The Effects of Permanent Magnet Segmentations on Electromagnetic Performance in Ironless Brushless DC Motors

Fugang Zhai, Liu Yang, Wenqi Fu, Haisheng Tong and Tianyu Zhao
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Fugang Zhai: School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
Liu Yang: School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
Wenqi Fu: Beijing Institute of Aerospace Control Devices, Beijing 100039, China
Haisheng Tong: Inner Mongolia North Heavy Industries Group CORP.LTD, NORINCO GROUP, Baotou 014033, China
Tianyu Zhao: NO. 703 Research Institute of China State Shipbuilding Company Limited, Harbin 150001, China

Energies, 2022, vol. 15, issue 2, 1-18

Abstract: This paper investigates the electromagnetic torque by considering back electromagnetic force (back-EMF) trapezoidal degrees of ironless brushless DC (BLDC) motors through the two-dimensional finite element method (2-D FEM). First, the change percentages of the electromagnetic torque with back-EMF trapezoidal degrees, relative to those of PMs without segments, are investigated on the premise of the same back-EMF amplitude. It is found that both PM symmetrically and asymmetrically segmented types influence back-EMF trapezoidal degrees. Second, the corresponding electromagnetic torque, relative to that of PMs without segments, is studied in detail. The results show that the electromagnetic torque can be improved or deteriorated depending on whether the back-EMF trapezoidal degree is lower or higher than that of PMs without segments. Additionally, the electromagnetic torque can easily be improved by increasing the number of PMs’ symmetrical segments. In addition, the electromagnetic torque in PMs with asymmetrical segments is always higher than that of PMs without segments. Finally, two ironless PM BLDC motors with PMs symmetrically segmented into three segments and without segments are manufactured and tested. The experimental results show good agreement with those of the 2-D FEM method. This approach provides significant guidelines to electromagnetic torque improvement without much increase in manufacturing costs and process complexity.

Keywords: ironless BLDC motor; PM symmetrical segment; PM asymmetrical segment; back-EMF trapezoidal degree; electromagnetic torque (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: 2022
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