What is A Traction Elevator

What is A Traction Elevator

A traction elevator operates by using an electric motor to drive the sheave; the motor pulls the cables by turning the sheave, with friction between the steel ropes and the sheave enabling the car to move up and down—similar to the principle of a movable pulley. The counterweight balances the car’s weight, ensuring smooth operation and reducing energy consumption. Traction elevators are currently the most widely used type of elevator, accounting for more than 90% of the elevator market share.

Traction elevators are most common in taller buildings. In some places in the world, these elevators can service more than 100 floors.

Core Components of Traction Elevators

Traction Machine: The power equipment of an elevator, whose function is to transmit and transfer power to enable the elevator to operate.

Steel Wire Rope: Connects the car and counterweight, and generates traction through friction with the hoist wheel.

Counterweight: Suspended on the opposite side of the hoisting steel wire rope relative to the car, it serves to balance the car.

Traction Sheave: Installed on the traction machine, it drives the steel rope by rotating to lift and lower the car.

Guide Wheel: Ensures that the car and counterweight run along the guide rails in the hoistway.
Braking system: Ensures that the elevator stops safely.

Control System: Acts as the “brain” of the elevator, managing all operations including vertical movement, speed control, and stopping at designated floors.

Pros of Traction Elevators

High Speed: Speed ranges from 0.5 m/s to 20 m/s, particularly suitable for high-rise and super-high-rise buildings.

Safe and Reliable: Multiple braking protection systems.

Long Service Life: Service life can exceed 20 years.

Energy-efficient: Utilizes motor-driven technology, especially permanent magnet synchronous gearless traction technology, resulting in energy consumption 30%-50% lower than hydraulic elevators.

Customizable: Flexible design and decoration options to suit various architectural styles.

Cons of Traction Elevators

Cost: Higher cost compared to other types of elevators.
High building requirements: Requires construction of a shaft, pit, and top clearance, with the suspension system needing sufficient height and space.
Maintenance: Regular inspection and replacement of components such as steel ropes and traction wheels are required, with a higher maintenance frequency.

Geared Vs. Gearless Traction Elevators

Traction elevators are classified into geared traction elevators and gearless traction elevators based on whether they have a gear mechanism.
Geared traction machines are primarily used in low-speed and high-speed AC elevators; gearless traction machines are used in high-speed DC elevators.

In geared traction elevators, the motor drives the traction wheel through a reduction gearbox. The gearbox reduces the motor speed and increases torque. The commonly used motor is an AC asynchronous motor.

In gearless traction elevators, the motor is directly connected to the traction wheel without a gearbox. Low-speed, high-torque permanent magnet synchronous motors (PMSM) are used, with speed and torque directly output by the motor and precisely controlled by a variable frequency drive.

Here are the main differences:

Traction elevators offer users greater overall value thanks to their outstanding operating efficiency and riding comfort. Contact Dazen today for the best traction elevator solution for your building.