JP2022050264A - Coil insertion jig - Google Patents

Abstract

To provide a coil insertion jig capable of suppressing dropping of an insulating paper from a slot.SOLUTION: A blade arrangement jig is provided comprising a blade 62 that is inserted into an inside of an insulating paper 30 and is used for insertion of a segment coil into the inside of the insulating paper 30, wherein the insulating paper 30 is arranged facing an inner wall surface 14s of a slot having radial depth and provided in an inner periphery of a stator core 12, and wherein (a) a length in a longitudinal direction, of the blade is longer than length Ds in a direction of an axis line C, of the stator core, and (b) a diametrical length of all of an axis portion 62b of the blade is longer than the diametrical length of a segment coil. The number of times of inserting the segment coil into an inside of the insulating paper can be reduced, and the generation of the dropping of the insulating paper from the slot due to the contact between the segment coil and the insulating paper is suppressed to secure an insulation quality.SELECTED DRAWING: Figure 6

Description

The present invention relates to a coil insertion jig in which an insulating paper is arranged facing the inner wall surface of a slot and a segment coil is inserted inside the insulating paper.

A method in which insulating paper is arranged facing the inner wall surface of a slot having a radial depth of the stator core provided on the inner peripheral surface of the stator core, and a segment coil is inserted inside the insulating paper using a blade. It has been known. For example, the method of inserting a segment coil described in Patent Document 1 is that.

Japanese Unexamined Patent Publication No. 2013-102569

The method of inserting the segment coil described in Patent Document 1 is a method of inserting the segment coil one by one inside the insulating paper arranged in the slot. Therefore, in the radial direction of the stator core, the length of the blade of the coil insertion jig is only the length of one segment coil. When the blade is inserted inside the insulating paper and then guided by the blade and the segment coil is repeatedly inserted inside the insulating paper, the contact between the segment coil and the insulating paper causes the insulating paper from inside the slot. There is a risk of omission.

The present invention has been made in the background of the above circumstances, and an object of the present invention is to provide a coil insertion jig capable of suppressing the insulating paper from coming out of the slot.

The gist of the first invention is the inside of the insulating paper disposed facing the inner wall surface of the slot having a depth in the radial direction provided on the inner peripheral surface of the stator core extending in a cylindrical shape about the axis. A coil insertion jig comprising a blade inserted into the insulating paper and for inserting a segment coil inside the insulating paper. (A) The longitudinal length of the blade is the axial length of the stator core. (B) The radial length of the blade is longer than the radial length of the segment coil.

According to the coil insertion jig of the first invention, (a) the length of the blade in the longitudinal direction is longer than the length of the stator core in the axial direction, and (b) the length of the blade in the radial direction is It is longer than the radial length of the segment coil. By using a coil insertion jig having a blade whose radial length of the blade is longer than the radial length of the segment coil, the insulating paper is guided by the blade after the blade is inserted inside the insulating paper. Even if multiple segment coils are inserted inside at the same time, the contact between the segment coils and the insulating paper is reduced. Therefore, the number of times the segment coil is inserted into the insulating paper can be reduced, and the occurrence of the insulating paper coming out of the slot due to the contact between the segment coil and the insulating paper can be suppressed and the insulating property can be ensured.

The gist of the second invention is that, in the first invention, the radial length of the blade is the sum of the radial lengths of the plurality of segment coils simultaneously inserted inside the insulating paper. To be longer than. When a blade whose radial length is longer than the total radial length of multiple segment coils inserted at the same time is used, the segment coil when the segment coil is inserted inside the insulating paper compared to the case where it is not. The contact with the insulating paper is easily reduced, and the occurrence of the insulating paper coming out of the slot is easily suppressed.

The gist of the third invention is that in the first invention or the second invention, (a) the blade is the stator core of the inner wall surface of the slot when the blade is inserted inside the insulating paper. It has a positioning unit that positions both sides facing each other in the circumferential direction, and (b) the radial length of the positioning unit is the diameter of the plurality of segment coils simultaneously inserted inside the insulating paper. It is longer than the total length of the direction. When a blade with a positioning portion whose radial length is longer than the total radial length of multiple segment coils inserted at the same time is used, when the segment coil is inserted inside the insulating paper as compared to the case where it is not. The contact between the segment coil and the insulating paper is easily reduced, and the occurrence of the insulating paper coming out of the slot is easily suppressed.

The gist of the fourth invention is that, in the third invention, (a) the blade has a protrusion having a width narrower than that of the positioning portion in the circumferential direction, and (b) the protrusion in the radial direction. The portion is to project toward the inner peripheral side from the positioning portion. The positioning portion of the blade positions the slot with respect to the coil insertion jig, but the blade has a protruding portion that protrudes from the positioning portion to the inner peripheral side, so that the rigidity of the blade is higher than that without the protruding portion. Is enhanced. As a result, for example, the shaking of the blade is suppressed, so that the accuracy in which the slot (stator core) is positioned with respect to the positioning portion of the blade is improved. Therefore, the position accuracy of the stator core with respect to the segment coil is also improved. Therefore, as compared with the case where the blade does not have a protruding portion, it becomes easier to suppress the occurrence of the insulating paper coming out of the slot due to the contact between the segment coil and the insulating paper.

It is a perspective view explaining the schematic structure of the stator of the rotary electric machine for a vehicle manufactured by using the blade arrangement jig which concerns on this invention. It is a figure explaining the method of winding the stator coil around the stator core of the rotary electric machine for vehicles shown in FIG. 1, and (a) is the perspective view which showed the state which the insulating paper was arranged in the slot of the stator core. , (B) is a perspective view of the segment coil, and (c) is a state in which the segment coil is inserted inside the insulating paper arranged in the slot of the stator core, and is expanded in the circumferential direction in the stator core to the inner peripheral side. It is a figure which looked at the outer peripheral side from the inner peripheral side, and (d) is the figure which expanded the state which connected the segment coil by welding in the circumferential direction in the stator core, and looked at the outer peripheral side from the inner peripheral side. It is a perspective view of the blade arrangement jig. It is a perspective view of a blade. It is a figure explaining the shape of the shaft part of a blade. It is a figure explaining the blade insertion process. It is a figure explaining the segment coil contact process. It is a figure explaining the segment coil insertion process. It is an example of the flowchart of each process explaining the method of inserting a segment coil into a slot.

Hereinafter, examples of the present invention will be described in detail with reference to the drawings. In the examples described below, the figures are appropriately simplified or modified for ease of understanding, and the dimensional ratios and shapes of each part are not always accurately drawn.

FIG. 1 is a perspective view illustrating a schematic configuration of a stator 10 of a rotary electric machine MG for a vehicle manufactured by using the blade arrangement jig 60 according to the present invention.

The rotary electric machine MG for vehicles is a rotary electric machine having a function as an electric motor (motor) and a function as a generator (generator) mounted on, for example, a hybrid vehicle or an electric vehicle, and is a so-called motor generator. The rotary electric machine MG for a vehicle is, for example, a drive source for traveling a vehicle. The rotary electric machine MG for a vehicle includes a cylindrical stator 10 centered on an axis C, which is a rotation center line, and a rotor (not shown) arranged on the inner peripheral side of the stator 10. The rotor is made rotatable by the rotating magnetic field generated by the stator 10.

The stator 10 includes a stator core 12, a stator coil 18, and a power line 20. The stator core 12 is formed by laminating a plurality of electrical steel sheets and extending in a cylindrical shape around the axis C. The inner peripheral surface of the cylindrical stator core 12 has a plurality of grooves (48 in the case of this embodiment) having a depth in the radial direction of the stator core 12 and penetrating in the axis C direction. That is, the slots 14 are provided at equal-angle intervals (in the case of this embodiment, the equal-angle intervals of 2π / 48 [rad]). A tooth portion 16 is formed between the adjacent slots 14. A stator coil 18 is wound around the tooth portion 16. Hereinafter, in the present specification, the "direction parallel to the axis C", the "diametrical direction of the stator core 12", and the "circumferential direction of the stator core 12" are simply referred to as "axis C direction", "diameter direction", and "circumferential direction", respectively. Direction ".

The stator coil 18 is, for example, a U-phase, V-phase, and W-phase three-phase winding, and the end of each stator coil 18 is electrically connected to the power line 20. An external terminal 22 for connecting to an inverter or the like (not shown) is attached to the tip of the power line 20.

2A and 2B are views for explaining a method of winding the stator coil 18 around the stator core 12 of the rotary electric machine MG for vehicles shown in FIG. 1, and FIG. 2A is a diagram in which the insulating paper 30 is arranged in the slot 14 of the stator core 12. It is a perspective view which showed the state, (b) is the perspective view of the segment coil 40, (c) is inserted the segment coil 40 inside the insulating paper 30 arranged in the slot 14 of a stator core 12. It is a figure which expanded in the circumferential direction in the stator core 12 and looked at the outer peripheral side from the inner peripheral side, and (d) expanded the state which connected the segment coils 40 by welding in the circumferential direction in the stator core 12. It is the figure which looked at the outer peripheral side from the inner peripheral side.

As shown in FIG. 2A, the stator core 12 is held by a holder (not shown) so that the axis C is parallel to the vertical line. Insulating paper 30 is arranged in the slot 14 provided in the stator core 12. The slot 14 has an inner wall surface including a pair of groove side surfaces 14s (see FIG. 5) facing in the circumferential direction and a groove bottom surface 14b (see FIG. 5) connecting the outer peripheral end of the pair of groove side surfaces 14s. Have. The pair of groove side surfaces 14s are both side surfaces of the inner wall surface of the slot 14 facing in the circumferential direction. The insulating paper 30 is, for example, a groove-shaped sheet-shaped insulating member capable of contacting a pair of groove side surfaces 14s and a groove bottom surface 14b in the inner wall surface of the slot 14. That is, the insulating paper 30 is arranged so as to face the inner wall surface of the slot 14. The insulating paper 30 is for ensuring insulation between the segment coil 40 inserted inside the insulating paper 30 (that is, the inside of the groove of the groove-shaped insulating paper 30) and the slot 14 (stator core 12). .. Preferably, the insulating paper 30 contains an adhesive (for example, a foamed adhesive resin) for fixing the segment coil 40 on the surface layer or the inner layer thereof, but does not contain the adhesive. May be there.

As shown in FIG. 2B, the segment coil 40 is composed of a so-called flat conductor having a rectangular cross section, such as a longitudinal conductor plate, on which an insulating film such as enamel is formed on the surface. The segment coil 40 is bent into a substantially U shape. The segment coil 40 has a pair of arm portions 42 extending linearly in the same direction on the left and right sides of the U-shape, and a connecting portion 44 connecting the root portions of the pair of arm portions 42 to each other. The insulating coating is removed from each of the tip portions 42a of the pair of arm portions 42. In the segment coil 40, the surface of each tip of the pair of arm portions 42 is the tip surface 42t.

As shown in FIG. 2C, the arm portion 42 of the segment coil 40 is inserted inside the insulating paper 30 in a state where the insulating paper 30 is arranged in the slot 14. As a result, the tip portion 42a of the segment coil 40 is in a state of protruding from the end portion 12t2 (lower end face in FIG. 2C) of the stator core 12. Further, the insulating paper 30 is disposed between the inner wall surface of the slot 14 and the arm portion 42 of the segment coil 40.

As shown in FIG. 2D, the tip end portion 42a of the segment coil 40 is bent in the circumferential direction in the stator core 12. Then, one of the tip portions 42a of one segment coil 40 and one of the tip portions 42a of the other segment coil 40 are welded. By electrically connecting the tip portions 42a of the plurality of segment coils 40 to each other by welding in this way, the stator coil 18 wound around the tooth portions 16 is formed. Welding is, for example, TIG (Tungsten Inert Gas) welding.

Although the method of winding the stator coil 18 is conceptually described in FIG. 2, in reality, all the segment coils 40 are finally inserted into the slots 14 in an annular shape, and these plurality of segment coils are formed. The stator coil 18 is formed by welding the 40s to each other.

From here, a method of inserting the arm portion 42 of the segment coil 40 into the insulating paper 30 disposed in the slot 14 will be specifically described.

FIG. 3 is a perspective view of the blade arrangement jig 60. The blade arrangement jig 60 corresponds to the "coil insertion jig" in the present invention. In the method of inserting the segment coil 40 inside the insulating paper 30, the blade arrangement jig 60 is arranged directly under the stator core 12 held by a holder (not shown). The blade arrangement jig 60 has a disk-shaped portion having the axis C of the stator core 12 as a common center line, and the disk-shaped portion is inserted into the inside of the insulating paper 30 arranged in each slot 14. A plurality of possible (48 in the case of this embodiment) blades 62 are arranged in an annular shape at equiangular intervals (in the case of this embodiment, 2π / 48 [rad] equiangular intervals). A plurality of blades 62 are arranged at positions corresponding to the plurality of slots 14 provided in the stator core 12 when viewed in the axis C direction. The plurality of blades 62 arranged in an annular shape on the blade arrangement jig 60 are configured to be integrally movable up and down by, for example, an actuator for raising and lowering (not shown). Further, each blade 62 is configured to be movable in the radial direction by, for example, an actuator for radial movement (not shown).

FIG. 4 is a perspective view of the blade 62. The blade 62 guides the arm portion 42 of the segment coil 40 to the inside of the insulating paper 30 while supporting the tip surface 42t of the arm portion 42 of each segment coil 40 after being inserted through the inside of the insulating paper 30. Is.

The blade 62 includes a root portion 62a and a shaft portion 62b. Both the root portion 62a and the shaft portion 62b extend in a columnar direction in the longitudinal direction (above the axis C direction in the blade arrangement jig 60). In the longitudinal direction, the root portion 62a is a portion on the side where the blade 62 is fixed to the disk-shaped portion of the blade arrangement jig 60, and the shaft portion 62b is a portion extending from the root portion 62a to the tip end side. The surface of the tip of the shaft portion 62b is the tip surface 62t. The shaft portion 62b is a portion to be inserted inside the insulating paper 30 arranged in the slot 14, and is configured to have a size that can be inserted inside the insulating paper 30.

The shaft portion 62b has a positioning portion 62w and a protruding portion 62n. The positioning portion 62w is a portion that positions a pair of groove side surfaces 14s on the inner wall surface of the slot 14 when the shaft portion 62b of the blade 62 is inserted inside the slot 14. Preferably, the positioning portion 62w also positions the groove bottom surface 14b located on the outer peripheral side of the inner wall surface of the slot 14. The protruding portion 62n is a portion whose width in the circumferential direction is narrower than that of the positioning portion 62w and protrudes from the positioning portion 62w toward the inner peripheral side. In addition, "positioning" means that when the blade 62 is inserted inside the insulating paper 30 arranged in the slot 14 of the stator core 12, the position of the slot 14 corresponds to the position of the blade 62. It is to be moved (adjusted).

FIG. 5 is a diagram illustrating the shape of the shaft portion 62b of the blade 62. FIG. 5 shows a cross section perpendicular to the axis C in the shaft portion 62b inserted from below inside the insulating paper 30 disposed in the slot 14, and insulation disposed in one slot 14 for comparison. A cross-sectional view of a plurality of (8 in the case of this embodiment) segment coils inserted inside the paper 30 perpendicular to the axis C is shown as viewed from above. The vertical plane P is a surface including the axis C and passing through the center of the slot 14 in the width direction (the same direction as the circumferential direction). In this embodiment, eight segment coils 40 are finally inserted inside the insulating paper 30 arranged in one slot 14, but the eight segment coils 40 are on the outer peripheral side. It is inserted in two parts, four located at the center and four located on the inner peripheral side. In the circumferential direction, the positioning portion 62w has a width Wb1 [mm], and the protruding portion 62n has a width Wb2 [mm] (<Wb1). In the radial direction, the positioning portion 62w has a length Lb1 [mm], and the protruding portion 62n has a length Lb2 [mm]. The radial length of the entire shaft portion 62b of the blade 62 is the length Lb [mm] (= Lb1 + Lb2). The radial length Lb of the entire shaft portion 62b corresponds to the "diametrical length of the blade" in the present invention. The circumferential width (Wb1, Wb2) of the shaft portion 62b is smaller than the width of the gap obtained by removing the thickness of the insulating paper 30 from the circumferential width Ws1 [mm] of the slot 14. The circumferential width Ws1 of the slot 14 is the distance between the pair of groove side surfaces 14s facing each other in the slot 14. The root portion 62a is thicker in the circumferential direction and the radial direction than the shaft portion 62b, and has higher rigidity than the shaft portion 62b.

The tip portion 16a on the inner peripheral side of the tooth portion 16 of the stator core 12 facing each other in the circumferential direction narrows the opening on the inner peripheral side of the slot 14, respectively. That is, the width in the circumferential direction in the slot 14 is narrowed to the width Ws2 [mm] (<Ws1) by the pair of tip portions 16a facing each other on the inner peripheral side. In the radial direction, the distance from the opening on the inner peripheral side of the slot 14 narrowed by the tip portion 16a to the groove bottom surface 14b, that is, the radial length of the slot 14 is the length Ls [mm]. As described above, the slot 14 has a space partitioned by the width Ws1 in the circumferential direction and the length Ls in the radial direction. The width Ws2 is larger than the width Wb2 of the protrusion 62n. The width Ws2 is larger than the width Wb2 plus the thickness of the insulating paper 30 (the thickness of two insulating papers 30 arranged on both sides in the circumferential direction at the opening on the inner peripheral side of the slot 14). ..

In each of the arm portions 42 of the plurality of segment coils 40 inserted inside the insulating paper 30 arranged in one slot 14, the width in the circumferential direction is the width Wc1 [mm] and the length in the radial direction. Is a length Lc [mm]. Further, the width in the circumferential direction of the longitudinal conductor plate of the segment coil 40 (the same as the width in the circumferential direction at the tip portion 42a) is the width Wc2 [mm]. A plurality of (8 in the case of this embodiment) segment coils 40 can be inserted inside the insulating paper 30 arranged in one slot 14. Therefore, the width Wc1 of the segment coil 40 is obtained by subtracting the thickness of the insulating paper 30 (the thickness of two sheets of the insulating paper 30 facing the inner wall surfaces on both sides in the circumferential direction) from the width Ws1 of the slot 14. Is also small. For example, the width Wc2 of the tip portion 42a of the segment coil 40 is configured to be smaller than the width Wb1 of the positioning portion 62w of the blade 62. By making the width Wc2 smaller than the width Wb1, when the segment coil 40 is inserted into the slot 14, the edge of the tip surface 42t of the segment coil 40 is suppressed from coming into contact with the insulating paper 30. Further, the radial length of the entire plurality of segment coils 40 finally inserted inside the insulating paper 30 arranged in one slot 14 (in the case of this embodiment, Lc × 8 [pieces]). ) Is obtained by subtracting the thickness of the insulating paper 30 (the thickness of two sheets of the insulating paper 30 facing the inner wall surfaces on the outer peripheral side and the inner peripheral side in the radial direction) from the length Ls of the slot 14. small.

The radial length Lb1 of the positioning portion 62w of the blade 62 is larger than the radial length Lc (<Lb1) in the segment coil 40. Further, the radial length Lb1 of the positioning portion 62w is larger than the radial length (Lc × 4 [pieces]) of the entire four segment coils 40 that are simultaneously inserted at the same time. The radial length Lb of the entire shaft portion 62b of the blade 62 is larger than the radial length Lc (<Lb) of the segment coil 40. Further, the radial length Lb is larger than the radial length (Lc × 8 [pieces]) of the entire eight segment coils 40 finally inserted into one slot 14.

From here, the manufacturing method of the stator 10 will be described in detail.

The method for manufacturing the stator 10 includes each of these steps in the order of the blade insertion step P1, the segment coil contact step P2, and the segment coil insertion step P3. As described above, in the present embodiment, the eight segment coils 40 to be finally inserted are divided into four times, four located on the outer peripheral side and four located on the inner peripheral side, of the insulating paper 30. It is inserted inside.

FIG. 6 is a diagram illustrating the blade insertion step P1. FIG. 6 (same for FIGS. 7 and 8) is a view of the outer peripheral side in the radial direction from the axis C side by expanding the cross section obtained by cutting the stator core 12 in the circumferential direction by the cutting line VI-VI shown in FIG. be. FIG. 6 (same for FIGS. 7 and 8) shows one slot 14 representing a plurality of slots 14. The stator core 12 is held by a holder (not shown) so that the axis C is parallel to the vertical line. The slot 14 extends in the axis C direction.

Before the blade insertion step P1, the insulating paper 30 is arranged so as to face the pair of groove side surfaces 14s on the inner wall surface of the slot 14. A part of the insulating paper 30 is arranged so as to protrude from the end portion 12t1 (upper end face in FIG. 6) of the stator core 12 in the axis C direction. Although not shown in FIG. 6, the insulating paper 30 is arranged so as to face the groove bottom surface 14b on the inner wall surface of the slot 14 (see FIG. 5).

In the blade insertion step P1, the blade arrangement jig 60 is raised so that the plurality of blades 62 provided on the blade arrangement jig 60 are integrally raised in the direction of the arrow D1. As a result, the blades 62 are inserted inside the insulating paper 30. In the radial direction, the position of the positioning portion 62w of the blade 62 is located on the outer peripheral side in the slot 14 (see FIG. 5). The plurality of blades 62 provided on the blade arrangement jig 60 are fixed so as not to be movable in the same horizontal plane, for example, to be non-rotatable in the circumferential direction. On the other hand, the stator core 12 is held in a so-called floating state by a holder (not shown), and can be freely moved within an allowable range in the same horizontal plane by a force received from the outside (for example, a force received from the blade 62). ..

For example, the stator core 12 is held in a floating state in the circumferential direction so as to be freely rotatable in the circumferential direction. As a result, when the blade 62 is inserted inside the insulating paper 30 arranged in the slot 14 of the stator core 12, the positioning portion 62w is inserted between the pair of groove side surfaces 14s of the slot 14, so that the circumference thereof The stator core 12 is rotated so that the positions of the slots 14 are aligned with the positions of the plurality of blades 62 in the direction. That is, positioning in the circumferential direction is performed so that the position of the slot 14 corresponds to the position of the blade 62.

For example, since the stator core 12 is held in a horizontally movable state that can be freely moved in the same horizontal plane, the blade 62 is inserted inside the insulating paper 30 disposed in the slot 14 of the stator core 12. In this case, the stator core 12 is inserted so that the outer peripheral surface of the positioning portion 62w faces the groove bottom surface 14b of the slot 14 so that the positions of the slots 14 are aligned with the positions of the plurality of blades 62 in the radial direction. Be moved. That is, radial positioning is performed so that the position of the slot 14 corresponds to the position of the blade 62.

By inserting the blade 62 inside the insulating paper 30, the insulating paper 30 can be expanded in the slot 14. In the blade insertion step P1, the plurality of blades 62 are raised to a position where the tip surface 62t of each blade 62 reaches the inside of the groove portion 52 provided in the coil guide 50. That is, the tip surface 62t of each blade 62 is projected from the end portion 12t1 of the stator core 12. The length Db [mm] in the longitudinal direction of the shaft portion 62b inserted inside the insulating paper 30 is longer than the length Ds [mm] in the axis C direction of the stator core 12. In this way, in the axis C direction, the blade 62 is inserted inside the insulating paper 30 from below. The length Db corresponds to the "length in the longitudinal direction of the blade" in the present invention. The "longitudinal length of the blade" in the present invention is the longitudinal length of the portion (shaft portion 62b) of the blade 62 inserted inside the insulating paper 30.

FIG. 7 is a diagram illustrating the segment coil contact step P2.

Before the segment coil contact step P2, the coil guide 50 is arranged directly above the stator core 12 in the axis C direction. The coil guide 50 guides the tip portion 42a of each segment coil 40 descending from above to the tip surface 62t of the blade 62 that is inserted through the inside of the insulating paper 30 by passing through the groove portion 52. be. The groove portion 52 provided in the coil guide 50 is a space penetrating in the radial direction and the axis C direction. The position of the groove 52 of the coil guide 50 corresponds to the position of the slot 14 when viewed in the axis C direction.

Immediately before the segment coil contact step P2, four segment coils 40 located on the outer peripheral side before being inserted inside the insulating paper 30 in the segment coil insertion step P3 are combined in an annular shape above the stator core 12. It is arranged in the state. Each segment coil 40 is arranged so that the tip portion 42a of the arm portion 42 faces downward. In the segment coil contact step P2, the four segment coils 40 located on the outer peripheral side in the state of being combined in an annular shape are integrally lowered in the direction of the arrow D2. By lowering the arm portion 42 of the segment coil 40, the tip portion 42a of the segment coil 40 is inserted into the groove portion 52 of the coil guide 50, and the tip surface 42t of each segment coil 40 is the tip surface of the positioning portion 62w of the blade 62. It abuts on 62t, that is, it contacts the tip surface 62t. In this segment coil contact step P2, the circumferential direction of the tip portion 42a of the segment coil 40 is the circumferential direction of the positioning portion 62w of the blade 62 when viewed from above in the direction of the vertical line in which the segment coil 40 is inserted. It is within the range. That is, in the circumferential direction, the tip portion 42a of the segment coil 40 does not protrude from the positioning portion 62w of the blade 62. The tip surface 62t of the blade 62 is a surface facing the tip surface 42t of the segment coil 40 to be inserted in the segment coil contact step P2 and the segment coil insertion step P3.

FIG. 8 is a diagram illustrating a segment coil insertion step P3.

As shown in FIG. 8, in a state where the tip surface 42t of the arm portion 42 abuts on the tip surface 62t of the blade 62, the arm portion 42 of the segment coil 40 and the blade 62 are synchronized and the inside of the slot 14 is integrated. By descending in the direction of the arrow D3 and the arrow D4, the arm portion 42 of the four segment coils 40 located on the outer peripheral side is inserted inside the insulating paper 30 and penetrates the slot 14. By this integrally lowering, the blade 62 protects the insulating paper 30 from the edge of the tip surface 42t of the segment coil 40. In the segment coil insertion step P3, the blade 62 and the segment coil 40 are lowered in synchronization with the tip portion 42a of the segment coil 40 not protruding from the positioning portion 62w of the blade 62, so that the tip surface 42t of the segment coil 40 The segment coil 40 is inserted inside the insulating paper 30 so that the edge of the is not caught by the insulating paper 30. When the arm portion 42 of the segment coil 40 penetrates the slot 14, the blade 62 is further lowered and separated from the tip surface 62t of the blade 62 and the tip surface 42t of the arm portion 42.

In this way, the four segment coils 40 are collectively inserted into the insulating paper 30 arranged in the slot 14 from the outermost peripheral side.

Next, each blade 62 arranged in the blade arrangement jig 60 is moved by four (Lc × 4 [pieces]) of the segment coils 40 located on the outer peripheral side inserted into the inner peripheral side in the radial direction. Be done. As a result, in the radial direction, the position of the positioning portion 62w of the blade 62 is located on the inner peripheral side in the slot 14. The same procedure as the blade insertion step P1, the segment coil contact step P2, and the segment coil insertion step P3 described above is repeated, except that the segment coils 40 to be inserted are four located on the inner peripheral side. .. In this way, the four segment coils 40 are collectively inserted into the insulating paper 30 arranged in the slot 14 from the innermost peripheral side. When eight segment coils 40 are inserted into one slot 14 one by one, the insertion of the segment coils 40 into the insulating paper 30 is repeated eight times, whereas in this embodiment, eight Since the segment coils 40 are inserted four by four, the segment coils 40 are inserted into the insulating paper 30 only twice.

In this way, after the eight segment coils 40 are inserted from the outermost peripheral side to the innermost peripheral side of the slot 14, the stator coil 18 shown in FIG. 1 is subjected to the welding described with reference to FIG. 2 (d). Is manufactured.

FIG. 9 is an example of a flowchart of each step for explaining a method of inserting the segment coil 40 into the slot 14. The flowchart of FIG. 9 is repeatedly executed each time the segment coil 40 is inserted inside the insulating paper 30 arranged in the slot 14.

First, the blade insertion step P1 is carried out in step S10. Then, the segment coil contact step P2 is carried out in step S20, and the segment coil insertion step P3 is carried out in step S30. And it becomes a return.

According to this embodiment, (a) the length Db in the longitudinal direction of the blade 62 is longer than the length Ds in the axis C direction of the stator core 12, and (b) the length in the radial direction of the entire shaft portion 62b of the blade 62. Lb is longer than the radial length Lc of the segment coil 40. By using a blade arrangement jig 60 having a blade 62 in which the radial length Lb of the entire shaft portion 62b of the blade 62 is longer than the radial length Lc of the segment coil 40, the blade is used inside the insulating paper 30. Even if a plurality of (4 in the case of this embodiment) segment coils 40 are simultaneously inserted inside the insulating paper 30 guided by the blade 62 after the 62 is inserted, the segment coils 40 and the insulating paper 30 are still in contact with each other. Contact is reduced. Therefore, the number of times the segment coil 40 is inserted into the insulating paper 30 can be reduced, and the occurrence of the insulating paper 30 coming out of the slot 14 due to the contact between the segment coil 40 and the insulating paper 30 is suppressed and the insulating property is improved. Can be secured. Further, in the segment coil inserting step P3 in which the segment coil 40 is inserted inside the insulating paper 30, the frictional force between the segment coil 40 and the insulating paper 30 is reduced, so that the load on the segment coil 40 at the time of insertion is reduced. Therefore, the occurrence of defects in the process is suppressed. Since the generation of foreign matter due to the contact between the segment coil 40 and the insulating paper 30 is also suppressed, the quality of connecting the segment coils 40 to each other by welding, which is carried out after the segment coil insertion step P3, is improved.

According to the present embodiment, the radial length Lb of the entire shaft portion 62b of the blade 62 is the segment coil 40 of a plurality of (4 in the case of the present embodiment) simultaneously inserted inside the insulating paper 30. It is longer than the total length in the radial direction (Lc × 4 [pieces]). When the blade 62 whose entire shaft portion 62b is longer than the total radial length of the four segment coils 40 inserted at the same time is used, the segment coil 40 is made of the insulating paper 30 as compared with the case where the blade 62 is not used. The contact between the segment coil 40 and the insulating paper 30 when inserted inward is likely to be reduced, and the occurrence of the insulating paper 30 coming off from the slot 14 is likely to be suppressed.

According to this embodiment, (a) the blade 62 positions a pair of groove side surfaces 14s of the inner wall surface of the slot 14 facing the circumferential direction of the stator core 12 when the blade 62 is inserted inside the insulating paper 30. (B) The radial length Lb1 of the positioning portion 62w is a plurality of (4 in the case of this embodiment) segment coils 40 simultaneously inserted inside the insulating paper 30. It is longer than the total length in the radial direction (Lc × 4 [pieces]). When the blade 62 having the positioning portion 62w whose radial direction is longer than the total radial length of the four segment coils 40 inserted at the same time is used, the segment coil 40 is made of the insulating paper 30 as compared with the case where it is not used. The contact between the segment coil 40 and the insulating paper 30 when inserted inward is likely to be reduced, and the occurrence of the insulating paper 30 coming off from the slot 14 is likely to be suppressed.

According to this embodiment, (a) the blade 62 has a protruding portion 62n whose width in the circumferential direction is narrower than that of the positioning portion 62w, and (b) in the radial direction, the protruding portion 62n has an inner circumference from the positioning portion 62w. It protrudes to the side. The positioning portion 62w of the blade 62 positions the slot 14 with respect to the blade arrangement jig 60, but the blade 62 has a protruding portion 62n that protrudes inward from the positioning portion 62w. The rigidity of the blade 62 is increased as compared with the case where the blade 62 is not used. As a result, for example, the shaking of the blade 62 is suppressed, so that the accuracy in which the slot 14 (stator core 12) is positioned with respect to the positioning portion 62w of the blade 62 is improved. Therefore, the position accuracy of the stator core 12 with respect to the segment coil 40 is also improved. Therefore, as compared with the case where the blade 62 does not have the protruding portion 62n, the occurrence of the insulating paper 30 coming out of the slot 14 due to the contact between the segment coil 40 and the insulating paper 30 is suppressed.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is also applicable to other aspects.

In the above-described embodiment, the rotary electric machine MG for a vehicle is a motor generator which is a drive source for traveling the vehicle, but the present invention is not limited to this aspect. For example, the rotary electric machine MG for a vehicle may be a motor for driving a vehicle having only an electric motor function without having a generator function, or a regenerative generator having only a generator function without having an electric motor function. It may be.

In the above-described embodiment, the stator core 12 is held in a so-called floating state by a holder (not shown) and can be moved in the same horizontal plane by a force received from the outside, but the present invention is not limited to this aspect. For example, the stator core 12 may be moved by an actuator or the like so that the position of the slot 14 corresponds to the position of the blade 62. The positioning portion 62w may be adjusted so that the position of the slot 14 corresponds to the position of the blade 62 when the blade 62 is inserted into the slot 14, regardless of the positioning method. ..

In the above-described embodiment, the eight segment coils 40 finally inserted into one slot 14 are inserted in two steps, four located on the outer peripheral side and four located on the inner peripheral side. However, the present invention is not limited to this. For example, the eight segment coils 40 to be finally inserted may be inserted at the same time at the same time. Specifically, in the segment coil contact step P2, the tip surfaces 42t of the four segment coils 40 located on the outer peripheral side come into contact with the tip surface 62t of the positioning portion 62w of the blade 62, respectively, and are located on the inner peripheral side. The tip surface 42t of each of the segment coils 40 is in contact with the tip surface 62t of the protruding portion 62n of the blade 62, respectively. Then, in the segment coil insertion step P3, the tip surfaces 42t of the four segment coils 40 located on the outer peripheral side and the four segment coils 40 located on the inner peripheral side are in contact with the tip surface 62t of the blade 62, respectively. It is inserted inside the insulating paper 30. As a result, when eight segment coils 40 are inserted into one slot 14 one by one, the insertion of the segment coils 40 into the insulating paper 30 is repeated eight times, whereas eight segments coils 40 are inserted. Since the segment coil 40 is inserted at the same time, the segment coil 40 is inserted into the insulating paper 30 only once.

In the above-described embodiment, the shapes of the plurality of blades 62 are all the same, and the positioning of the slot 14 with respect to the blade arrangement jig 60 is performed by all the blades 62, but the present invention is not limited to this embodiment. For example, the slot 14 may be positioned with respect to the blade arrangement jig 60 by at least three blades 62 among the plurality of blades 62 at equal angular intervals. For example, for positioning, the width of at least three blades 62 in the circumferential direction is set to be as wide as possible, and the width of the other blades 62 in the circumferential direction is narrower than that. May be.

In the above-described embodiment, the surface of the blade 62 facing the segment coil 40 is the tip surface 62t, but the present invention is not limited to this aspect. For example, the surface of the blade 62 facing the segment coil 40 has a step or an inclined surface in the axis C direction, a part of the facing surfaces is the tip surface 62t, and the rest is from the tip surface 62t in the axis C direction. It may be a recessed mode.

It should be noted that the above description is merely an embodiment of the present invention, and the present invention can be carried out in a mode in which various changes and improvements are made based on the knowledge of those skilled in the art within the range not deviating from the gist thereof.

12: Stator core 14: Slot 14b: Groove bottom surface (inner wall surface of slot)
14s: A pair of groove side surfaces (inner wall surface of slot)
30: Insulation paper 40: Segment coil 60: Blade arrangement jig (coil insertion jig)
62: Blade C: Axis Db: Length (length in the longitudinal direction of the blade)
Ds: Length (length in the axial direction of the stator core)
Lb: Length (length in the radial direction of the blade)
Lc: Length (diameter length of segment coil)

Claims (1)

Inserted inside the insulating paper disposed facing the inner wall surface of the slot having a radial depth provided on the inner peripheral surface of the stator core extending cylindrically about the axis, and inside the insulating paper. A coil insertion jig with a blade for inserting a segment coil.
The length of the blade in the longitudinal direction is longer than the length of the stator core in the axial direction.
A coil insertion jig characterized in that the radial length of the blade is longer than the radial length of the segment coil.

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