摘要
针对电动汽车无线充电系统耦合系数小、充电效率偏低的问题,提出一种可提高耦合系数的磁芯设计优化方法。根据相关电路和磁路模型,给出了耦合系数与输出功率和效率的关系,推导了单圆形线圈和DD(double-D)形线圈的耦合系数的磁路表达式,为磁芯结构设计及优化提供依据。给出了一种磁芯结构的设计优化流程,并根据流程提出了单圆形线圈的车轮形优化磁芯结构和DD线圈的凹形优化磁芯结构。三维有限元仿真和实验结果表明:在同样的线圈面积下,优化的磁芯结构对耦合系数有10%~30%的提升。采用优化磁芯结构的无线充电系统,与原充电系统对比,充电效率明显提升。
Aiming at tlie problem that low coupling coefficient of EV wireless charging system always leads to low charging efficiency,a metliod improving the coupling coefficient by design and onetic core was proposed. The equations about output power and Ciciency were derived flent circuit, and the expressions about coupling coefficient were obtained by analyzing the equivalentmagnetic circuit diagrams,which provide the basis for optimizing magnetic core structures for bot!i singlecoil and double coil couplers. Then a process of design and optimization of magnetic cand following the process a wheel-siiaped core structure was designed for circular coil and a concave corestructure was proposed for Double-D（ DD） coil. The 3D FEM simulation and experimental rthat the optimized core structure has a 10k -3 0 k improvement in the coupling coefficient. Compared with the original charging system,charging efficiency of the wireless charging system using the optimized core structure is improved significantly.
出处
《电机与控制学报》
EI
CSCD
北大核心
2018年第1期8-15,共8页
Electric Machines and Control
基金
国家自然科学基金(61403236)
关键词
磁芯结构
设计优化
磁搞合机构
耦合系数
电动汽车无线充电
magnetic core structures ＆ design and optimization
magnetic couple r
coupling coefficient
EV wireless charging
