【Daily Discussion】Utilities - Mechanical & Electrical - 20200722

Composition: Motor + actuator + valve body； Working principle: The rotational motion of the motor is converted into the up and down movement (opening and closing) of the valve plate.

An electric control valve generally consists of an electric actuator and a servo amplifier. The function of a servo amplifier is to use the input signal from the controller, via a magnetic circuit, to control the triacs and thyristor switches, thereby regulating the power supply for the servo motor that drives the actuator. When the input to the servo amplifier is zero, the amplifier’s output is also zero; the servo motor does not rotate, and the output shaft remains in its original position. The feedback signal from the position sensor is also zero. When the servo amplifier receives an input ISR, the position feedback signal If of the electric control valve, which has the opposite polarity, is compared in the pre-amplifier; due to this difference, a magnetic flux is generated. The current generated by this magnetic potential triggers the thyristor, which in turn drives the servo motor to cause the actuator to rotate in the direction that reduces the magnetic potential. When the position feedback signal If is equal to the input signal ISR again, the magnetic potential is zero once more. The output shaft is stabilized at the angular position corresponding to the input signal. The relationship between the output shaft angle θ and the input signal ISR is θ = KISR. An electromagnetic brake is also typically installed at the rear end of the servo motor; when the motor is powered on, the brake disc separates from the motor shaft, allowing the motor to rotate. When the motor is powered off, the brake disc locks the motor shaft, allowing the shaft under load to stop in a specific position. 

An electric control valve generally consists of an electric actuator and a servo amplifier. The function of a servo amplifier is to use the input signal from the controller, via a magnetic circuit, to control the triacs and thyristor switches, thereby regulating the power supply for the servo motor that drives the actuator.

An electric control valve generally consists of an electric actuator and a servo amplifier. The function of a servo amplifier is to use the input signal from the controller, via a magnetic circuit, to control the triacs and thyristor switches, thereby regulating the power supply for the servo motor that drives the actuator.

Electric control valves generally consist of a servo amplifier and an actuator. The function of the servo amplifier is to use the input signal from the controller, through a magnetic circuit, to control the triac switches in order to regulate the power supply to the servo motor that drives the actuator. When the input to the servo amplifier is zero, its output is also zero; the servo motor does not rotate, and the output shaft remains in its original position, with the feedback signal from the position sensor also being zero. When there is an input ISR to the servo amplifier, this signal is compared with the position feedback signal If, which has the opposite polarity, within the pre-amplifier. Due to this difference, a magnetic field is generated. The current produced by this magnetic field triggers the triac, causing the servo motor to rotate in the direction that reduces the magnetic field strength. When the position feedback signal If again equals the input signal ISR, the magnetic field becomes zero, and the output shaft stays at the angle corresponding to the input signal. The relationship between the output shaft angle θ and the input signal ISR is given by θ = KISR. An electromagnetic brake is usually installed at the end of the servo motor; when the motor is powered on, the brake disc separates from the motor shaft, allowing the motor to rotate. When the power is cut off, the brake disc locks the motor shaft, preventing it from moving and keeping the shaft in place even under load.

Electric control valves generally consist of a servo amplifier and an actuator. The function of the servo amplifier is to use the input signal from the controller, through a magnetic circuit, to control the triac switches in order to regulate the power supply for the servo motor that drives the actuator. When the input to the servo amplifier is zero, its output is also zero; the servo motor does not rotate, and the output shaft remains in its original position, with the feedback signal from the position sensor also being zero. When there is an input ISR to the servo amplifier, this signal is compared with the position feedback signal If, which has the opposite polarity, within the pre-amplifier. Due to this difference, a magnetic field is generated. The current produced by this magnetic field triggers the triac, causing the servo motor to rotate in the direction that reduces the magnetic field strength. When the position feedback signal If again equals the input signal ISR, the magnetic field becomes zero, and the output shaft stays at the angle corresponding to the input signal. The relationship between the output shaft angle θ and the input signal ISR is given by θ = KISR. An electromagnetic brake is usually installed at the end of the servo motor; when the motor is powered on, the brake disc separates from the motor shaft, allowing the motor to rotate. When the power to the motor is cut off, the brake disc locks the motor shaft, preventing the shaft carrying a load from moving from its position

Electric control valves generally consist of a servo amplifier and an actuator. The function of the servo amplifier is to use the input signal from the controller, through a magnetic circuit, to control the triac switches in order to regulate the power supply for the servo motor that drives the actuator. When the input to the servo amplifier is zero, its output is also zero; the servo motor does not rotate, and the output shaft remains in its original position, with the feedback signal from the position sensor also being zero. When there is an input ISR to the servo amplifier, this signal is compared with the position feedback signal If, which has the opposite polarity, within the pre-amplifier. Due to this difference, a magnetic field is generated. The current produced by this magnetic field triggers the triac, causing the servo motor to rotate in the direction that reduces the magnetic field strength. When the position feedback signal If again equals the input signal ISR, the magnetic field becomes zero, and the output shaft stays at the angle corresponding to the input signal. The relationship between the output shaft angle θ and the input signal ISR is given by θ = KISR. An electromagnetic brake is usually installed at the end of the servo motor; when the motor is powered on, the brake disc separates from the motor shaft, allowing the motor to rotate. When the power to the motor is cut off, the brake disc locks the motor shaft, preventing the shaft carrying a load from moving from its position

Electric control valves generally consist of a servo amplifier and an actuator. The function of a servo amplifier is to use the input signal from the controller, via a magnetic circuit, to control the triacs and thyristor switches, thereby regulating the power supply for the servo motor that drives the actuator. When the input to the servo amplifier is zero, the servo motor does not rotate. When an ISR is present at the servo amplifier’s input, it is compared with the position feedback signal If, which has the opposite polarity, in the pre-amplifier. The current generated by this magnetic field triggers the thyristor, causing the servo motor to rotate in such a direction as to reduce the magnitude of the magnetic field. When the position feedback signal If is equal to the input signal ISR as well.

An electric control valve generally consists of an electric actuator and a servo amplifier. The function of a servo amplifier is to use the input signal from the controller, via a magnetic circuit, to control the triacs and thyristor switches, thereby regulating the power supply for the servo motor that drives the actuator.

An electric control valve generally consists of an electric actuator and a servo amplifier. The function of a servo amplifier is to use the input signal from the controller, via a magnetic circuit, to control the triacs and thyristor switches, thereby regulating the power supply for the servo motor that drives the actuator.