Abstract:To achieve high fault tolerance of wireless power transfer system during coupler offset and ensure output stability, a wireless power transfer system structure with high anti-offset performance based on dipole coils has been proposed in this paper. Firstly, a new type of dipole coil has been proposed, which has been studied using finite element method and its magnetic pole direction and structural size are optimized and analyzed. Secondly, based on the new dipole coil, the characteristics of input current, output power and efficiency of LCC-S and S-S compensation topologies were compared when the input voltage is constant. Finally, experimental researches were conducted on the new dipole coil under the same conditions of leeds-line quantity and size, compared with the square coil, the designed dipole coil has a reduction of 8.51% in coupling coefficient change rate, 11.12% in power change rate when the offset range of the X and Y axes is -60 to +60 mm, and the efficiency always greater than 80% during the offset process.