不同转子结构无刷双馈电机的运行特性对比

Comparasion on the performance of brushless doubly-fed machine with different rotor structures

在阐述无刷双馈电机(BDFM)不同转子结构特点的基础上,针对无公共笼条、带公共笼条、带公共笼条公共端环、笼条加磁障、凸极加笼条、ALA磁阻等6种不同转子结构的BDFM,进行了二维瞬态电磁场有限元计算,通过气隙磁场谐波的频谱分析,比较了不同转子结构对BDFM磁场调制效果的影响。研究了不同转子结构BDFM在单馈异步运行以及双馈同步、亚同步和超同步运行时的转矩与转速动态特性。探讨了在控制绕组频率一定的情况下,控制绕组电压大小对转矩和转速稳定性的影响。通过与相关文献的对比,验证了结果的正确性。研究结果揭示了不同转子结构对BDFM磁场调制效果和动态特性的影响,为BDFM的转子结构优化设计和运行稳定性的深入研究奠定了基础。

By introducing 6 different kinds of rotor structures, which include the cage rotor with or without common bars, the cage rotor with common bars and common end ring, the cage rotor with reluctance and common bars, the salient poles rotor with cage bars, the ALA reluctance rotor, the 2-D transient electromagnetic fields of brushless doubly-fed machine （BDFM） were calculated by finite element method. The air-gap magnetic fields were compared by the harmonic spectrum analysis, and then the magnetic field modulation effects of BDFMs with 6 different rotor structures were discussed. The torque and speed dynmnic characteristics of the different BDFMs were researched under the states of single-fed asynchronous operation and doubly-fed syn- chronous, under-synchronous and over-synchronous operations. The effects of control winding voltage value with a constant frequency on the torque and speed stability were simulated and discussed. The relative characteristics were verified by comparing with other literatures. The results indicate the effects of rotor structues on magnetic field modulation and dynamic characteristics of BDFM, and provide the foundation for the rotor structure design optimization and operating stability intensive research of BDFM.