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
Load
kg | Speed
m/s | Rated
Output
kW | Rated
current
A | Rated
speed
rpm | Frequency
Hz | Sheave
Diameter
mm | Torque
Nm | Ropes | Groove
Dist
mm | Cut
Angle | Groove
Angle | Shaft
Load
kg | Turninng
Gear | Remote
Release | Inertia
kg m^2 | Weight
kg |
| 800 | 1 | 5.4 | 14 | 95 | 25.3 | 400 | 543 | 5- Φ 10 | 16 | β=95° | y=30° | 3,000 | y | y | 3.45 | 293 |
| 800 | 1.5 | 8.1 | 23 | 143 | 38.1 | 400 | 540 | 5- Φ 10 | 16 | β=95° | y=30° | 3,000 | y | y | 3.45 | 293 |
| 800 | 1.6 | 8.6 | 23 | 153 | 40.8 | 400 | 537 | 5- Φ 10 | 16 | β=95° | y=30° | 3,000 | y | y | 3.45 | 293 |
| 800 | 1.75 | 9.6 | 23 | 167 | 44.5 | 400 | 549 | 5- Φ 10 | 16 | β=95° | y=30° | 3,000 | y | y | 3.45 | 293 |
| 800 | 2 | 11 | 26.5 | 191 | 50.9 | 400 | 550 | 5- Φ 10 | 16 | β=95° | y=30° | 3,000 | y | y | 3.77 | 303 |
| 800 | 2.5 | 13.8 | 32.5 | 239 | 63.7 | 400 | 550 | 5- Φ 10 | 16 | β=95° | y=30° | 3,000 | y | y | 3.77 | 303 |
| 1000 | 1 | 6.4 | 16.5 | 95 | 25.3 | 400 | 640 | 5- Φ 10 | 16 | β=95° | y=30° | 3,000 | y | y | 3.77 | 303 |
| 1000 | 1.5 | 10 | 28 | 143 | 38.1 | 400 | 665 | 5- Φ 10 | 16 | β=95° | y=30° | 3,000 | y | y | 3.77 | 303 |
| 1000 | 1.6 | 10.7 | 28 | 153 | 40.8 | 400 | 665 | 5- Φ 10 | 16 | β=95° | y=30° | 3,000 | y | y | 3.77 | 303 |
| 1000 | 1.75 | 11.7 | 28 | 167 | 44.5 | 400 | 669 | 5- Φ 10 | 16 | β=95° | y=30° | 3,000 | y | y | 3.77 | 303 |
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.
