Overview of Electric Actuators and Smart Actuators

Abstract: The overview information of electric actuators and intelligent actuators is provided by excellent flowmeter and flowmeter manufacturers. 1.1. Electric actuators Electric actuators, like pneumatic actuators, are an important part of the control system. It receives the DC current signal of 0~10mA or 4~20mA from the controller and converts it into the corresponding angular displacement or linear displacement. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is an overview of electric actuators and intelligent actuators for details. 1.1. Electric actuators Electric actuators, like pneumatic actuators, are an important part of the control system. It receives the DC current signal of 0~10mA or 4~20mA from the controller, and converts it into the corresponding angular displacement or linear displacement to operate the valve, baffle and other control mechanisms to achieve automatic control. Electric actuators are available in angular stroke, linear stroke and multi-turn types. The angular stroke electric actuator uses the motor as the power element to convert the input DC current signal into the corresponding angular displacement (0°~90°), this actuator is suitable for operating rotary control valves such as butterfly valves and flappers. After receiving the input DC current signal, the linear actuator rotates the motor, and then decelerates and converts it into a linear displacement output through the reducer to operate various control valves such as single-seat, double-seat, three-way and other linear control mechanisms. Multi-turn electric actuators are mainly used to open and close multi-turn valves such as gate valves and globe valves. Because its electric power is relatively large, the largest is tens of kilowatts, and it is generally used for local operation and remote control. Several types of electric actuators are basically the same in electrical principle, but the reducer is different. The following is a brief introduction to the electric actuator of the angular stroke. The electric actuator consists of a servo amplifier and an actuator. The actuator also includes a two-phase servo reducer and a position transmitter. It is a block diagram of the electric actuator. The Ii from the regulator is used as the input signal of the servo amplifier. It is compared with the position feedback signal If, and the difference is amplified to control the forward or reverse rotation of the two-phase servo motor. valve opening or angular displacement of the flapper). At the same time, the displacement of the output shaft is converted into a current signal by the position transmitter, which is used as the valve position indication and feedback signal If. When If is equal to Ii, the two-phase motor stops rotating, and the opening of the regulating valve is stabilized at a position proportional to the output of the regulator (ie, the input of the actuator) signal Ii. output shaft angleθThe relationship with the input signal Ii is in the formula, and the scale is the scale factor. It can be seen from the above formula that the rotation angle of the output shaft is proportional to the input signal, and the electric actuator can be regarded as a proportional link. The electric actuator can also realize the mutual switching between the automatic operation and the manual operation of the control system through the electric operator. When the toggle switch of the operator is tangential“manual”When it is in position, the power supply of the motor is directly controlled by the forward and reverse operation buttons, so as to realize the forward and reverse rotation of the output shaft of the actuator, and perform remote manual operation. The servo amplifiers and actuators of electric actuators are introduced separately below. 1. Servo amplifier The servo amplifier is composed of a pre-magnetic amplifier, a trigger, a thyristor main circuit and a power supply. As shown in Figure 4-5. Its function is to synthesize the input signal and the feedback signal, and amplify the result signal to make it have enough power to control the rotation of the servo motor. According to the polarity of the resultant signal after synthesis, the amplifier should output the signal of the corresponding polarity to control the forward and reverse operation of the motor. In order to meet the requirements of composing a complex control system, the servo amplifier has 3 input signal channels and a position feedback channel-_therefore, it can input 3 signals and a position feedback signal at the same time. Simple control system using only one input channel and position feedback channel. The pre-stage magnetic amplifier is an amplifier with high gain. The input signal from the controller and the position feedback signal are compared in the magnetic amplifier. When the two are not equal, the amplifier amplifies the deviation signal, and according to the input signal and the feedback phase The positive and negative polarities of the subtracted deviation and the amplifier generate a two-bit input voltage at points a and b to control one of the two transistor trigger circuits to work and the other to be turned off, so that the thyristor of the main circuit is turned on, and the two-phase servo motor is connected. It rotates when it is powered on, thereby driving the adjusting mechanism to actively control. The thyristor acts as a non-contact switch in the circuit. The servo amplifier has two sets of switching circuits, namely the trigger and the main circuit, each of which accepts positive or negative deviation input signals to control the forward or reverse rotation of the servo motor. At the same time, the position feedback signal changes with the change of the motor rotation angle. When the position feedback signal is equal to the input signal, the pre-feedback signal changes with the motor rotation angle. When the position feedback signal is equal to the input signal, the pre-amplifier There is no output and the servo motor stops. 2. Actuator The actuator is composed of three parts: servo motor, reducer and position transmitter. It receives the output signal of the servo amplifier or electric operator, controls the forward and reverse rotation of the servo motor, and then becomes the output torque after being decelerated by the reducer to push the adjustment mechanism.

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