A New Topology of Multilayer Interior Permanent Magnet Synchronous Motor with Reduced Rare Earth Magnets

Interior permanent magnet synchronous motor is a popular alternative in the EV industry due to its high power density, high efficiency, and high torque-to-weight ratio. Among the different arrangements of magnets, the V-shaped configuration has attained maximum attention among researchers and the industry. However, compared to a V-shape permanent magnet synchronous motor, the multi-layer and multi-segment topology has definite merits in terms of speed range of operation and reduction in cogging torque. However, majority of these topologies employ only rare-earth magnets. In this work, a cost-effective multi-layer and multi-segment rotor topology have been proposed. Different winding configurations have been investigated. Simulation results as obtained from the 2D FEM environment have been presented. A simplified study of the overall cost of the magnet has also been reported.