Basic Study of Transmitting Power Control Method without Signal Communication for Wireless In-Wheel Motor via Magnetic Resonance Coupling

In order to improve reliability and safety of an In-Wheel Motor, the Wireless In-Wheel Motor (W-IWM) using magnetic resonance coupling has been proposed. Transmitting power of the W-IWM is controlled by the primary inverter and the secondary converter. One of a technical issue of the W-IWM is transmitting power variation due to the load power variation and the coupling coefficient variation. In this paper, we propose feedback control method of the transmitting power on the primary side using primary voltage margin. The primary voltage margin can be measured by the primary current. The proposed method requires no signal communication between the primary side and the secondary side. The effectiveness of the proposed method is verified by simulation and experiment.