1. State Key Laboratory of Smart Power Distribution Equipment and System Hebei University of Technology Tianjin 300401 China; 2. Hebei Key Laboratory of Equipment and Technology Demonstration of Flexible DC Transmission Hebei University of Technology Tianjin 300401 China; 3. School of Electrical Engineering Tiangong University Tianjin 300387 China
Abstract：Rotating wireless power transfer (WPT) systems face challenges of wires penetrate metal components in practical engineering applications, such as shifts in circuit parameters and increases eddy current losses within the metal, leading to localized overheating and reduced long-term operational safety. Existing mitigation methods suffer from limitations in high-frequency applications, mechanical durability, or spatial constraints. This study main aims to propose and validate a bidirectional multi-core transmission line structure to suppress magnetic field intensity near metal perforations, thereby reducing eddy current losses and thermal effects while maintaining system efficiency. Firstly, the impact factor of conventional bidirectional wires penetrating metal on system circuit parameters and metal losses were analyzed. According to impact factor, a bidirectional multi-core transmission line structure was designed. The proposed transmission line structure is designed under the condition that the total number of individual conductors remains constant. Each of the two unidirectional conductors is divided into multiple bundles of equal strand count, and then these bundles are arranged in an interleaved pattern with opposing current directions. This configuration effectively attenuates the self-generated magnetic fields of individual conductors while enabling mutual field cancellation, thereby significantly reducing eddy current losses in metallic components. Finite element analysis was employed to simulate magnetic flux density, eddy current distribution, and temperature rise in aluminum and iron under two configurations: conventional parallel dual-wire and the proposed multi-core structure. Finally, an experimental platform was constructed to validate the simulations, measuring system transmission efficiency and temperature changes on the adjacent metal. Simulation results confirm that the proposed bidirectional multi-core transmission line structure can effectively reduce the adjacent metals' magnetic flux density, eddy current loss, and temperature rise, while also exhibiting a certain degree of magnetothermal equilibrium effect. Experimentally, the multi-core structure mitigated efficiency degradation caused by metal penetration: efficiency declined by only 0.50% (aluminum) and 0.87% (iron), outperforming the dual-wire structure's 0.92% and 2.15% drops. Temperature suppression at the monitoring point (P1) reached 11.7% for aluminum and 15.9% for iron, aligning closely with simulation predictions (maximum error: 4.88%). This study demonstrates that the critical factors for mitigating wire-penetrated metal impact are: (1) minimizing the perforation length of penetrated metals and (2) reducing the magnetic flux density within the penetration zone. Through the proposed bidirectional multi-core transmission line structure effectively suppresses magnetic flux density, further reducing penetrated metals' eddy currents and thermal impacts. By dispersing current paths and enabling magnetic self-cancellation, the method reduces magnetic coupling with adjacent metals, minimizes eddy current loss, stabilizes system resonance, and enhances transmission efficiency. Therefore, using the above methods effectively mitigates the impact of metal penetration on the rotating WPT system. Besides, the proposed method's compatibility with common metals like aluminum and iron, combined with its scalability for high-power applications, demonstrates significant engineering applicability.
魏义泽, 张献, 袁文江, 陈志鑫. 旋转无线供电系统导线洞穿金属影响抑制方法[J]. 电工技术学报, 2025, 40(21): 6922-6931.
Wei Yize, Zhang Xian, Yuan Wenjiang, Chen Zhixin. Method for Suppressing the Impact of Wire Penetration on Metal in Rotating Wireless Power Transfer System. Transactions of China Electrotechnical Society, 2025, 40(21): 6922-6931.
[1] 杨庆新, 张献, 章鹏程. 电动车智慧无线电能传输云网[J]. 电工技术学报, 2023, 38(1): 1-12. Yang Qingxin, Zhang Xian, Zhang Pengcheng.Intelligent wireless power transmission cloud network for electric vehicles[J]. Transactions of China Electro- technical Society, 2023, 38(1): 1-12. [2] 刘祺, 薛明, 章鹏程, 等. 基于无线充电系统的多模块扩展均压技术研究与设计[J]. 电工技术学报, 2024, 39(22): 6980-6989. Liu Qi, Xue Ming, Zhang Pengcheng, et al.Modular extensible voltage equalization based on wireless charging system[J]. Transactions of China Electro- technical Society, 2024, 39(22): 6980-6989. [3] 黄文聪, 饶天彪, 蒋煊焱, 等. 无线电能传输系统最大效率追踪及恒压输出复合控制方法[J]. 电工技术学报, 2024, 39(12): 3589-3601, 3615. Huang Wencong, Rao Tianbiao, Jiang Xuanyan, et al.Maximum efficiency tracking and constant voltage output compound control method for wireless power transfer system[J]. Transactions of China Electro- technical Society, 2024, 39(12): 3589-3601, 3615. [4] 周玮, 郑宇锋, 陈泽林, 等. 基于副边解耦极板的电容式无线电能传输系统拾取端失谐评估[J]. 电力系统自动化, 2024, 48(3): 142-149. Zhou Wei, Zheng Yufeng, Chen Zelin, et al.Detuning estimation of pickup loop in capacitive wireless power transfer system based on secondary-side decoupled capacitive coupler[J]. Automation of Electric Power Systems, 2024, 48(3): 142-149. [5] 程志远, 宋晓逸, 吴晓婷, 等. 无线充电系统旋转式电磁耦合器损耗计算及热点温度研究[J]. 电工技术学报, 2024, 39(7): 1932-1942, 1956. Cheng Zhiyuan, Song Xiaoyi, Wu Xiaoting, et al.Loss calculation and hot spot temperature research of rotary electromagnetic coupler in wireless charging system[J]. Transactions of China Electrotechnical Society, 2024, 39(7): 1932-1942, 1956. [6] Wang Longyang, Li Jiangui, Luo Guangbin, et al.A mixed flux coupler and dual-path parallel compensa- tion based rotating wireless power transfer system integrated with rotational speed monitoring function[J]. IEEE Transactions on Power Electronics, 2024, 39(6): 7736-7751. [7] Yuan Wenjiang, Zhang Xian, Sha Lin, et al.A method of metal interference suppression by circular internal flux for rotating wireless power supply system[J]. IEEE Transactions on Electromagnetic Compatibility, 2024, 66(3): 809-820. [8] 闫孝姮, 李洪蕾, 陈伟华, 等. 金属环境对谐振式无线电能传输系统的影响分析[J]. 测控技术, 2017, 36(12): 131-136. Yan Xiaoheng, Li Honglei, Chen Weihua, et al.Effect analysis of metal environment on magnetic resonant wireless power transmission system[J]. Measurement & Control Technology, 2017, 36(12): 131-136. [9] 钟再敏, 勾越, 秦一进. 基于MCR-WPT的电励磁同步电机研究[J]. 电机与控制应用, 2018, 45(8): 39-44. Zhong Zaimin, Gou Yue, Qin Yijin.Research on electrically excited synchronous motor based on MCR- WPT[J]. Electric Machines & Control Application, 2018, 45(8): 39-44. [10] Liang H W R, Wang Hanwei, Lee C K, et al. Analysis and performance enhancement of wireless power transfer systems with intended metallic objects[J]. IEEE Transactions on Power Electronics, 2021, 36(2): 1388-1398. [11] Huangfu Youpeng, Di Rienzo L, Wang Shuhong.Frequency-dependent multi-conductor transmission line model for shielded power cables considering geometrical dissymmetry[J]. IEEE Transactions on Magnetics, 2018, 54(3): 1-4. [12] 兰天, 冯平法, 张建富, 等. 超磁致伸缩换能器涡流损耗及温升抑制研究[J]. 机械工程学报, 2022, 58(21): 243-249. Lan Tian, Feng Pingfa, Zhang Jianfu, et al.Eddy current loss and thermal control of giant magnetostric- tive transducer[J]. Journal of Mechanical Engineering, 2022, 58(21): 243-249. [13] 佟文明, 杨先凯, 鹿吉文, 等. 双层永磁体结构高速永磁电机转子涡流损耗解析模型[J]. 电工技术学报, 2024, 39(20): 6293-6304. Tong Wenming, Yang Xiankai, Lu Jiwen, et al.Rotor eddy current loss analytical model for high-speed permanent magnet motor based on double layer permanent magnet structure[J]. Transactions of China Electrotechnical Society, 2024, 39(20): 6293-6304. [14] 亓冬. 双绞线测试技术综述[J]. 数字通信世界, 2021(3): 112-113. [15] Zhu Junjie, Hou Yafei, Nagayama K, et al.Capacity loss from localization error in MIMO channel using leaky coaxial cable[J]. IEEE Access, 2021, 9: 15929-15938. [16] Abou Houran M, Yang Xu, Chen Wenjie.Design of a cylindrical winding structure for wireless power transfer used in rotatory applications[J]. Electronics, 2020, 9(3): 526. [17] 樊群, 李永江. 高电压大电流柔性脉冲功率同轴电缆设计[J]. 电线电缆, 2024(1): 15-20. Fan Qun, Li Yongjiang.Design of flexible impulse coaxial cable with high voltage and high current[J]. Wire & Cable, 2024(1): 15-20. [18] 王奉献, 张献, 杨庆新, 等. 基于相差调控的无线电能传输系统耦合机构结构电磁力的平抑[J]. 电工技术学报, 2022, 37(1): 141-151. Wang Fengxian, Zhang Xian, Yang Qingxin, et al.Electromagnetic force suppression of the coupling mechanism structure of WPT system based on phase difference control[J]. Transactions of China Electro- technical Society, 2022, 37(1): 141-151. [19] 付启明, 易鹭, 曲德宇, 等. 变电站穿墙套管板的电磁仿真及优化方法[J]. 广东电力, 2019, 32(4): 119-124. Fu Qiming, Yi Lu, Qu Deyu, et al.Electromagnetic field simulation and optimization method for substation wall bushing plate[J]. Guangdong Electric Power, 2019, 32(4): 119-124. [20] 田淑均, 王恩德, 罗印, 等. 电缆穿墙金属套管发热影响因素及抑制方法研究[J]. 变压器, 2022, 59(3): 23-30. Tian Shujun, Wang Ende, Luo Yin, et al.Influencing factors and suppression methods study on heat generation from steel pipes of cables through walls[J]. Transformer, 2022, 59(3): 23-30. [21] 佟文明, 杜绍雨, 贾建国, 等. 基于改进复相对磁导函数的开槽轴向磁通永磁电机气隙磁场解析模型[J]. 电工技术学报, 2024, 39(24): 7700-7711. Tong Wenming, Du Shaoyu, Jia Jianguo, et al.Analytical model of air-gap magnetic field of slotted axial flux permanent magnet motor based on improved complex relative permeance function[J]. Transactions of China Electrotechnical Society, 2024, 39(24): 7700-7711.
2025, Vol. 40 
