Servo Motor Encoder
According to the classical definition, a servomechanism is an engine pieced together with a feedback sensor and a controller to form a closed-loop control circuit.
In the circuit, the sensor orchestrates the following operations:
Observes the mechanical motion of the actuator shaft—a change of position and the rate of change.
Converts the mechanical input into an electrical impulse and transmits a series of such impulses as a quadrature signal to a controller.
To obtain velocity or angular displacement data, an encoder in a servo motor can be replaced with a potentiometer, a resolver, or a Hall effect transducer.