CJEE

Chinese Journal of Electrical Engineering ›› 2023, Vol. 9 ›› Issue (3): 72-83.doi: 10.23919/CJEE.2023.000024

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Quantitative Comparison of Modular Linear Permanent Magnet Vernier Machines with and without Partitioned Primary*

Yunpeng Xu, Jinghua Ji*, Zhijian Ling, Chen Wang, Wenxiang Zhao   

  1. School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
  • Received:2022-11-22 Revised:2022-12-31 Accepted:2023-06-07 Online:2023-09-25 Published:2023-08-31
  • Contact: *E-mail: jjh@ujs.edu.cn
  • About author:Yunpeng Xu received a B.Sc. degree in Automation from Jiangsu University, Zhenjiang, China in 2020. He is currently working toward an M.Sc. degree in Control Engineering at Jiangsu University, Zhenjiang, China.
    His research interests include machine design and magnetic-field modulation analysis.
    Jinghua Ji received 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 affiliated 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, The University of Sheffield, Sheffield, UK. She has authored or coauthored over 50 technical papers in these areas. Her research interests include electrical machines and motor drives.
    Zhijian Ling received a B.Sc. degree in Electrical Engineering and Automation from Shandong Agriculture University, Tai’an, China, in 2013, and a Ph.D. 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.
    His research interests include the design and analysis of machines, including electrical actuators.
    Chen Wang received a B.Sc. degree in Electronic Information Science and Technology from Jiangsu University, Zhenjiang, China in 2015, where he is currently working toward a Ph.D. in Agricultural Engineering.
    His research interests include power converters and permanent-magnet motor drives.
    Wenxiang Zhao (M’08-SM’14) received B.Sc. and M.Sc. degrees in Electrical Engineering from Jiangsu University, Zhenjiang, China in 1999 and 2003, respectively, and a Ph.D. in Electrical Engineering from Southeast University, Nanjing, China in 2010.
    He has been affiliated 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, The University of Hong Kong, Hong Kong, China. From 2013 to 2014, he was a Visiting Professor with the Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, UK. He has authored and coauthored over 150 papers published in various IEEE Transactions. His research interests include electric machine design, modeling, fault analysis, and intelligent control.
  • Supported by:
    *National Natural Science Foundation of China under Grant 51977099 and in part by the National Natural Science Foundation of Jiangsu Higher Education Institutions under Grant 22KJB470010.

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Abstract: A comparison of two modular linear permanent-magnet vernier (LPMV) machines is presented. A modular LPMV machine with a partitioned primary, which can significantly improve the modulation effect, is proposed. Benefitting from the partition design, the space conflict between the permanent magnet (PM) and the armature magnetic field is relieved. First, the topologies of modular LPMV machines with and without a partitioned primary are presented. Then, the effect of the partitioned primary on the modular LPMV machine is analyzed using flux modulation theory. Moreover, analytical expressions for the trapezoidal permeance are derived. In addition, the harmonic components, back electromotive forces, and thrust forces of the machines with and without the partitioned primary are comparatively analyzed. The results reveal that the thrust force density of the LPMV machine with a partitioned primary is increased by 32.3%. Finally, experiments are performed on a prototype machine for validation.

Key words: Linear permanent magnet machine, partitioned primary, flux modulation theory, modular structure