电感式磨粒监测传感器的磁场均匀性研究

在介绍电感式磨粒监测传感器结构原理的基础上 ,提出可采用检测线圈内部磁场均匀性的方法来弥补颗粒运动轨迹和流型变化带来的检测误差 ,以提高检测灵敏度 .通过分析不同几何尺寸的线圈中轴线上磁场的变化情况 ,并借助直螺线管的径向和轴向公式 ,对轴外磁场均匀性进行了探讨 .数学模型和优化结果表明 :在检测传感器线圈中部范围内为非匀强磁场 ,且呈非线性变化 ,细长管磁场相对均匀 ;当选取 R/ L <0 .2 ,磁场在线圈轴向长度范围内 ,径向在90 %范围内可近似看作均匀磁场 .所得结果可以确定传感器检测区域的磁场均匀性范围 ,为设计电感式磨粒监测传感器提供依据 .

Study on the Magnetic Field Homogeneity of Wear Debris Detector

The principle of wear debris detector and the importance of magnetic field homogeneity are introduced. It is imperative to reach the inner magnetic homogeneity of the detecting coils so as to improve the sensitivity and reduce the measurement error originated from the changes of wear debris motion mode and flow model. Based on the radial and axial solenoid formula, the axial and external magnetic field homogeneities of the detecting coils are analyzed in detail. The mathematical model and optimized result indicate that the magnetic field in the inner wall of the detecting coils is of non homogeneity. At a ratio R/L <0.2, the magnetic field along the axial length and within the range of 90% radial direction is nearly homogeneous.It is thus supposed that the identification of the range of magnetic field homogeneity provides guidance to the design of induction transducer.