Efficiency improver of brushless DC motor

摘要

A device for inhibiting electromagnetic torque ripples of a brushless DC motor includes: a driving circuit for driving a brushless DC motor; a sensor for detecting a rotor position of the brushless DC motor and generating a corresponding rotor position signal; a driving signal generator receiving the rotor position signal and converting the rotor position signal to a driving signal; a motor efficiency improver receiving the rotor position signal and converting the rotor position signal to a commutation control signal; and a DC power source; wherein the driving circuit superimpose the driving signal and the commutation control signal for generating a fitting signal, the fitting signal is characterized by that: a control voltage before and after a commutation position is closed, and the bridge driving circuit controls an output current, in such a manner that a stator current of the motor at the commutation position is zero.

主权项

1. A device for inhibiting electromagnetic torque ripples of a brushless DC motor, comprising:
a driving circuit for driving a brushless DC motor; a sensor provided on the brushless DC motor for detecting a rotor position of the brushless DC motor and generating a corresponding rotor position signal; a driving signal generator for receiving said rotor position signal and converting said rotor position signal to a driving signal, wherein a signal input terminal of said driving signal generator is connected to a position signal output terminal of said sensor, a signal output terminal of said driving signal generator is connected to a first input terminal of said driving circuit; a motor efficiency improver for receiving said rotor position signal and converting said rotor position signal to a commutation control signal, wherein a signal input terminal of said motor efficiency improver is connected to said position signal output terminal of said sensor, a signal output terminal of said motor efficiency improver is connected to a second input terminal of said driving circuit; and a DC power source for supplying said brushless DC motor, said sensor, said driving signal generator and said motor efficiency improver; wherein said driving circuit superimpose said driving signal and said commutation control signal for generating a fitting signal, said fitting signal is characterized by that: a control voltage before and after a commutation position is closed, and said driving circuit controls an output current, in such a manner that a stator current of the motor at said commutation position is zero.