What is the working principle of automatic doors?

Working principle of the automatic door sensor: When the automatic door sensor detects that someone is entering, it sends a pulse signal to the main controller, and the main controller informs the motor to run after judgment, and monitors the number of revolutions of the motor at the same time, so as to inform the motor to apply force at a certain time and enter a slow running. After the motor obtains a certain running current, it runs forward to transmit power to the synchronous belt, and then the synchronous belt transmits power to the spreader system to open the door leaf; After the door leaf is opened, the controller will make a judgment. If it is necessary to close the door, the motor will be informed to move in the opposite direction to close the door leaf. Principle of automatic door translation: when the induction detector detects someone entering, it will send a pulse signal to the main controller, and the main controller will inform the motor to run after judgment, and at the same time, monitor the number of revolutions of the motor, and inform the motor to exert force at a certain moment and enter a slow operation. After the motor obtains a certain running current, it runs forward to transmit power to the synchronous belt, and then the synchronous belt transmits power to the spreader system to open the door leaf; After the door leaf is opened, the controller will make a judgment. If it is necessary to close the door, the motor will be informed to move in the opposite direction to close the door leaf.