Effect of Magnetization on High-Speed Permanent Magnet Synchronous Motor Design

This paper presents the influence of permanent magnet (PM) magnetization effect on high speed PM synchronous motor design and performances. Different PM magnetization fields applied to the electromagnetic field system of the motor are analyzed and their effects to the motor performances are investigated. Field-circuit-motion coupled Time-stepping finite element method is used to evaluate the effect of different PM magnetization fields to the nonlinear electromagnetic field system of the motor. Results show that magnetization orientation of the permanent magnet directly affects the motor efficiency, vibration and torque generation. Preliminary investigation of the effect of PM excitation is vital to optimize the motor performances and to identify proper driver circuit and control scheme.