无刷双馈电机谐波转矩及定子绕组环流的分析

Analyses of Harmonic Torque and Circular Current in the Stator Winding of Brushless Doubly-Fed Machines

在分析无刷双馈电机的磁场分布及定子功率绕组、定子控制绕组和转子绕组所产生的各次谐波及其相互作用的基础上,提出了谐波等效电路.分析了谐波转矩的产生及其对无刷双馈电机运行性能的影响,并分析了无刷双馈电机转子绕组感应电流产生的谐波磁场在定子绕组中的感应电压,以及定子绕组并联支路中环流的产生原因.为无刷双馈电机的分析设计及其谐波分析提供了理论工具.

A harmonic equivalent circuit of BDFM (Brushless Double-Fed Machine) is proposed based on the ana-lysis of the magnetic field distribution of BDFM and the analysis of the harmonic magnetic filed reciprocity among the stator power winding, the stator control winding and the rotor winding. The creation of the harmonic torque and its influence on the operation performance of BDFM are then analyzed. Moreover, the induction voltage in the stator windings resulting from the harmonic magnetic field of the induction current in the rotor winding is analyzed, and the reason for creating the circular current in a parallel branch of stator windings are presented, thus a theoretical foundation for the design and harmonic analysis of BDLM being laid.