен принцип управления магнитным потоком путем управления рабочим магнитным сопротивлением магнитного шунта в цепи постоянного магнита. Этот принцип определяет работу устройства, реализующего данный способ как усилителя магнитного потока. Изобретение позволяет расширить диапазон регулирования величины магнитного потока в зависимости от заданного закона регулирования, упростить устройство и процесс регулирования. 2 с. и 5 3. п. ф-пы, б ил. СОЗДАВАЕМЫМ ПОСТОЯННЫМ МАГНИТОМ, И а аиеи 2092922 Рим КО на фиг. 1 ссбс60с ПЧ Го КУЗЗАМ АСЕМСУ ГОК РАТЕМТ$ АМО ТКАОЕМАКК$ (19) (51) 1пЕ. С1. ...

Способ изготовления обмоток возбуждения магнитных линз

Стабилизатор магнитного поля

Изобретение относится к устройствам создания магнитных полей с точно заданным значением магнитной индукции. Целью изобретения является повышение стабильности магнитного поля путем исключения влияния дестабилизирующих факторов на частоту автодина. Цель достигается за счет введения в схему цифрового измерителя 3 частоты, блока 6 сопряжения, узла 8 индикации и клавишного пульта 10. Эти элементы вместе с введенным цифроаналоговым преобразователем 9 образуют петлю динамического авторегулирования на программном уровне резонансной частоты автодина. Благодаря этому обеспечивается непосредственное изменение частоты автодина с любой заданной точностью. 2 ил.

Устройство для стабилизацииНАпРяжЕННОСТи пОСТОяННОгО МАгНиТНОгОпОля

Устройство питания электромагнита

УСТРОЙСТВО ПИТАНИЯ ЭЛЕКТРОМАГНИТА, содержащее регуЛ1фуюиа1й элемент, включенный Б силовую шину между BXOjEuibiM выводом и выводом ддя подключения обмотки электромагниKtm ysKe п ,,13 Ы vv-. i, -; , Л. та, управляктдай вьшод регулирующего элемента соединен с выходом усипирель- нр-измерительного элемента, один вход . которого подключен к источнику опорно-, го напряжения, а другой - к выводу для подключения обмотки элекцзом(№ннрга и нерез, по крайней мере, один переключатель - к соответствующему эталонному резистору, другой вывод которого соёдвн нен с общей шиной, отличают ©-. ее я тем, что, с целью улучшения энергетических характеристик, в нем параллельно эталонному резистору подг . ключен введенный конденсатор. (Л Ьо 00 ...

MAGNETIC RESONANCE IMAGING APPARATUS AND VIBRATIONAL ERROR MAGNETIC FIELD REDUCTION METHOD

Regardless of the measurement conditions, the degradation of the image quality due to a vibrational error magnetic field, which is generated by the vibration of the mechanical structure of an MRI apparatus, is reduced. In order to do so, error magnetic field image data indicating an error magnetic field distribution is acquired on the basis of an echo signal measured using a pulse sequence having a test gradient magnetic field, a parameter value of a damped vibration function showing a vibrational error magnetic field is calculated using the error magnetic field image data, and a correction magnetic field is calculated on the basis of the calculated parameter value of the damped vibration function showing the vibrational error magnetic field. 1. A magnetic resonance imaging apparatus comprising:a static magnetic field generation unit that generates a static magnetic field in imaging space;a gradient magnetic field generation unit that generates a gradient magnetic field so as to be superimposed on the static magnetic field;a correction magnetic field generation unit that generates a correction magnetic field for correcting an error magnetic field generated in the imaging space due to application of the gradient magnetic field;a structural unit that supports the static magnetic field generation unit, the gradient magnetic field generation unit, and the correction magnetic field generation unit mounted inside;a measurement control unit that measures an echo signal from an object disposed in the imaging space on the basis of a predetermined pulse sequence; anda correction magnetic field calculation unit that calculates a correction magnetic field for correcting an error magnetic field generated in the imaging space due to application of the gradient magnetic field,wherein the correction magnetic field calculation unit calculates an error magnetic field including a vibrational error magnetic field based on vibration of the structural unit due to application of the ...

DEVICE AND METHOD FOR REDUCING A MAGNETIC UNIDIRECTIONAL FLUX FRACTION IN THE CORE OF A TRANSFORMER

A device for reducing a magnetic unidirectional flux fraction in the core of a transformer is provided. The device has a measuring device that provides a sensor signal corresponding to the magnetic unidirectional flux fraction, a compensation winding that is magnetically coupled to the core of the transformer, a switching unit arranged electrically in a current path in series with the compensation winding in order to feed a current into the compensation winding. The action of the current is directed opposite to the unidirectional flux fraction. The switching unit can be controlled by a regulating variable provided by a control device and can be switched into a conductive state during a predefined time interval and in accordance with the regulating variable, the switch-on time being mains-synchronous. A device for limiting the current in the current path is provided and the sensor signal is fed to the control device. 117-. (canceled)18. A device for reducing a magnetic unidirectional flux fraction in a core of a transformer , comprising:a measuring device that provides a sensor signal corresponding to the magnetic unidirectional flux fraction;a compensation winding that is coupled magnetically to the core of the transformer;a switching unit that is arranged electrically in a current path in series with the compensation winding in order to feed a current into the compensation winding; anda control device that provides a regulating variable,wherein an action of the current is directed opposite to the unidirectional flux fraction,wherein the switching unit is controlled by the regulating variable,wherein the switching unit is switched into a conductive state during a predefined time interval with a mains-synchronous switch-on time and in accordance with the regulating variable,wherein a mechanism for limiting the current in the current path is provided, andwherein the sensor signal is fed to the control device.19. The device as claimed in claim 18 , wherein the ...

SYSTEMS AND METHODS FOR MAGNETIC SHIELDING

Systems and methods for magnetic shielding are described. A magnetic shield formed of a material having a high magnetic permeability may be degaussed using a toroidal degaussing coil. The toroidal degaussing coil may enclose at least a portion of the shield. Magnetic field gradients may be actively compensated using multiple magnetic field sensors and local compensation coils. Trapped fluxons may be removed by an application of Lorentz force wherein an electrical current is passed through a superconducting plane. 1. A system for compensating for a magnetic field gradient across an area , the system comprising:at least two magnetic field sensors respectively positioned at opposite ends of the area;at least two compensation coils respectively positioned proximate opposite ends of the area; andat least a first current source.2. The system for compensating for a magnetic field gradient from wherein the at least two compensation coils are electrically coupled in series with one another and both coupled to the first current source.3. The system for compensating for a magnetic field gradient from claim 1 , further comprising a second current source claim 1 , wherein a first compensation coil is electrically coupled to the first current source and a second compensation coil is electrically coupled to the second current source.4. The system for compensating for a magnetic field gradient from wherein the at least two compensation coils are respectively positioned proximate opposite ends along a width of the area claim 1 , and further comprising:at least two additional compensation coils that are respectively positioned proximate opposite ends along a length of the area.5. The system for compensating for a magnetic field gradient from wherein the at least two magnetic field sensors are respectively positioned at opposite ends along the width of the area claim 4 , and further comprising at least two additional magnetic field sensors that are respectively positioned at opposite ...

SHIELDING APPARATUS, SHIELDING METHOD AND DEMAGNETIZING FOR MEASURING MAGNETIC FIELD

The present invention relates to a shield apparatus and a shield method for measuring a subtle magnetic field. More specifically, the present invention relates to a shield apparatus having a precise magnetic sensor therein, for shielding an external magnetic field in a subtle magnetic field measurement apparatus including a magnetic field generation apparatus for exciting a sample, the shield apparatus for measuring a subtle magnetic field, including: a shield wall provided with a high-conductivity metal layer of high conductivity being partitioned into a plurality of segments and having a high-frequency shield property and a closed high-permeability soft magnetic layer spaced apart from the high-conductivity metal layer by a predetermined distance, so as to seal a measurement space. 1. A shield apparatus having a precise magnetic sensor therein , for shielding an external magnetic field in a subtle magnetic field measurement apparatus including a magnetic field generation apparatus for exciting a sample , the shield apparatus for measuring a subtle magnetic field , comprising:a shield wall provided with a high-conductivity metal layer of high conductivity being partitioned into a plurality of segments and having a high-frequency shield property and a closed high-permeability soft magnetic layer spaced apart from the high-conductivity metal layer by a predetermined distance, so as to seal a measurement space, wherein the external magnetic field is shielded, and flow of eddy current induced by an excitation magnetic field generated by the magnetic field generation apparatus is cut off, so that a magnetic field generated by the eddy current does not interfere with measuring the subtle magnetic field.2. The shield apparatus according to claim 1 , wherein the shield wall is formed as multiple walls claim 1 , and all surfaces of the high-conductivity metal layer configuring an outermost shield wall are closed.3. The shield apparatus according to claim 2 , wherein the ...

HEV ROBUST ALGORITHMS FOR MAGNETIC SPEED SENSOR FOR ENGINE APPLICATIONS

Magnetic field sensors and sensing methods are provided. A magnetic sensor module is configured to measure a magnetic field whose magnitude oscillates between a first extrema and a second extrema. The magnetic sensor module includes a magnetic sensor configured to generate measurement values in response to sensing the magnetic field, and a sensor circuit. The sensor circuit is configured to generate a measurement signal based on the measurement values, adjust an offset of the measurement signal according to an offset update algorithm and a first characteristic of the measurement signal, generate a pulsed output signal having pulses that are generated based on the adjusted measurement signal crossing the switching threshold, and selectively enable and disable the offset update algorithm based on a second characteristic of the measurement signal. 1. A magnetic sensor module configured to measure a magnetic field whose magnitude oscillates between a first extrema and a second extrema , the magnetic sensor module comprising:a magnetic sensor including a plurality of sensor elements configured to generate measurement values in response to sensing the magnetic field; and receive the measurement values from at least one of the plurality of sensor elements, and generate a measurement signal based on the measurement values received from the at least one of the plurality of sensor elements,', 'measure a first characteristic of the measurement signal and adjust an offset of the measurement signal according to an offset update algorithm based on the measured first characteristic of the measurement signal;', 'compare the adjusted measurement signal to a switching threshold, and generate a pulsed output signal having pulses that are generated based on the adjusted measurement signal crossing the switching threshold,', 'measure a second characteristic of the measurement signal, and', 'selectively enable and disable the offset update algorithm based on at least the second ...

RESETTABLE CLOSED-LOOP MULTI-TURN MAGNETIC SENSOR

Aspects of this disclosure relate to a resettable closed-loop multi-turn magnetic sensor. In one aspect, the sensor includes a nanowire forming a plurality of loops, a plurality of domain orientation sensors configured to detect locations of a pair of domain walls within the nanowire, and an initialization circuit configured to inject the pair of domain walls into the nanowire. The nanowire forms a closed-loop via a bridge crossing connecting two of the loops. 1. A multi-turn magnetic sensor , comprising:a nanowire forming a plurality of loops;a plurality of domain orientation sensors configured to detect locations of a pair of domain walls within the nanowire; andan initialization circuit configured to inject the pair of domain walls into the nanowire,wherein the nanowire forms a closed-loop via a bridge crossing connecting two of the loops.2. The sensor of wherein the bridge allows the pair of domain walls to propagate around the entirety of the nanowire without annihilating the pair of domain walls.3. The sensor of wherein the initialization circuit comprises a first set of metal traces that cross each loop of the plurality of loops at a first crossing and a second crossing claim 1 , a first spacing between the metal traces at the first crossing being different that a second spacing between the metal traces at the second crossing.4. The sensor of wherein the initialization circuit further comprises a second set of metal traces that cross a first loop of the plurality of loops at a third crossing and a sixth crossing and other loops of the plurality of loops at a fourth crossing and a fifth crossing claim 3 , wherein the second set of metal traces have the first spacing at the fourth and sixth crossings and the second spacing at the third and fifth crossings.5. The sensor of wherein the first spacing is narrower than the second spacing.6. The sensor of wherein the initialization circuit comprises a plurality of metal traces and wherein the initialization circuit ...

Stationary Induction Electric Apparatus

A polyphase stationary induction electric apparatus includes an N-phase N-leg main magnetic path (where N is 3 or more); a main winding wound around each main leg; and a control magnetic flux generating unit that generates a control magnetic flux having a magnitude variable in a direction substantially orthogonal to any one of N-phase main magnetic fluxes at an intersection part of N main legs; the control magnetic flux generating unit controlling the magnitude of the control magnetic flux to make N-phase reactance variable. 1. A polyphase stationary induction electric apparatus comprising:an N-phase N-leg main magnetic path (where N is 3 or more);a main winding wound around each main leg; anda control magnetic flux generating unit that generates a control magnetic flux having a magnitude variable in a direction substantially orthogonal to any one of N-phase main magnetic fluxes at an intersection part of N main legs;the control magnetic flux generating unit controlling the magnitude of the control magnetic flux to make N-phase reactance variable.2. The polyphase stationary induction electric apparatus according to claim 1 , wherein the intersection part is formed to have a shape of 360°/N rotational symmetry.3. The polyphase stationary induction electric apparatus according to claim 1 , wherein a control magnetic flux of an axisymmetric shape is generated at the intersection part.4. The polyphase stationary induction electric apparatus according to claim 1 , wherein the control magnetic flux generating unit has a compensating winding which suppresses temporal variation in the magnitude of the control magnetic flux. This application is based upon and claims the benefit of priority to the Japanese Patent Application No. 2014-173426, filed on Aug. 28, 2014, the entire contents of which are incorporated herein by reference.1. Field of the InventionThe present invention relates to a polyphase stationary induction electric apparatus in which reactance is variable, and ...

MRI GRADIENT TRAJECTORY MAPPING

Magnetic field temporal variations in magnetic resonance imaging (MRI) volume are determined based on the slope of a phase difference Δφ between spin responses in plural slices at a given temporal sampling time. Representations of the determined temporal magnetic field variations are stored for subsequent use, e.g., to achieve more accurate re-gridding of acquired k-space date before reconstruction of images in the spatial domain. 1. A magnetic resonance imaging (MRI) system comprising:an assembly of gantry components including static and gradient magnetic field generators and at least one radio frequency (RF) coil defining an imaging volume;an MRI control system, connected to control said gantry components, including at least one RF transmitter, at least one RF receiver and computer control circuits configured to effect specified MRI data acquisition sequences of RF and gradient magnetic pulses which acquire, from an object located within said imaging volume, RF nuclear magnetic resonance (NMR) spin responses emanating from different spatially located volumes of NMR nuclei respectively corresponding to different positions in k-space as a function of a magnetic field experienced by the nuclei; [{'sub': 'i,j', '(A) for each of a series of slices j, a data acquisition sequence using (a) RF and slice select magnetic gradient pulses followed by (b) at least one magnetic gradient pulse, having a same magnitude if more than one and being in a same direction as said slice select magnetic gradient pulse but under a predetermined stress condition, located at least partly within an analog-to-digital converter (ADC) window providing successive temporal samples i of NMR phase responses Φ,'}, '(B) determining magnetic field temporal variations at each sample point i based on the slope of the phase difference ΔΦ between plural slices j at temporal sampling time i, and', '(C) storing representations of the determined temporal magnetic field variations for subsequent use in MRI ...

HEV ROBUST ALGORITHMS FOR MAGNETIC SPEED SENSOR FOR ENGINE APPLICATIONS

Magnetic field sensors and sensing methods are provided. A magnetic sensor module is configured to measure a magnetic field whose magnitude oscillates between a first extrema and a second extrema. The magnetic sensor module includes a magnetic sensor configured to generate measurement values in response to sensing the magnetic field, and a sensor circuit. The sensor circuit is configured to generate a measurement signal based on the measurement values, compare the measurement signal to a switching threshold, generate a pulsed output signal having pulses that are generated based on the measurement signal crossing the switching threshold, measure a first characteristic of the measurement signal, update an offset of the switching threshold according to an offset update algorithm based on the measured first characteristic of the measurement signal, and selectively enable and disable the offset update algorithm based on at least a second characteristic of the measurement signal. 1. A magnetic sensor module configured to measure a magnetic field whose magnitude oscillates between a first extrema and a second extrema , the magnetic sensor module comprising:a magnetic sensor including a plurality of sensor elements configured to generate measurement values in response to sensing the magnetic field; and receive the measurement values from at least one of the plurality of sensor elements, and generate a measurement signal based on the measurement values received from the at least one of the plurality of sensor elements,', 'compare the measurement signal to a switching threshold, and generate a pulsed output signal having pulses that are generated based on the measurement signal crossing the switching threshold,', 'measure a first characteristic of the measurement signal and update an offset of the switching threshold according to an offset update algorithm based on the measured first characteristic of the measurement signal, and', 'selectively enable and disable the offset ...

ENERGY SUPPLY DEVICE FOR EXPLOSION-PROOF ELECTRONIC FUNCTIONAL UNITS

An exemplary energy supply device for explosion-proof electronic functional units includes a plurality of inductors. The functional units are supplied from a high-frequency AC voltage that is individually output for each of the functional units via an inductor. In order to supply a multiplicity of functional units with little effort, the multi-level printed circuit board of each inductor is at least partially covered with a flat board of a magnetic material parallel to the plane of its conductor tracks. 1. An energy supply device for explosion-proof electronic functional units , in which the functional units are supplied from a high-frequency AC voltage which is individually output for each of the functional units , the device comprising:a plurality of inductors, each inductor is connected to provide the AC voltage to a respective functional unit, and is formed of substantially congruent conductor tracks of a multi-level printed circuit board,wherein the multilevel printed circuit boards of the plurality of inductors are connected to one another, andwherein the multi-level printed circuit board of each inductor is at least partially covered with a flat board of a magnetic material parallel to a plane of the conductor tracks.2. The energy supply device as claimed in claim 1 , wherein each inductor consists of two windings with an opposite winding sense.3. The energy supply device as claimed in claim 1 , wherein each flat board includes ferrite material.4. The energy supply device as claimed in claim 1 , wherein each flat board is arranged between two adjacent inductors.5. The energy supply device as claimed in claim 1 , wherein each flat board is adhesively bonded to a respective inductor.6. The energy supply device as claimed in claim 1 , wherein each inductor a least partially covered by the flat board of magnetic material is also at least partially surrounded by the flat board of magnetic material. This application claims priority under 35 U.S.C. §119 to German ...

MAGNETIC RESONANCE IMAGING DEVICE

A device includes: a static magnetic field generating device including static magnetic field generating sources generating a homogeneous magnetic field in a space; gradient magnetic field generating sources superimposing a gradient magnetic field on the homogeneous magnetic field, and conductor rings arranged between the static magnetic field generating sources and the gradient magnetic field generating sources in a pair of arranging regions on both sides in a direction of the homogeneous magnetic field in a region where the homogeneous magnetic field is generated (imaging region), respectively, the conductor rings being separated from each other and making a pair. The conductor rings are mechanically connected to the gradient magnetic field generating device or the static magnetic field generating device. This provides an MRI device 1 capable of reduction in vibration with suppression of the image quality deterioration of the tomographic images. 1. A magnetic resonance imaging device comprising:a static magnetic field generating device including a static magnetic field generating source generating a homogeneous magnetic field in a space;a gradient magnetic field generating device including a gradient magnetic field generating source superimposing a gradient magnetic field on the homogeneous magnetic field;conductor rings arranged between the static magnetic field generating source and the gradient magnetic field generating source in a pair of arranging regions on both sides, in a direction of the homogeneous magnetic field, of a region of the homogeneous magnetic field, respectively, the conductor rings being separated from each other and making a pair.2. The magnetic resonance imaging device as claimed in claim 1 , wherein a plurality of conductor rings are arranged in a pair of the arranging regions claim 1 , respectively.3. The magnetic resonance imaging device as claimed in claim 1 , wherein conductor rings are mechanically connected to the gradient magnetic ...

METHOD FOR DYNAMICALLY REDUCING PEAK ELECTROMAGNETIC INTERFERENCE FROM A GROUP OF SWITCHING DEVICES CONNECTED ON A COMMUNICATIONS BUS

The system and method for dynamically reducing the peak electromagnetic interference produced by a group of electrical or electronic switching devices connected to a common communications bus. The system and method includes a fixed range of frequencies that includes frequencies emitted by the group of switching devices during normal operation and subranges of frequencies within the fixed range of frequencies, each subrange of frequencies being associated with a unique bus address of one switching device in the group of switching devices. Each subrange of frequencies being determined by the unique bus address of its associated switching device and characteristic weights dynamically determined and/or assigned to its associated switching device and/or load by a microprocessor implemented algorithm. 1. A system for reducing a peak electromagnetic interference produced by each switching device of a group of switching devices connected to a communications bus , the system comprising:a controller having a microprocessor and a non-transitory memory associated with the microprocessor, the non-transitory memory storing an algorithm implemented by the microprocessor and characteristics of the switching devices and/or loads controlled by the switching devices;a fixed range of frequencies, the fixed range of frequencies including frequencies emitted by the group of switching devices during normal operation;a subrange of frequencies associated with each switching device in the group of switching devices, each subrange of frequencies being dynamically determined by the characteristics of its associated switching device and/or the load controlled by its associated switching device; anda timer associated with each switching device, the timer using a maximum and a minimum frequency of the subrange of frequencies associated with its associated switching device to spread the peak frequency of that associated switching device over its associated subrange of frequencies.2. The system of ...

MAGNETIC RESONANCE EXAMINATION SYSTEM WITH FIELD PROBES

A magnetic resonance examination system is disclosed comprising a field probe system to measure the magnetic field distribution of the main magnetic field and gradient magnetic field. The measurements are made in an earlier configuration and yield the resultant magnetic field due to gradient switching or external causes. From the measured resultant magnetic field the response relation is derived and stored in the memory. The response relation from the memory is available for compensating activation of the gradient fields or correction in reconstruction for the response relation in reconstruction. This compensation or correction can be carried-out in a current configuration. Thus is the current configuration to field probes are needed. 1. A magnetic resonance examination system having an examination zone and comprisinga main magnet to generate a stationary main magnetic field in the examination zone and a reconstruction module configured to access respective sets of magnetic resonance imaging signals from the examination zone at a current configuration and at an earlier configuration', 'reconstruct an magnetic resonance images from the sets of magnetic resonance imaging signals acquired at the earlier and current configurations, 'a gradient system with one or more gradient coils to generate a gradient magnetic field in the examination zone'} several field probes to measure a magnetic field distribution in the examination zone (i) due to a switching operation of the gradient system and/or (ii) due to a magnetic field disturbance originating externally,', to control the field probe system and configured to activate the field probe system to measure the magnetic field distribution in an earlier configuration simultaneously with the acquisition of the magnetic imaging resonance signals in the earlier configuration and', 'to determine a response relation representing the measured magnetic field distribution in the earlier configuration and i) due to said switching ...

MAGNETIC FIELD MEASUREMENT CABLE AND DISTRIBUTED-TYPE WELL INSIDE MAGNETIC FIELD MEASUREMENT SYSTEM

A magnetic field measurement cable () of the present disclosure includes an electric cable () provided at an axial part, and an outer circumferential cable () provided on the outer side of the electric cable () and helically formed by a plurality of steel wires helically wound and a magnetic field measurement optical cable () having an optical fiber cable (). 1. A magnetic field measurement cable including an optical fiber for measuring a magnetic field at a predetermined location , the magnetic field measurement cable comprising:an electric cable provided at an axial part of the magnetic field measurement cable; andan outer circumferential cable including a plurality of cables and an optical cable composed of the optical fiber and a plurality of steel wires helically wound so as to surround the optical fiber, the plurality of cables and the optical cable being helically wound so as to surround an outer circumference of the electric cable,the magnetic field measurement cable being configured to detect frequency shift of scattering light of the optical fiber placed at the predetermined location.2. The magnetic field measurement cable according to claim 1 , whereinthe outer circumferential cable includes a first outer circumferential cable provided on an inner circumferential side and a second outer circumferential cable provided on an outer circumferential side,the first outer circumferential cable includes a temperature measurement optical fiber built-in cable, andthe optical cable is disposed in the second outer circumferential cable.3. A distributed-type well inside magnetic field measurement system comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the magnetic field measurement cable according to ; and'}a calculation device which performs calculation on a signal and performs storage, whereinon the basis of a relationship between a magnetic field and frequency shift of scattering light of an optical fiber calculated through measurement in advance, the ...

DEVICE AND METHOD FOR GENERATING A CORRECTIVE MAGNETIC FIELD FOR FERRITE-BASED CIRCUITS

A demagnetizing device includes, in one embodiment, a demagnetizer. The demagnetizer is operable to generate a corrective magnetic field. The corrective magnetic field is operable to act upon a ferrite-based core to maintain suitable performance of a network-connected device which includes such core. 1. A demagnetizing device comprising:a circuit configured to be operatively coupled to an apparatus, the apparatus comprising a first signal circuit portion and at least one ferrite component, the apparatus being electrically connected to a coaxial cable that transmits data signals, the coaxial cable being electrically connected to a data network, wherein the first signal circuit portion is configured to receive a first parallel part of a transient signal and the data signals, and the first parallel part of the transient signal is operable to magnetize the at least one component, the magnetization being operable to cause a performance of the apparatus to drop from a designated performance level to a lower performance level with respect to receiving and transmitting the data signals,wherein the circuit comprises a second signal circuit portion and a demagnetizing coil, the second signal circuit portion configured to receive a second parallel part of the transient signal in parallel with the first signal circuit portion receiving the first parallel part of the transient signal, the demagnetizing coil configured to operate based on the second parallel part of the transient signal, the demagnetizing coil being operable to cause a continuous reduction in the magnetization of the at least one ferrite component so that the performance of the apparatus is maintained to be at least as good as the designated performance level with respect to receiving and transmitting the data signals.2. The demagnetizing device of claim 1 , wherein the ferrite component comprises a splitter transformer.3. The demagnetizing device of claim 1 , wherein first signal circuit portion and the second ...

MAGNETIC SENSOR AND MAGNETIC SENSOR APPARATUS

A magnetic sensor of an embodiment includes: a magnetic field detector including a magnetic layer in which a length in a first direction is 10 times or more of a length in a second direction perpendicular to the first direction and a length in a third direction perpendicular to the first direction and the second direction is ½ or less of the length in the second direction; a first magnetic material member arranged along the first direction, and in which a length in the third direction is longer than the length in the third direction of the magnetic layer; a first nonmagnetic insulating layer arranged between the magnetic field detector and the first magnetic material member, and in which a length in the second direction is ½ or less of the length in the second direction of the magnetic layer; and a circuit supplying current to the magnetic layer. 1. A magnetic sensor comprising:a magnetic field detector including a magnetic layer in which a length in a first direction is 10 times or more of a length in a second direction perpendicular to the first direction and a length in a third direction perpendicular to the first direction and the second direction is ½ or less of the length in the second direction;a first magnetic material member that is arranged along the first direction of the magnetic field detector, and in which a length in the third direction is longer than the length in the third direction of the magnetic layer;a first nonmagnetic insulating layer that is arranged between the magnetic field detector and the first magnetic material member, and in which a length in the second direction is ½ or less of the length in the second direction of the magnetic layer; anda circuit configured to supply current to the magnetic layer.2. The sensor according to claim 1 , whereinthe magnetic field detector includes a plurality of magnetic layers, and the plurality of magnetic layers is arranged in parallel in the second direction and connected to each other in series.3. ...

MAGNETIC FIELD SHIELDING APPARATUS

Disclosed is a magnetic field shielding apparatus including an energy transmitter configured to generate a magnetic field, an energy receiver configured to receive the magnetic field generated by the energy transmitter, and a magnetic shield configured to shield a leaked magnetic field that is not received by the energy receiver, the magnetic shield including at least one closed region through which the leaked magnetic field passes, and at least one open region including a protrusion through which the leaked magnetic field moves to an inside of the magnetic field shielding apparatus after absorbed into the closed region. 1. A magnetic field shielding apparatus , comprising:an energy transmitter configured to generate a magnetic field;an energy receiver configured to receive the magnetic field generated by the energy transmitter; anda magnetic shield configured to shield a leaked magnetic field that is not received by the energy receiver,wherein the magnetic shield comprises at least one closed region through which the leaked magnetic field passes, and at least one open region including a protrusion through which the leaked magnetic field moves to an inside of the magnetic field shielding apparatus after absorbed into the closed region.2. The magnetic field shielding apparatus of claim 1 , wherein the closed region comprises:a first closed region into which the leaked magnetic field is absorbed or through which the leaked magnetic field passes from the inside of the magnetic field shielding apparatus to an outside thereof; anda second closed region through which the magnetic field passing through the first closed region passes from the outside of the magnetic field shielding apparatus to the inside thereof.3. The magnetic field shielding apparatus of claim 1 , wherein a portion of the open region through which an electronic device configured to obtain energy from the energy transmitter and the energy receiver is to be inserted is configured to have a greater width ...

ARRANGEMENT ALLOWING THE PERFORMANCE OF BOTH MAGNETIC PARTICLE IMAGING AND MAGNETIC RESONANCE IMAGING AND A DEVICE COMPRISING THIS ARRANGEMENT

An arrangement that enables performing of both magnetic particle imaging and magnetic resonance imaging and a device including the arrangement are provided. The arrangement that enables performance of both magnetic particle imaging and magnetic resonance imaging includes: at least one primary magnetic element pair configured to generate a selection magnetic field (SMF/SMF) for magnetic particle imaging, at least one secondary magnetic element pair configured to generate a driving magnetic field, and at least one tertiary magnetic element pair configured to generate a focus magnetic field (FMF). 1. An arrangement for performing both magnetic particle imaging and magnetic resonance imaging , comprising:{'b': 1', '2, 'at least one primary magnetic element pair configured to generate a selection magnetic field (SMF/SMF),'}at least one secondary magnetic element pair configured to generate a driving magnetic field, [{'b': 1', '2, 'wherein the at least one primary magnetic element pair is configured to generate a first magnetic field gradient (SMF/SMF) in a first plane, and a first axis (X) and a second axis (Y) substantially perpendicular to the first axis (X) extend on the first plane,'}, 'in the same imaging region (IR) for the magnetic particle imaging, the at least one secondary magnetic element pair is configured to generate a second magnetic field gradient in', 'a third axis (Z) substantially perpendicular to the first plane for the magnetic resonance imaging,', 'the at least one tertiary magnetic element pair is configured to form a first high homogeneity magnetic field (FMF) for the magnetic resonance imaging,, 'at least one tertiary magnetic element pair configured to form a focus magnetic field (FMF) in an imaging region (IR) for the magnetic particle imaging,'}at least one transmitting magnetic element pair configured to excite nuclear spins in a second high homogeneity magnetic field (FMF) for the magnetic resonance imaging, andat least one first receiving ...

MAGNETOMETER COMPENSATION

A system and method that compensates for local disturbances in magnetometer measurements for working equipment. For example, compensating for magnetometer disturbances caused by a stick, boom, and bucket of an excavator. The compensation is performed by generating or obtaining a magnetic model of movable members, determining the position of each of the movable members, calculating an estimated magnetic disturbance, and modifying the magnetometer measurement. 1. A method of providing calibration or compensation for a magnetometer located on a construction vehicle or mining vehicle , the method comprising:identifying one or more members of the vehicle that are movable relative to the magnetometer;obtaining a magnetic model of each identified members, wherein the magnetic model comprises an array of one or more magnetic dipoles;determining the relative position of each identified member;taking a magnetometer measurement;calculating an estimated magnetic disturbance caused by the one or more members using the magnetic model and relative position of each identified member; andmodifying the magnetometer measurement according to the estimated magnetic disturbance.2. The method of claim 1 , wherein the array is at least two dimensional.3. The method of claim 1 , wherein each array varies relative to the others.4. The method of claim 1 , wherein the spacing between dipoles within an array varies.5. The method of claim 1 , wherein the array of dipoles is aligned along a reference axis relative to the identified member claim 1 , wherein the reference axis corresponds to a longitudinal or major axis of the member.6. (canceled)7. The method of claim 5 , wherein the reference axis is selected to maximise the number of elements of an array that correspond to a position of the member.8. The method of claim 1 , wherein the size of the array of magnetic dipoles for each member is determined to prevent under-fitting or over-fitting.9. The method of claim 1 , further comprising the ...

Circuit and method for providing a constant magnetic field to actuate electromechanical relays and contactors over a large temperature range

A circuit and method for controlling a voltage applied to a coil to actuate electromechanical relays or contactors. The strength of a magnetic field operating the coil is a function of the product of the number of turns of the coil wire and the magnitude of current, in amperes, passing through the coil wire. An adjustable voltage regulator provides a regulated voltage as an output to a first terminal of a coil to energize the coil based on the temperature of the coil as sensed by a temperature sensing device located proximate the coil. The regulated voltage is controlled based on the sensed coil temperature to consistently provide a current of optimal magnitude to actuate the coil at the sensed temperature. A transient voltage suppression circuit may be used with the coil to suppress back electromotive force generated currents and voltages when the coil is de-energized.

ARRANGEMENT FOR MODIFYING A MAIN MAGNETIC FIELD AND METHOD FOR PRODUCING SUCH AN ARRANGEMENT

A carrier structure () of an arrangement () for modifying a main magnetic field generated in a magnetic resonance tomograph from multiple carrier elements (). A conductor arrangement () is respectively arranged on each carrier element (). The conductor arrangements () respectively comprise a primary conductor arrangement () for generating a primary magnetic field that modifies the main magnetic field and a secondary conductor arrangement () for shielding the primary magnetic field. A method for producing a modularly constructible arrangement (), which can be used for example for spatial encoding. 1123374337467. An arrangement () for modifying a main magnetic field generated in a magnetic resonance tomograph , comprising a carrier structure () having at least three carrier elements ( , ) , a conductor arrangement () is respectively arranged on the carrier elements ( , ) and the conductor arrangements () respectively comprise a primary conductor arrangement () for generating a primary magnetic field that modifies the main magnetic field and a secondary conductor arrangement () for shielding the primary magnetic field.264. The arrangement as claimed in claim 1 , wherein the primary conductor arrangements () are supplied with current independently of one another or are supplied with current independently of one another in pairs claim 1 , or the conductor arrangements () are respectively connected separately from one another to at least one of a current source or to a current supply claim 1 , or both.31337337. The arrangement () as claimed in claim 1 , wherein the carrier elements ( claim 1 , ) are connected or are connectable mechanically to neighboring carrier elements ( claim 1 , ).41337. The arrangement () as claimed in claim 3 , wherein the carrier elements ( claim 3 , ) are connected or are connectable at least one of releasably claim 3 , in an interlocking claim 3 , frictionally engaging claim 3 , or material-bonding manner.51337838337. The arrangement () as ...

Arrangement and Method for Reducing a Magnetic Unidirectional Flux Component in the Core of a Transformer

An arrangement for reducing a magnetic unidirectional flux component in the core of a transformer includes a measurement apparatus which provides a measurement signal corresponding to the magnetic unidirectional flux component, a compensation winding magnetically coupled to the core of the transformer, wherein magnetic flux flowing in the core induces a voltage in the compensation winding, a switch device arranged electrically in series together with the compensation winding in a current path, a control device which controls the switch device via a control parameter, where the switch unit comprises a magnetic core and a winding arrangement which is magnetically coupled to the magnetic core, and the control parameter is supplied to the winding arrangement such that the magnetic saturation state of the core is variable, whereby the conductive state of the switch unit can be produced. 112.-. (canceled)13. An arrangement for reducing a magnetic unidirectional flux component in the core of a transformer , comprising:a measurement apparatus which provides a measurement signal corresponding to the magnetic unidirectional flux component;a compensation winding magnetically coupled to the core of the transformer, the magnetic flux flowing in the core inducing a voltage in the compensation winding;a switch device arranged electrically in series with the compensation winding in a current path;a control device which controls the switch device via a control parameter such that the switch device is switchable to a conductive state at an activation time which is dependent on the measurement signal and is network-synchronous, whereby a compensation current is injected into the compensation winding, an effect of which is directed against the unidirectional flux component;wherein the switch device comprises a magnetic core and a winding arrangement which is magnetically coupled to this core;wherein the control parameter is supplied to the winding arrangement such that a magnetic ...

Device for compensating external magnetic stray fields or for compensating the influence of a magnetic field gradient on a magnetic field sensor

Vorrichtung zum Kompensieren eines Einflusses eines Magnetfeldgradienten, welcher durch eine Bauteilgeometrie wenigstens einer ersten Komponente (1) erzeugbar ist auf einen Magnetfeldsensor (17, 18). Die Vorrichtung umfasst mindestens zwei Magnetfeldsensoren (17, 18), die außerhalb des magnetischen Gleichgewichts einer weiteren ferromagnetischen Komponente (1) angeordnet sind. Die Vorrichtung umfasst weiter mindestens zwei Magnetfeldsensoren (17, 18), die jeweils eine voneinander abweichende Sensitivität aufweisen. Derjenige Magnetfeldsensor (17, 18), welcher, bedingt durch seine räumliche Anordnung relativ zur weiteren ferromagnetischen Komponente (1), im Vergleich zum anderen Magnetfeldsensor (17, 18) in einem höheren Maße dem Einfluss des Magnetfeldgradienten ausgesetzt ist, eine Sensitivität aufweist, die von der Sensitivität des anderen Sensors abweicht. Device for compensating an influence of a magnetic field gradient which can be generated by a component geometry of at least one first component (1) on a magnetic field sensor (17, 18). The device comprises at least two magnetic field sensors (17, 18), which are arranged outside the magnetic balance of a further ferromagnetic component (1). The device further comprises at least two magnetic field sensors (17, 18) each having a different sensitivity. The one magnetic field sensor (17, 18), which, due to its spatial arrangement relative to the further ferromagnetic component (1) compared to the other magnetic field sensor (17, 18) is exposed to a greater extent the influence of the magnetic field gradient, has a sensitivity that deviates from the sensitivity of the other sensor.

Corrective magnetic field for ferrite-based circuits

A demagnetizing device includes, in one embodiment, a demagnetizer. The demagnetizer is operable to generate a corrective magnetic field. The corrective magnetic field is operable to act upon a ferrite-based core to maintain suitable performance of a network-connected device which includes such core. The network-connected device is electrically connected to a coaxial cable, and the coaxial cable is electrically connected to a data network. The first circuit portion is configured to receive a first parallel part of a transient signal transmission.

一种力敏传感单元磁致链化实时成链控制装置和方法

本发明提出一种力敏传感单元磁致链化实时成链控制装置和方法，包括：粘度检测模块，用于通过旋转阻力矩检测待测液体的粘度；磁场发生模块，用于为待测液体提供外加磁场；主控模块，用于构建待测液体中磁性颗粒的动态磁致力学模型，并根据粘度检测数据结合所述动态磁致力学模型，调节磁场发生模块输出磁场强度，控制所述待测液体中磁性颗粒磁致成链；本发明可提高磁致成链的控制精度以及成链效果。

Method and device for compensation in a measurement of a magnetic field, object-localizing method and system, recording medium for these methods

This method of compensation in the measurement of a magnetic field comprises: the determining of a position and of a magnetic moment of an image of the source situated on the other side of the magnetic disturber using one or more measurements of the emitted magnetic field, performed by at least one magnetic sensor whose position and orientation relatively to the source are known, and the subtraction of the magnetic field emitted by this image from the measurement of the magnetic field made by the sensor in the presence of the magnetic disturber to obtain compensation in this measurement.

Dynamic magnetic anomaly compensation

An array of three-axis magnetometers used for dynamic magnetic anomaly compensation are located at the corners of a parallelopiped, with pairs of magnetometer outputs used to derive a magnetic anomaly gradient vector used to compensate a compass and/or the output of a gyroscope in an inertial management unit. The system may be used in a neutrally buoyant remotely operated vehicle to permit ascertaining of course and position in the absence of surface control signals.

Electromagnetic survey systems and methods with rotation-corrected motion compensation

A disclosed electromagnetic survey system includes one or more streamer(s) having multiple electromagnetic sensors and motion sensing units. Each motion sensing unit has one or more accelerometer(s) to measure motion perpendicular to an axis of the streamer, and a rotation sensor to measure rotation about the axis. The measurements of the accelerometer are adjusted based on measurements from the rotation sensor. The survey system also includes one or more processor(s) that determine, for each electromagnetic sensor, a motion signal based on the adjusted measurements. A described electromagnetic survey method includes processing acceleration and rotational motion measurements to obtain an orientation of motion sensing units as a function of time. The measured acceleration is manipulated based on the orientation to obtain one or more velocity signal(s) for each motion sensing unit. Interpolation is performed on the velocity signals to determine at least one velocity signal for each electromagnetic sensor.

Dynamic magnetic anomaly compensation

An array of three-axis magnetometers used for dynamic magnetic anomaly compensation are located at the corners of a parallelopiped, with pairs of magnetometer outputs used to derive a magnetic anomaly gradient vector used to compensate a compass and/or the output of a gyroscope in an inertial management unit. The system may be used in a neutrally buoyant remotely operated vehicle to permit ascertaining of course and position in the absence of surface control signals.

Electromagnetic survey systems and methods with rotation-corrected motion compensation

A disclosed electromagnetic survey system includes one or more streamer(s) having multiple electromagnetic sensors and motion sensing units. Each motion sensing unit has one or more accelerometer(s) to measure motion perpendicular to an axis of the streamer, and a rotation sensor to measure rotation about the axis. The measurements of the accelerometer are adjusted based on measurements from the rotation sensor. The survey system also includes one or more processor(s) that determine, for each electromagnetic sensor, a motion signal based on the adjusted measurements. A described electromagnetic survey method includes processing acceleration and rotational motion measurements to obtain an orientation of motion sensing units as a function of time. The measured acceleration is manipulated based on the orientation to obtain one or more velocity signal(s) for each motion sensing unit. Interpolation is performed on the velocity signals to determine at least one velocity signal for each electromagnetic sensor.

Device and method for generating and controlling a magnetic field strength

Die vorliegende Erfindung betrifft eine Vorrichtung (50) zur Erzeugung und Regelung einer magnetischen Feldstärke und ein Verfahren zur Erzeugung und Regelung einer magnetischen Feldstärke, wobei die Erzeugung sehr stabil und präzise erfolgt. Bevorzugt können Referenzwerte physikalischer Größe relativ einfach und kostengünstig erzeugt werden. Außerdem können magnetische Flussdichten mit hoher Auflösung und insbesondere sehr robust vermessen werden. Die Erfindung kann auch zur Informationsübertragung, insbesondere zur Ultrawideband-Kommunikation, verwendet werden. Die notwendigen Vorrichtungen (50) können dabei sehr klein, insbesondere miniaturisiert, und mobil benutzbar ausgebildet werden. The present invention relates to a device (50) for generating and regulating a magnetic field strength and a method for generating and regulating a magnetic field strength, the generation taking place very stably and precisely. Reference values of physical size can preferably be generated relatively easily and inexpensively. In addition, magnetic flux densities can be measured with high resolution and in particular very robustly. The invention can also be used for information transmission, in particular for ultra-wideband communication. The necessary devices (50) can be made very small, in particular miniaturized, and usable for mobile use.

Power supply for a gradient coil of a nuclear magnetic resonance imaging system

MAGNETIC SENSOR

To provide a small-sized magnetic sensor capable of achieving closed-loop control. A magnetic sensor includes: a sensor chip mounted on a surface of a substrate such that an element formation surface is perpendicular to the surface of the substrate or inclined by a predetermined angle with respect thereto; an external magnetic member mounted on the surface of the substrate and collecting a magnetic field to be detected in a magnetosensitive element; and a compensating coil wound around the external magnetic member. The compensating coil is thus wound around the external magnetic member, so that it is possible to cancel a magnetic field to be applied to the magnetosensitive element and to prevent the external magnetic member from being magnetically saturated. 1. A magnetic sensor comprising:a substrate;a sensor chip provided with an element formation surface having at least one magnetosensitive element formed thereon, the sensor chip being mounted on a surface of the substrate such that the element formation surface is perpendicular to the surface of the substrate or inclined by a predetermined angle with respect to the surface of the substrate;at least one external magnetic member mounted on the surface of the substrate and collecting a magnetic field to be detected in the magnetosensitive element; anda compensating coil wound around the external magnetic member.2. The magnetic sensor as claimed in claim 1 , wherein the compensating coil is wound around the external magnetic member at a position not overlapping the substrate.3. The magnetic sensor as claimed in claim 2 ,wherein the external magnetic member has a protruding part protruding from the surface of the substrate, andwherein the compensating coil is wound around the protruding part.4. The magnetic sensor as claimed in claim 2 ,wherein the substrate has a slit or an opening overlapping the external magnetic member, andwherein the compensating coil is disposed at a position overlapping the slit or opening.5. ...

트랜스포머의 코어 내의 자기 단방향성 플럭스 프랙션을 감소시키기 위한 디바이스 및 방법

본 발명은 트랜스포머의 코어 내의 자기 단방향성 플럭스 프랙션을 감소시키기 위한 디바이스에 관한 것으로, 상기 디바이스는, - 상기 자기 단방향성 플럭스 프랙션에 대응하는 센서 신호(6)를 제공하는 측정 디바이스(7), - 상기 트랜스포머의 코어(4)에 자기적으로 결합되는 보상 권선(K), - 전류를 상기 보상 권선(K) 내에 공급하기 위해 상기 보상 권선(K)과 직렬로 전류 경로(3) 내에 전기적으로 배열된 스위칭 유닛(T)을 포함하며, 상기 전류의 작용은 상기 단방향성 플럭스 프랙션과 반대로 지향된다. 어레인지먼트는, 상기 스위칭 유닛(T)이 제어 디바이스(2)에 의해 제공되는 조절 변수(9)에 의해 제어될 수 있고, 상기 스위칭 유닛(T)은 미리규정된 시간 구간(16) 동안, 그리고 상기 조절 변수(9)에 따라 전도 상태로 스위칭될 수 있고, 스위치-온 시간(14)은 메인즈-동기적인 것을 특징으로 한다. 상기 전류 경로(3) 내의 전류를 제한하기 위한 디바이스가 제공되고, 상기 센서 신호(6)는 상기 제어 디바이스(2)에 공급된다.

Using resin age factor to obtain measurements of improved accuracy of one or more polymer properties with an on-line nmr system

A real-time, on-line nuclear magnetic resonance (NMR) system, and related method, can predict various properties of interest of a sample of polymer material. A regression or neural network technique is used to develop a model based upon manipulated NMR output and a resin age factor which compensates for time dependent aging phenomena and enhances predictive accuracy of the model. In a preferred embodiment, the resin age factor is a function of elapsed cycle time prior to sample measurement, sample temperature at time of measurement, and/or sample form. The polymer can be a plastic such as polyethylene, polypropylene, or polystyrene, or a rubber such as ethylene and propylene rubber.

Using neural network and partial least square regression techniques in obtaining measurements of one or more polymer properties with an on-line nmr system

An on-line nuclear magnetic resonance (NMR) system, and related methods, are useful for predicting one or more properties of interest of a polymer. In one embodiment, a neural network is used to develop a model which correlates process variables in addition to manipulated NMR output to predict a polymer property of interest. In another embodiment, a partial least square regression technique is used to develop a model of enhanced accuracy. Either the neural network technique or the partial least square regression technique may be used in conjunction with a described multi-model or best-model-selection scheme according to the invention. The polymer can be a plastic such as polyethylene, polypropylene, or polystyrene, or a rubber such as ethylene propylene rubber.

Magnetic resonance imaging system having probes for field investigation

FIELD: physics. SUBSTANCE: using: for magnetic resonance imaging. Essence of the invention consists in the fact that the system of magnetic-resonance investigations contains system of probes for investigation of the field for measurement of magnetic field distribution from the main magnetic field and from the gradient magnetic field. Measurements are performed in earlier configuration and resultant magnetic field caused by gradient switching or external causes. Response relationship is output from the measured resultant magnetic field and stored in memory. Response relationship from memory is available to compensate for activation of gradient fields or correction during reconstruction for response ratio during reconstruction. This compensation or correction can be performed in current configuration. EFFECT: technical result is providing a system of probes for field investigation, which is less dependent on space available for placement of probes for field investigation. 9 cl, 1 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 716 870 C2 (51) МПК G01R 33/389 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК G01R 33/389 (2020.01) (21)(22) Заявка: 2017143138, 09.05.2016 (24) Дата начала отсчета срока действия патента: (73) Патентообладатель(и): КОНИНКЛЕЙКЕ ФИЛИПС Н.В. (NL) Дата регистрации: 17.03.2020 12.05.2015 EP 15167251.6 (43) Дата публикации заявки: 13.06.2019 Бюл. № 17 (56) Список документов, цитированных в отчете о поиске: RU 2491567 C2, 27.08.2013. RU 2411528 C2, 10.02.2011. RU 2435170 C2, 27.11.2011. WO 2013105006 A1, 18.07.2013. WO 2011145029 A1, 24.11.2011. (45) Опубликовано: 17.03.2020 Бюл. № 8 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 12.12.2017 2 7 1 6 8 7 0 Приоритет(ы): (30) Конвенционный приоритет: R U 09.05.2016 (72) Автор(ы): ГРОСС, Патрик (NL), ФЮДЕРЕР, Миха (NL) EP 2016/060348 (09.05.2016) C 2 C 2 (86) Заявка PCT: (87) Публикация заявки PCT: R U 2 7 1 6 8 7 0 WO 2016/180786 ...

Magnetic-field uniformity correcting device

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Magnetic resonance apparatus

A magnetic resonance apparatus uses a first harmonic signal produced by magnetic field modulation as a correction signal and the second harmonic signal to provide a property of a sample.

For the magnetic field for correcting based on ferritic circuit

在一个实施例中，一种消磁设备包括消磁器。消磁器可操作用于产生校正磁场。该校正磁场可操作用于对基于铁氧体的芯起作用以保持包括这样的芯的网络连接设备的适当性能。该网络连接设备被电连接到同轴电缆，并且该同轴电缆被电连接到数据网络。第一电路部分被配置成接收暂态信号传输的第一并行部分。

Magnetic field locking device and method for eliminating transient environment interference

本发明涉及一种消除瞬态环境干扰的磁场锁定装置及方法，装置包括：设置在主磁体附近的磁场传感器，用于采集环境磁场，所述环境磁场包括瞬态磁场信号；模数转换器，用于将所述环境磁场转换为数字信号；处理器，用于基于所述数字信号计算磁场补偿量；补偿装置，用于根据所述磁场补偿量产生补偿电信号，并根据所述补偿电信号抵消所述环境磁场中的干扰。本发明能够实时精确地补偿由环境干扰造成的磁场波动，解决低频环境干扰造成的瞬态磁场波动产生的问题。

Device and method for controlling rotating magnetic field by using capacitor charging and discharging time sequence

本发明涉及一种利用电容充放电时序控制旋转磁场的装置及方法，所述装置包括：多组线圈、多个高压直流电源、多个高压电容、多组开关切换电路、微控制器；每组线圈连接一个可控高压直流电源、以及两个高压电容，每组线圈连接的所述高压直流电源用于对所述两个高压电容进行充电；微控制器通过控制开关切换电路来实现多组中高压电容的充电、高压电容对线圈的放电时序，从而控制多组线圈中产生旋转磁场；所述两个高压电容对所述每组线圈依次轮流放电，即其中一个电容在放电时，另一个在进行充电，循环切换，多组线圈电路轮流执行该过程。

Method and apparatus for measuring electromagnetic field strength, method for measuring electromagnetic field strength distribution, and apparatus and method for measuring current / voltage distribution

空間に形成された電磁界の電界成分と磁界成分のそれぞれを小型且つ簡易な設備で容易且つ正確に測定することができる電磁界強度の測定方法を提供する。測定用プローブ２０の両端からの出力電流Ｏ１及びＯ２を基準信号用プローブ３０の出力電流Ｒと同時に測定することにより、各出力電流Ｏ１及びＯ２の大きさ及び各出力電流Ｏ１及びＯ２の出力電流Ｒとの位相差を測定し、これらに基づき測定用プローブ２０に対して電界により生じる電界成分電流と磁界により生じる磁界成分電流を算出し、これらに基づき電界強度及び磁界強度を求める。 Provided is a method for measuring an electromagnetic field intensity, which can easily and accurately measure each of an electric field component and a magnetic field component of an electromagnetic field formed in a space with small and simple equipment. By measuring the output currents O1 and O2 from both ends of the measurement probe 20 at the same time as the output current R of the reference signal probe 30, the magnitude of each output current O1 and O2 and the output current R of each output current O1 and O2 are measured. Is measured, and based on these, the electric field component current generated by the electric field and the magnetic field component current generated by the magnetic field with respect to the measurement probe 20 are calculated, and the electric field strength and the magnetic field strength are obtained based on these.

Method for creating a stable magnetic field and system for implementation thereof

FIELD: magnets. SUBSTANCE: invention relates to a metrological electromagnetic complex and is intended for creating a compensating magnetic field. A method for stabilising a magnetic field in the gap of an electric magnet, including setting the target value of magnetic induction in the gap of the electric magnet by control means, supplying the current of a calculated strength by the main power source to the primary magnetic field creating means, measuring the value of magnetic induction in the gap of an electric magnet to determine the difference between the set and actual values of magnetic induction, determining the addition to the strength of the current supplied to the main magnetic field creating means, conducting several iterations in a predetermined sequence to reach an experimentally determined difference between the target and actual values of magnetic induction, connecting the compensating magnetic field creating means connected with an own smaller power supply thereof, measuring the value of the magnetic field in the gap, followed by adjusting the value of the current strength and introducing no less than one correction coefficient into the value of the current strength. EFFECT: technical result consists in stabilising the magnetic field in the gap of the electric magnet. 10 cl, 1 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 756 776 C1 (51) МПК G05F 7/00 (2006.01) G01R 33/38 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК G05F 7/00 (2021.05); G01R 33/38 (2021.05) (21)(22) Заявка: 2020113449, 14.04.2020 (24) Дата начала отсчета срока действия патента: Дата регистрации: 05.10.2021 Адрес для переписки: 620014, г. Екатеринбург, ул. Бориса Ельцина, 3/2, ДД "Демидов", 31 эт., оф. 3101, Уральская ТПП (56) Список документов, цитированных в отчете о поиске: SU 1721599 A1, 23.03.1992. SU 964614 A1, 07.10.1982. JP 2009180677 A, 13.08.2009. JP 4118844 B2, 16.07.2008. RU 152855 U1, 20.06.2015. Стр.: 1 C 1 2 7 ...

Circuit arrangement of a flux stabilizer for keeping the magnetic field constant

Operation control device for internal combustion engine

Device and method for controlling rotating magnetic field by using capacitor charging and discharging time sequence

本发明涉及一种利用电容充放电时序控制旋转磁场的装置及方法，所述装置包括：多组线圈、多个高压直流电源、多个高压电容、多组开关切换电路、微控制器；每组线圈连接一个可控高压直流电源、以及两个高压电容，每组线圈连接的所述高压直流电源用于对所述两个高压电容进行充电；微控制器通过控制开关切换电路来实现多组中高压电容的充电、高压电容对线圈的放电时序，从而控制多组线圈中产生旋转磁场；所述两个高压电容对所述每组线圈依次轮流放电，即其中一个电容在放电时，另一个在进行充电，循环切换，多组线圈电路轮流执行该过程。

Apparatus for controlling magnetic field intensity

Изобретение относится к магнитооптическим системам хранения информации, в частности к регулированию подмагничивания обмоткой подмагничивания в магнитооптических системах хранения информации. Технический результат - обеспечение однородности магнитного поля и снижение мощности, рассеиваемой в системе. Для этого устройство для регулирования напряженности магнитного поля содержит первый контроллер, второй контроллер, цифроаналоговый преобразователь, формирователь тока и обмотку подмагничивания. Первый контроллер определяет положение фокальной точки объектива и передает его на второй контроллер, который вырабатывает цифровой сигнал, связанный с данным положением. Цифроаналоговый преобразователь преобразует цифровой сигнал в напряжение возбуждения и передает это напряжение на формирователь тока, который подает на обмотку подмагничивания ток подмагничивания, связанный с напряжением возбуждения. Обмотка подмагничивания создает магнитное поле, напряженность которого связана с током подмагничивания. Второй контроллер учитывает магнитные поля рассеяния при формировании цифрового сигнала. Магнитные поля рассеяния могут иметь постоянную или переменную напряженность в зависимости от положения объектива, окружной или линейной скорости носителя информации. Устройство может дополнительно содержать датчик тока для измерения тока подмагничивания и устройство обратной связи для подачи на формирователь тока напряжения обратной связи, связанного с током подмагничивания. 4 с.п. ф-лы, 12 ил. сс с ПЧ сэ РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) (51) МПК? ВИ” 2182 7214 ^^ ©С2 С ОЕ 7/00 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 96106047/09, 29.03.1996 (24) Дата начала действия патента: 29.03.1996 (30) Приоритет: 07.04.1995 Ц$ 08/418,965 (43) Дата публикации заявки: 20.06.1998 (46) Дата публикации: 20.05.2002 (56) Ссылки: ЗИ 1020810 А, 30.05.1983. 4$ 3673465 А, 27.06.1972. $Ц 1599810 АЛ, 07.06.1990. СВ 1315777, 02.05.1973. ОЕ 2106051, 01.02.1973. ...

Patent FR2112288A1

METHOD AND DEVICE FOR COMPENSATING A MEASUREMENT OF A MAGNETIC FIELD, METHOD AND SYSTEM FOR LOCATING AN OBJECT, RECORDING MEDIUM FOR THESE METHODS

Cancelling circuit for direct current magnetic field

Device for detecting a magnetic field

METHOD AND DEVICE FOR COMPENSATING A MEASUREMENT OF A MAGNETIC FIELD, METHOD AND SYSTEM FOR LOCATING AN OBJECT, RECORDING MEDIUM FOR THESE METHODS

Ce procédé de compensation d'une mesure d'un champ magnétique comporte : - la détermination (64) d'une position et d'un moment magnétique d'une image de la source située de l'autre côté d'un perturbateur magnétique à partir d'une ou plusieurs mesures d'un champ magnétique émis réalisées par au moins un capteur magnétique dont la position et l'orientation par rapport à la source de ce champ magnétique sont connues, et - la soustraction (74) du champ magnétique émis par cette image à la mesure du champ magnétique réalisée par un capteur en présence du perturbateur magnétique pour compenser cette mesure. This method of compensating a measurement of a magnetic field comprises: determining (64) a position and a magnetic moment of an image of the source located on the other side of a magnetic disturbance device; from one or more measurements of an emitted magnetic field produced by at least one magnetic sensor whose position and orientation with respect to the source of this magnetic field are known, and - the subtraction (74) of the emitted magnetic field by this image to the measurement of the magnetic field produced by a sensor in the presence of the magnetic disturbance to compensate for this measurement.

Electron spin resonance spectrometers

Electron spin resonance spectrometers comprise a sample cavity located between the poles of a permanent magnet, means for applying microwave energy to the cavity, means for measuring the frequency of the microwave energy applied to the cavity, means for controlling the magnetic field strength in the cavity, means for detecting changes in cavity Q and accordingly changes in the level of microwave power reflected back from the cavity, and means for analysing the changes in reflected power. In accordance with one aspect, a nuclear magnetic resonance probe including a standard sample is placed adjacent the sample cavity, means are provided for measuring the nuclear magnetic resonance frequency in the standard sample, calculating the magnetic field to which the sample and the adjacent cavity are subjected therefrom and applying the results of the calculation to control the magnetic field strength in the cavity. In another aspect the spectrometer includes control means for controlling the operation of the spectrometer by stabilising the precisely defined relationship between magnetic field strength and microwave frequency at resonance in accordance with a fixed or swept demand g-value relating to the test sample.

Nmr analysis of polypropylene in real time

Pulsed NMR system for industrial measurements comprising sample throughput system (P, LI, V1, V2) and user system controls (104) to establish digitized free induction decay (FID) curves (C), from which fast Gaussian, slower modified Gaussian or preferably slower Gaussian, and exponential components are determined using a Marquardt-Levenberg iteration technique, and using regression techniques to correlate the FID curve components to the physical quantities of the target nuclei.

Metal detector for production and packaging lines

A metal detector ( 20 ) has a metallic enclosure ( 21 ) with entrance and exit apertures ( 30, 31 ). A coil system inside the enclosure has an energized transmitter coil. First and second receiver coils ( 24, 25 ) bound a detection zone ( 28 ) between the apertures, through which inspected objects ( 2 ) travel. The receiver coils are on opposite sides of the transmitter coil, with regard to the direction of travel ( 13 ). The receiver coils are connected in series, but their windings are wires oppositely in a rotational sense. Metal contamination in the object generates a detection signal in the receiver coils. A first and second flange ( 26 ), arranged at the entrance and exit, cancel the undesirable influence of metal contamination beyond a first distance upstream of and a second distance downstream of the coil system. The respective flanges differ from each other and, consequently, the first and second distances are different.

Method and apparatus for controlling bias levels in a magneto-optical recording device

PURPOSE: A method and an apparatus for controlling bias levels in a magneto-optical recording device are provided to control a magnetic field strength at a focus of a lens. CONSTITUTION: The first controller(14) determines a focal position of a lens and transmits the determined position to the second controller(15). The second controller(15) provides a digital signal for the position. A digital/analog converter(16) converts the digital signal into a driver voltage, and transmits the driver voltage to a current driver(17). The current driver(17) provides a bias current for the driver voltage to a bias coil(18). The bias coils(18) generates a magnetic field having the strength corresponding to the bias current.

Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformer

The invention relates to a device for reducing a magnetic unidirectional flux fraction in the core of a transformer, comprising: - a measurement device (7) that provides a sensor signal (6) corresponding to the magnetic unidirectional flux fraction, - a compensation winding (K) that is magnetically coupled to the core (4) of the transformer, - a switching unit (T) arranged electrically in a current path (3) in series with the compensation winding (K) in order to feed a current into the compensation winding (K), wherein the action of said current is directed opposite to the unidirectional flux fraction. The arrangement is characterized in that the switching unit (T) can be controlled by means of a regulating variable (9) provided by a control device (2), wherein the switching unit (T) can be switched into a conductive state during a predefined time interval (16) and in accordance with the regulating variable (9), the switch-on time (14) being mains-synchronous. A device for limiting the current in the current path (3) is provided and the sensor signal (6) is fed to the control device (2).

Control device for field generated by superconductor winding - uses quantum interferometer sensing flux changes for correction circuits

A superconducting coil generates a magnetic field parallel to the axis of a coil in a superconducting flux transformer. The ring of a quantum interferometer is mounted parallel to the transformer winding which is in a screened cylindrical superconductor to prevent the interferometer from being sensitive to magnetic fields from correction windings. The interferometer ring is subjected to a radio frequency magnetic field generated by a coil in parallel with a capacitor connected through a matching circuit to a power source where signals are processed to generate correction coil signals.

Circuit for the compensation of the horizontal component of the earth's magnetic field for a colour picture tube of a high-resolution monitor

Systems and methods for magnetic shielding

Systems and methods for magnetic shielding are described. A magnetic shield formed of a material having a high magnetic permeability may be degaussed using a toroidal degaussing coil. The toroidal degaussing coil may enclose at least a portion of the shield. Magnetic field gradients may be actively compensated using multiple magnetic field sensors and local compensation coils. Trapped fluxons may be removed by an application of Lorentz force wherein an electrical current is passed through a superconducting plane.

Motion-state dependent operation of kinetic generator in offshore environment

A motion-state dependent method for operating a kinetic generator in an offshore environment includes determining a motion state of the offshore environment, and imposing a limit on at least one of charging and discharging of the kinetic generator based upon the motion state to keep the kinetic generator within a safe operating range.

Device for preventing reverse flow in a magnetizable element

Measurement of magnetic fields.

A method of monitoring a magnetic field drift of a magnetic resonance imaging apparatus

The invention enables to monitor a magnetic field drift of a magnetic resonance imaging apparatus on the basis of the magnetic resonance signals, which are acquired during magnetic resonance image data acquisition, such as by single shot EPI or by a gradient echo sequence. The phases of at least two magnetic resonance signals are acquired an echo time after the corresponding RF excitations. This corresponds to the central k-space line, which has frequency encoding but no phase encoding. The difference of two consecutive phase measurements, which are acquired at a certain time interval provides the shift of the resonance frequency. This enables monitoring of the shift of the resonance frequency and compensation of the magnetic field drift.

Magnet systems

In a magnet system, e.g. for use in a magnetic resonance apparatus, wherein a magnetic field is produced in a gap between pole pieces (5) joined by a yoke (7) by an electric drive coil arrangement carried on the yoke, stabilisation against variations in the field in the gap is provided by a stabilising arrangement (43) wherein over a section of its length the yoke is divided into a plurality of discrete parallel finger-like portions (45) each of which is surrounded by a separate ring (47) of superconducting non-magnetic material.

Magnetic resonance device with stray magnetic field compensation

The magnetic resonance device (2) includes a magnetic field sensor (12) which detects stray magnetic fields. A signal processor (14) connected to the magnetic field sensor generates a compensation signal from the measurement signals. A coil arrangement (16) connected to the signal processor generates a compensation magnetic field from the compensation signal so that the influence of the stray magnetic field on the investigation volume (8) is minimised.

Disturbance Elimination System for Inductive Sensors

The invention relates to a disturbance elimination system for inductive sensors for monitoring the movement of mobile objects, including an inductive element formed by two magnetically-opposed identical half-coils (L 2 and L 3 ) which are arranged in parallel with one another and coplanar to the movement plane of a magnetic element ( 1 ) provided on the mobile element a to be monitored, facing a point through which the moving magnetic element ( 1 ) passes.

Magnetic flux locking apparatus

Output currents from a superconducting quantum interference device (2) which corresponds to magnetic flux guided thereto are compared with a predetermined value which corresponds to a magnetic flux locking point so as to detect a direction of shift with respect to the magnetic flux locking point. A shift quantity is judged to determine whether or not it is large based upon a history of the shift direction. A variation value component of an estimate feedback quantity is varied by taking this history into consideration. The estimate feedback quantity is used to guide magnetic flux for compensating for variation in the magnetic flux which is guided to the superconducting quantum interference device (2).

Linear selsyn

FIELD: electrical engineering.SUBSTANCE: invention relates to electrical engineering, in particular to micromachines such as selsyns. According to the invention, in the linear selsyn the exciting and three-phase synchronizing windings are located along the surface of the frame, made in the form of a cylinder segment, partially covering the toothed magnetic core. Both of these windings are made in printed form in the form of flat inductors, the conductors of which are made in the form of a meander and bifilar. In this case, the steps of the three-phase synchronizing windings and the steps of the toothed magnetic core are shifted relative to each other in accordance with a certain ratio.EFFECT: improving the accuracy of synchronous transmission of translational motion of the controlled object, with obtaining high-precision output control signal in a wider range of linear movements of the controlled object.4 cl, 3 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 678 724 C1 (51) МПК G08C 19/48 (2006.01) H02K 24/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК G08C 19/48 (2006.01); G05F 7/00 (2006.01); G01R 33/28 (2006.01) (21)(22) Заявка: 2017143521, 12.12.2017 (24) Дата начала отсчета срока действия патента: (73) Патентообладатель(и): Общество с ограниченной ответственностью "Станкомодерн" (RU) Дата регистрации: 31.01.2019 (56) Список документов, цитированных в отчете о поиске: SU 304562 A1, 25.05.1971. SU 597050 (45) Опубликовано: 31.01.2019 Бюл. № 4 2 6 7 8 7 2 4 R U (54) Линейный сельсин (57) Реферат: Изобретение относится к электротехнике, в частности к микромашинам типа сельсинов. Технический результат - повышение точности синхронной передачи поступательного движения контролируемого объекта, с получением высокоточного выходного управляющего сигнала в более широком диапазоне линейных перемещений контролируемого объекта. Согласно изобретению, в линейном сельсине возбуждающая и трехфазные синхронизирующие ...

System for active compensation of magnetic field disturbances in magnetic resonance tomography

Device and method for generating and controlling a magnetic field strength

Die vorliegende Erfindung betrifft eine Vorrichtung (50) zur Erzeugung und Regelung einer magnetischen Feldstärke und ein Verfahren zur Erzeugung und Regelung einer magnetischen Feldstärke, wobei die Erzeugung sehr stabil und präzise erfolgt. Bevorzugt können Referenzwerte physikalischer Größe relativ einfach und kostengünstig erzeugt werden. Außerdem können magnetische Flussdichten mit hoher Auflösung und insbesondere sehr robust vermessen werden. Die Erfindung kann auch zur Informationsübertragung, insbesondere zur Ultrawideband-Kommunikation, verwendet werden. Die notwendigen Vorrichtungen (50) können dabei sehr klein, insbesondere miniaturisiert, und mobil benutzbar ausgebildet werden.

Device for extremely precise synchronisation of NMR transmission frequency to the resonance frequency of an NMR line taking into consideration a non-constant HF phase

A device for highly precise synchronization of an NMR transmission frequency to a resonance frequency of an NMR line, comprises an radio frequency (RF) generator (29) having a frequency (f r f); an NMR transmission (20) and reception system (21), where the NMR transmission and reception system using an RF signal from the generator to produce a train of excitation pulses; a first control loop (28), where the first control loop synchronizing the frequency (f r f) of the RF; and a second control loop (27), where the second control loop having a phase shifter that rotates a radio-frequency. A device for highly precise synchronization of an NMR transmission frequency to a resonance frequency of an NMR line while taking into consideration a non-constant radio frequency (RF) phase, comprises an RF generator (29) having a frequency (f r f); an NMR transmission (20) and reception system (21), where the NMR transmission and reception system using an RF signal from the generator to produce a train of excitation pulses having a repetition frequency (f m) with which nuclear spins of a certain resonance frequency of an associated NMR line are excited quasi-continuously, where, in times between the excitation pulses, an NMR signal is received, a period time 1/f mis chosen to be much smaller than a relaxation time of the NMR line or to be shorter than 1/10 of the relaxation time; a first control loop (28), where the first control loop synchronizing the frequency (f r f) of the RF generator with a resonance frequency (f 0) of the NMR line, where the first control loop utilizes an NMR signal (U d) mixed down into a low-frequency range to closed-loop-control and frequency lock a value of transmission frequency or to field lock a value of the B 0field in such a way that a frequency and phase of the RF generator and the NMR line are matched; and a second control loop (27), where the second control loop having a phase shifter that rotates a radio-frequency phase of the NMR transmission ...

Method and apparatus for controlling bias levels in a magneto-optical recording device

An apparatus for controlling the strength of a magnetic field, comprises a first controller (14), a second controller (15), a digital-to-analog converter (16), a current driver (17), and a bias coil (18). The first controller (14) determines the position of the focal point of a lens (29) and passes it to the second controller (15), which provides a digital signal related to the position. The digital-to-analog converter (16) converts the digital signal to a driver voltage and passes the driver voltage to a current driver (17), which provides to the bias coil (18) a bias current related to the driver voltage. The bias coil (18) produces a magnetic field having a strength related to the bias current. The second controller (15) accounts for stray magnetic fields in creating the digital signal. The stray magnetic fields may be constant or may vary in strength based on position of the objective lens (29), circumferential velocity of the storage medium (2, 4), or longitudinal velocity of the storage medium (2, 4). Furthermore, the apparatus may comprise a current sensor (26) for measuring the bias current, and a feedback device for providing to the current driver (17) a feedback voltage related to the bias current. <IMAGE>

Energy supply device for explosion-proof electronic functional units

本发明涉及一种用于多个防爆的电子功能单元的能量供应装置，在其中，功能单元由高频交流电压馈电，该高频交流电压对于每个功能单元而言单独通过一个扼流圈馈出。为了以少量费用为大量功能单元馈电，规定每个扼流圈(1)的多层印刷电路板(3)平行于其印制导线(2)层至少部分地被一个扁平的磁性材料板(5)覆盖。

Circuit for production of open alternating magnetic field - has two switching transistors each connected in series to parallel resonant circuits

An induction energy transfer device comprises a static power conversion circuit for producing an alternating magnetic field of ultrasonic frequency. The static power conversion circuit includes a parallel resonant circuit which comprises a coil which also couples power across an air gap. An improvement in efficiency and power transfer is obtained by including at least two such parallel resonant circuits in the power conversion circuit. One of the resonant circuits is tuned to the third harmonic of the fundamental frequency. The open magnetic field can serve for the inductive transmission of electrical energy from a circuit-containing primary apparatus over a distance to a matching equipped secondary apparatus.

METHOD FOR MEASURING THE INDUCED MAGNET IN A NAVAL VESSEL AND DEVICE FOR IMPLEMENTING THE SAME.

Magnetometer with compensation for the ambient magnetic field

The invention relates to a magnetometer comprising an orientable cell (1) for measuring a magnetic field. A device for measuring the ambient (terrestrial) magnetic field controls the orientation of the measurement cell (1) perpendicularly to the ambient magnetic field so that it is insensitive to this ambient magnetic field. Applications: measurement of magnetic fields of very low strengths.

Improvements to devices for controlling and measuring magnetic fields

Protective screening against radiation from earth magnetic field - uses electronically controlled magnetic coil with core e.g. on floor of building

The arrangement screens and absorbs earth radiation of e.m. d.c. fields emanating from buried water streams or hydraulic systems above the earth. A d.c. magnetic coil with a core as a magnetic counter pole is mounted with the magnetically attracting side directed against the direction of radiation. A magnetic field or radiation measuring sensor with an amplifier serves as a d.c. voltage regulator for the coil. The coil with core (10) and sensor are installed centrally in the magnetic field (12) emanating from the stream (11) from which the human beings, animals and/or plants are to be protected. The sensor can be a Hall generator. A measurer can be assigned to the amplifier for monitoring and/or adjusting. USE/ADVANTAGE - Health precaution. Can rid house of radiation. Can locate radiation field and measure its intensity. Can generate artificial earth radiation for biological research, i.e., investigating effect of radiation on animals and plants.

Systems and methods for magnetic shielding

Systems and methods for magnetic shielding are described. A magnetic shield formed of a material having a high magnetic permeability may be degaussed using a toroidal degaussing coil. The toroidal degaussing coil may enclose at least a portion of the shield. Magnetic field gradients may be actively compensated using multiple magnetic field sensors and local compensation coils. Trapped fluxons may be removed by an application of Lorentz force wherein an electrical current is passed through a superconducting plane.

Nuclear magnetic resonance imaging system

Electrostatic magnetic field generator for nmr ct apparatus

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Method for magnetic field tracking in a nmr check weighing system

A method (10) insures that the characteristics of the magnetic field used in a magnetic resonance check weighing system (20) for samples in vials (22) on a production line track deviations from the resonant frequency of the sample. The method (10) includes the steps of obtaining (50) a free induction decay signal from a magnetic resonance measurement of the sample, monitoring (52) from the free induction decay signal the deviation of the resonance frequency of the magnetic resonance measurement from a preselected resonance frequency; and adjusting (62) the magnetic field to maintain the preselected resonance frequency.

Method for compensating the magnetic earth field disturbance caused by ships

Gyromagnetic resonance spectrometer

Method and apparatus for controlling pre-magnetization levels

Stabilization of transverse magnetization in superconducting NMR resonators

A nuclear magnetic resonance (NMR) spectrometer with a magnet arrangement ( 1 ) for generating a homogeneous static magnetic field B 0 in the direction of a z axis and a radio frequency (RF) resonator ( 2 ) for receiving NMR signals from a measuring volume which has one or more superconducting components, is characterized in that a stabilization device is provided which keeps the magnetic field components B T , transverse to the homogeneous magnetic field B 0 , which acts on the superconducting components of the RF resonator ( 2 ), constant. The stabilization device can act actively or passively. It is thereby possible to completely suppress generation of disturbing transverse magnetization for RF resonator coils with superconducting components. Moreover, a demagnetised coil always remains demagnetised during the entire subsequent operation.

Patent DE3628161C2

Exciter control circuit for an electromagnet, in particular a lifting magnet, provided with a working air gap

Method for compensating for a magnetic field disturbance affecting a magnetic resonance device, and a magnetic resonance device

The invention relates to a method for compensating for a magnetic field disturbance affecting a magnetic resonance device, whereby the magnetic field disturbance is caused by a deflection of a component of the magnetic resonance device. To this end, the deflection or a variable causing the deflection is acquired in timed-dependent fashion, a mathematical field disturbance model is provided which models the effect the of the deflection on the magnetic field, and the acquired deflection or the variable causing the deflection is converted by means of the field disturbance model into a control variable for a compensation magnetic field generator or a high-frequency antenna. The compensation magnetic field generator controlled in this manner generates, for example, a compensation magnetic field which compensates for the magnetic field disturbance. The high-frequency antenna controlled in this manner is, for example, matched in its mid frequency to the magnetic field disturbance.

Metal detector

Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformer

A device for reducing a magnetic unidirectional flux fraction in the core of a transformer is provided. The device has a measuring device that provides a sensor signal corresponding to the magnetic unidirectional flux fraction, a compensation winding that is magnetically coupled to the core of the transformer, a switching unit arranged electrically in a current path in series with the compensation winding in order to feed a current into the compensation winding. The action of the current is directed opposite to the unidirectional flux fraction. The switching unit can be controlled by a regulating variable provided by a control device and can be switched into a conductive state during a predefined time interval and in accordance with the regulating variable, the switch-on time being mains-synchronous. A device for limiting the current in the current path is provided and the sensor signal is fed to the control device.

Measuring magnetic fields

Static electromagnetic converter

The invention relates to a static electromagnetic converter meant for power supply of various consumers. According to the invention, the converter consists of a permanent magnet (MP) which simultaneously is in a magnetic control circuit (CMC) and a main magnetic circuit (CMP) open due to an air gap, which forces the magnetic flux of the permanent magnet (MP) to close through the magnetic control circuit (CMC) when a control winding (IC) of said circuit is not supplied and, when control voltage (Uc) is supplied as impulses of variable amplitude and frequency, it leads to the saturation of said magnetic control circuit, the lines of the magnetic flux of the permanent magnet (MP) closing especially through the main magnetic circuit (CMP) on which there is the output winding (IE) wherein the output voltage (Ue) is induced, and a part of said voltage (Uec), rectified (R) and filtered (F), can actuate the control circuit (CC) supplying the control winding (IC) with the control voltage (Uc), where the external source (SE) may be disconnected.