MOTOR CONTROL APPARATUS

摘要

A motor control apparatus has an inverter circuit having a plurality of pairs of upper and lower arms provided so as to correspond to the number of phases, and switching elements provided on each of the upper arms and the lower arms of each phase that drive a motor on the basis of ON or OFF operations of the respective switching elements, a single current detector that detects a current of the motor flowing through the inverter circuit, and a duty calculator that calculates duties of a PWM signals for turning the switching elements ON or OFF on the basis of a deviation between a current value of the current detected by the current detector and a target current value.

主权项

1. A motor control apparatus comprising:
an inverter circuit comprising:
a plurality of pairs of upper and lower arms provided so as to correspond to the number of phases, andswitching elements provided on each of the upper arms and the lower arms of each phase that drive a motor on the basis of ON or OFF operations of the respective switching elements; a single current detector that detects a current of the motor flowing through the inverter circuit; a duty calculator that calculates duties of a PWM signals for turning the switching elements ON or OFF on the basis of a deviation between a current value of the current detected by the current detector and a target current value; a PWM signal generator that generates the PWM signals on the basis of the duties calculated by the duty calculator, and outputs the corresponding PWM signals to the respective switching elements; a phase shifting unit that compares the magnitude of the duties calculated by the duty calculator and shift the phases of the PWM signals of the predetermined phases on the basis of a result of comparison; and a phase state maintaining unit that maintains the state of phase shift generated by the phase shifting unit, wherein the phase state maintaining unit maintains the state of phase shift generated by the phase shifting unit when the duties of all the phases calculated by the duty calculator is continuously 50%.