Features of Stepper Motor:  　
Precise Position Control
The specified number of pulses determines the output degree(s) generated.
Linear Speed Selection
The running speed is linearly variable and determined by the frequency of the pulses.
Low Speed Feature
Low frequency pulses being input, a stepper motor can operate at very low rotating speeds. This can be done without a speed reduction gearbox and thereby save power and maintain precision.
Forward & Reverse, Pause and Holding Function
The forward & reverse rotation is controlled by the polarity. There is still holding torque even while the motor rotor is being locked. There is still current flowing through the motor winding, but no pulse signal creating rotation from the outside controller.
Long Life
The brushless design provides stepper motors with a very long life.