JP6629385B2 - Stator for generator and method of manufacturing the same - Google Patents

Description

  The present invention relates to a stator for a generator configured by laminating a segment-type (fan-shaped) iron core, a circular iron core, a polygonal iron core, and the like, and a method of manufacturing the same.

A method of attaching a stator core of a generator to a large outer frame has been proposed (Patent Document 1).
In this method, as shown in FIG. 9, a stator iron core 10 is formed by stacking fan-shaped thin iron plates while shifting them so that seams do not overlap, and inserting the stator iron core 10 into the inner frame 13. Then, a tightening bolt 11 is inserted, and tightened with a nut 12. It is described that after the stator core 10 is assembled, the inner frame 13 is inserted into the outer frame 14, and the seam is welded all around.

JP-A-6-261474

  The invention described in Patent Literature 1 requires not only a long time for the entire circumference welding operation of the inner frame 13 and the outer frame 14, but also incomplete welding or distortion of the stator frame, and In addition, there is a problem that vibration may occur due to fluctuations in the magnetic field due to the fact that the gap between the stator and the rotor is not constant.

  An object of the present invention is to provide a generator stator and a method of manufacturing the stator, which can be simply and reliably assembled by making the stator frame function as a jig when assembling the stator.

The method of manufacturing a generator stator according to the present invention includes:
Attaching a core key 29 to a support post 24 provided at predetermined intervals on a stator frame inner peripheral edge 25 of the stator frame 20;
Stacking the iron core 23 using the core key 29 as a guide;
A step of fastening the laminated iron core 23 with the iron core tightening bolts 32 to form the stator 21;
Removing the core key 29 from the stator 21;
Extracting the stator 21 from the stator frame 20;
A step of integrally impregnating the stator 21 and the coil 35 attached to the stator 21 with resin;
Fixing the resin-impregnated stator 21 so as to face the stator frame inner peripheral edge 25 of the stator frame 20.

  A step of welding a guide key 37 to the outer diameter side of the stator 21 is added after the step of forming the stator 21 by fastening the laminated iron core 23 with the iron core fastening bolts 32.

  The step of welding the guide key 37 to the outer diameter side of the stator 21 includes forming the guide groove 27 on the outer diameter side of the stator 21, fitting the guide key 37 into the guide groove 27, and welding. Features.

  In the step of laminating the iron core 23 with the core key 29 as a guide, a core key groove 26 for fitting the core key 29 is formed in an outer diameter portion of the iron core 23, and the core key groove 26 is fitted to the core key 29 by fitting. It is characterized by being laminated.

  The core key groove 26 is formed as a dovetail groove having a wide inside, and the core key 29 is formed of a wide end formed in the dovetail groove.

The stator for the generator of the present invention,
A core key groove 26 and a guide groove 27 are alternately formed at a predetermined central angle on the outer periphery of the sector, a coil mounting slot 28 is formed on the inner periphery of the sector, and a tightening bolt hole 34 is formed at the center. Iron core 23,
At the inner peripheral edge 25 of the stator frame, a column 24 for detachably attaching the core key 29 is formed at a position corresponding to the core key groove 26 with an adjusting plate 36 interposed therebetween. A stator frame 20 forming
On the stator support plate 40, the core key groove 26 of the iron core 23 is fitted to the core key 29, and a ventilation plate 39 that forms a ventilation hole for cooling is provided for every predetermined number of sheets, and is laminated. A stator 21 formed by inserting an iron core tightening bolt 32 into the tightening bolt hole 34 together with the iron core holding plate 31;
A guide key 37 fitted into the guide groove 27 and integrally welding the stator 21 ;
Those Ri coil 35 and Tona mounted on the coil mounting slots 28, the Koaki groove 26 inwardly to the wide dovetail, said Koaki 29, forming a tip that fits into the dovetail groove wider characterized in that it consists of.

According to the first aspect of the present invention,
Attaching a core key 29 to a support post 24 provided at predetermined intervals on a stator frame inner peripheral edge 25 of the stator frame 20;
Stacking the iron core 23 using the core key 29 as a guide;
A step of fastening the laminated iron core 23 with the iron core tightening bolts 32 to form the stator 21;
Removing the core key 29 from the stator 21;
Extracting the stator 21 from the stator frame 20;
A step of integrally impregnating the stator 21 and the coil 35 attached to the stator 21 with resin;
Fixing the resin-impregnated stator 21 so as to face the stator frame inner peripheral edge 25 of the stator frame 20. Therefore, by using the stator frame 20 as a jig for laminating the iron core 23, The stator 21 can be easily assembled without using an assembly jig. When the stator frame 20 is too large to enter the resin impregnation tank, only the stator 21 can be impregnated with the resin.

According to the invention described in claim 2,
After the step of forming the stator 21 by fastening the laminated core 23 with the core fastening bolts 32, a step of welding a guide key 37 to the outer diameter side of the stator 21 is added. The child 21 can be more securely fixed.

According to the invention described in claim 3,
The step of welding the guide key 37 to the outer diameter side of the stator 21 includes forming the guide groove 27 on the outer diameter side of the stator 21, fitting the guide key 37 into the guide groove 27, and welding. As a result, the welding process becomes simple and reliable.

According to the invention described in claim 4,
In the step of laminating the iron core 23 with the core key 29 as a guide, a core key groove 26 for fitting the core key 29 is formed in an outer diameter portion of the iron core 23, and the core key groove 26 is fitted to the core key 29 by fitting. Since the layers are stacked, circumferential positioning during stacking can be easily performed.

According to the invention described in claim 5,
The core key groove 26 has a wide groove on the inner side, and the core key 29 is formed with a wide end that fits into this groove. Can be done easily.

According to the invention described in claim 6,
The stator for the generator of the present invention,
A core key groove 26 and a guide groove 27 are alternately formed at a predetermined central angle on the outer periphery of the sector, a coil mounting slot 28 is formed on the inner periphery of the sector, and a tightening bolt hole 34 is formed at the center. Iron core 23,
At the inner peripheral edge 25 of the stator frame, a column 24 for detachably attaching the core key 29 is formed at a position corresponding to the core key groove 26 with an adjusting plate 36 interposed therebetween. A stator frame 20 forming
On the stator support plate 40, the core key groove 26 of the iron core 23 is fitted to the core key 29, and a ventilation plate 39 that forms a ventilation hole for cooling is provided for every predetermined number of sheets, and is laminated. A stator 21 formed by inserting an iron core tightening bolt 32 into the tightening bolt hole 34 together with the iron core holding plate 31;
A guide key 37 fitted into the guide groove 27 and integrally welding the stator 21 ;
Those Ri coil 35 and Tona mounted on the coil mounting slots 28, the Koaki groove 26 inwardly to the wide dovetail, said Koaki 29, forming a tip that fits into the dovetail groove wider since consisting, it is possible to make the power generation operation of the structure stable and robust. In addition, a stator for a generator in which the iron cores 23 are accurately laminated is obtained.

1 is a flowchart showing an assembling sequence showing an embodiment of a generator stator and a method of manufacturing the same according to the present invention. It is a longitudinal cross-sectional view of the process of laminating the iron core 23 using the stator frame 20 as a jig. FIG. 3 is a sectional view taken along line AA in FIG. 2. It is a side view which shows the lamination state of the iron core 23. It is a top view of one fan-shaped iron core 23. FIG. 4 is a plan view of a state in which the laminated cores 23 are welded by guide keys 37. FIG. 4 is a longitudinal sectional view showing a state where a stator 21 is attached to a stator frame 20. FIG. 3 is a partially cutaway front view showing a state where a stator 21 and a rotor 22 are assembled to a stator frame 20. It is sectional drawing which shows the assembly method of the conventional stator core.

The method of manufacturing a generator stator according to the present invention includes:
Attaching a core key 29 to a support post 24 provided at predetermined intervals on a stator frame inner peripheral edge 25 of the stator frame 20;
Stacking the iron core 23 using the core key 29 as a guide;
A step of fastening the laminated iron core 23 with the iron core tightening bolts 32 to form the stator 21;
Removing the core key 29 from the stator 21;
Extracting the stator 21 from the stator frame 20;
A step of integrally impregnating the stator 21 and the coil 35 attached to the stator 21 with resin;
Fixing the resin-impregnated stator 21 so as to face the stator frame inner peripheral edge 25 of the stator frame 20.

  It is preferable to add a step of welding a guide key 37 to the outer diameter side of the stator 21 after the step of forming the stator 21 by fastening the laminated iron core 23 with the iron core fastening bolts 32.

  In the step of welding the guide key 37 to the outer diameter side of the stator 21, a guide groove 27 is formed on the outer diameter side of the stator 21, and the guide key 37 is fitted into the guide groove 27 and welded.

  In the step of laminating the iron core 23 with the core key 29 as a guide, a core key groove 26 for fitting the core key 29 is formed in an outer diameter portion of the iron core 23, and the core key groove 26 is fitted to the core key 29 by fitting. Laminate.

The stator for the generator of the present invention,
A core key groove 26 and a guide groove 27 are alternately formed at a predetermined central angle on the outer periphery of the sector, a coil mounting slot 28 is formed on the inner periphery of the sector, and a tightening bolt hole 34 is formed at the center. Iron core 23,
At the inner peripheral edge 25 of the stator frame, a column 24 for detachably attaching the core key 29 is formed at a position corresponding to the core key groove 26 with an adjusting plate 36 interposed therebetween. A stator frame 20 forming
On the stator support plate 40, the core key groove 26 of the iron core 23 is fitted to the core key 29, and a ventilation plate 39 that forms a ventilation hole for cooling is provided for every predetermined number of sheets, and is laminated. A stator 21 formed by inserting an iron core tightening bolt 32 into the tightening bolt hole 34 together with the iron core holding plate 31;
A guide key 37 fitted into the guide groove 27 and integrally welding the stator 21 ;
Those Ri coil 35 and Tona mounted on the coil mounting slots 28, the Koaki groove 26 inwardly to the wide dovetail, said Koaki 29, forming a tip that fits into the dovetail groove wider It consists of

Example 1 of the assembly steps (S-1) to (S-9) of the generator stator and the method of manufacturing the same according to the present invention will be described with reference to the drawings.
(S-1) Step of Attaching Core Key 29 to Stator Frame 20 As shown in FIG. 8, the stator frame 20 has the stator 21 attached to the stator frame inner peripheral edge 25, and is installed on an installation base 42. The rotor 22 fits inside the installed stator 21.
As shown in FIGS. 2 and 3, columns 24 are provided on the inner peripheral edge 25 of the stator frame 20 at a predetermined center angle 2θ. Assuming that the central angle 2θ is the central angle 4θ of the segment-shaped (sector-shaped) iron core 23 = 40 degrees, the columns 24 are provided at intervals of the central angle 2θ = 20 degrees. As shown in FIGS. 3 and 5, on the outer peripheral edge of the iron core 23, core key grooves 26 and guide grooves 27 are provided alternately at intervals of θ = 10 degrees. The core key groove 26 is a dovetail groove whose inside is gradually widened, and the guide groove 27 is provided so that its width is gradually narrowed inside. Further, the guide grooves 27 at both ends are combined with the guide grooves 27 having a half width of the adjacent iron core 23 to form one guide groove 27. A slot 28 for mounting a coil 35 described later is provided on the inner peripheral edge of the iron core 23, and a plurality of fastening bolt holes 34 are formed in the center of the iron core 23.
As shown in FIG. 2 and FIG. 3, the distal end side for fitting into the core key groove 26 is wide along the stator frame inner peripheral edge 25 of the support column 24 of the stator frame 20 configured as described above. A wedge-shaped core key 29 is attached with a bolt 30 via an adjusting plate 36.

(S-2) Step of Laminating the Iron Core 23 Using the Core Key 29 as a Guide As shown in FIG. 2, a ring as shown in FIG. 8 is placed on a stator support plate 40 provided at the lower end of the stator frame 20. A finger 38 having the same slot as the slot 28 is placed on the iron core holding plate 31 and the fan-shaped core 23 is laminated on the finger 38. At this time, the core key groove 26 is formed not only in the iron core 23 but also in the iron core pressing plate 31 and the finger 38, and the core keys 29 are sequentially laminated with the core key 29 as a guide. Assuming that the central angle is 40 degrees, the iron core 23 makes one round (360 degrees) with nine sheets. However, as shown in FIG. 4, the iron cores 23 are sequentially stacked with a shift of θ / 2 = 20 degrees so that the seams do not match. When the iron core 23 has a predetermined thickness, a ventilation plate 39 forming a ventilation opening for cooling is sandwiched, and the iron core 23 and the ventilation plate 39 are sequentially laminated. The finger 38 and the iron core pressing plate 31 are further stacked on the iron core 23 that has been stacked a predetermined number of times to form a stacked body.
The iron core 23 is not limited to a fan shape, and may be a single circular iron core, a polygonal iron core, or the like.

(S-3) Step of Tightening Laminated Cores 23 with Iron Core Tightening Bolts 32 The iron core tightening bolts 32 are inserted into the tightening bolt holes 34 of the laminated body constituted by the above-described steps, and the stator 21 is tightened with the upper and lower nuts 33. And The core fastening bolts 32 and washers are insulated to prevent current from flowing due to magnetic flux during operation by penetrating the iron core 23.

(S-4) Step of Arranging and Welding the Guide Key 37 on the Outer Diameter Side of the Stator 21 As shown in FIG. 6, the guide key 37 is fitted into the guide groove 27 on the outer peripheral portion of the laminated body of the stator 21. Both sides of the guide key 37 are welded to the laminated body of the stator 21 to integrate the laminated body of the stator 21. An opening is provided in the side plate 43 of the stator frame 20 for welding work.

(S-5) Step of Removing the Core Key 29 In FIG. 2, the bolt 30 fixing the core key 29 to the column 24 is removed. At this time, an opening is provided in the side plate 43 of the stator frame 20 to facilitate the work of removing the bolt 30. The core key 29, which has not been fixed to the column 24, is removed from the core key groove 26 of the laminated body of the stator 21.

(S-6) Step of extracting the pressed laminated body of the stator 21 from the stator frame 20 The laminated body of the stator 21 mounted and laminated on the stator support plate 40 at the lower end of the stator frame 20 has a core key 29. By extracting, it is once extracted from the stator frame 20. At the time of extracting the laminated body of the stator 21, by extracting the adjusting plate 36 together with the core key 29, the laminated body of the stator 21 can be easily extracted from the stator frame 20.

(S-7) Step of Cutting by Adjusting the Outer Diameter of the Guide Key 37 to the Inner Peripheral Edge 25 of the Stator Frame 20 The outer diameter of the welded guide key 37 is the inner perimeter of the stator frame of the stator frame 20. A cutting process is performed so that the diameter matches 25 or a slightly smaller diameter.

(S-8) Step of impregnating the stator 21 and the coil 35 integrally with the resin The coil 35 is fitted into the slot 28 of the laminated body of the stator 21, and the stator 21 is attached to the resin tank integrally with the coil 35. A resin coating is formed on the entire outer periphery.

(S-9) Step of Fitting and Fixing Stator 21 to Stator Frame 20 When the coating film of the stator 21 is cured, as shown in FIG. 7, it is fixed to the stator support plate 40 at the lower end of the stator frame 20. The child 21 is fitted so as to be placed thereon. At this time, the outer peripheral surface of the stator 21 and the inner peripheral edge 25 of the stator frame 20 of the stator frame 20 are fitted with a uniform gap (for example, 0.5 mm) all around. A stator support plate 40 as shown in FIGS. 7 and 8 is placed on the fitted stator 21, and fixed to the stator frame 20 with screws 41.

  In the above-described embodiment, the stator frame 20 is used as a jig when the laminated body of the stator 21 is assembled, and once the laminated body of the stator 21 is assembled, the stator frame 20 is once removed from the stator frame 20 and integrated with the coil 35. In a resin tank to impregnate the resin. With such a configuration, even if the stator frame 20 is too large to be immersed in the resin tank, only the laminated stator 21 can be immersed in the resin tank, and the size of the resin tank is limited. In some cases, it is suitable for impregnating the stator 21 with resin.

  FIG. 8 shows an example in which the stator frame 20 is a vertical type (the rotation axis of the rotor is a horizontal type). However, in the present invention, the stator frame 20 is a horizontal type (the rotation axis of the rotor is a vertical type). Can also be employed.

  DESCRIPTION OF SYMBOLS 10 ... Stator core, 11 ... Tightening bolt, 12 ... Nut, 13 ... Inner frame, 14 ... Outer frame, 20 ... Stator frame, 21 ... Stator, 22 ... Rotor, 23 ... Iron core, 24 ... Prop, 25 ... inner peripheral edge of stator frame, 26 ... core key groove, 27 ... guide groove, 28 ... slot, 29 ... core key, 30 ... bolt, 31 ... iron core holding plate, 32 ... iron core tightening bolt, 33 ... nut, 34 ... tightening bolt hole , 35 ... coil, 36 ... adjustment plate, 37 ... guide key, 38 ... finger, 39 ... ventilation plate, 40 ... stator support plate, 41 ... screw, 42 ... installation base, 43 ... side plate.

Claims (6)

Attaching a core key 29 to a support post 24 provided at predetermined intervals on a stator frame inner peripheral edge 25 of the stator frame 20;
Stacking the iron core 23 using the core key 29 as a guide;
A step of fastening the laminated iron core 23 with the iron core tightening bolts 32 to form the stator 21;
Removing the core key 29 from the stator 21;
Extracting the stator 21 from the stator frame 20;
A step of integrally impregnating the stator 21 and the coil 35 attached to the stator 21 with resin;
Fixing the resin-impregnated stator 21 so as to face the inner periphery 25 of the stator frame of the stator frame 20.   2. A step of welding a guide key 37 to an outer diameter side of the stator 21 after the step of forming the stator 21 by fastening the laminated iron core 23 with the iron core fastening bolts 32. A method for manufacturing the stator for a generator according to the above.   The step of welding the guide key 37 to the outer diameter side of the stator 21 includes forming the guide groove 27 on the outer diameter side of the stator 21, fitting the guide key 37 into the guide groove 27, and welding. A method for manufacturing a stator for a generator according to claim 2.   In the step of laminating the iron core 23 with the core key 29 as a guide, a core key groove 26 for fitting the core key 29 is formed in an outer diameter portion of the iron core 23, and the core key groove 26 is fitted to the core key 29 by fitting. The method according to claim 1, wherein the stator is laminated.   The generator core fixing according to claim 4, wherein the core key groove (26) is a dovetail groove having a wide inner side, and the core key (29) is formed with a wide tip formed in the dovetail groove. Child manufacturing method. A core key groove 26 and a guide groove 27 are alternately formed at a predetermined central angle on the outer periphery of the sector, a coil mounting slot 28 is formed on the inner periphery of the sector, and a tightening bolt hole 34 is formed at the center. Iron core 23,
At the inner peripheral edge 25 of the stator frame, a column 24 for detachably attaching the core key 29 is formed at a position corresponding to the core key groove 26 with an adjusting plate 36 interposed therebetween. A stator frame 20 forming
On the stator support plate 40, the core key groove 26 of the iron core 23 is fitted to the core key 29, and a ventilation plate 39 that forms a ventilation hole for cooling is provided for every predetermined number of sheets, and is laminated. A stator 21 formed by inserting an iron core tightening bolt 32 into the tightening bolt hole 34 together with the iron core holding plate 31;
A guide key 37 fitted into the guide groove 27 and integrally welding the stator 21 ;
Those Ri coil 35 and Tona mounted on the coil mounting slots 28, the Koaki groove 26 inwardly to the wide dovetail, said Koaki 29, forming a tip that fits into the dovetail groove wider A stator for a generator, comprising:

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