While detection of foreign or unintended metallic objects is an important topic for wireless power transfer (WPT), operation of WPT systems with intended metallic objects is largely an unchartered territory. This article presents a methodology for analyzing the effects of intended metallic object on a WPT system through the study of the magnetic field distribution and the use of a reduced-order equivalent model of the systems for comparing the WPT system with and without the metallic object. The methodology is applied to a metallic corona ring of low resistance used with a WPT system. The analysis quantifies how an intended metallic object could change the magnetic coupling between the transmitter and receiver coils, and alter the equivalent resonant tank parameters of the WPT system. Recompensation of the resonant tank can only enhance the power transfer capability but not the energy efficiency. The theory and practical verification of a new performance-enhancement method based on a combination of recompensating the resonant tanks and maximizing the equivalent mutual inductance of the Tx and Rx coils is presented. Such methodology provides a general approach to analyze WPT systems with or without relay resonators in the presence of intended metallic objects.

中文翻译：

---

具有预期金属物体的无线电力传输系统的分析和性能增强

虽然检测外来或非预期金属物体是无线电力传输 (WPT) 的一个重要主题，但使用预期金属物体运行 WPT 系统在很大程度上是一个未知领域。本文介绍了一种方法，通过研究磁场分布并使用系统的降阶等效模型来比较有金属物体和没有金属物体的 WPT 系统，从而分析预期金属物体对 WPT 系统的影响。该方法应用于与 WPT 系统一起使用的低电阻金属电晕环。该分析量化了预期的金属物体如何改变发射器和接收器线圈之间的磁耦合，并改变 WPT 系统的等效谐振槽参数。谐振回路的补偿只能提高功率传输能力，而不能提高能效。提出了一种新的性能增强方法的理论和实践验证，该方法基于补偿谐振回路和最大化 Tx 和 Rx 线圈的等效互感的组合。这种方法提供了在存在预期金属物体的情况下分析带有或不带有中继谐振器的 WPT 系统的通用方法。