基于FeSiB/PZT-82/FeSiB磁电复合材料的分芯闭环电流传感器研究

Split-core Closed-loop Current Sensor Based on FeSiB/PZT-82/FeSiB Magnetoelectric Composite

文中提出了一种分芯闭环磁电电流传感器,其由高磁导率、低磁滞的FeSiB/PZT-82/FeSiB磁电复合材料、3块硅钢磁芯和一对永磁体组成。为了实现磁电电流传感器的开合式安装,文中采用了分芯磁芯结构;载流导线产生的环形磁场经3块硅钢磁芯汇聚到FeSiB/PZT-82/FeSiB磁电复合材料,然后基于复合材料的磁-力-电多场耦合效应,实现载流导线电流传感。通过仿真和实验对比分析,分芯磁芯结构的磁场汇聚效应对FeSiB/PZT-82/FeSiB传感性能具有显著的提高。含有磁芯结构的分芯闭环磁电电流传感器在无源情况下,对工频(50 Hz)电流的测量灵敏度达到17.379 mV/A,约为无磁芯FeSiB/PZT-82/FeSiB磁电复合材料的35倍;在0~10 A测量范围内,具有良好的线性关系。结果表明:由于该传感器的优异性能和分芯闭环结构,其在工频小电流监测领域具有广阔的应用空间。

This paper proposed a split-core closed-loop magnetoelectric current sensor consisting of FeSiB/PZT-82/FeSiB with high permeability and low hysteresis,three silicon steel magnetic cores and a pair of permanent magnets.In order to realize the open-close installation,the split-core structure was adopted in this paper.A vortex magnetic field generated by the current-carrying wire was concentrated to the FeSiB/PZT-82/FeSiB magnetoelectric laminate through three silicon steel magnetic cores,and then based on multi-field coupling effect,the current sensing of the current-carrying wire was realized.Through the comparative analysis of simulation and experiment,the magnetic field convergence of the split-core structure significantly improved the sensing performance of FeSiB/PZT-82/FeSiB.The split-core closed-loop magnetoelectric current sensor has a measurement sensitivity of 17.379 mV/A to the applied power frequency(50 Hz)current under passive conditions,which is about 35 times that of the laminated open-loop FeSiB/PZT-82/FeSiB current sensor.In the range of 0~10A,it demonstrates a good linear relationship.Due to its excellent performance and split-core closed-loop structure,the results show that the sensor has a wider application in the field of power frequency weak current monitoring.