Interfacing a stepper Motor Definition: These stepper motors are made of permanent magnet rotor with stator field excitation. Unlike the DC motors which move continuously, the stepper motors move in incremental steps. The stepper motor is a type of DC motor with the field placed on the rotor in the form of permanent magnets with two, three or four sets of coils called phases, placed in the stator around the rotor.  Common step size of stepper motor is 0.9 to 30 degree. Applications Area: Robotics, printers, object handling, plotters, disk drives etc. Types of Stepper Motors: Stepper motor can be a two phase stepper or a four phase stepper motor. A two phase stepper motor has two stator poles whereas a four phase stepper motor has four