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To enhance modeling accuracy and reduce computational time for external rotor permanent magnet direct drive motors, a magnetic circuit equivalent model is proposed. This model fully accounts for the influences of magnetic saturation and leakage flux. Through the division of the permanent magnet into different sections based on the magnetic circuit, a magnetic equivalent circuit containing nonlinear magnetic reluctance is developed. Utilizing this equivalent model and the characteristics of the motor structure, the main static characteristics of the motor are computed, including air gap magnetic flux density, magnetic flux waveform, back electromotive force, and average output torque. Comparative analysis with results from 3D finite element simulations is conducted to examine the accuracy of the model, thus validating the effectiveness of the proposed equivalent model.

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Magnetic Equivalent Circuit Modeling of Permanent Magnet Synchronous Motor with External Rotor

  • 会议论文

  • 发表日期：

    2025年

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  • Yewei Wang,
  • Zhike Xu,
  • Long Jin,
  • Hongbin Zhang,
  • Jun Hong

摘要

To enhance modeling accuracy and reduce computational time for external rotor permanent magnet direct drive motors, a magnetic circuit equivalent model is proposed. This model fully accounts for the influences of magnetic saturation and leakage flux. Through the division of the permanent magnet into different sections based on the magnetic circuit, a magnetic equivalent circuit containing nonlinear magnetic reluctance is developed. Utilizing this equivalent model and the characteristics of the motor structure, the main static characteristics of the motor are computed, including air gap magnetic flux density, magnetic flux waveform, back electromotive force, and average output torque. Comparative analysis with results from 3D finite element simulations is conducted to examine the accuracy of the model, thus validating the effectiveness of the proposed equivalent model.