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| A Review of Current Distribution in Electromagnetic Railguns |
| Ruan Jinghui1,2, Chen Lixue1,2, Xia Shengguo1,2, Wang Zengji1,2, Li Lidong1,2 |
1. Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology Wuhan 430074 China;
2. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China |
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Abstract The current distribution characteristics of electromagnetic railguns are closely related to its launch performance. Excessive current density in local areas will lead to current erosion and wear of armature and rail, interface melting deposition, transition arcs, etc., which could seriously affect the launch stability of armature and projectile, and do damage to rail and insulation of the bore. In this paper, three physical effects that determine the current distribution (skin effect, proximity effect, and velocity skin effect) are first described. Based on this, relevant research on the current distribution characteristics of electromagnetic railguns at home and abroad is summarized. The influence of the state of the pivot rail interface, the pivot rail material, the pivot rail structure, and the driving current on the current distribution are analyzed. The advantages of the saddle C-shaped armature in improving current distribution are proposed. Finally, some measures for optimizing the current distribution are summarized , which can provide technical support for the engineering application of electromagnetic orbit launch.
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Received: 21 November 2019
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2020, Vol. 35 
