When we talk about automatic door, you will think about supermarket automatic sliding door. Do you know how it work? The main parts are automatic door motor, controller, belt, power supply, and sensor or switches etc.
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When people or some moveable project pass through the automatic door, the sensor will reaction, and send a singal to controller, then the controller will let the automatic door brushless motor work and drive the belt working, because the belt connect the hanger with the sliding door leaf. Therefore the door opened. After few sencods, the controller will give a singal to motor to do reserve movement, then the door will automatically closed.