Stepper motor

A stepper motor is an electromagnetic, rotary actuator, which mechanically converts digital pulse inputs to incremental shaft rotation. the motor is able to hold its position (and load) between the steps without the aid of clutches or brakes. Thus a stepper motor can be precisely controlled so that it rotates a certain number of steps, producing mechanical motion through a specific distance and then holds it load when it stops. There are several types of stepper motor constructions. The hybrid rotor is constructed using cylindrical permanent magnet oriented with the north-south polarity along the rotor axis. Two laminated end caps are used with teeth around the periphery. The north and south teeth are staggered to provide effective poles using a single permanent magnet. The stator laminates typically have four large forks. Each fork has some teeth. The teeth for the two windings are also staggered to line up with the appropriate teeth on the rotor. Applications include small appliances, HVAC etc.