The so-called stepping motor is a kind of electrical pulse into angular displacement of the actuator. More generally, when the stepper driver receives a pulse signal, it drives the stepper motor to turn a fixed Angle in a set direction.
We can control the angular displacement of the motor by controlling the number of pulses, so as to achieve the purpose of accurate positioning; At the same time, it can control the speed and acceleration of the motor by controlling the pulse frequency, so as to achieve the purpose of speed regulation.
At present, the more commonly used stepping motors include reactive stepping motor , permanent magnet stepping motor , hybrid stepping motor and single-phase stepping motor.
The main difference between stepper motors and ordinary motors is the form of impulse drive, and it is this feature that stepper motors can be combined with modern digital control technology.
However, the stepper motor is inferior to the traditional closed-loop DC servo motor in terms of control accuracy, speed variation range and low speed performance. So the main application in the precision requirement is not particularly high occasions.
Stepping motor is widely used in various fields of production practice because of its simple structure, high reliability and low cost. Especially in the field of CNC machine tool manufacturing, stepping motor has been considered as the most ideal actuator for CNC machine tools because it can directly convert digital pulse signals into angular displacements without A/D conversion.
In addition to their applications in CNC machine tools, stepper motors can also be used in other mechanical applications, such as motors in automatic feeders, motors in universal floppy disk drives, and also in printers and plotters.
In addition, stepping motor also has many defects:
Because the stepper motor has no-load start frequency, so the stepper motor can run normally at low speed, but if it is higher than a certain speed, it can not start, and accompanied by sharp noise; The precision of the subdivision drive of different manufacturers may be very different, the greater the fine fraction, the more difficult to control the precision; Moreover, the stepper motor has large vibration and noise when rotating at low speed.
