Effects of Mechanical Offset Between Inner and Outer Stators in a Double Stator Switched Reluctance Machine

High motional force density is a characteristic of the double stator switched reluctance motor (DSSRM) when compared to conventional switched reluctance motors (SRM). Amid this major accomplishment that places DSSRM in par with interior permanent magnet synchronous machines in terms of torque and power density, it still suffers from higher levels of torque pulsation. To substantially reduce torque pulsation in DSSRM without penalizing the average torque the inner and outer stators have been optimally misaligned. This process has been applied to a four phase 8/6/8 DSSRM through detailed finite element analysis (FEA) and experimental verification. By considering the operation under unsaturated and saturated conditions, it has been proven that tangible reduction in torque pulsation with minimal impact on average torque can be achieved.