Study on distribution characteristics of wireless charging system coupling mechanism

Abstract

Coupling mechanism is one of the key issues in the research of electric vehicle wireless charging system. Single D and DD are two kinds of coupling mechanism commonly used in wireless charging system, and spatial magnetic field distribution are different depending on the coupling mechanism. In this paper, the expressions of magnetic flux density at any point in a single D and DD were derived. A 3D magnetic field measurement platform was built and the magnetic field distribution was drawn. The experimental results show that in the primary test, single D type magnetic induction intensity is 1.18 times of DD type, with the increase of the transmission distance, DD type coupling mechanism of magnetic induction intensity attenuation is slow, and on the secondary side of DD type magnetic induction intensity is 1.12 times of D type.