JPH09247888A - Stator for rotating electric machine and method for manufacturing stator for rotating electric machine - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a stator for a rotating electric machine, which suppresses a reduction in the life of a bearing and is inexpensive. SOLUTION: A core 3 having a plurality of through holes 35 that are formed by stacking a plurality of steel plates and are arranged at well-balanced intervals.
Is configured. A plurality of metal rods 37 are tightly fitted into the plurality of through holes 35 of the core 3. The fitting holes 47 and 61 of the pair of brackets 9 and 11 are fitted into both end portions 71 and 87 of the metal rod 37 which project from the end surface of the core 3. Bolts 77 are inserted from the outside of the brackets 9 and 11 through the fitting holes 47 and 61, and both ends 71 and 87 of the metal rod 37 are inserted.
The male threads of the tip of the bolt 77 are screwed into the female threads 73 and 89 of the bracket 77 to attach the brackets 9 and 11 to the end surface of the core 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a rotary electric machine used in a rotary electric machine such as a motor and a method for manufacturing the stator.

[0002]

2. Description of the Related Art As a stator into which a rotor is inserted and arranged, one having brackets attached to both ends of a stator stack is used. The stator stack is constructed by winding a winding wire around a core made by stacking multiple steel plates with an insertion hole formed in the center, and the shaft of the rotor is freely rotatable by the bearings fixed to each bracket. Supported by.

In the conventional stator, the bracket is mounted by using a long mounting bolt A as shown in FIG. In the conventional structure, the bolt through hole C is formed in the bracket B on one side, and the female screw hole E is formed at the corresponding position of the bracket D on the other side, and the through hole formed in the core H from the bolt through hole C. The mounting bolt A is inserted so as to pass through F, and the male screw end G of the mounting bolt A is screwed into the female screw hole E to press the brackets B and D against the end surface of the core H. The through holes F are formed by stacking the steel plates such that the through holes formed in the steel plates are aligned with each other.

By the way, if a gap is formed between the through hole F and the mounting bolt A, the mounting bolt A is inclined with respect to the center line of the through hole F even if the mounting work is carefully performed. The brackets B and D are often attached, and in such a case, the bearing attachment portions I and J of the brackets B and D are misaligned. If the bearing mounting portions I and J of the brackets B and D are misaligned, a large radial load is applied to the bearing from the rotor shaft, which shortens the life of the bearing. Therefore, it is preferable that the gap between the through hole F and the mounting bolt A is as small as possible.
It should be designed to be the smallest size that does not hinder the insertion and rotation of the. However, it is difficult to stack the steel sheets by accurately matching the through holes of the steel sheets. Further, since a large load is applied to the core H when winding the winding wire, the through hole may be deformed, so that the substantial inner diameter of the through hole F becomes small and the attachment of the mounting bolt A is hindered. Such a situation also occurs. Therefore, conventionally, in order to prevent this, the through hole formed in each steel plate is formed to be large, and the diameter of the through hole F formed by stacking the through holes of each steel plate becomes larger than a predetermined diameter. ing. Therefore, the gap between the through hole F and the mounting bolt A exceeds 1 mm, and the mounting bolt A is inclined at an angle of 10 minutes or more with respect to the center line of the through hole F, which shortens the life of the bearing. It was the cause.

[0005]

Therefore, conventionally, in order to prevent the misalignment of the bearing mounting portions I and J of the brackets B and D due to the gap between the through hole F and the mounting bolt A, the core H of the core H is prevented. End plates L having fitting protrusions K are welded on both end faces. And in this fitting convex portion K,
Perform centering after welding. Next, the fitting recesses M and N formed in the brackets B and D are fitted into the fitting protrusion K, and then the mounting bolt A is mounted. In this case, it takes a lot of time to weld the end plate L and to perform the centering process of the fitting protrusion K, and as a result, the manufacturing cost of the stator increases. Moreover, the mounting bolt A extending from the bracket B to the bracket D has a long length and is very expensive because it is a custom-made product, which causes an increase in the price of the stator.

An object of the present invention is to provide a stator for a rotating electric machine which can prevent the life of the bearing from being shortened and is inexpensive.

Another object of the present invention is to provide a method of manufacturing a stator for a rotary electric machine, which can manufacture a stator for a rotary electric machine that can prevent a reduction in the life of a bearing at low cost. .

[0008]

In the stator for a rotating electric machine of the present invention, windings 91 are wound around a core 3 formed by laminating a plurality of steel plates. A stator for a rotary electric machine, in which a pair of brackets 9 and 11 to which bearings 55 and 69 that rotatably support a shaft 17 of the rotor are fixed are attached to both ends of a stator stack 7 configured as a target of improvement. And A plurality of through holes 35 formed in the plurality of steel plates 21 are formed in the core 3 so as to overlap each other in the stacking direction and extend in parallel with each other at intervals. A plurality of metal rods 37 having a threaded portion at both ends are provided at both ends of the plurality of through holes 35.
It is fitted tightly so that it protrudes from. The pair of brackets 9 and 11 have a plurality of fitting holes 47 and 61 into which both ends of a plurality of metal rods 37 are fitted.
Are formed respectively, and a plurality of fitting holes 47, 61 are formed.
A plurality of screwing members 77 having engaging portions 75 that engage with the brackets 9 and 11 are respectively screwed into the screw portions 73 and 89 at both ends of the plurality of metal rods 37 ... A pair of brackets 9 and 11 are attached to the stator stack 7.

Here, the metal rods 37 are not required to be fitted into the through holes of the core 3 after the core 3 is manufactured, but the through holes 35 ... In the manufacturing process of the core.
It can be read through. Therefore, it is not necessary to make the holes 25 of the steel plate 21 large in consideration of the reduction of the diameter of the through-holes 35 due to the incorrect lamination of the holes 25 of the steel plate 21. As a result, the metal rod It becomes possible to tightly fit 37 into the through holes 35. When the brackets 9 and 11 are attached to both ends of the metal rod 37 which is tightly fitted in the through hole 35, the pair of brackets are guided so that the centers of the bearing attachment portions 43 and 57 are aligned with each other. It is possible to reduce the misalignment between the bearing mounting portions 43 and 47 of the bearings 9 and 11. Therefore, without using the end plate for centering, the metal rod 3 is manufactured by manufacturing the core 3 in which the metal rods 37 are fitted, and the fitting rods 47, 61, ...
7 ... Fitting at both ends and the threaded portion 7 of the metal rod 37.
Sufficient durability can be obtained by a simple assembling work of screwing the screwing member 77 to the screws 3, 89. Also,
The metal rod 37 is much cheaper than a long mounting bolt, and even if the price of this metal rod and a low-priced short screw fastening member is added up, it is much less than the price of one long mounting bolt. . Further, the metal rods 37 act as a reinforcing member when welding the laminated steel plates 21 and when winding the winding wire 91 around the core 3, and prevent the core 3 from being deformed.
Therefore, the assembling accuracy and mechanical strength of the stator stack 7 can be improved. In addition, a plurality of through holes 47, 61
The intervals between the ... Should be formed in a balanced manner, that is, a plurality of screwing members 77, which are screwed into the metal rods 37 fitted in the through holes 35, should push the brackets 9 and 11 in a balanced manner. Is.

Such a stator for a rotary electric machine is preferably manufactured as follows. That is, after laminating a plurality of steel plates having a plurality of holes formed around the rotor insertion hole so that the holes of each steel plate are stacked in the stacking direction to form a plurality of through holes extending in parallel to each other, A plurality of metal rods having threaded portions formed at both ends of the plurality of through holes are tightly fitted to each other so that both ends thereof protrude from the through holes to form a core molded body. Next, a steel plate bonding process for bonding a plurality of steel plates forming the core molded body to each other is performed to form a core, and windings are wound around the core to form a stator stack. Then, a pair of brackets having a plurality of fitting holes into which both ends of the plurality of metal rods are fitted are attached to both ends of the plurality of metal rods protruding from both ends of the core. And place them on both ends of the core. Next, by screwing a plurality of screw-fastening members each having an engaging portion that engages with the bracket, to the screw portions at both ends of the plurality of metal rods fitted in the plurality of fitting holes,
Attach a pair of brackets to the stator stack.

It is preferable that the through holes 35 of the core 3 have a diameter substantially equal to the outer diameter of the metal rods 37. Specifically, the metal rod 37 ... and the through hole 35.
A gap between the metal rod and the metal rod is allowed to be inserted into the through hole, but the metal rod does not fall out under its own weight. This gap preferably has an average value of 0.06 mm or less. Through hole 35
This is because if the difference between the diameter of ... And the outer diameter of the metal rod 37 exceeds 0.06 mm on average, there is a risk of misalignment that shortens the life of the bearing. The difference between the diameter of the through holes 35 and the outer diameter of the metal rods 37 is preferably 0.02 mm or more on average. If the average value is less than 0.02 mm, it takes time to insert the metal rods 37 ...

The threaded portions at both ends of the metal rods 37 ... May be male or female. When the threaded portion is a male threaded portion, the male threaded portion must be fitted into the bracket sufficiently long, so that the amount of protrusion from both end surfaces of the core of the metal rod becomes large. However, if the amount of protrusion of both ends of the metal rod is large, the winding cannot be smoothly wound around the core. Further, it is costly to process the male screw portion on the metal rod 37. Therefore, it is preferable that the threaded portions at both ends of the metal rod are formed as female threaded portions 73 and 89, and the screwing members 77 screwed to the both end portions are male screw members with a head 75.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing the configuration of an AC servomotor using a stator for a rotating electric machine according to the present invention. The AC servomotor 1 includes a stator stack 7 in which an insulating bobbin 5 is fitted on a core 3 and windings 91 are wound on the core 3, and brackets on one side attached to both sides of the stator stack 7. 9 and a stator 2 composed of the bracket 11 on the other side. Further, the pair of brackets 9 and 11 has a rotor 19 rotatably supported on both sides of the shaft 17 so that the main body 13 is arranged in the insertion hole 15 of the core 3.

The core 3 is formed in an annular body in which the main body 13 of the rotor 19 can be housed inside, and is formed by laminating a plurality of steel plates 21 as shown in FIG. The steel plate 21 has cutout recesses 23 at four corners of the outer circumference, and through holes 25 are formed on both sides of each cutout recess 23. Further, a large number of stator pole portion forming convex portions 27 arranged at equal intervals in the circumferential direction extend from the inner peripheral portion of the steel plate toward the center. All the protrusions 27 are formed in the same shape having a wide portion 29 at the inner end, and the insides of these protrusions surround a circular insertion hole 31.

In order to construct the core 3, first, a plurality of steel plates 21 are aligned so as not to be displaced to be in a laminated state. When the steel plates 21 are stacked, the through holes 25 are overlapped with each other to form eight through holes 35 (FIG. 1) that extend in parallel with each other at intervals. A metal rod 37 is provided in each through hole 35.
Are inserted so that both ends project from both ends of the core 3 by substantially the same length to form a core molded body. In this example, since the diameter of the through hole 25 formed in each steel plate 21 is formed to be larger than the outer diameter of the metal rod 37 by 0.05 mm, a space between the through hole 35 and the metal rod 37 is formed. The average gap is about 0.05 mm,
The metal rod 37 is tightly fitted in the through hole 35. Next, the laminated steel sheet of the core molded body is held under pressure from both sides in the laminating direction, an adhesive is applied to the outer peripheral surface of the laminated steel sheet, and after the adhesive is hardened, the steel sheet 21 is connected in the laminating direction. Thus, the outer peripheral surface of the laminated steel plates is welded to form the core 3. When performing the steel plate joining process, since the adhesive is applied to the entire outer peripheral surface of the laminated steel plates prior to welding, it is possible to effectively prevent the non-welded portion from being deformed and to make the core 3 waterproof. be able to. In addition,
To fit the steel plate 21 and the metal rod 37, all the metal rods 37 are arranged in a predetermined state and the metal rod 3
7 may be fitted with the steel plates 21 one by one, or one or more metal rods 37 may be fitted with the steel plates 21 one by one.
After fitting all the steel plates 21, the steel plates 21 are aligned so that the through holes 25 overlap so that they do not shift, and the through holes 35 formed by overlapping the through holes 25 are made of the remaining metal. The rod 37 may be inserted.

The core 3 has a stator magnetic pole 41 formed by overlapping the stator pole portion forming convex portions 27 of the steel plate 21, and by winding the winding 5 around the stator magnetic pole 41, the status is obtained. The tack 7 is configured.

The bracket 9 on one side is formed in a cap shape having the same outer peripheral shape as the steel plate 21 (see FIG. 3).
Is a side view of the bracket 9), and the mounting inner cylindrical portion 43 is provided at the center.
(Bearing mounting part) is provided. Bracket 9
Two fitting holes 4 penetrating in the thickness direction at the two corners of the concave portion 45 formed on the back surface side at the four corners of the
7 (8 in total) are formed. This fitting hole 47
Has a large diameter portion 47a on the outer side in the axial direction (on the side opposite to the stator stack 7) and on the inner side in the axial direction (on the stator stack 7).
Side), a small diameter portion 47b having a smaller diameter dimension than the large diameter portion 47a.
Further, a large diameter portion 47c having a larger diameter dimension than the small diameter portion 47b is provided inside the small diameter portion 47b. Each fitting hole 47 is formed so as to correspond to the through hole 35 of the core 1. Mounting holes 49 are provided between the two fitting holes 47 at the four corners of the bracket 9. This mounting hole 49 is used for mounting the motor. Bracket 9
In the mounting portion of the cylindrical hole 57 of the mounting inner cylindrical portion 43 of the bearing mounting ring 5 inserted when the bracket 9 is cast.
3 is fixed, and a radial bearing 55 is fitted to this bearing mounting ring 53.

The bracket 11 on the other side is formed in a cap shape having the same outer peripheral shape as the steel plate 21 (FIG. 4 shows a side view of the bracket 11) and has a mounting inner cylindrical portion 57 (bearing) at the center. Mounting part) is provided. Notch recesses 59 are formed at the four corners of the bracket 11, and a pair of fitting holes 61 that penetrate in the thickness direction are formed on both sides of the notch recess 59. These fitting holes 61 have a large diameter portion 61a on the outer side in the axial direction (the side opposite to the stator stack 7), and a small diameter portion having a smaller diameter dimension than the large diameter portion 61a on the inner side in the axial direction (on the stator stack 7 side). 61b, and the small diameter portion 61b is further provided inside thereof.
It has a large-diameter portion 61c having a larger diameter. These fitting holes 61 are formed so as to correspond to the through holes 35 of the core 1. Further, on the outer peripheral portion of the bracket 11, a lead wire lead-out portion 63 for drawing out a lead wire connected to the winding wire 91 is provided. A bearing mounting ring 67 inserted when the bracket 11 is cast is fixed to a mounting portion of the cylindrical hole 65 of the mounting inner cylindrical portion 57, and a radial bearing 69 is mounted to the bearing mounting ring 67.

The brackets 9 and 11 are attached to the stator stack 7
To attach to the large diameter portion 4 of the fitting hole 47 of the bracket 9
7c is a metal rod 3 protruding from one end surface of the core 3
One end 71 of 7 is fitted. And the metal rod 37
A male screw portion 79 formed at the tip portion of a bolt 77 inserted from the large diameter portion 47 a of the fitting hole 47 of the bracket 9 is screwed into the female screw portion 73 formed at the one end portion 71 of the. In this state, the head portion 75 of the bolt 77 is fitted in the large diameter portion 47 a of the fitting hole 47. Since the head portion 75 of the bolt 77 has a driver slot for enabling screw tightening, the head portion 75 can be fitted in the large diameter portion 47a of the fitting hole 47.

Thereafter, the radial bearing 55 mounted on the bracket 9 is attached to the shaft 17 of the rotor 19.
, And then the radial bearing 55 is fitted to the bearing mounting ring 53 of the bracket 9. The main body 13 of the rotor 19 is composed of a permanent magnet 81 fixed to the shaft 17 and a pair of magnetic pole caps 83 and 85 fitted on both sides of the permanent magnet 81. The outer circumference of the stator pole 41 is the core 1
It is arranged in the insertion hole 15 so as to have a slight gap with the inner end of the. A radial bearing 69 is fitted to the other end of the shaft 17 of the rotor 19, and the bearing mounting ring 67 of the bracket 11 is inserted outside the radial bearing 69. Then, the large diameter portion 61c of the fitting hole 61 is fitted to the other end portion 87 of the metal rod 37 protruding from the other end surface of the core 3. Then, an internal thread portion 89 formed on the other end portion 87 of the metal rod 37.
Then, the male screw portion 79 formed at the tip of the bolt 77 inserted through the fitting hole 61 is screwed. These bolts 7
The head portion 75 of 7 is also fitted to the large diameter portion 61 a of the fitting hole 61. A driver slot is formed in the head portion 75. The bracket 11 is attached to the core 3 by the bolt 77.

Both the brackets 9 and 11 are fitted to both ends of the metal rod 37, and then the bolts 77 are screwed into the female screw portions 73 and 89 of both ends of the metal rod 37 to thereby bracket the brackets 9 and 11. May be attached to the core 3.

In the above example, the present invention is applied to an AC servo motor, but the present invention is a stepping motor, D
It can be applied to various rotary electric machines such as C motors.

Next, the constituent features of some inventions among the plurality of inventions described in this specification will be listed.

(1) Core 3 formed by laminating a plurality of steel plates
Stator stack 7 constructed by winding winding 91 around
A method of manufacturing the core 3 of the stator for a rotary electric machine, wherein a pair of brackets 9 and 11 to which bearings 55 and 69 that rotatably support the shaft 17 of the rotor are fixed are attached to both ends of A plurality of steel plates 21 each having a plurality of holes 25 formed around the rotor insertion hole are stacked in the stacking direction of the holes 21 of each steel plate to form a plurality of through holes 35 extending in parallel with each other. , And then the brackets 9 and 11 are formed on both ends of the plurality of through holes 35.
A plurality of metal rods 37 with threaded portions 73 and 89 used for screwing are tightly fitted to each other so that both ends thereof protrude from the through holes 35 to form a core molded body. A method for manufacturing a core, characterized in that the core 3 is produced by performing a steel plate bonding process for bonding the plurality of steel plates 21 forming the core molded body to each other.

(2) In the steel plate joining process, the core compact is held under pressure from both sides of the steel plates in the stacking direction, and in this state, an adhesive is applied to the outer peripheral surface of the core compact,
The core manufacturing method according to (1), wherein after the adhesive is cured, the outer peripheral surface of the core molded body is continuously welded in the stacking direction so as to bond the plurality of steel plates to each other.

(3) Core 3 formed by laminating a plurality of steel plates
Stator stack 7 constructed by winding winding 91 around
And a pair of brackets 9 and 11 to which bearings 55 and 69 that rotatably support the shaft 17 of the rotor are fixed, are provided at both ends of the rotor. , A plurality of steel plates having a plurality of holes formed around the rotor insertion hole, after laminating the holes of each steel plate in the stacking direction to form a plurality of through holes extending in parallel to each other, The plurality of through holes 35 ...
Multiple metal rods 3 with threaded parts on both ends
7 ... are tightly fitted to each other so that both ends thereof protrude from the through hole to form a core molded body, and a steel plate bonding process for bonding the plurality of steel plates forming the core molded body to each other is performed. The core 3 is made, the winding 91 is wound around the core 3 to make the stator stack 7, and a plurality of fitting holes into which the both ends of the plurality of metal rods 37 are fitted. One of the pair of brackets 9, 11 provided with 47, 6 is fitted with the plurality of fitting holes at one end of one of the plurality of metal rods protruding from one end of the core 3. Attached to the one end of the core,
A plurality of screw fastening members 77 each having an engaging portion that engages with the bracket is attached to a screw portion of the one end portion of the plurality of metal rods fitted in the plurality of fitting holes. By screwing, one of the pair of brackets is attached to the stator stack 7, the bearings are attached to both ends of the shaft 17, and the bearing attached to one end of the shaft 17 of the rotor is attached to the pair of brackets. While supporting one of the brackets 9 and 11 and fitting the rest of the pair of brackets to the other end of the other of the plurality of metal rods protruding from the other end of the core, the plurality of fitting holes are fitted. , The plurality of metal rods 3 fitted in the plurality of fitting holes, with bearings attached to the other end of the shaft being supported by the remaining brackets and attached to the other end of the core A plurality of screw fastening members each having an engaging portion that engages with the bracket are respectively screwed into the screw portion of the other end portion of ... And the remaining brackets of the pair of brackets are attached to the stator stack 7. A method of manufacturing a rotating electric machine, characterized in that the rotating electric machine is attached.

[0027]

As described above, according to the stator for a rotary electric machine of the present invention, it is possible to suppress the decrease in the life of the bearing and to manufacture it at low cost. Further, by using the method for manufacturing a stator for a rotary electric machine according to the present invention, it is possible to manufacture a stator for a rotary electric machine at a low cost while suppressing a decrease in the life of the bearing and using inexpensive parts.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of an example of an AC servomotor using a stator for a rotary electric machine according to the present invention.

FIG. 2 is a diagram showing a steel plate used in the example of FIG.

3 is a side view of a bracket on one side used in the example of FIG. 1. FIG.

4 is a side view of the other side bracket used in the example of FIG. 1. FIG.

FIG. 5 is a cross-sectional view showing the structure of a conventional stator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC servo motor (rotary electric machine) 2 Stator 3 Core 5 Winding 7 Stator stack 9,11 Bracket 17 Shaft 19 Rotor 21 Steel plate 25 Through hole 35 Through hole 37 Metal rod 47, 61 Fitting hole 55, 69 Radial bearing 73,89 Female thread 77 Bolt

Claims (5)

[Claims] 1. A pair of brackets in which bearings that rotatably support a shaft of a rotor are fixed to both ends of a stator stack configured by winding a winding around a core formed by laminating a plurality of steel plates. In the stator for a rotating electric machine, the holes are formed in the plurality of steel plates in the core so as to overlap each other in the stacking direction, and a plurality of through holes extending in parallel with each other are provided at intervals. A plurality of metal rods having threaded portions at both ends are tightly fitted to the plurality of through holes so that the both ends protrude from the through hole. A plurality of fitting holes into which the both ends of the plurality of metal rods are fitted are respectively formed in the pair of brackets, and the plurality of fitting holes fitted in the plurality of fitting holes are formed. Book of metal A plurality of screw-fastening members each having an engaging portion that engages with the bracket are respectively screwed into the threaded portions at both ends of the bracket, and the pair of brackets are attached to the stator stack. A stator for a rotating electric machine characterized by. 2. The insertion of the metal rod into the through hole is allowed between the metal rod and the through hole, but the metal rod does not fall out under its own weight. The stator for a rotary electric machine according to claim 1, wherein a gap is formed. 3. The stator for a rotating electric machine according to claim 2, wherein the average value of the gap is 0.06 mm or less. 4. A pair of brackets having bearings for rotatably supporting a shaft of a rotor fixed to both ends of a stator stack formed by winding windings around a core formed by laminating a plurality of steel plates. Is a stator for a rotating electric machine, in which holes formed in the plurality of steel plates are formed in the core so as to overlap each other in the stacking direction, and a plurality of through holes extending in parallel to each other are balanced. A plurality of metal rods, which are formed at intervals and have female screw portions formed at both ends in the plurality of through holes, are tightly fitted so that the both ends project from the through hole. The pair of brackets are respectively formed with a plurality of fitting holes into which both ends of the plurality of metal rods are fitted, and the brackets are fitted into the plurality of fitting holes. The compound Male threaded portions of a plurality of screw members with heads inserted from the outside of the fitting hole are screwed into female threaded portions of both ends of a metal rod of a book, and the pair of brackets forms the stator stack. A stator for a rotating electric machine, characterized in that it is attached to. 5. A pair of brackets in which bearings for rotatably supporting a shaft of a rotor are fixed to both ends of a stator stack formed by winding a winding around a core formed by laminating a plurality of steel plates. A method for manufacturing a stator for a rotating electric machine, in which a plurality of steel plates each having a plurality of holes formed around a rotor insertion hole are stacked in parallel in the stacking direction. After stacking so as to form a plurality of through-holes extending to each of the plurality of through-holes, a plurality of metal rods having screw portions formed at both ends of the plurality of through-holes respectively project from the through-holes at the both ends. To form a core molded body by tightly fitting the steel molded body to each other, and to form the core by performing a steel plate bonding process for coupling the plurality of steel plates forming the core molded body to each other. The stator stack The pair of brackets having a plurality of fitting holes into which the both ends of the plurality of metal rods are fitted, the both ends of the plurality of metal rods protruding from both ends of the core. So that the plurality of fitting holes are fitted to the parts, and are arranged at both ends of the core, and to the screw parts of the both ends of the plurality of metal rods fitted in the plurality of fitting holes. A method for manufacturing a stator for a rotary electric machine, wherein a plurality of screw fastening members each having an engaging portion that engages with the bracket are screwed together to attach the pair of brackets to the stator stack. .