Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Health diagnosis of permanent magnets under different cooling system effectiveness in high-speed permanent magnet motors for electric vehicles

  • Meiwei Zhang (School of Electrical Engineering, Beijing Jiaotong University) ;
  • Weili Li (School of Electrical Engineering, Beijing Jiaotong University) ;
  • Wanlu Xie (School of Electrical Engineering, Beijing Jiaotong University) ;
  • Haoyue Tang (School of Electrical Engineering, Beijing Jiaotong University) ;
  • Zhigang Wu (School of Electrical Engineering, Beijing Jiaotong University)
  • Received : 2022.02.26
  • Accepted : 2022.10.13
  • Published : 2023.03.20
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Abstract

The power density of a high-speed permanent magnet (PM) motor is high, and the heat dissipation of its rotor is poor due to limited installation space. Th0000000000000000000us, the temperature of the permanent magnets is high. Once the cooling system of a motor becomes ineffective and the rotor temperature exceeds the limit temperature of the PM material, a demagnetization fault of the PM occur, which seriously affects the performance of the PM motor. To ensure the safe and reliable operation of PM motors, a method to diagnose the PM health is presented in this paper. The demagnetization ratio of the PM can be diagnosed quantitatively by its temperature. In this paper, the relationship between the temperature and the demagnetization ratio of a PM is obtained through thermal demagnetization tests, and the threshold temperature of demagnetization is given. Then, the health of a PM under different effectiveness of the cooling system in a high-speed PM motor is researched. Finally, the calculation results are verified by temperature tests of a high-speed PM motor.

Keywords

Acknowledgement

This work was supported by the Fundamental Research Funds for the Central Universities 2019JBZ101 and the High power and high efficiency electric drive assembly system development and industrialization project TC210H02Q in China.

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