抑制无刷直流电机转矩脉动的新型PWM策略  

A Novel PWM Algorithm for Suppressing the Commutation Torque Ripple of Brushless DC Motor

作　　者：简献忠[1] 钱双杰 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《控制工程》2016年第8期1172-1177,共6页Control Engineering of China

基　　金：国家自然科学基金(41075019)

摘　　要：针对电机换相时转矩脉动过大的问题,提出一种新颖的PWM策略。换相时,改变相关功率管调制序列,由两两导通方式变为三管调制,同时确定最佳PWM占空比,结合电机数学模型,分析了这种PWM方式抑制转矩脉动的原理。同时提出通过定子端电压和PWM电平来确定续流时间,该方法不需要检测定子电流,不依赖电机参数,避免了参数敏感性对续流时间的影响。同时不区分高速还是低速,具有更好的普适性。仿真实验表明,与传统ON-PWM法相比,所提出PWM策略无论在低速还是高速,都能准确确定电机续流时间,快速抑制转矩脉动,提高了无刷直流电机控制性能。In order to minimize the commutation torque ripple, a novel PWM modulation strategy is proposed. At the commutation stage, the modulation sequence of related power tubes will be changed from the two-conduction mode into the three-tube conduction, and the optimal PWM duty cycle will be calculated. According to the mathematical model of the motor, the principle of PWM is analysed. At the same time, a novel method to determine the commutation time is put forward. The commutation time is determined by detecting the stator terminal voltage. The method does not need to detect the stator current or rely on motor parameters, avoiding the influence of parameter sensitivity. In addition, this method will have a better universality without distinguishing high speed range from low speed range. Simulation results show that compared with the traditional ON-PWM modulation, the proposed PWM strategy can accurately determine the flow-continued time both in low speed and high speed and restrain the torque ripple quickly, which has good dynamic response and improves the performance of the brushless DC motor control system.

关 键 词：无刷直流电机 PWM调制策略 换相转矩脉动抑制 换相时间整定 

分 类 号：TM33[电气工程—电机]