Main features 
1, the general accuracy of the stepper motor step angle of 3-5%, and not cumulative. 
2, the appearance of the stepping motor maximum allowable temperature. 
Stepper motor temperature is too high the first magnetic demagnetization of the motor, 
resulting in decreased torque even in the desynchronization, and therefore the maximum motor surface temperature should be allowed depends on the point different motors demagnetization magnetic material; in general, the magnetic material demagnetization points are above 130 degrees Celsius, and some even as high as 200 degrees Celsius, so the appearance of stepper motor completely normal temperatures 80-90 degrees Celsius. 
3, the torque of the stepping motor will be decreased with increased speed. 
When the rotation of the stepping motor, the inductance of each phase winding of the motor will form a back electromotive force; the higher the frequency, the greater the back electromotive force. In its role, with increasing motor frequency (or velocity) of the phase current is reduced, resulting in decreased torque. 
4, the normal operation of the stepping motor can be low speed, but if the speed is not higher than a certain start, accompanied by howling. 
Stepper motor has a technical parameters: load starting frequency, i.e., the stepping motor in no-load condition to start the normal pulse frequency, if the pulse frequency is higher than this value, the motor does not start properly, or the step may occur out of stall. In the case of a load, start frequency should be lower. If you want to achieve high speed rotation of the motor, the pulse frequency should speed up the process, i.e., a lower starting frequency and acceleration to rise to a certain desired frequency (motor speed from low rise to high speed). 
Stepper motor with its significant features, in the era of digital manufacturing play a significant purpose. With the improvement of different digital technologies and the development of stepping motor technology itself, the stepper motor will be applied in more fields. 
The main characteristic of 
a stepping motor drives can be added to the operation, the driving signal must be a pulse signal, 
no pulse when the stepping motor is stationary, if appropriate addition of a pulse signal, will be at a certain angle (called step angle) rotation. And a rotational speed proportional to the frequency of the pulses.
2, a three-phase stepper motor step angle is 7.5 degrees, 360 degrees revolution, to complete the required 48 pulses. 
3, the stepping motor having superior characteristics rapid starting and stopping. 
4, changing the order of the pulses, can easily change the direction of rotation. 
Thus, printers, plotters, and other robotic devices are stepper motor driven core.