Servo Motor
Servo Motors are DC Motors (check out how DC motor works)
with a servo mechanism to provide a precise angular motion. Pulse width
modulation (PWM) technique is used to set the angle of rotation.
Generally RC servo motors have a rotation limit of 900 to 1800 but servos with high rotation angles are also available.
A Servo motor with a rotation limit of 1800 is shown in the image.
The circuit shown in the above image consists of the necessary control and feedback providing components.
A servo horn or also known as servo arm which rotates with the motor spindle.
Gears arrangement plays an important role to provide necessary high torque and to provide feedback.
The above image shows various gears used in a servo motor.
The
above image shows the DC motor and the potentiometer which is used to
provide feedback to the electronic circuitry. It is connected with the
DC motor with the help of gear assembly. As soon as the motor starts
rotating the potentiometer also starts rotating and the output of
potentiometer i.e. voltage across the middle terminal changes which acts
as the feedback signal to indicate the degree of rotation of the motor.
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