Wireless Power Transmitting Coil Achieving Uniform Magnetic Flux Density Distribution

This paper proposes a transmitting coil with uniform magnetic field distribution by specifying the outer diameter of the transmitting coil and magnitude of the magnetic flux density. The proposed transmitting coil features a structure in which the lines in the outer part of the coil have equal spacing, while in the central region, the spacing between lines decreases as they approach the outer edge. Using a deep neural network trained on the relationship between the coil’s structural parameters, coefficient of variation (CoV) of the magnetic flux density, and magnitude of the magnetic flux density, enables the determination of an optimal transmitting coil structure. The experimental results indicate that the proposed coil exhibits consistent mutual inductance and coupling coefficient regardless of the misalignment of the receiving coil.