单斩调制方式对无刷直流电动机换向转矩脉动的影响

针对无刷直流电动机的四种单斩PWM调制方式，建立换向过程中电机相电流及电磁转矩的数学模型，研究换向转矩脉动与PWM调制方式的关系。依据无刷直流电动机换向过程的理论分析结果建立仿真模型，比较四种单斩PWM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。仿真结果表明采用pwm_on调制方式同时进行PWM脉宽补偿可显著减小换向转矩脉动。

Influence on Commutation Torque Ripples of Brushless DC Motor Based on Single Chop Modes

Based on four single chop PWM modes used in brushless DC motor (BLDCM) 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. The BLDCM modules are presented which used for comparing the different influences of four single chop PWM modes on the commutation torque ripples. In order to decrease commutation torque ripples,a utility compensation method is introduced,and the simulation shows that it can get good torque performance.