Abstract: Disclosed herein is a motor driver including: a motor current phase detector configured to detect a motor current phase and output a result of the detection as motor current phase information; a motor phase detector configured to detect a motor phase and output a result of the detection as motor phase information; a phase correction value calculator configured to calculate a correction value based on a difference between the motor current phase information and the motor phase information and output a result of the calculation as compensation information; and a motor applied voltage calculator configured to calculate a motor applied voltage representing a voltage to be applied to the motor based on the compensation information and motor phase information received and output a result of the calculation as a phase-compensated motor applied voltage signal.

Abstract: A motor control apparatus includes a counter, a margin calculation portion, and a cycle set portion. The counter counts a total number of switching the current supply phase of the coils when the rotor is rotationally driven. A rotation angle of the rotor is detected on a basis of the number of switching. The margin calculation portion calculates a torque margin that is a difference between an output torque of the motor and a load torque acting on the motor. The cycle set portion sets a current supply switching cycle to shorten as the torque margin is greater. The current supply switching cycle is a cycle switching the current supply phase of the coils.

Abstract: An electric power supply network includes at least one connection point with an upstream electrical network delivering useful power to at least one input of a first electric power supply network of an electrically powered transport system, such as trolley buses, trams, metro, train, or other transport, the first electrical network presenting peak power fluctuations as a function of variable energy needs depending on traffic associated with the transport system. The first electrical network includes at least one power output capable of distributing energy, in particular recovered from the transport system and from the upstream electrical network, to at least a second electrical network, enabling energy to be supplied to electrical consumption points. At least one supervision unit monitors distribution of energy from the power output whenever at least the peak power required by the first transport system is below the useful power available upstream.

Abstract: A four-phase switched reluctance motor torque ripple three-level suppression method. A first set of torque thresholds is set in rotor position interval [0°, ?r/4]. A second set of torque thresholds is set in rotor position interval [?r/4, ?r/2]. Power is supplied to adjacent phase A and phase B for excitation. The power supplied for excitation to phase A leads the power supplied for excitation to phase B by ?r/4. An entire commutation process from phase A to phase B is divided into two intervals. In rotor position interval [0°, ?1], phase A uses the second set of torque thresholds while phase B uses the first set of torque thresholds. Critical position ?1 automatically appears in the commutation process, thus obviating the need for additional calculations. Total torque is controlled between [Te+th2low and Te+th2up].

Abstract: A vehicle is provided including an electronic power steering system, an electronic throttle control system, and a stability control system.

Abstract: An active-return control section that calculates a return control current based on a steering angle, the vehicle speed and a motor angular velocity/Gr ratio, and drives the motor by a compensated-current command value obtained by subtracting the return control current from the current command value. The active-return control section includes a base-return control current calculating section that calculates a base-return control current, a target steering velocity calculating section that calculates a target steering velocity, a return control gain calculating section that obtains a deviation between the target steering velocity and the motor angular velocity/Gr ratio and sign-processes, and calculates a return control gain by at least two among a P-control calculation, an I-control calculation and a D-control calculation, a limiter that limits a maximum value of the return control gain, and a correcting section to output the return control current by correcting the control current with output of the limiter.

Abstract: At the time of changing from an EV mode, in which a hybrid vehicle travels with the use of a second motor provided on an output side of a differential mechanism while torque that acts on any one of rotating elements of the differential mechanism is interrupted by a clutch, to an HV mode, in which the hybrid vehicle travels while transmitting output torque of an engine to a drive wheel, when the engine is started in a state where the clutch is slipped and torque is transmitted from the engine so as to increase the rotation speed of the first rotating element while the clutch is slipped, torque starts being output from a first motor such that torque input from the first rotating element to the differential mechanism to increase the rotation speed of the drive wheel is output from the third rotating element.

Abstract: A vehicle is configured with an N-phase electric machine, a first on-board electrical sub-system and a second on-board electrical sub-system. The electric machine includes a rotor and a stator system, wherein the first onboard electrical sub-system includes an inverter and the stator system is linked to the inverter. The electric machine can be operated using an inverter controller on the principle of a field-oriented control system, so that the electric machine is linked to a control unit, wherein the inverter can be controlled by the control unit, and the control unit uses a phased activation method to control the inverter.

Abstract: A drive circuit for an electric motor, has a driving source unit, configured to generate a driving source signal and a driving unit, connected to the motor and configured to drive the motor according to the driving source signal. A sensing unit senses the actual speed of the motor. A control unit stops operation of the motor when the actual speed of the motor falls below a predetermined level. A timing unit counts a predetermined time period from the time the motor stops operation. The motor resumes operation at the end of the predetermined time period.

Abstract: An electric power steering apparatus that suppresses the vibration of the operating member and improves the steering feeling due to the characteristic compensation of the assist map, without a change of a proportional and integral (PI) control gain in the current control section. The electric power steering apparatus includes a first compensating section provided at a front stage of the assist map and a second compensating section provided at a rear stage of the assist map. A current command value is calculated with a characteristic of which sloping increases for an absolute value of the steering torque being input into the first compensating section and being output from the second compensating section. Therefore, vibrations of operating members are suppressed.

Abstract: A product specification setting apparatus includes: an electronic tag for updatably storing specifications of a product; and a control computer for controlling the product according to the stored specifications. A fan motor includes: a motor driving unit for driving a motor for rotating a fan; an electronic tag for updatably storing specifications of the fan motor; and a control computer for controlling the motor driving unit according to the stored specifications.

Abstract: AC motor driving system and driving method thereof are provided. The driving system and method are capable of increasing power factor, adjusting waveform of the DC ripple voltage for increasing driving efficiency. The driving system is basically constructed by connecting three circuits. The first circuit is a three-phase full wave rectifying circuit and is used to transfer commercial electricity to a first DC voltage. Then, the second circuit is used to transfer the first DC voltage to a second DC voltage that ripples voltage thereof having a semi-sinusoidal waveform. The third circuit is an AC driving circuit, and receives the second AC voltage for driving the AC motor. Thereby, the driving efficiency can be increased. The capacitance used in the present disclosure has low capacitance value, thus the power factor can be increased, and usage time of the AC motor driving apparatus can also be increased.

Abstract: An electric motorcycle includes an electric motor, a manual transmission, a shift drum potentiometer, and an ECU. When it is determined based on an input from the shift drum potentiometer that a transmission manipulation has been performed, the ECU executes a first control operation when switching from a power transmission state to a power cut state and executes a second control operation when returning from the power cut state to the power transmission state. In the first control operation, the ECU controls an operation of the electric motor to facilitate disengagement of an engagement mechanism from a gear train of the manual transmission. In the second control operation, for facilitating engagement of the engagement mechanism with a different gear train, the ECU controls the operation of the electric motor to make a revolving speed of the different gear train close to the revolving speed of the engagement mechanism.

Abstract: Methods and systems for monitoring a variable-speed pump system to detect a blockage condition. A value indicative of pump performance is sensed and a pump load coefficient is calculated. The value of the pump load coefficient does not change substantially due to changes in pump speed and is indicative of a blockage of a drain in a liquid holding tank. A blockage of the drain is detected based at least in part on the calculated pump load coefficient and the operation of the pump is adjusted based on the detected blockage.

Abstract: A method for controlling an electric motor (such as a synchronous reluctance electric motor) is suggested, in which the torque angle in the d-q-reference frame is at least in part and/or at least at times varied depending on at least one working condition of the electric motor.

Abstract: A motor drive device is provided which is able to reduce loss between a drive power source and a controller. The motor drive device includes a plurality of motors, a single drive power source which drives these motors, and a controller which controls energizing times during which motor coils of the plurality of motors are energized, by a PWM drive method. The controller includes phase shift portion which sets a PWM signal for causing a current to flow to the motor, into a phase different per motor. By the phase shift portion setting the PWM signal for causing a current to flow to the motor into a phase different per motor, so-called overlap of energizing times of currents is avoided.

Abstract: A motor controller architecture and method of operating the same. The motor controller asynchronously generates multiphase control signals for a multi-phase electric motor, relative to the estimation of various state parameters used in generating those control signals. Latency between the state estimation task and the control signal generation task is addressed by storing a timestamp with each input data sample from the sensors, and maintaining that timestamp with the output data from state estimation. Knowledge of the timestamp value allows the control task to update the state estimates to compensate for the time difference between the input data sample and the current sampling period.

Abstract: Embodiments of a clamping system are disclosed. In some embodiments, a system used with a motor assembly and a clamping device is presented, the system adjusting torque limits in the motor assembly according to conditions, for example operating temperature of the motor assembly and aging of the clamping device and the motor assembly. The clamping device can be, for example, a stapler or a vessel sealer.

Abstract: The invention disclosed an apparatus for lifting and sliding a structure attached to the wall, comprising a lifting platform extending out over the building on the roof, and a synchronous lifting and sliding system which is arranged on the lifting platform; wherein the lifting platform comprises two platform beams extending out over the building, and a lifting beam placed on the platform beam; the synchronous lifting and sliding system comprises a hydraulic lifter arranged on the lifting beam, a hydraulic push instrument kit connected to the lifting beam, and a controller; A connecting rod is connected to one end of the hydraulic push instrument kit, and several installing holes are arranged at regular intervals on the connecting rod; The distance between the adjacent installing holes of the connecting rod matches with a stroke of the hydraulic push instrument kit; An installing ear-plate is provided on the platform beam to connect with the connecting rod.

Abstract: A control apparatus controlling a motor for driving an object to switch a shift range of a transmission includes: switching devices for energization to windings of the motor; a controller for the switching devices; a current detecting circuit for a current in the windings and the switching device; a current limit circuit keeping an average of the current within a predetermined range; a standard position learning device of the motor at a learning range such that the current limit circuit limits the current, and the motor rotates until the object stops at a limit position of a movable range; a shift range determination device; and an error determination device determining that the current detecting circuit or the current limit circuit malfunctions when the object does not reach the limit position, the shift range is in a non-learning range, and the standard position learning device starts to learn the standard position.

Abstract: On a vehicle, a converter converting and outputting a voltage, an inverter converting DC power output from the converter to AC power, and a motor driven by AC power supplied from the inverter are mounted. A control device calculates a requested voltage VHreq as an output voltage from a converter for bringing a degree of modulation Kmd of the inverter closer to a prescribed target degree of modulation Kmd#, calculates from target torque of the motor, a minimum voltage VHmin as a minimum value for an output voltage from the converter which can realize target torque of the motor, and controls the converter such that the output voltage VH from the converter is closer to a value which is greater one of the requested voltage VHreq and the minimum voltage VHmin.

Abstract: An impact rotation tool includes a motor, a switching element that performs a switching operation based on a PWM control signal, and a controller that performs PWM control on the motor with the switching operation of the switching element. The controller includes a PWM control unit that generates the PWM control signal, an impact detector that detects whether or not an impact has been generated, and a control frequency switch unit that selects a control frequency of the PWM control signal from a first control frequency, which is in an audible range, and a second control frequency, which is higher than the frequency in the audible range. The controller outputs a PWM control signal having the second frequency when detecting that an impact has not been generated and outputs a PWM control signal having the first frequency when detecting that an impact has been generated.

Abstract: An induction motor control apparatus controls an induction motor connected to drive wheels by setting a motor torque command value on the basis of vehicle information. The induction motor control apparatus calculates a first torque current command value and a first excitation current command value on the basis of the motor torque command value and estimates a rotor magnetic flux on the basis of the first excitation current command value. The induction motor control apparatus calculates a first torque command value on the basis of an estimated value of the rotor magnetic flux and the first torque current command value. Further the induction motor control apparatus calculates a second torque command value by applying filter processing to the first torque command value, a natural vibration frequency component of a drive shaft torque transmission system in a vehicle being removed in the filter processing.

Abstract: A motor controller, including: a control box including an inner wall; a circuit board; a dissipater; an IGBT module; and an insulating piece. The circuit board is disposed inside the controller box. The dissipater is disposed on the inner wall of the control box. The IGBT module is disposed on the dissipater and is in electric connection with the circuit board. The insulating piece is disposed between the dissipater and the controller and prevents the dissipater from contacting with the control box.

Abstract: An inverter device includes a source current calculator and an inverter circuit, wherein: the source current calculator calculates an average value of the DC bus current Ical during a PWM cycle through arithmetic operation executed based upon instantaneous values of the DC bus current Idc of the inverter circuit; and the source current calculator provides an estimated value by designating the average current value Ical during the PWM cycle as an input source current Isrc during the PWM cycle.

Abstract: A method of controlling an electric motor including a rotor and a stator, sensors for measuring currents flowing in the rotor and in the stator, a mechanism determining setpoints of current, and a mechanism processing the signals from the measurement sensors, the method including: determining intermediate signals by a transformation according to which stator voltages and rotor voltages of the electric motor are expressed in a decoupled reference system as a function of the signals received from the processing means, and determining signals for regulating voltage as a function of the currents flowing in the rotor and in the stator of the electric motor satisfying the setpoints of current as a function of the intermediate signals obtained by transformation.

Abstract: A method for a power conversion apparatus to drive an electric motor using a power semiconductor device. The method includes detecting or estimating a temperature of the power semiconductor device to thereby obtain a detected or estimated temperature value, adjusting a torque command of the electric motor, so that the temperature of the power semiconductor device matches a preset temperature when the detected or estimated temperature value is equal to or higher than the preset temperature, and controlling the power semiconductor device using the adjusted torque command.

Abstract: The invention relates to a drive system (1). The drive system (1) has at least two inverters (3, 31, 32, 33) and at least two motors (2). Each of the motors (2), each of which has a stator and a rotor, has at least one first coil system (21) and a second coil system (22) in the stator. Each first coil system (21) is connected to a first inverter (31) in an electrically conductive manner, and each second coil system (22) is connected to a second inverter (32) in an electrically conductive manner. The invention further relates to a method for the redundant operation of a drive system (1), wherein at least one motor exchanges electric energy with the second inverter (32) and/or one or more additional inverters (33) if the first inverter (31) fails.

Abstract: The present invention relates to a rush current limiting circuit in which a series circuit consisting of an inductor and a resistor for detecting a current is connected between a power source and a first semiconductor switch, in which there is provided a second semiconductor switch whose inter-output-terminal voltage is controlled by the voltage across the series circuit consisting of the inductor and the resistor for detecting a current, and in which the inter-output-terminal voltage of the second semiconductor switch controls the inter-control-terminal voltage of the first semiconductor switch so as to limit a current to a load; the present invention relates also to an electric power converter including the rush current limiting circuit.

Abstract: A battery pack monitoring system is provided that continually monitors the current at the fuse and, when the system determines that the fuse is close to its operating limit, limits battery pack current by limiting traction motor torque.

Abstract: A control system included in a speed selector connected by output phases to a synchronous electric motor, the synchronous electric motor being controlled according to a control law implemented by the speed selector. A first speed of the synchronous electric motor is determined by a first speed estimator. A second speed estimator is used to determine a second speed of the synchronous electric motor. The system includes a signal generator module configured to apply, to the output phases, voltages taking account of a non-constant current signal. The second speed estimator is configured to recover the current response on the output phases, to deduce therefrom the second speed of the synchronous electric motor.

Abstract: The invention provides a motor driving apparatus of the invention comprises a power semiconductor device (11) for power conversion; a driving unit (12) controlling driving of the power semiconductor device (11) to supply power to a motor; a heat transmission structure (13) transferring a heat generated from the power semiconductor device (11) to a cooling medium via a heat conduction member; a temperature detection unit (14) detecting a real temperature of the heat conduction member; a current detection unit (15) detecting a current value of an output current from the power semiconductor device (11) to the motor; a temperature estimation unit (16) calculating an estimated temperature of the heat conduction member based on the output current value; and an abnormality detection unit (17) determining presence or absence of an abnormality in the heat transmission structure (13) based on a difference between the real and the estimated temperatures.

Abstract: A method and apparatus for electric motor thermal management is provided. A thermal model allows estimation of temperatures of an electric motor and determination of a motor overload condition. The thermal model is based on electrical parameters that can be measured in a motor control circuit. An electric motor control method and circuit utilizes a back electromotive force (EMF) measurement circuit, a processor coupled to the back EMF measurement circuit for receiving a back EMF measurement and for calculating a thermal model of the electric motor, the thermal model based on a stator-to-ambient thermal resistance value accounting for a sum of a stator-to-case thermal resistance and a case-to-ambient thermal resistance, and an electric motor driver circuit coupled to the processor for providing drive signals for controlling delivery of power to the electric motor based on the thermal model of the electric motor.

Abstract: A fan rotation speed controlling device includes a first transistor, a second transistor, a third transistor, a fourth transistor, and at least one heat dissipation fan. The first transistor receives a pulse-width modulation (PWM) signal. The second transistor and the third transistor amplify the PWM signal. The fourth transistor receives the amplified PWM signal and changes its own working state according to the amplified PWM thereby controlling the magnitude of an output voltage. Consequently, the heat dissipation fan changes its rotation speed according to variation of the output voltage. The fan rotation speed controlling device is applicable to and can control the rotation speeds of a plurality of electrically connected fans which are of different specifications.

Abstract: This disclosure discloses a motor control apparatus including a current conversion part, a voltage control part, a current detection part, and a phase compensation part. The current conversion part generates a voltage command on the basis of a current deviation between a current command and an estimated current. The voltage control part controls an output voltage to a motor. The current detection part detects a motor current. The phase compensation part inputs the detected motor current and the voltage command and outputs, as the estimated current, the motor current in which a delay in phase of the motor current relative to the current command has been compensated.

Abstract: A vehicle includes an electric motor, a direct current power source, and an inverter operatively connected to the direct current power source and the electric motor. The inverter is configured to convert direct current from the power source to alternating current and to transmit the alternating current to the electric motor. The inverter is characterized by an on status and an off status. A controller is operatively connected to the inverter and is configured to control whether the inverter is on or off. The controller is configured to selectively cause the inverter to enter a mode of operation in which the inverter cycles between being on and off.

Abstract: A motor driving device includes an analog to digital conversion circuit to which a speed command voltage instructing a rotation speed of a motor is inputted, and a microcomputer configured and programmed to generate a speed command having a pulse width which is changed according to the speed command voltage based on an output signal of the analog to digital conversion circuit. Further, the motor driving device includes a signal isolator configured to transmit the speed command between an input and an output while providing isolation between the input and the output, and a drive circuit configured to generate a driving signal in response to the speed command outputted from the signal isolator and to change the rotation speed of the motor.

Abstract: The present disclosure relates to a motor control circuit and related method that includes a transform component configured to receive current values associated with a motor being driven by the motor control circuit, and output polar coordinate values representing a magnitude component and a direction component of a current space vector. The motor control circuit further includes a control component configured to receive the magnitude component and the direction component of the current space vector, and generate motor control signals for driving the motor.

Abstract: A vehicle speed acquisition unit acquires speed information indicating a vehicle speed. An output acquisition unit acquires output information indicating an output of a drive unit that drives the vehicle. An output rate derivation unit derives an output rate indicating a ratio of the output to a rated output of the vehicle at the current vehicle speed. A waste derivation unit derives waste information indicating a degree of waste of energy consumed by the vehicle. A display unit displays a waste status of the energy. When the speed is within a predetermined speed range and the output rate is within a preset first output range, the waste derivation unit derives the waste information indicating that the waste of energy when the speed is high is less than when the speed is low, even when the output rate is the same.

Abstract: A method for controlling an electric motor includes inputting a quadrature-axis current (Iq) and a direct-axis current (Id) into an electric motor, receiving speed feedback indicative of the speed of the electric motor, determining whether the speed of the electric motor increases given the input Iq, and controlling the Id to increase the speed of the electric motor by selectively weakening the electromagnetic field if the speed of the electric motor does not increase given the input Iq.

Abstract: An electric motor control system includes an inverter, an element temperature observation data acquiring device, a rotational speed upper limit setting device, and a rotational speed limiter. The inverter includes switching elements. The element temperature observation data acquiring device is configured to acquire element temperature observation data indicating an observation value of a temperature of the switching elements of the inverter. The rotational speed upper limit setting device is configured to set a rotational speed upper limit of an electric motor in accordance with the observation value of the temperature of the switching elements so as to satisfy a first condition that a voltage applicable to the switching elements in a case where the electric motor is operated at the rotational speed upper limit is lower than or equal to a withstand voltage of the switching elements.

Abstract: A motor control system and associated method includes a transform component configured to receive current values associated with a motor being driven by the motor control system, and output rotating coordinate system values representing a flux generating component and a torque generating component of a current space vector. The motor control system and method further includes a control component configured to receive the flux generating component and the torque generating component of the current space vector, and generate motor control signals for driving the motor by performing a Cartesian to polar transform to obtain values associated with a rotating coordinate system followed by an angle addition to convert the rotating coordinate system values to values of a stationary coordinate system.

Abstract: A control device of a three-phase AC motor includes: an inverter that drives the AC motor; a current sensor that senses a current flowing in a sensor phase of the AC motor as a sensor phase current; and a controller that switches on and off a switching element of the inverter to control a current flowing through the AC motor. The controller includes: a current estimation device that estimates d-axis and q-axis current estimated values based on the sensor phase current and an electric angle of the AC motor; and a zero-crossing interpolation device that interpolates a command value relating to a voltage of the AC motor when the sensor phase current is in a zero cross range, which includes a zero point. When the sensor phase current is in the zero cross range, the zero-crossing interpolation device interpolates the command value with a continuous variable value.

Abstract: An apparatus for removing hysteresis of motor driven power steering (MDPS) may include: a motor driving unit for rotating a motor; a key on/off sensing unit for sensing a key on/off of a vehicle; and an electronic control unit (ECU) for receiving a key off state of the vehicle from the key on/off sensing unit and repeating a sweep function a preset number of times. The sweep function may include applying a current having an asynchronous frequency, which does not coincide with a synchronous frequency of the motor, to the motor through the motor driving unit.

Abstract: The present invention relates to a downhole wireline tool for performing an operation in a well at a depth of up to 15 km downhole, the tool being powered by direct current at a predetermined voltage in a first end by a power supply unit which is configured to provide a specific steady-state voltage selected from a plurality of predetermined voltages, comprising an electrical motor being powered by alternating current, a frequency converter arranged between the first end and the motor, and a voltage peak reduction unit adapted to reduce the steady-state voltage of the selected power supplied to the frequency converter from the power supply, the voltage peak reduction unit comprising a capacitor, wherein the capacitor is a high temperature capacitor having a dielectric comprising a material capable of resisting a temperature above 150° C.

Abstract: In a driving switching system, an H-bridge circuit includes a first P-type MOSFET, a first N-type MOSFET, a second P-type MOSFET and a second N-type MOSFET. The first N-type MOSFET connects to the first P-type MOSFET so as to have a first connection terminal. The second N-type MOSFET connects to the second P-type MOSFET so as to have a second connection terminal, wherein the first connection terminal and the second connection terminal are connected to a coil. A first and a second kickback voltage detection module respectively detect a first kickback voltage at the first connection terminal and a second kickback voltage at the second connection terminal. In the accompanying method, a first and a second driving module are selectively used to switch the first and second P-type MOSFET and the first and second N-type MOSFET once the first and second kickback voltages reach a first or a second threshold voltage.

Abstract: The present invention relates to a direct torque control method for inhibiting torque ripples, mainly comprising the following steps: establishing an MC voltage vector switching table visually displaying degrees of change in torque and flux, and, proposing, on the basis of the MC voltage vector switching table visually displaying the degrees of change in torque and flux, an MC-DTC mark-to-space ratio computing policy for torque quantification control. The MC-DTC mark-to-space ratio computing policy allows for inhibition of torque ripples of a PMSM speed control system and for a constant switching frequency, uses the MC voltage vector switching table visually displaying the degrees of change in torque and flux, has a simple algorithm, does not reply on motor parameters, and obviates the need for rotational coordinate transformation.

Abstract: A digital nonlinear corrector of an active magnetic bearing receiving an input signal x(t) and outputting an output control signal u(t) for controlling the position of said active magnetic bearing, the input signal being digitalized by a ADC circuit and provided to an adder, the digital nonlinear corrector comprising a closed control loop delivering an intermediary sequence of numbers y[kT] and having a direct branch comprising a first proportional gain circuit and a feedback branch comprising a series connection of a low-pass filter and a dead zone circuit, such that said low-pass filter is activated when determined upper and lower values of said output control signal are reached, the output control signal reproducing the input signal when these determined upper and lower values are not reached.

Abstract: A communication system includes multiple communication nodes and a communication line. The multiple communication nodes include a master and multiple slaves. The communication line cascade-connects the communication nodes and supplies electricity. The communication line corresponds to a feeder line. Each of the communication nodes is connected with the communication line through an inductor to be supplied with electricity. The each of the communication nodes is AC coupled to the communication line to transmit and receive a communication signal. The master and the slaves perform a bidirectional communication. A communication slave is provided. The communication slave is connected with a communication line through an inductor to be supplied with electricity. A communication master is provided.

Abstract: A system and method for controlling a power train of a motor vehicle having an electric motor includes regulating the currents in the rotor and stator of the electric motor so that they reach required current values using control signals of the electric motor. The currents to be regulated and the control signals being expressed in a rotating reference frame including a plurality of axes. The control signals result from a transformation including a change of variable allowing the dynamic decoupling of the regulation along each of the axes. Regulating each axis includes an application to the current to be regulated of two different linear operators as a function of the value of the current to be regulated of that axis with respect to its required value, the result of the application of the two linear operators having to be substantially equal to the control signal of that axis.