导热管与电机转子过盈联接有限元分析及优化

Finite Element Analysis and Optimization of Interference Fit of Heat Pipe and Motor Rotor

将导热管安装于电机转子中对转子进行散热,可提高电机的输出效率,而导热管与转子内孔的紧密接触是导热散热的关键因素.通过建立导热管与转子过盈联接的有限元模型,分析过盈量、摩擦因数以及配合长度对导热管与电机转子过盈联接静态和动态性能的影响.结果表明,过盈量和配合长度对结构的静态和动态力学性能影响较大.在有限元分析的基础上,对导热管与电机转子过盈联接最大法向接触应力进行多目标优化,得出导热管与转子最大法向接触应力最小的接触状态,以提高导热管与转子配合的可靠性以及转子轴的寿命.

The heat can be dissipated from the rotor with heat pipe installed in the motor rotor, which improves the efficiency of the output. While the interference fit between heat pipe and deep hole of motor rotor is the key factor for heat dissipating. After building the finite element analysis（FEA） model of interference fit between heat pipe and motor rotor, the static and dynamic performance impacted with interference, friction factor and matched length are calculated. The results show that interference and matched length have a greater influence on the static and dynamic mechanical properties of the structure. On the basis of FEA, multi-objective optimization is taken on the maximum normal contact stress of interference fit between heat pipe and motor rotor, the minimum contact state of maximum normal contact stress on heat pipe and the rotor is found, which improves the reliability of fit between heat pipe and motor rotor＇s hole, as well as service life of motor rotor.