Development of a two-stage high speed electrohydraulic servovalve systems using stack-type piezoelectric elements

This paper presents two systems of two-stage electrohydraulic servo valve with a nozzle-flapper pilot stage, which is controlled by stack-type piezoelectric elements. Two flapper moving mechanisms proposed in this research can compensate for the hysteresis problem and thermal expansion of the piezoe...

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Main Authors: Young-Bong Bang, Choon-Shik Joo, Kyo-II Lee, Jae-Woong Hur, Won-Kyu Lim
Format: Conference Proceeding
Language:English
Subjects:
Electrohydraulics
Fluid flow control
Force feedback
Frequency response
Hysteresis motors
Motion control
Servomotors
Springs
Thermal expansion
Torque
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creator Young-Bong Bang
Choon-Shik Joo
Kyo-II Lee
Jae-Woong Hur
Won-Kyu Lim
description This paper presents two systems of two-stage electrohydraulic servo valve with a nozzle-flapper pilot stage, which is controlled by stack-type piezoelectric elements. Two flapper moving mechanisms proposed in this research can compensate for the hysteresis problem and thermal expansion of the piezoelectric elements. The experimental results show that the first flapper moving mechanism has the frequency response of over 500 Hz and the second one has the response of over 600 Hz. And the first simplified servovalve system using the first flapper moving mechanism has the frequency response of about 150 Hz, and the second system has the response of about 300 Hz at the supply pressure of 210 bar.
doi_str_mv 10.1109/AIM.2003.1225084
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subjects Electrohydraulics
Fluid flow control
Force feedback
Frequency response
Hysteresis motors
Motion control
Servomotors
Springs
Thermal expansion
Torque
title Development of a two-stage high speed electrohydraulic servovalve systems using stack-type piezoelectric elements
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