A Hybrid PM-Assisted SynRM with Ferrite and Rare-Earth Magnets
Lin Yingqian1,2, Sun Yi1,2, Wang Yunchong1,2, Shen Jianxin1,2
1. College of Electrical Engineering Zhejiang University Hangzhou 310027 China; 2. Zhejiang Provincial Key Laboratory of Electrical Machine Systems Hangzhou 310027 China
Abstract：The inherent feature of high efficiency over wide speed range positions permanent-magnet-assisted synchronous reluctance machine (SynRM) as an appealing contender for high-performance variable speed applications. Though the magnets are for assistance only, their characteristics have a significant effect on the machines, e.g., the rare-earth magnet encounters high cost and volatile supply chain issues while the ferrite one faces low energy product and demagnetization problems. This paper proposes a new hybrid PM-assisted SynRM by taking into consideration the effect from the large magnetic characteristic difference between the rare-earth and ferrite magnet materials. The anti-demagnetization capability of the machine can be significantly improved by allocating rare-earth magnets in the barriers adjacent to rotor outer periphery. Comprehensive analysis results have indicated an optimal ratio of slightly above 5% between rare earth and ferrite magnet volumes strikes a balance between the anti-demagnetization capability and the cost per Newton-Meter for such hybrid machine. A hybrid prototype with 5.5% rare-earth magnet volume ratio is designed to compare with its existing conventional counterparts which employ ferrite and rare-earth magnets individually. Both the finite element analysis and experimental results have revealed that all three machines have almost identical performance, but the hybrid machine has evidently enhanced the demagnetization withstanding capability over the ferrite PM-assisted SynRM and significantly reduced the magnet cost over the rare-earth one.
基金资助:Natural Science Foundation of China under the grants of 51837010 and 51690182.
通讯作者:
Shen Jian-xin, male, born in 1969, professor, major research interests include topologies, control and applications of permanent magnet machines and drives, and renewable energies. E-mail: J_X_Shen@zju.edu.cn
作者简介: Lin Yingqian, male, born in 1994, Ph.D. candidate, major research interests include design of high efficiency and low noise synchronous reluctance machines.E-mail: linyingqian2007@163.com
引用本文:
林迎前, 孙毅, 王云冲, 沈建新. 稀土和铁氧体混用永磁辅助同步磁阻电机[J]. 电工技术学报, 2022, 37(5): 1145-1157.
Lin Yingqian, Sun Yi, Wang Yunchong, Shen Jianxin. A Hybrid PM-Assisted SynRM with Ferrite and Rare-Earth Magnets. Transactions of China Electrotechnical Society, 2022, 37(5): 1145-1157.
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2022, Vol. 37 
