Design and Optimization of a Less-Rare Earth Permanent Magnet Brushless Motor Considering Cost Effective

Abstract

This paper proposes a new less rare earth permanent magnet motor (LREPMM) with hybrid ferrite PMs and rare earth PMs. The special superiority of the motor is the utilization of low priced nonrare earth PMs and the artfully combination of two kinds of PMs. In accordance with the concept of the reduction of the rare earth permanent magnet materials, the design and optimization of the motor are investigated based on the finite-element method (FEM) analysis. Moreover, in order to verify the validity of the motor, a conventional rare earth permanent magnet motor (REPMM) with identical stator is introduced, and the compares between the two motors are investigated. The results not only shows the low cost characteristics of the motor, but also shows that the LREPMM features the competitive torque performances, including preferable output torque, cogging torque, and good anti-demagnetization capacity.