Pump-controlled electro-hydraulic servo system
Release time:
2020-09-22 12:03
Source:
The hydraulic power actuator of the pump-controlled electro-hydraulic servo system is composed of a variable pump and a hydraulicMotorComposition. The variable pump of the electro-hydraulic servo system is not only the hydraulic energy, but also the hydraulic control element. Since the force required to operate the variable mechanism is large, a low-power hydraulic amplifier is generally used as the variable control mechanism.
pump-controlled electro-hydraulic servo system hydraulicsMotorofRateFeedbackIndicationby hydraulicMotorcontrolled by hydraulicMotorofRateFeedback control. and input command voltageIndicationur comparison, get the deviation voltageIndicationUE=uruf。当RateInstruction isU0, the load will be given.RateRotating this offset voltage corresponds to a certain position of the hydraulic cylinder and thus to a certain amount of stray flow output.
The flow rate of the spring-controlled electro-hydraulic servo system is to maintain the load.Rateflow required by Wu, if negative soft changes or other causesRateChange, ifW is greater than Wo, that is, UF is greater than uf0 UE = U0 UF is less than UCO. The output displacement of the hydraulic cylinder decreases, the output flow decreases, and the hydraulic pressureMotorThe speed is automatically reduced to the given value.
Conversely, if the speed decreases,If UF is less than uf0, the UE = ur0 UF of the pump-controlled electro-hydraulic servo system is greater than ue0, which increases the output displacement of the hydraulic cylinder, increases the output flow, and increases the hydraulic pressure.MotorThe speed automatically returns to the given value. WhenRateWhen the command is fixed, the hydraulic pressureMotorofRateremain constant; whenRateWhen the command changes, the hydraulic pressureMotorofRateAlso changed.
The working principle of the pump-controlled electro-hydraulic servo system is as follows: The composition of the electro-hydraulic servo control system: The function of the input element is to inputIndicationTo the input of the system, the input element can be mechanical, electrical, etc., such as profiling, potentiometer, computer and other feedback measurement elements.-Measure system output and convert it into feedbackIndication, such as various sensors and pressure sensors.
Will input and feedbackIndicationmake a comparison and give the deviationIndication. amplifying conversion elements: shifting deviationsIndicationAmplification to hydraulicIndication. Yin servo amplifier, electro-hydraulic servo valve and other executive components-Generate adjustment actions on control objects, such as hydraulic cylinders, hydraulicMotorWait. Control Object-controlled equipment, I .e. load.Hydraulic energy devices and various correction devices,
The above is the pump-controlled electro-hydraulic servo system, he regular according to the electric servo system has a lot of unique features.
Electro-hydraulic servo system
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