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Stepping motor driver is a kind of executive mechanism that converts electric pulses into angular displacement. When the stepper driver receives a pulse signal it will drive a step motor according to set the direction of rotation of a fixed point (called "step angle"), its rotation is in fixed angle step by step operation. Can by controlling the pulse number to control the amount of angular displacement, so as to achieve the purpose of accurate positioning; at the same time can by controlling the pulse frequency to control the motor rotation speed and acceleration, so as to achieve the purpose of speed regulation and positioning.