Principles and Analysis of a Novel Switched Reluctance Motor with Radial Offset Angle

Abstract

Due to the double salient pole structure and the pulse discontinuous current excitation mode, the torque ripple of the traditional switched reluctance motor (SRM) is large in its commutation process and is easy to cause vibration and noise, which has become a bottleneck problem hindering its development. Based on the in-depth analysis of the influence of winding inductance and other factors on torque ripple, a novel switched reluctance motor with radial offset angle is proposed here. Its structural characteristics and operating principles are described, and winding excitation rules are designed. The motor has an inner stator and an outer stator which are radially staggered at a certain angle. Each inner stator pole is wound with an auxiliary winding, which is responsible for providing auxiliary torque to compensate for the torque drop during the commutation of main windings, so as to achieve the purpose of restraining torque ripple. The magnetic field characteristics are verified by finite element simulation. Based on the field-circuit joint simulation of Maxwell and Simplorer, the current chopping control system of the novel switched reluctance motor is constructed, and the simulation results show that after the auxiliary windings are put into use, the torque ripple coefficient of the motor can decrease from 1.326 to 0.494, and the torque ripple suppression effect is obvious.