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Wireless energy transfer based on coupled magnetic resonances is a new technology which energy can be transferred via coupled magnetic resonances in the non-radiative near-field. A simple energy transfer system structure was proposed in this paper. Based on this structure, the back electromotive force (back-EMF) in the receiving coil related with different transfer distance and with driving frequency was simulated and analyzed. Experimental results shows that the power can be transmitted is up to 50 W, the transfer efficiency is more than 60%, the distance of energy transfer is longer than 1 meter. The energy transferring is able to go through various non-metallic objects. The prospective applying fields are wide, such as EV charging, industrial robot, aerospace, wireless sensor networks, and RFID technology.