Abstract: To provide a controller for rotary electric machine which can suppress the increase in the switching frequency by the voltage for estimation while reducing the estimation delay of the magnetic pole position (the rotational angle). A controller for rotary electric machine turns on and off switching devices which the inverter has and applies voltage to the winding, based on a comparison result between the voltage command and the carrier wave; generates the voltage command for estimation of a preliminarily set one period on a stationary coordinate system fixed to the winding; generates the carrier wave of the same one period as the one period of the voltage command for estimation; extracts the frequency component of the one period of the voltage command for estimation from the current detection value; and estimates a rotational angle based on the frequency component.

Abstract: An inverter control device 200 includes a current control unit 210 that outputs a voltage commands (Vd*, Vq*), a modulation wave control unit 220 that generates a modulation wave based on the voltage commands (Vd*, Vq*), a pulse generation unit 230 that generates a PWM pulse for controlling an inverter 100 using a modulation wave and a carrier wave of a predetermined frequency, and a pulse shift unit 250 that corrects the phase of the PWM pulse such that the PWM pulse is output in a phase corresponding to a harmonic of a predetermined order of the modulation wave in the near-zero-cross region including the zero-cross point at which the modulation wave changes across 0.

Abstract: An electric power steering device and method are disclosed. An electric power steering device according to an embodiment of the present invention comprises: a steering motor comprising a first winding and a second winding, each of Which receives applied three-phase power; a first control unit for controlling power supplied to the first winding; and a second control unit for controlling power supplied to the second winding, wherein, when one of a phase of the first winding and a phase of the second winding has failed to be opened, the control unit controlling the winding including the phase that has failed to be opened, among the first control unit and the second control unit, performs torque compensation control for additional output of compensation torque.

Abstract: A motor control device includes a PWM control unit, a carrier frequency setting unit, and a carrier frequency switching calculation unit. The PWM unite generates a signal to drive an inverter by pulse width modulation. The carrier frequency setting unit sets a carrier frequency used for pulse width modulation according to a number of rotations of a motor. The carrier frequency switching calculation unit calculates a frequency switching speed of the carrier frequency and is configured to perform a calculation method. The calculation method includes setting at least one of an emergency mode, a response priority mode, or a fluctuation suppression priority mode in response to various operating conditions.

Abstract: The invention relates to a method for calibrating the control of an electrical machine, comprising the steps of: applying at least one electrical test signal having a specified direction in a d-q coordinate system to the electrical machine; measuring the change in the rotor angle of a rotor of the electrical machine according to the applied at least one electrical test signal; and calibrating the control of the electrical machine, the control being carried out using the d-q coordinate system, and the orientation of the d-q coordinate system being determined on the basis of the measured change in the rotor angle of the rotor of the electrical machine.

Abstract: A computer implemented method for controlling commutation of a brushless DC (BLDC) motor. The method includes controlling a switching array to drive the BLDC motor at a first commutation, receiving and monitoring power consumption signals indicating power consumption of the BLDC motor, determining whether the power consumption exceeds a first threshold value, and controlling the switching array to drive the BLDC motor at a second commutation when the power consumption exceeds the first threshold value.

Abstract: A rebar tying tool (2; 302; 402) include a feed mechanism (24), which includes a first motor (32; 304) and feeds a wire (W), and a twisting mechanism, which includes a second motor (76; 306) and twists together one or more portions of the wire. A control unit (202; 350) controls the first motor and the second motor and includes a general-purpose I/O port (202c; 350c) and a motor-control-signal output port (202a; 350a). A motor-control-signal-output-destination-switching circuit (204; 310; 406) inputs motor-control signals (UH, VH, WH, UL, VL, WL) from the control unit via the motor-control-signal output port and selectively outputs the inputted motor-control signals to either the first motor or the second motor in response to input of a switching signal (SW).

Abstract: A rebar tying tool includes: a feed mechanism (24), which includes a first brushless motor (32) and performs an advancing process that advances a wire (W) and a draw-back process that draws back the wire (W); a first inverter circuit (212), which is electrically connected to the first brushless motor; and a control unit (202), which controls the first brushless motor via the first inverter circuit. The first brushless motor comprises a first Hall-effect sensor (180), which is disposed on a first sensor board (178). In the advancing process, the control unit performs lead-angle control on the first brushless motor at a first lead angle. In the draw-back process, the control unit performs lead-angle control on the first brushless motor at a second lead angle. The first lead angle is set to be larger than the second lead angle.

Abstract: Disclosed is a semiconductor integrated circuit for a regulator, including: a voltage control transistor connected between a voltage input terminal to which a DC voltage is input and an output terminal; a control circuit that controls the voltage control transistor according to a feedback voltage of an output; a first transistor which is provided in parallel with the voltage control transistor and to which an electric current in a proportional reduction from an electric current flowing to the voltage control transistor flows; a first comparison circuit that determines which of the electric current flowing to the first transistor and a predetermined current value is larger; and a first output terminal for outputting the determination result. An output of the first comparison circuit is inverted in response to the flowing to the first transistor of the electric current smaller than a preset rotation lock detection current value.

Abstract: The invention relates to an inverter for controlling an electric machine on a voltage source having a first and a second potential. The inverter comprises a plurality of bridge circuits which each comprise a first flow control valve, a second flow control valve and a connector for the electric machine, and a first interface for receiving individual control signals for the flow control valves and a second interface for detecting a switch-off signal. Each first flow control valve is configured to control current between the high electrical potential and the associated connector, and each second flow control valve is configured to control current between the associated connector and the low electrical potential. A switch-off device is configured to close either all first or all second flow control valves as a function of the shut-off signal and independently of signals on the first interface.

Abstract: A permanent-magnet synchronous motor includes an inverter power circuit that converts direct-current power to three-phase alternating-current power, a motor bodydriven by the three-phase alternating-current power, a current detector that calculates an excitation current value and a torque current value from motor stator current values and an estimated value of a magnetic pole position of the rotor, a magnetic pole position detector that determines, for output to the current detector, the estimated value from the excitation current value, the torque current value, and supply voltage information, a voltage calculation unit that calculates, by means of the excitation current value, the torque current value, and an angular velocity calculated from the estimated value, the supply voltage information that causes the torque current value to approximate a torque current command value, and an inverter controller that controls the inverter power circuit on a basis of the supply voltage information and the estimated val

Abstract: An actuating device for orthosis includes a transmission that is operatively connected to a motor such that the motor provides power to the transmission. The transmission includes a first stage, a second stage, and a third stage. Each of these stages includes at least two sprockets and a drive belt tensioned between the two sprockets. The transmission also includes a first shaft and a second shaft. A sprocket of each of the first, second, and third stages of the transmission is attached to the first shaft. An actuating arm is operatively connected to the third stage of the transmission such that the power provided to the transmission by the motor causes the actuating arm to provide an output torque.

Abstract: A motor driving circuit and a motor driving method are provided. The motor driving circuit is used to drive a motor, and includes a starting unit, a driving unit, a floating phase selecting unit, a hysteresis comparator, an integration circuit, a first comparator and a control circuit. The control circuit controls the floating phase selecting unit to select a floating phase to output a floating phase voltage signal, and controls, in response to an initial starting signal, the integration circuit to use a first integration time, and determine whether the motor has been successfully started. In response to a successful start, the control circuit controls the integration circuit to use a second integration time, and controls the starting unit to be switched to an operation mode to control the driving unit to drive the motor. The first integration time is greater than the second integration time.

Abstract: A BLDC motor and a method for starting and operating the motor. The motor has a rotor with exciter magnets, a stator with at least three stator coils, and a control and evaluation unit. The method carries out an initialization phase with a defined start time, initial starting field angle of the stator magnetic field and angle rising rate. A partial cycle is carried out with a rising phase that increases a current field angle with a change in voltage application to the stator coils. An analysis phase keeps the current field angle constant. The method continuously records a difference in current between two phase currents of a same direction of flow, the evaluation unit analyzes the recorded difference for the presence of a current eye. Immediate commutation takes place when a current eye is detected or where without detection after a pre-definable time interval has elapsed. The analysis phase is terminated after commutation is carried out.

Abstract: The present disclosure relates to an apparatus and method for controlling switching of a wiring mode of a motor capable of being operated in a plurality of wiring modes, a motor control apparatus includes a motor including a rotor that rotates according to a motor torque by a pulse width modulation (PWM) control, a switching unit provided at the motor and switching a wiring method inside the motor so that the motor is driven according to another wiring mode, and a controller generating a speed command frequency for controlling a rotation speed of the rotor, and controlling the switching unit so that the wiring mode of the motor is switched according to a result of comparing the speed command frequency with a switching boundary frequency according to the wiring mode of the motor, wherein when the PWM control is stopped in response to the switching of the wiring mode, the controller estimates a rotation state of the rotor that rotates inertially, and when the PWM control is restarted, the controller sets the es

Abstract: In one embodiment, systems and methods of controlling switch modules for dynamically deriving selective circuitries within a plurality of similar voltage energy storage devices of an energy storage system, and/or, within a plurality of stators of a motor/generator, or a plurality of stators of system of motors/generators, thereby optimizing the utilization of energy stored, consumed, and regenerated in the operation of a vehicle.

Abstract: To obtain a power conversion device capable of reducing a loss of the power conversion device to improve fuel efficiency and electricity efficiency of an electrically driven vehicle. Provided is a power conversion device (1), which is to be mounted to a vehicle (VCL) configured to travel by using a drive motor (M1) as a motive power source. The power conversion device (1) includes inverters (100, 200) each configured to control the drive motor (M1) by having a plurality of switching elements (Q101 to Q106, Q201 to Q206) subjected to switching control. In the power conversion device (1), each of the plurality of switching elements (Q101 to Q106, Q201 to Q206) is formed of a wide band gap semiconductor.

Abstract: A motor drive control device has a controller and a driver. The controller generates a control signal for controlling driving of a two-phase stepping motor so as to alternately repeat one-phase excitation in which a coil of one phase in coils of two phases of the two-phase stepping motor is excited and two-phase excitation in which the coils of two phases in the coils of the two phases are excited. The driver drives the coils of the two phases, based on the control signal. The controller determines, based on a back electromotive force generated in the coil that was not excited during the one-phase excitation, a period of performing the one-phase excitation, and determines, based on the period of the one-phase excitation performed before the two-phase excitation, a period of performing the two-phase excitation.

Abstract: An electric drive system for a vehicle includes a speed/position feedback device coupled to an electric machine and configured to provide an index pulse. The system further includes an inverter having a line voltage sensor. The system includes a controller programmed to, responsive to the electric machine rotating at a generally constant speed without commanding the inverter, generate a resolver offset from a time difference between a zero crossing of a line voltage and the index pulse and operate the inverter according to the resolver offset.

Abstract: A system according to the present disclosure includes a motor driver module and a motor position determination module. The motor driver module is configured to measure current supplied to a motor. The motor position determination module is configured to determine a first position of the motor at a first time when power supply to the motor is initially discontinued based on ripples in the current supplied to the motor during a first period before the first time. The motor position determination module is configured to determine a second position of the motor at a second time when the motor stops rotating after power supply to the motor is discontinued based on the first position of the motor and a rotational speed of the motor at the first time.

Abstract: A half-bridge driver circuit includes an amplifier configured to generate a measurement signal indicative of a current flowing through a shunt resistor. A processing circuit is configured to selectively acquire a sample of the measurement signal in response to a trigger signal. A synchronization circuit is configured to determine a first value indicative of the switch-on duration of a high side control signal, determine a second value indicative of the switching period of the high side control signal, compute a third value based on the first and second values, generate a third signal based on the third value when the next switching period of the high side control signal starts, start a second counter in response to the third signal, compare the count value of the second counter with a reference value to generate a fourth signal, and generate the trigger signal as a function of the fourth signal.

Abstract: A motor module includes a motor including a commutator, and an apparatus that is attached to the motor and obtains information on rotation of the motor. The apparatus includes a rotation angle calculator that calculates a rotation angle of the motor based on a voltage between terminals of the motor and an electric current flowing through the motor, a first signal generator that generates a first signal based on a ripple component included in the electric current flowing through the motor, a second signal generator that generates a second signal indicating that the motor has rotated by a predetermined angle based on the first signal and the rotation angle, and a rotation information calculator that calculates the information on the rotation of the motor based on an output from the second signal generator.

Abstract: A control circuit includes: a cycle counter configured to measure a cycle of revolutions per minute (RPM) signal indicating an RPM of a motor to be driven to generate a digital measurement value; and a controller configured to generate a control command based on a digital target value corresponding to a target cycle of the RPM signal and the measurement value, wherein the controller switches between a first mode in which the control command is monotonously changed and a second mode in which the control command is generated based on proportional-integral (PI) control.

Abstract: The phase error detection unit PHED detects the phase error PERR between the phase of the BEMF and the phase of the phase switching signal COMM (masking signal MSK) at each of a plurality of detection timings that become the zero crossing timings of the BEMF in the mechanical angular cycle. The PI compensator PICPa has a plurality of cycle setting registers REGN 0_0 to REGN 3_5 for each of a plurality of detection timings, and while switching the registers for each detection timing, the PI compensator determines the cycle setting value NCNTS for bringing the inputted phase error PERR close to zero by reflecting the previous cycle setting value NCNT stored in the register. The clock generation unit CGEN sequentially controls the phase switching signal COMM based on the cycle setting value NCNTS.

Abstract: A motor control apparatus includes an inverter comprising switching elements, current detection means for detecting a phase current value, conversion means for converting the phase current value into a digital AD conversion value, and current control means for controlling a three-phase AC motor by switching the switching elements using a current command value based on the AD conversion value. When the conversion means determines that an amplitude of the current command value is greater than or equal to a threshold, it acquires the phase current value at timings of at least one of t=?/8, 3?/8 and t=5?/8, 7?/8 converts the acquired phase current value into the AD conversion value. When the conversion means determines that the amplitude of the current command value is smaller than the threshold, it acquires the phase current value at a timing of t=?/2, converts the acquired phase current value into the AD conversion value.

Abstract: A method of calculating a motor position uses a hall sensor. The method can include determining a motor position in response to a signal change of a hall sensor installed to a motor, calculating a basic compensation value for compensating a motor position error due to signal measurement delay of the hall sensor, determining whether a current command condition for a constant-speed operation of the motor is satisfied, calculating a first-up compensation value and a first-down compensation value, calculating an average values of the deviation between d-q axes current commands, and correcting the motor position using the basic compensation value when a difference between the average values is less than a reference average value.

Abstract: Utilizing an asymmetric magnetic field caused by a mechanism design between a motor rotor and a stator to induce a BEMF, a method for starting a fixed rotation direction of single-phase sensorless DC brushless motor, includes: power-on starting a motor control circuit; if the motor is not in a rotating state before starting the excitation, executing a static starting procedure; then, if the motor rotation direction conforms to a predetermined direction, executing a normal driving procedure; otherwise, executing a static starting procedure. The static starting procedure, by discharging remnant energy of the motor, achieves the purpose of star-up by performing the steps of first phase excitation, stop excitation, and strong second phase excitation. In the normal driving procedure, the slope of BEMF signal of the first phase or the second phase is taken out periodically to detect the motor rotation direction.

Abstract: A motor control apparatus includes: a gate control voltage output unit that outputs a drive signal based on a corrected Hall edge that constitutes each of six Hall stages; a counter value acquisition unit that acquires a counter value which is represented by a time period between two Hall edges from the position detection signal; and a switching control unit that allows a value obtained by multiplying a previous counter value of each of the Hall stages by a preset correction coefficient to be a first delay time of each of current Hall edges and allows the gate control voltage output unit to output the drive signal based on each of the Hall edges obtained by correcting each of the Hall edges corrected by the first delay time by a second delay time that advances a Hall edge corresponding to a predetermined sensor among the plurality of sensors.

Abstract: Method and apparatus for providing error compensation for a magnetic field sensing element in a three-phase motor. In embodiments, a driving angle is determined from zero-crossings of the magnet pole-pairs and error compensation levels for the pole-pairs is determined to reduce distortions in the motor current waveform.

Abstract: The present disclosure relates to a method for determining the position of a rotor of a polyphase motor, e.g., the rotor angle, particularly at standstill. The method can include: applying voltage to phases of the motor, measuring a current in the phases, and determining the rotor position based on the measured current. According to the present disclosure, determination of the rotor position can be based on current values measured during a period where zero voltage is applied to the respective phases.

Abstract: A system for transferring electric power is provided. A power supply conductor conducts a power supply current that generates a first resultant magnetic field. An electric motor has a power input terminal connected to the power supply conductor and a movable output component. A generator has a movable input component connected to the movable output component such that the movable output component causes movement of the movable input component. The generator converts the movement of the movable input component into a power output current to the power output terminal that generates a second resultant magnetic field. A plurality of field line guides are positioned for field lines of the second resultant magnetic field to couple to the plurality of field line guides and are formed to guide the field lines into a helical shape.

Abstract: A system according to the present disclosure includes a motor driver module and a motor position determination module. The motor driver module is configured to measure current supplied to a motor. The motor position determination module is configured to determine a first position of the motor at a first time when power supply to the motor is initially discontinued based on ripples in the current supplied to the motor during a first period before the first time. The motor position determination module is configured to determine a second position of the motor at a second time when the motor stops rotating after power supply to the motor is discontinued based on the first position of the motor and a rotational speed of the motor at the first time.

Abstract: A ventilation device includes AC voltage estimation unit (32) for estimating an AC voltage, based on a DC voltage detected by voltage detection unit (30) and a current detected by current detection unit (20). Air volume computation unit (24) determines a rotation speed of a motor, based on the AC voltage estimated by AC voltage estimation unit (32) and a target air volume output from a target air volume computation unit.

Abstract: In a magnetic pole direction detection device, a detecting target magnet is attached to a tip of a rotating shaft of the rotor. A magnetic detection unit outputs a detection signal which changes according to a change in a magnetic field. A magnetic pole direction calculation unit calculates a magnetic pole direction of a rotor based on the detection signal. A current detection unit detects a current flowing through each multiphase coil. A rotating magnetic field vector calculation unit calculates a vector of a rotating magnetic field based on magnitude of the detected current. A direction correction amount calculation unit calculates a direction correction amount based on a direction and magnitude of the rotating magnetic field calculated by the rotating magnetic field vector calculation unit. A magnetic pole direction correction unit corrects the calculated magnetic pole direction by using the calculated direction correction amount calculated.

Abstract: A system for controlling an inverter may include a motor; then inverter including a plurality of switching elements turned on/off by a pulse width modulation signal, converting DC power into AC power according to on/off of the plurality of switching elements and providing the AC power to the motor; a current sensor for detecting and outputting a current provided to the motor; a rotation angle sensor for detecting and outputting a rotor angle of the motor; and a controller for performing duty determination control for determining a duty of the pulse width modulation signal on the basis of values detected by the current sensor and the rotation angle sensor and a torque command of the motor.

Abstract: A motor control device includes an energization controller that generates energization control signals of a bridge driver, an ADC that samples and converts analog feedback voltages corresponding to output voltages of the bridge driver into digital feedback signals, and a zero-crossing detector that receives the feedback signals so as to perform zero-crossing detection for determining commutation timing and PWM duty of the energization control signal. Sampling timings of the ADC are switched to one of PWM on period and PWM off period according to the PWM duty. The energization controller PWM drives lower side switches of the bridge driver, and the sampling timings of the ADC are set to the PWM off period. The ADC performs an ADC process of the feedback voltage both in the PWM on period and in the PWM off period, and the zero-crossing detector adopts one of ADC results according to the PWM duty.

Abstract: The invention relates to a method for sensor-free position determination of the rotor position of an electronically commutated multiple-phase EC motor comprising a rotor, and a stator and comprising a commutation device for generating string currents in the coil system of the stator by applying a test signal in the coil system, measuring the current value i in the strand during the measurement phase (PHMess) as a current response to the test signal, calculating i for determining the envelope determining of the current response and determining the rotor position therefrom.

Abstract: The control part includes: a gate control voltage output unit that is configured to output a drive signal which switches a switching element according to a Hall edge that forms each of six Hall stages which are represented by a combination of electric potentials of position detection signals that are outputs of a plurality of sensors; a counter value acquisition unit that is configured to acquire a counter value which is a time period of the Hall stage and which is represented by a time period between two Hall edges that form each of the Hall stages from the position detection signal; and a switching control unit that is configured to determine a value obtained by multiplying a previous counter value of each of the Hall stages by a preset correction coefficient as a delay time of each of current Hall edges and that allows the gate control voltage output unit to output a drive signal according to each of the Hall edges which are corrected by the delay time.

Abstract: A control module for preventing acoustic resonance noise generation from a heat exchanger of a heating furnace, comprising a control signal generated by the control module. The control signal is configured to operate an induction fan of the heating furnace at more than one speed for a given heat demand mode of the heating furnace.

Abstract: In a control apparatus for a power conversion apparatus, a spectrum changing unit changes a spectrum of at least one of bus harmonic components and switch harmonic components so as to meet at least one of a separation condition and a reduction condition. The bus harmonic components are harmonic components superimposed on a voltage of the bus in accompaniment with on-off operations of switches configuring at least one power conversion apparatuses. The switch harmonic components are harmonic components included in a switching pattern of switches configuring the remaining at least one power conversion apparatus. The separation condition is that the frequencies of both harmonic components are separated by a predetermined value or more. The reduction condition is that an amplitude of at least one harmonic component is reduced when the difference between the frequencies of both harmonic components is less than the predetermined value.

Abstract: The invention relates to an architecture which is applied to a six-phase rotary electric machine of the type comprising first and second three-phase systems offset angularly at a predetermined offset angle. First and second phase windings of the three-phase systems respectively carry first (U1, V1, W1) and second (U2, V2, W2) phase currents controlled by electronic power modules (15, 16, 17). The electronic modules comprise first and second power terminals (12, 13) each capable of being electrically connected to first and second instances of the first and second phase windings. According to the invention, the electronic power modules are interconnected such as to balance the losses.

Abstract: A power tool includes a multi-phase BLDC motor, a plurality of switches, an input unit, and a controller. For each phase, the controller operates to vary power output to the motor between a first power and a second power by varying a duty cycle of a PWM signal from 0% to 100% while keeping a conduction band (CB) of corresponding motor switches and/or an advance angle (AA) at a predetermined value when the input unit moves between a first position and a predetermined position between the first and a second position. For each phase, the controller operates to increase the power output by the motor to greater than the second power by increasing the CB/AA to greater than the predetermined value while keeping the duty cycle of the PWM signal at 100% when the input unit moves between the predetermined position and the second position.

Abstract: A motor control system includes a motor driving circuit and a motor. The motor driving circuit includes a control module, a PWM signal detecting module, a transient state detecting module and a driving module. The PWM signal detecting module is electrically connected to the control module to receive a PWM signal and to convert the PWM signal into a first digital PWM control signal. The transient state detecting module provides a second digital PWM control signal to the control module according to the first digital PWM control signal at a first time point and the first digital PWM control signal at a second time point. The driving module receives at least one driving signal from the control module. The control module determines whether to turn off a low side switch of the driving module according to the second digital PWM control signal.

Abstract: A rotor of a starter that employs an SR motor is directly connected to a crank shaft of an engine. The rotor and the crank shaft are set in such a way that when a piston is positioned at a top dead center or the like, salient poles and of the rotor face U-phase poles, so that an output torque of the starter comes to its maximum at a maximum pass-over torque position of the engine. When the engine is stopped, electricity is supplied through U-phase coils, thereby making the salient poles and the U-phase poles stop so as to face each other. In this manner, the piston is stopped at the maximum pass-over torque position. When the engine is started, electricity is supplied to W-phase coils which are adjacent to the U-phase coils, thereby making it possible to overcome a maximum friction torque with maximum outputs.

Abstract: In one example, a circuit includes an alternating current (AC) voltage source, a voltage rail, a reference rail, a first capacitor, a second capacitor, and a switching unit. The AC voltage source is configured to supply voltage in a first direction during a first half of a cycle and supply voltage in a second direction during a second half of the cycle. During a first state of the circuit, the voltage in the first direction supplied by the AC voltage source charges the first capacitor and the voltage in the second direction supplied by the AC voltage source charges the first capacitor. During a second state of the circuit, the voltage in the first direction supplied by the AC voltage source charges the first capacitor and the voltage in the second direction supplied by the AC voltage source charges the second capacitor.

Abstract: Provided are DC-bus voltage or DC-bus current controller methods and circuits, for a voltage or current source inverter. A mean value calculator provides an output signal comprising the mean value of the DC-bus voltage or current, which is used as a feedback signal in a closed loop of the voltage or current source inverter controller, such that a ripple in the DC-bus voltage or current is substantially prevented from entering the closed-loop. In some embodiments a droop controller, which may be adaptive, is used in the closed loop with reverse proportional gain. The adaptive droop controller may provide a constant or variable DC-bus voltage or current. Embodiments regulate the DC-bus voltage or current to an optimized value such that power losses for load and grid conditions are minimized or reduced, and voltage and current ripple is minimized.

Abstract: A drive circuit for a synchronous motor including a rotor having ten magnetic poles formed by a permanent magnet, and a stator in which a winding is wound in a concentrated manner around nine teeth facing the rotor, the drive circuit including: an inverter including a plurality of switching elements in bridge connection; and a control unit that controls the inverter in such a manner that a square-wave-shaped current flows to the winding, wherein the control unit operates in such a manner that an energization phase at which to pass the square-wave-shaped current falls within a range of electric angles of ?10° to +5° from an energization phase at which the current is minimum when a target torque of the synchronous motor is generated.

Abstract: A method and apparatus for driving motor and appliance. When a rotor of a motor rotates, a current angle of the rotor is detected at a current moment by using a Hall sensor; a back electromotive force and a phase current of the motor is detected at the current moment; a target torque coefficient is detected by using a relational model for a back electromotive force and a torque coefficient according to the back electromotive force; a current torque coefficient is detected by using a relational model for a phase current and a torque coefficient according to the detected phase current; and a compensation angle is detected according to a rotor angle compensation model and the current angle is compensated by using the compensation angle, to obtain an adjustment angle; and power supply to the motor is adjusted according to the adjustment angle by using a field orientation technology.

Abstract: A drive circuit for a synchronous motor including a rotor having ten magnetic poles formed by a permanent magnet, and a stator in which a winding is wound in a concentrated manner around nine teeth facing the rotor, the drive circuit including: an inverter including a plurality of switching elements in bridge connection; and a control unit that controls the inverter in such a manner that a square-wave-shaped current flows to the winding, wherein the control unit operates in such a manner that an energization phase at which to pass the square-wave-shaped current falls within a range of electric angles of ?10° to +5° from an energization phase at which the current is minimum when a target torque of the synchronous motor is generated.

Abstract: A motor system includes a stator magnetic pole, a driving unit and a stop control unit. The stator magnetic pole is adapted to couple with a rotor for the rotor to rotate relative to the stator magnetic pole. The stator magnetic pole has first and second ends. The driving unit is electrically connected with the stator magnetic pole and drives the rotor to rotate by changing the polarity of the stator magnetic pole. The stop control unit is electrically connected to the stator magnetic pole and the driving unit. If the rotor rotates when the motor system is not electrically powered, the stator magnetic pole generates electricity that changes the path of the electric current flowing through the stop control unit, and the stator magnetic pole outputs an electric current from the first end to the second end or from the second end to the first end thereof. In addition, a fan module is also disclosed to solve the problem.