Abstract
It is necessary to take waterproof measures for the power supply coil and the power receiving coil used in undersea wireless power transfer. We have clarified the transmission characteristics of the coils in a waterproofed glass case. A spherical pressure-resistant glass is suitable for the high-water pressure of the deep sea. However, there are restrictions on the shape and size of the coil, as well as the installation location, in order to install a wireless power transfer system inside the sphere. Therefore, we could solve this problem by using a coil that is shaped along the exterior of the sphere. We call this coil the cone spiral coil. In this paper, the effect of the angular misalignment between coils on the transmission efficiency of underwater wireless power transfer using the cone spiral coil was analyzed by the finite element method and examined. The results show that the variation obtained by a conventional helical coil and the cone spiral coil was small.
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