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Multi-Turn Electric Actuator Control Agency
- Jun 27, 2017 -

Electric actuators, like pneumatic actuators, are an important part of the control system. It receives 4 to 20mA or 0mA DC current signals from the controller and converts it into the corresponding angular displacement or straight stroke displacement to operate the control mechanism such as valves and baffles for automatic control.

Electric actuators have straight travel, angular travel and multi-turn type. The corner actuators convert the input DC current signal into a corresponding angular displacement (0 ° to 90 °) with a motor as a power element. This actuator is suitable for operating a rotary control valve such as a butterfly valve or a baffle. Straight trip actuator to receive the input DC current signal after the motor rotation, and then decelerated by the reducer and converted to linear displacement output, to operate single-seat, two-seat, Multi-Turn Electric Actuator three links and other control valves and other linear control mechanism. Multi-turn electric actuator is mainly used to open and close the gate valve, globe valve and other multi-turn valve, because of its motor power is relatively large, the largest dozens of kilowatts, generally used for local control and remote control. These three types of actuators are two-phase AC motor-powered position servo, the three electrical principle is exactly the same, but the reducer is not the same.

Angular output electric actuator main performance indicators: three-terminal isolation input channel, the input signal 4 a 20mA (DC), the input resistance of 250 ohms; output torque: 40,100,250,600,1000 N · m; basic error and variation less than ± 1.5%; sensitivity 240μA.

The electric actuator is mainly composed of a servo amplifier and an actuator, and the control signal from the controller can be connected by the servo amplifier in series, and the feedback signal of the output of the actuator is compared with the feedback signal of the output of the electric actuator. Multi-Turn Electric Actuator If there is a deviation, After power amplification, drive two-phase servo motor rotation. And then deceleration by the reducer, driving the output shaft to change the corner. If the difference is positive, then the servo motor is running, Multi-Turn Electric Actuator the output shaft angle increases; if the difference is negative, the servo motor reversal, the output shaft angle decreases. When the difference is zero, the servo amplifier outputs the contact signal to stop the motor, and the output shaft is stabilized at the corner position corresponding to the input signal. Multi-Turn Electric Actuator This positional feedback structure allows a good linear relationship between the input current and the output displacement.

Electric actuator can not only cooperate with the controller to achieve automatic control, but also through the operator to achieve automatic control of the control system and manual control of mutual switching. When the switch of the operator is placed in the manual operation position, Multi-Turn Electric Actuator the power supply of the motor is directly controlled by the positive and negative operation buttons to realize the forward or reverse rotation of the output shaft of the actuator, and the remote operation is carried out manually.

The position transmitter functions to linearly convert the displacement of the output shaft of the actuator into a feedback signal and feed it back to the input of the servo amplifier. The position transmitter typically includes a displacement detecting element and a switching circuit. Multi-Turn Electric Actuator The displacement detecting element is used for converting the displacement of the output shaft of the electric actuator into a signal such as millivolt or resistance, and the commonly used displacement detecting element has a differential transformer, Multi-Turn Electric Actuator a plastic film potentiometer and a displacement sensor, and a conversion circuit for outputting the displacement detecting element The signal is converted to a signal required by the amplifier, Multi-Turn Electric Actuator such as 0 to 10mA or 4 to 20mA DC current signal.