Electromagnetic Design of a Six-Phase Low-Inertia Fault-Tolerant Permanent Magnet Synchronous Machine

Multiphase permanent magnet (PM) synchronous machine features the advantages of high reliability and high fault-tolerant capability, which has great potential in the fields like aviation servo and electric vehicles. In order to meet the design criteria of low moment of inertia and high post-fault torque performance, three different rotor structures are analyzed and compared for a low-inertia fault-tolerant permanent magnet synchronous machine(SLIFT-PMSM) by finite-element method. The influence of winding structure on torque performance is investigated, and the winding structure is optimized to improve the post-fault torque performance. The electromagnetic performance of the improved scheme is evaluated under both the normal and fault conditions.