关键词: 内置式永磁同步电机, 电磁噪声, 轴向电磁力, 转子分段斜极, 有限元仿真

Abstract: This article designed an interior permanent synchronous motor for passenger vehicles. The rotor structure was optimized to solve the problem of excessive axial force of linear step-skewed rotor. The axial electromagnetic force is offset and the electromagnetic noise is weakened by changing the direction and sequence of the rotor skew pole. The finite element method was used to compare electromagnetic noise and axial electromagnetic force of V-shaped step-skew rotor, antisymmetric step-skew rotor and linear step-skew rotor. The results showed that the near field noise of V-shaped step-skew and antisymmetric step-skew was reduced by 7. 65% and 12. 7% compared with that of linear step-skew, and the average axial force was reduced by 99. 16% and 96. 8%. The axial force of V-shaped step-skew rotor was smaller, the electromagnetic noise of anti-symmetric step-skew rotor was lower. A power 20 kW prototype was made for noise testing to verify the noise reduction effect before and after optimization.

Key words: interior permanent magnet synchronous motor, electromagnetic noise, axial electromagnetic force, rotor step-skew, finite element simulation