Elevator technology
Traction is the workhorse of modern vertical transport. This guide explains the ropes, sheave, counterweight and machine choices behind a reliable traction lift.
8 min read · Updated November 2026
Reference photography is representative. Final system selection is confirmed after a site survey.
Justin Elevators engineering desk · Bengaluru
How it works
Traction elevators are the most widely used elevator type globally, accounting for over 90% of the elevator market. They operate using an electric motor that drives a sheave, with steel ropes connecting the elevator car to a counterweight. The friction between the ropes and the sheave enables smooth, efficient vertical movement. Traction elevators are the preferred choice for mid to high-rise buildings due to their superior speed, energy efficiency, and ride comfort.
01
A traction lift hangs the car on one side of a hoist rope and a counterweight on the other. The rope passes over a grooved drive sheave. When the motor turns the sheave, friction between the rope and the groove moves the car.
The counterweight balances most of the car's weight, so the motor mainly overcomes the difference between the car load and the counterweight. That is why traction lifts are more efficient than lifting the full car weight directly.
02
A geared machine uses a gearbox to multiply torque. It is robust and familiar, but the gearbox adds friction, noise and maintenance. A gearless machine couples the sheave directly to a permanent-magnet motor, reducing losses and improving ride quality.
Machine-room-less traction packages move a compact gearless machine into the hoistway. They save building space and are common in low- and mid-rise projects. The trade-off is that service access and heat dissipation need to be designed carefully.
03
Traction is the default for buildings above five or six floors because hydraulic travel becomes impractical. It is also the better choice for high traffic, where speed and energy efficiency matter over the building's life.
For a low-rise villa with occasional use, a hydraulic lift may be simpler and cheaper. For an apartment building with daily traffic, traction is usually the better long-term investment.
04
The service visit should inspect rope condition and equal tension, sheave grooves, brake performance, guide shoes, governor and safety gear, door operation and controller faults. Rope replacement should be planned from measured wear, not left until a failure.
Keep the machine room ventilated and clean. Record brake adjustments, rope measurements and safety-gear tests so the building has an auditable maintenance history.
Inside the system
A traction elevator is more than a motor and a car. These are the assemblies that determine safety, ride quality and service life.
01
The heart of the system, consisting of an electric motor, drive sheave, and brake. It generates the rotational force that moves the elevator car.
02
A grooved wheel that transmits the motor's power to the hoist ropes through friction. The groove design is critical for traction performance.
03
Multiple steel wire ropes (typically 4-8) that connect the car to the counterweight. Each rope alone can support the full load for redundancy.
04
A weighted frame that balances the car's weight, reducing motor workload by approximately 40-50%. Moves on its own guide rails.
05
The passenger or goods compartment that travels within the hoistway. Includes the car frame, platform, walls, ceiling, and doors.
06
Vertical steel rails that guide the car and counterweight, ensuring smooth and precise movement throughout the hoistway.
07
The electronic brain that manages all operations, speed, acceleration, floor positioning, door operation, and safety monitoring.
08
A critical safety device that activates the safety gear if the elevator exceeds its rated speed by more than 15%.
Where it fits
Safety
Advantages
Trade-offs
Before you order
Questions
The answers below are general guidance. Your building, local code and intended use determine the final specification.
Traction lifts can serve very tall buildings, with speeds well above 6 m/s in high-rise applications. The practical limit depends on the machine, rope or belt system, building sway and code requirements.
For regular use in taller buildings, yes. The counterweight reduces the energy needed to move the car. In very low-use buildings, standby power and the hydraulic system's simplicity can change the comparison.
No. Machine-room-less traction systems place a compact machine in the hoistway. A conventional geared or larger gearless machine may still need a dedicated machine room.
Rope life depends on load, sheave condition, alignment and maintenance. It is measured by inspection, not by a fixed calendar interval. Replace ropes when the manufacturer's wear criteria are reached.
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We compare traction elevator systems against your building, traffic and maintenance needs before recommending an installation.
