开关磁阻电动机转矩分配策略研究

Torque Control in Switched Reluctance Motor Using a Torque Allocation Function

开关磁阻电机是一种双凸极变磁阻电机,按照磁阻最小原理进行工作。电机运行时磁路具有严重非线性,致使电机换相时电磁转矩具有很强的波动性,影响了伺服控制系统的运行精度,因此必须对电机的转矩脉动进行抑制。设计了一种新型转矩分配控制函数,在不同的给定转矩下,通过改变分配函数中的波形系数来改变每相绕组的转矩分配指令,使实际转矩较好地跟踪给定转矩,从而抑制电机运行时的转矩脉动。实验表明,该转矩分配控制函数能对不同转矩指令下转矩脉动进行有效抑制,控制效果得到明显改善。

The switched reluctance motor is a double-salient pole and variable reluctance motor, according with the principle of reluctance minimum to work. Magnetic circuit of running SRM has a serious non-linear, resulting in a strong volatility of electromagnetic torque when motor switching its phase. This caused a serious impact on the accuracy of the operation of the servo system, so it is necessary to suppress the torque ripple of the motor. A new torque allocation function was proposed in this paper. The torque ripple of running motor was suppressed by the torque allocation command according to the waveform coefficient which was calculated at different forms of torque value. The actual torque will track given torque better. Experiments show that the torque ripple was suppressed effectively with proposed torque allocation method, and the control effect was improved well.