Machines

Traction elevator are driven by either geared or gearless machine. Geared machine is usually used in medium rise buildings, geared machine comprises a high speed electric motor that drives the hoisting sheave troughh a gear unit.
Gearless machine is used in high rise buildings and provides maximum elevator speed, in which the drive sheave is an integral part of the motor armature.
The rotation output of the motor is transmitted to the elevator by a set of hoist ropes guidded around a grooved pulley or sheave, the car being at one end of the ropes and the counterweight at the other end.
Geared Machines
One of the first advancements inelevator technology was the introduction of worm gears in hoisting maachines. They provide high gear reduction ratios, making it posibble to use smaller, more compact machines to do the job earlier designs. The gear reduction unit sonsist of a horizontal steel worm that drives a bronze gear.
Gearless Machines
This machine design place the drive sheave directly on the motor shaft, this machine is used in high rise building construction that need high speed elevator to run