1. Principles of electric actuators - Introduction An actuator, also known as an actuator, is a commonly used electromechanical integration device in the field of automatic control. Its broad definition is: a driving device that can provide linear or rotational motion, utilizing a certain driving energy source and working under a certain control signal. The actuator uses liquid, gas, electricity, or other energy sources and converts them into driving force through motors, cylinders, or other devices.
2. Principles of electric actuators - Classification Electric actuators can be divided into several categories based on power type, including pneumatic, hydraulic, electric, and electro-hydraulic; According to the form of motion, it can be divided into several categories: straight stroke, angular stroke, rotary type, etc; According to different standards, electric models can be divided into: combination structure, mechatronics integration structure, electrical control type, electronic control type, intelligent control type, digital type, analog type, infrared remote control debugging type, etc. Due to the unparalleled advantages of using electricity as a power source compared to other types of media, electric models have developed rapidly in recent years and have a wide range of applications.
3. Principle of electric actuator Let's take the MD series electric actuator as an example to introduce its principle. MD series electric actuators are Servomechanism driven by AC servo motors. The position positioner PM-2 control board receives 4~20mA DC control signals of the regulating system and the position feedback borrow number of the position transmitter for comparison. After the comparison, the signal deviation is connected through the amplifier power stage, and then the output of the mutual motor rotates to drive the actuator to move in the direction of reducing the deviation, Until the deviation signal is less than the set value. At this point, the output of the actuator can be stabilized in the position corresponding to the input signal.
4. Principles of electric actuators - Application The actuator is mainly used to drive the valve to the fully open or fully closed state. The actuator used to control the valve can accurately position the valve in any position. Although most actuators are used to open and close valves, the current design of actuators goes far beyond simple switching functions. They include position sensing devices, torque sensing devices, electrode protection devices, logic control devices, digital communication modules, and PID control modules, all of which are installed in a compact housing.
