Abstract
The cogging torque of a permanent magnet synchronous motor (PMSM) using an ring type permanent magnet (PM) can effectively reduce the cogging torque by skew magnetization of the PM. In previous studies on skew magnetization to reduce cogging torque use the assumption that the same cogging torque occurs at all points in the stack length direction. However, in this paper, it was found that the value of the cogging torque generated in the motor is different for each position in the stack length direction due to the 3D end effect. From this, it was revealed that the existing 2D FEA could not accurately calculate the cogging torque according to the skew magnetization angle. In order to accurately calculate the cogging torque according to the skew magnetization, a 3D FEA that can take into account the 3D end effect is essential. In this paper, the effect of the 3D end effect on the cogging torque characteristics according to the skew magnetization angle of the PM motor was analyzed through a comparison of 2D FEA and 3D FEA analysis.
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