Design of electric servo pressure sensor based on magnetoelastic effect
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.
force sensormagnetoelastic effectsteering engineelectric cylinder
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