目的目的永磁同步电动机在变频供电下运行时,转子偏心将加剧电动机的电磁振动,并加大电动机电磁力特性的分析难度。为了研究永磁同步电动机转子偏心时的电磁力特性,方法方法提出一种快速电磁力特性解析分析方法,在建立电动机永磁体磁动势、定子绕组基波及谐波磁动势、气隙磁导函数的解析模型的基础上,构建电动机无偏心、静态偏心、动态偏心时径向电磁力的解析分析模型,并研究电动机电磁力的阶数成分、频率成分特征。结果结果经分析发现,与电动机不偏心时电磁力的阶数r和频率成分fk相比,电动机静态偏心、动态偏心时均会增加阶数为r±1和r±2的电磁力;电动机静态偏心时,新出现的电磁力的频率成分为fk;电动机动态偏心时,新出现的电磁力的频率成分为fk±f1/p,fk±2f1/p。搭建电动机本体和矢量控制电路结合的联合仿真模型,该模型能够反映电动机不同运行状态下绕组电感、永磁体磁链等参数的变化,利用该模型分别仿真分析电动机无偏心、静态偏心和动态偏心带载运行时径向电磁力的阶数成分、频率成分。仿真分析结果与解析分析结果相符,验证了本文解析分析方法的正确性。结论结论研究结果可为电磁振动的削弱、电动机故障的预测与诊断提供理论依据。

Objectives When the permanent magnet synchronous motor(PMSM) operates under variable fre⁃quency power supply,rotor eccentricity will exacerbate the electromagnetic vibration of the motor and in⁃crease the difficulty of analyzing the electromagnetic force characteristics of the motor.In order to study the electromagnetic force characteristics of PMSM with rotor eccentricity, Methods a fast analytical method for electromagnetic force characteristics was proposed.Based on the establishment of analytical models for per⁃manent magnet magnetic force,stator winding fundamental and harmonic magnetic forces,and air gap mag⁃netic permeability function of the motor,the analytical models for radial electromagnetic force were con⁃structed for motors without eccentricity,with static eccentricity and dynamic eccentricity,and the order and frequency components of the electromagnetic force were studied. Results Through analysis,it was found that compared to the order r and its frequency component f of the electromagnetic force when the motor was not eccentric,both static and dynamic eccentricities of the motor increased the electromagnetic force with or⁃ders r±1 and r±2.When the motor was statically eccentric,the frequency component of the newly emerging electromagnetic force was f. When the motor was dynamically eccentric,the frequency components of the newly emerging electromagnetic force were f±f/p,f±2f/p.In addition,a joint simulation model combining the motor and vector control circuit was established,which could reflect the changes in parameters such as winding inductance and permanent magnet magnetic flux of the motor under different operating states.The model was used to simulate and analyze the order and frequency components of radial electromagnetic force when the motor operated under load without eccentricity,with static eccentricity and dynamic eccentricity.The simulation analysis results were consistent with the analytical analysis results,verifying the correctness of the theoretical analysis in this paper. Conclusions The research results in the paper could provide theo⁃retical basis for the suppression of electromagnetic vibration and the prediction and diagnosis of motor faults.