Stepper motor is an openloop control element that converts electrical pulse signals into angular displacement or linear displacement.
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In the case of nonoverload, the speed and stop position of the motor only depend on the frequency and pulse number of the pulse signal, and are not affected by the load change.

That is, when a pulse signal is added to the motor, the motor rotates through a step angle. The existence of this linear relationship, coupled with the characteristics of the stepper motor having only periodic errors and no cumulative errors.

This makes it very simple to use stepper motors to control the speed, position and other control fields.