电动汽车无线充电高效高利用率磁芯的多目标优化设计  

Multi-objective Optimization Design of High Efficiency and High Utilization Magnetic Core of Wireless Charging of Electric Vehicles

作　　者：熊萌 张栋 尤国建 孙添飞 盛凯 魏学哲[2] Xiong Meng;Zhang Dong;You Guojian;Sun Tianfei;Sheng Kai;Wei Xuezhe(China Automotive Engineering Research Institute Co.,Ltd.,Chongqing 401120;New Energy Engineering Center,Tongji University,Shanghai 201804)

机构地区：[1]中国汽车工程研究院股份有限公司,重庆401120 [2]同济大学新能源汽车工程中心,上海201804

出　　处：《汽车工程》2023年第9期1740-1752,共13页Automotive Engineering

基　　金：国家重点研发计划(2022YFB2502404)资助。

摘　　要：基于电动汽车无线充电的非对称DD线圈与LCC-SP拓扑,优化设计了一种新型磁芯结构,以解决发射端磁芯的非均匀磁通所导致的磁芯高磁损耗与低利用率问题。首先,针对参考线圈组建立了其等效电路模型与等效磁路模型,分别为磁芯损耗的剥离计算与磁芯结构的排布设计提供理论支撑。同时,提出磁芯磁通均匀性的评价指标CV(B),并建立了其与磁芯损耗及磁芯体积的定量关系,为磁芯优化提供了优化方向及优化边界。然后,基于线圈组等效模型提出了新型发射端磁芯结构,并对其关键结构参数进行敏感性分析,以期减小优化变量复杂度。最后,以最大耦合系数与最小均匀系数作为优化目标,采用COMSOL与Matlab联合仿真完成了基于NSGA-II多目标优化算法的新型磁芯结构优化。结果表明,优化后磁芯利用率及效率得到改善,优化磁芯体积仅占原参考磁芯的60%,线圈传输效率提升至98.117%,磁芯损耗减小约10 W,证明了所提优化方法的有效性。In this paper,based on the asymmetric DD coil and LCC-SP topology of electric vehicle for wireless charging,a novel magnetic core structure is designed and optimized to solve the problem of high magnetic loss and low utilization of the core caused by the non-uniform magnetic flux of the transmitting core.Firstly,the equivalent circuit model and the equivalent magnetic circuit model of the reference coils are established,providing theoretical support for the calculation of magnetic core loss and the layout design of the core structure.Meanwhile,the evaluation index of magnetic flux uniformity CV(B)is proposed,and its quantitative relationship with magnetic core loss and core volume is established,providing the optimization direction and optimization boundary for the magnetic core.Then,based on the coils’equivalent model,a novel transmitting core structure is proposed,and sensitivity analysis is carried out on its key structure parameters to reduce the complexity of optimization variables.Finally,with the maximum coupling coefficient and the minimum uniformity coefficient as the optimization objectives,the novel core structure optimization based on NSGA-II multi-objective optimization algorithm is completed by the Cosimulation of COMSOL and Matlab.The results show that the utilization rate and efficiency of the optimized core have been improved,with the volume of the optimized core only 60%of the original reference core,the coil transmission efficiency increased to 98.117%,and the core loss reduced by about 10 W,which proves the effectiveness of the proposed optimization method.

关 键 词：无线充电 磁通均匀性 新型磁芯结构 多目标优化 

分 类 号：U491.8[交通运输工程—交通运输规划与管理] TM910.6[交通运输工程—道路与铁道工程]