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 a 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 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 a 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 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 a plurality of PWM signals corresponding to a plurality of PWM cycles for respective phases within one control cycle comprising the plurality of PWM cycles on the basis of the duties calculated by the duty calculator, and outputs the PWM signals to the switching elements respectively; and a phase shift unit that shifts the phases of the PWM signals generated by the PWM signal generator gradually within one control cycle, wherein the PWM signal generator generates and outputs PWM signals comprising calculated duties after the duty calculator calculates the duties of the PWM signals in the respective phases before the phase shift unit starts phase shifting.