基于磁弹效应的电动舵机压力传感器设计
Design of electric servo pressure sensor based on magnetoelastic effect
王宁 1张子建 1许峻1
作者信息
- 1. 南京航空航天大学 航天学院,江苏 南京 210016
- 折叠
摘要
为了实现对电动舵机的电动缸输出轴压力的动态测量,该文设计并实现了一种基于磁弹效应的非接触式压力传感器,它包括传感器探头和信号处理电路两部分.该文首先从磁致伸缩的理论模型中分析并建立了传感器的测量原理,设计了传感器探头的结构.为优化激励源,通过实验研究分析了不同的激励源对传感器信号的影响,结果表明采用 105 kHz、幅值为 5V的方波作为激励源时传感器输出信号最优,并以此设计了传感器信号电路.通过对传感器整体的压力标定实验得到传感器灵敏度为0.294 mV/N,重复性误差为3.53%,在运用三阶多项式拟合对传感器输入输出曲线进行校正后得到传感器的非线性误差为 1.76%,适用于承压较大的电动缸输出轴及其他大重量设备的动态压力测量.
Abstract
To achieve dynamic measurement of the output shaft pressure of the electric cylinder of the electric servo,this paper designs and implements a non-contact pressure sensor based on the magneto elastic effect,which includes two parts:a sensor probe and a signal processing circuit.This paper first analyzes and establishes the measurement principle of the sensor from the theoretical model of magneto-striction,and then designs the structure of the sensor probe.To optimize the excitation source,the influ-ence of different excitation sources on the sensor signal is analyzed through experimental research.The results indicate that employing a 105 kHz square wave with an amplitude of 5 V as the excitation source contributes to the optimal output signal of the sensor.Based on this phenomenon,the sensor signal circuit is designed.Through the pressure calibration experiment of the sensor as a whole,the sensitivity of the sensor can reach 0.294 mV/N,and the repeatability error is3.53%.After correcting the input and out-put curves of the sensor using third-order polynomial fitting,the nonlinear error of the sensor achieves 1.76%,which is suitable for dynamic pressure measurement of electric cylinder output shafts and other heavy equipment with high pressure.
关键词
压力传感器/磁弹效应/舵机/电动缸Key words
force sensor/magnetoelastic effect/steering engine/electric cylinder引用本文复制引用
基金项目
机器人技术与系统全国重点实验室开放基金(SKLRS-2022-KF-19)
出版年
2024
NETL
NSTL
万方数据