Current Distribution Characteristics of Armature-Rail Interface under Velocity Skin Effect and Contact Resistance
Wang Zengji1,2, Chen Lixue1,2, You Penghao1,2, Lan Xinyu1,2, Ge Yifan3
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China; 2. Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology Wuhan 430074 China; 3. Wuhan Institute of Technology Wuhan 430205 China
Abstract：In this paper, the current distribution of railgun is calculated by finite element method. In this paper, according to the different factors in the model, three models are established: the velocity skin effect model, the contact resistance model and the composite model. Firstly, by setting up the coordinate system on the armature and adding the velocity term to the Maxwell equations, the velocity skin effect caused by the armature motion is calculated. Secondly, the rough surface characteristics of armature and rail and the contact pressure between armature and rail are considered in the contact resistance model. Finally, a composite model is established by combining above models. By comparing and analyzing the current distribution characteristics of each model on the armature-rail interface, this paper shows that the composite model is the most accurate. It is shown that the velocity skin effect and contact resistance are the key factors affecting the performance of electromagnetic railgun.
王增基, 陈立学, 尤彭昊, 兰昕宇, 葛一凡. 考虑速度趋肤效应与接触电阻影响的枢轨界面电流分布特性[J]. 电工技术学报, 2022, 37(19): 5003-5010.
Wang Zengji, Chen Lixue, You Penghao, Lan Xinyu, Ge Yifan. Current Distribution Characteristics of Armature-Rail Interface under Velocity Skin Effect and Contact Resistance. Transactions of China Electrotechnical Society, 2022, 37(19): 5003-5010.
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