为了合理评估磁屏蔽体对低频磁场的屏蔽效果,设计了一种磁屏蔽体并提出一种屏蔽方案,计算静磁场与交变磁场共同影响下,其屏蔽装置对其屏蔽性能的影响,并通过实验来论证该屏蔽体和设计方案在实践中的应用可行性。实验结果表明,设计的电...为了合理评估磁屏蔽体对低频磁场的屏蔽效果,设计了一种磁屏蔽体并提出一种屏蔽方案,计算静磁场与交变磁场共同影响下,其屏蔽装置对其屏蔽性能的影响,并通过实验来论证该屏蔽体和设计方案在实践中的应用可行性。实验结果表明,设计的电磁屏蔽室,室内静磁场B≤200 n T,50 Hz交流磁场干扰<0.10μT;大于100 k Hz交流磁场屏蔽系数S≥1 000;满足磁传感器系统等相关仪器的实用要求,为实践屏蔽室屏效验收提供理论依据。展开更多
Thin metal sheets are often located in the coupling paths of magnetic coupling energy transfer(MCET) systems. Eddy currents in the metals reduce the energy transfer efficiency and can even present safety risks. This p...Thin metal sheets are often located in the coupling paths of magnetic coupling energy transfer(MCET) systems. Eddy currents in the metals reduce the energy transfer efficiency and can even present safety risks. This paper describes the use of etched fractal patterns in the metals to suppress the eddy currents and improve the efficiency. Simulation and experimental results show that this approach is very effective. The fractal patterns should satisfy three features, namely, breaking the metal edge, etching in the high-intensity magnetic field region, and etching through the metal in the thickness direction. Different fractal patterns lead to different results. By altering the eddy current distribution, the fractal pattern slots reduce the eddy current losses when the metals show resistance effects and suppress the induced magnetic field in the metals when the metals show inductance effects. Fractal pattern slots in multilayer high conductivity metals(e.g., Cu) reduce the induced magnetic field intensity significantly. Furthermore, transfer power, transfer efficiency, receiving efficiency, and eddy current losses all increase with the increase of the number of etched layers. These results can benefit MCET by efficient energy transfer and safe use in metal shielded equipment.展开更多
文摘为了合理评估磁屏蔽体对低频磁场的屏蔽效果,设计了一种磁屏蔽体并提出一种屏蔽方案,计算静磁场与交变磁场共同影响下,其屏蔽装置对其屏蔽性能的影响,并通过实验来论证该屏蔽体和设计方案在实践中的应用可行性。实验结果表明,设计的电磁屏蔽室,室内静磁场B≤200 n T,50 Hz交流磁场干扰<0.10μT;大于100 k Hz交流磁场屏蔽系数S≥1 000;满足磁传感器系统等相关仪器的实用要求,为实践屏蔽室屏效验收提供理论依据。
基金supported by the National Natural Science Foundation of China(No.51125028)the National Key Technology R&D Program of China(No.2011BAI12B07)
文摘Thin metal sheets are often located in the coupling paths of magnetic coupling energy transfer(MCET) systems. Eddy currents in the metals reduce the energy transfer efficiency and can even present safety risks. This paper describes the use of etched fractal patterns in the metals to suppress the eddy currents and improve the efficiency. Simulation and experimental results show that this approach is very effective. The fractal patterns should satisfy three features, namely, breaking the metal edge, etching in the high-intensity magnetic field region, and etching through the metal in the thickness direction. Different fractal patterns lead to different results. By altering the eddy current distribution, the fractal pattern slots reduce the eddy current losses when the metals show resistance effects and suppress the induced magnetic field in the metals when the metals show inductance effects. Fractal pattern slots in multilayer high conductivity metals(e.g., Cu) reduce the induced magnetic field intensity significantly. Furthermore, transfer power, transfer efficiency, receiving efficiency, and eddy current losses all increase with the increase of the number of etched layers. These results can benefit MCET by efficient energy transfer and safe use in metal shielded equipment.
