In modern control, various systems are becoming increasingly complex and refined, and it is not just a certain driving control technology that can meet the various control functions of the system. Electric actuators are mainly used in applications that require precision control. With the continuous improvement of flexibility requirements in automation equipment, the same equipment often needs to adapt to the processing needs of different sizes of workpieces. The actuators require multi-point positioning control, and the operating speed and torque of the actuators need to be controlled or synchronously tracked, which cannot be achieved using traditional pneumatic control, And electric actuators can easily achieve such control. From this, it can be seen that pneumatic actuators are more suitable for simple motion control, while electric actuators are mostly used in precision motion control situations.

In terms of technical performance, the advantages of pneumatic actuators mainly include the following four aspects:

(1) The load is large and can adapt to applications with high torque output (however, current electric actuators have gradually reached the current level of pneumatic load).

(2) Act quickly and react quickly.

(3) Good adaptability to working environment, especially in harsh working environments such as flammable, explosive, dusty, strong magnetic, radiation, and vibration, superior to hydraulic, electronic, and electrical control.

(4) When the stroke is blocked or the valve stem is tied, the motor is easily damaged.

The advantages of electric actuators mainly include:

(1) Compact structure and compact size. Compared to pneumatic actuators, electric actuators have a relatively simple structure. A basic electronic system includes actuators, three position DPDT switches, fuses, and some wires, making it easy to assemble.

(2) The driving source of the electric actuator is very flexible, and the general on-board power supply can meet the needs, while the pneumatic actuator requires an air source and a compression driving device.

(3) Electric actuators have no risk of "air leakage" and have high reliability, while the compressibility of air makes the stability of pneumatic actuators slightly poor.

(4) There is no need to install and maintain various pneumatic pipelines.

(5) It is possible to maintain load without power, while pneumatic actuators require continuous pressure supply.

(6) Due to the absence of additional pressure devices, electric actuators are quieter. Usually, if the pneumatic actuator is under heavy load, a silencer needs to be installed.

(7) In pneumatic devices, it is usually necessary to convert electrical signals into pneumatic signals, which are then converted into electrical signals. The transmission speed is slow and should not be used in complex circuits with too many component stages

(8) Electric actuators are superior in terms of control accuracy.

In fact, pneumatic and electric systems are not mutually exclusive. Pneumatic actuators can easily achieve fast linear cyclic motion, with a simple structure and convenient maintenance. They can also be used in various harsh working environments, such as explosion-proof requirements, dusty or humid conditions. However, in situations where the force increases rapidly and positioning is required, electric drives with servo motors have advantages. For applications that require *, synchronous operation, adjustability, and specified positioning programming, electric drives are a good choice. An electric drive system composed of servo or stepper motors with closed-loop positioning controllers can supplement the shortcomings of pneumatic systems.