Stepping motor automatic deployment of step motor using the fitting, and the effect than traditional ac servo motor. Primary advantage is stepping motor has high efficiency, save electricity, low noise, high speed, high torque, continuous use of features and is not overheating stepper motor. Stepper motor drive cooperation T rack and synchronous belt can make automatic doors from low speed to high speed in the process of the branch is more secure. And selects the high performance power input, will not be affected because of the size of the voltage amplitude. In addition to the load when the instantaneous short circuit and over voltage and over current protection, ensure safe, durable and safe of the automatic door. Automatic doors, of course, on different occasions using planning, should also pay attention to the selection of the following equipment: a when selecting automatic door equipment, intelligent planning in intelligent control system, can be arbitrarily set door leaf speed, and can set ajar, convenient adjustment. The automatic door always stay in the best running state. And has the function of automatically correct, even if encounter caused strong breeze running resistance increases, can still keep smooth open close action. Two automatic rotary safety equipment, safety planning, when encounter obstacles or the abnormal conditions such as the human body, automatic doors turn out, and in the next resistance area near the end of the safe speed, prevent the phenomenon of events and parts damaged, improve the safety of automatic door at run time, extend the life of the automatic door. Doors open light and convenient, when power outage, aged, children and so on all can open and close, open and close strength in 3. Below 5 kg, convenient, safe and reliable.