高速永磁电机转子蒸发冷却系统数值模拟

Numerical Simulation of Rotor Evaporative Cooling System for High-Speed Permanent Magnet Machine

对于大功率高速永磁电机,在高功率密度下转子散热困难,易造成永磁体发生不可逆退磁。为了解决转子的有效冷却问题,采用喷雾式新型蒸发冷却技术,利用相变吸热原理实现空心永磁转子蒸发冷却,基于计算流体力学方法,建立雾滴与空气的传热传质物理模型,对转子喷雾冷却系统进行数值模拟。研究表明,相变传热方式冷却效率高,转子的温度分布均匀,提高了高速永磁电机转子运行的可靠性和稳定性。本文提供的转子蒸发冷却计算方法,为蒸发冷却技术在大功率高速永磁电机转子冷却的应用提供理论依据。

For high-power high-speed permanent magnet （HSPM） machine, the rotor would easily lead to permanent demagnetization because of the high-power density. According to the phase change heat principle, the evaporative cooling spray was used to effectively realize rotor cooling. Based on computational fluid dynamic method, the heat and mass transfer physical model of the droplet and air was established to simulate the rotor spray cooling system. A number of studies show that the phase change heat transfer cooling is efficient and the rotor temperature distribution is in balance, which improves the reliability and stability of HSPM machine. The calculation method of evaporation cooling provides a theoretical basis for evaporative cooling applications on rotor of high-power HSPM machine.