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 speed and stop position of the motor only depend on the frequency and number of pulses of the pulse signal, and are not affected by load changes, that is, when a pulse signal is added to the motor, the motor rotates a step angle. The existence of this linear relationship, coupled with the characteristics of stepper motors that only have periodic errors but no cumulative errors, makes it very simple to use stepper motors to control speed, position and other control fields.
Although stepper motors have been widely used, stepper motors cannot be used in the same conventional way as ordinary DC motors and AC motors. It must be composed of a control system consisting of dual-ring pulse signals, power drive circuits, etc. before it can be used. Therefore, it is not easy to use stepper motors well, which involves many professional knowledge such as machinery, motors, electronics and computers.
Nowadays, there are indeed many manufacturers that produce stepper motors, but there are very few manufacturers that have professional technicians and can develop and research on their own. Most manufacturers have only one or twenty people and do not even have the most basic equipment. They are 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 the widely used induction stepper motor as an example to describe its basic working principle. We hope it will be helpful to users in product selection, use, and machine improvement.
