Servo motor
A servo system mainly consists of three basic components - a controlled
device, a output sensor, a feedback system. This is an automatic closed loop
control system. Here instead of controlling a device by applying the variable
input signal, the device is controlled by a feedback signal generated by
comparing output signal and reference input signal.
When reference input signal or command signal is applied to the system, it is
compared with output reference signal of the system produced by output
sensor, and a third signal produced by a feedback system. This third signal
acts as an input signal of controlled device. This input signal to the device
presents as long as there is a logical difference between reference input signal
and the output signal of the system. After the device achieves its desired
output, there will be no longer the logical difference between reference input
signal and reference output signal of the system. Then, the third signal
produced by comparing theses above said signals will not remain enough to
operate the device further and to produce a further output of the system until
the next reference input signal or command signal is applied to the system.
Hence, the primary task of a servomechanism is to maintain the output of a
system at the desired value in the presence of disturbances.
Principle of operation Servo Motor
device, a output sensor, a feedback system. This is an automatic closed loop
control system. Here instead of controlling a device by applying the variable
input signal, the device is controlled by a feedback signal generated by
comparing output signal and reference input signal.
When reference input signal or command signal is applied to the system, it is
compared with output reference signal of the system produced by output
sensor, and a third signal produced by a feedback system. This third signal
acts as an input signal of controlled device. This input signal to the device
presents as long as there is a logical difference between reference input signal
and the output signal of the system. After the device achieves its desired
output, there will be no longer the logical difference between reference input
signal and reference output signal of the system. Then, the third signal
produced by comparing theses above said signals will not remain enough to
operate the device further and to produce a further output of the system until
the next reference input signal or command signal is applied to the system.
Hence, the primary task of a servomechanism is to maintain the output of a
system at the desired value in the presence of disturbances.
Principle of operation Servo Motor
A servo motor is basically a DC Motor (in some special cases it is AC motor)
along with some other special purpose components that make a DC motor a
servo. In a servo unit, you will find a small DC Motor, a potentiometer, gear
arrangement and an intelligent circuitry. The intelligent circuitry along with
the potentiometer makes the servo to rotate according to our wishes. As we
know, a small DC Motor will rotate with high speed but the torque generated
by its rotation will not be enough to move even a light load. This is where the
gear system inside a servomechanism comes into the picture. The gear
mechanism will take high input speed of the motor (fast) and at the output,
we will get an output speed which is slower than original input speed but more
practical and widely applicable
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