The 2-axis closed-loop stepper motor driver is the work horse of low power positioning applications. It has a built-in joystick control for XY axes.
Stepper motors can be turned into very cost effective closed loop actuators by the addition of a simple, relatively low cost encoder. Moreover, this 2-axis closed-loop stepper motor can even be transformed into powerful brushless servo motors.
This provide a high torque in a small package. It is used to be more efficiently and hence more power is available at the output shaft.