Research on the Influence of Structural Parameters on Electromagnetic Force of Wireless Power Transfer

Due to the existence of inductive current and time-varying electromagnetic field in high power wireless power transfer (WPT) system, the coupling mechanism inevitably be affected by electromagnetic force, which has negative effects on the stability and the life of the system. The electromagnetic force of different structural systems is varied, due to the change of magnetic field. In this paper, the numerical solution of the electromagnetic force of the WPT system is presented based on Lorentz-Kelvin force density method. Then, an equivalent finite element model is built to study the influence of structural parameters on the electromagnetic force by parameterized solution, and the effects of magnetic permeability, coil turns and turn spacing on electromagnetic force are obtained, respectively. The laws are helpful for the design and the optimization of the WPT system.