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<p>To address insulation aging and permanent magnet demagnetization caused by high temperatures during permanent magnet motor operation, it is essential to study the motor’s cooling and heat dissipation structure. This paper takes an asymmetric hybrid rotor structure permanent magnet synchronous motor with a peak power of 60 kW as an example. First, the losses at different rotational speeds during the weak magnetic control process are investigated. Next, the temperature rise of each component is compared in Fluent when different cooling channels are used during the weak magnetic acceleration process, and the optimal channel structure is selected. Further research is conducted for the 12 000 rpm operating condition, which has the highest heat dissipation demand, comparing the temperature rise of the windings and the pressure differential of the water channel at different water injection flow rates, to select the optimal flow rate. To address the insufficient cooling of the end windings by the water-cooled structure alone, an air-cooled structure is added for simulation. The results show that adding the air-cooled structure effectively alleviates the high temperature problem of the end windings in the permanent magnet motor and also provides good cooling and heat dissipation for the rotor and permanent magnet parts.</p>

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Heat dissipation study of AHRPM motor for electric vehicles

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • H. G. Gao,
  • C. H. Zhao,
  • Z. H. Cao

摘要

To address insulation aging and permanent magnet demagnetization caused by high temperatures during permanent magnet motor operation, it is essential to study the motor’s cooling and heat dissipation structure. This paper takes an asymmetric hybrid rotor structure permanent magnet synchronous motor with a peak power of 60 kW as an example. First, the losses at different rotational speeds during the weak magnetic control process are investigated. Next, the temperature rise of each component is compared in Fluent when different cooling channels are used during the weak magnetic acceleration process, and the optimal channel structure is selected. Further research is conducted for the 12 000 rpm operating condition, which has the highest heat dissipation demand, comparing the temperature rise of the windings and the pressure differential of the water channel at different water injection flow rates, to select the optimal flow rate. To address the insufficient cooling of the end windings by the water-cooled structure alone, an air-cooled structure is added for simulation. The results show that adding the air-cooled structure effectively alleviates the high temperature problem of the end windings in the permanent magnet motor and also provides good cooling and heat dissipation for the rotor and permanent magnet parts.