结构优化与直接瞬时转矩控制下的开关磁阻电机转矩脉动抑制

Torque Ripple Suppression in Switched Reluctance Motors under Structural Optimization and Direct Instantaneous Torque Control

绕组换相时的转矩跌落是造成开关磁阻电机转矩脉动大的主要原因之一。针对该问题,本文在分析普通开关磁阻电机转矩脉动成因的基础上,研究了一种结构性优化与直接瞬时转矩控制相结合的转矩脉动抑制方法。通过增设内定子以及辅助绕组,构造一种周向错角开关磁阻电机,由内定子上的辅助绕组提供辅助转矩,以补偿外定子上主绕组在换相期间的转矩跌落。之后设计了直接瞬时转矩控制策略,根据转矩偏差信号以及扇区信号来直接切换功率变换器的工作模式,具有快速响应和转矩精确控制的优点。最后,在场-路耦合联合仿真环境下,搭建该电机六相绕组的直接瞬时转矩控制电路,对比分析了启动、加减速以及增、卸负载三种工况下的转矩特性以及转速特性。仿真结果表明,改进后的电机具有很好的转矩脉动抑制功能,且运行特性良好。

Torque drop during winding commutation is one of the main causes of significant torque ripple in switched reluctance motors.Based on an analysis of the causes of torque ripple in conventional switched reluctance motors,this paper studied a torque ripple suppression method that combined structural optimization with direct instantaneous torque control to address this issue.The method added an internal stator and auxiliary windings,forming a circumferentially staggered switched reluctance motor.The auxiliary windings on the internal stator provided supplementary torque to compensate for the torque drop in the main windings on the external stator during commutation.A direct instantaneous torque control strategy was then designed,which switched the operating mode of the power converter based on torque deviation signals and sector signals,offering fast response and precise torque control.Finally,a field-circuit coupling co-simulation environment was constructed for the six-phase winding of the motor.The torque and speed characteristics were comparatively analyzed under three operating conditions:starting,acceleration/deceleration,and load increase/reduction.The simulation results showed that the improved motor exhibited excellent torque ripple suppression and good operational characteristics.