How a Servo Hydraulic System Works?

How a Servo Hydraulic System Works?

Hydraulic servo control: When trying to control the movement of a machine that requires a large amount of force at high speed, the electric servo system and pneumatic servo system often cannot meet the responsiveness required by the customer. In such cases, hydraulic and electro-hydraulic servos are often used. These are responsive and have a large controllable force/power capacity. The main reason for the good responsiveness of hydraulic servo hydraulic system is that the torque/inertia ratio is very large for hydraulic motors.

What is a servo valve?

Servo

valves

and

servo

proportional

valves

are

continuously

operated

electro-hydraulic valves that convert changing analog or digital input signals into stepless hydraulic control. The servo valve has an internal structure of the bushing spool, which enables extremely precise weighing. On the other hand, the servo proportional valve has a spool structure without the bushing. Due to this difference in structure, the life of the servo valve is 3 to 5 times longer than that of the servo proportional valve.

About the types of hydraulic servo control methods General Servo Hydraulic System are classified into two types according to the speed control method of the hydraulic actuator.

The first is a valve control method in which a control valve (a kind of variable throttle) is provided in the middle of the piping between the constant pressure source and the hydraulic actuator, and the valve throttle is operated to flow through the valve (to the hydraulic actuator). This method controls the speed of the hydraulic actuator by adjusting the inflow rate).

The second is the pump control method, which controls the inflow flow rate to the hydraulic actuator by changing the discharge flow rate of the variable displacement pump that is rotating at a constant rotation speed.

From the viewpoint of responsiveness, the control valve method is superior.

Advantages of hydraulic servo control The advantages of a servo-hydraulic testing machine are as follows.

• Very high power density, excellent transmission efficiency, and responsiveness • The hydraulic valve can be driven with a small amount of electric power, and high output and high precision control are possible by connecting to a computer.

For the above reasons, hydraulic servo control is used in aircraft, ships, large construction machinery, etc. In recent years, hydraulic control has also been adopted in the aerospace field and is drawing attention.

Also Read:- A Guide to Hydraulic Machine

Furthermore, by increasing the pressure of the hydraulic system, it is possible to reduce the size of the system, and development is underway. However, as the pressure increases, the hydraulic oil rises, and oil leaks occur at the same time, so it is necessary to develop new materials for the drive element and improve processing technology.

Leave it to the Servo Valve Selection and Design Technology Lab for servo valves.

Servo Valve Selection and Design Technology Lab is a company that develops the design, manufacture, and construction of precision control equipment/systems on a global scale. High-performance systems are used to control aircraft, artificial satellites, spacecraft, launch vehicles, general industrial machinery, wind power generators, testing machines, medical equipment, and more. They offer various products such as servo actuators, servo valves, controllers, and radial piston pumps.