脉冲电流作用下枢轨接触面瞬态摩损量计算

基于固体导热原理和多物理场耦合理论,推导出电枢表面瞬态磨损量计算方程,同时提出接触电阻和瞬态接触力的计算方法。在此基础上,总结并提出电枢瞬态磨损量的计算方法,并利用此方法分析了磨损量随着接触长度、宽度的变化规律:枢轨接触面的磨损主要分布在前端边缘以及两侧边缘,沿着接触长度方向,磨损量越来越小,沿着接触宽度方向,磨损量先减小后增大,中间部分磨损较小。电枢表面磨损率计算结果与美国德克萨斯大学高技术研究所的实验结果吻合较好,为建立电枢磨损量与转捩之间的关系奠定理论基础。

Transient wear capacity calculation of armature-rail interface in pulse current

Based on solid heat conduction theory and multi-physics field coupling theory, the calculation equation of the armature surface transient wear is deduced, and the calculation method of contact resistance and the transient contact force is proposed. On this basis, armature transient wear calculation method is summarized and presented. The armature transient wear is analyzed with this method, when the contact length and width are changed. Pivot rail contact surface of wear is mainly distributed in the front edge and on both sides of the edge. Along the length direction of the contact, the wear is more and more light; along the contact width direction, the wear quantity increases firstly and then decreases; the middle part wear is light. Finally, armature surface wear rate calculation results are compared with the experimental results of IAT and they are in good agreement. This lays a foundation to establish relationship between armature wear and the transition theory.