基于准Z源网络的永磁无刷直流电机换相转矩脉动抑制方法  

Researches on the Method of Suppressing Commutation Torque Ripple for Brushless DC Motors Based on a Quasi-Z-Source Net

作　　者：夏鲲[1] 朱琳玲[1] 曾彦能 徐鑫悦[1] 杨益华[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海市杨浦区200093

出　　处：《中国电机工程学报》2015年第4期971-978,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51207091/E070303)~~

摘　　要：针对方波驱动的无刷直流电机普遍存在的换相转矩脉动较大的问题,提出了一种基于准Z源网络抑制永磁无刷直流电机换相转矩脉动的方法。在三相桥臂前级增加准Z源网络,换相期间由准Z源网络调整直流母线电压,使电机关断相电流下降速率与开通相电流上升速率相等,从而有效抑制换相转矩脉动。分析了换相转矩脉动产生的原因,详细介绍了通过增加前级功率变换电路抑制换相转矩脉动的电路拓扑与控制算法。仿真及实验结果表明,该方法能够有效抑制永磁无刷直流电机换相转矩脉动,如采用合适的电路参数,仿真模型中转矩脉动可减少到平均转矩的4.6%以下,实际设计的系统实验可将转矩脉动抑制在平均转矩的12%以下。Focusing on popular existed high commutation torque ripple of square waves driving brushless DC motors, this paper presented a new method of suppressing commutation torque ripple for brushless DC motors based on a Quasi-Z-Source net. The Quasi-Z-Source net was employed at the front of the three-phase bridge. The control strategy was to adjust the DC link voltage of the motor controller via the Quasi-Z-Source net to keep the incoming and outgoing phase currents changing at the same rate during commutation, hence to effectively suppress commutation torque ripple. The cause of commutation ripple was analyzed. A novel circuit topology and a control algorithm of suppressing commutation torque ripple employed a Quasi-Z-Source net before the inverter was introduced in detail. Finally, simulation and experimental results show that, the proposed method can effectively minimizing commutation torque ripple. Torque ripple can be reduced to below 4.6% of the average torque by using appropriate circuit parameters in a simulation mode. And torque ripple can also be reduced to below 12% of the average torque via experimentation in real situation.

关 键 词：无刷直流电机 转矩脉动 准Z源网络 功率变换电路 

分 类 号：TM344[电气工程—电机]