Abstract:
The invention relates to a direct driven wind turbine with a plain bearing and a service method for this bearing. A rotor of the wind turbine is directly connected with a rotatable drive train of the wind turbine. The rotatable drive train is directly connected with a rotor (5) of an electrical generator (1) of the wind turbine. The rotatable drive train is connected with a stationary part of the wind turbine via at least one bearing (2), which allows the rotation of the drive train in relation to the stationary part. The electrical generator (1) provides a support structure (8) to which the stationary side (7) of the at least one bearing (2) is mounted. The at least one bearing (2) is a plain bearing and the plain bearing (2) comprises a wear-and-tear-part, which is an object to be exchanged. The rotatable drive train is prepared to be fastened to the stationary part of the wind turbine and at least one wear- and-tear-part of the plain bearing (2) is exchangeable while the rotatable drive train is fastened to the stationary part.
Abstract:
The invention relates to a direct driven wind turbine with a plain bearing and a service method for this bearing. A rotor of the wind turbine is directly connected with a rotatable drive train of the wind turbine. The rotatable drive train is directly connected with a rotor 5 of an electrical generator 1 of the wind turbine. The rotatable drive train is connected with a stationary part of the wind turbine via at least one bearing 2, which allows the rotation of the drive train in relation to the stationary part. The electrical generator 1 provides a support structure 8 to which the stationary side 7 of the at least one bearing 2 is mounted. The at least one bearing 2 is a plain bearing and the plain bearing 2 comprises a wear-and-tear-part, which is an object to be exchanged. The rotatable drive train is prepared to be fastened to the stationary part of the wind turbine and at least one wear-and-tear-part of the plain bearing 2 is exchangeable while the rotatable drive train is fastened to the stationary part.
Abstract:
A lubrication system for a gear system for a wind turbine is disclosed. The lubrication system comprises a reservoir adapted to contain lubricant, first pump means arranged to supply lubricant from the reservoir to the gear system via a first fluid connection, and vacuum generating means arranged in fluid connection with the reservoir, thereby maintaining a total air pressure in the reservoir which is lower than an ambient pressure during normal operation. The lowered total air pressure in the reservoir draws lubricant from the gear system into the reservoir, thereby increasing the lubricant level in the reservoir and decreasing the lubricant level in the gear system, allowing the lubrication system to be operated in a 'dry sump mode'. In the case of an emergency or during start-up the vacuum generating means is stopped, thereby increasing the total air pressure in the reservoir. This causes a decrease in the lubricant level in the reservoir and an increase in the lubricant level in the gear system, allowing the lubrication system to be operated in a 'wet sump mode'.
Abstract:
The invention relates to a wind turbine (1) comprising a rotor (4) including at least one wind turbine blade (5) connected to a rotor hub (7) through at least one blade pitch bearing (9). The at least one pitch bearing (9) comprises at least one outer ring (24), at least one centre ring (25) and at least one inner ring (26), and the pitch bearing (9) further comprises a first rolling element arrangement (11) arranged between the at least one outer ring (24) and the at least one centre ring (25) and a second rolling element arrangement (12) arranged between the at least one centre ring (25) and the at least one inner ring (26), wherein at least one of the first and the second rolling element arrangements (11, 12) comprises at least two rows of rolling elements (13). The at least two rows of rolling elements (13) are arranged at different axial positions in relation to an axis of rotation of the pitch bearing (10), so that a first row (21) of the at least two rows of rolling elements (13) is arranged closer to the wind turbine part, to which the inner ring (26) and the outer ring (24) are connected, and a second row (22) of the at least two rows of rolling elements (13) is arranged closer to the wind turbine part to which the centre ring (25) is connected, wherein the play (8) of the rolling elements (13) in the first row (21) of rolling elements (13) is greater than the play (8) of the rolling elements (13) in the second row of rolling elements (13). The invention further relates to a pitch beating (9) for a wind turbine (1).
Abstract:
A gearbox (18) for a wind turbine has a bearing arrangement (34) positioned on the downwind side of a first stage planet carrier (26) at a single locus. The planet carrier (26) has a portion (27) extending radially inwards and axially downwind from the planet gears. This reduces the diameter, weight and cost of the bearing arrangement. The diameter, for example, can be less than the outer diameter of the input shaft. In addition, bearings positioned on the upwind side of the first stage planet carrier (26) are not required. Thus, the weight of the gearbox (18) is supported between the two theoretical support points of the pair of back to back tapered roller bearings (34) at the down wind side of the first stage planet carrier (26). The support for the gearbox is more stable compared to the traditional arrangement with face to face bearings in which the weight of the gearbox lies on the extended line of the two theoretical support points. The absence of upwind bearings for the first stage planet carrier (26) means that the front cover (1108) is not subject to external forces. Therefore a horizontal-split thin cover can be used on the upwind side of the first stage ring gear (28). This arrangement can reduce the weight of the housing by about one ton compared to the traditional housing for the upwind bearings. A member of unitary construction comprising gearbox flange (1240), input shaft (24) and first stage planet carrier (26), which can be cast as one piece, reduces the weight of this part compared to previous designs having separate components. In addition the machining required of the connector and coupling is reduced, and difficulties aligning individual components are eliminated. The dimension of the output side of the first stage planet carrier (26) is increased so that the stress level on this component is reduced. Therefore low cost cast iron can be used.
Abstract:
The invention relates to a wind turbine (100) with a nacelle (4), with a generator (12) arranged in the nacelle (4), with a tower (2) and with an azimuth bearing (24) for the adjustment of the nacelle (4) in terms of its orientation relative to the wind, wherein the azimuth bearing is arranged below the nacelle (4) by a vertical azimuth distance (26), and the nacelle (4) is supported on the azimuth bearing via a vertical shaft section (20) with a length corresponding to the azimuth distance (26).