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CLC number: TN99

On-line Access: 2016-01-05

Received: 2015-04-09

Revision Accepted: 2015-08-05

Crosschecked: 2015-12-08

Cited: 1

Clicked: 2055

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Qing-feng Li

http://orcid.org/0000-0002-8827-8511

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Frontiers of Information Technology & Electronic Engineering  2016 Vol.17 No.1 P.74-82

10.1631/FITEE.1500114


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


Author(s):  Qing-feng Li, Shao-bo Chen, Wei-ming Wang, Hong-wei Hao, Lu-ming Li

Affiliation(s):  1School of Aerospace, Tsinghua University, Beijing 100084, China; more

Corresponding email(s):   lqf05@mails.tsinghua.edu.cn, lilm@tsinghua.edu.cn

Key Words:  Fractal pattern, Metal-layer-shield, Eddy current, Magnetic coupling energy transfer


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Qing-feng Li, Shao-bo Chen, Wei-ming Wang, Hong-wei Hao, Lu-ming Li. Improving the efficiency of magnetic coupling energy transfer by etching fractal patterns in the shielding metals[J]. Frontiers of Information Technology & Electronic Engineering, 2016, 17(1): 74-82.

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pages="74-82",
year="2016",
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doi="10.1631/FITEE.1500114"
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Abstract: 
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.

The paper investigated fractal patterns for eddy current suppression and efficiency improvement. Both of simulations and experiments are detailing presented. It is a high quality paper overall.

基于分形图案蚀刻屏蔽金属提高磁耦合能量传输效率

目的:针对磁耦合能量传输中屏蔽金属的涡流效应导致传输效率降低的问题,提出一种可有效抑制金属涡流效应的方法,从而提高能量传输效率。
创新点:提出在屏蔽金属上蚀刻具备分形特征的几何图案的方法。该方法改变了磁耦合能量传输中金属表面的涡流分布,有效抑制了其涡流效应,能量传输效率接近无金属介质时的水平。
方法:首先,利用电磁仿真方法建立模拟层状金属屏蔽的磁耦合能量传输模型(图1)。基于仿真模型找出可有效抑制涡流效应的蚀刻图案的特征。其次,在满足这些特征的条件下,提出并比较几种不同分形图案(图4)蚀刻金属后的能量传输性能,选择性能最好的图案(图4g)计算其频率响应,并探讨其抑制涡流效应的机制。然后,仿真研究了多层金属应用背景下,采用分形图案蚀刻金属以提高传输效率的方法。最后,建立仿真模型对应的实验平台,对可有效抑制金属涡流效应的图案特征,以及多层金属应用下用分形图案蚀刻方法抑制涡流效应的结果进行实验验证。
结论:针对磁耦合能量传输中普遍存在的层状金属应用环境,提出了采用分形图案蚀刻金属的方法,有效抑制了金属涡流效应,提高能量传输效率。

关键词:分形几何;层状金属屏蔽;涡流效应;磁耦合能量传输

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