The principle of stepper motor is as follows:

1. The stepper motor is controlled by pulse signal. Each time a pulse is input, the stepper motor is pushed forward one step.

2. The rotation step angle of the stepping motor is based on the structure of the motor and is realized in a certain proportion.

3. In practice, there will be slight differences in the rotation step angle of the motor. This is because the structure of the motor is fixed, and the total number of poles will not be accumulated, and the higher the processing accuracy will be. In general, the step angle of an industrial hybrid stepper motor is 1.8°, or 200 poles. (equivalent to synchronization)

Extension: A stepper motor is an open-loop control element that converts electrical pulse signals into angular displacement or linear displacement. In the case of non-overload, the position where the motor's speed stops depends only on the frequency and number of pulses of the pulse signal, and is 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 fact that the stepping motor has only periodic errors and no cumulative errors. It makes it very simple to control with stepper motors in the control fields such as speed and position. Although stepper motors have been widely used, stepper motors are not like ordinary DC motors, and AC motors are conventionally used. It must be used by the control system composed of double ring pulse signal, power drive circuit, etc. Therefore, it is not easy to make good use of stepper motors. It involves many professional knowledge such as machinery, motors, electronics and computers. At present, there are indeed many manufacturers of stepper motors, but there are professional and technical personnel who can develop them by themselves. However, there are very few manufacturers. Most of the manufacturers only have one or twenty people, and they do not even have the most basic equipment. Only in a blind imitation stage. This causes a lot of trouble for users in product selection and use. In view of the above situation, we decided to take a wide range of induction sub-type stepper motors as an example. Describe its basic working principle. Hope to be helpful to the majority of users in the selection, use, and improvement of the whole machine.