Abstract:
The present invention relates to a rope-driven transmission for a wind turbine. The transmission comprises an input rotary member for being operatively connected to a rotor of a wind turbine and in rotational connection with at least one secondary shaft which is arranged in parallel with the rotational axis of said input rotary member, wherein said secondary shaft is adapted for operative connection with an output member of at least one electrical generator, wherein said rotational connection between said input rotary member and said at least one secondary shaft is provided by a rope, the course of said rope defining a rope path, and wherein said rope path includes a plurality of turns around said input rotary member and said secondary shaft. The transmission facilitates an easy monitoring and maintenance of the transmission. The invention further relates to a method of maintaining the transmission by replacing the rope. The invention further relates to a wind turbine generator comprising the transmission.
Abstract:
A blade bearing for mounting a blade of a wind turbine to a hub of the wind turbine comprises first and second bearing rings arranged next to each other and a seal arrangement covering a space between the first and second bearing rings. One of the first or second bearing rings is configured to mount to the blade, and the other is configured to mount to the hub. The first and second bearing rings each have an axially-facing surface and a radially-facing surface. The seal arrangement includes a first seal element statically coupled to the axially-facing surface of the first bearing ring, a second seal element statically coupled to the axially-facing surface of the second bearing ring, and a holding member secured to the axially-facing surface of the first bearing ring. The first seal element is statically coupled to the holding member. The second seal element is dynamically coupled to the holding member and/or the first seal element.
Abstract:
The invention provides a bearing for attaching a wind turbine blade to a wind turbine hub, the bearing comprising a stationary ring, a movable ring which can rotate relative to the stationary ring, a grease lubrication structure, and a canister for collecting grease. The grease lubrication structure forms an outlet for releasing grease from a space between the stationary ring and the movable ring and the canister comprises an inner space with at least one inlet in releasable fluid communication with the outlet. The outlet and the inlet comprise cooperating coupling elements adapted for releasable snap-connection of the outlet to the inlet. Due to the snap-connection, the canister is easily removed and replaced in connection with maintenance of the wind turbine even though the space in the hub is typically very limited.
Abstract:
A wind turbine is described which comprises a tower, a nacelle mounted to the top of the tower, and a rotor mounted to the nacelle. The rotor comprises two or more blades mounted to a central hub. The hub supports two or more annular pitch bearings associated respectively with the two or more blades. Each pitch bearing defines a bearing plane inclined at a first angle with respect to a horizontal plane when the respective blade is oriented in a downwardly direction in alignment with the tower. Each pitch bearing is spanned by a hub plate; and a work platform integral with or mounted to the hub plate lies generally in a plane at a second angle to the horizontal plane when the respective blade is oriented in a downwardly direction in alignment with the tower, which second angle is less than the first angle. The work platform provides a substantially horizontal platform for use by maintenance personnel when installing or servicing components in and around the hub.
Abstract:
A blade bearing for mounting a blade of a wind turbine to a hub of the wind turbine comprises inner and outer rings arranged next to each other. One of the inner and outer rings is configured to mount to the blade, and the other is configured to mount to the hub. At least two rows of rolling elements are positioned between the inner and outer rings. Upper and lower rows of the rolling elements are located in respective upper and lower planes. A support structure is secured to the inner ring and extends in a substantially radial direction between the upper and lower planes. The support structure has non-uniform stiffness characteristics in a circumferential direction. A method of manufacturing a blade bearing is also provided.
Abstract:
The invention provides a wind turbine comprising a nacelle, a rotor comprising at least one blade attached to a hub, and an electrical supply structure for supplying electrical power from the nacelle to the rotor. The rotor is rotatably connected to the nacelle about an axis of rotation. The supply structure comprises a switch which has a connected mode in which the nacelle and the rotor are electrically connected, and a disconnected mode in which the nacelle and the rotor are electrically disconnected. Furthermore, the switch is adapted to change from the disconnected mode to the connected mode when the rotor does not rotate.
Abstract:
A lubrication pinion (10) for applying lubricant to a gear in a wind turbine comprises a support (12) defining a socket (18) having an opening, a shaft (14) coupled to the support (12) next to the socket (18), a pinion wheel (16) mounted on the shaft (14), and a joint member (20) having a ball portion (70) at least partially captured in the socket (18) and a shaft portion (72) extending through the opening to the socket. The support (12) can rotate about the shaft portion (72) of the joint member (20) and pivot about the ball portion (70) to be moved into one or more locked positions. A method of lubricating and service a gear with the lubrication is also disclosed where the service is performed while the support is maintained in one of the locked positions.
Abstract:
The application describes an apparatus for and a method of mounting wind turbine blades on a wind turbine tower. A number of guide rods 94 are provided in the vicinity of the blade root and hub for connection to corresponding socket sections 96. The guide rods 94 and socket sections 96 are provided on respective ones of a wind turbine blade and a wind turbine hub to facilitate connection of one to the other. The guide rods 94 and the sockets 96 may be provide on the same or on different ones of the blade or hub. The guide rods and sockets allow the blade to be positioned at the hub in the correct rotational orientation to facilitate connection of the necessary fasteners.
Abstract:
A rotor-blade discharge unit enabling electric charges to be discharged from a rotor blade of a wind turbine, the rotor blade discharge unit comprising at least one current transfer arrangement, the current transfer arrangement comprising: a roller device, an electrically conductive slideway, and a spark gap, wherein the roller device is biased towards the conductive slideway and is movable relative to the conductive slideway, the roller device comprising: at least one contact wheel, having a rolling surface and the contact wheel is arranged to roll on the conductive slideway and is biased towards the conductive slideway, wherein the rolling surface is arranged to deform against the conductive slideway under the bias acting on the roller device, wherein the contact wheel and the conductive slideway form a first current path to discharge the electric charges and wherein the spark gap forms a second current path upon occurrence of a spark bridging the spark gap, wherein the second current path is connected in parallel to said first current path.
Abstract:
A wind turbine (1) comprising a nacelle, a hub (4), a rotating shaft (14) arranged to be connected to a generator (12) in order to transfer rotational movement to the generator (12), and a gear arrangement (7). The gear arrangement (7) comprises a number of pulleys (8, 9, 11) and a number of belts (15, 16) interconnecting the pulleys (8, 9, 11) in order to transfer rotational movements between the pulleys (8, 9, 11), thereby transferring rotational movements from the hub (4) to the rotating shaft (14). The hub (4) is arranged between the gear arrangement (7) and the nacelle in order to allow easy replacement of the belts (15, 16) of the gear arrangement (7).