Demagnetization Analysis of Modular SPM Machine Based on Coupled Electromagnetic-Thermal Modelling

Wei Zhang, Guang-Jin Li (), Zi-Qiang Zhu, Bo Ren, Yew Chuan Chong and Melanie Michon
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Wei Zhang: Electrical Machines & Drives Group, Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S10 2TN, UK
Guang-Jin Li: Electrical Machines & Drives Group, Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S10 2TN, UK
Zi-Qiang Zhu: Electrical Machines & Drives Group, Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S10 2TN, UK
Bo Ren: Motor Design Limited, Wrexham LL13 7YT, UK
Yew Chuan Chong: Motor Design Limited, Wrexham LL13 7YT, UK
Melanie Michon: Motor Design Limited, Wrexham LL13 7YT, UK

Energies, 2022, vol. 16, issue 1, 1-17

Abstract: This paper investigates magnet demagnetization characteristics of the modular permanent magnet machine. The influence of flux gaps on magnet flux density, losses distribution, torque and demagnetization are analyzed for different operating conditions. The magnet demagnetizations caused by three sources, such as the PM field, the armature field, and the magnet temperature rise, are individually investigated using the frozen permeability method. Furthermore, coupled electromagnetic (EM)-thermal modelling is also adopted in this paper to fully reveal the advantages of the modular machine in improving machine EM performances. This is essential due to the temperature-dependent properties of the machines, such as the magnet remanence, coercivity, and copper resistivity. For comparison propose, the EM performances with a particular focus on the demagnetization withstand capability for both the modular and non-modular machines are investigated based on the EM-thermal coupling. It is found that, compared to the non-modular machine, the modular machine can achieve higher torque, higher efficiency, and better demagnetization withstand capability.

Keywords: coupled electromagnetic-thermal modelling; flux gaps; frozen permeability; irreversible demagnetization; modular SPM machine (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
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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