Performance Assessment of Coil Structures for Wireless Charging in Underwater Vehicles

Due to the advancement of technology and innovation in the transportation sector, wireless power transmission systems have gained importance for charging infrastructure. Wireless charging efficiency relies on the air gap between the coils, compensation methods, and coil design. This paper illustrates a comparative analysis of the different structures of the transmission and receiving coil in various mediums such as ferrite, air, fresh water and seawater, keeping the coil's number of turns constant for both the coils. The performance of the coils is evaluated using finite element analysis (FEA) based simulation software, with a focus on underwater vehicles under seawater medium. The performance of parameters such as self-inductance of the coil, mutual inductance of the coil, magnetic flux density and coupling coefficient are compared. It is found that the circular-shaped coil provides better performance in comparison with rectangular coil structures.