Transcription of Electro-Hydraulic Servo Valve Construction, Models and Use
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Electro-Hydraulic Servo Valve Construction, Models and Use
Electro-Hydraulic Servo Valve Construction, Models and Use From Merritt, H. E., Hydraulic Control Systems, J. Wiley, 1967. The input to an Electro-Hydraulic (EH) servovalve is typically a current or a differential current that powers an electromagnetic torque motor. The differential current i is typically supplied by an amplifier to avoid excess loading of the interface to the computer or controller. In the simplest (but not typical) form, the torque motor moves a spool Valve as shown below. The spool Valve allows the hydraulic fluid to pass from the supply to the return across two variable metering orifices with a controlled flow rate QL. If the spool is shifted in the other direction the direction of flow will reverse.
MOOG INC. CONTROLS DIVISION, EAST AURORA, NY 14052 TRANSFER INTRODUCTION FUNCTIONS FOR MOOG SERVOVALVES It is often convenient in servoanalysis
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