The stepper motor is an open-loop control that receives the electrical pulse signal and rotates the corresponding step angle according to the number of signals.
In layman's terms, you push it and I move it. The moving angle is the step angle, which is an inherent property of a stepper motor. If the step angle is 15°, it means that the motor rotates 15° each time it receives a pulse.
The so-called open loop is to control, regardless of feedback.
The stepper motor rotates after it receives the pulse, but it does not guarantee that it will go. For example, if the pulse frequency is too high or the load is too large, it will result in out-of-step, that is, it will not go to position.
So when using a stepper motor, either position feedback or position feedback on other devices is required. Such as model car wheels, optical heads, camera heads, and various industrial machinery and equipment.
The principle of the stepping motors and the ordinary DC alternating current motor is different. The stepping rotation is based on the current of different phases of the stator coil winding and the torque generated by the slots on the stator and the rotor.
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