Research on Grid Positioning Strategy of Coupling Mechanism in Wireless Charging System With Offset Angle Variable

The precise positioning of receiving and transmitting coils of the wireless power transmission system is the precondition for its efficient operation, and it is necessary and indispensable in practice. The novel grid positioning model and algorithm of four pick-up coils with angles is established by adding the deflection angle of the receiving coil. The corresponding relationship between space magnetic field and pickup coil voltage is analyzed, and the method of magnetic field reconstruction is studied in this article. Then, considering the sampling workload and effectiveness of pick-up coil voltages at grid point, the pick-up coil voltages were reconstructed and expanded based on variable slope interpartition sampling and Kriging interpolation, to increase the positioning database. It is found that the positioning accuracy of receiving coil can be improved with the grid sampling interval density increasing, or by using variable slope sampling while the number of grid sampling is unchanged. Under the grid sampling interval of 2.5 cm, the average positioning error of the system is less than 1 cm in this article, and the experimental results are basically consistent with the theoretical results, and the validity of the proposed approach is verified.