JP2007014088A - Stator for dynamo-electric machine, dynamo-electric machine, and method of manufacturing stator for dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator for a dynamo-electric machine, which is equipped with a high-density coil regardless of order of winding while securing easiness in formation of jumper wires and assembly. <P>SOLUTION: This method comprises a process of arranging a coil bobbin 10, where magnetic pole teeth 2a-2d are mounted and are coupled with one another by flexible insulating films 7a-7e, in such a state that it is warped reversely so as to direct the tips of the magnetic teeth parts 2a-2d outward, a process of winding a coil 4 on the coil bobbin 10 arranged in a reversely warped state, a process of arranging the coil bobbin 10 in annular arrangement so that each tip of the magnetic teeth 2a-2d may turn inside of the dynamo-electric machine, by curving the insulating films 7a-7e inward, and a process of arranging an outer core part 3 around the magnetic teeth parts 2a-2d. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stator for a rotating electrical machine, a rotating electrical machine, and a method for manufacturing the same, and more particularly to a structure and a method for manufacturing a stator used for a condenser induction motor for a ventilation fan.

  For example, in a rotating electric machine having a stator with a small number of slots (4 slots or 6 slots), since the arc length of the outer periphery of the slot is long, it is usually difficult to wind the coil at a high speed and high density in the inner space. It is. Therefore, in a conventional stator of a rotating electrical machine, the core of the stator core is divided so that it can be joined to a tooth portion and a yoke portion, a wire is wound around a coil bobbin made of an insulating material, and the tooth portion is fitted into the coil bobbin and the yoke is inserted. A method of increasing the density is conceived by joining the coil and connecting the coil and between the coil and the lead wire for insulation. (For example, see Patent Document 1)

  However, if the magnetic pole teeth of the split iron core are placed apart and wound, the assembly of the stator core and crossover processing becomes cumbersome, so the split iron core with the teeth and the yoke part held in an annular shape with regular dimensions in an annular shape. And the method of winding in order from the outer peripheral side is taken. Therefore, it is necessary to consider the coil shape so that the coil wound first is not affected by the winding work of the coil wound later. FIG. 10 is a cross-sectional view showing an example thereof. The stator core is divided into four magnetic pole teeth portions 102a, 102b, 102c, and 102d and an annular back yoke portion 103, and the magnetic pole teeth portions 102a, 102b, and 102c are divided. , 102d are provided with resin coil bobbins 106. The coils 104a and 104c wound in the first phase in the same phase continuously wind the magnet wire 101 around the coil bobbin 106 of the magnetic pole teeth portions 102a and 102c by the rotating fryer nozzle 105. Thereafter, coils 104b and 104d of substantially the same amount in different phases are wound around the coil bobbins 106 of the magnetic teeth portions 102b and 102d.

JP-A-5-191943 (paragraphs [0004], [0007], FIG. 3) JP 2004-147380 A (paragraphs [0014] and [0018], FIG. 7)

  The windings for the stator described above have the following problems. That is, in FIG. 10, when the coil is wound up to the outer peripheral corner space 107 in the winding of the first coil 104a, the winding of the subsequent coil 104b is changed to the winding of the coil 104a by the flyer nozzle 105. It cannot be performed with the same winding amount. Further, even if it is intended to wind up to the inner corner space 108 in the winding of the subsequent coil 104 b, the winding of the first coil 104 a is an obstacle for the passage space of the magnet wire 101 from the flyer nozzle 105. And cannot be wound. As a result, in the windings of the first coil 104a and the subsequent coil 104b, the winding amount is set in advance so that the winding does not reach the outer peripheral corner space 107 and the inner peripheral corner space 108 which are obstacles to each other. Need to be restricted. Thus, it has been difficult to obtain a high-performance rotating electrical machine (motor) that requires high-density coil winding in a limited size (motor size) of the rotating electrical machine. Although there is a former method that feeds the wire along a smooth mold even if there is an obstacle, the winding density and the winding method are different from the direct winding method in which the wire is wound directly on the coil bobbin by the flyer nozzle 105 as described above. Since there is a limit to the rotational speed and the degree of processing deterioration of the wire, it is not suitable for a small fan motor that winds a thin wire of 0.1 mm or less for thousands of turns.

  The present invention has been made to solve the above-described problems. A stator for a rotating electrical machine having a high-density coil regardless of the winding sequence while ensuring the ease of forming a crossover and assembling. The purpose is to obtain.

  A stator of a rotating electrical machine according to the present invention is formed by attaching a coil bobbin to a magnetic pole tooth of a stator core and winding a coil around the coil bobbin. A stator core that is divided into a tooth portion, a coil bobbin that is attached to each of the plurality of magnetic teeth portions, and in which a coil is wound, and an outer peripheral side of a coil bobbin that is adjacent in the circumferential direction of the rotating electrical machine are connected to each other. And a bendable insulating film.

  In the method of manufacturing a stator for a rotating electrical machine according to the present invention, a plurality of coil bobbins having a plurality of magnetic teeth portions attached and connected on an outer peripheral side by a bendable insulating film are provided. A step of arranging the coil bobbins in a reversely warped state, a step of winding a coil around the coil bobbins arranged in a reversely warped state, and bending an insulating film inward to form a plurality of coil bobbins. It comprises a step of arranging in an annular arrangement so that the tip of the magnetic teeth is directed to the inner peripheral side of the rotating electrical machine, and a step of disposing an outer core portion on the outer peripheral side of the magnetic pole teeth portion.

  According to the present invention, when winding the coil, the magnetic pole teeth portion of the stator core is divided from the outer core portion, and the insulating film for connecting the coil bobbins is set in a reverse warped state so that the tip of the magnetic pole teeth faces the outside. The surrounding area is completely open, enabling high-speed and high-density winding regardless of the winding sequence. In addition, continuous winding is facilitated by placing the crossover wire along the insulating film. Furthermore, when assembling the stator core, the connected coil bobbins are arranged in an annular shape while the insulating film is bent and curved toward the inner circumference side, so that the assembly can be done without the trouble of collecting individual cores and the leakage to the outer circumference side of the coil. The coil can be formed into an annular shape with good quality and quality.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

Embodiment 1 FIG.
1 is a cross-sectional view showing a stator winding method according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view showing a state of a coil formed into an annular shape after winding of the stator, and FIG. 3 is an outer core portion. FIG. 4 is a cross-sectional view showing the assembled state of the stator after press-fitting, FIG. 4 is an external view showing the original shape of the insulating film, and FIG. 5 is a perspective view showing the stator core and the insulating film.

  In the figure, the stator core is divided into magnetic tooth portions 2a, 2b, 2c, and 2d and an outer core portion 3 that is an annular yoke portion. A dividing surface 17 on which the core part 3 is mounted is formed. Coil bobbins 6 are mounted on the magnetic pole teeth 2a, 2b, 2c, and 2d, and coils 4a, 4b, 4c, and 4d are wound around the coil bobbins 6. Each coil bobbin 6 has an outer peripheral collar 16 and an inner peripheral collar 50, and the length of the outer peripheral collar 16 is such that the circumferential end of the outer peripheral collar 16 is located near the dividing surface 17 of the stator core. Is kept short. Instead, in order to ensure insulation between the coils 4 a, 4 b, 4 c, 4 d wound around the coil bobbin 6 and the outer core part 3, the outer core part 3 between the adjacent divided surfaces 17 is arranged. The insulating film is fixed, for example, by ultrasonic welding (melting a part of the resin of the coil bobbin) to the outer peripheral flange 16 so that the insulating films 7a to 7e occupy most of the region. As these insulating films 7a to 7e, PET films or the like that can maintain strength even when bent and curved are preferably used.

  As shown in FIG. 4 (a), the insulating films 7a, 7b, and 7c are provided with two sets of notches for winding a coil on the left and right, a total of four places, and are formed into a symmetrical shape at the bent central portion with a simple press. Punched out. As shown in FIG. 4B, the insulating films 7e and 7d are punched into a shape that is half the shape of the insulating films 7a, 7b, and 7c and that has a slightly extended center. The insulating film 7e is fixed to the outer peripheral side flange 16 of the coil bobbin 6 of the magnetic pole tooth portion 2b at one side of the notch. The insulating film 7a is fixed to the outer peripheral side flange 16 of the coil bobbin 6 of the magnetic pole teeth 2b and 2a at both sides of the notch. The insulating film 7b is fixed to the outer peripheral side flange 16 of the coil bobbin 6 of the magnetic pole tooth portions 2a, 2d at both sides of the notch. The insulating film 7c is fixed to the outer peripheral side flange 16 of the coil bobbin 6 of the magnetic pole tooth portions 2d and 2c at one side of both notches. The insulating film 7d is fixed to the outer peripheral side flange 16 of the coil bobbin 6 of the magnetic pole tooth portion 2c at one side of the notch. These insulating films 7a, 7b, 7c, 7d, and 7e connect the four coil bobbins 6, and on both sides of the magnetic pole teeth 2a, 2b, 2c, and 2d, on the outer peripheral side of the coil bobbin 6. It is arranged so as to include a U-shaped space via the flange 16, the side surface of the magnetic tooth portion, and the vicinity of the root of the inner peripheral flange 50.

  Next, a stator winding method according to the present embodiment will be described with reference to FIG. The four coil bobbins 6 connected by the insulating films 7a, 7b, and 7c are arranged in a state in which the magnetic teeth portions 2a, 2b, 2c, and 2d are reversely warped so that their tip portions face outward, The dividing surface 17 is fixed by the chuck 8. At this time, the end portions of the insulating films 7e and 7d are also fixed to the chuck 8 at the same time. In such a fixed state, the periphery of the coil bobbin 6 attached to the magnetic pole tooth portions 2a, 2b, 2c, and 2d becomes a complete open space without an obstacle. Therefore, the magnet wire 1 drawn out from the rotating flyer nozzle 5 is wound around a desired place around the magnetic pole teeth portion.

  For example, as shown in FIG. 1, the shape of the coil 4a wound around the magnetic pole tooth portion 2a is such that the magnet wire 1 is stacked substantially parallel to each other in a direction substantially perpendicular to the magnetic pole tooth portion 2a. Becomes a trapezoidal shape. When the chuck 8 is rotated with respect to the flyer nozzle 5 after the winding of the magnetic pole teeth portion 2a, the magnet wire 1 sequentially forms a crossover line along the insulating film 7b, the coil bobbin 6, and the insulating film 7c. It is used for winding to the in-phase magnetic pole tooth portion 2c. In this case, if the inner peripheral side of the insulating film is an extremely fine magnet wire, the coil shape can be held by the film alone, and if it is a slightly thicker magnet wire, a jig provided in a free state inside the flyer can be used. Retained. When the winding to the magnetic teeth portion 2c is completed, the winding to the magnetic teeth portion 2b in the same manner as the winding to the magnetic teeth portion of another phase is performed in the same manner, in order, the insulating film 7a, the coil bobbin 6, and the insulation. The connecting wire to the film 7b and the winding to the magnetic pole tooth portion 2d are continuously performed.

  Next, a coil forming method will be described with reference to FIG. The coils 4a, 4b, 4c, and 4d wound around the magnetic teeth 2a, 2b, 2c, and 2d are insulated with the tip of the magnetic teeth facing the outer periphery as shown by the dotted line in FIG. The films 7a, 7b, 7c, 7d, and 7e are connected. Then, after the fixing by the chuck 8 of FIG. 1 is removed, the four coil bobbins 6 connected to each other from the reverse warped state are bent while the insulating films 7a, 7b, 7c, 7d, and 7e are bent and bent to the inner peripheral side. The magnetic pole teeth are arranged in an annular arrangement so that the tips of the magnetic teeth face the inner peripheral side. Subsequently, the coils 4a, 4b, 4c and 4d are moved and pressed toward the center by the forming jig 9 arranged on the outer peripheral side thereof. As a result, the coils 4a, 4b, 4c, and 4d are configured so that adjacent coils occupy the slots while being in contact with each other, and are formed from a trapezoidal shape to a sector shape that is the final shape. Finally, the end portions of the insulating films 7e and 7d are folded and fixed with a tape or the like to obtain a stator assembly 24 composed of an annular coil and magnetic pole teeth.

  Next, a method for assembling the stator will be described with reference to FIG. In the annular assembly 24, the split surfaces 17 of the magnetic pole tooth portions 2a, 2b, 2c, and 2d arranged on the outer peripheral side are press-fitted and fitted into the outer core portion 3 so as to be integrated with the outer core portion 3. The stator 25 is formed. A rotating electric machine is completed by disposing a rotor (not shown) on the inner peripheral side of the stator 25.

  As described above, according to the present embodiment, an open space is formed around the magnetic teeth portion, so that high-speed and high-density winding can be performed regardless of the winding order of the slots. By forming it in an annular shape, it can be formed into a coil arranged in a full slot. At this time, since the coil bobbin 6 is connected via the insulating films 7a, 7b, and 7c, the connecting wire of the coil is formed without being cut and easily wound continuously. Further, since the insulating film is formed while protecting the coil, the insulating property can be easily secured. In particular, a thin wire coil having a wire diameter of around 0.1 requires a small force and can be easily formed into a desired coil shape. That is, it is possible to obtain a high-performance rotating electric machine (motor) having a high-density coil while satisfying productivity and quality.

  Also, the inner peripheral side of the coil bobbin is provided with an inner peripheral side collar, and the insulating film extends in the circumferential direction of the rotating electrical machine from the vicinity of the base of the inner peripheral side collar. It is possible to easily secure a space for bending in advance, and higher-density winding / molding is possible.

Furthermore, the insulating film that connects the outer peripheral sides of the coil bobbins is integrated with the insulating film that extends to the inner peripheral side of the slots between the coil bobbins, and is composed of one continuous sheet that covers the slots. A function of connecting, a function of easily securing a space for the coil to bend inside the slot after molding, and a function of ensuring insulation from the outside of the coil in the slot can be provided.

Embodiment 2. FIG.
6 is a perspective view showing a state where an insulating film is attached to a coil bobbin according to Embodiment 2 of the present invention, and FIG. 7 is a cross-sectional view showing a state of a coil formed in an annular shape after winding of the stator in this embodiment. FIG. Other configurations not shown are the same as those in the first embodiment.

  In the present embodiment, the coil bobbin 10 includes an outer peripheral side collar 18 and an inner peripheral side collar 19, and magnetic pole teeth 2 a, 2 b, 2 c, 2 d are mounted in advance. And the insulating film 11 which consists of one continuous sheet | seat with respect to the said coil bobbin 10 is inserted from one direction. Four cutouts are provided at one end of the insulating film 11, and a peripheral portion of the cutout is welded and fixed to the outer peripheral side flange 18 of each coil bobbin 10 to connect the coil bobbins 10.

  When the fixing of the coil bobbin 10 and the insulating film 11 is completed, the four coil bobbins 10 connected by the insulating film 11 are connected to the tips of the magnetic pole teeth 2a, 2b, 2c and 2d in the same manner as in the first embodiment. It arrange | positions so that it may be in the state of reverse warping so that a part may face outside, and it fixes with a chuck | zipper. Then, the coils 4a, 4b, 4c, and 4d are wound around the magnetic pole teeth 2a, 2b, 2c, and 2d. Thereafter, after fixing with the chuck, as shown in FIG. 7, while bending and bending the insulating film 11 to the inner peripheral side, the four coil bobbins 10 connected to each other are inserted into the opposite ends of the magnetic pole teeth from the reverse warped state. Arrange them in an annular arrangement so that they face the circumference. Subsequently, the coils 4a, 4b, 4c, and 4d are moved and pressed toward the center by the forming jig 9 arranged on the outer peripheral side thereof. As a result, the coils 4a, 4b, 4c, and 4d are configured so that adjacent coils occupy the slots while being in contact with each other, and are formed from a trapezoidal shape to a sector shape that is the final shape. In this way, an assembly 24 composed of an annular coil and magnetic pole teeth is obtained.

  As described above, according to the present embodiment, in addition to the effects described in the first embodiment, since the insulating film is composed of one sheet, it can be easily fixed to the coil bobbin, and can be more productive. A high-performance rotating electric machine (motor) can be obtained.

  Further, in this embodiment, since the insulating film does not have a portion surrounding the slot inner peripheral side, the coil holding function is not as high as that in the first embodiment, but the coil forming effect is achieved by the inner peripheral side collar 19 of the coil bobbin 10. The coil can be held to such an extent that

Embodiment 3 FIG.
FIG. 8 is a perspective view showing a state where an insulating film is attached to a coil bobbin according to Embodiment 3 of the present invention. Other configurations not shown are the same as those in the first embodiment.

  In the present embodiment, the coil bobbin 12 includes an outer peripheral collar 28 and an inner peripheral collar 29. Then, an insulating film 13 made of one continuous sheet is inserted into the coil bobbin 12. The insulating film 13 is provided with a hole through which the magnetic teeth 2a, 2b, 2c and 2d can penetrate from one direction. In this case, the four coil bobbins 12 are welded and fixed on the inner peripheral side of the outer peripheral side collar 28 so that the insulating film 13 is aligned in advance.

  And after inserting magnetic pole tooth part 2a, 2b, 2c, 2d with respect to the coil bobbin 12 connected with the insulating film 13 by radial direction, it connects with the insulating film 13 similarly to Embodiment 1. FIG. The four coil bobbins 12 are arranged so as to be reversely warped so that the tip ends of the magnetic pole tooth portions 2a, 2b, 2c, and 2d face outward, and are fixed by a chuck. Then, the coils 4a, 4b, 4c, and 4d are wound around the magnetic pole teeth 2a, 2b, 2c, and 2d. Thereafter, after fixing by the chuck, the insulating film 13 is bent and bent toward the inner peripheral side, and the four coil bobbins 13 connected to each other so that the tips of the magnetic pole teeth portions face the inner peripheral side from the reversely warped state. Line up in a circular arrangement. Subsequently, the coils are moved and pressed toward the center by a forming jig arranged on the outer peripheral side of the coils. As a result, the shape of each coil comes to occupy the inside of the slot while adjacent coils are in contact with each other, and is formed from a trapezoidal shape to a sector shape which is the final shape. In this way, an assembly composed of an annular coil and a magnetic teeth portion is obtained.

  According to the present embodiment, since the insulating film is made of one sheet, it is easy to fix to the coil bobbin 10 and a plurality of coil bobbins can be connected in an annular shape without assembling the magnetic pole teeth part. The internal winding process can be simply configured, and a high-performance rotating electrical machine (motor) with higher productivity can be obtained.

Embodiment 4 FIG.
FIG. 9 shows a stator according to Embodiment 4 of the present invention, and is a cross-sectional view showing a state of a coil formed into an annular shape after being wound around a coil bobbin.

  In the present embodiment, the stator core includes the magnetic teeth portions 14a, 14b, 14c, and 14d, and the outer core portions 15a, 15b, 15c, and 15d so that their dividing surfaces 20 are positioned in the vicinity of the extension lines of the magnetic teeth. It is divided into

  Insulating film 7a, so that coil bobbin 6 assembled to magnetic teeth portions 14a, 14b, 14c, 14d and configured so that the circumferential end of outer peripheral side collar 16 is in the vicinity of dividing surface 20 is in a reversely warped state. After 7b, 7c, 7d and 7e are fixed, the coils 4a, 4b, 4c and 4d are wound around the magnetic pole teeth 2a, 2b, 2c and 2d by the flyer nozzle 5. Then, while bending and bending the insulating films 7a, 7b, 7c, 7d, and 7e to the inner peripheral side, the four coil bobbins 6 connected are annular so that the tips of the magnetic pole teeth face the inner peripheral side from the reversely warped state. Line up to the arrangement. Next, the outer cores 15a, 15b, 15c, and 15d, which are part of the stator core, are fixed to the wound coils by pressing from the outer peripheral side toward the center. As a result, the shape of each coil occupies the inside of the slot while adjacent coils are in contact with each other, and is formed from a trapezoidal shape to a sector shape which is the final shape. In this way, an assembly composed of an annular coil and a magnetic teeth portion is obtained.

  According to the present embodiment, the outer core portion that is a part of the stator core can take on the pressing function of the forming jig, and a high-performance rotating electrical machine (motor) can be obtained with high productivity.

  In the above embodiment, the example in which the insulating film is welded and fixed to the coil bobbin has been shown. However, the same is true for adhesive fixing, double-sided tape fixing, fixing by an integral resin mold, and fixing by inserting the coil bobbin and the core into the gap. effective.

  Moreover, in Embodiment 1 described above, the insulating film to be the annular terminal portion showed two pieces that were divided in advance, but like the remaining three places, a connected one piece forms a reverse warp state, After winding, when the coil is formed, the portion of the insulating film may be divided.

  Moreover, although the example which welds and fixes the insulating film which consists of one sheet | seat to the coil bobbin was shown in the said embodiment, you may take the method of integrally forming with the resin material of a coil bobbin within a shaping die.

  In the above embodiment, the method for assembling the coil bobbin has not been shown in detail. However, if the insulation distance can be secured, the same effect as described above can be obtained even if it is divided in the stacking direction or radial direction in order to improve the assembling property. can get.

It is sectional drawing which shows the winding method of the stator by Embodiment 1 of this invention. It is sectional drawing which shows the state of the coil shape | molded by the annular | circular shape after the winding of the stator in Embodiment 1 of this invention. It is sectional drawing which shows the assembly state of a stator after outer core part press-fit in Embodiment 1 of this invention. It is an external view which shows the original shape of the insulating film by Embodiment 1 of this invention. It is a perspective view which shows the stator core and insulating film by Embodiment 1 of this invention. These are perspective views which show a mode that an insulating film is mounted | worn with the coil bobbin by Embodiment 2 of this invention. It is sectional drawing which shows the state of the coil shape | molded by the annular | circular shape after the winding of the stator in Embodiment 2 of this invention. It is a perspective view which shows a mode that an insulating film is mounted | worn with the coil bobbin by Embodiment 3 of this invention. It is sectional drawing which shows the stator by Embodiment 4 of this invention, and shows the state of the coil shape | molded by the annular | circular shape after winding to a coil bobbin. It is sectional drawing for demonstrating the winding method of the conventional stator.

Explanation of symbols

2a, 2b, 2c, 2d magnetic pole teeth, 4a, 4b, 4c, 4d coils,
6 Coil bobbin, 7a, 7b, 7c, 7d, 7e Insulating film,
10 coil bobbin, 11 insulating film, 12 coil bobbin, 13 insulating film, 14a, 14b, 14c, 14d magnetic pole teeth,
15a, 15b, 15c, 15d Outer core part, 16 outer peripheral side collar, 17 split surface, 18 outer peripheral side collar, 19 inner peripheral side collar, 20 split surface, 50 inner peripheral side collar.

Claims (8)

A stator core configured to be divided into an outer core portion and a plurality of the magnetic teeth portions disposed on the inner peripheral side from the outer core portion;
A coil bobbin mounted on each of the plurality of magnetic pole teeth and wound with a coil;
A stator for a rotating electrical machine comprising a bendable insulating film that connects the outer peripheral sides of the coil bobbins adjacent in the circumferential direction of the rotating electrical machine. The outer peripheral side of the coil bobbin is provided with an outer peripheral side collar having at least a peripheral length for fixing the insulating film, and the outer peripheral side collars of the coil bobbin adjacent to each other in the circumferential direction of the rotating electrical machine are connected by the insulating film. The stator for a rotating electrical machine according to claim 1, wherein the stator is a rotating electrical machine. 2. The rotating electrical machine according to claim 1, wherein an inner peripheral side collar is provided on an inner peripheral side of the coil bobbin, and an insulating film extending in a circumferential direction of the rotating electrical machine from a vicinity of a base of the inner peripheral side collar is provided. Stator. The insulating film that connects the outer peripheral sides of the coil bobbins is formed of a single continuous sheet that is integrated with an insulating film that extends to the inner peripheral side of the slots between the coil bobbins and covers the slots. The stator of the rotary electric machine according to claim 1. 2. The stator of a rotating electrical machine according to claim 1, wherein the insulating film that connects the outer peripheral sides of the coil bobbins is composed of one continuous sheet in the circumferential direction of the rotating electrical machine. 2. The stator of a rotary electric motor according to claim 1, wherein a split surface between the magnetic pole tooth portion and the outer core portion is provided in an outer core portion in the vicinity of a ridge line of the magnetic pole tooth extending outward in the radial direction. A rotating electrical machine comprising a rotor on an inner peripheral side of a stator of the rotating electrical machine according to any one of claims 1 to 6. A step of arranging a plurality of coil bobbins mounted with a plurality of magnetic teeth portions and connected on the outer peripheral side thereof by a bendable insulating film in a state in which the magnetic teeth portions are reversely warped so that their tip portions are directed outward. When,
Winding a coil around the coil bobbin arranged in the reverse warped state;
Arranging the plurality of coil bobbins in an annular arrangement such that the tip ends of the magnetic pole teeth face the inner peripheral side of the rotating electrical machine, and the insulating film is curved inward;
A method of manufacturing a stator of a rotating electrical machine comprising a step of disposing an outer core portion on an outer peripheral side of the magnetic pole tooth portion.

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