Research on Multi-field Coupling and Heat Transfer Characteristics of Air-cooled High Speed Magnetically Suspended Permanent Magnet Synchronous Motor

doi:10.3901/JME.260412

Abstract

Abstract: Magnetically suspended permanent magnet synchronous motor(MSPMSM) has many hot parts, complex structure and the problem of heat transfer coupling between magnetic bearings and motor. In order to accurately analyze the multi-field coupling and heat transfer characteristics of the system, an air-cooled high-speed MSPMSM is taken as the research object. The electromagnetic and wind-friction loss models of magnetic bearings and motor are established, and the calculated results are mapped as heat sources into the thermal-flow field model for numerical solution, and then the obtained steady-state temperature is used as the boundary condition to compute the electromagnetic losses again. Based on this, a bidirectional magnetic-thermal-flow field coupling analysis model considering the heating of magnetic bearings is established. The flow characteristics of cooling air and the steady-state temperature distribution of the system are obtained. Besides, the effect of the temperature rise on the electromagnetic loss and the effects of different cooling air volume on steady-state temperature are explored. In order to verify the validity and accuracy of the proposed model, a prototype test platform is set up. The results show that the error of the inlet static pressure is 3.4%, and the error between the calculation and experiment of the steady-state temperature is less than 8.5 ℃. This research provides theoretical support for the cooling design and temperature rise prediction of MSPMSM.

Key words: magnetically suspended permanent magnet synchronous motor, temperature rise characteristic, multi-physics coupling, magnetic bearings

CLC Number:

TM351

XU Yuanping, ZHENG An, ZHOU Jin, JIN Chaowu, LING Yangyi, LI Yaning. Research on Multi-field Coupling and Heat Transfer Characteristics of Air-cooled High Speed Magnetically Suspended Permanent Magnet Synchronous Motor[J]. Journal of Mechanical Engineering, 2026, 62(9): 145-154.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260412

http://www.cjmenet.com.cn/EN/Y2026/V62/I9/145

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