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Part-Turn Electric Actuator Control And Remote Control
- Nov 01, 2017 -

The electric actuator is an important part of the control system as well as the pneumatic actuator. Part-Turn Electric Actuator It receives 4 20mA or 0 10mA DC current signals from the controller and converts them into corresponding angular or straight stroke displacements to manipulate control mechanisms such as valves and baffles to achieve automatic control.

The electric actuator has a straight stroke, Part-Turn Electric Actuator a angular stroke and a multiple-transfer type. The angular stroke electric actuator takes the electric motor as the power element, converts the input DC current signal into the corresponding angular displacement (0 degree 190 degrees), this kind of actuator is suitable for the control valve which controls the butterfly valve, Part-Turn Electric Actuator the baffle and so on. The direct travel actuator receives the input DC current signal and makes the motor rotate, then decelerates the reducer and converts it into a straight line displacement output to manipulate a variety of control valves and other linear control mechanisms such as single seat, double seater and tee. Multi-rotating electric actuator is mainly used to open and close the gate valve, globe valves, such as multiple-turn valve, because of its motor power is relatively large, Part-Turn Electric Actuator the largest Tens watts, generally used in situ control and remote control. These three types of actuators are two-phase AC motor for the power of the position servo mechanism, the three electrical principles are identical, but the reducer is not the same.

Electric actuator is mainly composed of servo amplifier and actuator, in the middle of the series operator, the servo amplifier receives the control signal from the controller, compares it with the feedback signal of the output displacement of the electric actuator, if there is a deviation, Part-Turn Electric Actuator the difference value after the power amplification, drives the two-phase servo motor to rotate. And then reducer deceleration, drive the output shaft to change the corner. If the difference is positive, the servo motor is turning, the output shaft angle increases, and if the difference is negative, Part-Turn Electric Actuator the servo motor reverses and the output shaft angle decreases. When the value is zero, the servo amplifier outputs the contact signal so that the motor stops and the output shaft is stabilized at the corner position corresponding to the input signal. This kind of position feedback structure can make the linear relationship between input current and output displacement better.

The electric actuator can not only realize the automatic control with the controller, Part-Turn Electric Actuator but also realize the automatic control and manual control of the controlling system through the operator. When the switch switch of the operator is placed in the manual operation position, Part-Turn Electric Actuator the power of the motor is directly controlled by the positive and negative operation button to realize the positive turn or reversal of the output shaft of the actuator, and the remote control manual operation is carried out.

Servo amplifiers mainly include amplifiers and two sets of thyristor AC switches. The function of the amplifier is to compare the input signal and the feedback signal, get the difference signal, and control the conduction or cutoff of the thyristor AC switch according to the polarity and size of the difference. Part-Turn Electric Actuator The thyristor switch is used to connect the AC power of the servo motor, respectively, to control the positive or negative turn or stop of the servo motor.