基于Halbach效应的磁屏蔽无线输电耦合机构研究OA北大核心

Aimed at problems such as the setup of an additional excitation source required by active magnetic shielding and the expensive magnetic shielding materials used in passive magnetic shielding,a wireless power transmis-sion(WPT)coupling mechanism with magnetic shielding based on Halbach effect is proposed on the basis of the tradi-tional DD coil structure.First,the topology of WPT coupling mechanism with magnetic shielding effect is proposed,and the principle for the magnetic shielding effect is analyzed theoretically based on the corresponding equivalent magnetic circuit model.Second,the expression for the magnetic field intensity of the coupling mechanism on any plane in the space is derived using the micro-element method.Finally,an experimental platform was built to verify the WPT perfor-mance and magnetic shielding effect of the proposed coupling mechanism.Results show that the Halbach effect coil can effectively weaken the magnetic field intensity outside the coupling mechanism and improve the magnetic shielding ef-fect while ensuring that the power transmission efficiency is basically the same as that of the DD coil.