环形绕组无刷直流电机的混合换向方法

Hybrid Commutation Method of Circular Winding Brushless DC Motor

环形绕组无刷直流电机(CWBLDCM)是一种新型的多相非正弦永磁电机,其转矩性能与绕组电流换向过程密切相关。该文提出了一种利用绕组自身反电动势和母线电压来改善电机转矩性能的混合换向方法,该方法有两个换向控制参数(β,γ),随着控制参数的变化,换向过程可能呈现出四种典型的换向状态。首先对各换向状态进行了分析、仿真和实验验证;然后比较了不同换向状态下的转矩性能;最后根据比较结果,提出了一种针对CWBLDC电机转矩性能的优化控制策略。

Circular winding brushless DC motor(CWBLDCM)is a novel non-sinusoidal multiphase permanent-magnet one whose torque performance is closely related to the commutation of current.This paper proposes a hybrid commutation method,in which both the back-EMF and the DC-bus voltage are exploited to improve the torque performance.With the variation of two commutation parameters,βandγ,the hybrid commutation process can be classified into four typical states.Firstly,all commutation states are analyzed,simulated,and then verified by experiment.Then,the torque performance under different commutation states is compared.Finally,according to the comparison result,an optimized control strategy is recommended for the CWBLDC motor.