Effect of Angle Offset of the Power Receiving Coil in Underwater Wireless Power Transfer Using a Cone Spiral Coil

In this study, the angle offset of the receiving coil in undersea wireless power transfer using a cone spiral coil is studied. A simulation model based on the actual measurement environment is created, and the power transmission efficiency is compared when the receiving coil tilt from 0 to 50 degrees in the vertical direction of the transmission coil surface. The power transmission efficiency in the sea is 29.9% when the transmitting coil and the receiving coil faced each other. The transmission efficiency when tilt 30 degrees and 50 degrees is 23.0% and 11.3%, respectively. The simulation results indicate that wireless power supply is possible even when the receiving coil is greatly tilt due to the influence of the tidal current in the sea.