Tuesday, May 14, 2013

Servo Motor

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.
 
DC Servo Motor
A Servo motor with a rotation limit of 1800 is shown in the image.
 
Servo Motor Wiring 
Servo Motor Feedback Circuit
The circuit shown in the above image consists of the necessary control and feedback providing components.
Servo Motor ARM
A servo horn or also known as servo arm which rotates with the motor spindle.
Servo Motor Gear Assembly
Gears arrangement plays an important role to provide necessary high torque and to provide feedback.
Servo Motor Gears
The above image shows various gears used in a servo motor.
Motor and Potentiometer in 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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