异步起动永磁同步电动机电磁振动特性及抑制措施的研究

Study of Characteristics and Suppression Methods of Electromagnetic Vibration in Line-start Permanent Magnet Synchronous Motor

现有关于永磁电机电磁振动的研究主要围绕单边开槽永磁电机展开,而异步起动永磁同步电动机的定转子双边开槽、永磁体内置于转子铁心内部,导致其电磁振动特性及抑制措施的研究难度大幅增加。本文针对异步起动永磁同步电动机的负载运行,提出了一种新的电磁力解析分析方法,建立了不同阶数、频率的电磁力与电机定转子齿槽参数之间的明晰关系。利用机械阻抗法计算了电机主要低阶电磁力的电磁振动响应,并得到了对电机电磁振动起主要作用的低阶电磁力的频率。进一步研究了通过改变定子齿宽抑制上述主要电磁力,并得到了相应的定子齿宽确定方法,利用有限元法验证了上述抑制措施的有效性。

The existing research on electromagnetic vibration of permanent magnet motors mainly focuses on single-side slotted permanent magnet motors.While the research on electromagnetic vibration characteristics and suppression methods of line-start permanent magnet synchronous motors(LSPMSM)is very difficult,because of the stator and rotor slots as well as the interior permanent magnets.In this paper,a new analytical analysis method of electromagnetic force was proposed when LSPMSM operates under load.This method can clearly establish the relationship between the electromagnetic forces of different orders and frequencies and the parameters of the teeth and slots of stator and rotor.The mechanical impedance method was used to calculate the electromagnetic vibration response of the main low-order electromagnetic force of the motor,and the frequency of the low-order electromagnetic force which played a major role in the electromagnetic vibration of the motor was obtained.Furthermore,the above electromagnetic force was suppressed by changing the teeth width of stator,and the corresponding method to determine the teeth width of stator was obtained.The finite element method was used to verify the effectiveness of the above suppression method.