Dynamic WPT Transmitting Through Fiber-Belt Tire and CFRP Wheel to In-Wheel Arc-Shaped Coil

Dynamic wireless power transfer (WPT) can solve the short cruising range problem of electric vehicles; moreover, it makes electric vehicles more efficient due to reducing heavy battery of electric vehicles. However to be stopped transmission of dynamic WPT by foreign matter objects is one of the major problems of dynamic WPTs. Prevention of the entry of foreign objects between the transmitter and receiver coils is the best method to increase the opportunity WPT and energy of WPT. This article aims to propose a new WPT system named in-wheel coil, which can prevent foreign objects by power transfer through tire and wheel, and also proposes its suitable materials and design. The nonmetal materials of wheels and tires for the proposed system are evaluated by actual measurement with small evaluation equipment; hence, the suitable materials that decrease WPT efficiency hardly are proposed. The proposed system is also evaluated by full-scale model with power transfer test. In addition, the mutual inductance model of arc-shaped coil, which can minimize airgap between the transmitter coil and the receiver coil.