并列结构混合励磁同步电机的轴向漏磁及其影响

Axial Flux Leakage of Coordinate Structure Hybrid Excitation Synchronous Machine and Its Influence

并列结构混合励磁同步电机(hybrid excitation synchronous machine,HESM)是混合励磁电机的一种典型结构。该文指出并列结构混合励磁同步电机内永磁部分与电励磁部分之间存在漏磁通耦合现象。考虑漏磁通的3维分布特性,建立电机3维场有限元模型,分析轴向漏磁的磁通路径和分布情况,计算得到不同励磁电流方向下轴向漏磁大小和分布的变化规律,表明漏磁通存在使电励磁部分气隙磁场双向调节作用不对称,从而影响励磁电流对并列结构混合励磁同步电机输出电压的调节。原理样机实验结果验证了分析结论。轴向漏磁影响调磁特性的问题对其他并列结构混合励磁电机研究有普遍的参考价值,该类新型电机的设计中应注意合理选择永磁部分和电励磁部分转子之间的轴向距离。

Coordinate structure hybrid excitation synchronous machine （HESM） is an important type of hybrid excitation machine. Axial flux leakage between the permanent magnetic part and electrical excitation part is pointed out and studied in this paper. Then, considering the special structure and 3-Dimensional characteristic of flux leakage distribution, 3D-FEA （3D-finite element analysis） models of the proposed HESM are built. Finite-element analysis is performed to achieve the flux leakage path and magnetic field distribution. Magnitude of axial flux leakage varied with the excitation current is obtained by calculation. The results show that axial flux leakage has influence on the magnetic field regulating performance of electrical excitation part in coordinate structure HESM. Prototype generator is developed, and the experimental data confirm the simulation and analysis results. The research on influence of axial flux leakage provides a valuable reference to other types of coordinate structure HESM. It indicates that the axial distance between permanent magnetic part and electrical excitation part should be given more attention and reasonable design