Abstract: A motor is driven while suppressing drive torque ripple generated by the motor, when any of the phases is opened during the driving of the motor. A motor drive device controls the driving of a motor in which the armature windings of respective phases are independently provided. The motor drive device is equipped with: an inverter circuit for converting the DC power supplied through DC bus lines to three-phase AC powers and respectively outputting the three-phase AC powers to the armature windings of the respective phases; and a controller for controlling the inverter circuit. When any of the phases is opened in the AC powers output from the inverter circuit, the controller adjusts the difference between the phases of the respective currents flowing through the armature windings of normal phases so that the AC powers of the other normal phases except the opened phase are compensated each other.

Abstract: A motor vehicle servomotor arrangement includes an electric motor with a stator, a rotor and brushes, as well as a controller with a signal input and a signal output that is connected to the electric motor. The controller is configured to transmit a control signal to the electric motor in response to an input signal supplied via the signal input by a unique function. The controller is configured to modulate the control signal in such a way that different control signals are output upon successive identical input signals within predefined input signal ranges and/or time-variant control signals are output upon identical input signals.

Abstract: The invention provides a control circuit and a method for qualifying a fault for a synchronous machine.

Abstract: A motor control device includes output command calculation circuitry and inertial load value calculation circuitry. The output command calculation circuitry is configured to calculate a motor output command, based on a motor acceleration command and an inertial load value indicative of a magnitude of inertia of a load on a motor. The inertial load value calculation circuitry is configured to calculate an estimated inertial load value with an adaptive observer, based on the motor output command and a motor actual output to be output from the motor, and configured to calculate the inertial load value, based on the estimated inertial load value.

Abstract: A system for detecting and eliminating harmonic effects in the DQ plane of the non-sinusoidal back EMF voltages is provided. The system is a field oriented controller (FOC) that includes a poly-phase electric machine, proportional-integral-derivative controllers and a microcontroller. The microcontroller not only analyzes a stator current but analyzes a back electromotive force (BEMF) voltages to extract flux vectors of the EMF. These vectors have distortions as a result of the geometries and saturation effects inherent in the electrical machine. Therefore, the microcontroller corrects these defects by transmitting the BEMF vectors and the machine operating points, including the current rotational speed and current, into the algorithm, which in turn develops a command voltage in the DQ frame for the specific operating point. This command voltage is inserted into the control output of the current PI controller so to prevents the non-sinusoidal back EMF voltages from generating non-sinusoidal currents.

Abstract: An anomaly diagnosing device diagnoses an anomaly in a single motor driven by multiple motor drive units. The multiple motor drive units supply AC currents to multiple multi-phase windings of the motor to drive the motor. The anomaly diagnosing device includes: a power consumption calculator for calculating power consumption in each of the multi-phase windings; a power difference calculator for calculating a difference in power consumption between the multi-phase windings; and a determination unit for determining that an anomaly is occurring when the absolute value of the difference has exceeded a threshold for a predetermined period of time.

Abstract: A motor controller includes: a rotation speed estimating unit that estimates a rotation speed of an motor on the basis of current information and primary frequency information of the motor; a proximity switch that outputs an ON signal when a portion of a rotating body of the motor is in proximity and outputs an OFF signal when a portion of the rotating body of the motor is not in proximity; a rotation speed computing unit that computes a rotation speed of the motor on the basis of the ON signal and the OFF signal output from the proximity switch; and an abnormality detection unit that detects an abnormality in the rotation speed estimation value or an abnormality in the proximity switch when a difference between the estimated rotation speed estimation value and the computed rotation speed computation value is equal to or larger than a threshold.

Abstract: Low speed and high speed estimates of rotor angle and speed relative to the stator are received from a low speed estimator and a high speed estimator, respectively. LS_?_EST and a subset of torque-controlling I_Q trajectory curve (“IQTC”) parameter values appropriate to low speed rotor operation are selected for rotor speeds below a low speed threshold value ?_LOW_THRS. HS_?_EST and a subset of IQTC curve parameter values appropriate to high speed rotor operation are selected for rotor speeds above a high speed threshold value ?_HIGH_THRS. LS_?_EST and the low speed subset of IQTC parameter values remain selected for rotor speeds less than ?_HIGH_THRS after accelerating to a rotor speed greater than ?_LOW_THRS. HS_?_EST and the subset of high speed IQTC parameter values remain selected for rotor speeds greater than ?_LOW_THRS after decelerating to a rotor speed less than ?_HIGH_THRS.

Abstract: A feedback amount calculation unit uses a deviation of a current from its command value or a deviation of an air-gap flux from its command value to calculate a feedback amount. A voltage error calculation unit calculates a variation range of a voltage error between a voltage value based on a voltage equation of the electric motor and a voltage command. The presence or absence of step-out of the electric motor is determined by comparison between the variation range of the voltage error and the feedback amount.

Abstract: A method of operating a synchronous motor includes using a rotor angle observer model to calculate an observed rotor angle and a speed estimator model to calculate an observed angular speed of the rotor. The observed rotor angle may be used to ensure that the stator magnetic field generated by the stator is oriented 90° ahead of the rotor magnetic field. The observed angular speed may be used to regulate the motor operation to achieve the desired speed.

Abstract: A method of estimating an input power of a motor comprises determining an output power of the motor; determining a speed of the motor; calculating a scaling factor as a function of the speed of the motor; and estimating the input power as a function of the scaling factor and the output power.

Abstract: Using an estimated electric angle calculated by an electric angle estimation unit, a PWM control unit controls an output of a motor generator (MG2) having an abnormality of a resolver. The electric angle estimation unit converts, into an estimated rotation angle speed, a rotation speed of MG2 estimated from rotation speeds of an engine and a normal motor generator mechanically coupled to MG2. The estimated electric angle is calculated by correcting a sum of the estimated electric angle in a previous control period and an estimated electric angle change amount between the previous control period and a present control period obtained from the estimated rotation angle speed, with a calculated and estimated electric angle error. The electric angle error is estimated from a control command for an inverter and an actual current value detected by a current sensor.

Abstract: In an apparatus, a motor current limit calculator calculates a motor current limit to which a motor current is to be limited. A motor current command calculator calculates a motor current command representing a target value for the motor current. A current command corrector corrects the motor current command as a function of the motor current limit. A motor voltage command calculator calculates a motor voltage command as a function of the corrected motor current command and the motor current, and feed back the motor voltage command to the motor current limit calculator. The motor voltage command represents a target value for a voltage of the output power applied to the motor. The motor current limit calculator calculates the motor current limit in accordance with the motor current, the converter current limit, and the motor voltage command fed back from the motor voltage command calculator.

Abstract: A method for starting a drive motor. The drive motor includes a motor stator with stator coils and a motor rotor, and a control electronics system and a power electronics system which supply power to the stator coils with a predefined coil voltage and a predefined constant start-up rotation frequency to generate a rotating field to drive the motor rotor. The method includes supplying power to at least one stator coil with a coil voltage corresponding to a start value, increasing the coil voltage in steps, monitoring an electric current flowing through the power electronics system, and, when a specific minimum voltage drop is detected, terminating the increasing of the coil voltage in steps, and performing a safety increase of the coil voltage by increasing a start-up voltage value by a predefined safety value to a first operating voltage value where the motor rotor is drivable in an unregulated mode.

Abstract: A controller for a sensorless permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field caused by a current flowing through an armature is provided. The controller is configured to apply a pulse voltage for generating a magnetic field vector for searching for the initial position to each of search sections obtained by dividing a target range, narrow down a target range in such a manner that a search section in which a largest amount of current flows through the armature by application of the pulse voltage is selected as a subsequent target range, and repeat the application processing and the narrow-down processing to estimate the initial position.

Abstract: A method controls an electric drive system of a vehicle including an electric drive motor, a drive battery, and a drive inverter. The method includes detecting that a measurement of an insulation resistance between the battery and a chassis of the vehicle is below a preset threshold, detecting a closed state of relays connecting the battery to the inverter, and following the detecting the measurement and the detecting the closed state, activating a cooling fan of the electric drive motor until detecting that a measurement of the insulation resistance is above the preset threshold, within a limit of a first preset duration.

Abstract: Methods of starting a motor include coupling the motor to an AC power source via a switching circuit of a motor starter, detecting an output voltage produced by the switching circuit and responsively changing the output voltage and detecting an input voltage from the AC power source and responsively controlling a rate of change of the output voltage. Controlling the rate of change of the output voltage may include reducing a rate of increase of a magnitude of the output voltage responsive to detecting that the input voltage meets a first criterion. The methods may further include bypassing the switching circuit to connect the motor to the AC power source responsive to the output voltage meeting a second criterion or an output current provided to the motor meeting a third criterion.

Abstract: A system includes one or more synchronous generators mechanically coupled to an excitation system. The excitation system is configured to output an excitation signal to excite the synchronous generator to produce a voltage and a current at an output of the synchronous generator. During startup of the synchronous generator, the excitation system may also output pulses of the excitation signal to initiate synchronism of one or more non-rotating electric motors electrically coupled to the synchronous generator. In addition, the pulses may be output to urge rotation of the non-rotating electric motors into rotational electrical alignment with the synchronous generator and each other.

Abstract: A rotating electric machine control device includes: an inverter in each winding set of a rotating electric machine having high and low potential-side switching elements corresponding to each phase; and a controller. The controller has: a signal generator of a control signal for turning on and off the high and low potential-side switching elements; a disturbance voltage estimating device calculating a disturbance voltage estimation value of a disturbance voltage, which is generated in a normal system, based on a current flowing in a failure system when the short circuit failure occurs; and a command calculating device calculating a normal system command value in accordance with the disturbance voltage estimation value.

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

Abstract: In order to reliably determine the supply voltages (Ui) of the individual phases (L1, L2, L3) of a load (4) in a multiphase supply network (2), in particular a three-phase supply network, a measuring module (6) is provided and is used to determine the supply voltages (Ui) from measuring voltages (Ui,mess) with the aid of a matrix operation. The matrix operation is used, in particular, to compensate for potential differences or potential shifts between the measuring system and the supply network (2) without the need for hardware measures, for example a voltage transformer.

Abstract: A vehicle powertrain includes a DC-DC converter and a controller. The DC-DC converter is coupled between a traction battery and an inverter for an electric machine. The controller is configured to, in response to a rotational speed of the electric machine dropping below a back EMF threshold speed, transition to a current control based six step inverter mode and operate the DC-DC converter to output a voltage less than an open circuit voltage of the traction battery.

Abstract: System and methods for optimizing operation of a wind turbine are disclosed. In one aspect, the method also includes determining, via a converter controller of a power converter, a tap position of a tap changer configured between the power grid and a primary winding of a transformer. Another step includes calculating, via the converter controller, a primary voltage of the primary winding as a function of the tap position. The method also includes implementing, via the converter controller, a control action if the primary voltage or a measured secondary voltage of a secondary winding of the transformer is outside of a predetermined voltage range.

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

Abstract: A mobile body moves along a magnetic pole path having a magnetic pole section and a magnetic pole missing section. The mobile body includes a plurality of linear motors, a first detector, a second detector, and an estimator. The plurality of linear motors include a first linear motor. The first detector is disposed on one side with respect to the first linear motor in the path direction of the magnetic pole path, and detects a first phase angle. The second detector is disposed on the other side with respect to the first linear motor in the path direction of the magnetic pole path, and detects a second phase angle. The estimator compares a phase difference between the first phase angle and the second phase angle with a reference phase difference, to estimate whether or not the first linear motor is located in the magnetic pole missing section.

Abstract: When change amount information calculated by a change amount information calculating unit satisfies a start condition and a signal condition is true for an operation instruction the start condition and the signal condition of which are defined, an operation instruction execution control unit determines a start of the corresponding operation instruction and determines operation completion based on a completion condition determined in advance of the operation instruction. An operation instruction executing unit executes the operation instruction the start of which is determined by the operation instruction execution control unit and stops the operation instruction when the operation completion is determined by the operation instruction execution control unit.

Abstract: A driving circuit of a PMSM can include a current sampling circuit configured to generate a current sampling signal by sampling a stator current information of one phase of the permanent magnet synchronous motor; a BEMF circuit configured to receive the current sampling signal and a voltage sampling signal that represents a stator voltage of the phase, to estimate back electromotive force information of the phase, and to output a first voltage signal that represents the back electromotive force information; and a torque regulating circuit configured to generate an angle difference signal by calculating an angle difference between the first voltage signal and the current sampling signal, where the angle difference signal is configured to regulate an amplitude of a first U-shaped modulation wave such that a rotor current is in phase with the first U-shaped modulation wave for maximum torque per ampere.

Abstract: A motor control system for a permanent magnet synchronous motor (PMSM) uses two linear Hall devices to produce a first signal indicative of a strength of a first magnetic field component produced by a set of rotor magnets and to simultaneously produce a second signal indicative of a strength of second magnetic field component produced by the rotor magnets that is approximately orthogonal to the first magnetic field component. An angular position and angular velocity of the rotor is calculated based on the first signal and the second signal. A plurality of phase signals is produced based on the calculated angular position and angular velocity. Current in a plurality of field windings of the motor is controlled using the plurality of phase signals.

Abstract: A controller for controlling a multi-phase motor is described. The controller may be configured to measure a plurality of phase voltages of the multi-phase motor when the multi-phase motor is in an uncontrolled state. The controller may be configured to determine, based on the plurality of measured phase voltages, a position and a velocity of a rotor of the multi-phase motor. The velocity of the rotor includes a speed of the rotor and a direction of the rotor. The controller may be further configured to, responsive to determining that the direction of the rotor is a forward direction and the speed of the rotor satisfies a closed-loop threshold speed: set, based on the position of the rotor and the velocity of the rotor, at least one initial control condition of the rotor, and control, using closed-loop control and based on the at least one initial control condition, the rotor.

Abstract: A frequency-conversion differential protection method for an output transformer of a static frequency convertor system.

Abstract: A voltage-command correction-value computation unit outputs a correction value for correcting a voltage command value according to a bus voltage. A multiplier calculates a voltage command value acquired by correcting the voltage command value based on the correction value. A voltage-command generation unit generates and outputs three-phase voltage command values based on the corrected voltage command value calculated by the multiplier and a phase. A PWM-signal generation unit generates six drive signals corresponding to switching elements of an inverter based on the three-phase voltage command values outputted by the voltage-command generation unit and a carrier signal. The PWM-signal generation unit outputs the generated drive signals to the corresponding switching elements of the three-phase inverter, to cause the inerter to generate a high-frequency AC voltage.

Abstract: According to the method of the invention, the estimation of the angular position is obtained by calculating at least one first estimator as solution of a differential algebraic equation whose coefficients depend on electric parameters of the rotating electric machine comprising first and second inductances of a stator respectively along a direct axis and a quadrature axis with respect to a magnetic flux produced by the rotor of the machine, a resistance of a phase winding and the magnetic flux produced by the rotor. The coefficients also depend on a reference voltage of a vector pulse width modulation (10) applied to the stator of the machine, on phase currents and on first derivatives with respect to time of these phase currents. The estimation of the speed of rotation is obtained by calculating a second estimator obtained by a calculation of first derivative of the first estimator with respect to time.

Abstract: A motor control device driving a motor via an inverter circuit includes a current sensing element, a PWM signal generation unit and a current detection unit. The PWM signal generation unit is configured to generate three-phase PWM signals in a manner such that the current detection unit is capable of detecting two-phase currents at two fixed time-points within a carrier period of the PWM signal. A duty of one of the three-phase PWM signals is increased/decreased to both phase lag side and phase lead side with reference to any phase. A duty of another phase PWM signal is increased/decreased to both phase lag side and phase lead side with reference to any phase away one half of the carrier period from the reference phase. A duty of the other phase PWM signal is increased/decreased to either phase lag side or phase lead side with reference to any phase.

Abstract: A synchronous machine control device is provided with a magnet state outputter that estimates a magnetic flux of a permanent magnet forming the magnetic field of a synchronous machine. In a magnet state correction value calculation mode, the magnet state outputter calculates a magnet state correction value. In a magnet state estimation mode, the magnet state outputter obtains, from a magnet state estimation device, a magnetic flux estimation value of the permanent magnet under a given condition of a magnetic flux command and a ?-axis current command and controls a magnet state corrector to correct the magnetic flux estimation value of the permanent magnet obtained by the magnet state estimation device, by use of the magnet state correction value.

Abstract: A motor controller architecture and method of operating the same. The motor controller includes a function for estimating the low speed operation of the motor, for example by evaluating the response to a periodic excitation signal injected into the control loop of the controller architecture. Control logic for controlling the motor at transitional speeds between low speed control and high speed (back emf) control is provided in some embodiments.

Abstract: Provided herein are a motor control apparatus, an image forming apparatus, an image forming apparatus including the same, and a motor control method, by which position error of a motor and a control value for compensating for the position error are calculated and reflected in feedback control, thereby quickly removing position error of the motor.

Abstract: A control device for linear motor where a range in which the current magnetic pole position of the linear motor exists is refined using the pulse energization with a suppressed amount of movement of the mover, direct current excitation is performed while changing the refined estimated magnetic pole position by a second amount of change smaller than a first amount of change used for refinement of the estimated magnetic pole position during pulse energization, and it is determined that the estimated magnetic pole position matches the current magnetic pole position of the linear motor when the amount of movement of the mover acquired each time the estimated magnetic pole position is changed matches the amount of movement of the second amount of change.

Abstract: A driving device of a multi-phase motor having a plurality of coils is provided. The driving device includes a back electromotive force (BEMF) detecting comparator connected to one of the plurality of coils to compare BEMF generated in one end of the one of the plurality of coils with a midpoint voltage of the plurality of coils and generate a BEMF detection signal, when the multi-phase motor starts to be driven; and an initial state detecting unit configured to detect a rotation state of the multi-phase motor based on the BEMF detection signal and a hall detection signal.

Abstract: A method for operating a vehicle which has at least one steered axle and at least one driven axle, wherein at least the driven axle has at least two wheel-hub electric motors that are integrated in the respective drive wheel. In addition, an electronic control unit (BLDC controller module 1, BLDC controller module 2) is provided for the wheel-hub motors (wheel-hub motor 1, wheel hub motor 2) forming an electronic differential. Sensors detect signals (Hall signals) that correspond to the driving defaults. Correction factors for default values for controlling the wheel-hub motors are determined from the sensor signals (speed), the position of the accelerator pedal (gas pedal) or accelerator throttle and the steering angle (steering angle generator) by an interface module and the factors are forwarded to the relevant motor control units (BLDC controller module 1, BLDC controller module 2).

Abstract: A method for operating a position encoder system includes performing a closed loop position control based on a detected first position indication of a position of an actuating element. The performing of the closed loop position includes generating a position correcting variable and allocating a space vector the position correcting variable to enable an adjustment drive to be controlled. The method further includes performing a check on the first position indication or correcting the first position indication with the allocated space vector. An adjustment drive is configured to adjust the actuating element. The actuating device includes a rotating electronically commuted motor. The motor has a rotor and an electronic rotor position of the rotor is configured to be allocated to multiple positions of the actuating element.

Abstract: The invention relates to a method for operating a synchronous machine, comprising the following steps: determining a difference value between the rotor inductance of the synchronous machine in the polar axis direction and the rotor inductance of the synchronous machine in the pole-gap direction for each of a plurality of different 2-tuples from values of useful current adjusted in the rotor-fixed coordinate system of the synchronous machine; preparing a characteristic diagram for the determined difference values in dependence on the 2-tuples of the values of useful current; determining a torque-dependent operating-point trajectory for the 2-tuples of the values of useful current taking into account the magnitude of the determined difference values along the operating-point trajectory to be determined; and operating the synchronous machine according to the determined operating-point trajectory.

Abstract: A rotary electric machine control device that controls a rotary electric machine that includes a rotor in which a permanent magnet is disposed so as to provide magnetic saliency, and that performs feedback control on the rotary electric machine on the basis of a deviation between a current command and a feedback current from the rotary electric machine in a d-q-axis vector coordinate system defined by a d-axis which extends in a direction of a magnetic field produced by the permanent magnet and a q-axis which is orthogonal to the d-axis.

Abstract: A control unit for identifying a fault in an electric motor or generator, the control unit comprising means for measuring a value of a first parameter associated with the operation of the electric motor or generator; means for increasing a counter value if the difference between the measured first parameter value or a value derived from the measured value and a second value is greater than a first predetermined value; means for decreasing the counter value if the difference between the measured first parameter value and the second value is less than the first predetermined value; and means for generating a signal indicative of a fault if the counter value exceeds a second predetermined value.

Abstract: A system and method and system for receiving communications signals coded at transmission in a frequency hopping waveform includes a sensor that receives acoustic data. A detector joined to the sensor receives the data and separates signals from background noise. Logic determines when the signal ends. Clusters of signals are processed and grouped into combinations of symbols. A computer translates these symbols into messages using a codebook. When multiple possibilities exist, the message is selected from the codebook that maximizes a similarity score. Additional logic is provided to handle situations where unwanted signals are mixed into an otherwise valid symbol sequence, to find the best subset of signals forming a valid message. Selected messages are provided as output to users. In further details, the detector filters the acoustic data and transforms it to the frequency domain. A power spectrum is calculated for detecting signals in specific frequency bands.

Abstract: A method for establishing the rotor angle of a synchronous machine. The method includes determining a first estimated value for the d-axis of the synchronous machine, feeding at least one refinement voltage pulse pair into the stator of the synchronous machine, the refinement voltage pulse pairs each distanced from the first estimated value for the d-axis of the synchronous machine by the same angular value in different directions, detecting the angle-dependent refinement current responses to the refinement voltage pulses, determining the angle-dependent refinement phase differences on the basis of the respective detected refinement current response, determining first estimated curves on the basis of at least some of the angle-dependent refinement current responses, determining second estimated curves on the basis of at least some of the angle-dependent refinement phase differences. and determining a refined estimated value for the d-axis of the synchronous machine on the basis of the estimated curves.

Abstract: Motor control command output means outputs, as a motor control command, a second command value, which is calculated by second command value calculating means on the basis of a first command value generated by first command value calculating means and a current value obtained by causing motor driving system current adding means to add together currents of respective motor driving systems, to the motor driving systems of two systems constituted by a motor and drive circuits for driving the motor. The second command value calculating means may calculate the second command value by performing a d/q coordinate system current feedback calculation using the current value.

Abstract: A driving circuit drives a motor containing a first coil and a second coil. The driving circuit includes a switching unit, an operation unit and a control unit. The switching unit receives a switching signal from the control unit for driving the motor. The control unit detects the rotation speed of the motor. When the rotation speed of the motor is greater than a predetermined rotation speed, the control unit outputs a first operation signal to the operation unit to couple the first terminals of the first and second coils and couple the second terminals of the first and second coils. When the rotation speed of the motor is less than or equal to the predetermined rotational speed, the control unit outputs a second operation signal to the operation unit to couple the second terminal of the first coil to the first terminal of the second coil.

Abstract: A magnetic pole position detector includes, a voltage command unit that generates high-frequency voltage command in a dq coordinate system, a three-phase transformation unit that transforms the high-frequency voltage command in the dq coordinate system to high-frequency voltage command in a three-phase coordinate system by using an estimated magnetic pole position, a current detection unit that detects three-phase current fed from a power converter for generating drive power, a dq transformation unit that transforms the detected three-phase current to current in the dq coordinate system by using the estimated magnetic pole position, an estimated magnetic pole position calculation unit that calculates a new estimated magnetic pole position to be used in three-phase dq transformations, and a magnetic pole position confirmation unit that confirms that, when converging on a certain position, the estimated magnetic pole position is the magnetic pole position at the time when the synchronous motor is started.

Abstract: A method and a device for establishing the rotor angle of a synchronous machine.

Abstract: A control system includes a current control unit providing, in accordance with the magnetic pole position of a rotor in which permanent magnets are disposed, a first current command to a first excitation phase of a stator winding and providing a second current command to a second excitation phase, a current error calculator calculating a current error which is a difference between a current flowing through the motor during the first period and the first current command or a difference between a current flowing through the motor during the second period and the second current command, and an abnormality detection and diagnosis unit detecting an abnormality based on the speed, the direction of movement and the amount of movement of the motor and the magnitude of the current error.