Abstract: This application provides a permanent-magnet synchronous machine control method and device, and a permanent-magnet synchronous machine control system. The method includes: obtaining a d-axis current id and a q-axis current iq in a permanent-magnet synchronous machine control loop at a current moment; obtaining a fifth-order harmonic current id5th and a seventh-order harmonic current id7th in the d-axis current id in the permanent-magnet synchronous machine control loop at the current moment, and a fifth-order harmonic current iq5th and a seventh-order harmonic current iq7th in the q-axis current iq in the permanent-magnet synchronous machine loop at the current moment; determining a d-axis current idk+1 at a next moment in each switch state; determining a q-axis current iqk+1 at the next moment in each switch state based on the first current idk, the second current iqk, and the second voltage in each switch state; and determining a control policy of the permanent-magnet synchronous machine.

Abstract: A control system is disclosed for use in a zero turn vehicle, including an electric controller in communication with a pair of independent drive units. A joystick is pivotable between a plurality of pivot positions, each pivot position corresponding to a particular rotational speed and direction of each driven wheel. A plurality of driving modes stored in the controller each map a different set of speeds and directions for each driven wheel onto the plurality of pivot positions. The joystick may also rotate about a vertical axis to provide zero turn capability. In at least one driving mode, when the rotational speed of one driven wheel is zero, the rotational speed of the other driven wheels is zero, and when the rotational speed of one driven wheel is non-zero, the rotational speed of the other driven wheel is non-zero.

Abstract: A system includes a motor having a plurality of windings, a rotor and a stator magnetically coupled to the rotor, a plurality of power inverters connected to respective windings, wherein the plurality of power inverters is configured to control currents of the plurality of windings, and a controller configured to determine an injection ratio of a high-order harmonic component to a fundamental component based on a performance index, and wherein the injection ratio for a magnetizing component is different from the injection ratio for a torque component at a same harmonic frequency.

Abstract: A motor drive control device includes a drive circuit configured to drive a motor with a drive control signal for driving the motor, and a control circuit configured to perform a vector control arithmetic operation based on a detection result of drive currents of coils of the motor, to generate the drive control signal and supply the drive control signal to the drive circuit. When generating the drive control signal, the control circuit estimates a rotation angle of a rotor of the motor and a rotation speed of the rotor with a q-axis current value of a two-phase rotating coordinate system calculated with a detection result of the drive current, and a q-axis voltage command value of the two-phase rotating coordinate system, by using a linear Kalman filter including a prediction step and an update step, using a stationary Kalman filter with the prediction step expressed linearly and time-invariantly.

Abstract: A system for obtaining and analyzing data for overall joint motion from a plurality of joints of a subject experiencing a movement disorder involves a plurality of kinematic sensors configured to be placed on a body of a subject proximal a plurality of joints. The kinematic sensors are selected to measure overall joint motion with sufficient degrees of freedom for individual joints so that data collected by the sensors can be deconstructed into multiple degrees of freedom for individual joints and analyzed to provide amplitude of the movements caused by the movement disorder and/or relative contributions from and/or directional bias for each muscle group that may be implicated in the movement of each joint. The system permits determining a treatment regimen based on the amplitude of the movements and/or the relative contribution and/or directional bias of each muscle group to the movements caused by the movement disorder.

Abstract: Provided is a control device for an electric generator/motor, which includes an armature winding and a field winding, the control device including: a bridge circuit configured to energize the armature winding; a field circuit configured to energize the field winding; and an energization control unit configured to control the energization of the bridge circuit and the field circuit. The energization control unit is configured to perform, when performing switching between a generation mode and a drive mode in response to an external command to control the electric generator/motor, control on a current supply amount for the field winding, and vector control on a current supply amount for the armature winding so as to compensate for a variation in field current.

Abstract: A motor and an application apparatus are provided. The motor includes a stator having a stator core and a stator winding wound on the stator core, a rotor, a magnetic sensor configured to detect a magnetic field polarity of the rotor and output a corresponding signal, and a motor driving circuit configured to drive the rotor to rotate with respect to the stator based on the signal output from the magnetic sensor. At a rest position of the rotor, the magnetic sensor is arranged with an advance angle with respect to a polar axis of the rotor, to make the motor have a high starting torque.

Abstract: Systems and methods for determining current limits used in controlling wind turbine systems are provided. An example wind turbine controller identifies a largest current magnitude out of a first current magnitude, a second current magnitude, and a third current magnitude of a three phase power bus. The turbine controller averages the first current magnitude, the second current magnitude, and the third current magnitude to obtain an average current magnitude. The turbine controller determines a maximum current adjustment factor based at least in part on the largest current magnitude and based at least in part on the average current magnitude. The turbine controller adjusts a maximum current magnitude limit of the wind turbine by the maximum current adjustment factor to obtain an adjusted maximum current magnitude limit. The turbine controller controls the wind turbine based at least in part on the adjusted maximum current magnitude limit.

Abstract: An electrical machine includes an angular position transducer for identifying a first rotation angle of a rotor; a stator winding for generating a magnetic field; a voltage measuring instrument for sensing a pole wheel voltage at the ends of the stator winding upon a rotation of the rotor; and an identification circuit for identifying a second rotation angle from the pole wheel voltage and for identifying an angle difference between the first and the second rotation angle.

Abstract: Representative implementations of devices and techniques provide optimized control of a three-phase AC motor. A field oriented control (FOC) arrangement uses optimization components and techniques to improve power efficiency of the motor, with fast control response over a full range of motor speeds.

Abstract: A method and a circuit assembly for driving a 2-, 3- or more phase stepper motor by predetermined courses of current curves, especially for a microstep operation, is disclosed. For minimizing the memory capacity needed for storing supporting points of the course of the current curve by which the microsteps are realized, the course of the current curve is divided into a number of segments to which each a basic or main gradient between adjacent supporting points is assigned, so that for each of the supporting points only a deviation of the gradient at this supporting point from the related basic or main gradient has to be stored.

Abstract: A field control device for a synchronous rotating machine includes: a target operating condition input unit; a first subtraction unit; a final-control-quantity control computation unit that accepts the final-control-quantity deviation and outputs a field-current correction demand value; an anticipatory computation unit that outputs a field-current anticipatory demand value based on the operating condition demand values input; an addition unit that adds the field-current correction demand value and the field-current anticipatory demand value; a second subtraction unit; and a field-current regulation device that adjusts the field current based on the field current deviation.

Abstract: A system and method for preventing damage to a controller of an electric motor in a vehicle from back electromotive force, the vehicle having a battery, includes monitoring, in a circuit path, a voltage and a rotational speed generated by back-driving the motor. If power is supplied to the controller by the battery, the method includes comparing the voltage to an upper voltage threshold, comparing the rotational speed to an upper rotational speed threshold, and, if the voltage exceeds the upper voltage threshold or the rotational speed exceeds the upper rotational speed threshold, clamping the circuit path to the battery to charge the battery with the voltage. The method is performed by an electronic controller that may detect the voltage and rotational speed via controller ports, sensor transmissions, and the like.

Abstract: A method for determining the rotor position of a synchronous machine operated in field-oriented manner, which has an effective inductivity that is dependent on the rotor position, the motor current being acquired, and the motor voltage being set with the aid of a pulse-width-modulation method, a signal which is in synchrony with the pulse-width-modulation frequency being superimposed on the motor voltage value to be set, values of the motor current being acquired in synchrony with the pulse-width modulation frequency, a current component induced by the superimposed voltage signal and a residual current component, i.e., fundamental wave component, being determined, the current component induced by the superimposed voltage signal being used for determining an estimated rotor angle position, whose phase error in relation to the actual rotor angle position is reduced by means of a flux model, the residual current component being supplied to a current controller.

Abstract: A motor control circuit calculates an ?-axis current i? and a ?-axis current i? in a fixed coordinate system based on a W-phase (sensor phase) of an AC motor. The control circuit calculates the ?-axis current i? from a current iw.sns sensed in the W-phase, and the ?-axis current i? from a differentiated value ?i? determined from the variation quantity of the ?-axis current based on that the ?-axis current i? and the ?-axis current i? are in a relation of a sine wave and a cosine wave. Subsequently, the control circuit calculates a current phase x?=tan?1(i?/i?) relative to the W-phase. Subsequently, the control circuit calculates an estimation factor according to the current phase x? and determines an estimated current iu.est in the U-phase of the AC motor by multiplying the sensed current iw.sns by the calculated estimation factor.

Abstract: A method for checking the plausibility of a torque of an electric machine, calculated on the basis of a machine model, in which a first value of an electromagnetic power of the electric machine is determined from the calculated torque and a rotational speed of the electric machine. Stator current components and stator phase voltage components are calculated from the stator currents and the stator phase voltages with respect to a reference system, which is fixed in relation to the stator. A second value of the electromagnetic power of the electric machine is determined from the stator current components and the stator phase voltage components. If a deviation of the first value of the electromagnetic power of the electric machine from the second value exceeds a predefined power threshold value, the torque of the electric machine, calculated on the basis of the machine model, is classified as implausible.

Abstract: An electric motor control device includes a torque command generation portion that outputs a torque command ?c generated on the basis of a rotation speed R and specifying an output torque, a minimum energization point number generation portion that generates a minimum number of energization points, Nmin, indicating the minimum number of points to be energized in windings of an armature and a field on the basis of the rotation speed R and the torque command ?c, an energization signal generation portion that outputs an energization signal S on the basis of a state quantity M of an electric motor, the minimum number of energization points, Nmin, the torque command ?c, a DC voltage value Vdc, a current value I, and a field position ?, and an energization portion that energizes an armature winding and a field winding according to the energization signal S.

Abstract: A field winding rotating electrical machine includes a field current detection section, a field current control section configured to calculate a duty ratio of a current supplied to the field winding based on a field current detection value, to thereby control current supply to the field winding by using a switching element, and a field current correction section configured to estimate a time point when the field current becomes 0 A based on a control state of the field current, to specify the field current detection value at the estimated time point to be a field current correction value, and to subtract the field current correction value from the field current detection value, to thereby calculate the corrected field current value. The field current control section controls the current supply based on the corrected field current value calculated by the field current correction section.

Abstract: Controlling a synchronous electric machine includes determining a rotor field current of a wound rotor of the synchronous electric machine and determining a time-rate change in field flux linkage. A rotor field voltage is determined based upon the time-rate change in the field flux linkage, and a rotor field resistance is determined based upon the rotor field voltage and the rotor field current. A rotor temperature is determined based upon the rotor field resistance. Operation of the synchronous electric machine is controlled responsive to a torque command and the rotor temperature.

Abstract: A brushless starter-generator assembly includes a stator assembly, a rotor including a magnetic hub, the rotor disposed at least partially within the stator assembly and configured to rotate about an axis, and a field coil located radially outward from the rotor with respect to the axis.

Abstract: High-power synchronous motors are commonly used in mining operations, for example, in gearless draglines, gearless conveyor drives, and gearless mill drives. Substantial electromagnetic energy is stored in the inductive field windings. In the event of a system fault, such as a short in the direct current power source exciting the field windings, the electromagnetic energy needs to be discharged from the field windings. This electromagnetic energy is typically dissipated as waste heat through a resistor. Disclosed is a field discharge system in which the electromagnetic energy is captured and stored as electrical energy in a capacitor. If an ultracapacitor bank is used for storage, the charged ultracapacitor bank can be used as a backup or auxiliary power source for mining operations. The discharge time is sufficiently small that high speed circuit breakers are not needed to disconnect stator windings from the alternating current power source when a fault occurs.

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: It is presented a protection circuit for a drive circuit of a permanent magnet motor being powered by a main DC source. The protection circuit comprises a protection circuit DC source; a changeover switch being arranged to select an input to a gate of a main drive switch of the drive circuit, the input being selectable between an output of the protection circuit DC source and a second control signal; and a changeover control device connected to control the changeover switch, which changeover control device is arranged to ensure that the changeover switch is connected to the output of the second side of the protection circuit DC source when an overvoltage is detected.

Abstract: A method for braking the thermal engine of an automobile using a multiple-phase rotary electric machine (1) connected to the thermal engine and including a stator and a rotor (4) having at least one excitation winding (41). A shortcut of at least one phase of the multiple-phase rotary machine is included during the stop phase of the thermal engine. The multiple-phase rotary electric machine is capable of braking the thermal engine of an automobile during the stop phase thereof due to the fact that a shortcut is induced, during the stop phase of the thermal engine, of at least one of the phases thereof.

Abstract: In a method and a device for pulse width modulated (PWM-) activation of an electrical drive motor (2) of an adjustment arrangement based on a reference of the mechanical system of the adjustment arrangement that corresponds to a relationship between the force (F) on the drive motor (2) and the adjustment path (s) or the adjustment time (t) of the adjustment arrangement stored in a memory (9), an anticipated future force value (F(t+t0)) is determined based on the reference of the mechanical system in order to adjust the PWM activation in advance by utilizing this future force value such that motor synchronization fluctuations can be prevented upon anticipated mechanical fluctuations in the adjustment arrangement.

Abstract: A regulating method and device for loss-optimized operation of a separately excited synchronous machine having a stator and a rotor are provided. The method may include: providing reference values for stator and rotor currents, wherein the reference value for the stator current and/or the reference value for the rotor current or an auxiliary parameter representing the reference value of the stator current and/or an auxiliary parameter representing the reference value of the rotor current is dependent on a predefined reference torque; providing maximum values for stator and rotor currents; comparing reference values for the stator and/or rotor currents or an auxiliary parameter representing the reference value of the stator current and/or an auxiliary parameter representing a reference value of the rotor current to the corresponding maximum values and reducing of the reference torque by a torque value if at least one reference value reaches or exceeds the corresponding maximum value.

Abstract: In a separately excited electrical synchronous machine, and a method for operating a synchronous machine, coil windings, in particular in the form of excitation coils, are disposed on the rotor, the electrical supply of the coil windings being achieved with the aid of an inductive rotation transmitter, whose secondary winding is connected to the rotor and whose primary winding, which is inductively coupled to the secondary winding, is stationary, especially connected to the stator of the synchronous machine.

Abstract: A brushless starter-generator assembly includes a stator assembly, a rotor including a magnetic hub, the rotor disposed at least partially within the stator assembly and configured to rotate about an axis, and a field coil located radially outward from the rotor with respect to the axis.

Abstract: A rotating electrical machine including a first member (10) capable of generating a magnetic field which rotates relative to the first member, and a second member (6) which is provided with a winding through which a current can flow, such that the rotating magnetic field drives the second member in rotation. An electrical value which is at least related to the current is measured (18) and the generation of the rotating magnetic field is started (12) at a time which is determined as a function of the electrical value which is measured. A method of controlling the machine is also disclosed.

Abstract: A method for operating a synchronous motor wherein a magnetic field is generated by a first motor component in a predetermined orientation, the method including generating a relative movement between the first and a second motor component limited to a predetermined value, and determining a direction of the relative movement, wherein the generating and determining are repeated until a change in the direction of the relative movement occurs, wherein a magnetic field having a changed orientation with regard to a previously generated magnetic field is generated by the first motor component, and wherein the orientation of the magnetic field with the changed orientation is changed by a predetermined orientation section and depending on the determined direction of the relative movement. The invention encompasses an amplifier for operating a synchronous motor and a system including an amplifier and a synchronous motor.

Abstract: A first and a second drive current for an electrical drive are generated as a function of a nominal value for a movement variable, such as drive torque or rotational speed. An alternating magnetic field is generated in the drive by the drive currents. The alternating magnetic field causes movement of the drive. A first measurement signal and a second measurement signal are determined by a measurement device. The two measurement signals represent the first drive current and the second drive current. A field-producing direct-axis current component and a torque-producing quadrature-axis current component are determined as a function of the first and second measurement signals. In addition, an actual value of the movement variable is determined as a function of the measurement signals. At least one of the drive currents is generated with a variable test current component which forms a test pattern for checking the measurement device.

Abstract: A rechargeable electric power tool includes a motor driven by a secondary battery, a switching element for regulating power distribution to the motor, a motor control unit for controlling rotation of the motor through the switching element, a lead wire for supplying a drive current to the motor therethrough and a trigger switch changed over by a user for turning on or off the drive current supplied to the motor through the lead wire. In the rechargeable electric power tool, upon changeover of the trigger switch, a microcomputer determines a magnitude relation between a detected temperature outputted from a first thermistor and a first temperature threshold value. If the detected temperature is determined to be greater than the first temperature threshold value, the microcomputer is set in a limited operation mode in which a revolution number of the motor is limited to a predetermined value or less.

Abstract: A move-sled-home device is used in an optical disc drive. The move-sled-home device includes a processing unit, a motor actuator, a sled, a sled motor, and a current-detecting unit. The processing unit outputs a control signal. The motor actuator generates a driving voltage according to the control signal. The sled motor generates a driving current according to the driving voltage to move the sled. The current-detecting unit is used for receiving and converting the driving current into an indicating signal, and issuing the indicating signal to the processing unit. During a move-sled-home action, the processing unit realizes a magnitude of the driving current according to the indicating signal, thereby determining whether the move-sled-home action is finished.

Abstract: An object of the present invention is to provide a motor control apparatus that can perform an abnormality diagnosis of current sensors and achieve cost reduction. When the outputs from three current sensors, which detect individual phase currents of a 3-phase AC current supplied from an inverter to a 3-phase AC motor, indicate that the sum of the individual phase currents of the 3-phase AC current is greater than a predetermined value, a sensor abnormality judgment unit of a motor control unit judges that one of the three current sensors is abnormal. The sensor abnormality judgment unit identifies an abnormal current sensor, which is one of the three current sensors, and performs calculations in accordance with the remaining two normal current sensors to output the current in the phase detected by the abnormal current sensor.

Abstract: A system and method for exciting an electrical machine with instantaneous non-sinusoidal current waveforms is disclosed. The system includes an inverter that controls current flow and terminal voltages in an electrical machine. The controller is further programmed to receive feedback on an air gap magnetic field in the electrical machine generated by an initial sinusoidal current demand, generate a non-sinusoidal current demand based on received air gap magnetic field feedback, and input the non-sinusoidal current demand to the inverter, thereby causing the inverter to output a non-sinusoidal current.

Abstract: When cooling operation or dehumidifying operation is started, a blower fan for an evaporator and an exhaust fan for a condenser are driven at an initial rotational number. A compressor is driven at a fixed rotational number. Due to load variation, an operating current supplied from a power source is changed. When the operating current exceeds a reference value, the rotational number of the blower fan is gradually reduced. When an endothermic quantity by the evaporator decreases, a temperature of a gas refrigerant flowing through the evaporator is lowered. Since the load applied on the compressor is reduced, the operating current decreases. In this way, when the compressor is loaded, the operating current increased, however, by controlling operation of the fans as described above, it is possible to prevent that the power source is shut off due to overcurrent and operation is stopped.

Abstract: A drive system for an electrically operated vehicle includes an electric drive unit operable as a motor and as a generator, a first power source circuit with a control device for controllably outputting power, a second chargeable and dischargeable power source circuit having at least one capacitor and which is connected in parallel to the drive unit, an electric intermediate circuit connected to the first and the second power source circuits and to the drive unit, a third chargeable and dischargeable power source circuit with at least one battery and which is connected to the intermediate circuit, a first detection device for detecting an electrical voltage of the intermediate circuit, which detection device is connected to the control device, and a second detection device for detecting a characteristic value of the vehicle speed and which is connected to the control device.

Abstract: A multi-phase AC motor driving device in which occurrence of failure is not erroneously determined is provided. In a multi-phase AC motor driving device including an inverter circuit; current detecting resistances Ru, Rv, and Rw, respectively arranged on lower arm of the respective phase of the inverter circuit, for detecting phase current of the motor; and a control portion and a PWM circuit for controlling ON/OFF operation of switching devices of the inverter circuit, the determination on the occurrence of failure based on the current values detected by the current detecting resistances is not made if relays connected between the inverter circuit and the motor are turned ON and all the switching devices of the lower arms of the respective phases are turned OFF.

Abstract: A system and method for exciting an electrical machine with instantaneous non-sinusoidal current waveforms is disclosed. The system includes an inverter that controls current flow and terminal voltages in an electrical machine and a controller programmed to input an initial sinusoidal current demand to the inverter, thereby causing the inverter to output an initial sinusoidal input current. The controller is further programmed to receive feedback on an air gap magnetic field in the electrical machine generated by the initial sinusoidal current demand, determine an instantaneous fundamental component and instantaneous harmonic components of the air gap magnetic field, apply a correction to the instantaneous fundamental component of the air gap magnetic field to generate an ideal fundamental component, generate a non-sinusoidal current demand based on the ideal fundamental component, and input the non-sinusoidal current demand to the inverter, thereby causing the inverter to output a non-sinusoidal current.

Abstract: In a drive system of an AC motor in which a motor current is feedback-controlled, a motor current command is produced in a normal operation according to a torque command value on an optimum efficiency characteristic line so as to select an optimum current phase maximizing an output torque with a constant motor current amplitude. Conversely, when the AC motor produces an excessively generated power exceeding a regeneratable power quantity of the AC motor, a consuming operation is performed for intentionally increasing the power loss in the AC motor. In the consuming operation, the motor current command is produced according to the torque command value on a loss increase characteristic line to change the current phase from the above optimum value. Thereby, the power loss in the AC motor can be increased to consume the surplus power without causing instability in the motor control.

Abstract: The present invention provides an initial pole position estimating apparatus and method for an AC synchronous motor without using magnetic pole detector. The initial pole position estimating apparatus includes a thrust force or torque pattern generating portion for generating a thrust force or torque pattern, a pole position command generating portion for generating a pole position command, and a position detecting portion for detecting a position of the AC synchronous motor. The initial pole position estimating apparatus can estimate an initial pole position in a short time with high precision without depending on a fluctuation in a load. The initial pole position estimating apparatus further includes a pole position correcting portion (8) for correcting the pole position command and a thrust force or torque pattern correcting portion (9) for correcting the thrust force or torque pattern, and an initial pole position is estimated through a repetitive correction.

Abstract: A control circuit of a motor includes at least two sensor chips and at least two winding sets. The sensor chips are electrically connected to each other, and each of the winding sets has a first winding and a second winding. The first end of the first windings and the first end of the second windings are electrically connected to each other, and the second end of the first windings and the second end of the second windings are electrically connected to the sensor chips correspondingly. In addition, a motor having the control circuit is also disclosed.

Abstract: A rotating electrical machine including a first member (10) capable of generating a magnetic field which rotates relative to the first member, and a second member (6) which is provided with a winding through which a current can flow, such that the rotating magnetic field drives the second member in rotation. An electrical value which is at least related to the current is measured (18) and the generation of the rotating magnetic field is started (12) at a time which is determined as a function of the electrical value which is measured. A method of controlling the machine is also disclosed.

Abstract: An electrical machine, such as a switched reluctance motor, has a rotor and a controller arranged to energize at least one electrically energizable phase winding in dependence on the angular position of the rotor. The controller may employ a control law table derived by applying a predetermined DC link voltage to the windings. Differences between an applied DC link voltage and the predetermined DC link voltage may be compensated by applying a predetermined correction to the angular position of energization of the phase winding in dependence on the value applied DC link voltage. Such a compensation factor may be derived from a relationship held in memory.

Abstract: The aim of the invention is to provide a speed control method for reducing current ripple and speed ripple at constant dynamics behavior while reducing the hardware required to a minimum. For this purpose, a control signal, especially a speed deviation (ev) is divided up into at least two signal portions (evhi and evlo). Every one of the at least two signal portions (evhi and evlo) is processed in a different manner. The low-order portion (evlo) can be smoothed by means of a low-pass filter (F). In an adder (Sum6) mounted downstream thereof the differently processed signal portions are then added up for further control.

Abstract: A method and system for adaptively controlling a hybrid vehicle comprises a recorder for recording a historical load or duty cycle of vehicle during or after operation of the vehicle. A classifier classifies the historical load in accordance with a load category. A controller assigns at least one of a current control curve and a slew rate control curve associated with the load category for a defined time period after the recording of the historical load or if the vehicle is presently operating generally consistent with the load category. At least one of the current control curve and the slew rate control curve, or data representative thereof, are used to control an operation of an electric drive motor of the vehicle for the defined time period.

Abstract: An electric power converter, electric power converter controlling method and electric power converting system for converting multi-phase alternating-current inputted from a generator and outputting multi-phase alternating current for controlling a drive of a motor. An input power factor commanding section outputs a command value of an input power factor according to an operating condition of the motor, and an input power factor controlling section controls the input power factor of the generator on the basis of the command value of the input power factor from the input power factor commanding section.

Abstract: Electronic motor regulation for a pump with a multi-phase permanent-magnet synchronous motor (PMSM). The system is enabled to detect and estimate a rotor phase position and rotary speed. Foam or air operation is detected by way of fluctuations in the estimated rotary speed.

Abstract: A motor driving circuit includes an inverter circuit including switching devices connected in a bridge manner, electric-current detection resistances connected between the lower switching devices in the inverter circuit and the ground, so as to enable detection of the phase currents with the electric-current detection resistances, a PWM circuit which controls ON/OFF of the switching devices and repeatedly causes powering and regenerative time intervals, by alternately turning on and off the upper switching devices and the lower switching devices. During a time interval during which the lower switching devices, the electric-current detection resistances and the motor constitute a closed circuit and a regenerated electric current flows through the circuit, when the electric current values detected are equal to or greater than a predetermined electric current value, it is determined that a ground fault has occurred in the connection lines between the inverter circuit and the motor.

Abstract: A system and method for controlling a permanent magnet motor are disclosed. Briefly described, one embodiment receives a torque command and a flux command; receives information corresponding to a direct current (DC) bus voltage and a motor speed; computationally determines feedforward direct-axis current information and feedforward quadrature-axis current information from a plurality of parameters associated with the permanent magnet motor; determines a current signal (idq*) based upon at least the requested torque command, the flux command, the DC bus voltage, the motor speed, the feedforward direct-axis current information, and the feedforward quadrature-axis current information; and controls a power inverter that converts DC power into alternating current (AC) power that is supplied to the permanent magnet motor, such that the permanent magnet motor is operated in accordance with the determined idq*.