不同PWM调制方式下无刷直流电动机非导通相续流分析

摘要

基于无刷直流电动机的数学模型,对在不同PWM调制方式下非导通相的续流过程进行了分析,指出非换相期间使用传统的PWM调制方法会在直流无刷电机中引起非导通相的续流现象,而使用H_PWM-L_PWM调制方法不会引起非导通相的续流现象.最后通过实验验证了结论的正确性.%The process of the diode freewheeling of the inactive phase was analyzed in detail on the base of brushless DC motor model.It is shown that using traditional PWM modes will cause the phenomenon of the diode freewheeling of the inactive phase in non-commutation region,but the H_PWM-L_PWM mode will not.The experimental results prove the correctness of the conclusion.