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Welcome to Classroom on demand, your source for educational materials related to the vertical transportation industry. This site represents the knowledge and expertise of the best engineers and mechanics in the elevator industry, and will help those new to the elevator industry learn about the basic workings of elevator systems, and also will serve as a reference for people with more experience.

Gearless Traction Machine

This example shows the drive system of an overhead gearless traction equipment type. (see file 1010-2) The overhead machine room contains the gearless machine motor and drive sheave that coordinate to move the ropes, which raise and lower the car and the counterweight.
This application utilizes a drive sheave, motor, counterweight, and ropes which are the same components used by the geared traction elevator. This application can be used for front openings as well as front and rear opening configurations.
The gearless traction drive sheave has "U" shaped grooves, allowing it to grip (friction) the ropes. This creates traction and moves the car.
The electric motor interfaces directly with the drive sheave.
The gearless machine, along with the related drive equipment, is located above the hoistway in a penthouse or overhead machine room. The gearless machine is not used for basement applications.
Advantages
• The floor to floor flight times are quicker.
• This design offers almost unlimited travel.
• Gearless traction car speeds are typically much faster than those of Geared traction applications. Geared traction cars can move at 500 fpm (2.5 m/s) or less and gearless traction cars move at speeds of 500 to 1,600 fpm (2.5 to 8.1 m/s).
• A wide range of capacities for both passenger and freight applications
• Because of the motor design, the gearless application develops higher torque and runs at lower RPMs giving the gearless machine a long lifetime.
Disadvantages
• The material cost and the installation time are substantially higher when compared to a geared traction elevator application.
• There are structural building considerations, since the loading forces are larger for the gearless application.
• Elevator maintenance cost is generally higher (compared to geared elevators).

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