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标题：高空条件下永磁无刷直流电机温度场研究 |
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作者：张明慧，刘卫国 |
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| 2017年第2期 访问次数：266次 |
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摘要：现代永磁无刷直流电机（BLDCM）具有效率高、功率密度高、可靠性能好等一系列优点，成为高空飞行器电推进系统驱动电机的理想选择。然而由于高空条件具有独特的气温、气压等环境因素，导致BLDCM在高空条件下发热严重、散热困难，其温度场的分布也与地面时有较大差异。本文基于高空条件下的大气密度特性、温度特性、风速特性等特征及电机与环境的换热关系，采用有限元数值方法建立了BLDCM在高空条件下的温度场计算模型。计算了BLDCM在不同环境下的散热边界条件以及电机内部各种换热系数，分析了海拔高度、环境温度等因素对BLDCM高空条件下温度场的影响。同时通过BLDCM高空适应性研究的实验，验证和对比地面环境与高空环境电动机温度场的变化情况。
关键词：永磁无刷直流电机；有限元；高空环境；温度场
Abstract: Permanent magnet brushless DC motors (BLDCM) are very attractive for application in the aerospace field because of their numerous advantages, such as high power density, high efficiency, small size, light weight, high reliability, etc. Operating in high altitude environment, however, presented challenges with respect to heat dissipation and thermal management in the BLDCM. Based on the finite element method, the model of the electromagneticthermal coupling field was established. The atmospheric parameters and heat dissipation characters under high altitude environment were prescribed. The thermal boundary conditions and the various heat transfer coefficients in the BLDCM were determined. Combining the experiments on highaltitude adaptation research of the prototype, the variations of thermal fields in BLDCM were compared and verified in ground environment and highaltitude environment.
Key words: permanent magnet brushless DC motor (BLDCM);finite element method (FEM);high altitude environment;thermal field
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