Research On Effect Of Metal Environment On The Magnetic Coupling Resonant Wireless Power Transfer System

In recent years,wireless power transfer technology has been widely used,but in practical applications,the presence of metal materials around the system caused the system to change the electromagnetic parameters of the system,so the efficiency of wireless power transfer system could be affected.In order to study the transfer performance of the wireless power transfer system under different metal environments,this paper deduces the transfer efficiency model of the magnetically coupled resonant parallel-parallel structure according to the field-path model in the presence of metal materials.On the basis of this,the main factors of influencing the system are analyzed,and the change of inductance parameters,electromagnetic shielding effect,magnetic field intensity distribution,eddy current loss effect of metal-free environment in different metal environment are also analyzed by electromagnetic field simulation software.The simulation results show that the system transfer efficiency trends.It is proved that the ferromagnetic iron and nickel can effectively restrain the magnetic field extension of the surrounding space of the coupling coil,and have certain electromagnetic shielding effect.At the same time the self-inductance and mutual inductance of the coupling coil are increased and the degree of coupling is improved,that lead to system detuning andtransfer efficiency is reduced.