Like other motors a stepper motor also converts the electrical power into mechanical rotation. A stepper motor rotates in distinct steps where each step is a fraction of a full circle. Stepper motors are driven with pulses and one set of pulses can move the stepper motor by one step only.The top and bottom mounting plates made up of aluminum with stator in between. The rotor shaft and wires are coming out. A Stepper motor has a stator and a rotor. The rotor has a permanent magnet attached to it. The stator is made up of coils as shown in the image. There are eight coils in this motor. Every coil in the motor behaves as an electromagnet, when they are energized by electrical pulses.