Working principle of brushless doubly-fed machine and characteristics of different kinds of rotor structures were introduced, and brushless doubly-fed machines with four kinds of rotor structures were modeled and simulated by Ansoft software including reluctance rotor, cage rotor, salient poles rotor and salient poles rotor with bars. The results of distribution of magnetic force lines and frequency spectrum of air-gap magnetic field harmonic of the brushless doubly-fed machines were gotten through 2D transient electromagnetic field finite element, which indicate effects of rotor structures on magnetic field modulation of brushless doubly-fed machines. The final conclusion was the reluctance rotor has the best effect on magnetic field modulation and the cage rotor has the worst effect, which provides foundation for optimal design of rotor structure of brushless doubly-fed machine.%阐述了无刷双馈电动机的工作原理和不同转子结构特点,采用Ansoft软件对磁障、笼型、凸极、凸极加导条4种不同转子结构的无刷双馈电动机进行了建模仿真,通过二维瞬态电磁场有限元计算出了不同转子结构无刷双馈电动机的磁力线分布及气隙磁场谐波的频谱图,揭示了不同转子结构对无刷双馈电动机磁场调制效果的影响,得出磁障转子无刷双馈电动机对磁场的调制效果最好、笼型转子无刷双馈电动机对磁场的调制效果最差的结论,为深入研究无刷双馈电动机转子结构的优化设计奠定了基础.
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