traction elevator
If the compensation system uses cables, there will be an additional sheave in the pit below the elevator, to guide the cables. The typical traction elevator machine requires about, on average, 120 sq feet for the machine.
While the lift rates are slower than in a typical gearless elevator, the gear reduction offers the advantage of requiring a less powerful motor to turn the sheave. The MRL application utilizes a drive sheave, motor, counterweight, and ropes which are the same components used by the geared and gearless traction elevator. Elevators with more than 100 ft (30 m) or the speed is 2.5m/s or above of travel have a system called compensation. Contemporary cheaper installations, such as those in residential buildings and low-traffic commercial applications generally used a single or two speed AC hoist machine (abbreviation is AC/Machine Room Ride on 1972 Otis Geared Traction Elevator @ 157-161 George St, Liverpool1972 Otis geared traction elevator at 157-161 George St, Liverpool, Sydney, Australia (video: Jaymie Treadwell).Gearless traction electric elevator first invented by In a gearless traction machine, five to eight lengths of wire cable, known as hoisting ropes (or wire ropes), are attached to the top of the elevator and wrapped around the drive sheave in special grooves. The traction version of the machine room less (MRL) elevators are usually implemented with the smaller gearless traction motor that can place the inside the shaft to make the spaces not reduced by the large size motor.
They are, however, more energy efficient than geared traction elevators.Compared to traction elevators, hydraulic systems are:Hydraulic elevators are most often found in buildings that serve up to five stories because they operate at slower speeds than other types of elevators — typically 150 ft./min. Traction elevators require comparatively more space. It is used on geared traction or high speed elevators. For example, Thyssenkrupp has a There are different types of elevators for a reason. But new traction system called machine room less lifts require much lesser space.So make sure to consider all these factors before choosing the right elevator between hydraulic and traction systems. Traction Elevators are lift systems that use an electric hoisting machine and hoisting cables to raise and lower the elevator car vertically along guide rails. Traction Elevators. Elevator cars are pulled up by means of rolling steel ropes over a deeply grooved pulley, commonly called a sheave in the industry. The weight of the car is balanced by a counterweight since 1900. This counterweight process also means no fluids such as hydraulic fluid are needed to power the system. Traction elevators mostly require more space and are bulkier. A number of hydraulic lifts can be installed with the machine room being situated at the top of the shaft.
With this design, the motor doesn’t have to move as much weight, making it much more energy efficient than hydraulic systems.Traction elevators are the most common type of elevator. So eliminating the machine room can save an average of 120 square feet per elevator. As VP of Operations for Stanley Elevator, Ryan oversees the field, construction and modernization teams.
The grooved sheave in this traditional gearless system is quite large, from 0.6 to 1.2 meters (2–4 ft) in diameter. Some elevator manufacturers have use this technology such as Geared traction machines are driven by AC or DC electric motors. The combined weight of the elevator car and the counterweight presses the cables into the grooves on the drive sheave, providing the necessary traction as the sheave turns. As the name implies, the electric motor in this design drives a worm-and-gear-type reduction unit, which turns the hoisting sheave. This is a separate set of cables or a chain attached to the bottom of the counterweight and the bottom of the elevator cab.
This makes it easier to control the elevator, as it compensates for the differing weight of cable between the hoist and the cab. Capacity: Up to 6,500 lbs Travel Height: Up to 500 ft Speed: 100 ft/min to 350 ft/min (geared) / 200 ft/min to 2,000 ft/min (gearless) Drive: Traction Geared, Traction Gearless
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