Abstract: A motor controller configured to drive a permanent magnet synchronous motor (PMSM) with Field Oriented Control (FOC), includes a current controller configured to generate control signals for driving the PMSM. The current controller is configured to measure current information of the PMSM, including a direct-axis motor current and a quadrature-axis motor current. The current controller includes a direct-axis current regulator configured to receive a direct-axis reference current and the direct-axis motor current to generate a direct-axis error value based on a difference between the direct-axis reference current and the direct-axis motor current. The current controller includes a voltage regulator configured to regulate a DQ voltage vector comprising a direct-axis motor voltage and a quadrature-axis motor voltage, wherein the voltage regulator generates the direct-axis motor voltage based on the direct-axis error value and a voltage vector limiting function to drive the direct-axis motor current to zero.

Abstract: An apparatus includes a controller that controls operation of an amplifier. The amplifier receives a sample voltage produced by a resistive path; the sample voltage from the resistive path is indicative of a magnitude of current through a motor winding. The controller selects a gain setting to apply to the amplifier based on one or more conditions. The selected gain setting is selected amongst multiple possible gain settings. Subsequent to selection, via application of the selected gain setting to the amplifier, and based on an output of the amplifier, the controller monitors a magnitude of the current through the motor winding. According to one configuration, the amplifier adjusts the magnitude of the selected gain setting depending on one or more parameters such as the magnitude of the current through the motor winding, a selected operational range of controlling current through the motor winding, etc.

Abstract: A motor controller for controlling a drive of a motor having plural phase windings includes upper and lower arm circuits and a control unit. The control unit switchingly controls ON/OFF of switches of the upper and lower arm circuits, for sequentially switching an energized phase of the motor. Then, from among the plural switches, a switch forming an energization path to the energized phase is designated as an energized phase switch with the others of the plural switches being designated as non-energized phase switches. Further, from among the non-energized phase switches, a switch forming a path of a reflux current that accompanies the switching of the energized phase is designated as a reflux switch. Then, the control unit performs an ON control of the energized phase switch in addition to performing an ON control of the reflux switch.

Abstract: A servo motor controller is provided which enables an offset to be set more easily and accurately, in comparison to the conventional technique. A servo motor controller for controlling a servo motor of an industrial machine includes: a position detection unit that detects a position of the servo motor; a magnetic-pole detection unit that detects a magnetic-pole phase of the servo motor; and a phase calculation unit that determines a calculation-based phase based on position data of the servo motor and magnetic-pole gap information of the servo motor. The servo motor controller is configured to acquire an offset relationship between the magnetic-pole phase detected by the magnetic-pole detection unit and the calculation-based phase determined by the phase calculation unit, after a reference position is passed through.

Abstract: A smart motor having a permanent magnet synchronous machine and an electronic control unit, the synchronous machine including one or two permanent magnet rotor(s) and at least one six-phase stator per rotor endowed with at least two three-phase assemblies each formed of three windings electrically coupled in a star, the electronic control unit including one control inverter per stator equipped with six independent arms each configured to control one phase of a six-phase stator. The three-phase assemblies are magnetically and electrically decoupled with respect to one another.

Abstract: The present disclosure provides a brushless direct current (BLDC) motor overload detection apparatus. The BLDC motor overload detection apparatus includes a measurer for measuring an electrical angle of the BLDC motor, a determiner for determining whether a difference between the electrical angle measured by the measurer and a mechanical angle of the BLDC motor, estimated through current supplied to the BLDC motor, is within a predetermined range, and a driving controller for control of driving of the BLDC motor according to whether the BLDC motor stalls, determined by the determiner.

Abstract: The invention relates to an electric compressor control device comprising a low-voltage domain. The low-voltage domain comprises a first control unit set up to process control commands for the control of the electric compressor, and a first voltage supply set up to supply the first control unit and connected to a low-voltage source. The low-voltage domain comprises furthermore a high-voltage domain. The high-voltage domain comprises a second control unit set up to control a power output stage, wherein the power output state inverts a dc voltage from a high-voltage source into an ac voltage in order to supply a motor of the electric compressor with the ac voltage. The high-voltage domain comprises furthermore a second voltage supply set up to supply the second control unit and connected to the high-voltage source.

Abstract: A motor-driving apparatus for driving a motor having a plurality of windings respectively corresponding to a plurality of phases is provided. The motor-driving apparatus includes a first inverter having a plurality of first switching devices and connected to first ends of the plurality of windings and a second inverter having a plurality of second switching devices and connected to second ends of the plurality of windings. A third switching device is configured to selectively connect and disconnect points at which a number of turns of each of the windings is divided in a preset ratio. A controller is configured to adjust an on/off state of the first to third switching devices based on required output of the motor.

Abstract: A thyristor bridge of an electrical converter is connected to at least one DC link and including at least one phase leg for each output phase and each phase leg being composed of two series-connected thyristor arms. The thyristor arms of a thyristor bridge are cyclically switched by: determining an upper bound for a firing angle of a thyristor arm, wherein the upper bound is determined from voltage and current measurements; and determining a firing angle for the thyristor bridge, which firing angle determines a switching time of the thyristor arm, wherein the firing angle is determined, such that it is less or equal to the upper bound.

Abstract: The present invention reduces electric power consumption of a network inverter. The inverter (1a, 1b, 1c) includes: an MPU (20a, 20b, 20c); and a power supply (10) configured to carry out electric power delivery to the MPU (20a, 20b, 20c) and to a power source circuit (40). In a case where the inverter (1a, 1b, 1c) is to enter a standby state, an electric power delivery control circuit (22) of the MPU (20a, 20b, 20c) blocks electric power delivery to the power source circuit (40).

Abstract: A method for determining current-dependent and/or rotational angle position-dependent characteristic variables of an electrical machine by setting a rotational angle position of blocking a rotor, forming a series current desired value using a series current desired value alternating signal which changes periodically and/or forming a parallel current desired value using a parallel current desired value alternating signal which changes periodically, regulating a series current using the series current desired value and/or a parallel current using the parallel current desired value, measuring phase currents of the electrical machine and determining an established series current and/or an established parallel current, producing series setting voltage coefficients and series current coefficients and/or parallel setting voltage coefficients and parallel current coefficients using a discrete Fourier transform algorithm, and calculating characteristic variables on the basis of series setting voltage coefficients and

Abstract: An electronic device package structure including a substrate, a first circuit layer, a second circuit layer, an electronic device and an input/output device is provided. The first circuit layer includes a first conductive portion, a second conductive portion and a first curve portion located between the first conductive portion and the second conductive portion. At least a partial thickness of the first curve portion is greater than a thickness of the first conductive portion. The electronic device disposed on the second circuit layer is electrically connected to the second conductive portion of the first circuit layer. The input/output device disposed corresponding to the first conductive portion is electrically connected to the first conductive portion of the first circuit layer.

Abstract: An installation structure and an installation method of a plug-in switch tube is disclosed in the present invention, the installation structure comprises, a PCB board, a plug-in switch tube fixed on said PCB board, and a housing matching said PCB board and said plug-in switch tube, wherein the lower end surface of said housing is provided with a cooling liquid flow channel, and said plug-in switch tube is pressed against the side wall of the cooling liquid flow channel by an elastic pressing-piece. The installation structure according to the present invention has the advantages of small volume, excellent heat dissipation effect, simple assembly, low cost and light weight.

Abstract: A compressor for producing compressed air, in particular for a compressed air supply system of a vehicle, includes an electric motor in the form of a brushed direct current electric motor. The compressor has at least one first and one second compressor step, which can be driven by the electric motor. The motor can be controlled by means of an electronic control module of a control device by limiting an operational flow of the motor.

Abstract: An inverter control board that is configured to be connected to an inverter for performing conversion between direct current power and multiple-phase alternating current power, wherein the inverter has arms, each arm provided for one alternating current phase and comprising a series circuit of a high-side switching element to be connected to a direct-current positive electrode and a low-side switching element to be connected to a direct-current negative electrode.

Abstract: A system includes a first module that: receives the output current from the electric motor as a feedback, the output current including a direct axis component and a quadrature axis component; and generates a first voltage command based on a virtual resistance value, the feedback, and a targeted frequency characteristic of the motor control system. The system includes: a second module that: receives a difference between the feedback and a commanded current; and generates a second voltage command based on an estimated inductance value, an estimated resistance value of an electric motor, the virtual resistance value, a targeted frequency response characteristic of the motor control system, and the response of the d-axis component of the output current being decoupled from the response of the q-axis component. The system includes an addition module that generates an input voltage command for the electric motor by adding the first and second voltage commands.

Abstract: The invention concerns a rotor for a synchronous generator having a plurality of salient poles regularly disposed on the outer periphery of a rim, each pole comprising a coil with two external terminals said, respectively, first terminal and second terminal, the poles being arranged so that two adjacent poles have either their respective first terminals or their respective second terminals facing each other, the rotor further comprising at least a first connection between first terminals and/or at least a second connection between second terminals, the rotor being characterized in that the first connection and the second connection comprises a plurality of elongated conductive plates whose each ends (A, B) are secured via a single securing mean on facing terminals.

Abstract: A control device of a motor includes difference calculation circuitry that calculates a difference between a current rotation speed and a target rotation speed of the motor, coefficient correction circuitry that outputs corrected proportion coefficient and integration coefficient by multiplying each of an initially set proportion coefficient and integration coefficient by a correction coefficient, output voltage determination circuitry that calculates at least one of a proportional term in which the difference is multiplied by the corrected proportion coefficient and an integral term in which the difference is multiplied by the corrected integration coefficient and the result is integrated and determines one of the proportional term and the integral term or the sum of the two terms as a control value of the output voltage, and signal generation circuitry that generates a control signal on the basis of the control value.

Abstract: A machine drive includes a suspension force inverter, a torque inverter, and a capacitor. The suspension force inverter provides suspension force electrical signals to suspension force electrical terminals. Each suspension force electrical terminal connects to a suspension coil of a stator winding. Each suspension force electrical signal provides a phase to a single suspension force electrical terminal. A single stator winding is associated with each phase. The torque inverter provides torque electrical signals to torque electrical terminals. Each torque electrical signal provides the phase to a single torque electrical terminal. Each torque electrical terminal connects to both the suspension coil and a torque coil of the single stator winding of the associated phase. The capacitor connected in parallel across the suspension force inverter. The torque inverter is connected to a voltage source. The capacitor is connected to the voltage source through the torque invertor and the suspension force inverter.

Abstract: Embodiments include techniques for estimating unknown or missing values for parameters of a motor based on high-level motor information and using the estimated parametric values in generating an executable model for modeling the behavior of the motor. An aspect of the techniques involves assumptions used to establish the predetermined parametric values that are applied to the algorithm for deriving estimates of the unknown parametric values for the motor. The estimated parametric values may then be used in the executable model of the motor to enable development and simulation of a plant (e.g., a closed loop system) including a plant model having a dynamic controller model and a lumped parameter model of a modeling environment of a technical computing environment executing on a data processing system. The simulation of the plant loop can be sufficient to test the dynamic (e.g., feedback-based) controller within a closed loop system, e.g., test motion control of a motorized vehicle seat.

Abstract: A vehicle includes an electric machine. The vehicle includes a controller configured to repeatedly adjust power outputs for the two inverters so that they differ to drive the difference toward zero and such that power provided to the electric machine satisfies demand until the difference falls below a second predetermined threshold. The controller may be configured to adjust responsive to a temperature difference between two inverters associated with the electric machine exceeding a predetermined threshold.

Abstract: A brushless motor control apparatus includes an inverter circuit that applies a drive voltage to a winding of each phase of a brushless motor, a rotor magnetic pole detector that outputs a magnetic pole detection signal corresponding to a rotor position of the brushless motor based on a change of a magnetic pole detected by a Hall sensor, a rotor position estimator that outputs, each time a level of the magnetic pole detection signal is switched, an estimated rotor position signal that indicates an estimated rotor position with an electrical angle and indicates a predetermined electrical angle corresponding to the level after switching, a current detector that detects a current supplied to the inverter circuit as a power source current value, and an electrical angle correction unit that corrects the estimated rotor position signal by determining an electrical angle offset based on fluctuation in the power source current value and adding the electrical angle offset to the electrical angle indicated by the esti

Abstract: A motor control device including a PWM generator generating a PWM generator generating a PWM signal to be outputted to a drive circuit that energizes a winding of a switched reluctance motor; a rectangular wave generator outputting a rectangular wave signal of 1 pulse or more to the drive circuit in 1 drive period of each phase based on a rotational position of the motor; and a drive signal switcher executing switching so that a PWM drive by the PWM signal is performed when a rotational speed of the motor is equal to or less than a threshold value and a rectangular wave drive by the rectangular wave signal is performed when the rotational speed of the motor is greater than the threshold value. The PWM generator synchronizes a timing to start generation of a carrier of the PWM signal with rising of the rectangular wave signal.

Abstract: A critical conduction mode (CRM) bridgeless PFC system includes a PFC converter connected to an Alternating Current (AC) source, a zero-current detection (ZCD) circuit for detecting a zero-current state of the PFC converter, a zero-voltage switching (ZVS) detection circuit, and a processor. Voltage divider circuits receive a first voltage and a supply voltage from the PFC converter and the AC source. The ZCD circuit receives divided voltages generated by the voltage divider circuits and generates a ZCD signal. The ZCD signal is used by the ZVS detection circuit to generate a ZVS flag, which is used by the processor to control switching of first through fourth transistors of the PFC converter.

Abstract: A vehicle includes a traction motor having resonance frequency zones, an inverter including switches arranged to drive the traction motor, and a controller. The controller operates the switches only within specified sets of carrier frequencies such that noise side bands corresponding to the carrier frequencies fall outside the resonance frequency zones.

Abstract: Provided is driving control method of Brushless DC (BLDC) motor, including: a step of initial driving command input, initially inputting a driving command to the BLDC motor; a step of the first position alignment, compulsively aligning rotor of the BLDC motor at a predetermined position; a step of forced driving, compulsively driving the rotor of the BLDC motor compulsively aligned by accelerating the rotor of the BLDC motor; a step of feedback control, performing feedback control of the BLDC motor; a step of driving off, inputting a stop command to the BLDC motor; and a step of the second position alignment, compulsively aligning the rotor of the BLDC motor at the predetermined position again.

Abstract: Systems and methods are disclosed for extracting underground objects using a beam pumping unit including a rotating motor and one or more cranks coupled to a walking beam enabling the extraction. According to certain embodiments, the method includes receiving, at a control system, one or more input signals; and providing, based on the input signals, one or more control signals to the rotating motor to enable the rotating motor to directly drive the one or more cranks for extracting the underground objects. The method also includes varying, based on the one or more control signals, a rotating speed of the rotating motor based on one or more conditions of the underground objects; and enabling the extraction in a reciprocated manner based on the varying rotating speed of the rotating motor.

Abstract: A domestic refrigeration device and a method for operating a domestic refrigeration device. The domestic refrigeration device has a heat-insulated body with a coolable inner container which delimits a coolable interior provided for storing food. A coolant circuit is provided for cooling the coolable interior and includes a compressor and a field-oriented electric drive. The field-oriented electric drive has a field-oriented controller, a converter, and a permanently excited synchronous motor which is connected downstream of the converter and which is part of the compressor or is provided for driving the compressor.

Abstract: Power converters, controllers, methods and non-transitory computer readable mediums are presented, in which a processor operates a switching rectifier in a first mode to regulate a DC bus voltage signal using rectifier switching control for motoring rectifier operation when the measured DC bus voltage value is less than or equal to a first threshold value, operates the switching rectifier in a second mode to regulate the DC bus voltage signal using rectifier switching control for regenerative rectifier operation when the measured DC bus voltage value is greater than the first threshold value and less than or equal to a higher second threshold value, and operates an inverter in a third mode to regulate the DC bus voltage signal using inverter acceleration/deceleration control when the measured DC bus voltage value is greater than the second threshold value.

Abstract: To avoid control failure resulting from startup of a PMSM that is windmilling, initial speed and position are determined before startup. A controller uses a FOC routine having a speed PI control loop, field-weaken control, a current PI control loop, and a speed observer. When the controller receives an instruction to start the PMSM, it delays startup and executes an “estimation” stage, in which the controller executes the FOC routine but with the speed PI control loop and the field-weaken control disabled. The estimation stage is repeated multiple times, with estimates converging to actual speed and position through successive iterations. When estimated speed and position values have stabilized, the motor is started using the estimates as initial speed and position for driving the PMSM. The FOC routine, with the speed PI control loop and the field-weaken control enabled, is used to drive the PMSM.

Abstract: A position estimation unit of a motor control apparatus includes a counter electromotive voltage estimation unit configured to estimate a counter electromotive voltage generated in a motor based on generated voltage and current of the motor, and an arc tangent calculation unit configured to perform an arc tangent calculation using coordinate data on a two-dimensional plane based on the estimated counter electromotive voltage to calculate an angle of deviation. The arc tangent calculation unit includes a rotation calculation unit configured to repeatedly perform a rotation calculation of coordinate data on a fundamental wave and a harmonic; a rotation direction judgment unit configured to judge a rotation direction of a subsequent rotation calculation based on a result of the rotation calculation of the rotation calculation unit; and a deviation angle calculation unit configured to calculate a total of rotation angles obtained as a result of the rotation calculation.

Abstract: An inverter-integrated electric compressor includes an inverter housing portion, an inverter device including a substrate having an inverter circuit mounted thereon, the inverter device being integrally incorporated in the inverter housing portion, and a busbar assembly formed by a UVW busbar covered by a resin case, the UVW busbar conducting AC power converted by the inverter circuit from the substrate side to a motor terminal. In such a compressor, the busbar assembly includes an adhering partition adhered to an end surface of the substrate using an adhesive, the adhering partition being provided in an upright manner on a lower surface of the resin case of the busbar assembly; a height (H) and a gap (S) of the adhering partition relative to the end surface of the substrate are set as appropriate; and the adhering partition and the end surface of the substrate are adhered to each other using the adhesive.

Abstract: A motor assembly broadly includes a motor, a motor controller, and an interface controller having an integrated power supply. The integrated power supply includes an AC to DC power conversion and voltage reduction component. The motor controller and the interface controller receive line voltage electrical power without the need for an external transformer.

Abstract: A method of controlling an electric motor that generates an output current from an input voltage command that includes a sum of a first voltage command and a second voltage command is provided. The method receives the output current from the motor as a feedback. The method determines a first set of gain factors to generate the first voltage command based on the feedback such that the input voltage command causes the motor to generate the output current with reduced influence of variations of a set of operating parameters of the motor. The method determines a difference between the feedback and a desired current. The method determines a second set of gain factors to generate the second voltage command based on the difference such that the input voltage command causes the motor to generate the output current as a first, second or higher order response.

Abstract: A method for controlling a motor based on a variable current controller gain may include a temperature function current applying mode in which when a torque command for the motor is detected by an inverter, 3-phase current to be applied to the motor is output to the motor in consideration of a motor temperature of the motor as a function.

Abstract: A TH terminal receives an analog control voltage VTH which indicates a rotational speed. With a first platform, a capacitor and a discharging resistor are connected in parallel between an OSC terminal and the ground. A charging resistor and a first switch are arranged in series between the OSC terminal and a reference voltage line via which a stabilized voltage is supplied. When an oscillator voltage VOSC that occurs at the OSC terminal reaches an upper-side threshold VH, a switching circuit turns off the first switch. When the oscillator voltage VOSC falls to a lower-side threshold value VL, the switching circuit turns on the first switch. The oscillator voltage VOSC is compared with the voltage at the TH terminal, so as to generate a pulse-modulated control pulse S3.

Abstract: In various embodiments, a method of controlling a motor and motor control system may be provided. The method may include applying exciting pulse-width-modification (PWM) or continuous sinusoidal voltages to a motor. The method may further include measuring one or more the applied exciting voltages to the motor. The method may further include measuring one or more currents from the motor. The method may also include calculating one or more back electromotive force (BEMF) voltages based on the one or more currents. The method may include adjusting the exciting voltages based on the one or more back electromotive force (BEMF) voltages and the phase angle difference between the calculated back EMF voltages and the measured currents. The motor control system may include the various detecting circuits of the exciting voltages and the motor currents from the motor with low pass filters.

Abstract: Described is an electrical machine, including: a rotor having a magnetic flux source mounted thereto; a stator winding arrangement having a first set of electrical connections to provide a first output channel, and a second set of electrical connections to provide a second output channel, the first and second channels being electrically out of phase, wherein the stator winding arrangement is constructed from a plurality of winding portions which are connected in electrical series.

Abstract: A control circuit for a motor of a compressor includes an inverter control module configured to control power switching devices of an inverter to generate output voltages from a DC power supply. The output voltages are applied to windings of the motor. A current control module is configured to generate voltage signals based on a torque demand. The inverter control module controls the power switching devices according to the voltage signals. A selector is configured to output one of an open loop torque value and a closed loop torque value as the torque demand. An open loop torque module is configured to generate the open loop torque value. The open loop torque module is configured to apply an upper limit to the open loop torque value. The upper limit is based on a voltage of the DC power supply.

Abstract: A variable frequency motor drive comprises a converter including a rectifier having an input for connection to an AC power source and converting the AC power to DC power. A DC bus is connected to the rectifier circuit. At least one bus capacitor is across the DC bus. An inverter receives DC power from the DC bus and converts the DC power to AC power to drive a motor. A controller is operatively connected to the converter. The controller comprises a speed control controlling the inverter responsive to a speed command to maintain a desired motor speed. A speed foldback control measures DC bus ripple voltage and regulates the speed command responsive to the measured DC bus ripple voltage.

Abstract: A method according to an exemplary aspect of the present disclosure includes, among other things, controlling a power supply system to avoid an over-voltage event across one or more switching devices of the power supply system, the controlling step based on switching overlap information that includes instructions for either advancing or retarding a switching signal associated with at least one of the switching devices.

Abstract: Platforms and techniques are provided for controlling a power inverter using space vector pulse width modulation (PWM) operation. The inverter converts a direct voltage (DC) power source to an alternating voltage (AC) output by controlling a set of three phase switches. A bootstrap capacitor is coupled to each switch. When each switch in the set of three phase switches is in a zero state, the coupled bootstrap capacitor can charge from the current delivered in a corresponding pulse width modulation (PWM) signal. The bootstrap capacitor can deliver stored power when a one (high) switch state is entered. Each switch can be maintained at a zero state, and thus charge the bootstrap capacitor, for at least two consecutive segments of the PWM cycle. Pre-charging of the bootstrap capacitor is ensured before power delivery is required.

Abstract: A method is described for activating a multiphase machine that has a link circuit equipped with a link circuit capacitor, phase windings, and one high-side switch and one low-side switch per phase. The switches associated with the individual phases have control signals applied to them by a control unit. The control unit provides, in successive activation cycles, pulse-shaped control signals for the switches, the pulse widths and pulse onsets of which are respectively varied within an activation cycle in such a way that the link circuit current is reduced.

Abstract: A power generator for a hydro turbine is axially coupled to the hydro turbine. The generator comprises a rotor arranged to rotate about an axis in response to fluid flow through said turbine. A first stator structure incorporates at least a first winding disposed circumferentially around the axis and axially displaced in a first inboard direction from the rotor. A second stator structure incorporates a least a second winding disposed circumferentially around the axis and axially displaced in a second outboard direction from the rotor, the rotor being arranged to electrically couple with the windings.

Abstract: In a semiconductor device, semiconductor chips and lead frames are soldered at the same time on an insulating circuit board by one reflow soldering, and the positions of the externally led out lead frames undergo no change. In manufacturing the semiconductor device, after power semiconductor chips and control ICs are mounted on an insulating circuit board, and lead frames are disposed thereon, the semiconductor chips and lead frames are soldered at the same time on the insulating circuit board by one reflow soldering. Furthermore, after a primary bending work is carried out on the lead frames, and a terminal case is mounted over the insulating circuit board, a secondary bending work is carried out on the lead frames.

Abstract: A motor drive device includes an inverter for generating an AC voltage from a DC voltage by switching power elements, a current detection unit for detecting a current to be inputted to a motor, a current controller for generating a voltage command from a current command and a current detection value, a gate drive command generator for generating drive commands for the power elements such that a dead time in an output stage, that is a period of time in which both of the power elements for upper and lower arms that compose the output stage of the inverter are turned off, becomes a predetermined value, a gate drive circuit unit for outputting gate drive signals for the power elements, and a dead time estimator for estimating the dead time in the output stage that is produced by the gate drive signals for the power elements.

Abstract: Proposed is a motor control device that executes rotational control that follows load fluctuations in a startup mode. The proposed motor control device is provided with: detection means 4 that detects a current peak value Ip and a current electrical angle ?i based on phase currents Iu to Iw; detection means 5 that detects an induced voltage peak value Ep and an induced voltage electrical angle ?e based on phase currents Iu to Iw and applied voltages Vu to Vw; rotor position detection means 6 that detects a rotor position ?m using ?m=?i???90° or ?m=?e???90°; velocity fluctuation detection means 15 that detects a rotational velocity ? based on this ?m; and startup means 10 that outputs a startup voltage instruction value Vp and a startup voltage phase instruction value ?v, increases the rotational velocity of the synchronous motor M with predetermined acceleration, and makes the rotational velocity ? detected by the velocity fluctuation detection means 15 be reflected in ?v.

Abstract: A magnetic gear arrangement is provided having a first gear member that generates a first magnetic field and a second gear member that generates a second magnetic field. A plurality of interpoles are disposed between the two gear members for coupling the first and second magnetic fields to control a gear ratio between the gear members. At least one interpole has wiring associated with it that can be activated to alter the magnetic flux at the interpole, so as to vary the coupling between the first and second magnetic fields. The wiring is electrically connected to an electronic filter, which modifies the current passing through the wiring, so as to modify the influence of the wiring on the magnetic flux at the interpole.

Abstract: In a system supplying power from an AC power supply to a three-phase motor via a converter and an inverter, a leakage current reducing apparatus is connected to a connection line between the AC power supply and the converter. A common mode transformer detects, as common mode voltage, common mode current flowing from the AC power supply to the connection line. The common mode voltage is inputted to a voltage amplifier via a filter apparatus. Output voltage obtained by voltage amplification passes through a capacitor and then is applied as an AC component to a neutral point of capacitors connected in a Y-connection fashion, so as to have the same phase as that of the common mode voltage. Thus, current having the same phase as that of the common mode current is supplied via the capacitors to the converter through the connection line, thereby reducing the common mode current.

Abstract: An electric motor vehicle includes an inverter, an electric motor, a power supply circuit, and a controller. The power supply circuit converts alternating current that the electric motor serving as a generator generates into direct current. The controller is supplied with electric power from the power supply circuit and controls switching elements of an inverter. The power supply circuit includes a transformer and a voltage regulator. The transformer includes a primary coil and a secondary coil, and the primary coil is connected to the electric motor. The voltage regulator adjusts the output of the secondary coil of the transformer to a predetermined direct-current voltage.