UWE Slewing Rings for renewable energies

UWE slewing ring has specialized exclusively on supplying system manufacturers in the renewable energy sector.
UWE slewing ring manufacturers of single-row and double-row ball slewing rings used as blade and yaw bearings, as well as for azimuth gear rims to a diameter of 4500 mm.
These are used for onshore and offshore wind turbines in the 100 kW to 7MW range. Roller slewing rings from UWE slewing ring are in use as single main bearings for gear- and shaftless wind turbines.

Small wind turbines

Small wind turbines may be used for a variety of applications including on- or off-grid residences, telecom towers, offshore platforms, rural schools and clinics, remote monitoring and other purposes that require energy where there is no electric grid, or where the grid is unstable. Small wind turbines may be as small as a fifty-watt generator for boat or caravan use. Hybrid solar and wind powered units are increasingly being used for traffic signage, particularly in rural locations, as they avoid the need to lay long cables from the nearest mains connection point. The U.S. Department of Energy's National Renewable Energy Laboratory (NREL) defines small wind turbines as those smaller than or equal to 100 kilowatts.Small units often have direct drive generators, direct current output, aeroelastic blades, lifetime bearings and use a vane to point into the wind.
UWE bearing provide yaw, blade/pitch bearing and yaw bearing to our customers reliably. UWE wind turbine generator bearing is for 3KW-5MW wind turbine.Each wind turbine generator comprises of one yaw bearing and three pitch bearings, the material of the rolling rings is 42CrMo with quenching and tempering. Raceway surface intermediate frequency induction hardened. Due to complexity of the stress situation, the bearing must bear impact and carry high load. 20 years is a required lifetime for the wind turbine generator, it is also required by yaw bearing and pitch bearings as the mounting cost is too high.

Advantages of Wind Energy

Wind energy produces no polluting emissions of any kind, including those that cause global warming.
Wind turbines use a fuel that's free, inexhaustible and immune from the drastic price swings to which fossil fuels are subject.
With careful siting and outreach to the local community, wind farms can be built in a fraction of the time it takes to construct coal or natural-gas power plants. A 50-megawatt wind farm can be completed in less than a year.
In the right location, it takes only three to eight months for a wind energy farm to recoup the energy consumed by its building and installation -- one of the fastest "energy payback times" of any energy technology on the market.
Although bird and bat safety are ongoing concerns, wind power does not contribute to the plethora of other environmental and public health costs caused by conventional fossil power production: acid rain in lakes, mercury in fish, particulate-matter respiratory illnesses, coal mine slag, nuclear waste fuel storage, and so on. The National Academy of Sciences estimates that electricity generation from coal, oil-fueled vehicles and transportation, and electricity production from natural gas caused an estimated $120 billion in damages in 2005, with health-related damages accounting for almost all of these costs.
The growing use of wind energy creates manufacturing and technical jobs, and significantly more jobs per dollar invested compared to non-renewables technology, according to the National Renewable Energy Laboratory.
Wind power consumes no water during operation. This will be an increasingly important attribute as the water-energy nexus grows in importance and as water use becomes an increasingly important facet of defining sustainability.

Electricity from wind

Germany, the US, Spain, Denmark, India and Australia are among the world's leading nations in the acquisition of wind energy. Wind generated energy is growing in leaps and bounds.

Wind power is now the world's fastest growing energy source and has also become one of the most rapidly expanding industries, with sales of roughly $3 billion in 2008. Major offshore developments are likely in northern European waters in the early part of the next century.

This will be the next major step for this technology and will result in a dramatic increase in decentralized electricity generation. Offshore wind has the potential to deliver substantial quantities of energy at a price that is cheaper than most of the other renewable energies, as wind speeds are generally higher offshore than on land

As of 1999, global wind energy capacity topped 10,000 megawatts, which is approximately 16 billion kilowatt-hours of electricity. That's enough to serve over 5 cities the size of Miami , according to the American Wind Energy Association. Five Miamis may not seem significant, but if we make the predicted strides in the near future, wind power could be one of our main sources of electricity. "With today's technology, wind energy could provide 20% of America 's electricity (or about the amount nuclear power provides) with turbines installed on less than 1% of its land area. And within that area, less than 5% of the land would be occupied by wind equipment the remaining 95% could continue to be used for farming or ranching." By the year 2010, 10 million average American homes may be supplied by wind power, preventing 100 million metric tons of CO 2 emissions every year.

offshore wind,wave and tidal energy

Harnessing energy from offshore winds, waves, and tides holds great promise for our nation's clean energy future. Energy production is just one of the valuable resources our oceans and coastal ecosystems provide. We can successfully develop offshore renewable energy by ensuring that energy projects are sited, designed, and constructed in a manner that protects our fragile ocean ecosystems.

what is renewable energy?

Renewable energy comes from natural sources that are constantly and sustainably replenished. The technologies featured here will make our families healthier, more secure, and more prosperous by improving our air quality, reducing our reliance on fossil fuels, curbing global warming, adding good jobs to the economy and -- when they're properly sited -- protecting environmental values such as habitat and water quality. Working together, policymakers, communities, businesses, investors, utilities, and farmers can help build a sustainable future for America and the planet.

Slewing ring for wind energy

UWE is a leading Chinese supplier of blade bearing and yaw bearings for wind energy, from Small Wind Turbines of 750kW to the latest Multi-MW Offshore turbines up to 5MW.
The custom designed UWE slewing bearings are engineered in close cooperation with turbine manufacturers: our dedicated engineering team is at your service for new developments and design optimisation.UWE slewing bearings are delivered worldwide.

Gamesa purchasing manager will visit UWE

UWE will be visited by Gamesa(global technological leader in the wind industry) purchasing managers Bob and Peter.They will come on 30 July. All UWE staff  highly value this chance. After Vestas visit on April, UWE has perfected management system, improved quality control and optimized test equipment, and we are confident that our strength will earn this big customer.
Wind power bearings need high precision and long service life, 20 years is a required lifetime for the wind turbine generator, it is also required by yaw bearing and pitch bearings as the mounting cost is too high. A full set of quality control documents,raw material quality certificate,finished product inspection will ensure the high and strict requirement.
UWE all colleagues are here waiting for everyone coming and having disscusion.

033.35.1900.03K2 blade bearing/pitch bearing

033.35.1900.03K2 is UWE blade bearing number for 1.5MW wind turbine.It is double row ball slewing bearing with internal gear.
3.Material: 42CrMo.
4.Clearance: Blade bearings clearance is "negative clearance". 
5.Anticorrosion: sandblasting and zinc coating should be applied consequently, the layer thickness should be 60 ~ 200μm. The outer diameter surface should be sealing treatment with painting.
6.Sealing: anti-aging, high / low temperature resistance, well sealed, non-flaking and non-leakage. Normally, the German brand Simrit common used.
7.Starting moment: generally, the starting moment measurement under the condition is at the rotating speed > 0.1rpm, temperature 15 ℃ ~ 20 ℃ with empty loading. Starting moment should be controlled to start at a specified range. Starting moment value can indirectly reflect the size of the internal clearance, which is the key to guarantee the normal work of the bearing. The starting moment should be test on the testing machine. And this is necessary for each bearing.. In some applications, the simulative test is required.
UWE is a leading Chinese supplier of blade bearing and yaw bearings for wind energy, from Small Wind Turbines of 5kW to the latest Multi-MW Offshore turbines up to 5MW.
The custom designed UWE slewing bearings are engineered in close cooperation with turbine manufacturers: our dedicated engineering team is at your service for new developments and design optimisation.UWE slewing bearings are delivered worldwide.

Slewing Ring Bearing for Wind Turbines

Except to support higher titling moment, the wind turbine slewing bearing can also much more complicated fatigued load due to aerodynamic and impeller revolving, additional with the requirements of high reliability and long life, so dynamic support capacity must be considered when in type-selection and designing of the wind turbine slewing ring bearing, mainly for the anti-fatigued life of the roller path.
Type-selection for the wind turbine slewing ring, especially for the variation-impeller slewing ring, is still in discussion. In accordance with installation and application status, it is commonly use the double-row four-contact ball bearing for the variation-impeller bearing, and for the yaw-navigation slewing ring bearing, usually it is using single-row four-contact ball bearing, and also the cross roller bearing but not commonly used.
Quality of the slewing ring bearing is mainly due to quality of its roller path, including machine work quality and heat treatment quality. And quality of the roller path is based on equipment and technique guarantee, so the critical point for assuring quality of the slewing ring bearing is properly selection of equipment and technique.
Wind  turbine slewing ring bearing is mainly used in bad environment, so requirements for lubricating, sealing and anticorrosion are strict, by using proper lubricating grease and method, sealing material and structure, anticorrosion technique.
Slewing ringis a kind of large-scale bearing, possessing driving gears in either internal ring or external ring, used for matching gear engagement with driving pinion for driving torgue, in wind turbine, commonly used for pitch and yaw system of wind turbine which endures complex load and is difficult to disassemble, assemble and maintain.Therefore, the wind turbine slewing ring bearing is more strictly in design and manufacture. Generally, life requirement for the wind turbine slewing ring bearing should be as the same as that of the wind turbine unit, and should be more than 20 years. 


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