电位器式传感器结构和原理

Release time:2023-06-05
author:Ameya360
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  电位器式传感器结构

  电位器一种常见的机电元件,广泛应用于各种电气设备和电子设备中。电位器传感器就是将机械位移通过电位器转换为与之成一定函数关系的电阻或电压输出的传感器。

电位器式传感器结构和原理

  由电位器由电阻元件、电刷、骨架等组成。

  形式:直滑式和旋转式,旋转式有单圈旋转式和多圈旋转式两种,电刷有触头、臂、导向及牰承等装置组成。触头常用银、铂铱、铂铑等金属。电刷臂用磷青铜等弹性较好的材料。骨架常用陶瓷、酚醛树脂及工程数料等绝缘材料。

  电位器式传感器原理

  在日常工作中,电位器可以说是一种常用的机电元件,广泛应用于各类电器和电子设备中。电位器式电阻传感器可将机械的直线位移或角位移输入量转换为与其成一定函数关系的电阻或电压输出。它除了用于线位移和角位移测量外,还广泛应用于测量压力、加速度、液位等物理量。

  电位器式传感器结构简单,体积小,质量轻,价格低廉,性能稳定,对环境条件要求不高,输出信号较大,一般不需放大,并易实现函数关系的转换。但电阻元件与电刷间由于存在摩擦及分辨率有限,故其精度一般不高,动态响应较差,主要适合于测量变化较缓慢的量。电位器式传感器种类较多,根据输入—输出特性的不同,电位器式电阻传感器可分为线性电位器和非线性电位器两种;根据结构形式的不同,又可分为绕线式、薄膜式、光电式等。

  电位器式电阻传感器一般由电阻元件、骨架及电刷等组成。电刷相对于电阻元件的运动可以是直线运动、转动或螺旋运动。当被测量发生变化时,通过电刷触点在电阻元件上产生移动,该触点与电阻元件间的电阻值就会发生变化,即可实现位移与电阻之间的线性转换,这就是电位器传感器的工作原理。电阻式传感器是一种应用较早的电参数传感器,它的种类繁多,应用十分广泛,其基本原理是将被测物理量的变化转换成与之有对应关系的电阻值的变化,再经过相应的测量电路后,反映出被测量的变化。电位式传感器结构简单、线性和稳定性较好,与相应的测量电路可组成测力、测压、称重、测位移、测加速度、测扭矩、测温度等检测系统,已成为生产过程检测及实现生产自动化不可缺少的手段之一。

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