转子分段斜极对永磁同步电机电磁噪声的削弱影响

为了削弱由齿谐波引起的电磁力谐波从而有效抑制电机的电磁噪声，推导转子分段斜极的径向电磁力波的解析式，分析分段斜极对永磁同步电机电磁噪声的抑制机理，讨论不同斜极分段数与削弱的齿谐波阶次之间的关系. 基于MANATEE仿真平台，对48槽8极永磁同步电机进行不同斜极分段数下的径向电磁力波和电磁噪声仿真分析，得到斜极分段前后主要阶次的径向电磁力谐波在不同斜极分段数下的变化规律，分析分段斜极对电磁噪声的影响. 研究结果表明：当齿谐波阶次为分段数的整数倍时，转子斜极无法削弱该阶齿谐波；当为非整数倍时，该阶次的齿谐波可以得到有效抑制，电磁噪声明显下降. 样机的实测噪声与仿真结果基本吻合，验证了转子分段斜极降低电机噪声的机理及仿真分析的正确性.

Electromagnetic noise reduction of permanent magnet synchronous motor by step-skewed rotor

In order to weaken the electromagnetic force harmonics caused by the tooth harmonics and effectively suppress the electromagnetic noise of the motor, the analytical formula of radial electromagnetic force wave of step-skew was derived, the mechanism of step-skew suppressing the electromagnetic noise of permanent magnet synchronous motor was analyzed, and the relationship between different segments of step-skew and the order of weakened tooth harmonics was discussed. The radial electromagnetic force wave and electromagnetic noise of a 48-slot 8-pole permanent magnet synchronous motor with different segments of step-skew were simulated and analyzed based on MANATEE simulation platform. The variation of electromagnetic force harmonics with and without step-skew was obtained, and the influence of the step-skew on electromagnetic noise was further analyzed. Results show that when the order of tooth harmonics is integral multiple of segments of step-skew, step-skew cannot weaken the order of tooth harmonics. When the order of tooth harmonics is non-integral multiple of segments, the tooth harmonics and the electromagnetic noise can be effectively suppressed. The measured noise values of the prototype were in good agreement with the simulation results, which verified the mechanism of step-skew suppressing electromagnetic noise of motor and the correctness of the simulation analysis.