同性极式感应子电机有限元分析及试验研究

同性极式感应子电机具有无刷励磁和结构简单等特点，在飞轮储能、脉冲功率电源等领域有着广阔的应用前景。首先给出同性极式感应子电机的拓扑结构和运行原理。采用有限元法分析了矩形槽、弧形槽和正弦形槽转子对电机气隙磁密、反电动势和转矩等电磁性能的影响，研究不同槽形的转子在高速旋转下的应力分布规律。然后，综合考虑电磁和机械特性，选择弧形槽转子结构的感应子电机作为对象，对其性能进行分析。最后，对一台感应子电机样机进行试验测试，验证了相关分析的合理性。研究结果表明：同性极式感应子电机采用正弦形槽转子虽能获得较为正弦的气隙磁密，但在相同槽深条件下其基波分量比矩形槽和弧形槽约少了25.2%和24.3%，并且输出转矩较低。此外，矩形槽和正弦形槽都出现了明显的应力集中，分别位于转子凸极根部和槽表面，而采用弧形槽具有更均匀的应力分布。

Finite Element Analysis and Experimental Research on Homopolar Inductor Machine

Homopolar inductor machines (HIMs) have broad application prospects in the fields of flywheel energy storage system, pulsed alternator and so on with the characteristics of brushless excitation and simple structure. Firstly, the topology and operating principle of the HIM are given. Seconldy, the influences of rotor with the rectangular, arc and sinusoidal slots on the electromagnetic properties such as air-gap flux density, back electromotive force (EMF) and torque are studied by finite element method. Thirdly, the stress distribution of rotors with different slot shapes under high-speed rotation is studied. Considering the electromagnetic and mechanical characteristics, an HIM with an arc slot rotor structure is selected as the object to analyze its performance. Finally, a prototype of HIM is tested to verify the rationality of the analysis. The results show that although the sinusoidal slot rotor can obtain a more sinusoidal air-gap flux density, its fundamental wave component is about 25.2% and 24.3% less than those of the rectangular and arc slots under the same slot depth, and the output torque is low. In addition, the rectangular and sinusoidal slots have obvious stress concentration, which are located at the root of the rotor salient pole and the slot surface respectively, while the rotor with arc slot has a more uniform stress distribution.