在电动汽车无线电能传输系统中,磁屏蔽效果往往以牺牲传输效率为代价,如何减少磁泄漏的同时提高传输效率是一 个难题。 为此本文提出了一种新型强耦合磁屏蔽结构来减少系统磁泄漏。 首先,提出了一种强耦合磁屏蔽线圈结构,基于提出 的屏蔽线圈结构,分析了屏蔽线圈阻抗特性对系统漏磁与传输效率的影响;其次,给出了一种漏磁优化流程,运用提出的优化流 程,得到了满足设计要求的各线圈参数;最后,根据得到的线圈参数研制了一套基于电动汽车带磁屏蔽结构的无线充电系统,通 过仿真和实验验证了所提结构与方法的有效性。 结果显示,提出的新型强耦合磁屏蔽线圈不仅使系统的磁泄漏有效降低了 28%,且传输效率提升了近 4%。
In the electric vehicle wireless power transfer ( WPT) system, the magnetic shielding effect is often at the expense of transmission efficiency. Reducing magnetic leakage and improving transmission efficiency are the difficult problems. Therefore, a new strong coupling magnetic shielding structure is proposed to reduce the magnetic leakage of the system. Firstly, a strong coupling magnetic shielding coil structure is proposed. Based on the proposed shielding coil structure, the characteristics of system magnetic leakage and transmission efficiency on the impedance of shielding coil are analyzed. Secondly, a magnetic flux leakage optimization method is given. Using the proposed optimization method, the coil parameters that meet the design requirements are obtained. Finally, according to the obtained coil parameters, a wireless charging system based on electric vehicle with magnetic shielding structure is developed. The effectiveness of the proposed structure and method is verified by simulation and experiment. The results show that the proposed new strong coupling magnetic shielding coil not only effectively reduces the magnetic induction intensity of the system by 28%, but also improves the transmission efficiency by nearly 4%.