Research On The Coupling Coefficient Of The Electro Magnetic Structure In Wireless Power Transmission System

It is easy to see that conventional methods of power supply are almost direct electrical contacting mode. These methods are obviously not fit for the development of society.With the resent development of power electronics, the research and production of electric devices is undergoing a profound reform. WPT(Wireless Power Transfer) system is a coalition of modern power electronics, magnetic coupling technology, high power-high frequency convert technology (including resonant transfer and Electro Magnetic Compatibility technology, etc) and modern control theory and methods. It overcomes disadvantages of traditional power transfer system, It’s a new way of power transfer.Firstly, in this paper, research status and products of wireless power transfer are briefly introduced both in China and abroad. The principle of WPT, basic structure and function of each part are analyzed. Secondly, The classification and characteristic of the electro magnetic structure in WPT system are briefly introduced, and the characters of the structure are analyzed particularly, including material of magnetic core, material of coil, magnetic circuit model. The inductive coupling of the electro magnetic structure about U structure is researched with the Maxwell 2D simulating software. The simulation plan is properly made. At last, the factors affected the mutual inductive coupling are researched particularly, such as magnetic material of the coil, distance of two sides, lateral distance etc, which provides the theory and practice gist to the optimized design to WPT system.