The wireless power transmission（WPT）coil of the electric vehicle includes a coil itself

a coil tray and a ferrite.The ferrite magnetic sheet placed outside the vertical direction of the transmitting and receiving coils has an effect of increasing the transmission distance and the transmission efficiency of the electric vehicle wireless charging system.In order to realize the design of ferrite magnetic sheet

taking the 7.7 kW WPT receiving coil as an example

establishing its finite element model in finite element analysis software ANSYS.Simulation study on the change of coil parameters under the variation of ferrite magnetic sheet parameters by controlled variable method

analyze the characteristics of the parameters of the coil and the constraint relationship between them

the overall design basis for the ferrite magnetic sheet of the wireless energy transmission coil is given

Finally

based on the analysis results

build a physical model to verify.It is found that when the coil size is determined

the transmission power of the system can be up to 7.7 kW and the transmission efficiency is up to 93.5 % after the designed ferrite magnetic sheet is added.