초록 ▼

This invention relates to a motor control circuit for a permanent magnet motor having a rotor and motor windings. A motor winding transformer circuit is coupled to motor windings and provides an output signal representative of the magnitude and direction of the real current present in the motor wind

This invention relates to a motor control circuit for a permanent magnet motor having a rotor and motor windings. A motor winding transformer circuit is coupled to motor windings and provides an output signal representative of the magnitude and direction of the real current present in the motor windings. A rotor speed/position sensing circuit provides an output signal representative of the motor speed and direction.

대표청구항 ▼

A motor control circuit for a permanent magnet motor having a rotor, motor windings, motor winding current transformer means and a rotor speed/position sensing means, a power supply means coupled across said motor windings, said power supply providing a motor voltage waveform to said motor windings,

A motor control circuit for a permanent magnet motor having a rotor, motor windings, motor winding current transformer means and a rotor speed/position sensing means, a power supply means coupled across said motor windings, said power supply providing a motor voltage waveform to said motor windings, a load to be positioned by said motor, a load position sensing means, said load drivingly coupled to said motor rotor, command means to provide a load position command signal to command a load position, said motor control circuit including in combination: load position error detecting means coupled to said load position sensing means and to said command means, said load position error detecting means providing a load position error signal which is a function of the difference between a load position sensed and a load position commanded by said load position command signal, reference speed means receiving said load position error signal and providing a reference speed signal output having a magnitude and direction proportional to a rotor speed required for a load position commanded by said load position command signal, speed signal summing means coupled to said rotor speed/position sensing means to receive a signal representative of said rotor speed, said signal summing means additionally coupled to said reference speed means to receive said reference speed signal output, said summing means thereby providing a speed error signal which is a function of the difference and direction between said sensed rotor speed and said reference speed signal, means to receive said speed error signal and provide a real current reference signal having a magnitude and direction representative of the real current required for said motor to establish said load position commanded, real current signal generating means coupled to said current transformer, said real current signal generating means providing a signal representative of the magnitude and direction of the real current present in said motor windings, real current summing means coupled through said means to receive said speed error signal and to said speed signal summing means to receive said real current reference signal, said real current summing means additionally coupled to said real current signal generating means to receive said real current signal from said motor winding, said real current summing means providing a real current error signal which is a function of the difference between the magnitude and direction of said real reference current signal and said real current signal from said motor windings, signal converting means for receiving said real current error signal and converting said real current error signal to an output signal representative of a phase angle that is proportional to said real current error signal, a phase advance waveform generator coupled to receive respectively said output signal representative of said phase angle proportional to said real current error signal of said signal converting means and to said rotor position signal of said rotor speed and position sensing means, said phase advance waveform generator providing a phase advanced power supply means control signal, said control signal causing said motor voltage waveform to be advanced by an amount equal in phase to said phase angle of said signal converting means output signal to thereby efficiently effect a motor control that is responsive to load.