针对传统路法在定量分析转子轴向通风孔尺寸对电机性能影响时表现出的狭隘性,以1台400 kW、6 000 V高压异步电动机为例,建立了场-路耦合的二维瞬态电磁场时步有限元模型,分别对不同的转子轴向通风孔尺寸拓扑结构下电机内的电磁场进行了计算,分析了转子轴向通风孔尺寸及拓扑结构对电机内气隙磁密、损耗、径向电磁力等电磁特征量影响的演变规律。以此为基础,探讨了转子轴向通风孔尺寸及拓扑结构对电机起动、运行性能的影响。最后,通过对比电机有限元计算结果与试验结果,验证了计算方法的准确性,为转子轴向通风孔尺寸及拓扑结构的设计和优化提供了理论依据。

Tradational circuit method was limited in quantitative analysis of the effects of rotor axial vent hole size on motor parameters. Based on a highvoltgae (HV) asynchronous motor with output of 400 kW and voltage of 6 000 V, a fieldcircuit coupled timestepping FEM model of 2D transient electromagnetic field was established. With the variation of rotor axial vent hole size and topological structure, the influence on electromagnetic parameters such as airgap flux density,losses, and radial electromagnetic force, was calculated and analyzed. Furthermore, the effect of rotor axial vent hole size and topology structure on starting and operating performance of the motor was also investigated. Finally, by comparing FEM simulation with experimental results, the correctness of this method was verified. A theoretical basis for the design and optimization of rotor axial vent hole size and topological structure was provided.

TM 343