Improving the efficiency of magnetic coupling energy transfer byetching fractal patterns in the shielding metals

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 ed...

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Bibliographic Details
Published in:信息与电子工程前沿：英文版 2016, Vol.17 (1), p.74-82
Main Author: Qing-feng LI Shao-bo CHE Wei-ming WANG Hong-wei HAO Lu-ming LI
Format: Article
Language:English
Subjects:
coupling
current,Magnetic
energy
Fractal
pattern,Metal-layer-shield,Eddy
transfer
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Summary: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 ctwrents 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. Further- more, 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.
ISSN:2095-9184
2095-9230