Abstract Realization of high efficiency and long transmission range in high-frequency wireless power transfer (WPT) systems has always been hindered by the increased resistance due to the eddy current loss occurring in the inductive coils. In this study, multi-walled carbon nanotube-coated copper (MWCNT-Cu) coils are successfully introduced to address this limitation by implementing the frequency-inert MWCNT channels along with using their high-surface areas to realize the electromagnetic shielding of the Cu substrate through multiple reflection mechanisms. At a frequency of 15 MHz, the resistance of the individual MWCNT-Cu coil was reduced to less than 40% of its original value for primitive Cu, leading to more than a four-fold increase in their quality factor. When MWCNT-Cu coils were used as the transmitting component, the transmission efficiency of the WPT system increased from 10.57% to 95.81% at a transmission distance of 4 cm and a frequency of 3.45 MHz. Finally, it was demonstrated that the loss reduction improved as the eddy current loss became more severe in coils with higher inductance values, which makes this approach promising for significantly improving the performance of inductive components in WPT applications.

中文翻译：

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用于减少无线电力传输系统损耗的多壁碳纳米管涂层螺旋线圈

摘要 在高频无线电力传输（WPT）系统中实现高效率和长传输范围一直受到电感线圈中涡流损耗导致电阻增加的阻碍。在这项研究中，多壁碳纳米管涂层铜 (MWCNT-Cu) 线圈被成功引入，通过实施频率惰性 MWCNT 通道以及利用其高表面积实现铜基板的电磁屏蔽来解决这一限制通过多种反射机制。在 15 MHz 的频率下，单个 MWCNT-Cu 线圈的电阻降低到原始 Cu 原始值的 40% 以下，导致其品质因数增加了四倍多。当使用 MWCNT-Cu 线圈作为发射元件时，WPT系统在传输距离为4cm、频率为3.45MHz时的传输效率从10.57%提高到95.81%。最后，证明了随着涡流损耗在具有较高电感值的线圈中变得更加严重，损耗降低得到改善，这使得该方法有望显着提高 WPT 应用中电感组件的性能。