Magnets Shifting Design of Dual PM Excited Vernier Machine for High-torque Application*

doi:10.23919/CJEE.2022.000028

Chinese Journal of Electrical Engineering ›› 2022, Vol. 8 ›› Issue (3): 90-101.doi: 10.23919/CJEE.2022.000028

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Magnets Shifting Design of Dual PM Excited Vernier Machine for High-torque Application^*

Feilong Yan, Jinghua Ji^*, Zhijian Ling, Yuhua Sun, Wenxiang Zhao

School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China

Received:2021-11-01 Revised:2022-02-26 Accepted:2022-03-30 Online:2022-09-25 Published:2022-10-21
Contact: * E-mail: jjh@ujs.edu.cn
About author:Feilong Yan received the B.Sc. degree in Electrical Engineering from Henan University of Science and Technology, Luoyang, China, in 2018. He is currently working toward the M.Sc. degree in Electrical Engineering from Jiangsu University, Zhenjiang, China.His research interests include machine design and electromagnetic field analysis.
Jinghua Ji received the B.Sc., M.Sc., and Ph.D. degrees in Electrical Engineering from Jiangsu University, Zhenjiang, China, in 2000, 2003, and 2009 respectively. Since 2000, she has been with the School of Electrical and Information Engineering, Jiangsu University, where she is currently a Professor.From 2013 to 2014, she was a Visiting Scholar with the Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, UK. Her areas of interest include motor design and electromagnetic field computation. She has authored and co-authored over 50 technical papers in these areas.
Zhijian Ling received the B.Sc. degree in Electrical Engineering and Automation from Shandong Agriculture University, Taian, China, in 2013, and the Ph.D. degree in Electrical Engineering from Jiangsu University, Zhenjiang, China, in 2020. He is currently a Lecturer with the School of Electrical and Information Engineering, Jiangsu University. From September 2018 to August 2019, he was a joint Ph.D. student funded in the Department of Energy Technology, Aalborg University, Aalborg, Denmark. His research interests include the design and analysis of permanent magnet electrical machines, and electrical actuators.
Yuhua Sun received the B.Sc. degree in Electrical Engineering from Qilu University of Technology (Shandong Academy of Sciences), Jinan, China, in 2017. He is currently working toward the Ph. D. degree in Electrical Engineering at Jiangsu University, Zhenjiang, China.His research interests include machine design and electromagnetic field analysis.
Wenxiang Zhao (M’08-SM’14) received the B.Sc. and M.Sc. degrees from Jiangsu University, Zhenjiang, China, in 1999 and 2003, respectively, and the Ph.D. degree from Southeast University, Nanjing, China, in 2010, all in Electrical Engineering.He has been with Jiangsu University since 2003, where he is currently a Professor with the School of Electrical Information Engineering. From 2008 to 2009, he was a Research Assistant with the Department of Electrical and Electronic Engineering, University of Hong Kong, Hong Kong. From 2013 to 2014, he was a Visiting Professor with the Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, UK. His current research interests include electric machine design, modeling, fault analysis, and intelligent control. He has authored and co-authored over 200 technical papers in these areas.
Supported by:
* National Natural Science Foundation of China under Grant 52025073, and the Natural Science Foundation of Jiangsu Province under Grant BK20210770.

Abstract

Abstract: In this study, a novel dual permanent magnet excited vernier machine (DPMEVM) with magnets shifting in stator is proposed. Compared with the conventional permanent magnet synchronous machine (PMSM), the DPMEVM based on the bidirectional field modulation effect can operate in a wider torque range. However, the torque ripple of a conventional DPMEVM is high because of the superposition of the torque generated by the stator-side and rotor-side PMs. Consequently, a novel DPMEVM with magnets shifting is proposed to further reduce the torque ripple. First, the topologies and working principles of the baseline machine and proposed machines are introduced. Second, the torque-contribution harmonics are analyzed and calculated using the Maxwell tensor method. The calculation results reveal that the DPMEVM, benefiting from multiple working harmonics, can offer an enhanced torque capability compared to the PMSM. In addition, the torque ripple characteristics of the proposed machines are analyzed. It is verified that the torque ripple can be significantly reduced through magnets shifting. Third, the performances of the baseline machine and proposed machines are analyzed and compared in terms of flux density, open-circuit back-EMF, and torque characteristics. In addition, the proposed principle can be extended to machines with the same unit motor. Finally, a 120s-110p prototype machine is manufactured for validation.

Key words: Permanent magnet vernier machine, bidirectional field modulation effect, magnets shifting, multiple working harmonics, torque

Feilong Yan, Jinghua Ji, Zhijian Ling, Yuhua Sun, Wenxiang Zhao. Magnets Shifting Design of Dual PM Excited Vernier Machine for High-torque Application^*[J]. Chinese Journal of Electrical Engineering, 2022, 8(3): 90-101.

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Magnets Shifting Design of Dual PM Excited Vernier Machine for High-torque Application^*

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