面向曳引钢带缺陷检测的径向磁化电磁传感器仿真研究

Simulation of Radially Magnetized Electromagnetic Sensor for Defect Detection of Traction Steel Strip

针对曳引钢带缺陷检测提出了一种径向磁化电磁传感器,实现曳引钢带缺陷的精准检测。基于电磁耦合和高导磁材料的聚磁特性,采用有限元分析方法建立起径向磁化电磁传感器的等效模型,分析了聚磁铁芯宽度和线圈安匝数对径向磁化电磁传感器测量处磁感应强度大小的影响规律。结果表明,宽度为1 mm的聚磁铁芯具有最佳的聚磁效果,测量处磁感应强度随着安匝数增加而增大并趋于饱和;接着,选取曳引钢带断丝和磨损两类典型缺陷,进一步仿真分析了其缺陷程度与测量点处磁感应强度的映射关系,结果表明,测量点处磁感应强度随着缺陷程度增加而减小;最后,对研制的径向磁化电磁传感器进行性能测试,并将其应用于曳引钢带缺陷检测实验中,测量值与仿真值的最大相对误差为7.8%。

A radial magnetized electromagnetic sensor for defect detection of traction steel strip is proposed to realize its precise detection. Based on the electromagnetic coupling and the magnetization characteristics of high-permeability materials, an equivalent model of the radial magnetization electromagnetic sensor is established for the finite element analysis method, and it is analyzed that the width of the polymagnetic core and the number of Ampere-Turns of the coil have an influence on the magnetic induction intensity at the measurement site. The results show that the best magnetization effect of the magnet core is 1 mm in width, and the magnetic induction intensity increases with the increase in the number of Ampere-Turns and tends to saturate at the measurement location. And, for wire breakage and wear defects, and the mapping relationship between the defect degree and the magnetic induction intensity of the measurement point is simulated and analyzed. The results show that the magnetic induction intensity of the measurement point decreases with the increase of defect degree. Finally, the performance of radial magnetized electromagnetic sensor is tested and applied to the defect detection experiment of traction steel strip. The maximum relative error between the measured value and the simulation value is 7.8%.