Semi-direct-drive wind driven generator

Abstract

The utility model relates to a semi-direct-drive wind driven generator, which belongs to the technical field of wind power generation, and comprises a stator and a rotor, and further comprises a rigidity enhancing structure used for keeping an air gap between the stator and the rotor; the rigidity enhancing structure is provided with a stator connecting part, a rotor connecting part and a reinforcing rib plate, the stator connecting part is connected with the stator, the rotor connecting part is connected with the rotor, and the reinforcing rib plate is arranged between the stator connecting part and the rotor connecting part so as to enhance the rigidity of the rotor.

Description

Technical Field

[0001] This application relates to the technical field of wind power generation, and particularly to a semi-direct drive wind turbine generator. Background Art

[0002] In current high-power wind turbine generators, the wind turbine generator of a semi-direct drive wind turbine unit is usually integrated with a gearbox. The generator body has a bearingless structure, and the generator mostly adopts a design scheme with a coaxial system with the gearbox. When the generator undergoes factory tests, components such as the gearbox end cover connected to the generator are often lacking, and it is difficult to purchase this gearbox end cover component. Power generation manufacturers often need to design tooling by themselves to assemble the stator and rotor and then conduct factory tests.

[0003] Since the rotor of the semi-direct drive wind turbine generator is not fixed and is in an extended cantilever structure, during the experiment, the rotor is subjected to gravity, eccentric magnetic pulling force, and high-speed centrifugal force, which easily causes the rotor to rub against the stator, resulting in damage to the rotor magnetic steel and the stator iron core, and may even lead to the scrapping of the semi-direct drive wind turbine generator. Therefore, in the process of assembling the stator and rotor of the semi-direct drive wind turbine generator, how to effectively maintain the air gap between the stator and the rotor and avoid the stator from rubbing against the rotor is of great significance to the semi-direct drive wind turbine generator. Utility Model Content

[0004] Aiming at the deficiencies of the prior art, this application provides a semi-direct drive wind turbine generator to maintain the air gap between the stator and the rotor and avoid the stator from rubbing against the rotor.

[0005] To achieve the above object, this application provides a semi-direct drive wind turbine generator, including a stator and a rotor, and further including a stiffness enhancing structure for maintaining the air gap between the stator and the rotor;

[0006] The stiffness enhancing structure has a stator connection part, a rotor connection part, and a reinforcing rib plate. Among them, the stator connection part is connected to the stator, the rotor connection part is connected to the rotor, and the reinforcing rib plate is arranged between the stator connection part and the rotor connection part to enhance the stiffness of the rotor.

[0007] Optionally, the stator connection part has a first through hole for bolt connection with the stator.

[0008] Optionally, the stator connection part is an arc-shaped flange structure or a circular flange structure.

[0009] Optionally, the semi-direct drive wind turbine generator further includes an end cover, which is circular and coaxially arranged with the stator and is tightly connected.

[0010] Optionally, the stiffness enhancing structure is connected to the stator by connecting the end cover.

[0011] Optionally, the end cover is made of carbon steel.

[0012] Optionally, the rotor connection part has a second through hole for bolt connection with the rotor.

[0013] Optionally, the rotor connection part is an arc-shaped flange structure or a circular flange structure.

[0014] Optionally, the stiffness-enhancing structure is made of carbon steel.

[0015] A semi-direct drive wind turbine provided by the present application includes a stator and a rotor, and further includes a stiffness-enhancing structure for maintaining the air gap between the stator and the rotor; the stiffness-enhancing structure has a stator connection part, a rotor connection part, and a reinforcing rib plate, wherein the stator connection part is connected to the stator, the rotor connection part is connected to the rotor, and the reinforcing rib plate is arranged between the stator connection part and the rotor connection part to enhance the stiffness of the rotor. In the semi-direct drive wind turbine provided by the embodiments of the present application, one end of the stiffness-enhancing structure is connected to the stator and the other end is connected to the rotor, and it includes a reinforcing rib plate, thereby improving the stiffness of the rotor of the semi-direct drive wind turbine and maintaining the air gap between the stator and the rotor of the semi-direct drive wind turbine to avoid rubbing between the stator and the rotor.

[0016] In existing semi-direct drive wind turbines, since there is no bearing in the generator body, the rotor generally adopts an extended cantilever structure. The high centrifugal force of this extended cantilever structure at high speeds will cause the rotor to deform more, thereby reducing the air gap between the stator and the rotor, and may cause rubbing between the stator and the rotor. Compared with the existing semi-direct drive wind turbines, a semi-direct drive wind turbine provided by the embodiments of the present application further includes a stiffness-enhancing structure on the basis of the existing generator. This stiffness-enhancing structure connects the stator and the rotor and has a reinforcing rib plate, which can improve the stiffness of the rotor of the semi-direct drive wind turbine, effectively maintain the air gap between the stator and the rotor, and thus reduce the risk of rubbing between the stator and the rotor. Description of the Drawings

[0017] Figure 1 Schematic diagram of the stiffness-enhancing structure and the cover plate structure of an embodiment of the semi-direct drive wind turbine of the present application;

[0018] Figure 2 Schematic cross-sectional structure diagram of the semi-direct drive wind turbine of an embodiment of the present application.

[0019] Reference Signs:

[0020] Hollow shaft 10, air gap 20;

[0021] Stator 100, end cover 110, end cover through hole 111;

[0022] Rotor 200, Motor Rotor Connecting Flange 210;

[0023] Stiffness Enhancement Structure 300, Stator Connecting Portion 310, First Through-Hole 311, Rotor Connecting Portion 320, Second Through-Hole 321, Reinforcing Rib Plate 330. Specific Embodiment

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0026] High-power shaftless generators are usually integrated with gearboxes to form the current mainstream technical route for semi-direct drive wind turbine units. Semi-direct drive wind turbines mostly adopt a coaxial system with the gearbox. When conducting factory tests on the generator, it is often necessary to design a tooling to assemble the stator 100 and the rotor 200 together for the factory test. Usually, the generator stator 100 and the hollow shaft 10 are connected to the test tooling, and the test tooling is then partially connected to the generator rotor 200, and then the stator 100 and the rotor 200 of the semi-direct drive wind turbine are assembled together for the factory test. The motor body of the semi-direct drive wind turbine is a shaftless structure, its stator 100 is a fixed end, while the rotor 200 is not fixed and is in an extended cantilever structure, that is, the rotor 200 is connected to the hollow shaft 10 of the gearbox through the motor rotor connecting flange 210. The hollow shaft 10 includes an inner shaft and an outer shaft, and there is a bearing between the inner shaft and the outer shaft to play a connecting role. The rotor 200 is fixedly connected to the inner shaft of the hollow shaft 10. When the rotor 200 rotates, the above-mentioned inner shaft rotates synchronously, while the outer shaft of the hollow shaft 10 is fixed. There is an air gap 20 between the stator 100 and the rotor 200. When the rotor 200 rotates at a high speed, the high centrifugal force will cause the deformation of the rotor 200 to increase, and then cause the effective air gap 20 in the test process of the generator to decrease.

[0027] In order to maintain the air gap 20 between the stator 100 and the rotor 200 and prevent the stator 100 from rubbing against the rotor 200, in the first embodiment of a semi-direct drive wind turbine of the present application, a semi-direct drive wind turbine is provided, which includes a stator 100 and a rotor 200, and further includes a stiffness enhancing structure for maintaining the air gap 20 between the stator 100 and the rotor 200; the stiffness enhancing structure has a stator connection portion 310, a rotor connection portion 320, and a reinforcing rib plate 330. Among them, the stator connection portion 310 is connected to the stator 100, the rotor connection portion 320 is connected to the rotor 200, and the reinforcing rib plate 330 is arranged between the stator connection portion 310 and the rotor connection portion 320 to enhance the stiffness of the rotor 200.

[0028] It should be noted that, with reference to Figure 1 and Figure 2 , based on the existing semi-direct drive wind turbine, the rotor 200 is connected to the hollow shaft 10 of the gearbox through the motor rotor connection flange 210. A semi-direct drive wind turbine according to an embodiment of the present application further includes a stiffness enhancing structure that connects the stator 100 and the rotor 200 to enhance the stiffness of the rotor 200. The stiffness enhancing structure has a stator connection portion 310, a rotor connection portion 320, and a reinforcing rib plate 330; among them, the stator connection portion 310 is connected to the stator; the rotor connection portion 320 is connected to the rotor 200 by connecting the motor rotor connection flange 210, and the rotor connection portion 320 directly acts on the outer shaft of the hollow shaft 10 at the rotor 200 to support the rotor 200; the reinforcing rib plate 330 is arranged between the stator connection portion 310 and the rotor connection portion 320. The stator connection portion 310 may specifically be a flange structure with through holes and is connected in cooperation with the corresponding structure of the stator 100; the rotor connection portion 320 may be a flange structure with through holes and is connected in cooperation with the corresponding structure of the rotor 200. It should be noted that the connection method between the stator connection portion 310 and the stator 100, and / or the connection method between the rotor connection portion 320 and the rotor 200 may also be connected by other fasteners.

[0029] Exemplarily, such as Figure 1 and Figure 2As shown, the stator connection part 310 and the rotor connection part 320 of the enhanced stiffness structure are directly connected. Both the stator connection part 310 and the rotor connection part 320 are arc-shaped flange structures, and the arc of the arc-shaped flange structure is coaxial with the stator 100 and the rotor 200. The reinforcing rib plate 330 is located between the stator connection part 310 and the rotor connection part 320. The side of the reinforcing rib plate 330 connected to the stator connection part 310 is arc-shaped, the side of the reinforcing rib plate 330 connected to the rotor connection part 320 is arc-shaped, and the reinforcing rib plate 330 includes a connecting rib plate connecting the stator connection part 310 and the rotor connection part 320, as well as reinforcing ribs. In another feasible implementation manner, the connecting rib can be replaced by a connecting plate.

[0030] In this embodiment, the semi-direct drive wind turbine includes an enhanced stiffness structure. One end of the enhanced stiffness structure is connected to the stator 100, the other end is connected to the rotor 200, and it includes a reinforcing rib plate 330, thereby enhancing the stiffness of the rotor 200 of the semi-direct drive wind turbine and maintaining the air gap 20 between the stator 100 and the rotor 200 of the semi-direct drive wind turbine to avoid rubbing between the stator 100 and the rotor 200.

[0031] Furthermore, the stator connection part 310 has a first through hole 311, and the first through hole 311 is used for bolt connection in cooperation with the stator 100.

[0032] In this embodiment, as Figure 1 shown, the stator connection part 310 has a stator connection surface connected to the stator 100. The stator connection surface has a first through hole 311, and the stator 100 also has a through hole or threaded hole corresponding to the first through hole 311. The connection mode of the enhanced stiffness structure and the stator 100 is bolt connection.

[0033] Furthermore, the stator connection part 310 is an arc-shaped flange structure or a circular flange structure.

[0034] In this embodiment, the stator connection part 310 can specifically be an arc-shaped flange structure as Figure 1 shown, or a circular flange structure, and has the first through hole 311 as described above. Adopting the arc-shaped flange structure can reduce the self-weight of the semi-direct drive wind turbine. The arc radius and radian range of the arc-shaped flange structure are selected according to the weight of the rotor 200. In a feasible implementation manner, the stator connection part 310 can also be a straight flange structure or other special-shaped flange structures.

[0035] Based on the first embodiment of a semi-direct drive wind turbine of the present application above, a second embodiment of the present application is proposed. The main difference between this embodiment and the above first embodiment is that in this embodiment, a semi-direct drive wind turbine of the present application further includes an end cover 110. The end cover 110 is circular and is coaxially arranged with and fixedly connected to the stator 100.

[0036] It should be noted that, with reference to Figure 1 and Figure 2 , the end cover 110 is annular and is arranged on the hollow shaft 10. The inner ring of the end cover 110 is connected to the hollow shaft 10, and the outer ring of the end cover 110 is connected to the stator 100. Specifically, through holes 111 of the end cover as shown in Figure 1 are provided on the outer ring of the end cover 110 for connecting with the stator 100.

[0037] Furthermore, the enhanced stiffness structure is connected to the stator 100 by connecting the end cover 110.

[0038] In this embodiment, the semi-direct drive wind turbine further includes the end cover 110 as described above. The enhanced stiffness structure is directly connected to the end cover 110. The end cover 110 has a through hole or threaded hole that cooperates with the first through hole 311 of the stator connection portion 310. The enhanced stiffness structure is bolted to the end cover 110. Since the end cover 110 is fixedly connected to the stator 100 and the other end is connected to the rotor 200, the enhanced stiffness structure has the function of enhancing the stiffness of the rotor 200 and maintaining the air gap 20 between the stator 100 and the rotor 200.

[0039] Furthermore, the end cover 110 is made of carbon steel.

[0040] In this embodiment, the semi-direct drive wind turbine further includes an end cover 110 connected to the stator 100. The stator connection portion 310 of the enhanced stiffness structure is connected to the stator 100 by connecting with the end cover 110, and the rotor connection portion 320 of the enhanced stiffness structure is connected to the rotor 200. The end cover 110 may specifically be made of carbon steel. Therefore, the enhanced stiffness structure has the function of enhancing the stiffness of the rotor 200 and maintaining the air gap 20 between the stator 100 and the rotor 200, thereby effectively avoiding rubbing between the stator 100 and the rotor 200.

[0041] Based on the first embodiment and / or the second embodiment of a semi-direct drive wind turbine of the present application as described above, a third embodiment of the present application is proposed. The main difference between this embodiment and the above first embodiment is that, in this embodiment, the rotor connection portion 320 has a second through hole 321, and the second through hole 321 is used for bolt connection with the rotor 200.

[0042] It should be noted that, as Figure 1As shown, the rotor connection part 320 has a rotor 200 connection surface connected to the rotor 200. The rotor 200 connection surface has a second through hole 321. The motor rotor 200 connection flange 210 where the rotor 200 is connected to the hollow shaft 10 also has a through hole or threaded hole corresponding to the second through hole 321. The connection mode of the enhanced stiffness structure to the rotor 200 is bolt connection.

[0043] Furthermore, the rotor connection part 320 is an arc-shaped flange structure or a circular flange structure.

[0044] In this embodiment, the rotor connection part 320 may specifically be Figure 1 the arc-shaped flange structure shown, or a circular flange structure, and has the second through hole 321 as described above. Adopting the arc-shaped flange structure can reduce the self-weight of the semi-direct drive wind turbine. The arc radius and radian range of this arc-shaped flange structure are selected according to the weight of the rotor 200.

[0045] Furthermore, the enhanced stiffness structure is made of carbon steel.

[0046] In this embodiment, the rotor connection part 320 has a second through hole 321 and may specifically be a flange structure. The enhanced stiffness structure is connected to the rotor 200, and the other end is connected to the stator 100. In this way, the stiffness of the rotor 200 of the semi-direct drive wind turbine can be improved, effectively maintaining the air gap 20 between the stator 100 and the rotor 200, thereby reducing the risk of rubbing between the stator and the rotor 200.

[0047] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0048] Although the embodiments of the present application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A semi-direct drive wind turbine generator, comprising a stator and a rotor, characterized in that: Also included is a stiffness enhancement structure for maintaining an air gap between the stator and the rotor; The stiffness enhancement structure comprises a stator connection part, a rotor connection part and a stiffening rib plate, wherein the stator connection part is connected to the stator, the rotor connection part is connected to the rotor, and the stiffening rib plate is arranged between the stator connection part and the rotor connection part to enhance the stiffness of the rotor.

2. The semi-direct drive wind turbine according to claim 1, characterized in that: The stator connecting portion has a first through hole, and the first through hole is used to cooperate with the stator for bolt connection.

3. The semi-direct drive wind turbine according to claim 2, characterized in that: The stator connecting portion is an arc-shaped flange structure or an annular flange structure.

4. The semi-direct drive wind turbine according to claim 1, characterized in that: The semi-direct-drive wind turbine generator further comprises an end cover, which is in a circular ring shape and is coaxially arranged with the stator and is tightly connected.

5. The semi-direct drive wind turbine according to claim 4, characterized in that: The stiffness enhancing structure is connected to the stator by connecting the end cover.

6. The semi-direct drive wind turbine according to claim 4 or 5, characterized in that: The end cover is made of carbon steel.

7. The semi-direct drive wind turbine generator according to claim 1, characterized in that: The rotor connecting portion has a second through hole, and the second through hole is used to cooperate with the rotor for bolt connection.

8. The semi-direct drive wind turbine according to claim 7, characterized in that: The rotor connection portion is an arc-shaped flange structure or an annular flange structure.

9. The semi-direct drive wind turbine according to any one of claims 1 to 8, characterized in that: The enhanced rigidity structure is made of carbon steel.

Images