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Influence of magnetization model to the performance of spindle motor

Analysis shows that, the influence of permanent magnet (PM) magnetization model can affect the performance of the spindle motor obviously, especial for the motor with high energy-product PMs. In the paper, different PM magnetization models are analyzed and their effects to the spindle motor performances are investigated. Field-circuit-motion coupled Time-stepping finite element method (FEM) is used to evaluate the effect of different PM magnetization fields with non-linear characteristic. Results discloses that the magnetization orientation of the permanent magnet can affect directly the efficiency and electromagnetic (EM) torque of the motor. Preliminary investigation of the effect of PM excitation is vital to optimize the motor performances, especially in early design stage. All these are important to realize the spindle motor with high efficiency, low acoustic noise, and high power density.