电感式位移传感器输出特性仿真分析

电感式位移传感器因其结构及电磁感应特点,不可避免地出现输出非线性与温度漂移的问题,影响其测试精度。针对这一问题,在分析电感式位移传感器结构特性与工作原理的基础上,建立了其输入/输出关系数学模型,并运用Matlab软件进行了仿真分析;探讨了输入/输出参数之间的变化规律。研究结果表明:电感式位移传感器存在一个近似线性工作区域±δmax,其线性度误差受线圈匝数与半径的影响;在其他参数一定的情况下,线圈半径与线圈匝数分别为定值、依次改变线圈匝数与线圈半径时,存在铁芯位移x,且当x≤│δmax│时,传感器输出特性近似成线性关系,线性度好;当x≥│δmax│时,传感器输出特性为非线性关系,线性度差。

Simulation analysis of output characteristic of inductive displacement transducer

Aiming at structure and electromagnetic induction characteristics of inductive displacement transducers,it is inevitable to appear the problem between nonlinearity output and temperature drift,by which its testing accuracy is affected,on the basis of analysis of structural characteristics and working principle of the inductive displacement sensor,mathematical model of the relationship between input and output was constructed,and the model was simulated and analyzed by Matlab software.The change regulation of input and output parameters was investigated.The results indicate that the inductive displacement transducer has an proximately linear extent（±δmax） and the linearity errors are influenced by the coils number and the semidiameter.In the case of relatively constant of other parameters,when the coil of radius and the number of coil turns are fixed,or the coil radius and the number of turns are changed in proper sequence.There is the core displacement x and when x ≤ │δmax │,the sensor output characteristic has an favorable linearity.When x ≥│δmax │,the output property of the sensor appears worse linearity.