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Analysis of mechanical flux-weakening by using the end-cap of the switched flux permanent magnet machines

Qiang Zhao (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin, China; Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province, Hebei University of Technology, Tianjin, China and Department of Electrical Engineering, Jiangsu Normal University, Xuzhou, China)
Xu Liu (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin, China and Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province, Hebei University of Technology, Tianjin, China)

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering

ISSN: 0332-1649

Article publication date: 5 October 2022

Issue publication date: 12 January 2023

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Abstract

Purpose

The purpose of this study is to develop a novel mechanical flux-weakening topology for the switched flux permanent magnet (SFPM) machine to extend the speed range, which will be suitable for the electric vehicles and hybrid electric vehicles.

Design/methodology/approach

The 3 dimensional mechanical flux-weakening model with flux adjusters (FAs) in the end-cap is established. Subsequently, the electromagnetic performance is compared between the SFPM machine with FAs in the end-cap and without FAs. The open circuit flux-linkage is calculated by finite element analysis (FEA) to investigate the influence of this mechanical flux-weakening topology together with the d/q-axis inductance. The flux-weakening capability and torque-speed curve is also calculated.

Findings

The proposed topology decreases the permanent magnet flux-linkage and increases the d-axis inductance, which improve the flux-weakening capability simultaneously. Subsequently, the speed range and constant power region are much wider than those without FAs. Finally, the prototype is fabricated and the measured result of the open circuit back electromotive force has good agreement with the FEA result.

Originality/value

This paper provides a novel mechanical flux-weakening topology with FAs in the end-cap for the SFPM machine, whose volume is smaller than another mechanical flux-weakening topology with FAs at the stator outside. Thus, higher torque and power density can be obtained compared with the SFPM machine with FAs at the stator outside.

Keywords

Acknowledgements

This work was supported in part by the Natural Science Foundation of China under Grant 52077055, and in part by the Projects of Central Government to Guide Local Scientific and Technological Development under Grant 226Z1601G.

Citation

Zhao, Q. and Liu, X. (2023), "Analysis of mechanical flux-weakening by using the end-cap of the switched flux permanent magnet machines", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 42 No. 1, pp. 250-260. https://doi.org/10.1108/COMPEL-01-2022-0066

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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