Misalignment Tolerance Of IPT Magnetic Coupler Based On High-Performance Magnetic Material

Inductive Power Transfer(IPT)technology for electric vehicles has the advantages of safety,convenience,environmental protection and high reliability compared with traditional wired power transmission.It is one of the most promising directions of electric vehicle charging technology.However,in practical applications,it is inevitable that the position of the primary and secondary coils is misalign,which will lead to a series of problems such as system efficiency decline,over-current.It hinders the engineering application of IPT for electric vehicles.Therefore,the analysis of the influence of the magnetic coupler structure and the high-performance magnetic material on the misalignment tolerance is focused on,while the key technology of improving the misalignment tolerance ability of the magnetic coupler based on the high-performance magnetic material is studied.The main work is as follows:(1)The transmission characteristics of different magnetic couplers in inductive power transfer is analyzed Finite element simulation of the changes in parameters such as mutual inductance,loss,and magnetic flux density of two coils and three coils in alignment and misalignment is established.An optimization strategy design method based on switching between two coils and three coils is proposed to improve the antimisalignment capability of the IPT system.Experimental verification is also conducted on two coils and three coils magnetic couplers at different power levels to verify that the misalignment capability can be improved effectively with three coils magnetic couplers and the optimization strategy.(2)Analyzed the influence of compensation parameters of different coils on the efficiency and power of IPT system;Compare the principles that affect IPT system with different compensation levels under misalignment.Optimize the structure of inductive power transfer magnetic coupler with a large relay coil to further improve the efficiency and anti-misalignment capability of IPT system,and verify through experiments.(3)Build a loss testing platform and combined it with finite element simulation to calculate material loss.And also conduct research on the magnetic field and transmission characteristics of IPT systems with different magnetic materials,and experimentally verified their anti-misalignment ability and loss characteristics;Magnetic field and transmission characteristics of magnetic couplers based on highperformance magnetic materials is analyzed,and experimentally verify its improvement in the efficiency and anti-misalignment ability of IPT systems;Finally,the misalignment tolerance ability of the proposed inductive power transfer magnetic coupler based on high-performance magnetic materials is validated on an actual electric vehicle platform under 5kW output power.