穿透金属无线能量传输系统磁场辐射特性分析

The Analysis of Magnetic Emission Based on Inductive Power Transfer through Metal Barriers

在通过电感耦合方式穿透金属的无线能量传输(IPT)中,线圈中的交变电流与金属障板的涡流协同作用,在空间产生较强的磁场辐射。针对一种穿透非铁磁性铝板的无线能量传输系统,首先理论分析出空间中磁感应强度表达式并根据表达式得到磁场方向、幅度和相位变化情况。然后建立有限元分析模型,通过Maxwell和Simplorer联合仿真,研究上述穿透金属IPT系统空间磁场分布,得到磁场辐射变化特性和周期性。最后详细分析了线圈特性及空间位置与磁场辐射的数值关系并得出结论。

The alternating current in the coils cooperating with the eddy current of the metal barriers will generate strong magnetic emission in space when we use the inductive power transfer(IPT)system through metal barriers.In this paper,an IPT system through aluminum plate is established.Firstly,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.Then 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.Finally,the numerical relationships among coil characteristics,the spatial position and magnetic emission are analyzed in detail and a conclusion is drawn.