JP2011151933A - Method for manufacturing stator of rotating electric machine, and stator of rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator of a rotating electric machine which facilitates coil winding and does not interfere with a frame or the like even if a protrusion is formed due to an effect that a core is brought into a reversely warped state. <P>SOLUTION: The stator includes a bendable thin-walled part 4 which connects external peripheral ends of back yokes of adjacent magnetic pole pieces and a notch 41 which has a recess 42 formed at the external peripheral side of the thin-walled part 4 and chamfered parts 43 which are arranged at both edges of the recess 42 and have inclinations symmetric to a bend line of the thin-walled part 4. Teeth wound around the coil are reversely warped and arranged in a direction apart from the adjacent teeth, and each of the teeth reversely warped and arranged is wound with the coil. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a stator of a rotating electric machine and a structure of the stator of the rotating electric machine.

  In the conventional stator, the core 30 has a chain portion 31 formed in a substantially arc shape in a direction in which the pole portions 32 are separated from each other in the released state, and the pole portion 32 protrudes in the radially outward direction of the arc formed by the chain portion 31. ing. In this state, the bobbin is attached to the outer periphery of the pole portion 32, and the coil 14 is wound by a winding machine (not shown) from the radially outer direction of the arc formed by the chain portion 31, and then the core is disposed so that the pole portion 32 faces the radially inner direction. 30 is rounded into an annular shape (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 08-149771 (paragraph number [0020], FIG. 4 etc.)

In the conventional stator of a rotating electric machine, the chain portion is formed in a substantially arc shape in the direction in which the pole portions are separated from each other. However, since the interval between the pole portions is not sufficient, there is a problem that when the coil is wound, the flyer that turns the pole portion interferes with the adjacent pole portion and the flyer. In order to reliably wind the coil, for example, a winding guide jig for guiding the coil to the pole portion is used, and it is necessary to wind the coil by sliding the coil on this. Such a winding method makes it difficult to arrange the coil at an arbitrary position as compared with the case of winding directly on the pole portion with a flyer, and high-density coil winding is difficult.
Further, in order to directly wind a coil with a flyer without using a winding guide jig, a state in which the flyer is further warped in a direction further away so as not to interfere with an adjacent pole portion (hereinafter referred to as a reverse warp state). ) To change the core shape. However, when the core is warped, the connecting portion may be plastically deformed to produce a protrusion, and if the core is rolled into an annular shape after winding the coil, the protrusion protrudes from the outer periphery of the core and cannot be press-fitted into the frame. Occurs.
The present invention has been made in order to solve the above-described problems, and facilitates winding of a coil, and a rotating electric machine that does not interfere with a frame or the like even if a protrusion is generated by setting a core in a reverse warped state. The purpose is to manufacture a stator.

  A method of manufacturing a stator for a rotating electrical machine according to the present invention includes a plurality of magnetic pole pieces each having a back yoke portion extending in the circumferential direction and a tooth portion protruding from the back yoke portion, and adjacent magnetic pole pieces arranged Bendable thin-walled portions that connect the outer end portions of the back yoke portions, and a recess provided on the outer peripheral side of the thin-walled portion and a symmetrical inclination with respect to the bending line of the thin-walled portion provided at both edge portions of the recessed portion. And a notch portion having a chamfered portion, and a manufacturing method of a stator of a rotating electrical machine formed by bending a thin portion and arranging magnetic pole pieces in an annular shape by bending the thin portion. And a reverse warping step in which a tooth portion wound around the coil is reversely warped in a direction away from the adjacent tooth portion, and a coil winding step in which the coil is wound around the reversely warped tooth portion. , After winding the coil It includes an annular arrangement step of arranging annularly, and a step of fitted into the frame and the pole piece tubular annularly disposed pole piece bent.

  Further, the stator of the rotating electrical machine according to the present invention includes a plurality of magnetic pole pieces each having a back yoke portion extending in the circumferential direction and a tooth portion protruding from the back yoke portion, and each magnetic pole piece arranged adjacently. A bendable thin-walled portion that connects the end portions on the outer peripheral side of the back yoke portion, a recess provided on the outer peripheral side of the thin-walled portion, and a symmetric inclination with respect to the bending line of the thin-walled portion provided on both edge portions of the recess A cylindrical frame in which a unit core having a notch portion having a chamfered portion, a coil wound around a tooth portion, and a plurality of magnetic pole pieces arranged in an annular shape by bending a thin portion is inserted. And.

According to the method of manufacturing a stator for a rotating electrical machine of the present invention, the thin portion is bent toward the outer peripheral side, and the teeth portion around which the coil is wound is reversely warped in the direction away from the adjacent teeth portion, and then the coil is wound. Since it rotates, the coil winding operation becomes easy.
In addition, even if the thin wall portion is plastically deformed during reverse warping and a protrusion is generated in the thin wall portion, the protrusion is housed in the notch portion of the thin wall portion. It does not protrude to the outer peripheral side, can prevent interference between the protrusion and the frame, and can easily manufacture the stator.
Moreover, since the notch has a chamfered portion, it is possible to prevent the two edge portions of the notch from interfering with each other during reverse warping. At the same time, it is possible to reduce the cross-sectional area of the notch portion required to accommodate the protrusion generated by the reverse warp, and it is possible to manufacture a stator that suppresses the reduction of the magnetic path area due to the notch portion.

Further, according to the stator of the rotating electric machine of the present invention, since the notch portion is provided on the outer peripheral side of the thin portion, the thin portion is plastically deformed and protrudes to the outer peripheral side of the thin portion when the coil is wound. Even if this occurs, the protrusion can be accommodated in the notch, and interference between the protrusion and the frame can be prevented.
Moreover, since the notch has a chamfered portion, it is possible to prevent the two edge portions of the notch from interfering with each other during reverse warping. At the same time, it is possible to reduce the cross-sectional area of the notch portion required to accommodate the protrusion caused by the reverse warp.

It is a perspective view which shows the structure of the unit core in Embodiment 1 of this invention. It is an enlarged plan view which shows the structure of the unit core in Embodiment 1 of this invention. It is a top view which shows the state which mounted | wore the insulator in the unit core in Embodiment 1 of this invention. It is a top view which shows the stator of the rotary electric machine in Embodiment 1 of this invention. It is explanatory drawing for demonstrating the manufacturing method of the stator in Embodiment 1 of this invention. It is explanatory drawing for demonstrating the manufacturing method of the stator in Embodiment 1 of this invention. It is explanatory drawing for demonstrating the manufacturing method of the stator in Embodiment 1 of this invention. It is explanatory drawing for demonstrating the manufacturing method of the stator in Embodiment 1 of this invention. It is explanatory drawing for demonstrating the reverse curvature angle in the manufacturing method of the stator in Embodiment 1 of this invention. FIG. 10 is a partially enlarged view of FIG. 9. It is explanatory drawing for demonstrating the effect by the shape of the notch part of the stator in Embodiment 1 of this invention. It is a top view which shows the structure of the unit core in Embodiment 2 of this invention. It is a top view which shows the structure of the stator of the rotary electric machine in Embodiment 2 of this invention. It is explanatory drawing for demonstrating the coil winding method of the stator in Embodiment 2 of this invention.

Embodiment 1 FIG.
1 is a perspective view showing a unit core constituting a stator of a rotating electric machine according to Embodiment 1 of the present invention, FIG. 2 is an enlarged plan view showing a portion A of FIG. 1, and FIG. 3 is an insulator attached to the unit core. FIG. 4 is a plan view showing a stator formed by arranging unit cores in an annular shape.
As shown in FIG. 1, a unit core 2 constituting the stator 1 (see FIG. 4) is a laminated unit core 2 formed by stacking a plurality of magnetic plate materials such as electromagnetic steel plates. A magnetic pole piece 3 and a bendable thin portion 4 for connecting the magnetic pole pieces 3 are provided. The lamination between the magnetic plate members of the unit core 2 is fixed, for example, by caulking or welding. In the first embodiment, the number of the magnetic pole pieces 3 constituting the unit core 2 is three. However, any number of the magnetic pole pieces 3 constituting the stator 1 may be connected. It is good also as a structure.
The pole piece 3 has a back yoke portion 31 extending in the circumferential direction and a teeth portion 32 protruding in the center direction from the center portion of the back yoke portion 31.
The thin-walled portion 4 connects the end portions on the outer peripheral side of the back yoke portion 31 of the pole pieces 3 arranged adjacent to each other.

  As shown in FIG. 2, a cutout portion 41 is formed on the outer peripheral side of the thin portion 4. The notch 41 has a two-stage configuration of a recess 42 having a substantially V-shape when viewed from the axial direction and a chamfer 43 formed on both edge portions of the recess 42. The chamfered portion 43 has an inclined surface that is symmetric with respect to the bending line B of the thin-walled portion 4, and the substantially V-shaped shape of the notch portion 41 is a shape that is symmetric with respect to the bending line B. The bending line B of the thin portion 4 is a line where the thin portion 4 is bent, and is a center line in the circumferential direction of the thin portion 4. The angle formed by the chamfered portion 43 and the bending line B is α (hereinafter, referred to as a chamfer angle α), and a reverse warp angle β described later is determined in relation to the chamfer angle α.

  As shown in FIG. 3, a pair of insulators 5 are arranged on both end surfaces in the axial direction of each magnetic pole piece 3 constituting the unit core 2 so as to cover the back yoke portion 31 and the tooth portion 32 of the magnetic pole piece 3. . The insulator 5 is, for example, a resin molded product, and the magnetic pole piece 3 and the coil 6 are electrically insulated by winding the coil 6 (see FIG. 4) around the tooth portion 32 via the insulator 5.

Next, the structure of the stator 1 formed by arranging the unit core 2 in an annular shape will be described with reference to FIG.
The stator 1 is a stator 1 applied to an inner rotor type motor, and is composed of twelve magnetic pole pieces 3. Since the unit core 2 of the first embodiment is configured by connecting the three magnetic pole pieces 3, the four unit cores 2 are used to configure the stator 1.
In the state where the coil 6 is wound around the tooth portion 32 of each magnetic pole piece 3 of the unit core 2, the thin portion 4 of the unit core 2 is bent toward the inner peripheral side, and twelve magnetic poles including four unit cores 2. The piece 3 is arranged in an annular shape. A cylindrical frame 7 is disposed on the outer peripheral side of the annular pole piece 3. As a material of the frame 7, for example, a ferromagnetic material such as iron is preferably used.

Next, an example of a method for manufacturing the stator 1 according to the first embodiment will be described with reference to FIGS.
First, the insulator 5 is attached to the unit core 2 (see FIG. 3).

  Next, the process proceeds to the reverse warping process. As shown in FIG. 5, the thin portion 4 of the unit core 2 is bent to the outer peripheral side, and the teeth of the magnetic pole piece 3 </ b> B that is disposed adjacent to the teeth portion 32 </ b> A of the magnetic pole piece 3 </ b> A that first winds the coil 6. Arranged backwardly in a direction away from the portion 32B. Further, in the first embodiment, the thin portion 4 between the magnetic pole piece 3B and the adjacent magnetic pole piece 3C is also bent to the outer peripheral side, and the magnetic pole pieces 3B and 3C are also arranged in a reverse warp. Then, the unit core 2 in the reverse warped state is fixed by the core holding jig 8.

  Next, it progresses to a coil winding process. The flyer 9 that performs the winding operation of the coil 6 is disposed at a position facing the teeth portion 32 </ b> A around which the coil 6 is wound. The flyer 9 turns around the turning center axis 91 in the direction of arrow A in FIG. 5 or in the opposite direction, and the tip end portion 92 of the flyer 9 rotates around the teeth portion 32A. The coil 6 drawn out from a bobbin (not shown) is drawn out from the tip end portion 92 via the inside of the flyer 9. And the coil 6 is wound by 32 A of teeth parts, when the front-end | tip part 92 of the flyer 9 rotates the circumference | surroundings of 32 A of teeth parts. Further, the flyer 9 moves in the axial direction (the direction of arrow B in FIG. 5). As the flyer 9 turns in the direction of arrow A and moves in the direction of arrow B, the coil 6 can be wound in an aligned manner from the root portion of the tooth portion 32A to the tip portion and from the tip portion to the root portion. FIG. 6 shows a state after the end of 6 turns of the coil on the tooth portion 32A.

  Next, the coil 6 is wound around the tooth portion 32B of the magnetic pole piece 3B. As shown in FIG. 7, the core holding jig 8 is rotated about the central axis 81 by an angle β in the direction of the arrow C, and the teeth portion 32 </ b> B and the flyer 9 are arranged to face each other. The angle β will be described later. Then, the flyer 9 is operated in the same procedure as when the coil 6 is wound around the tooth portion 32A, and the coil 6 is wound around the tooth portion 32B. Similarly, the coil 6 is wound around the tooth portion 32C of the magnetic pole piece 3C.

  Next, it progresses to an annular arrangement process. After winding the coil 6 around all the magnetic pole pieces 3 of the unit core 2, the thin portions 4 of the unit core 2 are bent toward the inner peripheral side, and the magnetic pole pieces 3 are annular so that the teeth portion 32 faces the center. To place. As shown in FIG. 8, in the first embodiment, four unit cores 2 having the same shape are annularly arranged to form a stator 1. The end surfaces 21 of the adjacent unit cores 2 are joined together by welding or the like, for example. The end surface 21 of the unit core is an end surface on the opposite side to the thin portions 4 of the back yoke portions 31A and 31C of the magnetic pole pieces 3A and 3C disposed at both ends of the unit core 2.

  Then, after performing the necessary electrical connection work, the annularly arranged unit core 2 is fitted and inserted into the cylindrical frame 7 by press fitting or the like to form the stator 1 (see FIG. 4).

Here, an angle β between the adjacent tooth portions 32 in the reverse warping step (hereinafter referred to as a reverse warp angle β) will be described.
FIG. 9 is a diagram for explaining the reverse warp angle β, and is a plan view showing a state in which the unit core 2 is arranged in a reverse warp. FIG. 10 is an enlarged view of a portion Z in FIG. The reverse warp angle β will be described by taking as an example a case where the magnetic pole piece 3 around which the coil 6 is wound is the magnetic pole piece 3B disposed in the center of the unit core 2.
As shown in the figure, the reverse warp angle β is an angle formed by the center line in the circumferential direction of the tooth portion 32B and the center line in the circumferential direction of the adjacent tooth portions 32A and 32C. The reverse warp angle β is set so that the following relationship is established with the chamfer angle α described above.
β ≦ 2 × α (Formula 1)
If the reverse warp angle β and the chamfering angle α are set so as to have the relationship as shown in Equation 1, when the magnetic pole piece 3 is reversely warped at the reverse warp angle β, the chamfered portion 43 having the chamfering angle α is used as the notch 41. There is no interference between both edge portions (see FIG. 10).

In addition, as shown in FIG. 10, the bent portion of the thin portion 4 may have a protrusion 44 due to plastic deformation due to reverse warping. However, since the protrusion 44 is generated in the recess 42 formed in the notch 41 of the thin portion 4, the generated protrusion 44 is not formed in the notch 41 even if the magnetic pole pieces 3 are annularly arranged by the annular arrangement process. The projection 44 does not protrude outside the outer peripheral surface of the back yoke portion 31. Accordingly, the protrusion 44 can be prevented from interfering with the frame 7 disposed on the outer peripheral side of the annularly disposed magnetic pole piece 3, and the work of inserting the annularly disposed magnetic pole piece 3 into the frame 7 is easy. Can be done.
As described above, the coil 6 is easily wound around the tooth portion 32 by arranging the warp in the reverse direction, the interference between both edges of the notch portion 41 due to the reverse warp, and the protrusion 44 caused by the reverse warp. Thus, the stator 1 that can prevent the frame 7 from interfering can be obtained.

In the first embodiment, the tooth portions 32A and 32C of the magnetic pole pieces 3A and 3C arranged adjacent to the magnetic pole piece 3B are the boundary lines between the tooth portion 32B and the back yoke portion 31B of the magnetic pole piece 3B. Backward warping is performed up to a position on the outer side (back yoke portion 31B side) from the tooth extension line 33.
For this reason, the distance between the teeth 32A and 32C adjacent to the teeth 32B around which the coil 6 is wound can be increased, and the flyer 9 does not interfere with the adjacent teeth 32A and 32C. Therefore, the coil 6 can be directly wound around the tooth portion 32B by the flyer 9, and the coil 6 can be wound more easily and at a high density.

Next, the effect by the shape of the notch part 41 of this Embodiment 1 is demonstrated using FIG. FIG. 11 is an enlarged view showing the shape of the cutout portion 41 of the first embodiment, and also shows a cutout portion 141 (dotted line in the drawing) as a comparative example for explaining the effect.
As described above, the cutout portion 41 of the first embodiment has a two-stage configuration of the substantially V-shaped recess 42 and the chamfered portion 43 formed at both edge portions thereof. On the other hand, the cutout portion 141 of the comparative example is not a two-stage configuration but a substantially rectangular cutout portion 141.

As shown in FIGS. 9 and 10, the notch portion 41 of the first embodiment reversely warps adjacent teeth portions 32 </ b> A and 32 </ b> C to a position of a reverse warp angle β that is outside the teeth extension line 33 of the teeth portion 32 </ b> B. Even if it does, both edge parts will not interfere by the chamfering part 43 of the chamfering angle (alpha) satisfy | filling the relationship of said (Formula 1).
And even if it is the substantially rectangular notch part 141 like a comparative example, the width | variety of the circumferential direction of the notch part 141 becomes the same width as the circumferential width of the notch part 41 of this Embodiment 1. FIG. If it is set to, even if it reversely warps to the position of the reverse warp angle β as shown in FIG. However, since the notch area of the notch part 141 of the comparative example is larger than the notch area of the first embodiment, the magnetic path area is reduced.
In other words, the cutout portion 41 of the first embodiment is provided with the chamfered portion 43, thereby preventing interference between both edge portions of the cutout portion 41 and ensuring a large magnetic path area. In addition, an increase in magnetic resistance due to a decrease in the magnetic path area can be prevented.
Further, in the cutout portion 41 of the first embodiment, a substantially V-shaped concave portion 42 is provided so that a cutout depth necessary for storing the projection 44 is ensured, and a substantially V-shape is provided. Since the notch area can be minimized, a larger magnetic path area is secured.

As described above, in the stator 1 according to the first embodiment, the thin portion 4 is bent toward the outer peripheral side, and the teeth portion 32 around which the coil 6 is wound is reversely warped in the direction away from the adjacent teeth portion 32. Since the coil 6 is wound later, the winding work of the coil 6 becomes easy.
Further, if the adjacent teeth portions 32 are arranged so as to be outside the teeth extension line 33 of the teeth portion 32 around which the coil 6 is wound by reverse warping, the coil 6 can be wound more easily, and the flyer 9, the coil 6 can be wound directly around the tooth portion 32, so that the high-density coil 6 can be wound.

  Further, even if the thin portion 4 is plastically deformed during the reverse warp and the projection 44 is generated, the projection 44 is accommodated in the notch portion 41 provided on the outer peripheral side of the thin portion 4, so that the unit core 2 is attached after 6 turns of the coil. When annularly arranged, the protrusion 44 does not protrude outward from the outer peripheral surface of the back yoke portion 31. Accordingly, interference between the projection 44 and the frame 7 can be prevented, and the press-fitting work into the frame 7 can be easily performed.

Further, since the chamfered portions 43 are formed at both edge portions of the notch portion 41, it is possible to prevent the both end portions on the outer peripheral side of the notch portion 41 from interfering with each other during reverse warping. Along with this, the notch area of the notch 41 necessary for accommodating the protrusion 44 caused by the reverse warp can be reduced, and the stator 1 in which the reduction of the magnetic path area by the notch 41 is suppressed is obtained. Can do.
Furthermore, by providing the substantially V-shaped recess 42 in the notch 41, the notch area can be further reduced, and a stator in which the reduction of the magnetic path area is further suppressed can be obtained.
If the material of the frame 7 is a ferromagnetic material such as iron, the frame 7 can be used as a magnetic path, and the reduction in efficiency due to the decrease in the magnetic path area caused by the notch 41 can be further suppressed. it can.

Embodiment 2. FIG.
The second embodiment is different from the first embodiment in the shape of the end face of the unit core. Moreover, the winding method of a coil differs. In addition, about the part similar to the said Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

First, the shape of the end surface of the unit core 202 according to the second embodiment will be described.
FIG. 12 is a plan view showing the configuration of the unit core 202 of the second embodiment, and FIG. 13 is a plan view showing the configuration of the stator 201 of the second embodiment.
As shown in FIG. 12, a convex portion 22 protruding in the circumferential direction is formed on the end surface of the back yoke portion 31A of the magnetic pole piece 3A that forms one end surface 221A of the unit core 202. Further, a concave portion 23 having a shape that fits the convex portion 22 is formed on the end surface of the back yoke portion 31C of the magnetic pole piece 3C that forms the other end surface 221B of the unit core 202.
Then, four unit cores 202 having such a shape are used, and as shown in FIG. 13, the concave portion 23 of the other end surface 221B of the unit core 202 adjacent to the convex portion 22 of the one end surface 221A of the unit core 202 is formed. Place it in a ring while fitting.
Such a configuration facilitates positioning between the unit cores 202 and eliminates the need for joining by welding or the like, thereby reducing welding costs.

Next, the winding method of the coil 6 of this Embodiment 2 is demonstrated with reference to FIG.
As shown in the figure, in the second embodiment, two unit cores 202 arranged in a reverse warpage are arranged in parallel and fixed, and the coil 6 is wound around the two unit cores 202 simultaneously by two flyers 9. .
In the second embodiment, a gear 10A is fixed to the turning center shaft 91A of the first flyer 9A, a gear 10B is fixed to the turning center shaft 91B of the second flyer 9B, and a belt is provided between the gears 10A and 10B. 11 are connected. A motor (not shown) is connected to the turning center shaft 91A of the first flyer 9A. When the turning center shaft 91A is turned by the motor, the turning center shaft 91B of the second flyer 9B is turned in conjunction with this. It has become.
Two unit cores 202A and 202B in a reverse warped state are arranged so as to face each flyer 9A and 9B, and the winding process is performed in the same manner as in the first embodiment, so that the unit cores 202A and 202B are simultaneously The coil 6 can be wound.

  As described above, in the stator 201 according to the second embodiment, a convex portion is provided on one end surface of the unit core 202, a concave portion is provided on the other end surface, and the convex portion and the concave portion of the adjacent unit core 202 are fitted. Since it arrange | positions cyclically | annularly, it is easy to position between the unit cores 202, and joining by welding etc. is unnecessary.

Moreover, since the coil 6 is simultaneously wound around the two unit cores 202A and 202B, the productivity of the stator 201 can be improved.
In the second embodiment, the coil 6 is wound around the two unit cores 202 at the same time, but is not limited to two, and the coil 6 is wound around three or more unit cores 202 at the same time. It is good also as composition to do.

1,201 stator, 2,202 unit core, 3,3A-3C pole piece,
4 Thin-walled portion, 21, 221 Unit core end face, 22 convex portion, 23 concave portion,
31 Back yoke part, 32 teeth part, 41 notch part, 42 recessed part,
43 Chamfer, 6 coils, 7 frames, 44 protrusions.

Claims (8)

A plurality of magnetic pole pieces having a back yoke portion extending in the circumferential direction and a tooth portion protruding from the back yoke portion are connected to the outer peripheral side ends of the back yoke portions of the magnetic pole pieces arranged adjacent to each other. A notch having a bendable thin-walled portion, a concave portion provided on the outer peripheral side of the thin-walled portion, and a chamfered portion provided at both edge portions of the concave portion and having an inclination symmetrical to the bending line of the thin-walled portion. A stator core of a rotating electrical machine formed by bending the thin-walled portion of the unit core, and arranging the magnetic pole pieces in an annular shape,
Bending the thin-walled portion to the outer peripheral side, and placing the teeth portion that winds the coil back-warping in a direction away from the adjacent teeth portion,
A coil winding step of winding the coil around the teeth portion arranged in the reverse warp;
An annular arrangement step of arranging the magnetic pole piece in an annular shape by bending the thin-walled portion toward the inner peripheral side after the coil winding;
And a step of fitting the annularly arranged magnetic pole pieces into a cylindrical frame. In the reverse warping step, the tooth portion arranged adjacent to the tooth portion around which the coil is wound is outside the tooth extension line which is a boundary line with the back yoke portion of the tooth portion around which the coil is wound. The method of manufacturing a stator for a rotating electrical machine according to claim 1, wherein the stator is reversely warped to a position. 3. The rotating electrical machine according to claim 1, wherein in the coil winding step, a plurality of the unit cores arranged in a reverse warp are arranged, and the coils are wound around the plurality of unit cores simultaneously. Stator manufacturing method. A convex portion projecting in the circumferential direction is formed on the end face of the back yoke portion of the magnetic pole piece forming one end face of the unit core, and the end face of the back yoke portion of the magnetic pole piece forming the other end face of the unit core is A recess that fits with the protrusion is formed,
The manufacturing method of the stator of the rotary electric machine according to any one of claims 1 to 3, wherein in the annular arrangement step, the convex portions and the concave portions of the unit core are fitted and arranged in an annular shape. A plurality of magnetic pole pieces having a back yoke portion extending in the circumferential direction and a tooth portion protruding from the back yoke portion are connected to the outer peripheral side ends of the back yoke portions of the magnetic pole pieces arranged adjacent to each other. A notch having a bendable thin-walled portion, a concave portion provided on the outer peripheral side of the thin-walled portion, and a chamfered portion provided at both edge portions of the concave portion and having an inclination symmetrical to the bending line of the thin-walled portion. A unit core comprising:
A coil wound around the teeth portion;
A stator of a rotating electrical machine comprising: a cylindrical frame in which the plurality of magnetic pole pieces arranged in an annular shape by bending the thin-walled portion are inserted. The stator for a rotating electrical machine according to claim 5, wherein the recess of the notch has a substantially V-shaped cross section. A convex portion projecting in the circumferential direction is formed on the end face of the back yoke portion of the magnetic pole piece forming one end face of the unit core, and the end face of the back yoke portion of the magnetic pole piece forming the other end face of the unit core is The stator for a rotating electrical machine according to claim 5 or 6, wherein a concave portion that fits with the convex portion is formed. The stator of the rotating electrical machine according to any one of claims 5 to 7, wherein the material of the frame is a ferromagnetic material.

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