Structural Design And Thermal Simulation Analysis Of Coupling Coil For Electric Vehicle Wireless Charging System

The wireless energy transmission method avoids the drawbacks in the process of energy transmission of electric vehicles by traditional methods,and has gained more and more attention and importance because of its flexibility and safety advantages.As the core component of the wireless charging system,the coupling coil plays a key role in energy transmission.Since the system is located in a small space and the coil works for a long time,the temperature is too high,which reduces the transmission performance of the system,therefore,the thermal analysis of the coupling coil is of great importance.This paper introduces the basic principle of the system and the theoretical basis of the thermal analysis of the coupling coil.A wireless charging system with the basic topology of series-connected series connection as the core is established,and the influence of important parameters such as the coil internal resistance and mutual inductance coefficient on the transmission performance in the system is analyzed.By considering the coupling coil as a heat source and the perspective of heat transfer and dissipation,the surface temperature of the coupling coil is analyzed,and the selection of materials used for the coupling coil and the structural design are carried out.Finally,the effect of material and shape on the temperature distribution on the coil surface is discussed through thermal simulation analysis.The main work of this paper is as follows:1.The influence of materials on the thermal stability of the system is studied,and the influence of different materials on the temperature of the coupling coil in the system is analyzed to establish the temperature field distribution.The use of gold,silver and copper to make coupling coils is conducive to the transmission of energy,taking into account the price of the material,the ease of production and other factors,the choice of copper material for the production of coupling coils suitable to achieve effective operation of the system,and the temperature within the normal range.2.The influence of coil shape design on the thermal stability of the system is studied,and the influence of different shapes such as flat rectangle,flat circle and cylindrical shape on the heat dissipation of the system is analyzed to explore the temperature distribution of coils with different structures.After simulation experiments,it is learned that the coupling coil shape is designed as a flat circle with a certain interval between turns,which helps heat dissipation and thus is conducive to system energy transfer.3.To study the effect of forced heat dissipation on the coupling coil,a fan device is used next to the coupling coil for forced heat dissipation,which can effectively reduce the system temperature and help improve the efficiency of the system.Through the theoretical study and simulation experimental analysis of the system,to improve the transmission efficiency of the system,so the material used in the coupling coil in the system is selected as copper,and the shape is designed as a flat circle with a certain distance between turns,which helps heat dissipation,and then the introduction of forced heat dissipation and other methods can better take away part of the heat,reduce the system temperature,which is conducive to the better work of the system.