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| Shield of Armature of Multi-Stage Synchronous Induction Coil Launcher Internal High Magnetic Field and Optimization |
| Guan Shaohua, Guan Xiaocun, Guo Denghua, Wang Shuai |
| National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan 430033 China |
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Abstract The problem to be solved in this paper is the internal magnetic field distribution of armature of multi-stage synchronous induction coil launcher(SICL) and shielding optimization. Firstly, this paper analyzes magnetic induction intensity distribution and electromagnetic performance when armature is not shielded during launching. The shielding effectiveness of shielding body and electromagnetic performance under different thicknesses were respectively compared using a single layer of conductive and magnetic material and combination of three-layers. Finally, the combined shielding scheme was optimized at different locations and thicknesses. Simulation results show that the shielding effectiveness of single-layer conductive materials is better than permeability magnetic materials under strong magnetic induction intensity, it opposites when under weak magnetic induction intensity. The shielding effectiveness is better when shield body is located at in front of armature. Finally, the optimization scheme that using combination of 0.5mm copper, 0.5mm copper, 2mm steel 1008 and location of shield is in front of armature is proposed. Magnetic induction intensities before and after shielding are 0.3303T and 0.1552T, the shielding effectiveness is 6.560dB.
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Received: 14 November 2019
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2020, Vol. 35 
