Fixed shaft of generator and wind turbine generator including the same

Abstract

The present invention discloses a fixed shaft of a generator and a wind turbine generator including the same, which includes a shaft body and an intermediate flange arranged on the outer wall of the shaft body, the intermediate flange is used to connect a stator support, and a fixing portion is arranged at one end of the intermediate flange away from the shaft body, at least one end of the fixing portion protrudes from the surface of the intermediate flange along the axial direction of the fixed shaft and extends toward the end direction of the shaft body, and the stator support abuts against and is connected to the fixing portion. The fixed shaft of the generator provided by the present invention and the wind turbine generator including the same provide a support platform for fixing with the stator support by arranging a fixing portion at the end of the intermediate flange of the fixed shaft, the support platform protrudes from the intermediate flange along the axial direction, strengthens the structural rigidity of the connection end between the intermediate flange and the stator support, and also provides a larger area for fixing the stator support, so that the fixing effect of the stator support is guaranteed while the supporting effect is better.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and in particular to a fixed shaft of a generator and a wind power generator comprising the fixed shaft. Background Art

[0002] For direct-drive wind turbines, there are generally two ways to set up the bearing structure: a single large bearing structure directly drives the generator and two small bearings support the structure generator. The large bearing structure is mainly supported by a larger main bearing, and the wind turbine rotor load is transmitted from the main bearing to the fixed shaft. The structure supported by two small bearings is one set between the front end of the rotating shaft and the front end of the fixed shaft, and the other set between the rear end of the rotating shaft and the fixed shaft. Compared with a single large bearing, the two small bearings support method distributes the load to two bearings, so that the two bearings share the load, so the cost of the bearing is lower, which is conducive to the control of production costs.

[0003] However, since the generator is supported by two small bearings, the size of the generator fixed shaft that matches the bearings is small, resulting in low rigidity of the fixed shaft. Especially for the middle flange of the fixed shaft where the stator support is installed, since it needs to support the stator on the outer ring, higher requirements are placed on the structural rigidity of this part. The usual stator support supports the stator through a bracket that extends along the middle flange to the inside of the stator. In order to enhance the supporting effect, a reinforcing rib structure is used on both sides of the middle flange. However, the reinforcing ribs are more effective in strengthening the axial rigidity of the middle flange, but the reinforcing effect on the torsional rigidity of the middle flange is not ideal, resulting in that its overall structural rigidity cannot be fully guaranteed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of poor structural strength, rigidity and fixing effect of the fixed shaft of the wind turbine in the prior art which is fixed by stator support, and to provide a fixed shaft of the generator and a wind turbine including the same.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A fixed shaft of a generator, comprising a shaft body and an intermediate flange arranged on the outer side wall of the shaft body, wherein the intermediate flange is used to connect a stator support, and is characterized in that a fixing portion is arranged at one end of the intermediate flange away from the shaft body, at least one end of the fixing portion protrudes from the surface of the intermediate flange along the axial direction of the fixed shaft and extends toward the end direction of the shaft body, and the stator support abuts against and is connected to the fixing portion.

[0007] In the present solution, a fixing portion is provided at the end of the middle flange of the fixed shaft, thereby providing a support platform for fixing to the stator support, and the support platform protrudes from the surface of the middle flange in the axial direction, and supports and is connected to the middle flange, that is, through the fixing portion structure, while ensuring the axial stiffness, the torsional stiffness is also enhanced, thereby enhancing the structural stiffness of the connecting end between the middle flange and the stator support, and the fixing portion also provides a larger area for fixing the stator support than the end face of the middle flange away from the fixed shaft, thereby ensuring the fixing effect of the stator support while also improving the supporting effect.

[0008] Preferably, the fixing part is arranged along the circumference of the shaft body, and the fixing part forms a cylindrical structure coaxial with the shaft body. The fixing part is arranged as a cylindrical structure coaxial with the fixed shaft, that is, also coaxial with the stator. For the stator support, since the two are arranged in parallel with each other, the support effect is more stable, and the fixed shaft is arranged along the axial direction of the shaft body, so that the stress distribution on the flange is also more uniform, which is conducive to ensuring the structural rigidity.

[0009] Preferably, one end of the fixing portion has a plurality of first connection openings arranged along the circumference of the fixing portion, and the fixing portion and the stator support are fixedly connected by a bolt assembly passing through one end of the stator support and the first connection openings. The fixing portion and the stator support are connected by the bolt assembly, which is convenient and fast.

[0010] Preferably, the length of the fixing portion along the axial direction is not less than 1.5 times the thickness of the intermediate flange along the axial direction, so as to ensure that the fixing portion has sufficient strength and supporting effect.

[0011] Preferably, a plurality of first reinforcement members are arranged between the fixed shaft and the intermediate flange, and the first reinforcement members are arranged along the circumference of the fixed portion. The provision of the first reinforcement members can further improve the rigidity of the fixed portion and the intermediate flange.

[0012] Preferably, a connecting flange is provided at one end of the stator support connected to the fixing portion, the cross-sectional shape of the connecting flange along the axial direction is "L"-shaped, the first bent edge of the connecting flange abuts against a side surface of the fixing portion away from the shaft body, and the second bent edge of the connecting flange abuts against and is connected to one end of the fixing portion. Arranging the connecting flange of the stator support connected to the fixing portion to have a structural form with an "L"-shaped cross-section can achieve a better coordination effect between the stator support and the fixing portion.

[0013] Preferably, the surface of the second bent edge has a first corresponding hole, the first corresponding hole is arranged relatively to the position of the first connecting opening, and the bolt assembly passes through the first corresponding hole and the first connecting opening at the same time. The fixing part and the stator support are connected by the bolt assembly, which is convenient and fast.

[0014] Preferably, the end of the first bent edge away from the second bent edge has a second corresponding hole, and the second corresponding hole is used to connect with the connecting ring of the fixed shaft. The two ends of the connecting flange are respectively connected to the fixing part and the connecting ring, so that the connection effect between the stator support and the fixing part is better, and the stator support structure is more stable during operation.

[0015] Preferably, the stator support comprises a front end plate, a rear end plate and a support ring, wherein the front end plate, the support ring, the rear end plate and the connecting flange of the stator support are connected end to end in sequence to form the stator support, and the stator support ring is arranged on the outer ring of the fixing portion. The stator support is formed into a whole by four structures connected end to end, and the rigidity of the structure is greatly improved compared with the method of supporting with only one bracket.

[0016] Preferably, the two ends of the connecting flange of the stator support along the axial direction are respectively connected to the front end plate and the rear end plate, and the interior of the stator support is enclosed to form a cavity. The four structures of the stator support are enclosed to form a cavity inside the stator support, which is convenient for arranging components such as a cooler and improving the space utilization of the structure.

[0017] Preferably, the stator support further includes a second reinforcement member, which is disposed in the cavity, and at least two sides of the second reinforcement member are connected to the inner wall of the cavity to further improve the rigidity of the stator support.

[0018] Preferably, the fixed shaft further comprises a third reinforcement member, one end of the shaft body has a rear end flange, and both ends of the third reinforcement member are respectively connected to the rear end flange and the middle flange. The third reinforcement member supports the middle flange at its rear side to further ensure the supporting effect, and is also connected to the rear end flange, so that the overall rigidity of the entire fixed shaft structure is improved, which not only improves the rigidity of the middle flange, but also improves the rigidity of the rear end flange.

[0019] Preferably, a reinforcement chamber is formed between the third reinforcement member and the shaft body, and the reinforcement chamber extends along the circumference of the shaft body. The existence of the reinforcement chamber improves the torsional rigidity of the fixed shaft and further strengthens the bending rigidity.

[0020] Preferably, the third reinforcement member forms an annular structure, and the diameter of the annular structure is not less than 60% of the outer ring diameter of the middle flange to ensure sufficient reinforcement effect.

[0021] A wind turbine generator comprises a rotor, a stator, a rotating shaft and a bearing assembly, wherein the wind turbine generator further comprises the fixed shaft as described above, the rotating shaft is located on the outer ring of the fixed shaft, and the bearing assembly is arranged between the fixed shaft and the rotating shaft.

[0022] Preferably, the wind turbine further comprises a connecting ring, one end of the fixing part is connected to the stator support, the connecting ring is arranged at the other end of the fixing part, one end of the connecting ring is connected to the other end of the fixing part, and the other end of the connecting ring is connected to the stator support. A connecting ring is added at the other end of the fixing part to connect the other end of the fixing part and the stator support, so that the connection stiffness between the stator support and the intermediate flange of the fixing shaft is further improved.

[0023] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0024] The positive and progressive effects of the present invention are:

[0025] The fixed shaft of the generator and the wind turbine generator including the same provided by the present invention provide a fixing portion at the end of the middle flange of the fixed shaft, thereby providing a support platform for fixing to the stator support, and the two ends of the support platform along the axial direction protrude from the surface of the middle flange, and the middle part supports and is connected to the middle flange, that is, through the fixing portion structure, while ensuring the axial stiffness, the torsional stiffness is also enhanced, thereby strengthening the structural stiffness of the connecting end of the middle flange and the stator support, and the fixing portion also provides a larger area for fixing the stator support than the end face of the middle flange away from the fixed shaft, thereby ensuring the fixing effect of the stator support while also improving the supporting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional schematic diagram of a partial structure of a wind turbine according to a preferred embodiment of the present invention.

[0027] Figure 2 The figure is a schematic cross-sectional structure diagram of one axial side of a wind turbine according to a preferred embodiment of the present invention.

[0028] Figure 3 for Figure 2 Schematic diagram of the local structure of part A.

[0029] Figure 4 It is a cross-sectional schematic diagram of a partial structure of a wind turbine according to a preferred embodiment of the present invention.

[0030] Figure 5 It is a schematic cross-sectional structure diagram of a stator support according to a preferred embodiment of the present invention.

[0031] Description of reference numerals:

[0032] Fixed axis 1

[0033] Axis 11

[0034] Intermediate flange 12

[0035] Fixing part 13

[0036] First connection opening 131

[0037] Connecting ring 14

[0038] External through hole 141

[0039] Inner through hole 142

[0040] First reinforcement member 15

[0041] The third reinforcement member 16

[0042] Rear flange 17

[0043] Stator support 2

[0044] Connecting flange 21

[0045] First corresponding hole 211

[0046] The second corresponding hole 212

[0047] Front end plate 22

[0048] Rear end plate 23

[0049] Support ring 24

[0050] Second reinforcement member 25

[0051] Rotor 3

[0052] Stator 4

[0053] Reel 5

[0054] Wind wheel side bearing 61

[0055] Nacelle side bearing 62 DETAILED DESCRIPTION

[0056] The present invention will be described more clearly and completely below by way of a preferred embodiment in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiment.

[0057] like Figure 1-5As shown, this embodiment provides a fixed shaft of a generator and a wind turbine generator including the same, wherein the fixed shaft 1 comprises a shaft body 11 and an intermediate flange 12 disposed on the outer wall of the shaft body 11, and the intermediate flange 12 is used to connect the stator support 2. A fixing portion 13 is disposed at one end of the intermediate flange 12 away from the shaft body 11, and at least one end of the fixing portion 13 protrudes from the surface of the intermediate flange 12 along the axial direction of the fixed shaft 1 and extends toward the end direction of the shaft body 11, and the stator support 2 abuts against and is connected to the fixing portion 13.

[0058] A fixing portion 13 is provided at the end of the intermediate flange 12 of the fixed shaft 1, thereby providing a support platform for fixing to the stator support 2, and the support platform protrudes from the surface of the intermediate flange 12 in the axial direction, and supports and is connected to the intermediate flange 12, that is, through the structure of the fixing portion 13, the torsional stiffness is enhanced while ensuring the axial stiffness, thereby enhancing the structural stiffness of the connection end between the intermediate flange 12 and the stator support 2, and the fixing portion 13 also provides a larger area for fixing the stator support 2 than the end face of the intermediate flange 12 away from the fixed shaft 1, thereby ensuring the fixing effect of the stator support 2 while also improving the supporting effect.

[0059] In this embodiment, the fixing portion 13 is arranged to extend toward both ends of the fixed shaft 1, that is, the middle portion of the fixed shaft 1 is fixed to one end of the intermediate flange 12, forming a larger support platform protruding from the surfaces of both sides of the intermediate flange 12. Of course, in other embodiments, the fixing portion 13 can also be arranged to extend only toward one end of the fixed shaft 1. Preferably, the fixing portion 13 is arranged along the circumference of the shaft body 11, and forms a cylindrical structure coaxial with the shaft body 11. The fixing portion 13 of the cylindrical structure is coaxial with the stator 4, and the support effect is more stable for the stator support 2. The fixed shaft 1 is arranged along the axial direction of the shaft body 11, so that the stress distribution on the flange is also more uniform, which is conducive to the guarantee of structural rigidity. Through the above arrangement, the fixing portion 13 and the intermediate flange 12 form a T-shaped structure, which strengthens the rigidity of the intermediate flange 12 of the fixed shaft 1 and increases the matching length between the stator support 2 and the intermediate flange 12 of the fixed shaft 1.

[0060] Preferably, in this embodiment, the length of the fixing portion 13 along the axial direction is not less than 1.5 times the thickness of the intermediate flange 12 along the axial direction, so as to ensure that the fixing portion 13 has sufficient strength and supporting effect. Of course, in other embodiments, other size specifications can also be set as long as the fixing effect of the fixing portion 13 is not affected.

[0061] In addition, in order to further improve the rigidity of the fixing portion 13 and the intermediate flange 12, a plurality of first reinforcing members 15 may be provided between the fixing shaft 1 and the intermediate flange 12, so that the first reinforcing members 15 are arranged along the circumference of the fixing portion 13. In this embodiment, the first reinforcing member 15 is a reinforcing rib structure, or other reinforcing structures equivalent to the reinforcing rib effect. In other embodiments, no reinforcing member may be provided, and the load may be directly borne by the intermediate flange 12, as long as the rigidity of the intermediate flange 12 is ensured to be sufficient.

[0062] Further, one end of the fixing portion 13 has a plurality of first connection openings 131 arranged along the circumference of the fixing portion 13, and the fixing portion 13 and the stator support 2 are fixedly connected by a bolt assembly passing through one end of the stator support 2 and the first connection openings 131. The fixing portion 13 and the stator support 2 are connected by the bolt assembly, which is convenient and fast.

[0063] In order to ensure a better connection and fixing effect, the wind turbine in this embodiment also includes a connecting ring 14, which is arranged at the other end of the fixing part 13, one end of the connecting ring 14 is connected to the other end of the fixing part 13, and the other end of the connecting ring 14 is connected to the stator support 2. A connecting ring 14 is added at the other end of the fixing part 13 to connect the other end of the fixing part 13 and the stator support 2, which is equivalent to connecting the fixing part 13 and the stator support 2 from both sides, thereby further improving the connection stiffness between the stator support 2 and the middle flange 12 of the fixed shaft 1. In other embodiments, the connecting ring 14 structure may not be provided.

[0064] As for the connection structure between the stator support 2 and the fixing part 13, a connection flange 21 is provided at one end of the stator support 2 connected to the fixing part 13, and the connection is made with the fixing part 13 through the connection flange 21. Preferably, the cross-sectional shape of the connection flange 21 along the axial direction is "L"-shaped, the first bent edge of the "L"-shaped connection flange 21 abuts against the side surface of the fixing part 13 away from the shaft body 11, and the second bent edge of the connection flange 21 abuts against one end of the fixing part 13 and is connected to the one end of the fixing part 13. Setting the connection flange 21 of the stator support 2 connected to the fixing part 13 in a structural form with an "L"-shaped cross section can make the stator support 2 and the fixing part 13 cooperate better.

[0065] Correspondingly, the connection position between the fixing portion 13 and the stator support 2 is located on the second bending edge. Specifically, the surface of the second bending edge has a first corresponding hole 211, and the first corresponding hole 211 is arranged relatively to the position of the first connecting opening 131, and the bolt assembly passes through the first corresponding hole 211 and the first connecting opening 131 at the same time.

[0066] Under the setting of strengthening connection through the connecting ring 14, the end of the first bent edge away from the second bent edge has a second corresponding hole 212 corresponding to the strengthening ring, and the second corresponding hole 212 is used to connect with the connecting ring 14 of the fixed shaft 1. The two ends of the connecting flange 21 are respectively connected to the fixing part 13 and the connecting ring 14, so that the connection effect between the stator support 2 and the fixing part 13 is better, and the structure of the stator support 2 is more stable during operation.

[0067] In this embodiment, the surface of the connecting ring 14 is provided with an outer through hole 141 and an inner through hole 142 corresponding to the fixing portion 13 and the connecting flange 21 respectively. The outer through hole 141 is used to connect to one end of the first bent edge of the connecting flange 21, and the inner through hole 142 is used to connect to the other end of the fixing portion 13, and both are further fixed by a bolt assembly.

[0068] In addition, for the structure of the stator support 2, it includes a front end plate 22, a rear end plate 23 and a support ring 24. The front end plate 22, the support ring 24, the rear end plate 23 and the connecting flange 21 of the stator support 2 are connected end to end in sequence to form the stator support 2. The stator support 2 is arranged around the outer ring of the fixing portion 13. The stator support 2 is formed into a whole by four structures connected end to end. Compared with the method of supporting with only one bracket, the rigidity of the structure is greatly improved. Preferably, the two ends of the connecting flange 21 of the stator support 2 along the axial direction are respectively connected to the front end plate 22 and the rear end plate 23, and the interior of the stator support 2 is enclosed to form a cavity. The four structures of the stator support 2 are enclosed, and a cavity can be formed inside the stator support 2, which is convenient for arranging components such as a cooler, and improves the space utilization of the structure.

[0069] Since the structure of the fixing portion 13 is matched with the middle flange 12 of the fixing shaft 1, the fixing portion 13 is smaller in structure than the supporting ring 24 of the stator support 2. Therefore, the stator support 2 formed by the front end plate 22, the rear end plate 23, the supporting ring 24 and the connecting flange 21 can have a cross section in the radial direction in an inverted trapezoidal shape, and the rigidity is greatly improved compared with the existing stator support 2 which is basically T-shaped.

[0070] Furthermore, the stator support 2 further includes a second reinforcement member 25, which is disposed in the cavity, and at least two sides of the second reinforcement member 25 are connected to the inner side wall of the cavity, so as to further improve the rigidity of the stator support 2. In this embodiment, the second reinforcement member 25 also adopts a reinforcing rib structure, or other reinforcing structures equivalent to the reinforcing rib effect. In other embodiments, the second reinforcement member 25 may not be provided, as long as the rigidity of the stator support 2 is ensured to be sufficient.

[0071] A rear end flange 17 is also provided on one side of the shaft body 11 of the fixed shaft 1 of the generator. On this basis, the fixed shaft 1 structure also includes a third reinforcement member 16, and the two ends of the third reinforcement member 16 are respectively connected to the rear end flange 17 and the middle flange 12. The rear end flange 17 of the fixed shaft 1 is used to connect with the nacelle frame of the wind turbine to support the entire direct-drive wind turbine. The third reinforcement member 16 supports the middle flange 12 at the rear side to further ensure the supporting effect, and is also connected to the rear end flange 17, so that the overall rigidity of the entire fixed shaft 1 structure is improved, which not only improves the rigidity of the middle flange 12, but also improves the rigidity of the rear end flange 17. Furthermore, a reinforcement chamber is formed between the third reinforcement member 16 and the shaft body 11, and the reinforcement chamber extends along the circumference of the shaft body 11.

[0072] The existence of the reinforcement chamber improves the torsional rigidity of the fixed shaft 1, and the bending rigidity can also be further enhanced. Preferably, the third reinforcement member 16 is a reinforcement ring, which is arranged around the outer ring of the shaft body 11, and the above-mentioned reinforcement chamber is formed by the space between the reinforcement ring and the surface of the shaft body 11. Compared with the method of only arranging reinforcement ribs, it is more effective in improving the rigidity of the flange structure of the fixed shaft 1. In this embodiment, a reinforcement rib structure is also arranged inside the reinforcement chamber to further improve the overall rigidity. Of course, in other embodiments, only a reinforcement chamber may be provided.

[0073] In addition, in this embodiment, the diameter of the annular structure formed by the third reinforcement member 16 is not less than 60% of the outer diameter of the middle flange 12 to ensure sufficient reinforcement effect. Of course, in other embodiments, the third reinforcement member 16 can also be set to other size specifications.

[0074] This embodiment also provides a wind turbine generator, which includes a rotor 3, a stator 4, a rotating shaft 5 and a bearing assembly, and further includes the above-mentioned fixed shaft 1. The rotating shaft 5 is located on the outer ring of the fixed shaft 1, and the bearing assembly is arranged between the fixed shaft 1 and the rotating shaft 5. The bearing assembly includes a wind wheel side bearing 61 and a nacelle side bearing 62. The front end and the rear end of the fixed shaft 1 are respectively arranged with the wind wheel side bearing 61 and the nacelle side bearing 62. The inner rings of the two bearings are matched with the fixed shaft 1, and the outer rings of the two bearings are matched with the rotating shaft 5. The flange of the rotating shaft 5 is connected to the flange of the rotor 3. When the wind turbine generator is running, the wind wheel can drive the rotating shaft 5 and the rotor 3 to rotate together.

[0075] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A fixed shaft of a generator, comprising a shaft body and an intermediate flange arranged on the outer side wall of the shaft body, wherein the intermediate flange is used to connect a stator support, It is characterized in that A fixing portion is provided at one end of the intermediate flange away from the shaft body, at least one end of the fixing portion protrudes from the surface of the intermediate flange along the axial direction of the fixed shaft and extends toward the end direction of the shaft body, and the stator support abuts against and is connected to the fixing portion; The fixing portion is arranged along the circumference of the shaft body, and the fixing portion forms a cylindrical structure coaxial with the shaft body; One end of the fixing portion has a plurality of first connection openings arranged along the circumference of the fixing portion, and the fixing portion and the stator support are fixedly connected by a bolt assembly passing through one end of the stator support and the first connection openings.

2. The fixed shaft of the generator according to claim 1, It is characterized in that The length of the fixing portion along the axial direction is not less than 1.5 times the thickness of the intermediate flange along the axial direction.

3. The fixed shaft of the generator according to claim 1, It is characterized in that A plurality of first reinforcement members are arranged between the fixed shaft and the middle flange, and the first reinforcement members are arranged along the circumference of the fixed portion.

4. The fixed shaft of the generator according to claim 1, It is characterized in that A connecting flange is provided at one end of the stator support connected to the fixed part, and the cross-sectional shape of the connecting flange along the axial direction is "L"-shaped. The first bent edge of the connecting flange abuts against the side surface of the fixed part away from the shaft body, and the second bent edge of the connecting flange abuts against and is connected to one end of the fixed part.

5. The fixed shaft of the generator according to claim 4, It is characterized in that The surface of the second bent edge has a first corresponding hole, and the first corresponding hole is relatively arranged at a position corresponding to the first connecting opening, and the bolt assembly passes through the first corresponding hole and the first connecting opening at the same time.

6. The fixed shaft of the generator according to claim 4, It is characterized in that An end of the first bending edge away from the second bending edge has a second corresponding hole, and the second corresponding hole is used to be connected to the connecting ring of the fixed shaft.

7. The fixed shaft of the generator according to claim 1, It is characterized in that The stator support comprises a front end plate, a rear end plate and a support ring. The front end plate, the support ring, the rear end plate and the connecting flange of the stator support are connected end to end in sequence to form the stator support. The stator support ring is arranged on the outer ring of the fixing part.

8. The fixed shaft of the generator according to claim 7, It is characterized in that Two ends of the connecting flange of the stator support along the axial direction are respectively connected to the front end plate and the rear end plate, and the interior of the stator support is surrounded to form a cavity.

9. The fixed shaft of the generator according to claim 8, It is characterized in that The stator support further includes a second reinforcement member, which is disposed in the cavity, and at least two sides of the second reinforcement member are connected to an inner side wall of the cavity.

10. The fixed shaft of the generator according to claim 1, It is characterized in that The fixed shaft further includes a third reinforcement member, one end of the shaft body has a rear end flange, and both ends of the third reinforcement member are respectively connected to the rear end flange and the middle flange.

11. The fixed shaft of the generator according to claim 10, It is characterized in that A reinforcement chamber is formed between the third reinforcement member and the shaft body, and the reinforcement chamber extends along the circumference of the shaft body.

12. The fixed shaft of the generator according to claim 11, It is characterized in that The third reinforcement member forms an annular structure, and the diameter of the annular structure is not less than 60% of the outer ring diameter of the middle flange.

13. A wind turbine generator comprising a rotor, a stator, a rotating shaft and a bearing assembly, It is characterized in that The wind turbine further comprises a fixed shaft as claimed in any one of claims 1 to 12, the rotating shaft is located on an outer ring of the fixed shaft, and the bearing assembly is disposed between the fixed shaft and the rotating shaft.

14. The wind turbine according to claim 13, It is characterized in that The wind turbine further comprises a connecting ring, one end of the fixing portion is connected to the stator support, the connecting ring is arranged at the other end of the fixing portion, one end of the connecting ring is connected to the other end of the fixing portion, and the other end of the connecting ring is connected to the stator support.

Images