一种用于抑制无刷直流电机电流波动的PWM调制方式  

A PWM Modulation Method Used to Suppress Current Fluctuation of Brushless DC Motor

作　　者：边春元[1] 贾玉龙 邢海洋 刘尚玥 BIAN Chun-yuan;JIA Yu-long;XING Hai-yang;LIU Shang-yue(School of Information Science&Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2021年第3期317-324,共8页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(61773006).

摘　　要：针对无刷直流电机在传统半桥调制方式下电流波动问题,提出一种改进型PWM调制策略.首先,对传统H_OFF-L_PWM调制方式进行了详细的分析.其次,为减小H_OFF-L_PWM调制方式下的电流波动,提出了一种改进型H_OFF-L_PWM调制策略.该调制策略通过对非续流区间非导通相的下桥臂开关管进行PWM斩波控制,使得电机电流更加平滑,从而进一步减小电机转矩脉动.最后,在PLECS仿真平台上搭建了无刷直流电机回馈发电系统仿真模型.基于TMS320F280049CPZS控制芯片,搭建了无刷直流电机回馈发电系统实验平台.仿真和实验结果表明,所提出的改进型H_OFF-L_PWM调制策略能够抑制电机相电流波动,从而抑制电机电磁转矩脉动.In order to solve the current fluctuation problem of the brushless DC motor in the traditional half-bridge modulation mode,an improved PWM modulation strategy was proposed.First,the traditional H_OFF-L_PWM modulation method was analyzed in detail.Second,in order to reduce the current fluctuation in the H_OFF-L_PWM modulation mode,an improved H_OFF-L_PWM modulation strategy was proposed.This modulation strategy performs PWM chopping control on the switch tube of the lower bridge arm of the non-conduction phase in the non-freewheeling interval,so that the motor current is smoother,thereby further reducing the motor torque ripple.Finally,a simulation model of the brushless DC motor feedback power generation system was built on the PLECS simulation platform.Based on the TMS320F280049CPZS control chip,an experimental platform for the brushless DC motor feedback power generation system was built.Simulation and experimental results show that the proposed improved H_OFF-L_PWM modulation strategy can suppress the motor phase current fluctuations,thereby suppress the motor electromagnetic torque ripple.

关 键 词：无刷直流电机 回馈发电 改进型H_OFF-L_PWM 非导通相续流 电流波动 

分 类 号：TM315[电气工程—电机]