金属铝管影响下磁共振耦合线圈特性参数变化

Characteristic Parameters of Magnetic Resonance Coupling Coil under Influence of Aluminium Tube

为了探究金属物体对磁共振耦合线圈自身特性参数的影响规律,针对现有理论模型不能完全描述金属铝管对线圈特性参数影响规律的问题,构建了金属铝管影响下的磁共振耦合单线圈修正模型,对应开展了仿真与实验研究,并给出了涡电流回路映射电阻R'E和电阻修正量RC具体表达式。研究规律表明:线圈电感参数变化量△L随间隙的增大而减小;线圈电阻参数变化量△R的变化趋势与间隙相关且存在变化趋势分界点,即当铝管与线圈间隙小于10 mm时,线圈电阻参数数值相对放置于空气中是增大的;当铝管与线圈间隙达到15 mm时,线圈电阻参数数值相对放置于空气中是减小的。

In order to explore the influence of metal objects on the characteristic parameters of the magnetic resonance coupling coil,and the existing theory model can’t fully describe the influence of the aluminum tube on the characteristic parameters of the coil,the single coil correction model for magnetic resonance coupling under the influence of metal tubes is constructed. On the other hand, the corresponding simulation and experimental research are carried out,and the specific expressions of the eddy current loop mapping resistance R’Eand the resistance correction quantity RCare given. The result shows:the variation of coil inductance parametric △L decreases with the increase of the gap;meanwhile,the variation trend of coil resistance parametric variation △R and the gap have a certain relationship and a dividing point. When the gap between the aluminum tube and the coil is less than 10 mm,the value of the coil resistance parameter relative to the air is increased;when the gap between the aluminum tube and the coil reaches 15 mm,the value of the coil resistance parameter relative to the air is reduced.