Because of the stepper motor is a kind of electrical pulses into angular displacement of the actuator. Popular point: when the stepper motor driver receives a pulse signal, it is driving a stepper motor according to set the direction of a fixed point (And the step Angle)。 You 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 you can control the pulse frequency to control motor rotation speed and acceleration, so as to achieve the purpose of regulating. keep refers to the stepper motor torque is electricity but no turns, locked rotor torque of the stator. It is one of the most important parameters of step motor, stepping motor at low speed torque close holding torque. As a result of the stepper motor output torque along with the increase of speed and continuous attenuation, the output power also along with the increase of speed change, so keep the torque is becoming one of the most important parameters of stepper motor. For example, when people say 2 n. M the stepper motor. In the absence of special instructions refers to holding torque is 2 n. M the stepper motor. the main products: stepper motor, brushless motor, servo motor, stepping motor drive, brake motor, linear motor and other kinds of models of the stepper motor, welcome to inquire. Telephone: