TWI404860B - Wind-power generator and maintenance method thereof - Google Patents

Abstract

A wind-power generator is provided with a main shaft supporting a turbine rotor, a main bearing rotatably supporting the main shaft, a power generator including a generator rotor and a stator, and a sleeve connected to the generator rotor and inserted onto the main shaft. The stator includes stator magnetic poles arrayed in the circumferential direction of the main shaft, and first and second stator plates relatively rotatably connected to the main shaft to support the stator magnetic poles and arrayed in the axial direction of the main shaft. The generator rotor includes rotor magnetic poles arrayed in the circumferential direction, and at least one rotor magnetic pole supporting structure connected to support the rotor magnetic poles and disposed between the first and second stator plates. The first and second stator plates and the rotor magnetic poles supporting structure are structured to allow the rotor and stator magnetic poles to be detached from the sleeve. The positions where the rotor and stator magnetic poles are detached within the first and second stator plates and the rotor magnetic pole supporting structure are positioned closer to the main shaft as the distance is reduced from the end of the shaft on the side of the power generator.

Description

Wind power generation device and maintenance method thereof

The present invention relates to a wind power plant, and more particularly to a configuration of a generator in a wind power plant.

Regarding the coupling structure of the main shaft and the generator rotor in the wind power generator, a conventional structure is a structure in which a generator rotor is coupled to a cylindrical sleeve, and the sleeve is locked and fixed to the main shaft. Such a configuration is disclosed, for example, in Japanese Laid-Open Patent Publication No. WO2007/111425A1 (Patent Document 1). Patent Document 1 discloses a joint structure in which a rotor bearing (corresponding to a sleeve of the present invention) to which a generator rotor has been joined is locked and fixed to a main shaft by using a shrink disk (corresponding to a shrink jig in the present case) . In this combined configuration, the shrink disk is tethered between the generator and the bearing where the rotor bearing is locked and secured to the main shaft. The shrink disk is composed of a fixed disk and a movable disk, and the fixed disk and the movable disk are coupled by bolts. The bolt is inserted in a direction parallel to the central axis of the spindle. When the bolt is locked, the movable disc is pushed toward the fixed disc to narrow the inner diameter of the shrink disc, and the rotor bearing is fixed to the main shaft.

One of the problems of locking the sleeve to the construction of the main shaft is the difficulty in removing the sleeve from the main shaft or the work of inserting the sleeve into the main shaft. In order to ensure the strength of the locking fixation, the smaller the gap between the sleeve and the main shaft, the better. Based on this point of view, the gap between the sleeve and the main shaft is typically adjusted to the extent of 0.1 mm. However, if the gap between the sleeve and the main shaft is too small, it is difficult to remove the sleeve from the main shaft or to insert the sleeve into the main shaft.

This problem is particularly serious especially in the case where the generator has to be replaced after the wind power plant has been installed. After the wind power generator is set up, it is very difficult to perform the work of removing the sleeve from the main shaft or inserting the sleeve into the main shaft on the tower. For example, in the case of a 5 MW class wind power plant, the generator has a weight of more than 100 tons. In order to perform the replacement work on the tower of the wind power generator, it is necessary to use the crane to hang the generator while performing the replacement work. Therefore, it is necessary to use the crane to hang the heavy-duty generator while carrying the sleeve from the main shaft. It is extremely difficult to disassemble the cartridge or insert the sleeve into the spindle.

[Advanced technical literature]

[Patent Document 1] Japanese International Publication WO2007/111425 A1

Accordingly, it is an object of the present invention to provide a technique that makes it easier to replace a generator in a wind power generator.

In one aspect of the present invention, a wind turbine generator includes: a main shaft for supporting a wind turbine rotor, a main bearing for supporting a main shaft to be rotatable, a generator having a generator rotor and a stator, and coupled to the generator rotor A sleeve that is inserted into the spindle. The stator system includes stator magnetic poles arranged in the circumferential direction of the main shaft, and first and second stator plates that are arranged in the axial direction of the main shaft to support the stator magnetic poles, and are coupled to the main shaft so as to be rotatable relative to each other. The generator rotor system includes at least one rotor magnetic pole supporting structure provided between the first and second stator plates that is arranged in the circumferential direction and coupled to the main shaft to support the rotor magnetic poles. The first and second stator plates and the rotor magnetic pole support structure are configured to separate the rotor magnetic pole and the stator magnetic pole from the sleeve. In the first and second stator plates and the rotor magnetic pole support structure, the position at which the rotor magnetic pole and the stator magnetic pole are separated from the sleeve is set such that the closer the distance from the end portion of the main shaft to the generator is, the closer it is. On the spindle.

According to one embodiment, the first stator plate is located closer to the generator-side end of the main shaft than the second stator plate, and the first stator plate includes: a first plate member coupled to the sleeve, coupled to a second plate member that is detachable from the first plate member; the rotor magnetic pole support structure includes a first support member coupled to the sleeve, coupled to the rotor magnetic pole and detachable from the first support member The second support member includes a third plate member coupled to the sleeve, and a fourth plate member coupled to the stator magnetic pole and detachable from the third plate member. In this case, the end portion of the second plate member on the sleeve side is further away from the main shaft than the end portion of the first support member on the side of the rotor magnetic pole, and the second support member is a sleeve. The end portion of the side is preferably farther from the main shaft than the end portion of the third plate member on the side of the stator pole.

At least one of the first and second stator plates preferably has an opening at a position corresponding to a position at which the rotor magnetic pole is separated from the sleeve in the rotor magnetic pole support structure.

"At least one rotor magnetic pole support structure" means a rotor magnetic pole from a sleeve in each of a plurality of rotor magnetic pole support structures in a plurality of rotor magnetic pole support structures arranged in the axial direction of the main shaft The position of the separation is set such that the shorter the distance from the end of the main shaft, the closer it is to the main shaft.

In one embodiment of the present invention, the first stator plate and the rotor magnetic pole support structure are disposed to face each other, and each of the first stator plate and the rotor magnetic pole support structure is provided with a mounting structure, and the mounting structure is preferably It is used to mount a temporary fixture for temporarily fixing the first stator plate and the rotor pole support structure. In this case, the temporary fixture includes a wedge or a rod member, and the mounting structure may be an opening for the temporary fixture to be inserted.

When at least one of the first stator plate and the second stator plate is provided with an opening for maintenance work, the maintenance method of the wind power generator includes: performing a rotor magnetic pole support structure inside the protective tube Preferably, the step of joining between the first support member coupled to the sleeve and the second support member coupled to the rotor pole or the step of removing the second support member from the first support member is preferred.

According to the present invention, the replacement operation of the generator in the wind power generator can be made easier.

Fig. 1 is a view schematically showing the configuration of a wind power generator 1 according to an embodiment of the present invention. The wind power generator 1 of the present embodiment includes a tower 2, a nacelle plate 3, a main shaft 4, bearings 5 and 6, bearing blocks 7 and 8, and a generator 9. The nacelle seat plate 3 is steerably placed on the upper end of the tower 2 . The main shaft 4 is supported by two bearings 5 and 6 for rotation, and the bearings 5 and 6 are fixed to the nacelle base plate 3 by the bearing blocks 7 and 8. A wind turbine rotor (not shown) is coupled to one end of the main shaft 4, and a rotor coupled to the generator 9 is connected to the other end. In the wind power generator 1 of the present embodiment, the main shaft 4 is shared by the wind turbine rotor and the generator rotor, and the wind power generator 1 of the present embodiment is a "direct drive type wind power generator".

Fig. 2A is a cross-sectional view showing the structure of the wind power generator 1 according to an embodiment of the present invention, in particular, showing the structure of the generator 9. The generator 9 has a generator rotor 11 and a stator 12. The generator rotor 11 is coupled to the sleeve 21, and the sleeve 21 is clamped and fixed to the main shaft 4 by the oil compression port clamp 25, so that the generator rotor 11 is coupled to the main shaft 4. The oil compression port clamp 25 includes a fixing ring 25a and a movable ring 25b. When the operating fluid (typically: hydraulic oil) is supplied to the oil pressure dam provided on the oil compression port clamp 25, the movable ring 25b moves to reduce the inner diameter of the oil compression port clamp 25, thereby making the sleeve The cartridge 21 is fixed to the main shaft 4. The advantage of the oil compression port clamp 25 being disposed inside the generator 9 is that the distance between the bearing 6 and the generator 9 can be shortened, and the deflection of the main shaft 4 can be reduced.

Further, the end plate 22 is for preventing the sleeve 21 from being displaced in the axial direction (the direction parallel to the center line of the main shaft 4, hereinafter also referred to as the axial direction). In detail, the end plate 22 is mounted to span the end of the sleeve 21 and the end of the main shaft 4, and the sleeve 21 is sandwiched by the end plate 22 and the bearing retaining ring 20 for fixing the bearing 6. . In this way, the movement of the sleeve 21 in the axial direction can be suppressed.

As described in detail below, in the present embodiment, the generator 9 has a separable structure, and the generator 9 can be replaced without removing the sleeve 21 from the main shaft 4. The advantage of replacing the generator 9 without having to remove the sleeve 21 from the main shaft 4 is that the replacement of the generator can be made easier. The configuration of the generator 9 will be described in detail below.

The generator rotor 11 includes a field magnet 13 that functions as a rotor pole, a back plate 14 that supports the field magnet 13, and rotor plates 15 and 16 that support the back plate 14. The rotor plate 16 is composed of a plurality of plate members 16a, 16b. The rotor plate 15 is locked by a bolt 31 to the flange 21a of the sleeve 21. Further, the plate member 16a of the rotor plate 16 is locked and contracted by the bolt 32a to the sleeve 21, and the plate member 16b is locked by the bolt 32b to be joined to the plate member 16a. Here, please pay special attention to the fact that only one bolt 31, 32a, 32b is drawn in the drawing, but actually, a plurality of bolts 31, 32a, 32b are arranged in the circumferential direction.

Further, the stator 12 includes a stator winding 17 that functions as a stator magnetic pole, and stator plates 18 and 19 that support the stator winding 17. The stator plate 18 is composed of a plurality of plate members 18a and 18b. Similarly, the stator plate 19 is composed of a plurality of plate members 19a and 19b. The generator bearing 23 is fixed to the end portion on the inner peripheral side of the plate member 18a of the stator plate 18, and the plate member 18b is locked by the bolt 33 to the end portion on the outer peripheral side of the plate member 18a. Similarly, the generator bearing 24 is fixed to the end portion on the inner peripheral side of the plate member 19a of the stator plate 19, and the plate member 19b is locked and fixed to the end portion on the outer peripheral side of the plate member 19a by the bolts 34. In this configuration, the main shaft 4 is supported by the generator bearings 23, 24, and the generator 9 is supported by the main shaft 4. This configuration effectively disperses the mechanical load caused by the weight of the generator 9. Here, please pay special attention to the fact that although only one bolt bolt 33, 34 is drawn in the drawing, in reality, a plurality of bolts 33, 34 are arranged in the circumferential direction.

Here, please pay special attention to the bolts 33 for locking the plate members 18a, 18b of the stator plate 18, the bolts 31 for locking the flange 21a of the sleeve 21 and the rotor plate 15, for locking the rotor The bolts 32b of the plate members 16a, 16b of the plate 16 and the bolts 34 for locking the plate members 19a, 19b of the stator plate 19 are arranged in such a manner that the end of the side of the main shaft 4 on the side of the generator 9 Farther, the longer the distance between it and the central axis of the main shaft 4. That is, the position of the tying member for joining the field magnet 13 and the stator winding 17 to the sleeve 21 is configured such that the distance from the end of the main shaft 4 is the distance from the central axis of the main shaft 4 The farther it is.

More specifically, as shown in Fig. 2B, the position of the side of the plate member 18b of the stator plate 18 on the side of the sleeve 21 is compared with the flange 21a and the plate member 16a of the rotor plate 16. And the position of the end of the plate member 19a of the stator plate 19 on the side of the stator winding 17 is further apart from the central axis of the main shaft 4. Further, the position of the end portion of the rotor plate 15 on the side of the sleeve 21 is higher than the end portion of the plate member 16a of the rotor plate 16 and the plate member 19a of the stator plate 19 on the side of the stator winding 17 The position is further apart from the central axis of the main shaft 4. Further, the position of the end portion of the plate member 16b of the rotor plate 16 on the side of the sleeve 21 is a position closer to the end portion of the plate member 19a of the stator plate 19 on the side of the stator winding 17, which is apart from The distance from the central axis of the main shaft 4 is further. It is to be noted here that the flange 21a and the plate member 16a are in the rotor magnetic pole support structure for supporting the field magnet 13, and after the field magnet 13 is separated from the sleeve 21, it is still retained and bonded to the sleeve. The member on the 21, and the plate member 19a of the stator plate 19 is a member which is still attached to the sleeve 21 after the stator winding 17 is separated from the sleeve 21.

As shown in FIG. 2C, by adopting the above-described configuration, the wind power generator 1 of the present embodiment can perform the maintenance work without removing the sleeve 21 from the main shaft 4, and the generator rotor 11 can be The field magnet 13 is detached from the stator winding 17 of the stator 12. Specifically, the stator windings 17 can be detached together with the plate members 18b and 19b as long as the aforementioned bolts 33 and 34 are gradually removed. Similarly, the exciting magnet 13 can be detached together with the backing plate 14, the rotor plate 15, and the plate member 16b as long as the bolts 31, 32b are slowly removed. At this time, by adopting the configuration as shown in FIG. 2B, it is possible to avoid mutual interference between the members when performing the work of disassembling the generator 9.

Conversely, if the stator windings 17 are attached to the plate members 18b, 19b and the bolts 33, 34 are locked and locked, the stator windings 17 can be mounted and restored to their original state. Further, when the exciting magnet 13 is attached to the backing plate 14, and the rotor plate 15 and the plate member 16b are attached to the backing plate 14, and the bolts 31, 32b are locked and locked, the exciting magnet 13 can be mounted and restored. status. Therefore, according to the wind turbine generator 1 of the present embodiment, the replacement work of the most important constituent members (that is, the exciting magnet 13 and the stator winding 17) can be performed without disassembling the sleeve 21 from the main shaft 4.

Further, the member detached together with the field magnet 13 and the stator winding 17 is located on the side closer to the end of the main shaft 4 than the member remaining on the side of the sleeve 21, in such a manner that: The advantage of making the job easier. For example, in the case of the stator plate 18, the plate member 18b detached together with the stator winding 17 is locked and joined to the end of the main shaft 4 of the plate member 18a remaining on the side of the sleeve 21 Side face. Further, in the rotor plate 15 which is detached together with the field magnet 13, the rotor plate 15 is locked and joined to the side of the flange 21a of the sleeve 21 which is close to the end of the main shaft 4. Further, in the rotor plate 16, the plate member 16b detached together with the field magnet 13 is locked and joined to the side of the end portion of the plate member 16a on the side of the sleeve 21 which is close to the main shaft 4. surface. Finally, in the case of the stator plate 19, the plate member 19b detached together with the stator winding 17 is locked and joined to the side of the plate member 19a on the side of the sleeve 21 near the end of the main shaft 4. surface. The advantage of this configuration is that the disassembly operation of the field magnet 13 and the stator winding 17 is made easier.

Here, the work of locking and contracting the rotor plate 15 by the bolts 31 and the work of locking and joining the plate members 16a and 16b of the rotor plate 16 by the bolts 32a and 32b are all in the generator 9. Conducted inside. Similarly, the operation of detaching the lower bolt 31 from the rotor plate 15 and the operation of detaching the lower bolts 32a, 32b from the plate members 16a, 16b are also performed in the interior of the generator 9. When these operations are performed, if foreign matter enters the inside of the generator 9, it may cause damage to the generator 9.

In order to avoid the damage of the generator 9 due to the entry of the foreign matter, it is preferable to perform the locking operation of the bolts 31, 32a, 32b or the dismounting work, preferably inside the protective tube inserted from the stator plates 18, 19. It is advisable to perform it. 3 to 5 are schematic views showing the steps of performing the locking and contracting operation of the bolt 31 inside the protective tube 41.

As shown in Fig. 3, an opening is provided at a position corresponding to the bolt 31 of the plate member 18a of the stator plate 18. After the maintenance work is performed, the protective tube 41 is inserted into this opening. At this time, the angle of the generator rotor 11 is first adjusted to a position where the bolt 31 to be mounted can enter the inside of the protection tube 41. The protective tube 41 is inserted from the opening until it abuts against the flange 21a of the sleeve 21. At this time, in order to prevent entry of foreign matter, it is preferable that the protective tube 41 is inserted in a state in which the cover 42 is attached to the inlet. In the present embodiment, the cover 42 is detachably attached to the protective tube 41 by bolts 43a and 43b. Next, after the lower cover 42 is removed, the pre-installed bolts 31 are locked and contracted. At this time, as shown in Fig. 4, if the bolt 31 is locked by using a dedicated joining tool 44 which is thinner than the inner diameter of the protective tube 41, the work can be made easier. Next, after the cover 42 is again attached to the protective tube 41, the protective tube 41 is withdrawn to a position where it does not interfere with the rotor plate 15. Then, the generator rotor 11 is slightly rotated to a position where the protective tube 41 can be aligned with the next bolt 31 to be mounted. In the following, the same process is repeated, and the bolts 31 are sequentially locked and joined. After all the bolts 31 have been locked and locked, the opening of the plate member 18a of the stator plate 18 is closed by the cover 45 as shown in Fig. 5. According to the above steps, it is possible to prevent foreign matter from entering the inside of the generator 9 during work.

In the same manner, when the bolt 31 is detached, if the work is performed inside the protective tube 41, it is possible to prevent foreign matter from entering the inside of the generator 9 during the work.

Similarly, the bolts 32b of the rotor plate 16 can prevent foreign matter from entering the inside of the generator 9 during operation, as long as the locking and contracting and the detaching work are performed inside the protective tube. In this case, an opening is provided at a position corresponding to the bolt 32b of the plate member 19b of the stator plate 19, and the protective tube is inserted into the opening until it abuts against the plate member 16b.

According to the above steps, foreign matter can be prevented from entering when the bolts 31, 32b are locked and contracted. This is an effective way to avoid damage to the generator 9.

Next, referring to FIG. 2 again, in the wind power generator 1 of the present embodiment, it is preferable that the stator plates 18 and 19 are provided with a temporary fixture 35 for temporarily fixing the generator rotor 11. The installation structure of 36 is suitable. For example, when the generator 9 is transported, the generator rotors 11 are temporarily fixed to the stator plates 18, 19 by using the temporary fixtures 35, 36 to maintain the gap between the generator rotor 11 and the stator 12, thereby preventing The generator 9 is damaged. In the structure of Fig. 2A, the temporary fixtures 35, 36 are wedges. In this case, openings for the wedge insertion are formed in the stator plates 18, 19. The wedge is inserted between the generator rotor 11 and the stator 12 via the opening, so that the generator rotor 11 and the stator 12 can be temporarily fixed.

In another embodiment, as shown in FIG. 2D, a rod-like member such as a pin may be used as the temporary fixtures 35A and 36A. In this case, openings are formed in the stator plates 18, 19 and the rotor plates 15, 16 to allow the rod members to be inserted. The generator rotor 11 can be temporarily fixed by inserting the rod-like members through openings provided in the stator plates 18, 19 and the rotor plates 15, 16. Further, the temporary fixtures 35 and 36 may have a structure in which the stator plates 18 and 19 and the backing plate 14 are temporarily coupled. The structure for temporarily fixing the generator rotor 11 to the stator plates 18, 19 may be of various other configurations.

Further, although an embodiment of the present invention has been described above, the present invention should not be construed as being limited to the foregoing embodiments. In practicing the present invention, various changes that are readily conceivable will be apparent to those skilled in the art. In particular, in the second drawing, the rotor plates 15 and 16 are used as the connection structure for connecting the field magnet 13 and the back plate 14 to the sleeve 21. However, for those skilled in the art, it is desirable to The structure in which the field magnet 13 and the backing plate 14 are coupled to the sleeve 21 has been conceived in various modifications.

1. . . Wind power generator

2. . . Tower

3. . . Aircraft cabin seat

4. . . Spindle

5, 6. . . Bearing

7, 8. . . Bearing housing

9. . . generator

11. . . Generator rotor

12. . . stator

13. . . Excitation magnet

14. . . Backplane

15,16. . . Rotor plate

16a, 16b. . . Plate member

17. . . Stator winding

18, 19. . . Stator plate

18a, 18b, 19a, 19b. . . Plate member

20. . . Bearing retaining ring

twenty one. . . Sleeve

21a. . . Flange

twenty two. . . End plate

23, 24. . . Generator bearing

25. . . Oil compression port clamp

25a. . . M

25b. . . Movable ring

31, 32a, 32b, 33, 34, 43a, 43b. . . bolt

35, 36. . . Temporary fixture

41. . . Protective tube

42. . . cover

44. . . Concluding tools

45. . . cover

Fig. 1 is a view schematically showing the configuration of a wind power generator according to an embodiment of the present invention.

Fig. 2A is a view showing in detail a configuration of a generator in an embodiment of the present invention.

Fig. 2B is a view showing in detail a partial structure in which a generator rotor and a stator are coupled to a sleeve in an embodiment of the present invention.

Fig. 2C is a view showing a state in which the generator rotor and the stator are separated from the sleeve.

Fig. 2D is a view showing in detail a structure of a generator in another embodiment of the present invention.

Figure 3 is a diagram showing the preferred steps for tightening the bolts inside the generator.

Figure 4 is a diagram showing the preferred steps for tightening the bolts inside the generator.

Figure 5 is a diagram showing the preferred steps for tightening the bolts inside the generator.

9. . . generator

11. . . Generator rotor

12. . . stator

13. . . Excitation magnet

14. . . Backplane

15,16. . . Rotor plate

16a, 16b. . . Plate member

17. . . Stator winding

18, 19. . . Stator plate

18a, 18b, 19a, 19b. . . Plate member

20. . . Bearing retaining ring

twenty one. . . Sleeve

21a. . . Flange

twenty two. . . End plate

23, 24. . . Generator bearing

25. . . Oil compression port clamp

25a. . . M

25b. . . Movable ring

31, 32a, 32b, 33, 34. . . bolt

35, 36. . . Temporary fixture

Claims (7)

A wind power generator includes a main shaft for supporting a wind turbine rotor, a main bearing that supports the main shaft so as to be rotatable, a generator having a generator rotor and a stator, and a rotor coupled to the main shaft and inserted into the main shaft The stator includes: a stator magnetic pole arranged in a circumferential direction of the main shaft, and an arrangement in which the main shaft is coupled to the main shaft to support the stator magnetic pole so as to be rotatable relative to the main shaft in an axial direction of the main shaft The first and second stator plates; the generator rotor includes: a rotor magnetic pole arranged in the circumferential direction, and a rotor magnetic pole coupled to the main shaft for supporting the rotor magnetic pole between the first and second stator plates At least one rotor magnetic pole support structure; the first and second stator plates and the rotor magnetic pole support structure are configured to be capable of separating the rotor magnetic pole and the stator magnetic pole from the sleeve; and the first and second In the stator plate and the rotor pole support structure, the rotor pole and the stator pole are separated from the sleeve System setting to: the main shaft and the distance between the end portion on the generator side of the more recently, the closer to the spindle. The wind power generator according to claim 1, wherein the first stator plate is located at a position farther from the generator-side end of the main shaft than the second stator plate; and the first stator plate is The first plate member coupled to the sleeve and the second plate member coupled to the stator pole and detachable from the first plate member; the rotor magnetic pole support structure includes: a coupling to the sleeve a first support member coupled to the second support member that is detachably attachable to the first support member; and the second stator plate includes a third plate member coupled to the sleeve and coupled to the second support member a fourth plate member that is detachable from the third plate member; the end portion of the second plate member on the side of the sleeve is closer to the rotor magnetic pole than the first support member The end portion of the side is further away from the main shaft; and the end portion of the second supporting member on the side of the sleeve is further away from the end portion of the third plate member on the side of the stator magnetic pole The aforementioned spindle. The wind power generator according to claim 1, wherein at least one of the first stator plate and the second stator plate corresponds to the rotor magnetic pole from the sleeve corresponding to the rotor magnetic pole support structure. An opening is provided at a position where the barrel is separated. The wind power generator according to claim 1, wherein the at least one rotor magnetic pole support structure includes a plurality of rotor magnetic pole support structures arranged in an axial direction of the main shaft, and the plurality of rotor magnetic poles In each of the support structures, the position at which the rotor magnetic pole is separated from the sleeve is set such that the closer to the end of the main shaft, the closer to the main shaft. The wind power generator according to claim 1, wherein the first stator plate and the rotor magnetic pole support structure are opposed to each other, and each of the first stator plate and the rotor magnetic pole support structure is A mounting structure for attaching a temporary fixture that temporarily fixes the first stator plate and the rotor magnetic pole support structure is provided. The wind turbine generator according to claim 5, wherein the temporary fixture includes a wedge or a rod-shaped member, and the attachment structure is an opening into which the temporary fixture is inserted. A maintenance operation method for a wind turbine generator according to the third aspect of the invention, further comprising: a step of inserting a protection tube into the opening provided in the first stator plate; In the inside of the protective tube, an operation of joining the first support member of the sleeve to the second support member coupled to the rotor magnetic pole of the rotor magnetic pole support structure or the second support member from the first 1 The step of the work of removing the support member.