Chinese Journal of Electrical Engineering ›› 2020, Vol. 6 ›› Issue (4): 86-96.doi: 10.23919/CJEE.2020.000033

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Sleeve Design of Permanent-magnet Machine for Low Rotor Losses*

Junqiang Zheng1,*, Wenxiang Zhao1, Jinghua Ji1, Jihong Zhu2, Christopher H. T. Lee3   

  1. 1. School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China;
    2. Department of Computer Science and Technology, Tsinghua University, Beijing 100000, China;
    3. School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore
  • Received:2020-05-27 Revised:2020-08-03 Accepted:2020-08-19 Online:2020-12-25 Published:2021-01-15
  • Contact: *E-mail: 2289832202@qq.com
  • About author:Junqiang Zheng received his B.S. degree in electrical engineering from Jiangsu University, Zhenjiang, China, in 2014, where he is currently working toward a Ph.D. degree in electrical engineering. His research interests include machine design and electromagnetic field computation.
    Wenxiang Zhao (M'08-SM'14) received B.S. and M.S. degrees from Jiangsu University, Zhenjiang, China, in 1999 and 2003, respectively, and a 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, 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, 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 250 technical papers in these areas.
    Jinghua Ji received B.S., M.S., 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 100 technical papers in these areas.
    Jihong Zhu received his B.S. degree in electrical engineering from Jiangsu University, Zhenjiang, China, in 1990, and a Ph.D. degree in control engineering from Nanjing University of Science and Technology, Nanjing, China, in 1995. From 1996 to 1997, he was with Nanjing University of Aeronautics and Astronautics, Nanjing, China, where he was a post doctor and an associate professor, respectively. Since 1998, he has been with Tsinghua University, where he is currently a professor. He has authored and co-authored over 150 technical papers, and is the holder of over 60 patents in the areas of his teaching and research interests, which include motor control and flight control.
    Christopher H. T. Lee (M'12-SM'18) received his B.E. (First Class Honors) and Ph.D. degrees in electrical engineering from the Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China. He currently serves as an assistant professor in the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, and is also a visiting scientist in the Research Laboratory of Electronics, Massachusetts Institute of Technology, USA. His research interests include electric machines and drives, renewable energies, and electric vehicle technologies. In these areas, he has published about 60 technical papers. Dr. Lee has received many awards, including the Li Ka Shing Prize (the best Ph.D. thesis award) and Croucher Foundation Fellowship.; * Supported by the National Natural Science Foundation of China (51991383), the Natural Science Foundation of Jiangsu Province (BK20171298), the Graduate Scientific Research Innovation Project of Jiangsu Province (KYCX18_2248) and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

Abstract: In this study, a novel rotor sleeve for permanent-magnet (PM) machines equipped with fractional-slot concentrated-windings (FSCW) is proposed. With the newly designed rotor sleeve, the rotor eddy-current (EC) losses are significantly reduced, and the torque density of the machine is improved. First, the rotor EC losses of a surface-mounted PM machine with the sleeve are analyzed. Meanwhile, the sleeve EC barriers and PM segmentation technologies for the suppression of the rotor EC losses are evaluated. Subsequently, an FSCW PM machine with the newly designed sleeve is proposed and optimized for a given set of specifications. Its electromagnetic and mechanical performances are evaluated by the finite element method (FEM). Finally, three assembling methods are presented and assessed comprehensively in terms of their merits and drawbacks.

Key words: Permanent-magnet machine, rotor losses, sleeve, eddy-current, concentrated-windings