Design of magnetic coupling mechanism for wireless power transmission system based on magnetic flux analysis

Abstract

Aiming at the wireless charging system that can dynamically change arbitrarily in a three-dimensional space such as a smart robot, this paper proposes a new type of magnetic coupling mechanism that combines a disc coil and a spiral coil. It can not only avoid frequency splitting in the short-distance range, but also effectively enhance the coupling strength in the long-distance range. In addition, it can also effectively improve the position robustness and anti-offset ability of the robot’s wireless charging system. In this paper, the geometric framework of the new magnetic coupling mechanism is first given. Based on the analysis of magnetic flux, it is theoretically confirmed that the magnetic coupling mechanism can reduce the coupling strength in the near range, avoid the frequency splitting phenomenon, and improve the coupling strength of the system and the energy efficiency of the system in the long range. Finally, based on the finite element simulation software COMSOL, it is proved that the proposed magnetic coupling mechanism can achieve high energy efficiency output in a large range, and has strong position robustness and anti-deviation.