无刷双馈电机笼型转子磁场调制能力分析

Analysis of Magnetic Field Modulation Capability of Cage Rotor of Brushless Doubly-Fed Machine

笼型转子无刷双馈电机(BDFM)由于其简单且特殊的转子结构,使得转子磁场谐波含量大,直接影响转子的磁场调制能力。从电机内部磁场入手,提出了一种快速计算BDFM转子磁场的方法,分析了转子磁场与转子短路环个数及短路环分布的关系。以短路环个数及短路环分布跨距为参数,建立MATLAB计算程序对转子磁场调制能力进行分析,研究了转子的极限调制能力。最后,通过Flux电磁场有限元分析软件建立电机模型并对所提方法进行了验证。研究结果有助于优化转子结构设计。

Because of its simple and special rotor structure, the cage rotor brushless doubly-fed machine(BDFM) has rich magnetic field harmonic content, which directly affects the rotor′s magnetic field modulation capacity. From the internal magnetic field of the motor, a fast method to calculate the rotor magnetic field of the BDFM is proposed, and the influences of the number and distribution of short circuit rings on the rotor magnetic field are analyzed. Taking the number and span of short circuit rings as the parameters, the MATLAB calculation program is established to analyze the modulation capacity of the rotor. The ultimate modulation capacity of the rotor is studied. The electromagnetic field finite element analysis software Flux is used to establish the motor model for verification. The results are helpful to the optimization design of rotor structure.