Accurate Positioning For Automatic Revolving Door Wings

The automatic revolving doors are the most popular entrance solution for the main door area of hotels/resorts, shopping malls, office buildings, hospital and other type of projects .It's easy for us to see the revolving door wings always start, stop or be locked at the accurate postion, do you know how it works ?

Automatic revolving door wings realized the accurate positioning by a encoder, combination of sensors, control systems, driving system and mechanical components, the details are as following. The encoder feedback-->servo control-->dynamic braking-->sensor fusion-->main control unit (PLC) .

▪  Positioning Radars/Sensors

Optical or magnetic sensors detect the exact angle and position of each door wing as it rotates.

Encoders (rotary or linear) provide real-time feedback on the door's movement.

▪  Control System (PLC or Microcontroller)

A programmable logic controller (PLC) or embedded microcontroller processes sensor data.

It adjusts the motor’s speed and direction to ensure smooth and accurate positioning.

▪  Motor & Driving System

A servo or stepper motor (often gear-driven) allows for precise rotational control.

Some doors use a belt or chain drive system with tension adjustment to prevent slippage.

▪  Safety & Calibration

Infrared or radar sensors ensure no obstructions are present before stopping.

The system regularly self-calibrates to account for mechanical wear or environmental changes.

▪  Speed Synchronization

Multiple wings (typically 2/3/4 wings) are synchronized via the control unit to maintain even spacing.

Emergency brakes or clutches engage if misalignment is detected.