Stepper Motor

A stepper motor is a rotary actuator that
allows for precise control of angular
position. It consists of a motor coupled
to a sensor for position feedback. It also
requires a servo drive to complete the
system. The drive uses the feedback
sensor to precisely control the rotary
position of the motor. This is called
closed-loop operation. By running the
system closed-loop, servo motors
provide a high performance alternative
to stepper and AC induction motors.