Roping 2: 1 Single Wrap Gearless Traction Machine For Passenger Lift

Roping 2:1 single wrap traction machine for passenger lift (SN-WJC-A)

The Gearless Traction Machine is a modern, high-efficiency drive system used in elevators, offering superior performance, energy savings, and reduced maintenance compared to traditional geared systems. It is commonly employed in mid- to high-rise buildings, where smooth, fast, and reliable vertical transportation is essential.

1. Structure and Key Components

• Permanent Magnet Synchronous Motor (PMSM): The core of the gearless machine, utilizing high-strength rare-earth magnets (e.g., neodymium) to generate torque without mechanical gears, improving efficiency.

• Traction Sheave: A grooved wheel that directly drives the elevator ropes (steel belts or cables) without a gearbox, reducing energy loss.

• Braking System: Electromagnetic brakes engage automatically in case of power failure or emergency stops.

• Variable Frequency Drive (VFD): Precisely controls motor speed and acceleration, ensuring smooth starts and stops while optimizing energy consumption.

• Compact Housing: The entire assembly is more space-efficient than geared machines, allowing for machine-room-less (MRL) elevator designs.

2. Working Principle

The gearless traction machine operates by converting electrical energy into mechanical motion via the PMSM. The motor’s rotor, integrated with the traction sheave, rotates to move the elevator cab and counterweight via friction between the ropes and sheave. The absence of gears eliminates energy losses from mechanical transmission, achieving efficiencies of over 90%.

3. Advantages Over Geared Systems

• Higher Energy Efficiency: No gear friction reduces power consumption by 20–40%.

• Smoother Ride: Precise VFD control minimizes vibrations and noise.

• Reduced Maintenance: Fewer moving parts (no gear oil changes or gear wear).

• Longer Lifespan: Less mechanical stress extends operational life.

• Space Savings: Enables machine-room-less (MRL) installations, maximizing building usability.

4. Applications

Gearless traction machines dominate modern elevators, especially in:

• High-speed elevators (≥2.5 m/s) for skyscrapers.

• Green buildings seeking energy-efficient solutions.

• Urban settings where space optimization is critical.

5. Maintenance Considerations

• Periodic inspection of motor bearings and brake systems.

• Monitoring rope tension and sheave wear.

• Ensuring proper cooling to prevent overheating.

Capacity:800kg~1000kg
Roping:2:1
Speed:1.0m/s~2.5m/s
Sheave:400mm
Single Wrap
Undercut U
Protection Rating:IP40
Insulation Class:F
Poles:32
Block Brake
Brake Voltage:DC110V

FAQ
1. Are the elevator wire ropes durable?
The elevator wire rope has special provisions and requirements. Configuration is not only for wire rope and rated load, but also considered the size of the traction, as a result, the tensile strength of wire rope is greater than the weight of the lift. The safety factor is equipped with more than four wire rope. So it won’t break at the same time.
2. Is it dangerous for power failure suddenly during the elevator running?
If it occurs, the elevator will automatically stop due to the electrical and mechanical safety device. In case of power failure,elevator brakes will automatically taken. In addition, the power supply departments such as planned outage, prior notice are also operating.
3. Will us be hurt when it closed suddenly?
In the closing process, if people touch the hall door, the door of elevator will automatically restart without any danger. With anti clamping switch, once the gate touched, this switching action make the elevator unable to be closed and even reopened. In addition, closing force is also available here.
4. How the elevator running?
Elevators are operated with a counterweight wire rope through the (tractor) traction drive, making ups and downs on the guide rail.
5. Is the escalator installation complicated?
We believe the functions of an escalator are not necessarily proportional to the operation complexity. Therefore, escalators designed by us apply an integrated structure, so that the equipment is more precise and more efficient and allows easier and more convenient commissioning.
6. Do you have any cerifications?
Yes, we do with ISO9001 / CCC / CE Certificates for u.