Electric generator for a wind turbine, stator device for an electric generator, and wind turbine

Abstract

Electric generator for wind turbine, stator device for electric generator, and wind turbine The present invention relates to an electric generator (7) for a wind turbine (1), comprising a stator (11), a rotor (10) rotatably mounted on the stator (11), and an air cooling system (32) for guiding an air flow along an air path (33) extending through the electric generator (7). The stator (11) comprises at least one structural component (21) having a hollow cross-sectional profile and having at least one first opening (39) and at least one second opening (40), each of the openings (39, 40) extends into the hollow interior of the individual structural component (21), at least one first opening (39) is positioned on or fluidly communicating with the first position of the air path (33), and at least one second opening (40) is positioned on or fluidly communicating with the second position of the air path (33), and at least one first opening (39) and / or at least one second opening (40) within the at least one first opening (39) and / or at least one second opening (40). At least one sealing device (38) is placed inside to prevent air flow from flowing through the interior.

Description

Technology Field

[0001] The present invention relates to an electric generator for a wind turbine comprising a stator, a rotor rotatably mounted with respect to the stator, and an air cooling system for guiding an airflow that flows along an air path extending through an electric generator. Background Technology

[0002] Wind turbines typically comprise an electric generator or electric machine and a rotatably mounted hub having multiple blades. The wind-driven rotation of the hub is transmitted to the rotor of the electric generator. The electric generator is typically housed within a nacelle, which is located at the top of the wind turbine tower. Modern wind turbines can have a total height of tens or hundreds of meters. The output power of the electric generator can be in the range of several megawatts, specifically from 1 to 40 megawatts.

[0003] To generate energy, the components of the stator and rotor interact magnetically with one another. However, since this interaction causes heat generation, an important aspect of the operation of an electric generator is providing sufficient cooling to these components. Typically, cooling air is directed toward these components, and heat is transferred from these components to the cooling air.

[0004] With respect to the mechanical structure of the stator, structural components such as hollow bars are typically provided to realize a support structure of the stator for supporting a stacked stack. Examples of individual support structures are disclosed in WO 2021 / 170306 A1 and WO 2022 / 263070 A1.

[0005] The purpose of the present invention is to provide an improved concept for an electric generator of a wind turbine, particularly with respect to the cooling system and mechanical aspects.

[0006] According to the present invention, this objective is achieved by the electric generator described earlier, wherein the stator comprises at least one structural component having a hollow cross-sectional profile and having at least one first opening and at least one second opening, each of the openings leading into the hollow interior of the individual structural component, at least one first opening is positioned at or fluidly communicating with the first position of an air path, and at least one second opening is positioned at or fluidly communicating with the second position of an air path, and at least one sealing device is positioned within the at least one first opening and / or within the at least one second opening to prevent air flow from flowing through the interior.

[0007] An electric generator comprises a stator and a rotatably mounted rotor, which may be housed within the electric generator's housing. Electromagnetically active components of the stator and rotor, particularly stacked stacks and / or windings and / or permanent magnets, are provided, and electromagnetic interactions between these electromagnetically active components cause the generation of electrical energy while the rotor rotates. This, in turn, causes the generation of heat. The electromagnetically active components are cooled by an air cooling system, that is, by air flowing through an air path. The air cooling system may include an air pump, particularly a ventilator, to drive the airflow. The air cooling system may be an open system in which the airflow is guided from an air inlet to an air outlet. Fresh air from outside the wind turbine is supplied through the inlet, and after the air flows through the air path, it is discharged to the outside through the outlet. The air cooling system may be a closed system in which the air path is a circuit. A heat exchanger may be present in the air path, and heat is transferred from the air to the heat exchanger.

[0008] According to the present invention, a first position and a second position are positioned on different positions within an air path, so that the first position and the second position are connected by a section of the air path extending between the first position and the second position. The individual positions may be positions, parts, or sections of the air path. Since openings are positioned on or fluidly communicating with these positions, there is essentially another fluid connection between the first position and the second position, namely, the interior of a structural component extending between the individual openings. However, this could potentially lead to airflow from the first position to the second position through the interior of the structural component, which is disadvantageous because the proper operation of an air cooling system typically requires air to flow through the air path rather than through other components such as the structural component. To prevent air from flowing from the first position to the second position through the interior of the structural component and to ensure that air flows from the first position to the second position through the section of the air path extending between these positions, a sealing device is provided to close at least one first and / or second opening.

[0009] According to the present invention, the sealing device is positioned within an individual opening. Preferably, the sealing device is positioned within a cross-sectional profile. Thus, the extent of the sealing device is, at most, equal to the size of the opening or the hollow inside the structural component. Compared to other options not part of the present invention, the sealing device may be positioned over the opening like a cap, but this often leads to the problem of insufficient fit between the sealing device and the opening or structural component. Due to manufacturing tolerances, the dimensions of the structural component are often not very precise, which means that if the individual profile is too narrow, the sealing device becomes loose, or if the individual profile is too large, the sealing device cannot be mounted without force. According to the present invention, the size of the sealing device may be smaller than the size of the opening or the hollow inside, so that the sealing device can be positioned in its designated position without problems.

[0010] Preferably, a clearance exists between the sealing device and at least one wall of an individual structural component. Variations in the dimensions of different structural components can be compensated for by different dimensions of the clearance. In particular, after the sealing device is attached to an individual structural component by means of attachment, there may be a loose fit between the sealing device and the individual structural component. The clearance may be sealed by a particularly airtight sealing material. The sealing material may be elastic. The sealing material may be applied into the gap realizing the clearance, particularly after the sealing device has been moved to its designated position. The sealing material can eliminate the loose fit. The sealing material ensures that air cannot enter the interior of the structural component through the clearance.

[0011] The sealing device may be, in particular, a flat or planar sealing plate or may include such a plate. The dimensions of the sealing plate along a plane extending along the sealing plate may be at least 10 times, preferably at least 100 times, larger than the thickness of the sealing plate. The sealing device, for example, the sealing plate, may be composed of an airtight material, for example, metal and / or plastic material.

[0012] The sealing device may be attached to individual structural components by at least one attachment means. For example, the attachment means realizes a screw connection or a welded connection, etc. The sealing device may be attached to at least one wall of the structural component.

[0013] Preferably, at least one side flange that can extend vertically away from the sealing plate may be disposed on the sealing plate, and attachment means, in particular screw connections, connect at least one side flange to individual structural components. The flange may be oriented away from the interior of the structural component. The flange and the structural component may each have a bore, these bores may be collinearly arranged with respect to each other, and bolts may be disposed within these bores. The bolts may be threaded and may be secured by nuts. Preferably, at least one pair consisting of two side flanges disposed on opposite sides of the sealing plate is provided.

[0014] In particular, with respect to a state in which a sealing component is absent, the interior of at least one structural component extending from at least one first opening to at least one second opening may bypass a cooling section of an air path through which heat is transferred from a component of an electric generator to be cooled to the air of an airflow. Again, in particular with respect to a state in which a sealing component is absent, the interior of an individual structural component extending from at least one first opening to at least one second opening may bypass a transfer section of an air path through which heat is transferred from the air of an airflow to a cooling component of a cooling system. Thus, if at least a portion of the air bypasses the cooling section and / or the transfer section, the cooling power will be reduced. This is prevented by a sealing device. The cooling section may be an air gap placed between the stator and the rotor and / or the radially inner or outer side of the stator and / or the radially inner or outer side of the rotor. The cooling component may be a heat exchanger for transferring heat away from the airflow.

[0015] Preferably, at least one structural component is part of the stator's support structure for supporting at least one stacked stack. The support structure may be like a lattice. The stacked stack may consist of several steel plates placed on top of each other. Optionally, at least one structural component is a bar. The bar may be made of metal, for example, steel. The bar may be made of a monolithic, particularly rectangular, hollow metal profile. The bar may be a longitudinal bar extending along the longitudinal direction of the electric generator. The support structure may include at least one circumferential bar and / or plate extending along the circumferential direction of the electric generator, and at least one circumferential bar and / or plate is positioned perpendicular to at least one longitudinal bar. The longitudinal bars may extend parallel to each other. The circumferential bars and / or plates may extend parallel to each other.

[0016] At least one structural component, in particular at least one longitudinal bar, may include an open or closed cross section. The open cross section may be U-shaped. At least one structural component, in particular at least one longitudinal bar, includes a rectangular cross section. Accordingly, the structural component may be composed of four walls, the walls being parallel to each other in pairs, and adjacent walls being perpendicular to each other.

[0017] At least one structural component, in particular at least one longitudinal bar, may include at least one attachment bore for attaching a stacked stack to an individual structural component and / or at least one access bore for enabling tools to be inserted into the hollow of the individual structural component. At least one bore may be a first opening or a second opening. The attachment bore and / or access bore may be through holes penetrating the wall of the structural component. The attachment bore and / or access bore may be arranged along a line. This line extends particularly along the longitudinal direction of the individual bar. The attachment bore and access bore may be arranged on the opposing walls of the individual bar. At least one attachment bore and / or at least one access bore may fluidly communicate with a first location or a second location through radial air channels provided within the stacked stack or between multiple stacked stacks.

[0018] According to a preferred embodiment of the present invention, at least one first opening or at least one second opening is realized by at least one open front end of each longitudinal bar, in particular by at least one open front end surface, and the first position and / or second position is positioned on the longitudinal front end of the stator. The cutting surface for realizing the opening may be perpendicular to the longitudinal direction of the longitudinal bar. However, it is also possible for each cutting surface to be inclined with respect to the longitudinal direction, and the angle between the cutting surface and the longitudinal direction may be less than 90°.

[0019] In particular, a finger plate extending along the circumferential direction of an electric generator supports stator end windings, and the finger plate is positioned on the front end surface of at least one longitudinal bar. The finger plate may include a disc-shaped or ring-shaped structure. The fingers of the finger plate may protrude radially outward, and the windings are positioned within the gaps between the fingers. The windings may extend around the fingers in a U-shape.

[0020] Furthermore, the present invention relates to a stator device for an electric generator according to the foregoing description. According to the present invention, the objective is solved by this stator device, and the stator device is the stator of an electric generator. Alternatively, the objective is solved by this stator device, and the stator device is a stator segment of the stator of an electric generator. For reasons of transportability, the stator itself may be divided into several stator segments, each of which may include a stacked stack that defines stator teeth and carries stator windings. A complete stator consists of several stator segments arranged along the circumferential direction and attached to one another. Each stator segment may extend along a portion of the complete circumference of the stator. The number of stator segments forming the stator may be from 4 to 24. Thus, each stator segment may cover an angle range of 90° to 15°, particularly 45° or 30°. All features, advantages, and aspects described in relation to the electric generator according to the present invention apply likewise to the stator device according to the present invention, and vice versa.

[0021] Finally, the present invention relates to a wind turbine, and the object is solved by a wind turbine comprising an electric generator according to the individual descriptions above. All features, advantages, and aspects described in relation to the electric generator and / or the stator device according to the present invention apply likewise to the wind turbine according to the present invention, and vice versa. Brief explanation of the drawing

[0022] Other objects and features of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings. However, the drawings are principle sketches designed merely for illustrative purposes and do not limit the invention. The drawings illustrate the following: Fig. 1 A drawing of a wind turbine according to an embodiment of the present invention, comprising an electric generator according to an embodiment of the present invention, wherein the electric generator comprises a stator composed of several stator segments according to an embodiment of the present invention, Fig. 2 FIG. 1 is a cross-sectional view of an electric generator of a wind turbine, and the cross-sectional plane is indicated by line II-II in FIG. 1, FIGS. 3 to 5 These are perspective views of the stator segments of the generator of FIG. 2, and FIGS. 6 to 8 These are schematic sketches of a longitudinal cross-sectional view of the generator in FIG. 2 to illustrate the cooling system of this generator, and Fig. 9 FIG. 2 is an enlarged perspective view of the stator segment of the generator, Fig. 10 FIG. 9 is a cross-sectional view of the front end of the longitudinal bar of the stator segment, and Fig. 11 This is a cross-sectional view of the screw connection placed at the front end of Fig. 10. Specific details for implementing the invention

[0023] FIG. 1 illustrates a wind turbine (1) according to an embodiment of the present invention. The wind turbine (1) comprises a tower (2) with a nacelle (3) positioned at the top. A hub (4) having several, in particular three, blades (5) is provided at the front of the nacelle (3). The hub (4) is mounted to rotate around a rotation axis (6). The wind-driven rotation of the hub (4) is transmitted to an electric generator (7) according to an embodiment of the present invention, located within the nacelle (3). The rotation of the hub (4) is transmitted to the electric generator (7) by a main shaft (8) extending along the rotation axis (6).

[0024] The electric generator (7) includes a stator (10) and a rotor (11), exemplary in that an inner stator (10) and an outer rotor (11). The stator (10) and the rotor (11) are placed within the housing (9) of the generator (7). While the stator (10) is mounted so as not to rotate, the rotor (11) is connected to a main shaft (8) so that the rotation of the hub (4) is transmitted directly to the rotor (11). The wind turbine (1) is a direct-drive wind turbine. Alternatively, the shaft (8) and the rotor (11) may be connected by a gear assembly. A bearing assembly (not shown in FIG. 1) is provided to hold the shaft (8) in place. While the total height of the wind turbine (1) is approximately tens or hundreds of meters, the output power of the wind turbine (1) generated by the generator (7) may be in the range of several megawatts, particularly 1 to 40 megawatts.

[0025] The rotation axis (6) is positioned horizontally but may also be inclined with respect to the horizontal direction. The rotation axis (6) extends along the longitudinal direction (12), and the radial direction (13) is perpendicular to the longitudinal direction (12) and extends radially outward from the rotation axis (6). The circumferential direction (14) is given by the direction of the point rotating around the rotation axis (6). The directions (12, 13, 14) relate to the stator (10), the rotor (11), and the stator segments (16) which are the stator devices (50) according to an embodiment of the present invention, as well as the generator (7).

[0026] FIG. 2 illustrates a cross-sectional view of a generator (7), and the cross section indicated by line II-II of FIG. 1 is perpendicular to the longitudinal direction (12). The stator (10) is attached to a housing (9) (not shown in FIG. 2). Permanent magnets (15) are placed on the rotor (11) on the side facing the stator (10). The stator (10) comprises several stator segments (16), each comprising stacked stacks (17). In this example, eight stator segments (16) are provided. An air gap (18) exists between the stator (10) and the rotor (11). The stator segments (16) are mounted on the stator support structure (19) of the electric generator (7). Rotation of the rotor (11) relative to the stator (10) induces an electric current in the stator coils formed by the stator windings.

[0027] Next, refer to FIGS. 3 and 4, which illustrate perspective views of a segment-type support structure (20) of one of the segments (16), wherein the support structure (20) supports stator windings and stacked stacks (17) not illustrated in FIGS. 3 and 4. The support structure (20) comprises several structural components (21) which are longitudinal bars (22) extending along the longitudinal direction (12). The longitudinal bars (22) have hollow cross-sectional profiles having a rectangular geometric structure. The longitudinal bars (22) are made of monolithic rectangular metal profiles such that the longitudinal bars (22) are composed of four walls (23), the opposing walls (23) are parallel in pairs, and the adjacent walls (23) are perpendicular to each other in pairs.

[0028] Each longitudinal bar (22) includes several attachment bores (24) for attaching stacked stacks (17) and stator windings to a support structure (20). Furthermore, each longitudinal bar (22) includes several access bores (25) to allow tools to be inserted into the hollow interior of each longitudinal bar (22). The attachment bores (24) and access bores (25) are through holes penetrating individual walls (23). The attachment bores (24) and access bores (25) are arranged along lines, and the line associated with the attachment bores (24) and the line associated with the access bores (25) are arranged on opposite walls (23).

[0029] The support structure (20) includes two circumferential bars (26), which are longitudinal end plates attached to longitudinal bars (22) and extending along the circumferential direction (14). The open front ends (31) of the longitudinal bars (22) penetrate the individual holes of the circumferential bars (26). Furthermore, several circumferential plates (27) extending along the circumferential direction (14) are positioned between two adjacent longitudinal bars (22).

[0030] Another component of the support structure (20) shown in FIG. 4, although not shown in FIG. 3, is a finger plate (28) extending along the circumferential direction (14). The finger plate (28) includes fingers (29) that are positioned on the front end faces of the longitudinal bars (22) and extend outwardly along the radial direction (13). As becomes apparent from FIG. 5, which shows a perspective view of one of the stator segments (16) supporting the stacked stacks (17), the end windings (30) of the stator windings are supported or held by the fingers (29). Specifically, the end windings (30) extend around the fingers (29) in a U-shape.

[0031] As is evident from FIG. 3, the cross-section of each of the front ends (31) is perpendicular to the longitudinal direction (12), while the other cross-section is inclined to the longitudinal direction (12). Thus, the front ends (31) have a U-shaped cross-section, and the U-shaped cross-section has a height that decreases as the distance from the corresponding circumferential bar (26) increases. The finger plate (28) is attached to and contacts the front end surface of each longitudinal bar (22), and thus is attached to and contacts the cross-section perpendicular to the longitudinal direction (12).

[0032] To cool the electromagnetically active components of the stator (10) and rotor (11), the electric generator (7) includes an air cooling system (32) in which an airflow flows along an air path (33). Heat is transferred from the electromagnetically active components to the air in the airflow. FIG. 6 illustrates a schematic sketch of the electric generator (7) in relation to the air cooling system (32). The air path (33) is indicated by dashed arrows. The air cooling system (32) includes several air pumps (34) which are ventilation devices and several heat exchangers (35) for cooling the air in the airflow. According to the present embodiment, the air in the airflow is guided within the circuit, and alternatively, an open system may be realized in which fresh air from outside the wind turbine (1) is provided through an air inlet of the housing (9) or nacelle (3), and after the air flows through the air path, is discharged to the outside through an air outlet of the housing (9) or nacelle (3).

[0033] With respect to the air path (33) indicated by the dashed arrows in FIG. 6, the individual arrows are shown only on the left side of this figure, and the situation is equivalent and mirror-reversed with respect to the right side. First, the air passes through the heat exchanger (35) and is then guided along the longitudinal direction (12) to cool the radially outer side of the rotor (11), and then passes through the radial air channels (36) leading to the radially inner side through the rotor (11). Then, the air flows through the air gap (18) along the longitudinal direction (12) to cool the radially inner side of the rotor (11) and the radially outer side of the stator (10). Next, the air is guided along the radial air channels (37) leading to the radially inner side through the stator (10). Then, the air flows along the longitudinal direction (12) to the radially front end of the stator (10) along the radially inner side of the stator (10). Then, the air is guided radially outward as it passes through the end windings (30) and reaches the heat exchanger (35) again.

[0034] In relation to the open front ends (31) of the longitudinal bars (22), a sealing device (38) is placed within each opening, and the sealing device (38) closes the opening to prevent air from entering the hollow interior of the longitudinal bar (22). Otherwise, the air path (33) would be altered, and certain sections of the air path (33) would be bypassed, which would be disadvantageous with respect to the cooling effect.

[0035] FIGS. 7 and FIGS. 8 illustrate a sketch that is essentially the same as FIG. 6, and two possible variations related to the air path (33) that may occur when the sealing device (38) is absent are indicated by dashed arrows. In relation to the possible variation shown in FIG. 7, the attachment bores (24) can be understood as first openings (39) leading into the hollow interior of the longitudinal bar (22). Each opening of the open front ends (31) of the longitudinal bars (22) can be understood as second openings (40) also leading into the hollow interior of each individual longitudinal bar (22). In this situation, air will enter the interior of the longitudinal bar (22) through the first openings (39) and leave the interior through the second openings (40). Thus, the first openings (39) are fluidly in communication with a first location of the air path (33), which is the air gap (18) or the radial air channels (37). The second opening (40) is positioned at a second location of the air path (33), which is positioned on the longitudinal front end of the stator (10). Thus, the portion of the longitudinal bar (22) extending from the first opening (39) to the second opening (40) bypasses the cooling section (41) of the air path, through which heat is transferred to the air of the airflow from the radially inner side of the stator (10), which would reduce the cooling effect of the stator (10). To avoid this, the sealing device (38) closes the second opening (40).

[0036] In relation to the possible variations shown in FIG. 8, the approach bores (25) can be understood as second openings (40) leading into the hollow interior of each longitudinal bar (22). Each opening of the open front ends (31) of the longitudinal bar (22) can be understood as first openings (39) also leading into the hollow interior of each longitudinal bar (22). In this scenario, air will enter the interior of the longitudinal bar (22) through the first openings (39) and leave the interior through the second openings (40). Thus, the first openings (39) are positioned at a first location of the air path (33), which is positioned on the longitudinal front end of the stator (10). The second openings (40) are fluidly connected to the second location of the air path (33), which is the radially inner or radial air channel (37) of the stator (10). Accordingly, the internal portion of the longitudinal bar (22) extending from the first opening (39) to the second opening (40) bypasses another cooling section (41) of the air path where heat is transferred from the air gap (18) to the air of the airflow, which will reduce the cooling effect of the stator (10) and the rotor (11). Furthermore, the internal portion of the longitudinal bar (22) extending from the first opening (39) to the second opening (40) bypasses the transfer section (42) of the air path (33) where heat is transferred from the air to the cooling component of the cooling system (32), namely the heat exchanger (35), which will also reduce the cooling effect of the electric generator (7). To avoid this, the sealing device (38) closes the first opening (39).

[0037] Whether any of the aforementioned changes will actually occur or whether a combination of these changes will be realized without a sealing device (38) depends on the parameters of the cooling system (32), for example, the operating output of the air pumps (34).

[0038] Next, details regarding the sealing device (38) will be described. FIG. 9 shows an enlarged perspective view of the stator segment (16) associated with the open front ends (31) of the longitudinal bars (22) and the sealing devices (39). The sealing device (38) is mounted inside the individual openings (39, 40). The sealing device (38) is attached to two of the walls (23) by screw connections (43) and various attachment means that specifically realize a loose fit between the sealing device (38) and the walls (23). FIG. 10 shows a cross-sectional view of the front end of one of the front ends (31), with the individual cross-section extending perpendicular to the longitudinal direction (12) and through the screw connections (43). FIG. 11 shows a cross-sectional view of one of the screw connections (43), with the individual cross-section extending perpendicular to the radial direction (13) and through the individual screw connections (43). The sealing device (38) includes a sealing plate (44) that is smaller than the free cross-sectional area of ​​the longitudinal bar (22), so that a gap (45) remains completely around the sealing plate (44) between the sealing plate (44) and the walls (23). The gap (45) is sealed by a flexible sealing material (46) shown only in FIG. 11.

[0039] Next, details regarding the screw connections (43) will be described with the help of FIGS. 10 and FIGS. 11, which illustrates a cross-sectional view through one of the screw connections (43). The sealing device (38) comprises two side flanges (47) positioned and attached to opposite sides of the sealing plate (44). Each of the flanges (47) extends vertically away from the sealing plate (44), i.e., from the interior of the longitudinal bar (22), and is connected to one of the walls (23) by one of the screw connections (43). Each flange (47) and each wall (23) have bores positioned collinearly, through which a threaded bolt (48) passes, and the bolt (48) is secured by a nut (49) to attach the sealing device (38) to each longitudinal bar (22).

[0040] Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the disclosed examples, from which a person skilled in the art can derive other variations without departing from the scope of the invention.

[0041] Regardless of grammatical usage, individuals with male, female, or other gender identities are included in the term.

Claims

Claim 1 An electric generator (7) for a wind turbine (1) comprises a stator (11), a rotor (10) rotatably mounted on the stator (11), and an air cooling system (32) for guiding an air flow along an air path (33) extending through the electric generator (7), wherein the stator (11) comprises at least one structural component (21) having a hollow cross-sectional profile and having at least one first opening (39) and at least one second opening (40), each of the openings (39, 40) leads into the hollow interior of the individual structural component (21), wherein the at least one first opening (39) is positioned at or fluidly communicating with the first position of the air path (33), and the at least one second opening (40) is positioned at or fluidly communicating with the second position of the air path (33), and within the at least one first opening (39) and / or the at least one An electric generator having at least one sealing device (38) disposed within the second opening (40) to prevent the airflow from flowing through the interior. Claim 2 An electric generator according to claim 1, wherein a clearance (45) exists between the sealing device (38) and at least one wall (23) of the individual structural component (21). Claim 3 In paragraph 2, the above gap (45) is sealed by a sealing material (46), an electric generator. Claim 4 In any one of claims 1 to 3, the sealing device (38) is a sealing plate (44) or an electric generator including the sealing plate (44). Claim 5 An electric generator according to any one of claims 1 to 4, wherein the sealing device (38) is attached to the individual structural component (21) by at least one attachment means, and the attachment means realizes a screw connection (43). Claim 6 An electric generator according to claims 4 and 5, wherein at least one side flange (47) extending particularly perpendicularly away from the sealing plate (44) is disposed on the sealing plate (44), and the screw connection (43) connects the at least one side flange (47) to the individual structural components (21). Claim 7 In any one of claims 1 to 6, the interior of the at least one structural component (21) extending from the at least one first opening (39) to the at least one second opening (40) bypasses the cooling section (41) of the air path (33) where heat is transferred from the component to be cooled of the electric generator (7) to the air of the air flow and / or the transfer section (42) of the air path (33) where heat is transferred from the air of the air flow to the cooling component of the cooling system (32). Claim 8 In claim 7, the cooling section (41) is an air gap (18) disposed between the stator (11) and the rotor (10) and / or the radially inner or outer side of the stator (11) and / or the radially inner or outer side of the rotor (10), and / or the cooling component is a heat exchanger (35) for transferring heat away from the airflow, an electric generator. Claim 9 An electric generator according to any one of claims 1 to 8, wherein the at least one structural component (21) is part of a support structure (20) of the stator (11) for supporting at least one stacked stack (17), and the at least one structural component (21) is a longitudinal bar (22) extending along the longitudinal direction (12) of the electric generator (7). Claim 10 In claim 9, the above at least one longitudinal bar (22) comprises a rectangular cross-section, an electric generator. Claim 11 An electric generator according to claim 9 or 10, wherein the at least one longitudinal bar (22) comprises at least one attachment bore (24) for attaching the stacked stack (17) to the individual structural component (21) and / or at least one access bore (25) for allowing tools to be inserted into the hollow of the individual longitudinal bar (22), and the at least one bore (24, 25) is the first opening (39) or the second opening (40). Claim 12 An electric generator according to any one of claims 9 to 11, wherein the at least one first opening (39) or the at least one second opening (40) is realized by at least one open front end (31) of the individual longitudinal bar (22), and the first position and / or the second position is positioned on the longitudinal front end of the stator (11). Claim 13 In claim 12, a finger plate (28) extending along the circumferential direction (14) of the electric generator (7) supports stator end windings (30), and the finger plate (28) is positioned on the front end surface of the at least one longitudinal bar (22), an electric generator. Claim 14 A stator device (50) for an electric generator (7) according to any one of claims 1 to 13, wherein the stator device (50) is - a stator (11) of the electric generator (7) or - a stator segment (16) of the stator (11) of the electric generator (7). Claim 15 A wind turbine (1) comprising an electric generator (7) according to any one of paragraphs 1 to 13.

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