Design of coupling mechanism for dynamic wireless power transfer system

Coupling mechanism is the key link of energy transfer in wireless power transfer system, and the design of its parameters will affect the system's efficiency. In this paper, by analyzing the efficiency characteristics of the system under LCC/S topology, mutual inductance is taken as the index of coupling mechanism design. Taking the double-D-shaped coupling coil as the research object, the long primary side and short secondary side coil model suitable for moving conditions is established. The influence of the length / width, wire diameter and line spacing of the secondary side coil on mutual inductance is analyzed, and the laying mode of the core is designed. According to the analysis of the simulation results, the design scheme of the coupling mechanism is determined: the length of the secondary side coil is 850mm and the width is 700mm; the primary side core is laid in the middle of the coil; the loss density of the secondary side core is reduced by increasing the thickness of the core partially. The relevant conclusions are verified by experiments.