摘  要：无刷直流电机的转矩脉动是影响其性能的重要因素。该文针对非换相期间的转矩脉动进行了分析，重点研究了PWM_ON调制方式时的转矩脉动。PWM信号为“OFF”时续流引起的转矩脉动占主要部分，非导通相续流在一定程度上可以补偿PWM关断时造成的转矩脉动。同时，提出使用滞环电流控制方法，采用该方法可以抑制非换相期间转矩脉动。通过仿真分析和实验验证了该方法和传统方法的差异，证明了该方法在非换相期间抑制转矩脉动的有效性。
关键词：无刷直流电机；非换相转矩脉动；PWM_ON调制；滞环电流控制；续流

Abstract: Torque ripple is an important factor affecting the performance of Brushless DC motor (BLDCM). In this paper, the non-commutation torque ripple was analyzed, focusing on the torque ripple caused by PWM_ON modulation. The main part of the torque ripple was caused by the PWM_OFF, and the diode freewheeling of inactive phase can compensate the torque ripple to some extent. Meanwhile, hysteresis current control was proposed to suppress the non-commutation torque ripple. The simulation and experiment show the difference between the method and the traditional method, and prove the validity of the method suppressing the torque ripple during non-commutation.
Key words: brushless DC motor (BLDCM); non-commutation torque ripple; PWM_ON modulation; hysteresis current control; freewheeling