永磁同步牵引电机的温升计算研究

Study on Temperature-Rise Calculation of Permanent-Magnet Synchronous Traction Motor

永磁同步牵引电机在地铁、动车和航空等场合应用广泛,永磁同步电机具有体积小和功率密度大等优点,但是电机内部发热,导致温度场的分布不合理,引起诸多问题,比如温升过高会导致绝缘损坏、永磁体的失磁想象等,进而导致电气性能出现问题。在此详细介绍了牵引电机发展及其结构、电机流体场分析,并提出等效热路法与流体场结合分析温升方法。

The permanent-magnet synchronous traction motor has been widely used in industries of subway,bullet train and aviation,etc. It has the advantages of small volume and large power density,but the distribution of its temperature field is not reasonable because of internal fever of the motor. It results in many problems such as insulation damage caused by overhigh temperature rise and excitation-loss phenomenon of permanent magnets,and then leads to the problem of electrical performance. This paper introduces the development and structure of traction motor in detail,analyzes fluid field of it,and puts forward the equivalent heat path method to analyze temperature rise of it based on fluid field.