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For the operation of the PMSM, when facing the conditions of high temperature, demagnetizing field or other bad conditions, the permanent magnet in motor would have irreversible demagnetization, which could affect the whole machine. So far, many analytics methods and numerical methods are used in dealing with the calculation of demagnetization field. In this paper, a hybrid model combined analytical subdomain method and FEM is proposed. The FEM is used to model the rotor part of PMSM, and the subdomain method is used to model the air gap and stator. Comparison between different models was made to estimate the accuracy and speed of the proposed model, and the result shows that while retains high calculation accuracy, the model also improves greatly the speed when calculating the demagnetizing field problem.

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Demagnetization Calculation and Analysis of Permanent Magnet Synchronous Motors Based on Subdomain-Finite Element Hybrid Method

  • 会议论文

  • 发表日期：

    2025年

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  • Hansen Liang,
  • Bowen Xu,
  • Jien Ma,
  • Lin Qiu,
  • Youtong Fang

摘要

For the operation of the PMSM, when facing the conditions of high temperature, demagnetizing field or other bad conditions, the permanent magnet in motor would have irreversible demagnetization, which could affect the whole machine. So far, many analytics methods and numerical methods are used in dealing with the calculation of demagnetization field. In this paper, a hybrid model combined analytical subdomain method and FEM is proposed. The FEM is used to model the rotor part of PMSM, and the subdomain method is used to model the air gap and stator. Comparison between different models was made to estimate the accuracy and speed of the proposed model, and the result shows that while retains high calculation accuracy, the model also improves greatly the speed when calculating the demagnetizing field problem.