Wireless Power Transmission Through Concrete Using Circuits Resonating at Utility Frequency of 60 Hz

A first attempt was made to perform wireless power transmission using circuits resonating at the utility frequency of 60 Hz. The purpose of this research is to develop a method for transmitting electrical power through concrete walls. An equation for the theoretical transmission efficiency that considers the copper and core losses was derived through equivalent circuit analysis. There is good agreement between the experimental and calculated values. The transmission efficiency was found to be strongly dependent on the shape of the magnet pole pieces. For a single flared shape, 165 W of power was transmitted over a distance of 100 mm through a concrete plate, representing a transmission efficiency of 78%. The efficiency dropped to approximately 67% for a concrete plate containing a steel frame.