CONTROL METHOD, APPARATUS AND SYSTEM FOR PULSE WIDTH MODULATION OF DIRECT CURRENT BRUSHLESS ELECTRICAL MOTOR

摘要

A control method, apparatus and system for pulse width modulation of a direct current brushless electrical motor. The method comprises: acquiring a pulse width modulation (PWM) high-accuracy duty ratio value (101); determining an accuracy extension mode of a PWM signal according to the PWM high-accuracy duty ratio value, wherein the accuracy extension mode comprises an accuracy extension period and an accuracy extension output sequence (102); and within the accuracy extension period, modulating a low-accuracy PWM signal according to the accuracy extension output sequence and outputting a control signal (103). The control method can weaken a speed staircase effect under open-loop control, and reduce a steady state speed error of closed-loop control.