FV produces well-engineered mechanical systems for rotor blade adjustment. Electric pitch systems are based on one or more mechanical gear units with electric motor, which drive a geared large diameter slewing bearing.
Hydraulic pitch systems are based on one or more hydraulic cylinders and a slewing ring bearing without gears to adjust the rotor blade position. In either case, the precise positioning of the rotor blades results in maximum energy yield.
Three-row roller bearings for higher load capacity and more cost efficiency
Wind turbines are growing steadily in an effort to attain higher energy yields. The options of adapting existing designs to the growing dimensions and more demanding load profiles has however limits - particularly in regard to rotor blade bearings. Therefore, in addition to the current single-row and double-row four-point bearings, FV now also offers three-row roller bearings for pitch systems. This highly increases the potential in terms of dimensioning and load capacity.
Medium and large pitch bearings are usually of double volleyball design. Also called 8-point contact ball slewing bearing. The load capacity of double ball pitch bearing is 80% higher than that of single volleyball turntable bearing.
The surface of pitch bearing has zinc coating and epoxy resin coating, long life seal and special sealing lip design. The bearing can be used safely and reliably for more than 20 years.