Gearless & Geared Elevators
Traction elevators are one of the most commonly used types of elevators. They use a rope and pulley system to raise and lower the elevator cab. The weight of their cab is balanced by using a counterweight, which was first introduced in 1900. Nowadays, some elevators are using steel belts in place of steel ropes. These steel belts are flat and extremely light because of the high friction coating, and carbon fibre core. Also, these belts do not require oil or lubricant. All these qualities make traction elevators energy efficient and best suited for high-rise applications.
These are three main types of traction elevators:
- Geared Traction Elevators
- Gearless Traction Elevators
- Machine Room-Less Traction Elevators
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elevator motor |
Geared Traction Elevators
These traction elevators have a gearbox which is attached to the electric motor and turns the hoisting sheave and moves the rope. Geared traction elevators are driven by either direct current (DC) or alternating current (AC) and their maximum speed is up to 500 ft. per minute. This speed limit is lower than gearless traction elevators but higher than many other types of elevators. Moreover, these elevators are capable of travelling to a maximum distance of 250 ft.Geared traction elevators have fair installation and maintenance costs, and low energy consumption.
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Gearless Traction Elevators
These traction elevators have the wheel directly attached to the electric motor. Gearless traction elevators have a very high travel speed i.e. up to 2000 ft. per minute and can travel a great distance. Their maximum travel distance is almost 2000 ft. and thus they are the best and the only choice for high-rise buildings. These elevators function using a wire cable (hoisting ropes) which is attached to the elevator top and wrapped around the sheave on one end. The other end of the cable is attached with a counterweight that raises and lowers in the hoistway. The weight of the cab and counterweight together press the cable which then turns the sheave and the elevator begins moving. To keep the load on the electric motor minimum, the counterweight is matched with the weight of the elevator cab and half-load of the passengers.
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