基于磁电复合材料的开合式电流传感器磁芯仿真分析

Simulation analysis of magnetic core of current sensor based on magnetoelectric composite

基于磁电材料的电流传感器设计中,为了提高传感器的精度和灵敏度,通常会采用磁芯来汇聚磁场。基于有限元软件分别对交叉结合面开合式磁芯和平口结合面开合式磁芯中的磁致伸缩层磁感应强度进行了仿真分析。同时,分析了气隙和电流导线位置对不同结合面中磁致伸缩层磁感应强度的影响。根据仿真结果,当气隙距离为0.5 mm时,交叉结合面磁芯中的磁致伸缩层磁感应强度为气隙距离为零时的95.5%,而平口结合面磁芯中的值仅为气隙为零时的4.62%;当导线位置沿着x方向(平行于磁致伸缩层长度方向)一定范围内偏移时,交叉结合面和平口结合面磁芯内的磁致伸缩层的磁感应强度最大误差分别为0.02%和2.71%,当导线位置沿着y方向(垂直于磁致伸缩层长度方向)一定范围内偏移时,最大误差分别为0.33%和8.19%。因此,交叉结合面开合式磁芯更适合作为开合式电流传感器磁芯。

In the design of current sensor based on magnetoelectric materials, the magnetic core is usually used to converge the magnetic field for improving the accuracy and sensitivity of the sensor. Based on the finite element software, the magnetic induction intensity of the magnetostrictive layers in the cross joint surface of opening magnetic core and the flat joint surface of opening magnetic core is simulated and analyzed in this paper. At the same time, the effects of air gap and current conductor position on the magnetic induction intensities of magnetostrictive layers in different joint surfaces are analyzed. According to the simulation results, when the air gap distance is 0.5 mm, the magnetic induction intensity of the magnetostrictive layer in the cross junction core is 95.5% of that when the air gap distance is zero. The value in the flat junction core is only 4.62% when the air gap is zero. When the wire position is offset in a certain range along the X direction(parallel to the length direction of the magnetostrictive layer), the maximum errors of the magnetic induction intensity of the magnetostrictive layer in the magnetic core of the cross junction surface and the junction surface are 0.02% and 2.71% respectively. When the wire position is offset in a certain range along the Y direction(perpendicular to the length direction of the magnetostrictive layer), the maximum errors are 0.33% and 8.19% respectively. The simulation results show that the cross junction opening and closing magnetic core is more suitable for the opening and closing current sensor magnetic core.