Research And Design Of Power Transfer System Through Metal Barriers Based On Inductive Coupling

Metal has the advantages of high mechanical strength,good durability and stable physical and chemical properties in extreme environments.So metal is often used as the preferred material for isolation.However,it is a great challenge to realize energy transfer from the outside to the inside without destroying the tightness of the metal container.Inductive Power Transfer through metal barriers(IPT through metal)has many advantages,such as high safety,long life,low maintenance-cost and no pollution for the environment.In this paper,theoretical analysis and simulation and experiment research on IPT system through metal barriers are carried out.The main contents are as follows:1)Considering the contactless characteristics and the influence of eddy current,the theoretical model of the IPT system through metal barriers is established and determine the optimal operating frequency range of the system.The correctness of the frequency range is verified by simulation and physical experiments.2)In view of the superposition effect of the radiation caused by IPT alternating current and metal eddy current,the expression of magnetic flux density in space is theoretically analyzed and we can obtain the changes of direction,amplitude and phase of the magnetic field according to the expression;the finite element analysis model is established.We will study the spatial magnetic field distribution of the IPT system through metal barriers and obtain the variation characteristics and periodicity of the magnetic emission through co-simulation of Maxwell and Simplorer;the numerical relationships among coil characteristics,the spatial position and magnetic emission is analyzed.3)An IPT system through metal barriers is designed and the system test is completed.The system is divided into three parts: energy transmitted module,coupled resonant transmission module and energy received module.The circuit design requirements are analyzed,the circuit is designed and the transmission effect of the system is tested.Finally,the transmission efficiency through 5 mm aluminum plate can reach to 2.43%.