What is the working principle of the hydraulic servo system? What are its advantages and disadvantages?

What is the working principle of the hydraulic servo system? What are its advantages and disadvantages?

In order to improve the control accuracy of the hydraulic system, the traditional electro-hydraulic servo control method has been replaced with a numerical control hydraulic servo control method. By fully leveraging advanced computer technology and using PLC to control the stepper motor, not only can the rapidity and reliability requirements of the numerical control hydraulic system be met, but also the cost is significantly reduced.

Firstly, the composition of the numerical control hydraulic servo system was introduced. Secondly, the structure and working principle of the numerical control hydraulic servo valve were described. The hydraulic pump station was also introduced. Let's take a closer look together.

1. The composition of the numerical control hydraulic servo system consists of four major parts: the numerical control device, the numerical control servo valve, the numerical control hydraulic cylinder or hydraulic motor, and the hydraulic pump station.

(1) Numerical control device: It includes the controller, the driver and the stepper motor. The reason for using the stepper motor is that with the rapid development of computer technology, the performance of the stepper motor can meet the requirements of the numerical control hydraulic system in terms of speed and reliability. Moreover, its low price makes it an attractive option. Also, due to the improvement of the structure of the numerical control hydraulic system, the power required for the stepper motor is relatively small. Therefore, without the need to adopt large-power servo motor systems such as wide-speed servo motors, the cost can be significantly reduced.

(2) The hydraulic cylinders, hydraulic motors and hydraulic pump stations are traditional products in the hydraulic industry. As long as they are selected with high precision according to the requirements of the numerical control hydraulic servo system, they can be put into use.

(3) The servo control element is an important and fundamental component in the hydraulic servo system. It performs functions such as signal conversion, power amplification, and feedback for control. Therefore, the key component of the entire numerical control hydraulic servo system is the numerical control servo valve, which must convert electrical pulses for control...

Hydraulic system

The composition of the hydraulic servo system - Advantages and disadvantages of the hydraulic servo system

The hydraulic servo system enables the output quantity of the system, such as displacement, speed or force, to automatically, rapidly and accurately change in response to the variations of the input quantity. At the same time, the output power is significantly amplified. The working principle of the hydraulic servo system can be illustrated by Figure 1. The hydraulic servo system has been widely applied in industrial control due to its unique advantages such as fast response, large load stiffness and large control power.

Hydraulic servo control is a complex type of hydraulic control method. The hydraulic servo system is a closed-loop hydraulic control system. Firstly, the working principle and composition of the hydraulic servo system are introduced. Secondly, the classification and working characteristics of the pressure servo system are described. The advantages and disadvantages of the hydraulic servo system are also presented. Let's follow the article to learn more.

The working principle of the hydraulic servo system: The hydraulic servo system, with its unique advantages such as fast response speed, large load stiffness, and high control power, has been widely applied in industrial control. The electro-hydraulic servo system uses electro-hydraulic servo valves to convert small power electrical signals into large power hydraulic power, thereby achieving servo control for some heavy machinery. The hydraulic servo system enables the output quantity of the system, such as displacement, speed, or force, to automatically, quickly, and accurately follow the changes in the input quantity. At the same time, the output power is significantly amplified. The working principle of the hydraulic servo system can be illustrated by Figure 1. Figure 1 shows an electro-hydraulic servo system for continuously controlling the flow of a pipeline. In the large-diameter fluid pipeline 1, the change in the rotation angle of the valve plate 2 will produce a throttling effect and play a role in regulating the flow qT. The valve plate rotates...

The working characteristics and principles of the hydraulic servo system

The servo system composed of hydraulic components (what is a servo system) is called a hydraulic servo system. And the hydraulic servo system has the advantages of being easy to achieve linear motion control of speed, displacement and force, having large driving force, torque and power, small size, light weight, good acceleration performance, fast response speed, high control accuracy, and easy stability guarantee (classification of servo systems). So, what is a hydraulic servo system? The editor collected and sorted out relevant materials to make a detailed summary of the basic knowledge of the hydraulic servo system. The working characteristics of the hydraulic servo system (working principle of the servo system)

(1) The hydraulic servo system is a position tracking system.

(2) The hydraulic servo system is a force amplification system.

(3) The hydraulic servo system is a negative feedback system.

(4) The hydraulic servo system is an error-prone system.

Classification of pressure servo systems: According to the output physical quantity: position, speed, force servo systems. According to the signal: hydraulic-mechanical, electrical-hydraulic, and pneumatic-hydraulic servo systems. According to the components: valve-controlled system, pump-controlled system. The principle of hydraulic servo systems: In hydraulic servo systems, the form of control signals includes hydraulic-mechanical servo systems, electrical-hydraulic servo systems, and pneumatic-hydraulic servo systems.

In the hydraulic servo system, the input, feedback and comparison sections of the system use mechanical components, and are commonly used in aircraft rudder control systems, automotive steering devices, hydraulic profiling machines and construction machinery. However, the friction, clearance and inertia in the feedback mechanism can have adverse effects on the system's accuracy. In the electro-hydraulic servo system, the detection, correction and initial amplification of the error signal use electrical and electronic components or computers, forming analog servo systems, digital servo systems or digital...