无刷直流电机换向转矩脉动分析与抑制

针对无刷直流电机的单斩PWM的4种调制方式，建立了换向过程中电机相电流及电磁转矩的数学模型，研究了换向转矩脉动与PWM调制方式的关系。基于Matlab的仿真模型，分析并比较各种调制方式对换向转矩脉动的不同影响，提出了在换相时加补偿电流可有效抑制换向转矩脉动的实现方法，指出pwm_on单斩调制方式下电机具有较小的换向转矩脉动，电流补偿可使转矩脉动的幅值减小57．1％。

Analysis and attenuation on commutation torque ripples of brushless DC motor

Based on four single chop PWM modes used in BLDCM(brushless DC motor) control system,the mathematic models of phase current and electromagnetic torque in course of commutation are derived.The relation between commutation torque ripples and PWM modes are discussed.Based on Matlab BLDCM modules,the different influences of PWM modes on the commutation torque ripples are analyzed.In order to minimizing commutation torque ripples,a utility compensation method is introduced,the simulation shows that the pwm_-on PWM mode is the best for minimum torque ripples and it can get good torque performance,57.1 percent of the torque ripples can be decreased by the compensation method of electric current.