Power Density Optimization Through Optimal Selection of PM properties in a PM-SyncRM Using FEM Analysis

Recent developments in electrical machine industries have made investigators to explore new topologies of electrical machines including Synchronous Reluctance Machine (SyncRM). However, Permanent Magnet Assisted Synchronous Reluctance Machine (PMSyncRM or PMASyncRM) which is originated from SyncRM and PMs are inserted in flux barriers of rotor is also introduced for improving the magnetic performance of SyncRM. Thus, the amount, magnetic direction and material of PM segments should be optimized based on the operational requirement. In order to enhance power density of the machine, 2D Finite Element Method (FEM) is applied to six PM layouts considering three different types of PM materials in two magnetic directions and results are presented in this paper. Based on the results PM-SyncRM with two NdFeB PMs per pole aligned with flux direction in rotor shows the overall enhancement in power (torque) density and torque ripple reduction.