BLDC控制系统中PWM调制方式分析与比较

1、Vol. 19 No. 1Jan. 2016第19卷第1期2016年1月西安文理学院学报(自然科学版)Journal of Xian University ( Natural Science Edition)文章编号：1008-5564(2016)01 -0036-05BLDC控制系统中PWM调制方式分析与比较史召峰-孙承厘2(1安緻工业经济职业技术学院 机电工程系合肥230051 ；2.苏州大学 机电工程学院，江苏苏州215021)摘 要:介绍了无刷宜流电机控制系统中的5种PWM调制方式,并从开关损耗、调制方式的极性和 对换向转矩脉动的影响这三个角度来分析和比较了这几种PWM调制方武的优劣通

2、过理论推导，证明 当控制系统采用PWM -ON调制方式六只开关管的开关损耗得到了均匀的分配，并FL直流无刷电机在 换向过程中的转矩脉动最小最后通过实验验证了结论的正确性.关键词：直流无刷电机;PWM调制方式;开关损耗;换向转小脉动 中图分类号:TM351文献标志码：AAnalysis and Comparison of PWM Modulationin Brushless DC (BLDC) Motor Control SystemSHI Zhao-feng1 , SUN Cheng-feng2(1 Department of Electrical and Mec：hanical Engine

3、ering v Anhui Technical College uf Indutiy mid ICcunumy 9 I lefeu230051 . China； 2 School of mechanical and elwtrieal engineering, Soochow University, Suzhou 215021 , China)Abstract: In this paper, five PWM modes used in the brushless DC motor control systems were introduced Their advantages and dis

4、advantages were analyzed and compared from three aspects such as switch loss, the polarity of modulation mode and the influence on the commutation torque ripple of brushless DC motor. Through theoretical derivation, it was proved that when the control system adopted PWM - ON modulation mode, the swi

5、tching loss of six switches was distributed evenly, and the torefue ripple of brushless DC motor in the process of commutation was minimum Finally, the experimental results show that the conclusion is correctKey words:brushless DC motor ( BLDC) ； PWM modulation mode； switch loss； commutation torque ripple具有梯形波反电动势的水磁无刷直流电动机具有高功率密度、控制简单等特点,应用非常广泛其 驱动逆变器多采用三相半桥结构形式，工作于二二导通、三相六状态的120。导通方式，-般采用PWM 调制方式进行速度及电流的调廿，由T BLDCM相电感的存在使电枢绕组电流从一相切换到另一相时, 产生换相延时，形成电机换向过程中的转矩脉动一。当采用的PWM调制方式不同时，对系统的影响收稿日期：2015916基金项目：安徽