A Current Control Method with Two-step Prediction for Torque Ripple Minimization in Switched Reluctance Motor Drive System

The doubly salient stator and rotor structure of switched reluctance motor (SRM) results in high torque ripple. This drawback limits its application with high performance requirements. Thus, a novel current two-step prediction control method is presented. This novel current control method is used as the inner current control loop of torque sharing function (TSF) to suppress torque ripple. The novel current control method can predict the phase current and the rotor position at the end of the current switching period accurately by the first step prediction, so as to eliminate one-beat sampling delay and improve the accuracy of current sampling. The second step is to predict the optimal duty cycle accurately for the next switching period. Through the two-step prediction, the current tracking error and torque ripple are reduced significantly.