JP2006333593A - Stator of rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator of a rotating electric machine provided with a stator supporting structure that allows the easy combination of an outer frame and an inner frame after parallel production. <P>SOLUTION: The stator of the rotating electric machine is constituted of the outer frame, and the inner frame that is arranged in the outer frame. The outer frame is constituted of a frame that coaxially holds the inner frame and is fixed to a base, frame plates axially arranged in a plurality of places in the frame, a plurality of manholes formed in axial and circumferential directions of the frame, and a support beam arranged between a pair of the adjacent frame plates. The inner frame is constituted of a stator core formed by laminating electromagnetic thin steel plates; a core bolt for holding the stator core; bore rings that are fixed with the core bolt, surround the external periphery of the stator core, arranged at plurality of places in the axial direction, and hold the stator core together with the core bolt; and a mounting seat arranged between a pair of the adjacent bore rings. An elastic plate that supports the outer frame and the inner frame so as to be displaceable in the radial direction is welded to the support beam of the outer frame at a plurality of points in the axial direction and the circumferential direction, the elastic plate is fastened and fixed to the mounting seat with bolts, and the manholes are formed at places that correspond to the installation points of the elastic plate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stator of a rotating electric machine, and particularly relates to a structure in which a stator core such as a turbine generator is supported on a frame.

  2. Description of the Related Art Conventionally, rotating electric machines such as large-capacity generators are provided with a stator support mechanism that blocks transmission of vibrations to the foundation caused by electromagnetic force or magnetic attraction acting on the stator. The conventional technology provided with this support mechanism will be described with reference to FIGS. 9 and 10, taking a turbine generator as an example.

  FIG. 9 is a conceptual diagram showing an elastic plate mounting portion of a conventional rotating electric machine stator 100. In this figure, a stator 100 includes a stator core 1, a core bolt 2, a bore ring 3a, an elastic plate 4a, a frame 5a, a frame plate 6a, a support beam 7a, and a mounting seat 8a. The elastic plate 4a attenuates the vibration generated in the system from the stator core 1 to the core bolt 3, and suppresses the propagation of the vibration to the frame 5a and a foundation (not shown). Since sufficient vibration damping and a stator support function are required, the elastic plate 4a is required to have appropriate rigidity and strength.

FIG. 10 is a conceptual diagram illustrating a method for manufacturing the conventional rotating electric machine stator 100.
The frame 5 a manufactured in advance includes a frame plate 6 a welded to the inner peripheral side of the frame and a support beam 7 a welded between the frame plates 6. The core bolt 2 is attached to the bore ring 3a installed between the frame plates 6a by welding. Next, the elastic plate 4a is connected by a bolt between the support beam 7a attached between the mounting seat 8a and the frame plate 6a, which are components of the bore ring 3a. At this time, since there is a difference in manufacturing, such as a step or a tilt, between the mounting seat 8a and the elastic plate 4a mounting surface of the support beam 7a, the elastic plate 4a is connected after adjustment with a liner or the like so that bending or twisting does not act on the elastic plate 4a. It is necessary to match.
Thereafter, as shown in FIG. 10, the worker enters the frame 5a, and stacks the stator core 1 with the core bolts 2 attached in advance as guides. Thus, the elastic plate 4a, which is a conventional stator support mechanism, is mounted in a state where a relatively large space is secured before the stator core 1 is stacked, so the mounting seat 8 and the support beam 7 are bolted by the elastic plate 4a. Even the supporting mechanism to be coupled could be sufficiently manufactured. The above-described support mechanism for the stator core is disclosed in Patent Document 1, for example.

JP-A-53-081902 (FIG. 4)

Recently, with the aim of shortening the turbine generator manufacturing process and reducing the cost, rationalization of the manufacturing method is popular.
As one of the rationalized manufacturing methods, a method of combining an outer frame 50 and an inner frame 51, which will be described in detail later, after individually producing them in parallel, is being studied. If this method is adopted, it is possible to significantly shorten the process and, in turn, reduce the cost. Therefore, studies have been made on a structure that can be combined after the outer frame 50 and the inner frame 51 are manufactured in parallel.

  However, it is assumed that the structure shown in Patent Document 1 is adopted as it is for parallel production. At this time, when the outer frame 50 and the inner frame 51 are combined and the elastic plate 4a serving as a support mechanism is bolted, the combination accuracy of the outer frame 50 and the inner frame 51, that is, the inclination of the shaft, the deviation of the height, the radial direction The adjustment work of the elastic plate 4a and the liner provided between the support beam 7 and the mounting seat in order to secure the deviation, the in-plane inclination, etc. is very difficult because the work space is narrow, and it takes a lot of work time. In addition to spending, there was a problem that it was difficult to obtain the required accuracy. Moreover, since the work of ensuring the combination accuracy by the liner requires skilled skills, it is desired to adopt a structure that does not require liner adjustment.

  The present invention has been made to solve the above-described problems, and provides a rotating electrical machine including a stator having a structure that facilitates the combination work after an outer frame and an inner frame are produced in parallel. It is intended to provide.

  A stator of a rotating electrical machine according to the present invention includes an outer frame and an inner frame installed in the outer frame. The outer frame holds the inner frame coaxially and is a frame fixed to the foundation. And a plurality of frame plates provided in the axial direction in the frame, a plurality of manholes provided in the axial direction and the circumferential direction of the frame, and a support beam provided between a pair of adjacent frame plates. The inner frame has a stator core formed by laminating electromagnetic thin steel plates, a core bolt that holds the stator core, and a plurality of axially surroundings on the outer periphery of the stator core fixed to the core bolt. An outer frame that includes a bore ring that holds the stator core together with the core bolt, and a mounting seat that is provided between a pair of adjacent bore rings. The elastic plate that supports the inner frame so as to be displaceable in the radial direction is welded to the support beam of the outer frame at a plurality of locations in the axial direction and the circumferential direction, and is attached to the mounting seat by bolting. Is provided at a location corresponding to the mounting position of the elastic plate.

  In the stator of the rotating electrical machine according to the present invention, the outer frame includes a frame, a frame plate provided on the frame, and a support beam provided between the frame plates, and the inner frame holds a stator core and a bore ring and a core bolt And an elastic plate that supports the outer frame and the inner frame in parallel, and then supports them so that they can be displaced in the radial direction. Because it is welded and bolted to the mounting seat, it is possible to produce the outer frame and the inner frame in parallel, and to ensure combination accuracy when the outer frame and the inner frame are combined. This eliminates the need for liner adjustment work inserted between the elastic plate, support beam, and mounting seat, making it easy to obtain combination accuracy and work. There is an effect that can be shortened between.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing a schematic structure of a stator 100 of a rotating electrical machine. The stator 100 includes an outer frame 50 and an inner frame 51. The outer frame 50 includes a frame 5, a frame plate 6, a support beam 7, and a manhole 9. The frame 5 holds an inner frame 51, which will be described later, coaxially via the elastic plate 4, and is fixed to a foundation not shown.
A plurality of frame plates 6 are attached to the frame 5 in the axial direction. The support beam 7 is provided between the adjacent frame plates 6 and has a function of attaching the elastic plate 4.
The inner frame 51 includes a stator core 1, a core bolt 2, a bore ring 3, and a mounting seat 8 for the elastic plate 4.
The stator core 1 has a configuration in which electromagnetic thin steel plates are laminated. The stator core 1 serves as a guide when the electromagnetic thin steel plates are laminated, and a core bolt 2 that holds the stator core 1 and a stator core. 1 is surrounded by a core bolt 2, arranged in a plurality of locations in the axial direction, and integrated by a bore ring 3 that fixes the stator core 1 together with the core bolt 2.
The mounting seat 8 is provided between the adjacent bore rings 3 and is coupled to the support beam 7 of the outer frame 50 by the elastic plate 4.
The outer frame 50 and the inner frame 51 having such a configuration are separately manufactured in parallel, and are combined as shown in the sketch of FIG. Here, as shown in FIG. 1, the inner diameter d ₁ of the outer frame 50> the inner frame outer diameter d ₂ .
The elastic plate 4 is installed at a plurality of locations in the axial direction and the circumferential direction of the stator 100, and the plurality of manholes 9 are disposed on the outer peripheral portion of the frame 5 corresponding to the installation location of the elastic plate 4. Although not shown in FIG.

Next, the mounting structure and method of the elastic plate 4 according to the first embodiment will be described.
As described above, the outer frame 50 and the inner frame 51 are manufactured in parallel, combined by the method shown in FIG. 2, and set coaxially. This state is shown in FIG.
FIG. 3A shows an axial sketch of the state where the support beam 7, the mounting seat 8 and the elastic plate 4 of FIG. 1 are attached, and FIG. 3B shows a front view in the circumferential direction.
In FIG. 3, a flaw hole 10 for an elastic plate mounting bolt is provided on the mounting seat 8 side of the elastic plate 4 provided between the bore rings 3 of the inner frame 51. The hole 10 absorbs a mounting error, which will be described later, and is a sufficiently large hole with respect to the bolt diameter. An oval hole may be used instead of the fool hole 10. A single groove welded joint 11 is provided on the side of the support beam 7 provided between the frame plates 6 of the outer frame 50, and the support beam 7 and the elastic plate 4 are joined by welding.
In FIG. 3, there are steps such as steps and tilting between the mounting seat 8 and the elastic plate 4 mounting surface of the support beam 7, so that the elastic plate 4 is not bent or twisted. The support beam 7 side is joined by a single groove welded joint 11, and the mounting seat 8 side of the elastic plate 4 is bolted. By adopting such a structure, the combination accuracy of the outer frame 50 and the inner frame 51 can be ensured without adjustment work by the liner provided between the conventional mounting seat 8, the support beam 7 and the elastic plate 4. And the process is shortened.

  As shown in FIG. 3, by using a bolt fastening structure and a single groove welded joint structure 11 in combination with the elastic plate 4, the axial difference in inclination between the mounting seat 8 and the support beam 7 shown in FIG. θ1-θ2) can be absorbed by the hole 10 of the elastic plate 4. In FIG. 4, the inclination angle is positive in the counterclockwise direction, and θ1> 0 and θ2 <0.

  Further, the deviation (h) from the normal height H from the elastic plate mounting surface of the mounting seat 8 shown in FIG. 5 to the upper surface of the support beam 7 can be absorbed by the flaw hole 10 of the elastic plate 4.

  Further, the radial displacement (δ) between the mounting seat 8 and the support beam 7 shown in FIG. 6 is absorbed by shifting the position of the single groove welded joint 11 of the elastic plate 4 within the range of the plate thickness t of the support beam 7. Therefore, there is an advantage that the inner frame 51 and the outer frame 50 are not restricted.

  Further, the error between the elastic plate mounting surface of the mounting seat 8 shown in FIG. 7 and the right angle of the upper surface (A) of the support beam 7 can be absorbed by the collapse of the elastic plate 4 positioned when the elastic plate 4 is welded. it can.

  The positional relationship between the mounting seat 8 and the supporting beam 7 is accurately welded to the bore ring 3 and the frame plate 6 so as not to affect the strength and the like during the production and assembly of the parts.

As described above, by using the bolting structure and the welding structure in combination with the elastic plate 4, it is easy to mount the plate from the outside of the rotating electric machine stator, and between the mounting plate 8 and the elastic plate 4 mounting surface of the support beam 7. Even if there is an error such as a step or a tilt generated in production, the elastic plate 4 can be mounted without requiring adjustment work by a skilled liner due to the positioning and the hole in the elastic plate 4 during welding.
Note that welding of the elastic plate 4 to the mounting seat 8 and the support beam 7 and bolt fastening work are performed through a manhole provided in the frame 5. Further, the outer frame 50 and the inner frame 51 are installed on a dedicated tool (not shown) in the state shown in FIG.

Embodiment 2. FIG.
Next, the second embodiment will be described with reference to the drawings.
FIG. 8 shows the second embodiment. The structure is similar to that of the first embodiment, and a single-groove welded joint 11 is provided on the mounting seat 8 side of the elastic plate 4, and a burr hole 10 for elastic plate mounting bolts is provided on the support beam 7 side. That is, FIG. 3 shown in the first embodiment is obtained by reversing the single groove weld joint 11 and the bolt fastening position. Here, it is necessary to increase the plate thickness of the mounting seat 8 to increase the Boaringu OD clogging inner frame outer diameter d _2, the inner frame 51 outer diameter d ₂ at the inner frame 51 and outer frame 50 coupled to the outer frame inside diameter d ₁ The plate thickness is increased within the range where there is no interference.
Thus, the effect similar to Embodiment 1 can be show | played by using together a bolt fastening structure and a welding structure.

  Embodiments 1 and 2 of the present invention can be applied to a rotating electric machine, particularly a stator of a turbine generator.

It is sectional drawing which shows schematic structure of the stator of Embodiment 1 of this invention. It is a sketch which shows the stator combination operation | work of Embodiment 1 of this invention. It is a figure which shows the attachment structure of the elastic board of Embodiment 1 of this invention. It is a figure which shows the combination error of the inner frame and outer frame of Embodiment 1 of this invention. It is a figure which shows the combination error of the inner frame and outer frame of Embodiment 1 of this invention. It is a figure which shows the combination error of the inner frame and outer frame of Embodiment 1 of this invention. It is a figure which shows the combination error of the inner frame and outer frame of Embodiment 1 of this invention. It is a figure which shows the attachment structure of the elastic board of Embodiment 2 of this invention. It is a sketch which shows the elastic board attaching part of the conventional rotary electric machine stator. It is the schematic which shows the working method at the time of the conventional rotary electric machine stator manufacture.

Explanation of symbols

1 Stator core, 2 core bolts, 3 bore rings, 4 frames, 6 frame plates,
7 Support beam, 8 mounting seat, 9 manhole, 10 fool hole, 11 single groove welded joint,
50 outer frame, 51 inner frame, 100 stator.

Claims (3)

A stator of a rotating electrical machine, wherein the stator is composed of an outer frame and an inner frame installed in the outer frame, and the outer frame holds the inner frame coaxially and serves as a basis. A frame to be fixed, a plurality of frame plates provided in the axial direction in the frame, a plurality of manholes provided in the axial direction and the circumferential direction of the frame, and a pair of adjacent frame plates The inner frame includes a stator core formed by stacking electromagnetic thin steel plates, a core bolt that holds the stator core, and a stator core that is fixed to the core bolt and that is fixed to the stator core. A bore ring that surrounds the outer periphery and is provided in a plurality of axial directions and holds the stator core together with the core bolt, and a mounting seat that is provided between the pair of adjacent bore rings. And an elastic plate supporting the outer frame and the inner frame so as to be displaceable in a radial direction is welded to a support beam of the outer frame at a plurality of locations in an axial direction and a circumferential direction. The stator of the rotating electrical machine, wherein the manhole is provided at a position corresponding to the mounting position of the elastic plate. A stator of a rotating electrical machine, wherein the stator is composed of an outer frame and an inner frame installed in the outer frame, and the outer frame holds the inner frame coaxially and serves as a basis. A frame to be fixed, a plurality of frame plates provided in the axial direction in the frame, a plurality of manholes provided in the axial direction and the circumferential direction of the frame, and a pair of adjacent frame plates The inner frame includes a stator core formed by stacking electromagnetic thin steel plates, a core bolt that holds the stator core, and a stator core that is fixed to the core bolt and that is fixed to the stator core. A bore ring that surrounds the outer periphery and is provided in a plurality of axial directions and holds the stator core together with the core bolt, and a mounting seat that is provided between the pair of adjacent bore rings. An elastic plate configured to support the outer frame and the inner frame so as to be displaceable in the radial direction is bolted to the support beam of the outer frame at a plurality of positions in the axial direction and the circumferential direction, and the mounting is performed. A stator for a rotating electrical machine, wherein the seat is welded to a seat, and the manhole is provided at a location corresponding to a mounting position of the elastic plate. The elastic plate has a flange hole larger than a bolt diameter necessary to absorb an axial inclination between the outer frame and an installation error in the height direction when the outer frame is installed on the inner frame. Alternatively, the rotating electric machine stator according to claim 1, wherein the stator is bolted to the support beam.

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