A number of cables, the car is suspended in the lift shaft top of the computer room on the traction wheel. The other end of the cable is suspended for balanced counterweight. Weight is usually added to the car box with 50% load. When the compartment moves, the weight will move in the opposite direction. Traction wheel is to rely on the rough surface of the cable and the friction between the pits to pull the car. So when the cable or traction wheel is used, it must be replaced in a timely manner to prevent slippage. The motor is responsible for driving the traction wheel to rotate, providing power to rise or drop the car box. The electric motor may be AC or DC. Some motors should use gears to drive the traction wheel, and newer and faster lifts will generally adopt a gear-free drive. Some high-rise traction lifts also have weight compensation: there are a cables or chains attached to the floor in the car compartment and under the weight. The effect is to compensate for the weight change caused by the suspension of the car or the change in the length of the heavy cable. Traction elevator is bound to have a variety of safety devices to prevent the car because of cable breakage, braking failure and other causes of degradation. The minimum safety device includes a cable speed limiter installed in the engine room, and a safety clamp on the car compartment and on the weight. The safety clamp, the mechanical safety device invented by Otis, will automatically clamp the rails when accelerating to a certain speed and stop the car or the heavy brakes. At the bottom of the lifter, a buffer is also provided as a final protection.
The traction elevator generally needs to set up the room at the top of the well road. In recent years, the design of a new type of traction elevator, using fiber-cable composite cable, can reduce the required lubrication and maintenance. In addition, the new type of motor small size, can be installed in the main axle or wall, exempt from the room settings, known as the elevator room. The no room elevator was developed by Kone Elevator in Finland in 1996.