基于复合控制电流的开关磁阻电机恒转矩控制

Constant Torque Control for Switched Reluctance Motor Based on Composite Control Current

开关磁阻电机(SRM)在低速运行时,高转矩脉动极大限制了在生产中的应用。针对基于线性电感模型转矩分配函数(TSF)控制得到的线性控制电流,难以有效控制强非线性特性SRM,所导致的转矩脉动较大的问题,文章提出基于回声状态网络(ESN)的电流控制策略,针对SRM非线性特性,设计实时得到由动态电感引起的非线性部分电流的控制器,其输出与TSF控制器的线性控制电流叠加得到复合控制电流,两个电流控制共同作用,提高系统动态性能,有效抑制转矩脉动。仿真结果验证了所提出的控制策略可以有效减小电机的转矩脉动。

Sw itched reluctance motor exists high torque ripple at low speed,w hich greatly limits its application in the production. The linear control current is obtained by TSF controller based on linear inductance model is hard to effectively restrain the torque ripple that led by SRM w ith strongly nonlinearity characteristics. A current control scheme based on echo state netw ork( ESN) is proposed to solve torque ripple. A current controller is designed for obtaining nonlinear current in real-time w hich is caused by dynamic inductance to solve nonlinearity characteristic of SRM. The composite control current is obtained by superimposing the nonlinear output current of ESN current controller to linear control current of TSF controller. Tw o currents w orking together can improve the dynamic performance of the system and restrain the torque ripple effectively. Simulation results verify that the proposed control strategy in this paper can effectively reduce torque ripple of the motor.