PWM频率对高速无刷直流电动机转矩脉动影响分析  

Analysis of influence of pulse width modulation frequency on torque ripple of high speed brushless DC motor

作　　者：胡怡婷 赵朝会[1] 吉洪智 丁帆 建照阳 HU Yiting;ZHAO Chaohui;JI Hongzhi;DING Fan;JIAN Zhaoyang(School of Electrical Engineering,Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]上海电机学院电气学院

出　　处：《上海电机学院学报》2019年第6期337-344,共8页Journal of Shanghai Dianji University

摘　　要：针对1.2 kW高速无刷直流电动机(BLDCM)在低频脉宽调制(PWM)控制下转矩脉动较大的问题,分析了在新型PWM_ON_PWM调制方式下,高速BLDCM导通区和换相区的转矩与PWM频率的关系。借助Maxwell及Simplorer软件,搭建了单电流闭环高速BLDCM联合控制仿真模型,研究了在10 000 r/min下不同PWM频率对电动机电流、转矩波形的影响,并进行了驱动实验。仿真和实验表明:PWM频率的提高可减小电流脉动,提高电流品质,可有效抑制电动机的转矩脉动,且其抑制效果会在达到某一频率段后趋于稳定。In view of the problem of the large torque ripple in a 1.2 kW high-speed brushless DC motor(BLDCM) under the low frequency pulse width modulation(PWM) control, the relationship between the torques of the high-speed BLDCM conduction zone and the commutation zone and the PWM frequency is analyzed under the new PWM_ON_PWM modulation mode. With the help of the MAXWELL and SIMPLORER softwares, a single-current closed-loop high-speed BLDCM control simulation model is built. The motor current and torque waveforms at different PWM frequencies at 10 000 r/min are studied, and the driven experiments are carried out. The simulation and experiments show that the increase in the PWM frequency can reduce the current ripple, improve the current quality, and effectively suppress the torque ripple of the motor. Moreover, its suppression effect tends to be stable after a certain frequency range is reached.

关 键 词：高速无刷直流电动机 脉冲宽度调制频率 转矩脉动 

分 类 号：TM351[电气工程—电机]