There are wide ranges of applications of servos from a simple electronics project to even the automated manufacturing system. Inside a servo, there is a servo motor, potentiometer, and a control circuit present. Inside the motor, a servo circuit (วงจร เซอร์ โว, which is the term in Thai) is present which has a positional shaft that is usually fitted with gear and also a control arm. It has been noticed that using the potentiometer that is attached to the rotating shaft and servo sense position the incoming pulse is measured. This applies the current to the motor to turn the shaft until the potentiometer indicated that the position corresponds to the incoming pulse width. The servo motors are being used in various applications and have been in business for a longer time. If you talk about the size of this motor, it very small but highly energy efficient. This is the main reason why they could be used in the remote control car, airplanes, and robots.
Most of them have a query about what is present inside a servo? So as mentioned above inside a servo motor, you can find a potentiometer, Control circuit, and a small DC motor. This motor is usually connected with the help of gears to control the wheels. The moment you make the motor rotates then the resistance of the potentiometer also changes. This helps the control circuit to regulate the movement in any particular direction.
You need to keep one thing in your mind that as soon as the shaft of the motor is kept at the desired position the power that is supplied to the motor is stopped. The speed of the motor is completely proportional to the difference between the desired position and the actual position. Thus, it can be said that if the motor is near to any desired position then there are high chances that it will turn slowly. On the other hand, if it is away from the desired location then it is likely to run fast. This entire process is known as proportional control. It means that the motor will run based on the requirement to complete the task and it will highly efficient in doing the task. You must be aware of the fact that servos are controlled just by sending an electrical pulse of variable width with the help of the control wire.