2011 WIND INDUSTRY in gERMany - Wind-Energy-Market

[04]High efficiency withreduced operating noiseIn addition, the Cyclo principle leads tohigh performance, compact and easy tomount drive configurations that featurehigh drive transmission ratios. The transmissionratios of single-stage drives rangebetween 6:1 and 119:1, while three-stagedrives can even achieve drive transmissionratios greater than 1,000,000:1.The rolling action enables the torque to betransferred with minimum friction. Comparedto traditional spur gear units, thisreduces not only the thermal loading andthe operating noise but also providesgreater efficiency – even with high transmissionratios. The overall efficiency ofsingle-stage drives is around 95 per cent.Pitch drive solutionsLow-maintenance and compact pitch drivesin the wind turbine’s nacelle set the precisepitch angle for the rotor blades. Aligningthe blades using precise, highly robustSumitomo drives ensures that optimal efficiencyis achieved even with low windspeeds and prevents damage to the windturbines even with high wind speeds.Yaw drives for the azimuth systemTo enable the nacelle to track the windhorizontally, Sumitomo Cyclo Drive alsooffers proven azimuth drive solutions withcompact drives for the high transmissionratios required here.Advantages of pitch and azimuth drivesFor both applications, the excellent efficiency,high durability and consequentlylong service life are particularly advantageous.[01] Pitch drive in the hub[01] Production facilities in Markt Indersdorf[02] Assembly and productionto the latest standards[03] Wind farm in southern Germany[04] Cyclo Drive 6000 –a basic azimuth drive systemInnovative drive solutionsfor wind turbinesThe decisive factors determining the efficiencyand durability of wind turbines arethe pitch and azimuth drives, which can beparticularly efficiently implemented withSumitomo Cyclo drives.[05]Wind industry in germany105