Design and Analysis of A Novel Hybrid Permanent-Magnet Machine with Less Rare Earth Materials

This article proposed a novel hybrid permanent magnet machine (HPMM) with less rare earth material and offset interior permanent magnet (IPM) that designs location and dimension of permanent magnet for torque density enhancement and torque pulsating suppression. The conventional HPMM-I and the proposed HPMM-II are designed and optimized based on the finite-element method (FEM). The effect of permanent magnet dimensions and offset angle on the proposed HPMM-I machine is investigated with emphasis on average output torque and torque ripple. The electromagnetic performances of two optimal machines are compared, and the proposed HPMM-II has significant advantages in torque characteristics and efficiency.