JP5754349B2 - Stator manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a stator for use in a rotating electrical machine, and more particularly, to a method for manufacturing a stator having insulating paper that is inserted into a slot and whose both ends overlap on the inner peripheral side.

Conventionally, a stator of a rotating electrical machine such as an electric motor or a generator is provided with an insulating paper as a ground insulating material between a stator coil outer peripheral surface and a slot inner peripheral surface wound in a slot provided in the stator core. It is mounted so as to surround the inner peripheral surface.
For example, in the technique of Patent Document 1, insulating paper wound around the stator coil is formed so as to surround the inner peripheral surface of the slot, and is divided so as to overlap at the opening on the inner peripheral side of the slot. The divided portion is bent in the opening direction at a portion facing the circumferential side surface of the slot, and further bent inward in the width direction so as to overlap both ends. Then, the insulating paper is inserted halfway into the slot so that the opening portion of the insulating paper is positioned in the opening on the inner peripheral side of the slot, and the stator coil is inserted through the opening portion of the insulating paper. A method for manufacturing a stator comprising a step of closing so that the openings overlap is disclosed. According to this method, the stator coil can be easily inserted from the wide opening portion, and the portions (both ends) of the insulating paper can be overlapped only by inserting the stator coil.

JP 2008-99375 A

However, in the technique of Patent Document 1, insulating paper that is inserted in the middle of a slot and bent at a portion facing the circumferential side surface of the slot in a direction in which the divided portion opens is pushed into the slot by a stator coil. Since this method is used, the insulating paper may be displaced from the slot when the stator coil is pushed in and inserted.
In order to prevent such displacement of the insulating paper, a method is conceivable in which the insulating paper is inserted into a male or female jig in advance and then moved into the slot of the stator core. For example, as shown in FIGS. 11A to 11C, the insulating paper Z11 is inserted into the female die 121 in a male shape 111 in a square shape, and then the insulating paper Z11 in the female die 121 is pushed out. It is conceivable to move the shaft in the axial direction and insert it into the slot of the stator. However, in this method, since both ends Z111 of the insulating paper overlap with each other on the inner peripheral side opening and the opening is closed, the male type 111 cannot be pulled back from the female type 121, and the male type 111 interferes. The insulating paper Z11 cannot be moved in the axial direction.
On the other hand, as shown in FIGS. 12A to 12C, the male paper 211 is inserted into the female mold 221 in a U-shape and the male mold 211 is pulled out, and then the both ends of the insulating paper. Although a method of bending Z211 is also conceivable, in this method, since there is no core metal, it is difficult to strongly fold both ends Z211 of the insulating paper.

  The present invention has been made to solve the above-described problems. By inserting the insulating paper having both ends bent into the stator while being guided by a jig, the stator is manufactured so that the insulating paper is not easily displaced during insertion. It aims to provide a method.

In order to solve the above problems, the stator manufacturing method of the present invention has the following configuration.
(1) A stator core having a plurality of slots opened on the inner peripheral side, insulating paper inserted into the slot and having both end portions overlapping on the inner peripheral side, and a stator coil wound via the insulating paper A method for manufacturing a stator having:
An insertion jig having a slot-like groove that is located in the axial direction of the stator and that opens to the inner circumferential side, a first pushing punch that advances and retreats radially into the slot-like groove, and a second pushing punch that advances and retracts in the axial direction. With
With the both end portions of the insulating paper folded back to the stator coil contact surface side, the central portion of the insulating paper is pushed from the inner circumferential side to the outer circumferential side by the first push punch, and the insulating paper is moved into the slot-like groove. An insulating paper inserting process to insert;
The slot-like groove and the slot are aligned in the axial direction, and the first pushing punch is pulled back partway to the inner peripheral side, and then the insulating paper inserted into the slot-like groove is used as the second pushing punch. And an insulating paper moving step of moving the insulating paper into the slot by pushing in from the axial direction.

(2) In the stator manufacturing method described in (1),
A crease is provided in the central portion of the insulating paper, and the first push punch includes a plate-like main body portion and a tip portion thicker in the circumferential direction than the main body portion.
(3) In the stator manufacturing method described in (2),
The main body portion of the first push punch is formed with an inclined surface that tapers in the axial direction from one side surface,
In the insulating paper moving step, one end of the folded back ends of the insulating paper precedes the other end and is spaced apart from the inclined surface of the first push punch and opens in the circumferential direction. And

Next, the operation and effect of the stator manufacturing method according to the present invention will be described.
(1) It has a stator core having a plurality of slots opened on the inner peripheral side, insulating paper inserted into the slot and overlapping at both ends on the inner peripheral side, and a stator coil wound through the insulating paper. A method for manufacturing a stator, comprising: a slot-like groove located in the axial direction of the stator and opened to the inner peripheral side; a first pushing punch that advances and retracts radially into the slot-like groove; and a second pushing that advances and retracts in the axial direction. An insertion jig having a punch is provided, and the center portion of the insulating paper is pushed from the inner peripheral side to the outer peripheral side by the first push punch in a state where both ends of the insulating paper are folded back to the stator coil contact surface side, and the insulating paper is Insulating paper insertion process for inserting into the slot-shaped groove, the slot-shaped groove and the slot are aligned in the axial direction, the first pushing punch is pulled back partway to the inner peripheral side, and then inserted into the slot-shaped groove Press the insulation paper second And the insulating paper moving step of moving the insulating paper into the slot by pushing it in the axial direction with a punch, so that the slot of the stator core is guided while the insulating paper whose both ends are bent is guided by the insertion jig. By inserting the insulating paper into the inside, there is an effect that the insulating paper is not easily displaced at the time of insertion.

Specifically, a slot-shaped groove that is positioned in the axial direction of the stator and that opens to the inner peripheral side, a first pressing punch that advances and retracts radially into the slot-shaped groove, and a second pressing punch that advances and retracts in the axial direction are provided. The insulating paper is provided with an insertion jig, and the central portion of the insulating paper is pushed from the inner circumferential side to the outer circumferential side by the first push punch in a state where both ends of the insulating paper are folded back to the stator coil contact surface side. Since there is an insulating paper inserting step for inserting into the slot, the insulating paper inserted into the slot-like groove of the insertion jig is formed in a U-shape, and both ends thereof are maintained in a folded state. Therefore, the first pushing punch can be pulled back to the inner peripheral side while leaving the insulating paper in the slot-like groove.
In addition, the slot-shaped groove and the slot are aligned in the axial direction, the first pressing punch is pulled back to the inner circumference partway, and then the insulating paper inserted into the slot-shaped groove is removed from the axial direction by the second pressing punch. Since the insulating paper moving step of pushing and moving the insulating paper into the slot is provided, the insulating paper with both ends bent can be accurately moved into the slot while being guided by the insertion jig. At this time, since the first pushing punch is pulled back partway to the inner peripheral side, the second pushing punch can advance and retreat in the axial direction without being obstructed by the first pushing punch.
Therefore, the insulating paper whose both end portions overlap on the inner peripheral side can be inserted into the slot without causing a positional shift.

(2) In the stator manufacturing method described in (1), a crease is provided in the central portion of the insulating paper, and the first push punch has a plate-like main body portion and a tip portion that is thicker in the circumferential direction than the main body portion. Since it is provided, the side surface of the insulating paper (between the fold line at the center and the fold line at both ends) forms a curved surface that curves toward the side surface of the main body of the push punch. Therefore, the insulating paper can be inserted into the slot-shaped groove of the insertion jig without the side surface of the insulating paper slidingly contacting the slot-shaped groove of the insertion jig.
Therefore, since the frictional resistance from the slot-like groove is not received on the side surface of the insulating paper, the possibility of causing the positional deviation of the insulating paper is further reduced when the insulating paper is inserted.

(3) In the stator manufacturing method described in (2), an inclined surface tapering in the axial direction from one side surface is formed on the main body portion of the first indentation punch. Since both ends of the folded back of the insulating paper are opened in the circumferential direction with one end leading away from the inclined surface of the first pushing punch in advance of the other end, both ends of the insulating paper When the insulating paper moves into the slots of the stator core, it can open and overlap on the inner peripheral side without interfering with each other. Therefore, since both ends of the insulating paper overlap on the inner peripheral side, a square shape can be reliably formed in the cross section.
Therefore, highly reliable insulation performance with insulating paper can be ensured between the stator core and the stator coil.

It is a fragmentary perspective view of the stator which is embodiment which concerns on this invention. It is a perspective view of the insulating paper inserted in the slot of FIG. It is BB sectional drawing of the insulating paper shown in FIG. It is explanatory drawing which shows the cuff folding method of the insulating paper shown in FIG. It is explanatory drawing which shows the both-ends folding method of the insulating paper shown in FIG. It is a schematic diagram for operation | movement description of the insertion jig used for the manufacturing method of the stator which is embodiment which concerns on this invention. It is an enlarged view when insulating paper is inserted in the stator-like groove in FIG. It is explanatory drawing which shows the method of moving an insulating paper in the slot of a stator. It is a perspective view when moving an insulating paper in a slot. It is a fragmentary perspective view which shows the state which inserted the insulating paper in the slot of the stator. It is explanatory drawing which inserts the insulating paper which bent both ends in the female type | mold. It is explanatory drawing explaining the method of bending both ends, after inserting insulating paper in a female type | mold.

Next, an embodiment of a stator manufacturing method according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a partial perspective view of a stator according to an embodiment of the present invention.
As shown in FIG. 1, the stator 10 has a donut shape having a predetermined thickness in the axial direction and the radial direction. A plurality of slots 7 having openings on the inner peripheral side are formed in the stator core 8 so as to penetrate in the axial direction. In the slot 7, a plurality of stator coils 9 having a rectangular cross section are stacked and wound. In order to ensure the ground insulation performance between the stator core 8 and the stator coil 9, the inner peripheral surface of the slot 7 is provided with an insulating paper Z in which the cross section of the inner surface is overlapped in a square shape. Yes. The insulating paper Z plays an important role in increasing the insulating performance necessary for reducing the size and increasing the output of the vehicular rotating electrical machine.

  In this embodiment, the insulating paper is preformed after being cut and then inserted into the insertion jig, and the insulating paper inserted into the insertion jig is moved from the axial direction into the slots of the stator core. And an insulating paper moving step to be inserted. Here, after describing the structure of the insulating paper, the insulating paper will be described in the order of cutting and pre-forming of the insulating paper, inserting the insulating paper into the insertion jig, and moving the insulating paper into the slot.

<Structure of insulating paper>
In the insulating paper of the present embodiment, both end portions on the inner peripheral side are overlapped in the radial direction, and the transverse cross section has a substantially square shape. FIG. 2 is a perspective view of the insulating paper inserted into the slot of FIG. FIG. 3 shows a cross-sectional view of the insulating paper shown in FIG.
As shown in FIGS. 2 and 3, the insulating paper Z has the upper and lower ends Z16 and Z17 in the axial direction cuffed with a predetermined width. The cuff-folded upper and lower ends Z16 and Z17 project from the upper and lower ends of the stator core 8 so that creeping discharge hardly occurs and the vertical movement of the insulating paper Z in the slot 7 is prevented.

Also, the insulating paper Z has both side surfaces Z13 and Z15 bent in a U-shape toward the inner peripheral side around the central portion Z14. Both end portions Z11 and Z12 of both side surfaces Z13 and Z15 are further bent so as to surround the stator coil 9, and are overlapped in the radial direction. By superimposing both ends in the radial direction, the periphery of the stator coil is surrounded by insulating paper to improve the insulation performance between the stator core and the rotor.
Of the two end portions Z11 and Z12, the end portion Z12 (one end portion) located on the radially inner side is longer in the circumferential direction than the end portion Z11 (the other end portion) located on the radially outer side. Further, of the side surfaces Z13 and Z15, the side surface (one side surface) Z13 continuing to one end Z12 is longer in the radial direction than the side surface (the other side surface) Z15 continuing to the other end Z11. Is long.
By providing a difference in the lengths of the both end portions Z11 and Z12 and both side surfaces Z13 and Z15, when the insulating paper Z is inserted into the slot 7, the both end portions Z11 and Z12 interfere with each other when opened from the folded state. I'm trying to avoid it.

In addition, each of the center portion Z14, both side surfaces Z13, Z15, and both end portions Z11, Z12 is bent at a right angle to form fold lines ZL1 to ZL4. Bending at a right angle increases the space factor of the stator coil 9.
As the insulating paper, a polyethylene naphthalate (PEN) film having a thickness of about 0.2 mm is used. When a non-woven fabric is bonded from both sides of the film to form a three-layer structure, the slip property is improved. For this reason, when the insulating paper is pushed into an insertion jig, which will be described later, the frictional resistance with the insertion jig is reduced, and the effect of being difficult to be displaced is obtained.

<Cutting and pre-forming of insulating paper>
The insulating paper cuts a coil wound in a roll shape into a predetermined length and preforms necessary portions. A crease is formed along the fold line. FIG. 4 is an explanatory diagram of the cuff folding method for the insulating paper shown in FIG. FIG. 5 is an explanatory diagram of a method for folding both ends of the insulating paper shown in FIG.
As shown in FIGS. 4A to 4C, the upper and lower ends are cuff-folded to a predetermined width while being rewound from the coil ZC of the insulating paper wound in a roll shape. The upper and lower ends Z16 and Z17 are cut into a predetermined length with the cuff folded. The direction in which the cuff is folded is opposite to the contact surface with the stator coil 9.
As shown in FIG. 5A, folds ZL1 to ZL4 are formed along the fold line on the insulating paper cut to a predetermined length. Thereafter, as shown in FIG. 5B, both end portions Z11 and Z12 are folded 180 degrees using a three-dimensional bending die 20 so as to overlap the contact surface side with the stator coil 9. By folding back 180 degrees, the creases at both ends Z11 and Z12 can be strongly applied. As shown in FIG. 5 (c), the preformed insulating paper ZY1 has upper and lower ends Z16, Z17 cuffed in the direction opposite to the contact surface with the stator coil, and both ends Z11, Z12 are in contact with the stator coil. It is folded 180 degrees to the surface side.

<Insulating paper insertion into the insertion jig>
The preformed insulating paper ZY1 is inserted into an insertion jig described below. FIG. 6 is a schematic diagram for explaining the operation of the insertion jig used in the stator manufacturing method according to the embodiment of the present invention. Fig. 6 (a) shows a state in which the pre-formed insulating paper is set between the male type and the female type, and Fig. 6 (b) shows that the male type is brought close to the female type and the insulating paper is shaped like a mountain. Fig. 6 (c) shows the state of molding, and Fig. 6 (c) shows the state where the first pressing punch is advanced and the insulating paper is inserted into the slot-shaped groove. Fig. 6 (d) shows that the first pressing punch is pulled out halfway. FIG. 6E shows a state in which the insulating paper is moved in the axial direction by the second push punch. FIG. 7 shows an enlarged view when insulating paper is inserted into the stator-like groove in FIG.

As shown in FIGS. 6 (a) and 6 (e), the insertion jig 100 includes a first push punch 1, a male die 2, an insulating paper storage portion 3, a female die 4, and a second push punch 5.
The male die 2 is formed with a flat top portion 23, a convex slope portion 22 that slopes from the top portion so as to spread toward the bottom, and a groove portion 21 that penetrates the center of the top portion 23 in the radial direction. In the groove portion 21, the first pushing punch 1 is fitted to the top portion 23 with the tips aligned. The first push punch 1 includes a plate-like main body 11 and a trapezoidal tip 12 that is thicker than the main body.
The female die 4 is formed with a groove portion 41 through which the first pushing punch 1 penetrates in the center in the radial direction and a concave inclined portion 42 for receiving the convex inclined portion 22 of the male die 2. An insulating paper storage unit 3 is connected to the back surface of the female die 4. A slot-like groove 31 having substantially the same shape as the slot groove formed in the stator and the groove width in the circumferential direction and the depth in the radial direction is formed in the insulating paper storage unit 3. The slot-like groove 31 communicates with a groove portion 41 through which the first pushing punch penetrates in the radial direction. The groove width of the slot-like groove 31 is wider than the groove width of the groove portion 41.
Four cutout grooves 33A1, 33A2, 33B1, and 33B2 are formed on both side surfaces of the slot-shaped groove 31 symmetrically toward the bottom surface 34. The notch grooves 33A1, 33A2, 33B1, and 33B2 are grooves through which convex pins 52 of the second push punch 5 described later pass in the axial direction.

As shown in FIG. 6A, the male mold 2 and the female mold 4 are separated from each other with the preformed insulating paper ZY1 interposed therebetween. The insulating paper ZY1 is held perpendicular to the radial direction by an insulating paper holding unit 6 (not shown).
Thereafter, as shown in FIG. 6B, the male mold 2 is moved in the direction of the arrow F so as to be close to the female mold 4. A part of the convex inclined portion 22 of the male mold 2 is received in the concave inclined portion 42 of the female mold 4. Between the concave inclined portion 42 of the female mold 4 and the convex inclined portion 22 of the male mold 2, the insulating paper ZY2 is formed in a mountain shape. At that time, both end portions Z11 and Z12 of the insulating paper are folded back at 180 degrees.
Next, as shown in FIGS. 6 (c) and 7, the first push punch 1 is moved in the direction of the arrow P, and the tip end portion 12 passes through the groove 41 of the female die 4, so that the insulating paper storage portion 3 It enters the slot-like groove 31. The central portion Z14 of the insulating paper pushed by the tip portion 12 of the first pushing punch 1 contacts the bottom surface 34 of the slot-like groove. The insulating paper ZY3 is formed in a U-shaped cross section in the slot-shaped groove, but both ends Z11 and Z12 of the insulating paper ZY3 are restricted to both side surfaces 11A and 11B of the main body 11 of the first push punch 1. Thus, the folded state remains 180 degrees at the folding lines ZL1 and ZL2.

Here, the thickness t2 of the tip 12 of the first push punch 1 is larger than the thickness t1 of the plate-like main body 11. The front end portion 12 includes a front end surface 12C that comes into contact with the central portion Z14 of insulating paper, and inclined surfaces 12A and 12B that incline from the front end surface toward both side surfaces 11A and 11B of the main body portion. In addition, a crease is formed in advance along the folding lines ZL13 and ZL14 in the central portion Z14 of the insulating paper. Therefore, the side surfaces Z13 and Z15 of the insulating paper ZY3 pushed by the tip 12 of the first push punch 1 are close to the both side surfaces 11A and 11B of the main body 11 of the first push punch 1 starting from the folding lines ZL13 and ZL14. To curve. Since the side surfaces Z13 and Z15 of the insulating paper ZY3 are curved toward both side surfaces of the main body, when the insulating paper ZY3 is pushed by the first push punch 1, the side surfaces Z13 and Z15 of the insulating paper ZY3 are the side walls of the slot-shaped groove 31. It does not contact 31A and 31B and does not receive frictional resistance during insertion.
Next, as shown in FIG. 6 (d), the first push punch 1 is moved in the direction of arrow R, and is pulled back to a position where the root of the leading end 12 abuts against both ends of the insulating paper ZY3. By extracting the first push punch 1 back, an insertion space for a second push punch 5 described later is provided. Even in this state, both ends Z11 and Z12 of the insulating paper ZY3 are regulated by the first push punch 1 and maintained in a state of being folded back 180 degrees.
Further, since the groove width of the groove portion 41 of the female die 4 is narrower than the groove width of the slot-like groove 31, the insulating paper ZY3 is stopped by the shoulder portion of the groove portion 41, and the slot-like groove 31 of the insulating paper storage portion 3. It is left as it is.

<Movement of insulating paper into the slot>
Next, as shown in FIG. 6E, the second pressing punch 5 moves the insulating paper ZY3 left in the slot-like groove 31 of the insulating paper storage unit 3 as it is in the direction perpendicular to the paper surface (axial direction). Then, it is inserted into the slot 7 of the stator core 8. The insulating paper ZY3 moves when one end of the cuff-folded portion is pushed by the convex pin 52 protruding from the tip of the second pushing punch 5. At this time, since the leading end 12 of the first pushing punch 1 is pulled back to a position where it abuts against both ends Z11 and Z12 of the insulating paper ZY3, the second pushing punch 5 interferes with the first pushing punch 1. And can enter in the axial direction.

Here, a method of opening both ends in the circumferential direction while moving the insulating paper ZY3 left in the slot-like groove 31 of the insulating paper storage unit 3 into the slot of the stator will be described. FIG. 8 is an explanatory diagram of a method for moving the insulating paper into the slots of the stator. FIG. 8A shows a state before movement, FIG. 8B shows a state during movement, and FIG. 8C shows a state after movement. FIG. 9 shows a perspective view when the insulating paper is moved into the slot. In FIG. 8, the shapes of the stator and the slot are omitted in order to make it easier to see how both ends of the insulating paper are opened in the circumferential direction.
As shown in FIG. 8A, the main body portion of the first push punch 1 is formed with an inclined surface 11 </ b> C that tapers from one side surface 11 </ b> B toward the lower end in the axial direction. The inclination angle K of the inclined surface C is set to provide a time difference when both ends of the insulating paper are opened in the circumferential direction, and the time difference increases as the inclination angle K decreases. There is no inclined surface on the other side surface 11A. Since the inclined surface 11C is formed only on one side surface 11B, the second pushing punch 5 is moved in the direction of the arrow V as shown in FIGS. When the insulating paper ZY4 is inserted, both ends Z11, Z12 folded back of the insulating paper move while sliding on the main body side surfaces 11A, 11B of the first push punch 1, and then one end of the folded both ends Z12 is separated from the inclined surface 11C of the first push punch 1 in advance of the other end Z11 and opens in the circumferential direction. In other words, at the position where one end Z12 opens in the circumferential direction, the other end Z11 at the opposite position is still restricted by the other side surface 11A and folded back 180 degrees. Therefore, one end Z12 and the other end Z11 open in the circumferential direction with a time difference. Since both end portions of the insulating paper open in the circumferential direction with a time difference in this way, even if the length in the circumferential direction is long, both end portions can be opened without interfering with each other and overlapped in the radial direction.

  By repeating the above operation for each slot, the insulating paper Z can be inserted into the plurality of slots 7 of the stator core 8 using the insertion jig 100 as shown in FIG. After that, as shown in FIG. 1, a plurality of rectangular stator coils 9 having a rectangular cross section are stacked and wound in the slot 7, so that the inner surface of the slot 7 has a rectangular cross section. A stator in which insulating paper Z in which both end portions on the inner peripheral side are overlapped can be manufactured.

<Effect>
As described above in detail, according to the stator manufacturing method according to the present embodiment, the stator core 8 having the plurality of slots 7 opened to the inner peripheral side, and the both ends Z11 and Z12 inserted into the slot 7. Is a method of manufacturing a stator 10 having insulating paper Z that overlaps on the inner peripheral side and a stator coil 9 wound via the insulating paper, and is positioned above the stator 10 in the axial direction and on the inner peripheral side. An insertion jig 100 having an open slot-like groove 31, a first pushing punch 1 that advances and retreats in the radial direction into the slot-like groove 31, and a second pushing punch 5 that advances and retreats in the axial direction is provided. Insulating paper insertion for inserting the insulating paper into the slot-like groove by pushing the central portion Z14 of the insulating paper from the inner peripheral side to the outer peripheral side with the first push punch 1 with Z11 and Z12 folded back to the stator coil contact surface side Craft Then, the slot-like groove 31 and the slot 7 are aligned in the axial direction, the first pushing punch 1 is pulled out partway to the inner peripheral side, and then the insulating paper inserted into the slot-like groove is put into the second pushing punch 5 And the insulating paper moving step of moving the insulating paper into the slot 7 by pushing it from the upper side to the lower side in the axial direction, so that the insulating paper in which both end portions Z11 and Z12 are bent is inserted by the insertion jig 100. By inserting into the slot 7 of the stator core 8 while guiding, there is an effect that the insulating paper is not easily displaced at the time of insertion.

Specifically, a slot-like groove 31 that is located in the axially upper direction of the stator 10 and that opens to the inner peripheral side, a first push punch 1 that advances and retreats radially into the slot-like groove, and a second that advances and retreats in the axial direction. An insertion jig 100 having a pressing punch 5 is provided, and the central portion Z14 of the insulating paper is surrounded by the first pressing punch 1 from the inner peripheral side with both end portions Z11 and Z12 of the insulating paper folded back to the stator coil contact surface side. Since the insulating paper is inserted into the slot-like groove 31 and pushed into the slot, the both ends Z11 and Z12 of the insulating paper inserted into the slot-like groove 31 of the insertion jig are folded back. Maintained. Therefore, the first pushing punch 1 can be pulled back to the inner peripheral side while leaving the insulating paper in the slot-like groove 31.
In addition, the slot-shaped groove 31 and the slot 7 are aligned in the axial direction, and the first pressing punch 1 is pulled back partway to the inner peripheral side, and then the insulating paper inserted into the slot-shaped groove 31 is inserted into the second pressing punch 31. 5 has an insulating paper moving step of pushing the insulating paper from the upper side to the lower side in the axial direction to move the insulating paper into the slot 7, so that the insulating paper in which both ends Z11 and Z12 are folded is accurately guided while being guided by the insertion jig 100. Can be moved into the slot 7. At this time, since the first pushing punch 1 is pulled back partway to the inner peripheral side, the second pushing punch 5 can advance and retreat in the axial direction without being obstructed by the first pushing punch 1.
Therefore, it is possible to insert the insulating paper in which both end portions Z11 and Z12 overlap on the inner peripheral side into the slot 7 in a state in which the positional deviation is difficult to occur.

Further, according to the present embodiment, the folds ZL3 and ZL4 are provided in the central portion Z14 of the insulating paper, and the first pushing punch 1 includes the plate-like main body portion 11 and the tip portion 12 that is thicker in the circumferential direction than the main body portion. Since the insulating paper has side surfaces Z13 and Z15 (between the folds at the center and the folds at both ends), the curved surfaces curved toward the main body side surfaces 11A and 11B of the first push punch 1 are provided. Form. Therefore, the insulating paper can be inserted into the slot-shaped groove of the insertion jig without the side surface of the insulating paper slidingly contacting the slot-shaped groove 31 of the insertion jig 100.
Therefore, the side faces Z13 and Z15 of the insulating paper are not subjected to the frictional resistance from the slot-like groove 31, so that the possibility of causing the positional deviation of the insulating paper is further reduced when the insulating paper is inserted.

Further, according to the present embodiment, the main body portion 11 of the first push punch 1 is formed with the inclined surface 11C that tapers from the one side surface 11B toward the lower end in the axial direction. The folded both ends Z11, Z12 move while sliding in contact with the main body side surfaces 11A, 11B of the first push punch 1, and one end Z12 of the folded both ends precedes the other end Z11. Since both ends Z11 and Z12 of the insulating paper move in the slot 7 of the stator core 8 because they are spaced apart from the inclined surface 11C of the first pushing punch 1 and open in the circumferential direction, They can open and overlap on the inner circumference without interference. Therefore, even if the widths of both end portions Z11 and Z12 of the insulating paper are long, they overlap on the inner peripheral side, so that a square shape can be reliably formed in the cross section of the insulating paper.
Therefore, highly reliable insulation performance by the insulating paper can be ensured between the stator core 8 and the like and the stator coil 9.

This embodiment mentioned above can be changed in the range which does not change the summary of this invention.
For example, in the present embodiment, the tip 12 of the first push punch 1 is thicker than the main body 11, but the tip 12 and the main body 11 may have the same thickness. Since the central portion of the insulating paper is creased in advance, even if the tip of the first push punch presses the inner side of the fold of the central portion, it will bend toward the side of the main body from the fold line with the crease. This is because the frictional resistance when inserting the insulating paper into the insertion jig does not increase so much.

  INDUSTRIAL APPLICABILITY The present invention can be used as a method for manufacturing a stator for use in a vehicular rotating electrical machine particularly used in an electric vehicle, a hybrid vehicle, and the like.

DESCRIPTION OF SYMBOLS 1 1st indentation punch 2 Male type 3 Insulating paper storage part 4 Female type 5 2nd indentation punch 6 Insulating paper holding part 7 Slot 8 Stator core 9 Stator coil 10 Stator 11 Main part of 1st indentation punch 12 Front end of 1st indentation punch Part 20 Three-dimensional bending die 31 Slotted groove 11C Inclined surface formed in the main body of the first indentation punch 100 Inserting jig Z Insulating paper Z11, Z12 Both ends of insulating paper Z14 Central part of insulating paper ZY1 Pre-formed insulation Paper ZY2-4 Insulation paper during pressing

Claims (3)

A stator core having a stator core having a plurality of slots opened on the inner peripheral side, insulating paper inserted into the slot and having both end portions overlapping on the inner peripheral side, and a stator coil wound through the insulating paper A manufacturing method comprising:
An insertion jig having a slot-like groove positioned in the axial direction of the stator and opened to the inner circumferential side, a first pushing punch that advances and retreats in the radial direction in the slot-like groove, and a second pushing punch that advances and retreats in the axial direction. With
With the both end portions of the insulating paper folded back to the stator coil contact surface side, the central portion of the insulating paper is pushed from the inner circumferential side to the outer circumferential side by the first push punch, and the insulating paper is moved into the slot-like groove. An insulating paper inserting process to insert;
The slot-like groove and the slot are aligned in the axial direction, and the first pushing punch is pulled back partway to the inner peripheral side, and then the insulating paper inserted into the slot-like groove is used as the second pushing punch. The stator is moved from the axial direction to move the insulating paper into the slot. In the manufacturing method of the stator according to claim 1,
A method for manufacturing a stator, wherein a crease is provided at a central portion of the insulating paper, and the first pressing punch includes a plate-like main body portion and a tip portion thicker in the circumferential direction than the main body portion. In the manufacturing method of the stator according to claim 2,
The main body portion of the first push punch is formed with an inclined surface that tapers in the axial direction from one side surface,
In the insulating paper moving step, one end of the folded back ends of the insulating paper precedes the other end and is spaced apart from the inclined surface of the first push punch and opens in the circumferential direction. A stator manufacturing method.

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