Stepper Motors

Stepper motors operate differently from DC motors, which rotate when voltage is applied to their terminals. They have electromagnets arranged around the rotor. The electromagnets are energised to provide a precise, stepped, rotation.

Due to this design, the motor’s position is controlled, without a feedback device, and provides low-cost, dynamic motion, especially in low-speed applications. 

For higher performance, the motors can be fitted with an encoder (closed-loop control).