Design Method of Primary Transmitting Coil for Realizing Large Uniform Magnetic Field Distribution

Abstract

In view of the problems existing in the existing wireless charging technology, this paper focused on the anti-offset performance of the charging area and system. Based on the principle of electromagnetics, the current density formula which can generate the uniform axial magnetic field strength was calculated, and the current density of the coil surface was combined, A new coil structure and a primary transmitting coil design method capable of realizing large uniform magnetic field distribution were proposed. The transmitting coil was systematically modeled by the COMSOL5.3 RF module and its axial spatial magnetic field strength and uniformity were simulated and analyzed, and multiple coil stitching superposition methods were further determined. The multi-dimensional visual electromagnetic measuring device was used to scan the axial magnetic field intensity of the primary transmitting coil surface, and compared with the simulation data, it was proved that the magnetic field distribution of the large primary transmitting coil formed after the splicing and superposition met the uniformity requirement.