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Wind Turbine Business

Wind turbine technology continues to evolve at a constant pace.

NTN undertakes the manufacture of component technology that will facilitate the spread of environmentally-friendly wind turbines, by providing products that help realize “harmony with the natural environment,” “solve energy problems (global warming),” and “contribute to global society.”

Nacelle is the Core of the Wind Turbines

The nacelle is a box-shaped housing unit installed next to the turbine’s blade whose rotation is powered by the wind. Equipped inside the nacelle is a main shaft that enables the rotation of the blade; a gearbox which increases the rotation speed in order to generate electric power; a generator which converts the wind power to electrical power; and a yaw drive that changes the direction of the turbine in accordance with the direction of the wind. NTN bearings are employed in each one of these mechanisms.

Diagram:Nacelle is the Core of the Wind Turbines

“Asymmetrical Spherical Roller Bearings” for Wind Turbine Main Shafts

NTN has developed the “Asymmetrical Spherical Roller Bearings” for wind turbine main shafts that feature an asymmetrical design of left and right rollers within the bearing that improves the calculated operating life of the bearing by approximately 2.5-times compared to conventional products, and reduces the PV value*1 by approximately 30% for better wear-resistance characteristics.

*1) Value combining the contact surface pressure [P] and rolling sliding velocity [V]. (Rolling sliding is the sliding caused by the difference in speeds between the contact areas of the roller and raceway surface in the direction of rotation)

Features
1. Asymmetrical design of left/right roller rows asymmetrical design with different length and contact angles between the rollers in the left and right rows
2. Long operating life approximately 2.5-times*2 improvement to calculated operating life (compared to conventional products)
3. Wear-resistance better wear-resistance characteristics by approximately 30%*2 reduction in PV value (compared to conventional products)
4. Same boundary dimensions can be designed with the same boundary dimensions as conventional products
5. Compact and lightweight
(when designing new turbines)
can be designed with approximately 10% reduction in inner diameter and 30% reduction in weight for main shaft bearings with the same operating life as conventional products
6. Roller stability designed with center rib on the inner ring so the maximum diameter position is away from the center to prevent roller skewing

*2) Calculated by NTN under average fatigue load conditions acting on wind turbine main shaft bearings

Product photo
The developed product Cross-section of the developed product Cross-section of the conventional product
The developed product Cross-section of
the developed product
Cross-section of
the conventional product
Internal structure of wind turbine (example) Axial load acting on wind turbine main shaft bearing
Internal structure of wind turbine (example) Axial load acting on wind turbine main shaft bearing

Condition Monitoring System for Wind Turbines “Wind Doctor™”

Applying its bearing diagnostics technology, which has been cultivated by the company over many years, NTN has developed the Condition Monitoring System for Wind Turbines (CMS), which uses the world’s smallest data collection device (based on in-house research).

Features

Photo : Condition Monitoring System for Wind Turbines “Wind Doctor™”

  1. World's smallest class data collection device (250×320×103 mm)
    →  Compact and space-efficient, allowing easy installation in existing nacelles.
  2. Suited to offshore installations and a wide range of other environments (usage temperature conditions: -20 to 60 °C).
    →  Outstanding levels of water and dust-proofing
  3. Highly reliable diagnosis information
    →  Automatic diagnosis function using highly accurate measurements, as well as allowing real-time monitoring and data analysis
Composition of Condition Monitoring System for Wind Turbines

Diagram:Composition of Condition Monitoring System for Wind Turbines

News Links

Event
NTN Exhibits at the “6th International Wind Energy Expo & Conference WIND EXPO 2018” at World Smart Energy Week 2018 (February 16, 2018)
Press Release
NTN Donates Two Units of “NTN Hybrid Street Lights” to Iwata City, Shizuoka Prefecture (February 9, 2018)
Press Release
NTN Donates Three Units of “NTN Hybrid Street Lights” to Ishikawa Prefecture (January 24, 2018)
Event
NTN Exhibits at the “2017 BOSAI Industry Fair in Sendai” (November 20, 2017)
Event
NTN Exhibits at the Beijing International Wind Power Exhibition “China Wind Power 2017” (October 5, 2017)
Press Release
NTN Donates Five Units of “NTN Hybrid Street Lights” to Kuwana City, Mie Prefecture (September 8, 2017)
New Products
Development of “Asymmetrical Spherical Roller Bearings” for Wind Turbine Main Shafts (September 4, 2017)
Press Release
NTN Donates “NTN Hybrid Street Lights” as Company's 100th Anniversary Activity (August 16, 2017)
Event
NTN Exhibits at the “2017 BOSAI Industry Fair in Tokyo” (May 29, 2017)
Event
NTN-SNR Exhibits at the International Industrial Tradeshow “Hannover Messe 2017” (April 7, 2017)
Event
NTN Exhibits at the “5th International Wind Energy Expo & Conference WIND EXPO 2017” (February 14, 2017)
Event
NTN Exhibits at the Beijing International Wind Power Exhibition “China Wind Power 2016” (October 13, 2016)
Event
NTN-SNR Exhibits at the International Wind Energy Trade Fair “WindEnergy Hamburg 2016” (September 26, 2016)
Event
NTN Exhibits at China International Bearing Industry Exhibition “Bearing 2016” (September 20, 2016)
New Products
NTN Launches Extremely Silent Hybrid Street Lights (August 19, 2016)
Press Release
Junior Summit Participants Visit “Green Power Park” Natural Energy Circulation Model (May 2, 2016)
Press Release
NTN has established “Green Power Park” an energy circulation model of natural energy (April 12, 2016)
Event
NTN Exhibits at “4th International Wind Energy Expo & Conference WIND EXPO 2016” (February 25, 2016)