基于电磁辐射的严重危害性,探索有效的电磁屏蔽方案,已经成为当前国际上迫切需要解决的问题.本文根据高磁导率铁材料和高温超导材料的电磁屏蔽特性,利用Ansoft Maxwell 3D仿真软件,建立高磁导率材料铁空心圆柱体和高温超导材料YBCO空心圆柱体及其组合的屏蔽模型,对一个空心线圈产生的磁场进行被动磁屏蔽.仿真研究了铁屏蔽体和超导屏蔽体厚度和高度对低频磁场磁屏蔽效能的影响.仿真结果表明,YBCO /Fe组合结构的屏蔽体对低频交变磁场的磁屏蔽效能比单层YBCO屏蔽体的屏蔽效能高3倍,YBCO /Fe组合结构的屏蔽体对低频交变磁场的磁屏蔽效能比单层铁屏蔽体的屏蔽效能高1.5倍,最理想磁屏蔽体结构是YBCO/Fe二层组合结构,其具有最高的磁屏蔽效能.综合利用高磁导率材料和高温超导材料等电磁屏蔽材料的特点,选择最优电磁屏蔽方案,进行电磁屏蔽新技术研究,以提高电磁屏蔽效能,对电磁兼容问题的解决具有重要的理论和应用意义.
Base on the electromagnetic radiation having negative effects,it is the urgent international issue to be addressed that develop more and more efficient magnetic shielding solutions.A three-dimensional finite element method (FEM) analysis is performed to evaluate the magnetic characteristics of the cylindrical shell immersed in a steady uniform magnetic field generating by the copper coil on the iron core.The shielding properties of the high permeability material and the superconducting material are studied.The analysis was performed to investigate the potential of magnetic shielding of systems with the thickness and height aspect ratio exploiting the opposite magnetic properties of ferromagnetic materials and superconductor.The results of simulation indicate the hybrid YBCO/Fe structure gives shielding factors up to more than 3 times higher than those of the YBCO cylinders alone in the low frequency,the hybrid YBCO/Fe structure gives shielding factors up to more than 1.5 times higher than those of the iron cylinders alone in the low frequency.The most ideal one of such structures is the YBCO/Fe structure,which has the highest shielding factors.The problem of optimal magnetic shielding method for different magnetic shielding materials such as the high permeability material and the superconducting material is to be solved.The new technologies are explored for improving the efficiency of the magnetic shielding,which has important theoretical and applied significance for the electromagnetic compatibility problem to be solved.
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