A New Torque Sharing Function for Multi-Stage Switched Reluctance Motors using a Step-Skewed Rotor

This paper proposes a new torque sharing function for a multi-stage switched reluctance motor using a step-skewed rotor. The operational point to decide the sharing torque of each stack is moved on the inscribed circle of the triangle at constant speed. The reference torque of each stack can be calculated from the coordinates of the operational point. The reference current profiles have no overlapped period. The more effective torque ripple reduction can be realized.

I. Introduction

Switched reluctance motors (SRMs) have salient poles in both stator and rotor, and a winding is put on each stator salient pole. The simple motor construction produces some merits, which are lower manufacturing cost, no copper loss in the rotor, lower inertia, the largest instantaneous torque generation compared with other same-sized motors, and so on.