一种降低无刷直流电机非导通相续流的PWM调制方式研究  

A PWM Modulation Method for Reducing the Non-conduction Phase Freewheeling of Brushless DC Motor

作　　者：寇元超 郗珂庆 王志业 龚晓宏 KOU Yuanchao;XI Keqing;WANG Zhiye;GONG Xiaohong(Xi’an Aerospace Propulsion Testing Technology Research Institute,Xi’an 710025,China)

机构地区：[1]西安航天动力测控技术研究所,西安710025

出　　处：《微电机》2020年第12期78-82,共5页Micromotors

摘　　要：无刷直流电机转矩波动会影响电机运行平稳性,降低系统效率,产生噪声。本文针对非换相期间转矩波动进行分析,重点研究了PWM调制造成的转矩波动。当逆变器的开关管处于关断时,非导通相的续流是造成非换相期间转矩波动的主要因素。经过理论推导,证明了当控制系统采用PWM-ON-PWM调制方式时,非导通相续流可被完全消除。通过Simulink仿真及实验验证了该方法可完全消除非导通相续流,降低转矩波动。The torque fluctuation of the brushless DC motor will affect the stability of the motor operation,reduce the system efficiency,and generate noise.This paper analyzed the torque ripple during non-commutation and focuses on the torque ripple caused by PWM modulation.When the switch tube of the inverter is off,the freewheeling of the non-conducting phase is the main factor that causes torque fluctuation during the non-commutation phase.After theoretical derivation,it is proved that when the control system adopts PWM-ON-PWM modulation mode,the non-conducting phase freewheel can be completely eliminated.It is verified by Simulink simulation and experiment that this method can completely eliminate non-conducting phase freewheeling and reduce torque ripple.

关 键 词：无刷直流电机 转矩波动 非导通相续流 PWM-ON-PWM调制 

分 类 号：TM361[电气工程—电机] TP272[自动化与计算机技术—检测技术与自动化装置]