Open the door machine is composed of motor, variable speed institutions, on-off device a drive, mechanical and electronic door control equipment products. Now open the door machine different name. But according to the door machine used in classification, can be roughly divided into: wrought iron door, the door machine, courtyard door open, extendable doors open the door machine, garage door to open the door, revolving door, open the door machine, hanging door machine, garden door open the door machine, shutter door machine, industrial door to open the door machine, fenestration, and so on. According to the door machine from the current can be divided into the door open and dc machine communication.