The transfer efficiency of a wireless power transfer system (WPT) is a critical and desired property for faster dynamic charging of electric vehicles, portable electronics, and battery powered medical devices. Mutual and self-inductance are two parameters that influence performance of the coil. To achieve an increase in inductance, coils are wound with more turns, therefore, making them bigger and not being able to fit into a fixed area. In this article, we have implemented a novel layered double D (LDD) coil with configuration that is optimized to create maximum constructive flux linkage between the transmitting and receiving coils. While also increasing the effective area of its parent double D (DD) coil, LDD still maintains the same lateral area. The inductances of both LDD and DD coil were measured alongside each other. LDD gave a significant increase in inductance comparison to the DD coil. Ferrite and aluminum shielding material are introduced to the coils to determine the effect on inductance. The coils had a more consistent performance when ferrite was used as a shield. By evaluating the WPT performance of various coil configurations, it was determined that the LDD coil with ferrite shield gave the best performance, making them very suitable for next generation WPT applications.

中文翻译：

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无线电力传输系统中分层 DD 线圈结构的实验评估

无线电力传输系统 (WPT) 的传输效率是电动汽车、便携式电子产品和电池供电医疗设备快速动态充电的关键和理想特性。互感和自感是影响线圈性能的两个参数。为了增加电感，线圈缠绕了更多的匝数，因此，使它们更大并且无法放入固定区域。在本文中，我们实现了一种新型分层双 D (LDD) 线圈，其配置经过优化，可在发射线圈和接收线圈之间产生最大的建设性磁通链。在增加其母双 D (DD) 线圈的有效面积的同时，LDD 仍然保持相同的横向面积。LDD 和 DD 线圈的电感是并排测量的。与 DD 线圈相比，LDD 显着增加了电感。将铁氧体和铝屏蔽材料引入线圈以确定对电感的影响。当铁氧体用作屏蔽时，线圈具有更一致的性能。通过评估各种线圈配置的 WPT 性能，确定带有铁氧体屏蔽的 LDD 线圈具有最佳性能，使其非常适合下一代 WPT 应用。