Variation polarity control strategy for six-phase SRM with different winding topologies

This paper proposes a novel polarity variation control strategy for six-phase switched reluctance motors (SRMs). The magnetic pole distribution characteristics under three-phase conduction are analyzed, revealing that an NSN pole arrangement yields higher starting torque. Comparative analysis of winding topologies demonstrates that only a reverse-series winding with alternating NS poles can produce a three-phase NSN configuration. However, this winding configuration exhibits significant inter-phase coupling, resulting in compromised fault tolerance. The proposed control strategy enables a forward-series connection with alternating NS pole arrangement, which ensures phase decoupling while enhancing fault tolerance and output performance. Simulation and experimental results demonstrate that this control method enhances the symmetry of phase currents, increases torque output, and reduces torque ripple.