电工技术学报2025，Vol.40Issue(21)：6922-6931,10.DOI:10.19595/j.cnki.1000-6753.tces.241919
旋转无线供电系统导线洞穿金属影响抑制方法
Method for Suppressing the Impact of Wire Penetration on Metal in Rotating Wireless Power Transfer System
摘要
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.关键词
无线电能传输/旋转供电/洞穿金属影响/磁场自抑制/涡流损耗/磁热均衡Key words
Wireless power transfer/rotary supply/penetrating metal impact/magnetic field self-suppression/eddy current loss/magnetothermal equilibrium分类
动力与电气工程引用本文复制引用
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):6922-6931,10.基金项目
国家自然科学基金面上项目(52477005)、河北省燕赵青年科学家项目(E2024202109)、中央引导地方科技发展资金项目(236Z5201G)、天津市自然科学基金重点项目(22JCZDJC00620)、河北省产学研合作专项(CXY2024010)和河北省省级科技计划项目(24464401D)资助. （52477005）
