Influence of Magnet Shape on the Cogging Torque of a Surface-mounted Permanent Magnet Motor*

doi:10.23919/CJEE.2019.000026

Chinese Journal of Electrical Engineering ›› 2019, Vol. 5 ›› Issue (4): 40-50.doi: 10.23919/CJEE.2019.000026

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Influence of Magnet Shape on the Cogging Torque of a Surface-mounted Permanent Magnet Motor^*

Min Zhou^1,2, Xinxing Zhang^3,*, Wenxiang Zhao², Jinghua Ji², Jingning Hu¹

1. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University,Zhenjiang 212013, China;
2. School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China;
3. Jingjiang College, Jiangsu University, Zhenjiang 212013, China

Online:2019-12-25 Published:2020-03-12
Contact: * Email: zhangxinxing@ujs.edu.cn
About author:Min Zhou received the B.S. degree in electronic science and technology from Yancheng Institute of Technology, Yancheng, China, in 2017, and she is currently working toward the M.Sc. degree in power engineering and engineering thermophysics. Her current research interests include computation of electromagnetic ﬁelds for permanent-magnet machine and electric machine designs.
Xinxing Zhang received the B.S. and M.S. degrees from Jiangsu University, Zhenjiang, China, in 2015 and 2018, respectively. She is currently working at Jingjiang College, Jiangsu University. Her current research interests include computation of electromagnetic ﬁelds for permanent-magnet motor and motor design.
Wenxiang Zhao (M’08-SM’14) received the B.S. and M.S. 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, U.K. His current research interests include electric machine design, modeling, fault analysis, and intelligent control. He has authored and co-authored over 130 technical papers in these areas.
Jinghua Ji received the 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, U.K.Her areas of interest include motor design and electromagnetic field computation. She has authored and co-authored over 50 technical papers in these areas.
Jingning Hu received the B.S. degree in hydraulic machinery from Tsinghua University, Beijing, China, in 1984. From 1984 to 2004, he was in the industrial pump branch of Hefei General Machinery Research Institute, Ministry of machinery. He has been with the Research Center of Fluid Machinery Engineering and Technology, Jiangsu University since 2004, where he is currently a Professor. His current research interests include research and development of centrifugal pump products and localization of major equipment.
Supported by:
* Supported by the Key Research and Development Program of Jiangsu Province (BE2018107).

Abstract

Abstract: The influence of bread-loaf shaped magnet poles under parallel magnetization on the cogging torque of surface-mounted permanent magnet (SPM) motors is studied. For the SPM motors having magnetic poles with eccentricity and sine harmonic compensation, the electromagnetic performances of integer and fractional slot motors are compared. It is found that the cogging torque and torque ripple of the integer and fractional slot motors can be reduced with the same eccentric magnet pole. The cogging torque and torque ripple of a fractional slot motor can be decreased by sine harmonic compensation, however, the same sine harmonic compensation has a small influence in integer slot motors. By varying the magnetic poles, the contribution of the field harmonics (k = (2n + 1) p), which are a direct result of magnet magnetization, to the cogging torque also changes. The electromagnetic performance of a 3 kW prototype is tested, and it is found that the experimental results validate the theoretical investigation.

Key words: Analytical model, bread-loaf magnet shape, finite-element (FE), cogging torque, surface-mounted permanent magnet (SPM) motor

Min Zhou, Xinxing Zhang, Wenxiang Zhao, Jinghua Ji, Jingning Hu. Influence of Magnet Shape on the Cogging Torque of a Surface-mounted Permanent Magnet Motor^*[J]. Chinese Journal of Electrical Engineering, 2019, 5(4): 40-50.

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Influence of Magnet Shape on the Cogging Torque of a Surface-mounted Permanent Magnet Motor^*

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