WO2017187522A1

WO2017187522A1 - Stator, electric motor, stator manufacturing method, and electric motor manufacturing method

Info

Publication number: WO2017187522A1
Application number: PCT/JP2016/063088
Authority: WO
Inventors: 康友生方; 治之長谷川; 丈典馬場
Original assignee: 三菱電機株式会社
Priority date: 2016-04-26
Filing date: 2016-04-26
Publication date: 2017-11-02
Also published as: TWI620398B; JPWO2017187522A1; JP6207769B1; TW201739146A

Abstract

A stator is provided with: a tooth portion (5) around which a coil is wound and fixed; and a core back portion (3a, 3b) having one end connected through a thin connection portion (1a, 1b) to the tooth portion (5) and constituting a magnetic path. It is possible for the tooth portion (5) and the core back portion (3a, 3b) to have an open state and a closed state by opening and closing the thin connection portion (1a, 1b). In the open state, the tooth portion (5) and the core back portion (3a, 3b) form an acute angle; in the closed state, the tooth portion (5) and the core back portion (3a, 3b) abut on each other and form an acute angle.

Description

Stator, electric motor, method for manufacturing stator and method for manufacturing electric motor

The present invention relates to a stator, an electric motor, a method for manufacturing a stator, and a method for manufacturing an electric motor, and more particularly to mounting of a coil on a stator.

Conventionally, a stator of an electric motor usually includes a core core, a teeth portion, a stator core having a slot surrounded by the core back portion and the teeth portion, and a coil wound separately around the teeth portion. Prepare. The core back portion is also called a yoke portion and refers to a wide portion outside the teeth portion around which the coil is wound. There is also a stator having a tip yoke portion inside.

In the stator of an electric motor, increasing the space factor of the coil, that is, the winding density, is an important issue for improving the performance. For this purpose, it is required to optimize the magnetic path in the armature core, reduce the iron core portion constituting the useless magnetic path, and wind the coil there.

It is known that when the shape of the core back portion constituting the magnetic path is optimized, an undercut portion is generated at the base of the core back portion and the tooth portion. An undercut part is an area | region formed in the part which a core back part and a teeth part cross at an acute angle under a core back part.

A conventional general winding method is a nozzle winding method in which winding is performed while a winding nozzle rotates around the stator core, and this nozzle winding method is fast and simple. Can be wound. However, the undercut portion cannot be wound, and it has been difficult to improve the coil space factor of the winding.

As a method of performing winding to the undercut portion, for example, as shown in Patent Document 1, a method of performing winding by changing the winding nozzle angle depending on the winding position is disclosed.

In addition, as an iron core structure that can improve the space factor by using a general-purpose winding machine, as shown in Patent Document 2, the teeth part and the outer peripheral part are joined in an L shape via a thin part. A technique is disclosed in which a plurality of the above-mentioned components are combined in a ring shape to obtain a stator that can be easily mounted with a winding on a tooth portion.

JP-A-10-136620 JP 2003-134701 A

However, according to the conventional iron core structure described in Patent Document 1, a special winding machine is required, which is more expensive than the general-purpose winding machine and complicated in controlling the winding.

According to the conventional iron core structure described in Patent Document 2, since the initial position of the core back is located approximately 90 ° from the final shape position, the amount of iron core deformation when closing the core back is large, and the thin core Part strength is required. Moreover, the processing accuracy at the time of iron core manufacture and the bending accuracy of a core back are calculated | required.

Also, with respect to Patent Document 2, since the air-core coil wound around the bobbin is inserted into the iron core, the bobbin strength is required. Therefore, the space factor decreases as the bobbin thickness increases. Further, since the accuracy of the air-core coil is required, there is a problem that the bobbin manufacturing accuracy or the tension control of the winding machine is required.

The present invention has been made in view of the above, and an object of the present invention is to obtain a stator having a high winding space factor and easy to manufacture.

In order to solve the above-described problems and achieve the object, the stator according to the present invention has a tooth portion around which a winding is wound, and one end portion connected to the tooth portion via a thin connection portion, A plurality of split iron cores having a core back portion constituting a magnetic path are provided. The teeth part and the core back part can contact each other with a thin connection part arranged between the teeth part and the core back part as a fulcrum, and the teeth part and the core back part form an acute angle at the contact part. Features.

According to the present invention, a stator having a high winding space factor and easy to manufacture can be obtained.

Sectional drawing which shows the split iron core of the stator for electric motors of Embodiment 1 Sectional drawing which shows the state before mounting | wearing with the winding of the split iron core of the stator of FIG. (A) to (c) are enlarged views of the main part of the split core of the stator according to the first embodiment, (a) is a cross-sectional view, (b) is a cross-sectional view along IIIb-IIIb in (a), (C) is a sectional view taken along line IIIc-IIIc in (a). Explanatory drawing which shows the electric motor using the stator of Embodiment 1. Process sectional drawing which shows the manufacturing process of the stator of Embodiment 1 Process sectional drawing which shows the manufacturing process of the stator of Embodiment 1 Process sectional drawing which shows the manufacturing process of the stator of Embodiment 1 The perspective view of the stator of Embodiment 1 The flowchart which shows the manufacturing process of the stator of Embodiment 1. Sectional drawing which shows the split iron core of the stator of Embodiment 2. Sectional drawing which shows the split iron core of the stator of Embodiment 3 Sectional drawing which shows the split iron core of the stator of Embodiment 4. Sectional drawing which shows the electric motor using the stator of Embodiment 4. Sectional drawing which shows the split iron core of the stator of Embodiment 5 Sectional drawing which shows the electric motor using the stator of Embodiment 5.

Hereinafter, a stator, an electric motor, a stator manufacturing method, and an electric motor manufacturing method according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the present embodiment, and can be appropriately changed without departing from the gist of the present invention. In the drawings shown below, the scale of each member may be different from the actual scale for easy understanding. The same applies between the drawings. Further, even a plan view may be hatched to make the drawing easy to see. On the other hand, even a cross-sectional view may not be hatched for easy viewing of the drawing.

Embodiment 1 FIG.
1 is a cross-sectional view showing a split iron core of a stator for an electric motor according to Embodiment 1. FIG. 2 is a cross-sectional view showing a state before the winding of the split core of the stator of FIG. 1 is mounted. 3 (a) to 3 (c) are enlarged views of the main part of the split core of the stator according to the first embodiment. FIG. 3 (a) is a cross-sectional view, and FIG. FIG. 3C is a sectional view taken along line IIIc-IIIc in FIG. FIG. 4 is an explanatory view showing an electric motor using the stator of the first embodiment.

The stator of the motor of the first embodiment is one characterized by the configuration of the split core 10 _d. The split iron core 10 _d constituting the stator includes

core connection portions

3 a and 3 b and a tooth portion 5 that are connected to each other with the

thin connection portions

1 a and 1 b and the

grooves

2 a and 2 b interposed therebetween. A winding 6 is wound and fixed on the tooth portion 5. The teeth part 5 and the

core back parts

3a and 3b can be opened or closed by opening and closing the

grooves

2a and 2b in which the

thin connection parts

1a and 1b are formed. The teeth portion and the core back portion can be rotated and contacted with the thin

wall connecting portions

1a and 1b arranged between the teeth portion 5 and the

core back portions

3a and 3b as fulcrums. The part makes an acute angle at the contact part.

As shown in FIG. 1, the stator core 10 _{d according} to the first embodiment has the teeth portion 5 and the

core back portions

3 a and 3 b in contact with each other in the closed state, and the center of the teeth portion that is the center line of the teeth portion 5. An angle θ _c formed by the line 5 _o and the core back part center line 3 _o which is the center line of the

core back parts

3a and 3b is a right angle. The angle θ _c formed with the core back part center line 3 _o is precisely the angle formed between the teeth part center line 5 _o and the tangent line of the core back part center line 3 _{o at} the intersection. The

core back portions

3a and 3b are in a closed state, and there are no two

grooves

2a and 2b. The two

thin connection portions

1a and 1b are absorbed by the notches 1s. In FIG. 1, the angle θ _co formed by the

core back portions

3 a, 3 b and the teeth portion 5 in the

core back portions

3 a, 3 b and the tooth portion 5 is an acute angle and forms the

undercut portions

4 a, 4 b. The angle θ _co formed by the

core back portions

3a, 3b and the tooth portion 5 at the contact portion between the

core back portions

3a, 3b and the tooth portion 5 is the inner angle of the

core back portions

3a, 3b at the inner edge of the contact portion. The angle formed between the circumference and the side of the teeth portion 5 shall be said. Also here, since the inner peripheries of the

core back portions

3a and 3b are circular arcs, the angle formed between the tangent line at the inner edge as a contact point and the side of the teeth portion 5 is determined between the

core back portions

3a and 3b and the teeth portion 5. The formed angle θ _co is assumed.

On the other hand, as shown in a state immediately after punching segment core 2, in the open state, the tooth portion 5 and the core-

back portion

3a, 3b is formed between the tooth portion centerline 5 _o and the core-back centerline 3 _o The angle θ _o forms an obtuse angle. That is, the angle formed between the core back

portions

3a and 3b and the tooth portion 5 is an obtuse angle. The notch 1s is an escape portion at the time of folding, and becomes a surplus absorption region at the time of folding. 3 (a) to FIG. 3 (c) are enlarged views of main parts around the

thin connection portions

1a and 1b in the open state. As shown in FIG. 3C, the teeth portion 5 and the core back

portions

3a and 3b are separated by

grooves

2a and 2b as a whole, but a part is shown in FIG. 3B. In addition, a connecting portion composed of the thin-walled connecting

portions

1a and 1b is formed and connected. The depth of the

grooves

2a and 2b, that is, the connecting width of the connecting portion and the thickness of the thin connecting

portions

1a and 1b are determined in consideration of satisfying both the connecting strength and the ease of bending. 3 (b) and 3 (c), only the boundary between the tooth portion 5 and the core back portion 3a is shown, but the thin-walled connecting

portions

1a, 1b and the

grooves

2a, 2b are formed in the teeth portion center line 5 _O. The connection strength and the ease of folding are equal on both sides.

As shown in FIG. 4, the electric motor 100 constitutes a stator 10 by connecting a plurality of T-shaped split cores 10 _d including core back

portions

3 a and 3 b and a tooth portion 5 to form a cylindrical shape. The rotor 20 is arranged at the center surrounded by the stator.

The split core 10 _d is formed by stacking a plurality of split core structures made of electromagnetic steel plates. In the stator of the electric motor according to the first embodiment, the winding 6 is wound around the tooth portion 5 of each divided core 10 _d constituting the stator core via an insulating member (not shown).

The axial direction of the tooth portion 5 of the divided iron core 10 _d , that is, the both end portions in the direction of the tooth center line 5 _O and the side wall portions are covered with a non-expandable insulating member formed of insulating paper or insulating coating. The winding 6 is wound around the tooth portion 5 from above the insulating member.

The nine split iron cores 10 _d in which the winding 6 is wound around the tooth portion 5 and the outer side of the wound winding 6 is covered with a thermosetting resin as necessary are connected to the

thin connection portions

1a and 1b. The

grooves

2 a and 2 b disappear, and the core back

portions

3 a and 3 b are brought into close contact with and fixed to the tooth portion 5. FIG. 4 is a view showing an electric motor having a cylindrical stator core. A frame (not shown) is attached to the outside of the cylindrical stator core in the radial direction, and an electric motor including the stator core is formed.

Next, a method for manufacturing the stator according to the first embodiment will be described. 5 to 7 are process cross-sectional views showing the manufacturing process of the stator according to the first embodiment, FIG. 8 is a perspective view of the stator according to the first embodiment, and FIG. 9 is a perspective view of the stator according to the first embodiment. It is a flowchart which shows a manufacturing process. First, in step S101 for forming the core in the open state in FIG. 9, as shown in FIG. 5, the teeth portion 5 and the core back

portions

3a and 3b are brought into contact with the teeth portion center line _5o and the core back portion center by pressing. A divided core structure in which an angle θ _o formed with the line 3 _o forms an obtuse angle is formed. The teeth portion 5 and the core back

portions

3a and 3b are generally separated by the

grooves

2a and 2b, but a part of the connecting portion is formed by the thin-walled connecting

portions

1a and 1b. ing. In step S102 of laminating the core, it assembled the division core structure obtained by thin punching, to form the segment core 10 _d. Thereafter, the assembled divided core 10 _d is subjected to an insulation treatment between the ground. As the insulating treatment is processed to be attached to portions corresponding to both ends of the shaft i.e. the tooth centerline 5 _o direction of the split core 10 _d and the insulating member. In addition to this, a process of applying an insulating coating to the entire divided core 10 _d or a process of attaching an insulating paper as an insulating member to the side surface of the divided core 10 _d can be cited as the insulating process. Furthermore, two or more of the plurality of processes described above may be combined to form an insulation process.

Subsequently, in step S103 of winding the coil in FIG. 9, as shown in FIG. 6, by winding the winding 6 of coated conductor with an insulating material on the tooth portion 5 of the segment core 10 _d, The coil is mounted over the entire width of the teeth portion 5 as a coil. Note that the surface of the winding 6 is insulated by forming a coating made of a copper wire with an insulating material coating, in this embodiment, an enamel coating. The conducting wire constituting the winding 6 is not limited to copper, but may be a conducting wire constituted by a conductor.

Next, in step S104 for closing the core of FIG. 9, the

thin connection portions

1a and 1b are folded and the

grooves

2a and 2b are eliminated, and as shown in FIG. 3b is brought into close contact. FIG. 8 is a perspective view of the split iron core 10 _d in which the winding 6 is wound and closed. The split iron core 10 _d has a shape in which the core back

portions

3 a and 3 b are in close contact with the tooth portion 5 to form a magnetic path desirable for incorporation into the electric motor 100. In FIG. 8, an arrow A indicates the stacking direction of the divided cores. The divided cores 10 _d thus obtained are fixed by welding nine adjacent core back

portions

3a, 3b to form a cylindrical shape as shown in FIG. The motor 100 is obtained by mounting components such as the rotor 20.

According to the stator of the first embodiment, in the open state, at the contact portion between the core back

portions

3a and 3b and the tooth portion 5, the coil turns in any of the split iron cores make an obtuse angle with respect to the tooth portion. Since the space is open, the winding can be mounted by a general winding method. The winding can be carried out with good workability in a form that matches the shape of the undercut portion that is formed when the iron core is bent later. The space factor can be improved by arranging a coil in the undercut portion of the split iron core. The split iron core is molded so that the angle formed between the core back portion and the teeth portion is an obtuse angle in a form in which a thin connection portion and a groove are provided in the core back portion. Thereby, even if it is a conventional winding machine, it becomes possible to fix a coil | winding in the site | part which hits an undercut.

The open teeth portion, thin connection portion, and core back portion are formed at an angle that can be wound by the winding, so that the thickness of the thin connection portion can be reduced, so that a gap is generated when bent. Can be suppressed. In consideration of strength, two or more thin connection portions may be disposed in one groove. By providing thin connection portions at both ends of the groove, the flatness can be maintained by bending the inner side and the outer side of the divided core. In addition, after fixing the winding, the core back part is formed in the desired shape by bending the thin connection part of the split core, but the amount of deformation due to bending can be minimized, so cracking of the thin connection part Hard to occur. Therefore, it is not necessary to use a high-strength material as the split core material, and it is possible to suppress breakage during bending or biting of foreign matter. It is also effective in improving efficiency.

In Embodiment 1, the split iron core is molded by press working, but may be manufactured by a method such as wire cutting or cutting with a laser cutter.

Embodiment 2. FIG.
FIG. 10 is a cross-sectional view showing a split core of the stator according to the second embodiment. In the first embodiment, the

thin connection portions

1a and 1b are formed in directions extending from each other at an acute angle from the notch 1s. However, as the second embodiment, the

thin connection portions

11a and 11b are separated by two. An example provided will be described. The notch 11s constitutes an escape portion during bending, similar to the notch 1s of the first embodiment.

Segment core 10 _d constituting the stator of the motor of the second embodiment, the thin-walled connecting section 11a spaced from each other, 11b and connected across the groove 12a, a 12b, the core back

portion

13a, 13b And a teeth portion 15. A winding (not shown) is wound and fixed on the tooth portion 15. The teeth part 15 and the core back

parts

13a and 13b can be opened and closed by opening and closing the

thin connection parts

11a and 11b, as in the first embodiment.

In the closed state, the split core 10 _d of the stator of the second embodiment is the same as that of the first embodiment, and the tooth portion 15 and the core back

portions

13a and 13b come into contact with each other, and the tooth portion center line 5 _O and the core back The angle formed by the part center line 3 _O forms an acute angle.

According to the thin connecting portion of the split core of the stator of the electric motor according to the second embodiment, the amount of core back deformation after winding can be reduced compared to the thin connecting portion of the first embodiment. Further, when three or more thin connection portions and groove portions are provided in the core back portion, the deformation amount per one can be further suppressed.

Embodiment 3 FIG.
In the first embodiment, the insulation treatment of the divided iron core 10 _d is performed after winding, but in the third embodiment, a divided bobbin in which a slit 7 s is inserted between the core back

portions

3 a and 3 b and the tooth portion 5. By using, the bobbin can be attached before winding. As shown in FIG. 11 in which the split iron core is in the open state, the teeth portion 5 and the core back

portions

3a and 3b are attached to each other, and in the closed state, the core back bobbins 7a1 and 7a2 and the teeth bobbins 7b1 and 7b2 that are in contact with each other Is the one that is attached. Others are the same as the split iron core of Embodiment 1.

According to the split iron core of the stator of the electric motor according to the third embodiment, in addition to the effect obtained by the split iron core according to the first embodiment, it is not necessary to perform insulation treatment after winding, so that the number of manufacturing steps can be reduced. . Further, the insulating component is not limited to the bobbin, and a molded body made of an insulating thin film such as a slot cell may be used.

Embodiment 4 FIG.
Segment core 10 _d of the first embodiment are formed separately, after winding, and the thin connection part in the closed state, by fixing by nine sequences has formed the stator, embodiment 4 Then, it forms in the state which connected 10 s of division | segmentation core parts which consist of nine division | segmentation iron core structures. As shown in FIG. 12, the divided iron core portion 10 s includes the thin-

wall connecting portions

1 a and 1 b and the core back

portions

3 a and 3 b and the tooth portion 5 that are connected with the

grooves

2 a and 2 b interposed therebetween. A winding is wound around the tooth portion 5. The teeth part 5 and the core back

parts

3a and 3b can be opened and closed by opening and closing the

thin connection parts

1a and 1b.

As shown in FIG. 12, the core back

portions

3a and 3b have their outer edges in a straight line in the open state, but the thin

core connection portions

1a and 1b and the

grooves

2a and 2b are sandwiched between the individual divided core portions 10S. Thus, it has the same shape as that of the first embodiment.

Since the adjacent core back

portions

3a and 3b are continuously formed and the nine divided core portions 10s are continuously formed on one straight line, they are the same as in the first embodiment. Omitted.

In the step of winding the coil, the teeth portion 5 and the core back

portions

3a and 3b are obtuse angles that are about 5 to 10 degrees larger than the right angle in the open state, and thus can be easily wound. The windings 6 may be mounted by warping the

grooves

2a and 2b to be further expanded. Then, by closing the nine divided iron core portions 10s in the connected state after the winding is mounted, the stator 10 having an annular iron core as shown in FIG. 13 is formed. After that, as in the first embodiment, the same electric motor as in the first embodiment can be obtained by mounting the rotor 20.

According to the fourth embodiment, since the split core portion can be formed in a lump, not only the assembly workability is greatly improved, but the split core portion is formed so that the outer edge of the core back portion is generally on a straight line. In addition, since the connecting portion is unnecessary, the divided core material can be greatly saved. Moreover, since there are few connection parts, a magnetic path is formed as designed.

Embodiment 5 FIG.
FIG. 14 is a cross-sectional view showing a split core of the stator according to the fifth embodiment, and FIG. 15 is a cross-sectional view showing an electric motor 100S using the stator according to the fifth embodiment. In Embodiment 4, it formed in the state which connected 10 s of division | segmentation iron core parts which consist of nine division | segmentation iron core structures. On the other hand, in the stator of the fifth embodiment, the iron core is made into a number of connecting structures so that the outer edge of the teeth portion 5 is positioned in a straight line in the open state and the teeth portion 5 in the closed state. It is comprised so that the outer edge of may become a state close | similar to circular.

According to the fifth embodiment, since the outer edge of the tooth portion 5 is in a state of being nearly circular, the magnetic characteristics of the iron core configured by the connection structure of the divided core portion 10s is compared with the stator of the fourth embodiment. Further improvement can be achieved. Further, the waste of the iron core material can be reduced, and the iron core material can be further saved.

In the first to fifth embodiments, the teeth portion and the core back portion are configured to have an obtuse angle between the teeth portion and the core back portion in the contact portion in the open state and an acute angle in the closed state. It is desirable that the angle at the time of displacement from the state to the closed state is as small as possible. Therefore, in an open state, it is desirable that the teeth portion and the core back portion have an obtuse angle that is about 5 to 10 degrees larger than a right angle. By adopting such a configuration, it is possible to obtain a stator in which the coil can be easily wound and the strength of the thin connecting portion is small.

In Embodiments 1 to 5, the laminated structure is formed by laminating the divided core structure or the iron core structure obtained by connecting the divided core structures. However, a single-layer structure is used without taking a laminated structure. It may be configured. In the case of a single-layer structure, it is desirable to reduce the thickness of the thin-walled connecting portion as much as possible in consideration of the ease of rotation by reducing the stress when changing from the open state to the closed state.

In the first to fifth embodiments, the inner peripheral edge of the core back portion is a smooth surface without a step, but may have a step, and the outer edge of the inner peripheral edge of the core back portion of each divided iron core. The angle formed between the line connecting the portions and the teeth portion may be an obtuse angle in the open state and an acute angle in the closed state.

The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1a, 1b, 11a, 11b Thin connection part, 1s, 11s notch, 2a, 2b, 12a, 12b groove, 3a, 3b, 13a, 13b core back part, 3 _O core back part center line, 4a, 4b undercut parts, 5,15 teeth, 5 _O tooth centerline, 6 winding, 7a1 and 7a2 core back bobbin, 7b1 and 7b2 teeth bobbin, 10 stator, 10 _d split core, 10s segment core unit, 20 a rotor, 100 electric motor.

Claims

A plurality of split iron cores having a tooth portion around which a winding is wound and a core back portion that is connected to one end portion of the tooth portion via a thin connection portion and constitutes a magnetic path,
The teeth portion and the core back portion can contact each other with the thin connection portion disposed between the teeth portion and the core back portion as a fulcrum, and the teeth portion and the core back portion contact each other. Stator with an acute angle at the part.
2. The stator according to claim 1, wherein the divided iron core is configured by laminating a plurality of thin pieces each including the teeth portion, the core back portion, and the thin connection portion.
The thin-walled connecting portion can take an open state and a closed state,
In the open state, the opening angle at the contact portion between the teeth portion and the core back portion is an obtuse angle,
3. The fixing according to claim 1, wherein in the closed state, the teeth portion and the core back portion are in contact with each other, and an opening angle at the contact portion between the teeth portion and the core back portion is an acute angle. Child.
The stator according to any one of claims 1 to 3, wherein the thin-walled connecting portion is composed of a plurality of thin-walled portions provided apart from each other.
The stator according to any one of claims 1 to 4, wherein a plurality of the tooth portions are connected via the thin-walled connecting portion.
6. The fixing according to claim 2, wherein the teeth portion and the core back portion are respectively attached to each other and have a teeth bobbin and a core back bobbin that are in contact with each other in the closed state. Child.
The stator according to any one of claims 1 to 6,
An electric motor comprising: a rotor disposed in a region surrounded by the tooth portion.
A step of molding an iron core structure comprising: a tooth portion around which a winding is wound; and a core back portion that is connected to one end portion of the tooth portion via a thin-walled connecting portion and forms a magnetic path; ,
The step of winding the winding to the boundary between the teeth portion and the core back portion in an open state where the opening angle at the contact portion between the teeth portion and the core back portion is an obtuse angle;
A step of bringing the core back portion close and close to a position where the opening angle at the contact portion between the teeth portion around which the winding is wound and the core back portion forms an acute angle. Stator manufacturing method.
The method for manufacturing a stator according to claim 8, wherein the thin-walled connecting portion includes a plurality of thin-walled portions provided apart from each other.
The step of molding the iron core structure is a step of molding a structure in which two or more teeth portions are connected via the thin-walled connecting portion. Production method.
The step of molding the iron core structure includes
The method for manufacturing a stator according to any one of claims 8 to 10, including a step of molding an iron core structure in which an outer periphery of the core back portion is arranged on one straight line.
Prior to the step of winding the winding, attaching the teeth bobbin and the core back bobbin to the teeth portion and the core back portion, respectively.
After the step of winding the winding, the teeth portion around which the winding is wound and the core back portion are brought into contact with each other to form an acute angle so that the core back portion is brought close and closed, and the teeth bobbin The method for manufacturing a stator according to any one of claims 8 to 11, further comprising a step of bringing the core back bobbin and the core back bobbin into contact with each other.
Prior to the step of winding the winding,
The method for manufacturing a stator according to any one of claims 8 to 12, further comprising a step of stacking a plurality of layers of iron core structures.
A stator including a tooth portion around which a winding is wound and a core back portion that is connected to one end portion of the tooth portion via a thin connection portion and forms a magnetic path. The opening angle at the contact portion with the core back portion is an obtuse angle and an open state,
Winding the winding to the boundary between the teeth portion and the core back portion;
A step of bringing the core back portion close and close to a position where an opening angle at the contact portion between the teeth portion and the core back portion around which the winding is wound is an acute angle;
And a step of inserting a rotor into the stator obtained in the step of bringing into the closed state.