Electric Actuator
Product composition
Special motor
The motor for regulating valve is the driving component of the electric actuator, and its characteristic requirements are different from those of general motors. Because the actuator works frequently and is often in the starting working state, the motor is required to have the characteristics of high starting torque, small moment of inertia and low starting current, so that the motor temperature rise will not be too high when the motor is started frequently, and there is enough torque to make the electric actuator move from static to action.
Gearbox and manual switching mechanism
The gearbox converts the output power of the high-speed, low-torque motor into the power of the output shaft of the low-speed, high-torque actuator. The manual switch is semi-automatic, that is, when it is manual, move it in the direction of the arrow on the switch handle, and it will automatically reset when it is electric.
Stroke control mechanism, torque control mechanism, opening mechanism
The function of the travel control mechanism is to limit the electrical limit position. The torque control mechanism is a protection mechanism designed to protect the actuator and valve. The opening mechanism is used to indicate the opening and closing direction and position of the valve.
Working principle
The modulating electric actuator is the main executive part of the automatic control system. It is powered by a three-phase or single-phase AC power supply, receives standard signals (including analog and digital), and converts this signal into a corresponding mechanical displacement or angle to operate the regulating mechanism to complete the automatic adjustment task. The diagram of the modulating electric actuator system is shown in Figure 1. When the modulating electric actuator is in the automatic state, the MCU digital control module on the actuator receives the standard analog signal (4~20mA, DC) from the automatic control system, and compares it with the standard analog signal (4~20mA, DC) from the valve position transmitter on the electric actuator. If the difference between the two is greater than the dead zone set according to user requirements, the MCU digital control module sends a control signal to drive the modulating electric actuator to run in the direction of reducing the deviation between the two, until the deviation between the two is less than or equal to the dead zone set by the electric actuator, the MCU digital control module sends a control signal to stop the electric actuator. When the modulating electric actuator is in the electric manual operation state, the electric actuator can be operated by the internal jog button of the actuator.
Applications
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