The emergence of gearless traction machine caters to the development needs of elevators, to meet the needs of environmental protection, but also to meet the interests of manufacturers. It was born not only for the needs of elevators in inorganic rooms, but also for energy saving and noise reduction. Survival of the fittest, we can see its infinite prospects (no rotating mechanism, low wear and tear, simple assembly, low noise, low energy consumption, fuel economy, smooth operation and easy maintenance, etc.)
The advantages of gearless traction machine are:
- Wear is low. The greatest advantage of the gearless tractor is that it has no rotating structure, and there is no place for mechanical wear except a set of bearings on the rotor shaft of the motor (which is also the traction shaft). Without abrasion, the service life of tractors is naturally prolonged.
- Energy saving. Because there is no transmission mechanism, there is no mechanical power loss, relatively speak. It also saves energy and operating expenses. The load is 1000KG. For example, the OTIS geared tractor (traction ratio is 1:1) needs 11KW and the gearless tractor (traction ratio is 2:1) only needs 6.7KW.
- Installation is simple. Because the tractor is directly fixed on the shaft of the motor, the structure is compact, light, easy to hoist and transport, so it is much easier to install in the field. For example, the load 1000KG, the speed of 1.0M/S variable frequency speed elevator: OTIS tooth tractor 17CT, self-weight 1300K, gear-less tractor WEB-1.0-1000, self-weight 300KG.
- Smooth operation. Because there is no transmission structure, there is no belt transmission of lost rotation, skid. The elevator has high accuracy and reliable operation, and there is no noise and vibration of gear operation. Thus, the elevator runs smoothly and the noise is low. This is also a prominent feature of the elevator green revolution.
- Safe oil. The gearless tractor has no transmission structure, so it saves the lubricating oil in the traditional reducer. It only has enough lubricating grease in the bearing. Daily maintenance does not have to replace the cumbersome lubricating oil, but also to avoid the pollution and maintenance difficulties caused by the leakage of lubricating oil, and save the cost of lubricating oil.
- Easy to use. Because the gearless tractor has no liquid lubricant, no leakage, not only no pollution, but also can be installed in any posture, such as foot hanging upward on the roof of the well.
Benefits of control systems for gearless traction machines:
The gearless traction machine has designed the “power short circuit” link, using the “permanent magnet synchronous motor”. Short connection of three-phase windings can be used as generator operation “this outstanding advantage, effectively avoid the elevator out of control. This link embodies the following advantages:
(1) When the elevator runs out of control (e.g. when the elevator stops running, and the brake failures can not be stopped) slipping occurs, because of winding short-circuit, power generation braking, in a very small speed will produce a great function, so that the speed of the elevator slipping becomes slow, will not cause the elevator damage passenger casualties tragedy.
(2) The gearless traction machine installed in the shaft and when a fault stop is needed to evacuate passengers outside the flat layer area, it can be operated conveniently outside the shaft by connecting the steel cable of the opening wrench; it is safe to open the gate and slide slowly into the flat layer position.
(3) When the elevator is heavily overloaded (for example, over the rated load of 150%) causing the elevator to sink, its sinking speed is very slow, will not cause passengers extreme panic and improve the safety and reliability of the elevator.
These are the advantages of gearless traction machine as above listed and we do believe that it will be better serve the public in the future.