Experimental Verification for Wireless In-Wheel Motor using Synchronous Rectification with Magnetic Resonance Coupling

A new type of in-wheel motor, which receives electric power by wireless power transfer using magnetic resonance coupling and control signals by wireless communication, thus eliminating completely the need for power and signal cables, have been developed. This system is called Wireless In-Wheel Motor (W-IWM). The overall efficiency of W-IWM system has been subject to considerable improvement. In particular, burst fire control was applied to previous generation W-IWM to keep the wheel driving stable. This control made use of asynchronous rectification, resulting in glitches in the controlled variables when the system commutates between motoring and regeneration, due to wireless signal delay. To achieve more efficient control and smooth energy reversal, this paper proposes a novel control method for W-IWM driving by using an application of synchronous rectification. The experimental results of test bench shows the effectiveness of the proposal.