摘  要：首先简要介绍了无刷双馈电机(BDFM)的结构特点和工作原理，然后利用Ansoft/Maxwell 2D建立凸极转子的BDFM模型，进行了二维瞬态电磁场有限元计算，得出电机磁力线分布、气隙磁通密度波形，对气隙磁通密度波形进行谐波频谱分析。在此基础上，对凸极转子无刷双馈电机的电感参数进行计算，给出了功率绕组和控制绕组电感参数波形。针对互感中的直流分量较大，对极弧系数和节距进行优化设计，通过分析电感参数变化情况，研究这些设计参数的变化对转子耦合能力的影响。研究表明：合适的节距和极弧系数可以减小甚至消除互感中的直流分量，从而可以提高转子的耦合能力。
关键词：无刷双馈电机；Ansoft/Maxwell 2D；极弧系数；凸极转子

Abstract:  The structural characteristics and working principle of brushless doubly-fed machine were introduced firstly in this paper. Then Ansoft/Maxwell was used to establish the models of doubly-fed brushless machine with salient pole rotor. The 2-D transient electromagnetic fields of brushless doubly-fed machine (BDFM) were calculated by finite element method. The magnetic force line and air-gap magnetic fields were got. The air-gap magnetic fields were analysed by the harmonic spectrum. On that basis, inductance of BDFM with salient pole rotor was calculated, then inductance parameter waveform of power winding and control winding was given.Because DC component in mutual-inductance is fairly large, pole arc coefficient and pitch was used to optimization design. The changes of the design parameters effect on the rotor coupling capability was studied.As a result, suitable pitch and pole arc coefficient can decrease or eliminate DC component in mutual-inductance, at the same time, increase the coupling capability.
Key words:  brushless doubly-fed machine; Ansoft/Maxwell 2D; pole arc coefficient; salient pole rotor