Optimal design of a V-type consequent-pole motor with shifted PMs for reducing the PM usage and the torque ripple

Abstract

Surface-mounted permanent magnet synchronousmachines (SPMSM) have low field weakening capability. This fact limits the implementation of these machines in high-speed applications. This paper proposes a windingchangeover scheme, which realizes the multi-speed operation of the SPMSM, decreases induced back EMF by 6.33 times, and increases the base speed of the machine by 7.33 times. There are four possible winding configurations, which result in a different amount of back EMF. To verify the proposed scheme, the finite element method (FEM) simulation results are provided.