Phenomenon Analysis and Improvement of Magnetic Shield Fringe Effect on Wireless Power Transmission of EV

An increment of magnetic field strength inevitably appears at the shield edge if a is made soft material, and that becomes more serious this combined with chassis an electrical vehicle (EV). This phenomenon caused by fringe effect, which limits transfer efficiency coupler for wireless power transmission (WPT) systems EV. phenomenon, its relationships some parameters, are analyzed in paper, these fitted to estimate different structures. A structure reduce improve herein proposed. The effectiveness correctness fitting curves advantages proposed demonstrated finite element analyses results.