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

Liu Yang (), Jing Zhao (), Wenqi Fu, Xiangdong Liu, Jianguo Zhu and Chao Ai
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Liu Yang: School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, 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

Energies, 2023, vol. 16, issue 14, 1-16

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.

Keywords: stator iron coreless PMBLDC motor; winding eddy current loss; winding circulating current loss; power density (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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