Improvement of the Power Transfer Efficiency of a Dynamic Wireless Power Transfer System via Spatially Distributed Soft Magnetic Materials

The improvement of misalignment tolerance and average efficiency are key elements for the commercialization of Dynamic Wireless Power Transfer (DWPT) systems. This paper addresses both topics by employing the approach of a spatially distributed arrangement of soft magnetic materials on the secondary side to reduce the overall reluctance of the Wireless Power Transfer (WPT) system under consideration. The Vehicle Assembly (VA), which is based on a SAE J2954/1 magnetic design, is equipped with a three-dimensionally arranged soft magnetic structure that improves the coupling in longitudinal and transversal direction. Low-voltage tests are performed for aligned and misaligned conditions, which confirm the effectiveness of the proposed approach for both design targets.