AU2014323747A1

AU2014323747A1 - Rotor blade for a wind turbine, rotor hub, drive train, nacelle, wind turbine and wind turbine farm

Info

Publication number: AU2014323747A1
Application number: AU2014323747A
Authority: AU
Inventors: Rolf Rohden
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-09-20
Filing date: 2014-09-19
Publication date: 2016-03-17
Anticipated expiration: 2034-09-19
Also published as: EP3047141A1; WO2015039650A1; DE112014004330A5; DE202013104310U1; EP3047141B1

Abstract

The invention relates to a rotor blade for a wind turbine, the rotor blade having a rotor blade-side pitch pin receptacle and, in an installed state, a pitch pin of a rotor hub being mounted in the rotor blade-side pitch pin receptacle by means of a bearing so that a secure connection between the rotor blade and the rotor hub is created by the bearing in order to transmit force acting on the rotor blade to a generator following the rotor hub for conversion into electric energy. The invention also relates to a rotor hub, a drive train, a nacelle and to a wind turbine and a wind turbine farm.

Description

Rotor blade for a wind turbine, rotor hub, drive train, nacelle, wind turbine and wind farm [01] The invention relates to a rotor blade for a wind turbine, a rotor hub, a drive train, a nacelle, as well as a wind turbine and a farm of wind turbines or a wind farm. [02] The usual situation is for a rotor blade to be connected to the rotor hub of a wind turbine or wind power station by a detachable, secure connection, for example by means of bolts or adhesive materials. But transition problems can arise when different materials have to be joined. This is a common problem since the rotor blades are usually manufactured from glass-fibre or carbon-fibre reinforced plastic, while the rotor hubs are made of metal. [03] For optimal exploitation of the wind, a rotor blade can be turned (pitched) relative to the rotor hub. The components which adjust the blade are in particular housed in the rotor hub. To this end, large electric or hydraulic actuating drives are used which generally use a motor-driven gear connection (hereinafter called gearbox) to provide the rotor blade with a pitch angle. These types of drives are complex, and the fact that rotor blade and rotor hub are made of different materials causes difficulties here as well. [04] DE 733 566 discloses a covered windmill sail which can be turned and which has a rod firmly clamped to a hub body. The rod contains an internal adjustment tube to adjust the sail. At the sail tip, the head of the adjustment tube has a joint to facilitate the turning of the sail. This embodiment is not suitable for modern rotor blades. 1 [05] In DE 28 25 061 C2, the blades are suspended in a hub so they can rotate with the aid of a ball-bearing, said hub also containing the hydraulic power adjustment system. [06] DE 100 11 464 Cl describes a positioning drive pivot bearing which is securely bolted between hub stub and rotor blade. Conventionally, the pitch angle of the rotor blade is set by an electric motor, which is mounted together with the gearbox on a mount which is securely connected to the hub stub. [07] AT 384 657 B discloses a blade adjustment device which is operated mechanically by means of flyweights in the hub, said hub being connected with the adjustment gearbox in the blade via a system of levers. [08] The objective of the invention is to improve the Prior Art. [09] The objective is achieved with a rotor blade for a wind turbine where the rotor blade has a pitch-pin receptacle on the rotor blade itself and, in a mounted state, a pitch-pin of a rotor hub is mounted in the pitch-pin receptacle by means of a bearing so that the bearing forms a secure connection between the rotor blade and the rotor hub, in order to transfer a force acting on the rotor blade to a generator downstream of the rotor hub to convert the force into electrical energy. [10] The proposed solution means that the rotor blade and the rotor hub can be manufactured from different materials without this leading to transition problems between the materials. The production is thus more flexible and can be carried out at a lower cost. 2 [11] This makes it possible to also manufacture wind turbine components from materials not hitherto used, for example to manufacture the rotor blades from metal. [12] In addition, electrical components can be located mainly in the rotor hub and the passive components can be positioned on the rotor blade side. [13] The following terminology is explained here. [14] A "rotor blade" comprises in particular the blade of a wind turbine. The rotor blade transfers the force acting upon the rotor blade, in particular the force of the wind, to the rotor hub in the form of kinetic energy. The rotor blade is in particular a blade which can be pitched so that a turn can be imparted to the blade. This adjusts the rotor blade to the wind conditions, the energy yield and/or the rotational speed of the generator. [15] As is usual with modern rotor blades, the rotor blade can contain glass-fibre reinforced plastic. For long rotor blades and/or high loads, the rotor blade can also contain carbon fibres. Maximum blade lengths can currently be around 65 to 85 m, although longer and shorter rotor blades can also be realised. The rotor blade can be equipped with lightning conductors to prevent lightning damage. [16] The "rotor hub" is in particular the rotor hub of a wind turbine, on which the individual rotor blades are mounted. Several rotor blades, in particular three rotor blades, can be mounted on a rotor hub. The rotor hub under consideration is in particular the first component of a mechanical drive train. The rotor hub transfers the kinetic energy from the rotor blades to the generator. Particularly when the drive train has a gearbox, the rotor hub is connected to the rotating rotor shaft of the gearbox, whereby the rotational speed of the rotor hub is converted into a higher rotational speed. With a 3 gearless drive train, the rotor hub particularly transfers the energy directly to the generator, which can in particular have the form of a so-called ring generator. The rotor hub can usually consist of metals, especially cast steel or special nodular cast iron, or, as is usual in older installations, from steel plate or forged parts. [17] The "pitch-pin" is in particular a cylindrical connecting element between rotor blade and rotor hub. The pitch-pin is in particular arranged about a pitch axis. The pitch-pin can form one piece with the rotor hub or be connected to it so that forces can be imparted or drawn away with optimum effect. The diameter and the length of the pitch-pin are thus designed to bear the actual blade of the rotor blade even at high wind loads. The pitch-pin can also be designed so as to be connected with the rotor blade and/or the pitch-pin receptacle of the rotor blade on the rotor blade itself. [18] The "pitch-pin receptacle on the rotor blade itself" is in particular a space in the rotor blade into which the pitch-pin can be inserted and fastened. The pitch-pin is in particular mounted in bearings in the pitch-pin receptacle of the rotor blade itself. One or more bearings can be fixed to the pitch pin receptacle in the rotor blade itself. The pitch-pin receptacle in the rotor blade can in particular have further components, such as a pitch drive. [19] A "bearing" is in particular deemed to be an element to guide components which move with respect to each other. In the present patent application, the bearing shall also fulfil a clamping function which allows rotation yet prevents or reduces undesired movements. In the optimum case, the bearing takes up simultaneously acting radial and axial loads. Angular contact bearings in particular can be used for the bearings. [20] A "generator" has in particular the task of converting a mechanical rotation into electric power. 3-phase asynchronous 4 or synchronous generators in particular can be used for this purpose. [21] A "mounted state" is in particular deemed to be the state after the installation of the pitch-pin for the secure connection to the rotor blade and/or the rotor hub. The "mounted state" is preferably the operational assembly of the rotor blade, the pitch-pin and the rotor hub in a secure connection. This does not mean that the whole wind turbine must be in an operational state in order for this embodiment to be realised, however. [22] An essential substance of the invention is based on the fact that, in contrast to the Prior Art stated, the secure connection between the rotor blade and the rotor hub is essentially brought about by one or more bearings. There is therefore no need for a bolted or adhesive joint between rotor blade and rotor hub. This secure connection thus has no flanges, rivets, bolts or other hitherto usual means of connection. [23] Neither are there any transition problems between different materials, which are otherwise usual between the rotor blade and the rotor hub, since the bearing can be designed according to the requirements of the pitch-pin, on the one hand, and according to the requirements of the pitch pin receptacle on the rotor blade, on the other. This provides an easier and functionally stable way of using different materials to manufacture the rotor blade and the rotor hub without being limited by the connection. [24] While the usual way of connecting the parts means a fracture can occur at high loads in particular at the adhesive joint of two different materials, no material failure can occur with the secure connection formed by having bearings between the different materials because the forces are absorbed by the bearing. 5 [25] In a further embodiment, the rotor blade has a bearing, in particular an angular contact bearing, so that in the mounted state, the bearing provides the secure connection between the rotor blade and the rotor hub. [26] "Angular contact bearing" is deemed to be in particular a bearing which can absorb forces whose lines of action do not run exactly perpendicular to the axis, but meet the axis at a specific, oblique angle. The angular contact bearing can realise a clamping function and allows the rotor blade to rotate relative to the pitch-pin. [27] It is advantageous to use an angular contact bearing since it also absorbs forces which impinge at an oblique angle to the axis of rotation. This ensures the connection between rotor blade and rotor hub is secure. The forces acting can thus be optimally transferred from the rotor hub to the rotor shaft as a rotary motion or directly via the rotor hub to the generator. [28] In order to achieve optimum force transfer to the rotor hub by means of a bearing connection between rotor blade and pitch-pin, the pitch-pin can be on the rotor blade such that, in the mounted state, the rotor blade and the rotor hub are securely connected by means of the pitch-pin. [29] The pitch-pin receptacle on the rotor blade and the pitch pin can be comprised of different materials. [30] It is thus possible to select different materials for the pitch-pin receptacle on the rotor blade and the pitch-pin which are optimal for the function and the load. This also means that, for the first time, it is practicable to use an operational rotor blade with a metal skin. [31] The pitch-pin receptacle on the rotor blade can be produced from sheet metal and bonded securely into the rotor 6 blade, for example. This provides a very stable mounting for the bearings, for example. On the other hand, the pitch-pin can be manufactured from the same material as the rotor hub, for example cast steel. [32] A special embodiment of the invention is the fact that the rotor blade is made mainly from metal and/or a metal alloy. [33] "Mainly" here means in particular that the proportion of metal and/or metal alloy is at least 50% of all the materials in the skin of the rotor blade. [34] As was described in the introduction, rotor blades are usually manufactured from fibre-reinforced plastic, whereby different layers have to be added in a complex process. [35] This patent application discloses for the first time a rotor blade which can be used for wind turbines and is made mainly of metal, in particular for rotor blades over 30 m in length. [36] It is advantageous if the metal and/or the alloy can be pressed. The formable, lightweight metal aluminium can be used for rotor blade production, for example. It is also possible to use steel sheets whose properties can be modified by the alloying components. The alloy can make the sheet steel more pliable, for example. [37] It particularly becomes possible to manufacture the rotor blade from metal and/or metal alloy because the pitch-pin in the pitch-pin receptacle of the rotor blade on the rotor blade itself is securely connected by bearings. This means there are no transition problems between different materials and the material of the rotor blade can be chosen to suit. [38] The pitch-pin receptacle can also consist mainly of metal and or metal alloys. 7 [39] "Mainly" here is taken to mean in particular that the proportion of metal and/or metal alloy is at least 50% of all the materials of the pitch-pin receptacle on the rotor blade. [40] In addition to the advantages already described above, this allows the rotor blade and the pitch-pin receptacle on the rotor blade to be manufactured from the same metal and/or the same metal alloy. [41] No transition problems occur between the materials because the rotor blade and the pitch-pin receptacle on the rotor blade are manufactured from the same metals and/or metal alloys or from metals and/or metal alloys which are compatible with each other, and a secure connection exists between the pitch-pin receptacle on the rotor blade and the rotor blade. The rotor blade and the pitch-pin receptacle on the rotor blade can thus easily be produced as a single unit or so they can be securely connected. [42] In particular, since the rotor blade is designed so as not to have a current-carrying component, in particular no controlling and/or regulating and/or power-supplying component, it is possible for the rotor blade and the connection to the rotor hub to have a simpler design and embodiment. [43] As mentioned above, rotor blades are equipped with lightning conductors, whose task is to conduct away the current of a lightning flash without damaging the wind turbine. There is a clear difference between a lightning conductor and the controlling and/or regulating and/ or power supplying function of a current-carrying component under consideration so that it can be provided in this embodiment nevertheless. [44] This current-carrying component has a concrete controlling, regulating or power-supplying function within the 8 wind turbine which is used for a specific purpose. This can be a pitch drive, for example, or to supply sensors. [45] Since these current-carrying components are not installed in the rotor blade, there are no cables which can become twisted. In addition, no cables have to be fed through the rotor hub to the rotor blade. [46] A pitchable rotor blade which has no current-carrying components can be advantageously realised by an electromagnetic pitch drive. [47] As described above, the pitch drive makes it possible to track the wind direction and turn the rotor blades. [48] "Electromagnetic" means in particular that a current carrying conductor, in particular a coil, generates a magnetic field in its vicinity. [49] Thus neither an electrical pitch drive as described in the introduction nor a hydraulic pitch drive is required, said pitch drive transferring a mechanical force from the rotor hub to the rotor blade or vice versa. [50] In consequence, the pitch drive can have a simpler form and in particular have no direct cable connection or direct mechanical force transmission between rotor hub and rotor blade. [51] One embodiment for this is that the pitch drive has the form of a coil and a permanent magnet assigned to the coil, where in particular the permanent magnet is arranged on the rotor blade side and the coil on the rotor hub side. [52] A "coil" consists in particular of several windings connected in series. A current-carrying coil creates a magnetic field and is thus an electromagnet. 9 [53] A "permanent magnet" is in particular a magnet made of a piece of a hard magnetic material, for example alloys of iron, cobalt, nickel or certain ferrites. A permanent magnet has and maintains a static magnetic field without requiring an additional flow of electric current, as is required by an electromagnet. [54] One permanent magnet or preferably several permanent magnets can be arranged in the blade of the rotor blade and/or in or on the pitch-pin receptacle on the rotor blade. One or more coils are assigned in particular to the pitch-pin and can wind around the pitch-pin. The blade of the rotor blade can be made to turn by feeding current to the coils and as a result of the magnetic field which is thus produced. [55] It is particularly favourable that there are no current carrying components in the rotor blade in this case and no cables have to be routed, and that the blade contains only passive components. [56] And conversely, the coils which the drive coils of the pitch drive supply with a voltage, for example, can obviously be arranged in the blade. Data transmission is also possible. [57] Furthermore, the proposed solutions allow the pitch-pin receptacle on the rotor blade to have a geared-motor drive or two or more geared-motor drives at the end, and the pitch-pin to have corresponding gearbox receptacles. [58] The arrangement of one or more geared-motor drives in the pitch-pin receptacle on the rotor blade makes it possible to realise a design which takes up less space than the Prior Art, where the pitch motors are arranged in the rotor. [59] Furthermore, the objective will be achieved by a rotor hub, where the rotor hub has a pitch-pin receptacle on the hub so that a rotor blade as described can be connected. 10 [60] The "pitch-pin receptacle on the rotor hub" is in particular a space in the rotor hub in which the pitch-pin, which is in particular arranged around a pitch axis, can be inserted and fastened. The pitch-pin is mounted in bearings in the pitch-pin receptacle on the hub or is connected to it. One or more bearings can be fixed to the pitch-pin receptacle on the hub. [61] Particularly favourable is the embodiment of the rotor hub with a pitch-pin so that a rotor blade as described can be connected. [62] This makes it possible to manufacture the rotor hub and the pitch-pin in one piece from the same material. [63] In a further embodiment, the rotor hub has an angular contact bearing so that, in the mounted state, the secure connection between the rotor hub and the rotor blade is provided by the angular contact bearing. [64] One or more angular contact bearings between rotor hub and rotor blade ensure the connection is secure. The forces acting can thus be optimally transferred to the rotor hub. [65] Likewise, several angular contact bearings can be arranged, where these can be arranged on the pitch-pin receptacle of the rotor hub and/or on the pitch-pin receptacle of the rotor blade. [66] In order to guarantee a supply of electricity and the necessary functions, one electrical component or several electrical components, in particular at least one controlling and/or regulating and/or power-supplying component, is or are arranged in the rotor hub. [67] The design of the electrical component has already been described. It can be a coil or a pitch drive, for example. 11 [68] A simple cable routing can be realised in the rotor by arranging an electrical component in the rotor hub. The usual problem of cables twisting when the cables are routed from the rotor hub to the rotor blade does not occur here as long as the rotor blade is equipped only with passive components. A passive component is in particular deemed to be a component which is not connected by an electrical cable (such as a permanent magnet, for example). [69] In an additional aspect of the invention, the objective is achieved by a drive train with a rotor blade as described and/or a rotor hub as described, where the drive train has at least one gearbox and/or at least one generator. [70] A "gearbox" is in particular deemed to be a transmission gearbox to adjust the rotational speed. Increasing the rotational speed for the generator allows a rotor of the generator to rotate more quickly and the generator can be designed in particular with a smaller diameter. The wind turbine can also be designed without a gearbox when a generator is used which can operate at low speed. [71] The force acting on the rotor blade can thus be converted into electrical power via the drive train. [72] According to a further development of the invention, the objective is achieved by a nacelle for a wind turbine with a rotor blade as described and/or a rotor hub as described and/or a drive train as described. [73] In particular, the drive train, the electrical equipment, the rotor head bearing and the auxiliary equipment such as cooling systems, fire detectors and fire extinguishing systems and similar are installed in the "machine room", also called the nacelle. The nacelle thus ensures the functionality of the wind turbine and protects the components from environmental influences such as rain, for example. 12 [74] The objective can also be achieved by a wind turbine with a rotor blade as described and/or a rotor hub as described and/or a drive train as described and/or a nacelle as described. [75] A "wind turbine", also called a wind power station, is deemed in particular to be an installation which converts the force of the wind acting on the rotor blades of the installation into electrical energy and feeds it into the electricity grid. [76] The secure connection by means of bearings between rotor blade and rotor hub thus enables the effective force of the wind to be transferred, converted into electrical energy, and fed into the electricity grid. [77] Moreover, the secure connection means the wind turbine can be designed with new materials and thus achieve longer service lives. [78] Furthermore, the invention can be realised by a wind turbine farm with a wind turbine as described. [79] A "wind farm" is in particular a spatial concentration of wind turbines. These can form an organisational unit (one investor or operator) and/or a technical unit (shared feeding in of the electrical power). In particular, so-called wind farm effects can be created where an initial installation has an effect on a down-wind installation. [80] By designing the wind farm with several wind turbines according to the invention, the simplified production brought about by the secure connection can be carried out several times and thus more productively. [81] In addition, less material failure and longer service lives make it possible to feed more of the electricity generated into the grid. 13 [82] Below, the invention is explained in more detail with the aid of example embodiments. Figure 1 shows a very schematic cross-section of a lateral view of part of a rotor blade with a pitch-pin receptacle on the rotor blade which is securely connected with the pitch-pin of a rotor hub, and an electromagnetic pitch drive, Figure 2 shows a very schematic cross-section of a lateral view of part of a rotor blade with a pitch-pin receptacle on the rotor blade, which is securely connected with a pitch-pin of the rotor hub, and an electric geared motor drive, and Figure 3 shows a very schematic cross-section of various alternative embodiments of the rotor blade with a pitch-pin receptacle on the rotor blade, angular contact bearings and pitch-pins, and the rotor hub with pitch-pin and angular contact bearings and pitch-pin receptacle on the hub. [83] A rotor blade 101 has a blade 102. A pitch-pin receptacle on the rotor blade is arranged in the rotor blade 101. Two angular contact bearings 113 and 115 are mounted on the pitch pin receptacle 107 on the rotor blade itself. The pitch-pin 105, which is directly connected with the rotor hub 103, is clamped into the angular contact bearings 113 and 115. A coil 123 is wound around the pitch-pin 105 on the free surface of the pitch-pin 105 which is not taken up by the angular contact bearings 113 and 115. Several permanent magnets 121 are mounted at the sides of the pitch-pin receptacle 107 on the rotor blade opposite the coil 123 (the cross-sectional view means only two permanent magnets are shown in Figure 1) . The 14 rotor blade 101 and the pitch-pin receptacle on the rotor blade 107 rotate about the axis of rotation 111, while the rotor hub 103 rotates about an axis of rotation of the drive train (not shown). [84] The blade 102 and the pitch-pin receptacle 107 are manufactured from aluminium. The rotor hub 103 and the pitch pin 105 are made as one piece and manufactured from cast steel. The angular contact bearings 113 and 115 are securely connected with the pitch-pin receptacle 107 on the rotor blade. The angular contact bearings 113 and 115 allow the pitch-pin receptacle 107 on the rotor blade to turn with the whole rotor blade 101 about the pitch-pin 105, thereby allowing it to pitch. [85] Furthermore, the effective force of the wind is transferred to the blade 102 of the rotor blade 101 and imparted as a rotary motion to the pitch-pin 105 and hence to the rotor hub 103, which transmits the rotation to a downstream generator (not shown) of a drive train (not shown). [86] Coil 123 (shown very schematically in Figure 1), which is arranged on the pitch-pin 105, can be supplied with current via a cable. For the electromagnetic pitch drive, feeding current analogously to the coil 123 induces a magnetic field which, in conjunction with the permanent magnets 121 in the pitch-pin receptacle on the rotor blade, imparts a rotation about the axis of rotation 111 to the blade 102. A pitch drive is thus realised in the interplay of coil 123 and the permanent magnets 121. [87] In a second alternative, two pitch motors 221 and two associated gearboxes 223 with corresponding gear wheels on the hub are arranged on the blade at the end towards the pitch-pin receptacle 207 on the rotor blade instead of the electromagnetic pitch drive (shown only very schematically in Figure 2). 15 [88] Since the pitch motor is driven electrically, the blade 202 also rotates about the axis of rotation 211 relative to the pitch-pin 205 and a corresponding angle of rotation can form. [89] The rotor blade 301 and the corresponding rotor hub 303 can be manufactured as different alternatives. [90] The rotor blade 301 has only the pitch-pin receptacle 307 on the rotor blade (Figure 3.a). In the next production level, the rotor blade additionally has the angular contact bearings 313, 315 (Figure 3.b). In the last alternative (Figure 3.c) of the rotor blade 301, the rotor blade 301 is already provided with the pitch-pin 305. [91] In each case, the rotor blade 301 has the blade 302 and, in the mounted state, turns about the axis of rotation 311. In all alternatives, the rotor blade 301 is securely connected with the pitch-pin receptacle 307 on the rotor blade by means of an adhesive joint (Figures 3.a,b,c). [92] In the not mounted state, two angular contact bearings 313 and 315 are securely connected to the pitch-pin receptacle 307 on the rotor blade (Figures 3.b,c) . In the mounted state (not shown), the angular contact bearings 313 and 315 additionally clamp the pitch-pin 305 of a rotor hub 303 (see Figure 3.d, e) and thus bear the rotor blade 301. [93] In an alternative of rotor blade 301, a pitch-pin 305, which is not yet connected with the rotor hub 303 in the not mounted state, is clamped in the angular contact bearings 313 and 315 (Figure 3.c) . In the mounted state (not shown), the pitch-pin 305 of rotor blade 301 is fixed in the pitch-pin receptacle 317 of the rotor hub 303 on the hub itself (see Figure 3.f). 16 [94] In an alternative of rotor hub 303, the pitch-pin 305 is securely connected directly with the rotor hub 303 and manufactured in one piece from the same material in one casting (Figures 3.d, e) . In the mounted state (not shown), the pitch-pin 305 (Fig. 3.e) is clamped in the pitch-pin receptacle 307 on the rotor blade side of the rotor blade 301 (see Figure 3.f) by the angular contact bearings 313 and 315 (see Fig. 3.b). [95] In a further production level of the rotor hub 303, the pitch-pin 305 of the rotor hub 303 has itself two angular contact bearings 313, 315 (Figure 3.d) . In the mounted state (not shown), the two angular contact bearings 313 and 315 of the pitch-pin 305 are securely connected in the pitch-pin receptacle 307 of the rotor blade on the rotor blade 301 (see Figure 3.a). [96] In a third alternative of the rotor hub 303, the rotor hub 303 has a pitch-pin receptacle 317 on the hub (Figure 3.f) in which the pitch-pin 305 of a rotor blade 301 (see Figure 3.c) is securely connected in the mounted state (not shown). [97] The alternatives of the rotor blade 301 and the rotor hub 303 mean the shell of rotor blade 301 can be manufactured from aluminium and connected to the rotor hub made of cast steel, where the pitch-pin 305, being arranged on the rotor blade 301 or the rotor hub 303, can be manufactured as desired depending on the load caused by the force acting upon the rotor blade 301. At high loads, the first or second alternative of the rotor hub 303, where the pitch-pin 305 and the rotor hub 303 are manufactured in one casting as one piece (Figures 3.d, e), will be used in particular. At low loads in particular, it is possible to have a pitch-pin receptacle 317 of the rotor hub 303 (Fig. 3.f) on the hub itself, in which the pitch-pin 305 of a rotor blade 301 (see Figure 3.c) is fixed in the mounted state. 17 [98] This furthermore ensures that optimum clamping of the pitch-pin 305 in the rotor blade 301 and on the rotor hub 303 is achieved by varying the number of angular contact bearings 313 and 315 and their positioning. 18 List of reference signs 101 Rotor blade 102 Blade 103 Rotor hub 105 Pitch-pin 107 Pitch-pin receptacle on the rotor blade 111 Axis of rotation 113 First angular contact bearing 115 Second angular contact bearing 121 Permanent magnets 123 Coil 201 Rotor blade 202 Blade 203 Rotor hub 205 Pitch-pin 207 Pitch-pin receptacle on the rotor blade 211 Axis of rotation 213 First angular contact bearing 215 Second angular contact bearing 221 Pitch motor 223 Gearbox 301 Rotor blade 302 Blade 303 Rotor hub 305 Pitch-pin 307 Pitch-pin receptacle on the rotor blade 311 Axis of rotation 313 First angular contact bearing 315 Second angular contact bearing 317 Pitch-pin receptacle on the hub 19

Claims

1. Rotor blade (101, 201, 301) for a wind turbine, wherein the rotor blade has a pitch-pin receptacle on the rotor blade (107, 207, 307) and, in a mounted state, a pitch pin (105, 205, 305) of a rotor hub (103, 203, 303) is mounted in the pitch-pin receptacle on the rotor blade by means of a bearing (113, 115, 213, 215, 313, 315) so that the bearing forms a secure connection between the rotor blade and the rotor hub, in order to transfer a force acting on the rotor blade to a generator downstream of the rotor hub to convert it into electrical energy.

2. The rotor blade according to Claim 1, wherein the rotor blade has a bearing, in particular an angular contact bearing (113, 115, 213, 215, 313, 315) so that, in the mounted state, the bearing provides the secure connection between the rotor blade and the rotor hub.

3. The rotor blade according to Claims 1 and 2, wherein the rotor blade has the pitch-pin so that, in the mounted state, the rotor blade and the rotor hub are securely connected via the pitch-pin.

4. The rotor blade according to one of the above Claims, wherein the pitch-pin receptacle on the rotor blade and the pitch-pin are made of different materials.

5. The rotor blade according to one of the above Claims, wherein the rotor blade is made mainly of metal and/or metal alloys.

6. The rotor blade according to one of the above Claims, wherein the pitch-pin receptacle on the rotor blade is made mainly of metal and/or metal alloys. 23

7. The rotor blade according to one of the above Claims, wherein the rotor blade is designed without a current carrying component, in particular without a controlling and/or regulating and/or power-supplying component.

8. The rotor blade according to one of the above Claims, wherein it has an electromagnetic pitch drive.

9. The rotor blade according to Claim 8, wherein the pitch drive has the form of a coil (123) and a permanent magnet (121) assigned to the coil, where in particular the permanent magnet is arranged on the rotor blade and the coil on the rotor hub.

10. The rotor blade according to one of the Claims 3 to 6 or 8 to 9, wherein the pitch-pin receptacle on the rotor blade has a geared-motor drive (221, 223) or two or more geared-motor drives at the end, and the pitch-pin has corresponding gearbox receptacles.

11.A rotor hub, wherein it has a pitch-pin receptacle on the hub (317) so that a rotor blade can be connected according to one of the Claims 3 to 10.

12. A rotor hub with a pitch-pin (305) so that a rotor blade can be connected according to one of the Claims 1 to 2 or 4 to 10.

13. The rotor hub according to Claim 11 or 12, wherein the rotor hub has an angular contact bearing (313) so that, when mounted, the secure connection between the rotor hub and the rotor blade is provided by the angular contact bearing.

14. The rotor hub according to one of the above Claims, wherein one electrical component or several electrical components, in particular at least one controlling and/or 24 regulating and/or power-supplying component, is or are arranged in the rotor hub.

15. Drive train with a rotor blade according to one of the Claims 1 to 10 and/or a rotor hub according to one of the Claims 11 to 14, wherein the drive train has at least one gearbox and/or at least one generator.

16. Nacelle for a wind turbine with a rotor blade according to one of the Claims 1 to 10 and/or a rotor hub according to one of the Claims 11 to 14, and/or a drive train according to Claim 15.

17. Wind turbine with a rotor blade according to one of the Claims 1 to 10 and/or a rotor hub according to one of the Claims 11 to 14 and/or a drive train according to Claim 15 and/or a nacelle according to Claim 16.

18. Wind farm with a wind turbine according to Claim 17. 25