In the design of dynamic refractive trainers (or smart zoom/vision training glasses), the weight of the glasses is a crucial factor.

Among the many solutions for endoscopic handle focusing and zooming, this is the one with the lowest development difficulty and the easiest to implement.

From the two dimensions of control strategy and hardware optimization, this paper explores how to systematically achieve low-power operation of stepper motors.

The insulin pump adopts the high reliability and low cost of a stepper gear motor.