Passenger ElevatorAutomatic Door Elevator

An automatic passenger lift uses a power-operated door operator on the car to open and close both the car door and the landing door together. A door coupler engages the landing door as the car arrives, so passengers never touch the doors.

Modern systems combine a gearless permanent-magnet machine, a variable-frequency drive and a microprocessor controller. That package delivers smooth acceleration, accurate floor levelling and lower energy use than older geared systems.

Door speed, opening width and sensor coverage have more effect on perceived performance than a small difference in rated speed. A full-height infrared light curtain should detect obstructions across the doorway; a narrow beam or a single mechanical edge is not enough for a busy lobby.

Centre-opening doors give the fastest boarding for most buildings. Telescopic or two-speed doors can fit a narrower landing opening. For hospitals and goods traffic, the clear opening must be checked against the actual bed, trolley or pallet.

Capacity is not just the number on the car door. It is the combination of car floor area, rated load, door width and the building's peak traffic. For apartments, a 6–8 person lift is common; for offices, traffic analysis may call for a group of larger cars.

Speed should follow the number of stops and the building height. A 2 m/s machine in a 4-storey building adds cost without improving the journey much. In taller buildings, speed and group control become important for waiting time and handling capacity.

Automatic lifts should include door interlocks, an overspeed governor and safety gear, buffers, overload detection, emergency alarm, emergency lighting and an automatic rescue device. The controller should log faults so service engineers can diagnose intermittent problems.

Ask for the maintenance scope in writing: how often the lift is visited, what is inspected, which consumables are included and how breakdown response is measured. A lift is a long-life asset, and the service relationship matters as much as the initial price.