Finite-Width Magnetic Mirror Models of Mono and Dual Coils for Wireless Electric Vehicles
Finite-Width Magnetic Mirror Models of Mono and Dual Coils for Wireless Electric Vehicles
复制标题
DOI：
10.1109/tpel.2012.2206404
复制
发表时间：
2013-03-01
影响因子：
6.7
通讯作者：
Rim, C. T.
中科院分区：
文献类型：
--
作者：
Lee, W. Y.;Huh, J.;Rim, C. T.
本文提出了具有有限宽度和无限磁导率的单线圈和双线圈的改进磁镜模型（IM3）。通过引入与源电流距离相同但幅度小于源电流的镜像电流，可以以闭合形式确定单线圈和双线圈的磁通密度。镜像电流和源电流的比率被确定为芯板的宽度以及源电流和芯板之间的距离的函数，如从有限元方法模拟严格导出的。将所提出的 IM3 应用于无线电动汽车的单线圈和双线圈，分析开放磁芯板上的磁通密度并找到其在板上的最大值点，这对于线圈设计以避免局部磁饱和至关重要。此外，还通过引入连续镜像电流来分析当拾取芯板定位在主芯板上方时的磁通密度。所提出的磁镜模型经过实验和现场测试的广泛验证，显示出相当有前景的实际用途。
Improved magnetic mirror models (IM3) for mono and dual coils with a finite width and infinite permeability are proposed in this paper. By introducing a mirror current, which is located at the same distance from a source current but with a smaller magnitude than the source current, the magnetic flux density of the mono and dual coils can be determined in a closed form. The ratio of the mirror current and source current is identified as a function of the width of the core plate and the distance between the source current and core plate, as rigorously derived from finite-element method simulations. Applying the proposed IM3 to the mono and dual coils used for wireless electric vehicles, the magnetic flux density over an open core plate is analyzed and its maximum points on the plate are found, which is crucial in the design of the coils to avoid local magnetic saturation. Furthermore, the magnetic flux density when a pick-up core plate is positioned over a primary core plate is also analyzed by introducing successive mirror currents. The proposed magnetic mirror models were extensively verified by experiments as well as site tests, showing quite promising practical usefulness.