Performance Research Of Magnetically Coupled Resonant Superconducting Wireless Power Transfer

In recent years,with the deepening of the research on magnetic coupled resonance wireless power transmission,that is increasingly integrated into People's Daily life.Wireless power transmission has the advantages of no cable,no space limitation of cable length,no spark caused by bad contact,or wear and temperature rising caused by friction.The transmitting and receiving coils are the core of magnetic coupled resonant wireless power transmission.However,the traditional coil with litz wire winding has poor transmission performance due to the low current density and high impedance of copper coil in radio energy transmission.If the transfer efficiency or power of wireless power transmission is lower,the wireless power transmission will cause a lot of waste of electricity.Therefore,the superconducting coil is introduced into wireless power transmission to improve the performance by taking advantage of the very small impedance and the large current-carrying density of the superconductor.First of all,this paper expounds the research background and significance of superconducting wireless power transmission,briefly introduces several main power transfer ways and working principles of wireless power transmission,and summarizes the development history and research status and superconducting technology at home and abroad of wireless power transmission.Secondly,this paper explains and analyzes the theory of radio energy transmission.Including several working principles of wireless power transmission,compensation capacitances for magnetic coupled resonance wireless power transmission with different topologies,analysis of wireless power transmission performance by coupling mode theory and circuit theory.And electromagnetic field theory and finite element analysis and simulation software COMSOL Multiphysics,and the numerical model of superconducting materials in finite element simulation.Then,the superconducting materials for infinite superconducting power transmission are selected,and the parameters such as the size and inductance of copper coil and superconducting coil are designed and calculated.Thirdly,the magnetically coupled resonant wireless power transmission which have copper transmitting coil and superconducting transmitting coil is modeled and simulated in the finite element simulation software.The magnetic field simulation around the transmitting and receiving coil is coupled with the compensation capacitance simulation of the transmitting and receiving circuit by the finite element simulation software.Then the performance of superconducting wireless power transmission,including transmission power and transmission efficiency,is analyzed and calculated.Finally,several factors affecting the transmission performance of magnetically coupled resonant wireless power transmission are analyzed.This includes the displacement of the coil,the distributed capacitance of the coil itself and the distributed capacitance between the transmitting and receiving coils.Among them,the displacement of the coil includes two displacement modes: lateral stagger and radial rotation.The combination of the two displacements can describe the coil at any position in space.A method to optimize the transmission performance of radio energy is presented in the case of coil displacement.The above analysis focuses on the magnetic coupled resonant radio energy transmission between the traditional copper coil and the superconducting transmitting coil.