不同转子结构无刷双馈电机的电磁和动态特性分析

简要介绍了无刷双馈电机(BDFM)的结构特点和工作原理,利用Ansoft/Maxwell建立笼型转子和磁障式磁阻转子的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,通过对气隙磁通密度波形的谐波频谱分析,得到了磁障式磁阻转子结构具有较好磁场调制效果。研究了由单馈异步牵入自然同步、亚同步和超同步运行状态的动态响应能力和机械负载突变时的转速转矩变化情况。结果表明磁障式磁阻转子BDFM在由单馈异步牵入自然同步、亚同步和超同步运行状态下,具有较好的动态响应能力,同时在加载时稳定性也较好,为进一步深入研究BDFM转子的优化设计和运行稳定性提供了参考。

Analysis of Electromagnet and Dynamic Performance for Brushless Doubly-Fed Machine with Different Rotor Structures

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,which contain the cage rotor and the reluctance rotor with blocked-magnetic layers.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.As a result,the blocked-magnetic reluctance rotor contains a better magnetic field modulation effects.The dynamic characteristics of the different BDFMs were researched under the states of single-fed asynchronous operation to natural synchronous,under-synchronous and over-synchronous operations.And the torque and speed had a change with variation in load.The results show that the blocked-magnetic reluctance rotor has a better dynamic characteristics in pulling in three states,and a better stability under load change.And it provide the foundation for the rotor structure design optimization and operating stability intensive research of BDFM.