A BLDC motor comprising a permanent magnet motor rotor defining a motor axis, a motor housing and a plurality of phase winding circuits mounted on the motor housing to form a stator, wherein each phase winding circuit comprises a phase winding and a driving bridge which is to operate to drive a phase current to flow through the phase winding, and the driving bridge comprises a switching circuit to provide a switched power supply to energize the phase winding; and wherein the phase windings are disposed at different angular positions with respect to the motor axis or the motor housing.

A motor controller comprises a switch circuit and a driving circuit. The switch circuit is coupled to a motor for driving the motor. The driving circuit generates a plurality of control signals to control the switch circuit. The motor controller is configured to crop a first waveform into a second waveform, where the first waveform is transformed into the second waveform gradually. Moreover, the motor controller is configured to transform the second waveform into the first waveform, where the second waveform is transformed into the first waveform gradually. The first waveform may be an M-shaped waveform, a W-shaped waveform, or a sinusoidal waveform. The second waveform may be a trapezoidal waveform.

Disclosed is about an apparatus, a system, and a method aligning a position of a rotor by applying a specific current to align the rotor a plurality of times to reduce vibration and noise when starting an operation of the motor to align the position of the rotor.

The present disclosure is directed to a permanent magnet motor control method and system. A new structure configuration of a permanent magnet motor has a rotor with two or more permanent magnets attached thereon, a stator wound in a Y topology with three coils (windings) arranged at 120 degree among one another, and a neutral point of the wound stator wired in a manner that the voltage at the neutral point may be detected in substantially real time. The detected neutral point voltages are analyzed together with the associated vectors of the excitation current provided to the windings of the stator to determine a speed of the rotor. The determined speed of the rotor is used for vector control.

An electric machine is provided in which the magnetic field in the air gap between the stator and the rotor rotates around the air gap while simultaneously reversing in polarity at a modulation frequency that is substantially higher than the rotational frequency of the field around the air gap. The magnetic field modulation is carried out by modulating the machine stator or rotor currents at a high frequency through a power converter or inverter. The high frequency modulation of the magnetic field can reduce the size of the machine.

A motor driving circuit according to the present disclosure includes a driving voltage generation circuit, a duty detection circuit, a calibration circuit and a multiplier. The calibration circuit is coupled to the duty detection circuit and the multiplier is coupled to the driving voltage generation circuit and the calibration circuit. A motor driving method according to the present disclosure includes: detecting a duty cycle signal provided by a system terminal through the duty detection circuit; generating an adjustment signal according to the duty cycle signal through the calibration circuit; and multiplying the predetermined driving voltage by the adjustment signal through the multiplier to generate a driving voltage to a motor. The waveform of the coil current of the motor will be a sine wave. The adjustment signal represents a ratio at which the predetermined driving voltage needs to be adjusted under a specific duty of the motor.

In certain embodiments, a fluidic pump system includes a brushless slotless direct current (BSDC) motor mechanically coupled to a fluidic pump, and a motor controller communicably coupled to the BSDC motor. The BSDC motor is configured to drive the fluidic pump, and the motor controller is configured to generate command signals to drive the BSDC motor. The fluidic pump system further includes commutation circuitry coupled to the BSDC motor that is configured to provide digital sine-wave commutation of the BSDC motor and to provide an indication of movement of the BSDC motor to the motor controller.

A thyristor starter is configured to accelerate a synchronous machine from a stop state to a predetermined rotation speed by sequentially performing a first mode of performing commutation of an inverter by intermittently setting DC output current of a converter to zero and a second mode of performing commutation of the inverter by induced voltage of the synchronous machine. In a first case in which a first synchronous machine having a first inductance is started, a switching rotation speed for switching from the first mode to the second mode is set to a higher rotation speed, compared with a second case in which a second synchronous machine having a second inductance larger than the first inductance is started.

A motor driving circuit according to the present disclosure includes a driving voltage generation circuit, a duty detection circuit, a calibration circuit and a multiplier. The calibration circuit is coupled to the duty detection circuit and the multiplier is coupled to the driving voltage generation circuit and the calibration circuit. A motor driving method according to the present disclosure includes: detecting a duty cycle signal provided by a system terminal through the duty detection circuit; generating an adjustment signal according to the duty cycle signal through the calibration circuit; and multiplying the predetermined driving voltage by the adjustment signal through the multiplier to generate a driving voltage to a motor. The waveform of the coil current of the motor will be a sine wave. The adjustment signal represents a ratio at which the predetermined driving voltage needs to be adjusted under a specific duty of the motor.

An angle shift compensation system and method for controlling a sinusoidally driven motor to achieve efficient motion and reduced noise. The motor controller uses the angle shift compensation method to monitor the angle shift between a sinusoidal motor control signal configured to drive the motor and a feedback signal received from at least one position detector indicating the position of the motor rotor with respect to the motor stator. In response, the motor controller proportionally adjusts the amplitude of the motor control signal based on the monitored angle shift to maintain the angle shift substantially equal to an angle shift threshold.