Wind turbine

Abstract

Wind turbine (1), in particular a small wind turbine preferably for private use, comprising, - at least one wave (2), - at least one wing (3) which is directly or indirectly attached to the at least one shaft (2), wherein the at least one wing (3) is designed in a strip-like form and is preferably twisted and wraps around an axis of rotation of the shaft (2), wherein the at least one wing (3) is attached to the at least one shaft (2) at a first end (3.1) and a second end (3.2). wherein preferably the first end (3.1) and the second end (3.2) of the at least one wing (3) are spaced apart both axially and by an angle of rotation with respect to the axis of rotation of the shaft (2), - a generator (4) which is connected to the shaft (2) and is suitable for converting a rotation of the shaft (2) into, preferably electrical, energy, - a support (5) which is (directly and / or indirectly) connected to at least one shaft (2) and / or the generator (4), characterized by that the wind turbine has a wind vane (9) by which the wind turbine (1) automatically aligns itself with the wind.

Description

[0001] The invention relates to a wind turbine having the features of the independent main claim.

[0002] Wind turbines are well known and are used to generate electrical energy from wind power. DE 32 46 694 A1 describes a corresponding wind turbine with spoke-shaped blades on a shaft, which can generate electrical energy. It has been shown that optimal use of wind conditions is not always possible when operating such wind turbines. In particular, high rotation speeds of the wind turbine in strong winds cannot be optimally utilized. Furthermore, strong winds and high rotation speeds can lead to considerable noise pollution. Furthermore, it is possible that high rotational movements can lead to material failure, which can result in accidents and injuries.

[0003] It is also necessary to distinguish between very large wind turbines, which quickly reach a height of 50 m or significantly more and generate an output of up to 3 MW or even up to 10 MW, and smaller wind turbines, which rarely exceed a height of 25 m and achieve an output of up to 800 kW.

[0004] Due to their size, large wind turbines are always located on their own (without any objects in the vicinity of the rotor blades) to ensure optimal utilization of wind power. Smaller wind turbines, on the other hand, are also located in built-up areas, close to or on buildings and objects, and are sometimes used by private individuals or households to generate electricity. For this reason, smaller wind turbines must adapt to the built-up area and not cause disturbances in terms of noise, lighting effects, general hazards, visual design, etc. Therefore, different requirements are placed on the development and operation of small wind turbines than on large wind turbines.

[0005] It is therefore an object of the present invention to at least partially overcome at least one of the disadvantages described above. In particular, the object of the invention is to provide a small wind turbine that optimally utilizes wind conditions. Preferably, the invention can also at least reduce noise pollution and the risk of injury. Furthermore, the invention enables cost-effective production of such a small wind turbine.

[0006] To achieve this objective, a wind turbine (also referred to as a "plant" for short) with all the features of the main claim is proposed. Advantageous developments of the wind turbine are specified in the dependent device claims. Further features and details of the invention emerge from the dependent device claims, the description, and the drawings.

[0007] According to the invention, a wind turbine is provided, in particular a small wind turbine (for private use), comprising at least one shaft, at least one blade which is fastened directly or indirectly to the at least one shaft, wherein the at least one blade is designed in the shape of a strip (and preferably has an approximately rectangular (flat) cross-sectional shape) and is preferably twisted and wraps around an (imaginary) axis of rotation of the shaft. In this case, the at least one blade is fastened to the at least one shaft (directly or indirectly) with a first end and a second end, wherein the first end and the second end of the at least one blade are preferably spaced apart both axially and by an angle of rotation with respect to the axis of rotation of the at least one shaft.Furthermore, the wind turbine has a generator that is connected to the at least one shaft (directly or indirectly) and is suitable for converting a rotation of the at least one shaft into, preferably electrical, energy, and a holder that is connected (directly and / or indirectly) to the at least one shaft and / or the generator. Furthermore, it is provided that the wind turbine has a wind vane, by means of which the wind turbine automatically aligns itself to the wind. This means that the wind vane is designed such that it optimally aligns at least the blade with the holder to the wind (meaning the current wind direction). This alignment can occur automatically by the wind itself, so that no additional drive is necessary for alignment. For this purpose, the wind vane can be designed to be flat with a (larger) vane surface in order to provide an appropriate surface area for the wind to act on.In particular, the wind vane can be leaf- and / or board-shaped, with the vane surface being round, elliptical, triangular, trapezoidal, or rectangular. Other vane surfaces are also conceivable, for example, to achieve an attractive design for the entire wind turbine.

[0008] The at least one (strip-shaped) blade has two ends, with which it is attached to the shaft. Consequently, the existing blades do not extend from the shaft in a spoke-like manner with only one end, as is the case with large wind turbines, and they also do not have an open end. The shaft can be designed as a single piece or in multiple pieces, in particular in two pieces. Preferably, the shaft is arranged on the support, in particular via at least one (or more, preferably two) bearings, so that the shaft can rotate at least partially or completely (driven by the at least one blade).

[0009] In the case of a one-piece (meaning a continuous) shaft (see Fig. 1) This can be clamped between the brackets (e.g., via the bearings) and accommodates the existing vanes attached to the shaft. The one-piece shaft, in particular, is capable of absorbing high (mechanical) forces from the vanes (attached to the ends) and transferring them to the generator for energy production.

[0010] The two-part shaft is also similar to the one-part shaft and has an identical imaginary axis of rotation to the one-part shaft. The two-part shaft can also be clamped between the bracket with its two shaft stubs and accommodate the existing vanes. Here, too, at least one shaft stub (of the two-part shaft) can be mounted rotatably relative to the bracket via a bearing (see Fig. Fig. 2).

[0011] The previously mentioned bearing for the shaft or a shaft stub can include a rolling and / or ball bearing in order to minimize friction during the rotational movement as much as possible.

[0012] Ideally, a rotary motion of the shaft or a shaft stub is transmitted to at least one generator to generate, preferably electrical energy, from this rotary motion. It is also conceivable for a generator to be arranged at each shaft end or shaft stub.

[0013] At least one gearbox can also be provided between the shaft or a shaft stub and the generator to adjust the speed and torque in order to optimize energy generation.

[0014] Furthermore, the at least approximately rectangular (in cross-section), preferably twisted shape of the wing, which wraps around the imaginary (or real) axis of rotation of the shaft, can also be understood in such a way that the wing has a flat strip shape and / or band shape and / or extends along the axis of rotation of the at least one shaft and / or in an arc radially to the axis of rotation of the at least one shaft.

[0015] To achieve a flow-optimized design of the wind turbine, the wind vane can be arranged at one end of the shaft (in the area of ​​the shaft end), preferably at the (open end of the) generator. Furthermore, a (conical) tip can be provided at the opposite end of the shaft (where the generator is not located). Both the generator and the tip can be arranged outside the bracket, at the respective shaft end.

[0016] Furthermore, it may also be required that the wind turbine contains at least one element from the following list: - a mast directly and / or indirectly connected to the support to hold the wind turbine, in particular at a desired height, - a joint mechanism, in particular in the form of a rotary joint, in order to be able to rotate at least part of the wind turbine with the wing towards the wind, - a slip ring contactor (between the cable) to prevent the cable from untwisting when the wind turbine rotates with the blade, - a consumer that stores, consumes and / or converts the energy of the generator, - at least one cable that connects the generator to the consumer, especially electrically.

[0017] The mast allows the wind turbine to be easily attached to an object, such as a house or a foundation, and installed at a predetermined height, which can be determined by the mast length. A joint mechanism, particularly a swivel joint, can be installed between the mast and the wind turbine mount to allow the wind turbine to easily align itself with the wind. A mast from a home radio antenna, for example, can serve as the mast.

[0018] Furthermore, a slip ring contactor, also called a rotary contact, can be provided between or on the cable so that free rotation of the wind turbine does not lead to untwisting of the cable, which could ultimately cause it to break.

[0019] Finally, the cable of the wind turbine can be routed to a consumer or an electrical storage unit to supply it with electrical power from the generator.

[0020] In this way, the installation of the wind turbine and the use of the wind turbine's energy can be easily improved.

[0021] Within the scope of the invention, it may be advantageous for the wind turbine to have two shafts arranged along the same axis of rotation, with the first end of the at least one blade and the second end of the at least one blade preferably being attached to different shafts. This reduces weight because, instead of a single continuous shaft, two smaller shafts are used along the same axis of rotation, reducing the required material and weight, which in turn leads to better / optimal utilization of wind conditions.

[0022] It is also conceivable that at least one end of a vane could be directly connected to the bearing of a shaft end to allow free rotation of the vane. This represents a kinematic reversal, since in this case the shaft end can be rigidly connected to the support.

[0023] Furthermore, it can also be provided that the wind turbine has two blades, which are preferably arranged symmetrically to at least one shaft. Two blades, which are preferably arranged symmetrically, enable a more balanced (meaning rotationally symmetric weight compensation) design of the wind turbine, thereby reducing friction, leading to better / optimal utilization of the wind turbine and a reduction in noise pollution. The total wind attack surface of the blades can also be increased. Furthermore, it is conceivable for the wind turbine to have three or more blades. Despite the higher costs for more blades, a higher number of blades has the advantage that the wind conditions are optimally utilized.

[0024] It is also conceivable for the mount to be U-shaped or semicircular, with the wind turbine preferably being arranged between the two ends of the U-shaped or semicircular mount. In the following, we will only refer to a U-shaped mount, although the mount can be semicircular or semi-elliptical. By positioning the wind turbine between both ends of a U-shaped mount, the wind turbine is held from two sides, which stabilizes the wind turbine, which in turn increases safety and reduces noise pollution.

[0025] Within the scope of the invention, it is conceivable for the generator to be arranged outside the two ends of the U-shaped bracket. This arrangement balances the wind turbine and the generator via the bracket, resulting in increased stability, greater safety, and a reduction in noise pollution.

[0026] Furthermore, it can also be provided that an additional mirrored U-bracket is attached to the U-shaped bracket, so that the two U-shaped brackets form an O-shaped or circular or elliptical or rectangular bracket.

[0027] This double design of the U-shaped bracket improves stability, which improves the safety and product life of the wind turbine.

[0028] According to the invention, it is conceivable that the rotational volume of the blade, when rotating around the shaft, assumes at least approximately the shape of a sphere or a horizontal "8," i.e., "°°." A rotational volume that approximately assumes the shape of a sphere or a horizontal "8," distributes the weight of the wind turbine as evenly as possible, which at least reduces friction and vibrations, thus reducing noise pollution and improving safety.

[0029] It is also conceivable for the generator to be integrally mounted within the bracket, and for the cables to be routed within the bracket and / or the mast, so that the cables are at least partially invisible. "Integrally mounted within the bracket" means that part of the bracket also simultaneously forms a (single-material) part of the generator; for example, the bracket can form part of the generator housing. This integration of the generator and cable can improve safety and reliability, as the generator and cables are protected from the elements.

[0030] With regard to the present invention, it is conceivable that the at least one blade is twisted (e.g., like a coil spring), so that in a frontal view, a first surface of the blade is visible at the first end of the blade, while a second surface of the blade is visible at the second end of the blade. This improves the utilization of wind conditions and the efficiency of the wind turbine, as the effective surface of the blade of the wind turbine is increased.

[0031] Furthermore, within the scope of the invention, it can be provided that the bracket and the mast are separable, preferably reversibly. It is also conceivable for the individual components to be detachably connected to one another, preferably reversibly, so that the wind turbine can be easily assembled and disassembled. The reversible assembly and disassembly allows for cost-effective production and easy transport. The joint mechanism, in particular the swivel joint, can also be arranged between the mast and the bracket.

[0032] It is also conceivable that at least one blade is flexible and that at least one shaft has different connection points for the blade, allowing different blade geometries to be realized during construction. This allows the wind turbine to be adapted to different conditions, which in turn improves efficiency and the utilization of wind conditions.

[0033] With regard to the present invention, it is conceivable that a turbulator, such as a serrated band, is provided on the at least one blade, wherein the turbulator is preferably provided on a profile upper side of the at least one blade. Such a turbulator prevents and / or delays flow separation, thereby achieving improved utilization of wind conditions.

[0034] With regard to the present invention, it is conceivable that the at least one blade and the support are formed from different materials. This allows the blades and the support to be manufactured from materials that are optimally adapted to their respective tasks, resulting in greater safety and better utilization of wind conditions.

[0035] With regard to the present invention, it is conceivable that the at least one blade and the support are formed from the same material. This makes the production of the wind turbine more cost-effective, since only one material needs to be processed.

[0036] Ideally, the blade and / or the mounting bracket are made of metal to achieve high mechanical stability. Corrosion-resistant materials such as brass, stainless steel, copper, light metals (e.g., aluminum), or plastics, or combinations thereof, are preferred, including coatings. For example, the blade core can be made of metal and coated to achieve optimal adaptation to weather and wind conditions.

[0037] Below, a number of technical and / or physical properties of the wind turbine according to the invention are listed, which serve to define the claimed wind turbine.

[0038] The wind turbine can be designed with a total height (H) of less than or equal to 30 m, preferably less than or equal to 20 m, and particularly preferably less than or equal to 12 m, measured from the top edge of the foundation to the maximum extension of the turbine. This allows the turbine to be used in residential areas and in private areas.

[0039] It is also conceivable that the total weight of the wind turbine (without the mast) is less than 150 kg, preferably less than 100 kg, and especially preferably less than 50 kg. Ideally, the turbine weighs around 30 kg. Due to its low weight, the turbine can also be mounted and used on existing roofs or simple masts.

[0040] Furthermore, the external dimensions (max. height and / or max. width) of the wind turbine (without mast) can be less than 7,500 mm, preferably less than 5,000 mm, and particularly preferably less than 2,500 mm. Advantageously, the external dimensions of the wind turbine are slightly less than 2,000 mm to facilitate easy installation.

[0041] It is also optionally conceivable that the power generated (by the generator) of the wind turbine is significantly less than 500 kW, preferably less than 100 kW, and particularly preferably less than 10 kW, with the generator in particular generating a (single-phase) voltage of approximately 230 V or a (three-phase) voltage of approximately 400 V. This makes the system powerful enough to reliably support the electrical energy needs of at least a single-family home or apartment building.

[0042] Furthermore, the wind turbine may generate a maximum noise level of 65 dB at a shaft rotation speed of less than 2,500 rpm, preferably a maximum noise level of 53 dB at a shaft rotation speed of less than 2,000 rpm, and particularly preferably a maximum noise level of 42 dB at a shaft rotation speed of less than 1,500 rpm. Thus, the turbine does not generate any disturbing noise or noise for the immediate surroundings when operating at full load.

[0043] Further measures improving the invention will become apparent from the following description of exemplary embodiments of the invention, which are schematically illustrated in the figures. All features and / or advantages arising from the claims, the description, or the drawings, including design details, spatial arrangements, and possibly also method steps, may be essential to the invention both individually and in various combinations within the scope of the claims. It should be noted that the figures are merely descriptive and are not intended to limit the invention in any way. It schematically shows: Fig. 1 an embodiment of a U-shaped holder of the wind turbine according to the invention with a one-piece shaft, Fig. 2 an embodiment of a circular holder of the wind turbine according to the invention with a two-part shaft, Fig. 3a-d schematic views of the wind turbine according to the invention, and Fig. 4 schematic rear view of the wind vane on the generator.

[0044] In the figures, identical features and parts are always provided with the same reference symbols, which is why they are usually described only once.

[0045] Fig. 1 shows a schematic side view of an embodiment of a wind turbine 1 according to the invention with a total height H. The wind turbine 1 has at least one shaft 2 to which at least one blade 3 (preferably two blades) is directly and / or indirectly attached. The at least one blade 3 is designed in the shape of a strip or band and extends along an axis of rotation of the one-piece shaft 2 and in an arc radially to the axis of rotation of the shaft 2, wherein the at least one blade 3 is attached with a first end 3.1 and a second end 3.2 to the one-piece shaft 2 (or its shaft stub 2, see Fig. 2), wherein the first end 3.1 and the second end 3.2 of the at least one vane 3 are spaced apart both axially and by an angle of rotation relative to the rotational axis of the shaft 2, and in particular can wrap around the rotational axis of the shaft 2. The shaft 2 with the vanes 3 is (rotatably) mounted in a holder 5. Thus, the existing vanes 4 can be arranged quasi-horizontally in the holder 5.

[0046] As in Fig. 2 (unlike in Fig. 1), the wind turbine 1 can have two separate shafts 2 or shaft stubs 2 arranged along a (common / imaginary) axis of rotation. In this case, it can additionally be provided that the first end 3.1 of the at least one blade 3 is provided on a first shaft 2 or shaft stub 2, and the second end 3.2 of the at least one blade 3 is provided on a second shaft 2 or shaft stub 2.

[0047] As in Fig. 1, it is also possible for the wind turbine 1 to comprise two blades 3, which are preferably arranged symmetrically to the axis of rotation of the at least one shaft 2. Even with two or more blades 3, it can be provided that the wind turbine 1 has two shafts 2 or shaft stubs 2, wherein the first ends 3.1 of the blades 3 can be arranged on a first shaft 2 or shaft stub 2 and the second ends 3.2 of the blades 3 can be arranged on a second shaft 2 or shaft stub 2.

[0048] The shaft 2 (or the two shaft stubs 2) can be designed to be rotatable via at least one, preferably two bearing(s) 14, in particular for holding the holder 5.

[0049] In addition, Fig. 1 shows a generator 4 driven by the rotation of at least one shaft 2 or a shaft stub 2, wherein the shaft 2 is driven by an air flow, in particular by the wind, through the at least one blade 3. The generator 4 is preferably arranged on the same axis of rotation as the at least one shaft 2. A gearbox can also be arranged between the shaft 2 and the generator 4.

[0050] In order for the wind turbine 1 according to the invention to be optimally aligned to the wind W or the corresponding wind direction W (see arrow), a wind vane 9 is provided. In the present example (see Fig. 1 and 2) are arranged directly on the generator 4 (on the opposite side of the shaft 2 or the shaft stub 2).

[0051] On the opposite side, a tip 11 is provided at the end of the shaft 2 or the shaft stub 2, which is preferably shaped like a truncated cone. This allows the wind resistance of the turbine 1 to be optimized.

[0052] In the Fig. Figure 4 is a schematic rear view of the wind turbine 1 (against the wind direction W from Fig. 1) to better identify the flat wind vane 9 with its narrow width. Preferably, the wind vane 9 can be designed in the shape of a leaf or board. It is also conceivable for the wind vane to be attached directly to the generator 4 or the bracket 5.

[0053] Furthermore, as in the Fig. As shown in Figures 1 and 2, at least one joint mechanism 12, in particular a swivel joint 12, is provided, preferably between the mast 6 and the bracket 5 (lower bracket 5.1), for free rotation of the wind turbine 1 (due to the wind or the wind vane 9). This allows the wind turbine 1 to rotate in the direction of rotation D (see arrow), e.g., around the mast 6. It is also conceivable for the mast 6 to rotate along with the wind turbine 1.

[0054] To transport the energy from the generator 4 to a consumer 7, at least one cable 8 is provided. This cable 8 is preferably housed in the holder 5 and / or in the mast 6, thereby providing optimal protection from external influences (weather influences, UV radiation, etc.). To prevent the cable 7 from being wound up and potentially destroyed by the rotation of the wind turbine 1, a slip-ring contactor 13 or rotary contact 13 can be arranged between the cable 8.

[0055] Furthermore, in Fig. 1 discloses a holder 5, in particular only a lower holder 5.1, which is preferably designed as a U-shaped or semicircular holder 5. The one-piece shaft 2 and the at least one vane 3 can be arranged within the holder 5 or lower holder 5.1.

[0056] Furthermore, as in Fig. 2, it can be provided that a second mirrored holder 5, in particular an upper holder 5.2, is attached to the holder 5, so that a double holder 5, in particular an O-shaped or circular holder 5, is formed, whereby the stability of the entire wind turbine 1 is improved.

[0057] In addition, in the Fig. 1 and 2 show the mast 6, which holds the bracket 5. The bracket 5 and the mast 6 can be reversibly and detachably connected to one another, in particular to enable easy assembly and disassembly. Additionally, a cable 8 is shown that connects the generator 4 to a load 7, in particular electrically, wherein the generator 4 and / or the cable 8 are arranged at least partially within the bracket 4 and / or within the mast 6.

[0058] In addition, Fig. 1 and 2 show, by way of example, a turbulator 10, in particular a serrated band, which is arranged on the at least one wing 3.

[0059] In the Fig. 3a to 3d show further exemplary embodiments of the holder 5 with and without an upper holder 5.2 from Annex 1. The two Fig. 3a and 3b show a rectangular or U-shaped bracket 5, whereby the lower bracket 5.1 serves to arrange the wind turbine 1 on the masts 6. In contrast, the two comparable Fig. 3c and 3d an elliptical holder 5. Furthermore, 2 differently designed wind vanes 9 (in the Fig. 3a and Fig. 3c) to highlight the individual design options. By modifying the shape of the bracket 5 and the wind vanes 9, the appearance and stability of the entire wind turbine 1 can be optimized and, if necessary, individually adapted to an owner. List of reference symbols 1 wind turbine 2nd wave 3 wings 3.1 first end of the wing 3.2 second end of the wing 4 Generator 5 Bracket 5.1 lower bracket 5.2 upper bracket 6 masts 7 consumers 8 cables 9 Wind vane 10 Turbolator 11 top 12 Joint mechanism, especially swivel joint 13 Slip ring contactor / rotary contact 14 Storage W Arrow for wind direction D Arrow for direction of rotation H Total height QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 32 46 694 A1

[0002]

Claims

[1] Wind turbine (1), in particular a small wind turbine preferably for private use, comprising - at least one wave (2), - at least one wing (3) which is directly or indirectly fastened to the at least one shaft (2), wherein the at least one wing (3) is designed in the form of a strip and is preferably twisted and wraps around an axis of rotation of the shaft (2), wherein the at least one wing (3) is fastened to the at least one shaft (2) with a first end (3.1) and a second end (3.2) wherein preferably the first end (3.1) and the second end (3.2) of the at least one wing (3) are spaced apart both axially and by an angle of rotation with respect to the axis of rotation of the shaft (2), - a generator (4) connected to the shaft (2) and suitable for converting a rotation of the shaft (2) into energy, preferably electrical energy, - a holder (5) which is connected (directly and / or indirectly) to the at least one shaft (2) and / or the generator (4), characterized by , that the wind turbine has a wind vane (9) by means of which the wind turbine (1) aligns itself independently to the wind. [2] Wind turbine (1) according to claim 1, characterized by that the wind turbine (1) contains at least one element from the following list: - a mast (6) which is directly and / or indirectly connected to the support (5) to hold the wind turbine, - a joint mechanism (12), in particular in the form of a rotary joint, in order to be able to rotate at least part of the wind turbine (1) with the wing (3) towards the wind, - a slip ring contactor (13) (between the cable) to prevent the cable (8) from untwisting when the wind turbine (1) rotates with the blade (3), - a consumer (7) that stores, consumes and / or converts the energy of the generator (4), - at least one cable (8) that connects the generator (4) to the consumer (7), in particular electrically. [3] Wind turbine (1) according to one of claims 1 or 2, characterized by in that the wind turbine (1) has two shafts (2) which are arranged in a same axis of rotation, wherein the first end (3.1) of the at least one blade (3) and the second (3.2) end of the at least one blade (3) are preferably fastened to different shafts (2). [4] Wind turbine (1) according to one of the preceding claims, characterized by that the wind turbine has two blades (3) which are preferably arranged symmetrically to the at least one shaft (2). [5] Wind turbine (1) according to one of the preceding claims, characterized bythat the holder (5) has a U-shaped or semicircular holder (5), wherein at least the shaft with the wings is preferably arranged between the two ends of the U-shaped or semicircular holder (5). [6] Wind turbine (1) according to claim 4 characterized by that the generator (4) is arranged outside the two ends of the U-shaped or semi-circular holder (5). [7] Wind turbine (1) according to claim 4 or 5 characterized by that an additional mirrored bracket (5) is attached to the U-shaped or semi-circular bracket (5) so that the two brackets (5) form an O-shaped or circular bracket (5). [8] Wind turbine (1) according to one of the preceding claims, characterized by that the rotation volume of the wing (3) assumes at least approximately the shape of a sphere when the wing (3) rotates around the shaft (2). [9] Wind turbine (1) according to one of the preceding claims, characterized by that the generator (4) is integrally accommodated in the holder (5) and the cables (8) are guided within the holder (5) and / or the mast (6) so that the cables (8) are not visible, at least in sections. [10] Wind turbine (1) according to one of the preceding claims, characterized by that the at least one wing (3) is twisted so that in a frontal view a first surface of the wing (3) can be seen at the first end (3.1) of the wing (3), while a second surface of the wing (3) can be seen at the second end (3.2) of the wing (3). [11] Wind turbine (1) according to one of the preceding claims, characterized by that the holder (5) and the mast (6) are separable, preferably reversibly. [12] Wind turbine (1) according to one of the preceding claims, characterized bythat the individual components are detachably connected to one another, preferably reversibly, so that the wind turbine (1) can be easily assembled and disassembled. [13] Wind turbine (1) according to one of the preceding claims, characterized by that the at least one wing (3) is flexible and the at least one shaft (2) has different connection points for the wing, so that different wing geometries can be realized during construction. [14] Wind turbine (1) according to one of the preceding claims, characterized by that a turbulator (10), such as a serrated band, is provided on the at least one wing (3), wherein the turbulator (10) is preferably provided on a profile upper side of the at least one wing (3). [15] Wind turbine (1) according to one of the preceding claims, characterized by that the at least one wing (3) and the holder (5) are formed from different materials. [16] Wind turbine (1) according to one of the preceding claims, characterized by that the at least one wing (3) and the holder (5) are formed from the same material. [17] Wind turbine (1) according to one of the preceding claims, characterized by that a total height (H) of the wind turbine (1) is less than or equal to 30 m, preferably less than or equal to 20 m, and particularly preferably less than or equal to 12 m. [18] Wind turbine (1) according to one of the preceding claims, characterized by that the total weight of the wind turbine (1) (without mast (6)) is less than 150 kg, preferably less than 100 kg and particularly preferably less than 50 kg. [19] Wind turbine (1) according to one of the preceding claims, characterized by that the external dimensions of the wind turbine (1) (without mast (6)) are less than 7,500 mm, preferably less than 5,000 mm and particularly preferably less than 2,500 mm. [20] Wind turbine (1) according to one of the preceding claims, characterized by , that the power generated (by the generator (4)) of the wind turbine (1) is less than 500 kW, preferably less than 100 kW and particularly preferably less than 10 kW, wherein in particular the generator generates a (single-phase) voltage of approximately 230 V or a (three-phase) voltage of approximately 400 V. [21] Wind turbine (1) according to one of the preceding claims, characterized by that the wind turbine (1) generates a noise level of maximum 65 dB at a rotation (of the shaft (2)) of less than 2,500 rpm, preferably a noise level of maximum 53 dB at a rotation of less than 2,000 rpm, and particularly preferably a noise level of maximum 42 dB at a rotation of less than 1,500 rpm.

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