Detent Force Minimization of Double-Sided Permanent Magnet Linear Synchronous Machine with 120° Phase Belt Toroidal Windings by Slot-Shift Structure

Jikai Si, Xiaobao Chai, Rui Nie, Yihua Hu and Yingsheng Li
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Jikai Si: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Xiaobao Chai: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Rui Nie: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Yihua Hu: Department of Electronic Engineering, University of York, York YO10 5DD, UK
Yingsheng Li: Zhengzhou Runhua Intelligent Equipment Co., Ltd., Zhengzhou 450004, China

Energies, 2022, vol. 15, issue 3, 1-14

Abstract: Double-sided permanent magnet linear synchronous machine with 120° phase belt toroidal windings (120°-TWDSPMLSM) suffers from large detent force due to the end effect and slot effect. Many existing methods can reduce the detent force of the 120°-TWDSPMLSM effectively. But they also minimize the back electromotive force (back-EMF) and thrust simultaneously. To alleviate this problem, this paper adopts a method of combining slot-shift structure with rearranging the 120° phase belt toroidal windings (120°-TW) to suppress the detent force and improve the back-EMF and thrust of the 120°-TWDSPMLSM simultaneously. First, the slots on the two sides of the primary part are stagger by an optimal distance to reduce the detent force. The models of the detent force, including the end force and cogging force, is established theoretically, and then verified by finite-element analysis (FA). Then, the 120°-TW are rearranged to improve the back-EMF and average thrust. And the electromagnetic characteristics of the 120°-TWDSPMLSM under different shifted distances are analyzed and compared in detail. Finally, the result shows that the detent force of optimized machine is 70.19% lower than that of the original machine, and the thrust fluctuation reduces 19.21%. Besides, the back-EMF of optimized machine is 6.84% lower than that of the original machine, but 31.86 higher than the machine with shifting slots and without rearranging the 120°-TW. Therefore, the optimal method in this paper is available in the detent force reduction and thrust improvement of the 120°-DSPMLSM.

Keywords: 120° phase belt toroidal windings; detent force; double-sided; electromagnetic characteristic; permanent magnet linear synchronous machine; slot-shift (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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