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<p>The wet integration of motor and pump has become a promising configuration of the future electro-hydraulic actuator (EHA). However, the thermal coupling between the permanent magnet synchronous motor (PMSM) and the closed hydraulic system (CHS) poses significant challenges for temperature rise prediction. To address this, a dynamic thermal coupling model is proposed, incorporating time-varying parameters of multiple physical fields to analyze the oil-mediated heat exchange behavior in wet EHA. Firstly, independent thermal models for the PMSM and CHS are developed using the lumped parameter thermal network (LPTN) and control volume method, respectively. Then, combined with the special structure of wet EHA, the heat absorption and dissipation model of oil in the wet motor is established. Integrating the model, oil nodes serve as the link between two different lumped parameter methods. Simulations validate the model's accuracy, and the heat exchange law presented by results is analyzed and summarized. The results show that the wet structure reduces the temperature difference between the PMSM and CHS by facilitating heat transfer through leaked oil, which enhances convection with the outside. This mitigates motor "hot spots" but increases the CHS temperature. The proposed approach provides deeper insights into the thermal behavior of wet EHA and offers a theoretical basis for optimizing heat dissipation design. Future research will focus on enhancing the convective heat transfer between the CHS and the external environment.</p>

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Dynamic Heat Exchange Law Analysis Between the Permanent Magnet Synchronous Motor and Closed Hydraulic System of Wet Electro-hydrostatic Actuator

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Cun Shi,
  • Weiyu Wang,
  • Shaoping Wang,
  • Di Liu,
  • Shutong Zhao

摘要

The wet integration of motor and pump has become a promising configuration of the future electro-hydraulic actuator (EHA). However, the thermal coupling between the permanent magnet synchronous motor (PMSM) and the closed hydraulic system (CHS) poses significant challenges for temperature rise prediction. To address this, a dynamic thermal coupling model is proposed, incorporating time-varying parameters of multiple physical fields to analyze the oil-mediated heat exchange behavior in wet EHA. Firstly, independent thermal models for the PMSM and CHS are developed using the lumped parameter thermal network (LPTN) and control volume method, respectively. Then, combined with the special structure of wet EHA, the heat absorption and dissipation model of oil in the wet motor is established. Integrating the model, oil nodes serve as the link between two different lumped parameter methods. Simulations validate the model's accuracy, and the heat exchange law presented by results is analyzed and summarized. The results show that the wet structure reduces the temperature difference between the PMSM and CHS by facilitating heat transfer through leaked oil, which enhances convection with the outside. This mitigates motor "hot spots" but increases the CHS temperature. The proposed approach provides deeper insights into the thermal behavior of wet EHA and offers a theoretical basis for optimizing heat dissipation design. Future research will focus on enhancing the convective heat transfer between the CHS and the external environment.