Novel square spiral Coil for achieving uniform Distribution of magnetic Field

In view of the problems existing in the existing wireless charging technology, the anti-offset performance of the charging region and the system was studied. A primary transmitting coil capable of achieving uniform magnetic field distribution was proposed. The magnetic field strength at a point on the coil axis and above the coil surface was calculated, and the surface current density of the transmitting coil was analyzed to calculate the radius of each turn of the spiral winding coil. Optimized the structure of the transmitting coil, the number of turns and the arrangement of the coils, A square spiral coil having a size of 20 cm η 20 cm and a number of turns of 11 inches was determined. The optimized square spiral coil was modeled by the software comsol5.3 RF module, and the strength and uniformity of the coil surface and axial space magnetic field were simulated. The axial magnetic field on the surface of the coil was measured by a multi-dimensional visual electromagnetic measuring device, and compared with the simulation data, it was proved that the axial magnetic field of the square spiral coil surface satisfied the uniformity requirement. (paper)