JP2002027689A - Stator of dynamo-electric machine, and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the stator of a dynamo-electric machine, which can enhance work efficiency of stacking of iron cores and the contraction of a term of works. SOLUTION: This stator is equipped with a stator iron core 18, which is made by stacking many plates 17, where a plurality of cuts are made at prescribed intervals in the circumferential direction at the periphery, with the positions of their cuts being trued up, a plurality of core bolts 19 which are interposed along each cut, and a support ring 11 which fastens the stator iron core 18 from around via each core bolt 19, and this is constituted by fixing each core bolt 19 for unification by the welding of the support ring 11, after fastening of the support ring 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of disposing a plurality of core bolts around a stator core formed by laminating steel plates, and fastening the stator core from the periphery by supporting rings disposed around the core bolts via the core bolts. Then, the present invention relates to a stator core of a rotating electric machine constituted by fixing and integrating each core bolt and a support ring by welding, and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 11 is a perspective view showing the structure of a stator of a conventional rotary electric machine of this type, and FIG. 12 is a cross-sectional view showing the structure of a main part of the stator of the rotary electric machine in FIG. In the drawing, reference numeral 1 denotes an outer frame of a rotating electric machine, 2 denotes a plurality of frame plates disposed at predetermined intervals in an axial direction in the outer frame 1, and 3 denotes a cage-like shape supported by each of the frame plates 2. The bore ring 4 is a core bolt having a circular cross section which is fixed to the inside of the bore ring 3 by, for example, welding 5 and is arranged to extend in the axial direction.
Plural pieces are attached at predetermined intervals in the circumferential direction. Reference numeral 6 denotes an elastic member inserted between the bore ring 3 and each of the core bolts 4, and reference numeral 7 denotes a notch 8 a formed at an outer peripheral surface of the core bolt 4 at a position corresponding to each of the core bolts 4. The stator core is formed by laminating a plurality of steel plates 8.

[0003] A conventional stator of a rotating electric machine is configured as described above. First, a bore ring 3 is fixedly integrated with each frame plate 2 arranged in an outer frame 1. Next, as shown in FIG. 12, each core bolt 4 is fixed to the inner peripheral side of the bore ring 3 at a predetermined interval in the circumferential direction by welding 5, and at this time, there is a gap between the bore ring 3 and each core bolt 4. Elastic member 6
Are interposed to absorb defects such as dimensional errors. Next, the steel plates 8 are stacked one by one while fitting each notch 8a with the position of each notch 8a in accordance with the position of each core bolt 4, and when the stacking of all the sheets is completed, finally, although not shown, for example, each steel plate 8 The stator core 7 is assembled by tightening and fixing in the axial direction with through bolts penetrating in the axial direction.

[0004]

Since the stator of the conventional rotary electric machine is constructed and assembled as described above, in order to form the stator core 7, for example, about 50,000 steel plates 8 are laminated. The notch 8 formed in the limited space in the outer frame 1 and on the outer peripheral surface of each steel plate 8 is necessary.
Since a must be laminated one by one while being fitted to each core bolt 4, there is a problem that work efficiency is poor and a long construction period is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stator for a rotating electric machine capable of improving the work efficiency of iron core stacking and shortening the construction period, and a method of manufacturing the same. It is intended for.

[0006]

According to a first aspect of the present invention, there is provided a stator for a rotary electric machine comprising a plurality of steel plates having a plurality of cutouts formed on an outer peripheral surface thereof at predetermined intervals in a circumferential direction. , Stator cores formed by laminating the notch portions in the same position, a plurality of core bolts inserted along each notch portion, and stator cores fastened from the periphery via each core bolt The core ring is fixedly integrated with the support ring by welding after the support ring is fastened.

According to a second aspect of the present invention, there is provided a stator for a rotating electrical machine according to the first aspect, wherein the cross-sectional shape of the core bolt is formed to be a rectangle having a long side to be welded.

According to a third aspect of the present invention, there is provided a stator for a rotating electrical machine according to the first aspect, wherein the cross-sectional shape of the core bolt is formed into a trapezoid having a long side to be welded.

According to a fourth aspect of the present invention, there is provided a stator for a rotating electric machine according to the first aspect, wherein the cross-sectional shape of the core bolt is formed to be a semicircle having a radius on a side to be welded. It is.

According to a fifth aspect of the present invention, there is provided a stator for a rotary electric machine according to the first aspect, wherein an elastic member is interposed between the support ring and the stator core.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a stator for a rotating electrical machine, comprising the steps of forming a plurality of notches at predetermined intervals in a circumferential direction on each outer peripheral surface of a number of steel plates. A step of forming a stator core by laminating each steel sheet while aligning the positions of the notches, a step of inserting a core bolt along the notch of each steel sheet, and The method includes a step of arranging a support ring around the periphery and fastening the stator core from the periphery through each core bolt, and a step of fixing and integrating the core bolt and the support ring by welding.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a configuration of a main part of a stator of a rotating electric machine according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view showing a cross section taken along line II-II in FIG. 1, and FIG. Line III-II in
FIG. 4 is a perspective view showing a configuration of the support ring shown in FIG. 1, FIG. 5 shows a configuration of a fixing portion between the core bolt and the support ring, (A) is a front sectional view, B)
FIG. 6 is a side sectional view, and FIG. 6 is a view for explaining a method of fastening the support ring.

In the drawing, reference numeral 11 denotes a support ring, which is a pair of band-shaped members 12 and 13 formed in a ring shape having one cut portion on the periphery as shown in FIG.
13 and a pair of connecting members 14 and 15 having bolt fastening holes 14a and 15a formed at corresponding positions, and a predetermined distance in the circumferential direction between both band members 12 and 13. Are arranged via the two belt-shaped members 12, 1
It is composed of a plurality of plate-like members 16 connecting the three. Reference numeral 17 denotes a large number of steel plates having a plurality of notches 17a formed on the outer peripheral surface at predetermined intervals in the circumferential direction. The notches 17a are formed in a shape to which core bolts described later can be fitted. Thus, the stator core 18 is formed. Reference numeral 19 denotes a plurality of rod-shaped core bolts having a square cross-sectional shape, and reference numeral 20 denotes a welded portion for fixing and integrating the core bolt 19 and the support ring 11.

Next, a method for assembling the stator of the rotating electric machine according to the first embodiment of the present invention, which is constituted by the above-described members, will be described with reference to the drawings. First, a plurality of notches 17a are formed on the outer peripheral surface of a number of steel plates 17 at predetermined intervals in the circumferential direction. Then, FIGS. 2 and 3
As shown in (1), the steel plates 17 are stacked in a state where the positions of the notches 17a are substantially aligned. Next, the core bolt 19 is inserted along each groove formed by the cutout portion 17a of each steel plate 17, and the support ring 11 is inserted.
As shown in FIG. 6 (B), the space between the two connecting members 14 and 15 is widened, inserted into the outer peripheral side of each laminated steel plate 17, and arranged by a predetermined number.

Next, although not shown, an elastic member is inserted between the plate member 16 of each support ring 11 and the outer peripheral surface of each steel plate 17, and then both connecting members 14, 15 of each support ring 11 are inserted.
6A is returned to its original state as shown in FIG. 6 (A), and the outer surface of each core bolt 19 is fixed to the elastic member by tightening with a tightening bolt (not shown) through each bolt tightening hole 14a, 15a. By pressing the core bolts 19 into the notches 17a of the steel plates 17 as shown in FIG. 5 by pressing the core bolts 19 into the steel plate 17 side by the support ring 11, the steel plates 17 are aligned with respect to the core bolts 19. Becomes Then, in this aligned state, a welded portion 20 is formed between each of the core bolts 19 and the belt-shaped members 12 and 13 of the support ring 11 so as to be fixedly integrated. As a result, the stator core 18 is formed, and the integrated support ring 11 and the stator core 18 (not shown) are incorporated in an outer frame (not shown) of the rotating electric machine to form a stator of the rotating electric machine. Complete.

As described above, according to the first embodiment, a large number of steel plates 17 having a plurality of notches 17a formed on the outer peripheral surface are stacked while the positions of the notches 17a are substantially aligned. The core bolt 19 is inserted along each notch 17a, and the support ring 11 is
And tighten each core bolt 19 with each notch 17a.
Each steel plate 17 is pressed into
9, the support ring 11 and the core bolt 19 are fixed and integrated by welding to form the stator core 18 in this aligned state. It is not necessary to stack tens of thousands of steel sheets one by one within the outer frame limited to the above, so that the work efficiency of iron core stacking can be improved and the construction period can be shortened.
In addition, since the elastic member can be inserted between the plate member 16 of the support ring 11 and the outer peripheral surface of each steel plate 17, it is possible to prevent the vibration of the stator core 18 from being transmitted to another. Can be.

Embodiment 2 FIG. FIG. 7 shows a configuration of a fixed portion between a core bolt and a support ring of a stator of a rotary electric machine according to Embodiment 2 of the present invention, where (A) is a front sectional view,
8 (B) is a side cross-sectional view, and FIGS. 8 to 10 are front cross-sectional views each showing a structure different from FIG. 7 of a portion where a core bolt and a support ring of a stator of a rotary electric machine according to Embodiment 2 of the present invention are fixed. . In FIG. 7, the first embodiment is described.
The same parts as those in are denoted by the same reference numerals and description thereof is omitted. Reference numeral 21 denotes a core bolt inserted into the cutout portion 17b of the steel plate 17, and has a rectangular cross-sectional shape in which the side on which the welded portion 20 is formed is long.

As described above, according to the second embodiment, since the cross-sectional shape of the core bolt 21 is a rectangle having a long side on the side where the welded portion 20 is formed, the welded portion 20 can be made long and the mechanical strength can be increased. Can be improved. For example, as shown in FIGS. 8 and 9, the cross-sectional shape of each of the core bolts 22 and 23 is a trapezoid having a long side on the side where the welded portion 20 is formed.
7c, 17d may be inserted,
And the mechanical strength can be improved, and the alignment of the steel plates 17 is further facilitated by the wedge effect at the contact portions between the core bolts 22 and 23 and the notches 17c and 17d. It can be carried out. or,
As shown in FIG. 10, the cross-sectional shape of the core bolt 24 is a semicircle having a radius on the side on which the welded portion 20 is formed.
Even if it inserts in the notch part 17e of the steel plate 17,
As described above, the mechanical strength can be improved.

[0019]

As described above, according to the first aspect of the present invention, a large number of steel sheets having a plurality of notches formed on the outer peripheral surface at predetermined intervals in the circumferential direction are formed in each notch. A stator core formed by laminating in a state where the positions of the parts are aligned, a plurality of core bolts inserted along each notch, and a support ring for fastening the stator core from the periphery through each core bolt. The present invention provides a stator for a rotating electric machine capable of improving the work efficiency of iron core stacking and shortening the construction period because each core bolt is fixedly integrated with the support ring by welding after the support ring is fastened. be able to.

According to a second aspect of the present invention, in the first aspect, the sectional shape of the core bolt is formed to be a rectangle having a long side on a side to be welded, so that the work efficiency of iron core stacking is improved. In addition, it is possible to provide a stator of a rotating electric machine capable of shortening the construction period and improving mechanical strength.

According to a third aspect of the present invention, in the first aspect, the cross-sectional shape of the core bolt is formed to be a trapezoid having a long side on the side to be welded, so that the mechanical strength is naturally improved. That is, it is possible to provide a stator for a rotating electric machine that can further facilitate the alignment of steel plates.

According to a fourth aspect of the present invention, in the first aspect, the cross-sectional shape of the core bolt is formed to be a semicircle having a radius on the side to be welded, so that the mechanical strength is reduced. A stator for a rotating electric machine that can be improved can be provided.

According to a fifth aspect of the present invention, in the first aspect, an elastic member is interposed between the support ring and the stator core, so that the work efficiency of iron core stacking is improved and the construction period is reduced. It is possible to provide a stator of a rotating electric machine capable of preventing the vibration of the stator core from being transmitted to another, as well as being capable of shortening.

According to a sixth aspect of the present invention, a step of forming a plurality of notches at predetermined intervals in a circumferential direction on each outer peripheral surface of a number of steel plates, and the position of each notch Forming a stator core by laminating each steel plate in line with each other, inserting a core bolt along the notch of each steel plate, and disposing a support ring around the stator core. The process includes the steps of fastening the stator core from the surroundings via core bolts and the step of fixing and integrating each core bolt and support ring by welding, so that the work efficiency of iron core stacking can be improved and the construction period can be shortened. It is possible to provide a method for manufacturing a stator of a rotating electric machine that is possible.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a main part of a stator of a rotating electric machine according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view showing a section taken along line II-II in FIG. 1;

FIG. 3 is a sectional view showing a section taken along line III-III in FIG. 2;

FIG. 4 is a perspective view showing a configuration of a support ring shown in FIG.

5A and 5B show a configuration of a fixing portion between a core bolt and a support ring, where FIG. 5A is a front sectional view and FIG. 5B is a side sectional view.

FIG. 6 is a diagram for explaining a method of tightening a support ring.

7A and 7B show a configuration of a fixed portion between a core bolt and a support ring of a stator of a rotating electric machine according to Embodiment 2 of the present invention, wherein FIG. 7A is a front sectional view, and FIG. 7B is a side sectional view.

FIG. 8 is a front sectional view showing a configuration different from FIG. 7 of a portion where a core bolt and a support ring of a stator of a rotary electric machine according to Embodiment 2 of the present invention are fixed.

FIG. 9 is a front cross-sectional view showing a configuration different from FIG. 7 of a fixed portion between a core bolt and a support ring of a stator of a rotary electric machine according to Embodiment 2 of the present invention.

FIG. 10 is a front sectional view showing a configuration different from FIG. 7 of a fixed portion between a core bolt and a support ring of a stator of a rotary electric machine according to Embodiment 2 of the present invention.

FIG. 11 is a perspective view showing a configuration of a stator of a conventional rotating electric machine.

12 is a cross-sectional view illustrating a configuration of a main part of a stator of the rotating electric machine in FIG. 11;

[Explanation of symbols]

11 support ring, 17 steel plate, 17a-17e notch, 18 stator core, 19, 21, 22, 23,
24 core bolts, 20 welds.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Chiharu Kawase 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term within Mitsubishi Electric Corporation (reference) 5H002 AA07 AA08 AB01 AB06 AC02 AC03 5H615 AA01 BB01 BB02 BB14 PP01 PP06 PP07 SS05 SS16 SS20

Claims (6)

[Claims] 1. A plurality of steel plates having a plurality of notches formed on a peripheral surface thereof at predetermined intervals in a circumferential direction, and formed by stacking a plurality of steel plates in a state where the positions of the notches are aligned. A stator core, a plurality of core bolts inserted along each of the cutouts, and a support ring for fastening the stator core from the surroundings via the core bolts; and A stator for a rotating electrical machine, wherein a core bolt is fixedly integrated with the support ring by welding. 2. The stator for a rotating electric machine according to claim 1, wherein the cross-sectional shape of the core bolt is formed in a rectangular shape having a long side to be welded. 3. The stator for a rotating electric machine according to claim 1, wherein the cross-sectional shape of the core bolt is formed in a trapezoid with a long side on a side to be welded. 4. The stator for a rotating electric machine according to claim 1, wherein the cross-sectional shape of the core bolt is formed in a semicircle having a radius on a side to be welded. 5. An elastic member is interposed between the support ring and the outer peripheral surface of the stator core.
The stator of the rotating electric machine described. 6. A step of forming a plurality of notches on a peripheral surface of a number of steel plates at predetermined intervals in a circumferential direction, and stacking the steel plates by aligning the positions of the notches. A step of forming a stator core by inserting a core bolt along the notch of each of the steel plates, and disposing a support ring around the stator core, and A method for manufacturing a stator for a rotating electric machine, comprising a step of fastening a stator core from the periphery and a step of fixing and integrating said core bolts and said support ring by welding.