Elevator Traction Machine

Rope elevators are driven by the traction machine located in the rooftop machine room. There are geared- and gearless-type traction machines. The gearless-type traction machine, through the latest inverter control, offers smoother acceleration and deceleration than the geared-type traction machine which uses a reducer.In a "traction" elevator, the elevator cab is pulled up by means of 'rolling' steel ropes over a deeply grooved pulley, commonly called a 'sheave'. The friction between the ropes and the pulley produces the traction which gives this type of elevator its name.A hydraulic elevator uses an electronic pump that pushes oil into a cylinder where the pressure is increased, pushing a piston and causing the elevator to rise. A traction elevator, on the other hand, uses a system of cables, pulleys, and counterweights to lift the cab.