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Stepper motor
Stepper motor is known by its important property to convert a train of input pulses i.e. a square wave pulse into a precisely defined increment in the shaft position. Each pulse moves the shaft through a fixed angle. So the stepper motor is an electromechanical device which actuates a train of step movements of shaft in response to train of input pulses.

The step movement may be angular or linear. There is one-one relationship between an input pulse and step movement of shaft. Each pulse input actuates one step movement of shaft. When a given number of drive pulses are supplied to the motor, the shaft gets turned through a known angle.the angle through which the motor turns or shaft moves for each pulse is known as the step angle, expressed in degrees. As such angle is dependent on the number of input pulses, the motor is suitable for controlling position by controlling the number of input pulses. Such system, used to control the position are called as position control system.

Applications Of Stepper Motor:
Stepper motors are used in a wide variety of applications in industry, including computer peripherals, business machines, motion control, and robotics, which are included in process control and machine tool applications. A complete list of applications is shown below.