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A Comprehensive Investigation of Winding Eddy and Circulating Current Losses of Stator Iron Coreless PMBLDC Motors

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  • Liu Yang

    (School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
    State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
    School of Automation, Beijing Institute of Technology, Beijing 100081, China)

  • Jing Zhao

    (School of Automation, Beijing Institute of Technology, Beijing 100081, China)

  • Wenqi Fu

    (Beijing Institute of Aerospace Control Devices, Beijing 100039, China)

  • Xiangdong Liu

    (School of Automation, Beijing Institute of Technology, Beijing 100081, China)

  • Jianguo Zhu

    (School of Electrical and Information Engineering, University of Sydney, Sydney, NSW 2006, Australia)

  • Chao Ai

    (School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China)

Abstract

A method is proposed to comprehensively study the eddy and circulating current losses of stator winding wound by multiple parallel strands, to further improve the power density of stator iron coreless permanent magnet brushless DC (PMBLDC) motors. Analytical models of the eddy and circulating current losses in stator winding are deduced firstly to explicitly express the influencing factors of these two losses. As is shown, these factors are mutually contradicting. While the eddy current loss can be greatly reduced by using multiple parallel conductor strands, the circulating current loss will be extensively increased. The factors influencing these two winding losses, such as the strand diameter, magnetization types, and rotating speed, are investigated. A prototype of stator iron coreless PMBLDC motor without an inner rotor core is manufactured and tested to validate the theory. The experimental results of winding eddy and circulating current losses with different combinations of strand diameters and parallel numbers agree well with the theoretical results.

Suggested Citation

  • Liu Yang & Jing Zhao & Wenqi Fu & Xiangdong Liu & Jianguo Zhu & Chao Ai, 2023. "A Comprehensive Investigation of Winding Eddy and Circulating Current Losses of Stator Iron Coreless PMBLDC Motors," Energies, MDPI, vol. 16(14), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:14:p:5523-:d:1199087
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