Review of the Blushless Excitation and Torque Density Improvement in Wound Field Synchronous Motors
Fu Xinghe1, Jiang Zhenglong1, Lü Hongfei2, Gu Shengdong1, Cui Weilong1
1. School of Electrical Engineering Southeast University Nanjing 210096 China; 2. Institute of Electrical Engineering Karlsruhe Institute of Technology Karlsruhe 76131 Germany
Abstract Firstly, the performance differences between permanent magnet synchronous motors and wound field synchronous motors (WFSMs) are analyzed. Meanwhile, the characteristic advantages and existing technical problems of WFSMs are pointed out. Secondly, the evolution process and technical route of brushless excitation of WFSMs is summarized. The research progress and application level of exciter excitation, harmonic excitation, and inductive as well as capacitive wireless power transmission technology in field winding non-contact power supply is clarified. Then, the existing reluctance torque utilization technology, rotor structure improvement technology and torque axis shift technology are summarized. The beneficial effects of the above technologies on the torque improvement of WFSMs are pointed out. Finally, the issues in this field are stated, and the future research focus and technological development direction are predicted.
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