WO2018100666A1

WO2018100666A1 - Stator for rotary electric machine

Info

Publication number: WO2018100666A1
Application number: PCT/JP2016/085527
Authority: WO
Inventors: 克倫大木
Original assignee: 三菱電機株式会社
Priority date: 2016-11-30
Filing date: 2016-11-30
Publication date: 2018-06-07
Also published as: CN109983655A; JPWO2018100666A1; JP6633227B2

Abstract

The present invention provides a stator which is for a rotary electric machine, and which is capable of effectively impregnating a coil end with a varnish and suppressing leakage of the varnish to the end surface of a core back. This stator for a rotary electric machine is provided with: an insulator that is mounted to each tooth; a coil that is mounted to each of the teeth to which the insulator is mounted; an insulating sheet that is arranged between the coils adjacent to each other in a peripheral direction; and a varnish with which each of the coils is impregnated, wherein the insulator extends radially inward and outward of each of the coil ends of the coils and projects outward in an axial direction from the coil end, the insulating sheet projects outward in the axial direction from each of the coil ends, and both sides in the radial direction and both sides in the peripheral direction of each of the coil ends are surrounded by the insulator and the insulating sheet.

Description

Rotating electric machine stator

The present invention relates to a stator of a rotating electric machine such as a generator or an electric motor, and more particularly to a stator structure in which a stator winding can be effectively impregnated with varnish.

In the stator of a rotating electrical machine, it suppresses the occurrence of insulation failure due to pinholes or scratches on the insulation film of the conductor wire that constitutes the stator winding, and strengthens or fixes the physical support of the stator winding. In order to effectively transmit the heat generated in the child winding to the stator core, a process of impregnating the stator winding with varnish is performed.

In conventional rotating electric machine stators, both ends of the insulating paper protrude from both end faces of the stator core, and further, coil end portions of the stator winding protrude from the insulating paper. Then, while rotating the stator core with its axial direction as the horizontal direction, the varnish was dropped onto the coil end portion and the insulating paper, and the coil was impregnated with the varnish (for example, see Patent Document 1).

However, in recent years, rotating electrical machines are required to have a small size and high output, and the space factor of the stator windings is increasing. With the increase in the space factor of the stator winding, the permeability of the varnish to the stator winding decreases. Therefore, in the varnish impregnation method in which the varnish is dropped on the coil end portion and the insulating paper while rotating the stator core with the axis direction being horizontal, the stator core hangs down vertically below the varnish dropped on the coil end portion and the insulating paper. The amount increases, and not only the coil end portion but also the coil portion inside the slot is insufficiently impregnated with varnish.

Further, there is a varnish impregnation method in which the stator core is vertically dropped in the axial direction and the varnish is dropped onto the coil end portion from vertically above. In this varnish impregnation method, the varnish dropped onto the coil end portion flows into the slot from the coil end portion, and not only the coil end portion but also the coil portion inside the slot can be expected to be impregnated with the varnish.

JP 2003-189523 A

However, in the varnish impregnation method in which the stator core is axially vertical and the varnish is dropped from the vertical direction onto the coil end portion, the varnish dropped on the coil end portion is not only in the slot but also in the stator core. There was a problem of flowing into the end face of the core back part. The end surface of the core back portion serves as a housing fitting surface that is sandwiched by the housing from both sides in the axial direction. And if the varnish which leaked to the housing fitting surface of a core back part hardens | cures, the holding strength of the stator core by a housing will fall. Therefore, a trimming process for removing the cured varnish is required, which causes a reduction in stator productivity.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and is capable of effectively impregnating a coil end portion with a varnish and suppressing the leakage of the varnish to the end surface of the core back. The purpose is to obtain.

The stator of the rotating electrical machine according to the present invention includes a stator core arranged in the circumferential direction in a state where the teeth portions project radially inward from the inner circumferential wall surface of the annular core back, and the teeth described above. An insulator mounted on each of the portions, a coil mounted on each of the teeth portions on which the insulator is mounted, an insulating sheet disposed between the coils adjacent to each other in the circumferential direction, and the coil Varnish impregnated in each. The insulator extends from the radially inner side and the outer side of each coil end portion of the coil and protrudes axially outward from the coil end portion, and the insulating sheet is pivoted from each of the coil end portions. It protrudes outward in the direction, and the both sides in the radial direction and both sides in the circumferential direction of the coil end portion are surrounded by the insulator and the insulating sheet.

According to this invention, both the radial direction side and the circumferential direction both sides of the coil end portion are surrounded by the insulator and the insulating sheet, and the insulator and the insulating sheet protrude outward in the axial direction from the coil end portion. . Therefore, the varnish dripped on the coil end portion with the stator axial direction being vertical remains in the space surrounded by the insulator and the insulating sheet, and leakage to the end surface of the core back is suppressed. Furthermore, since a predetermined amount of varnish is accumulated on the coil end portion, the varnish is effectively impregnated in the coil end portion.

It is sectional drawing which shows the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the iron core unit in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the iron core unit in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view explaining the impregnation method of the varnish in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the insulating sheet applied to the stator of the rotary electric machine which concerns on Embodiment 2 of this invention. It is a perspective view explaining the impregnation method of the varnish in the stator of the rotary electric machine which concerns on Embodiment 2 of this invention. It is sectional drawing explaining the impregnation method of the varnish in the stator of the rotary electric machine which concerns on Embodiment 2 of this invention. It is a perspective view which shows the insulating sheet applied to the stator of the rotary electric machine which concerns on Embodiment 3 of this invention. It is sectional drawing explaining the impregnation method of the varnish in the stator of the rotary electric machine which concerns on Embodiment 3 of this invention. It is a perspective view which shows the insulating sheet applied to the stator of the rotary electric machine which concerns on Embodiment 4 of this invention. It is a perspective view which shows the insulating sheet applied to the stator of the rotary electric machine which concerns on Embodiment 5 of this invention. It is a perspective view which shows the iron core unit in the stator of the rotary electric machine which concerns on Embodiment 6 of this invention. It is a perspective view which shows the insulating sheet applied to the stator of the rotary electric machine which concerns on Embodiment 6 of this invention.

Embodiment 1 FIG.
1 is a cross-sectional view showing a stator of a rotating electrical machine according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing an iron core unit in the stator of the rotating electrical machine according to Embodiment 1 of the present invention, and FIG. FIG. 4 is a cross-sectional view showing an iron core unit in a stator of a rotary electric machine according to Embodiment 1 of the present invention, and FIG. is there.

1 to 3, the stator 100 is configured by arranging 14 iron core units 1 in an annular shape. The iron core unit 1 includes an arc-shaped core back part 2a, and a tooth part 2b protruding radially inward from an inner peripheral wall surface of the core back part 2a, and an iron core block 2 produced by laminating electromagnetic steel sheets, A coil 3 produced by winding a conductor wire around the tooth portion 2b, an insulator 4 for electrical insulation between the iron core block 2 and the coil 3, and an electrical insulation between the coils 3 adjacent in the circumferential direction And an insulating sheet 5.

The insulator 4 is a resin molded body using, for example, polyphenylene sulfide (PPS) resin. The insulator 4 has a length equal to the length of the tooth portion 2b, and has a cylindrical portion 4a whose inner peripheral shape matches a cross-sectional shape of the tooth portion 2b, and an outer end from one end in the length direction of the cylindrical portion 4a. The first flange portion 4b is formed over the entire circumference by projecting toward the outer diameter side from the other end in the length direction of the cylindrical portion 4a. And a fitting groove 4d formed on both side surfaces of the second flange portion 4c, with the groove direction being the length direction of the long side of the rectangular portion of the cylindrical portion 4a.

The insulating sheet 5 is formed, for example, by press-molding a sheet produced by sandwiching a polyimide film between meta-aramid fibers. The insulating sheet 5 is configured in a T-shape including a fitting portion 5a inserted into the fitting groove 4d and a rectangular interphase insulating portion 5b that covers the circumferential side portion of the coil 3.

Next, a method for manufacturing the stator 100 will be described.

First, the insulator 4 is mounted on the iron core block 2 with the second flange portion 4c facing the core back portion 2a so that the tooth portion 2b is accommodated in the cylindrical portion 4a. Next, for example, a coil 3 is mounted on the iron core block 2 by winding a conductor wire, which is coated with enamel resin, around the cylindrical portion 4 a a predetermined number of times. Next, the fitting portion 5a is fitted into the fitting groove 4d, the insulating sheet 5 is attached to the iron core block 2, and the iron core unit 1 is assembled.

In the iron core unit 1 assembled in this way, the cylindrical portion 4a is disposed between the teeth portion 2b and the coil 3, and the second flange portion 4c is disposed between the core back portion 2a and the coil 3. Electrical insulation between the iron core block 2 and the coil 3 is ensured. On both sides in the circumferential direction of the teeth portion 2b, the slot accommodating portion 3a of the coil 3 is disposed in a space formed by the cylindrical portion 4a, the first flange portion 4b, the interphase insulating portion 5b, and the second flange portion 4c. Has been. At both ends in the axial direction of the tooth portion 2b, the coil end portion 3b of the coil 3 is formed by the cylindrical portion 4a, the first flange portion 4b, the interphase insulating portion 5b, and the second flange portion 4c, and the axial direction is an opening. It is arranged in the space to be. At this time, the first flange portion 4 b, the interphase insulating portion 5 b, and the second flange portion 4 c protrude outward in the axial direction with respect to the coil end portion 3 b of the coil 3.

Next, as shown in FIG. 1, 14 core units are formed by fitting the fitting portions 5 a of the insulating sheet 5 into the fitting grooves 4 d of the second flange portion 4 c of the insulator 4 of the adjacent iron core unit 1. 1 are arranged in an annular shape. Next, the 14 core units 1 arranged in an annular shape by abutting the side surfaces of the core back portions 2a of the adjacent iron core units 1 are put into an annular frame (not shown) by press fitting or shrink fitting. The stator 100 before being impregnated with the varnish 7 is assembled by being fitted and held.

Next, as shown in FIG. 4, the varnish 7 is dropped from the dropping nozzle 6 onto the coil end portion 3 b of the coil 3 with the axial direction of the stator 100 being vertical. The varnish 7 dropped on the coil end portion 3b is stored in a space surrounded by the first flange portion 4b, the interphase insulating portion 5b, and the second flange portion 4c, and impregnated in the coil end portion 3b. Further, a part of the varnish 7 is impregnated into the slot accommodating portion 3a while flowing down in the space surrounded by the slot accommodating portion 3a, the first flange portion 4b, the interphase insulating portion 5b, and the second flange portion 4c. And the remainder of the varnish 7 descend | falls along the interphase insulation part 5b, and drips from the interphase insulation part 5b.
Thereafter, the varnish 7 is cured and the stator 100 subjected to insulation treatment is manufactured.

Here, the stator core is configured by abutting the circumferential side surfaces of the core back portion 2a to each other and arranging 14 core blocks 2 in an annular shape. The core back is configured by arranging the core back portions 2a in an annular shape. Further, the stator winding is composed of 14 coils 3.

In the first embodiment, both axial end portions of the first flange portion 4b and the second flange portion 4c of the insulator 4 extend from the radially inner side and the outer side of the coil end portion 3b and extend axially from the coil end portion 3b. It protrudes outward. Further, both end portions in the axial direction of the interphase insulating portion 5b of the insulating sheet 5 protrude outward in the axial direction from the coil end portion 3b. And both the radial direction both sides and the circumferential direction both sides of each coil end part 3b are surrounded by the 1st flange part 4b, the 2nd flange part 4c, and the phase insulation part 5b. Therefore, the varnish 7 dropped onto the coil end portion 3b with the stator 100 being vertical is constituted by the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 5b surrounding the coil end portion 3b. The impregnation of the varnish 7 into the coil end portion 3b is promoted while staying in the space.

Further, both the radial side and the circumferential side of the slot accommodating portion 3a of the coil 3 are surrounded by the cylindrical portion 4a, the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 5b. Therefore, a part of the varnish 7 dropped onto the coil end portion 3b is formed in the slot housing portion 3a in the space surrounded by the slot housing portion 3a, the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 5b. Flows down along. Thereby, the impregnation of the varnish 7 into the slot accommodating portion 3a is promoted.

Thus, since the impregnation of the varnish 7 into the coil 3 is promoted, the rigidity of the coil 3 can be increased and the electrical insulation of the stator 100 can be improved.

On one end side in the axial direction of the stator 100, leakage of the varnish 7 dripped onto the coil end portion 3 to the housing fitting surface of the core back portion 2a is suppressed. Further, on the other end side in the axial direction of the stator 100, leakage of the varnish 7 flowing down along the slot housing portion 3a to the housing fitting surface of the core back portion 2a is suppressed. Therefore, the trimming work for removing the cured varnish is reduced, and the productivity of the stator 100 is increased.
Since the entire coil 3 can be impregnated with the single coil 3 at one dropping point, the number of drops of the varnish 7 and the moving distance of the dropping nozzle 6 are reduced, and the tact time can be shortened.
The amount of varnish 7 dripping from the coil 3 can be reduced, and the amount of varnish 7 used can be reduced.

Embodiment 2. FIG.
5 is a perspective view showing an insulating sheet applied to a stator of a rotating electrical machine according to Embodiment 2 of the present invention, and FIG. 6 is a method for impregnating varnish in the stator of the rotating electrical machine according to Embodiment 2 of the present invention. FIG. 7 is a cross-sectional view for explaining a varnish impregnation method in a stator of a rotary electric machine according to Embodiment 2 of the present invention.

In FIG. 5, the uneven | corrugated | grooved part 5c is formed in the one end side of the length direction of the interphase insulation part 5b of 5 A of insulating sheets. The concave and convex portion 5c is configured such that when the insulating sheet 5A is mounted on the iron core block 2, concave portions and convex portions extending in the radial direction are alternately repeated in the axial direction.
Other configurations are the same as those in the first embodiment.

In the iron core unit 1A according to the second embodiment, both end portions in the axial direction of the first flange portion 4b and the second flange portion 4c of the insulator 4 extend from the radially inner side and the outer side of the coil end portion 3b, and the coil end portion. It protrudes outward in the axial direction from 3b. Further, both end portions in the axial direction of the interphase insulating portion 5b of the insulating sheet 5A protrude outward in the axial direction from the coil end portion 3b. And both the radial direction both sides and the circumferential direction both sides of each coil end part 3b are surrounded by the 1st flange part 4b, the 2nd flange part 4c, and the phase insulation part 5b. Further, the both sides in the radial direction and both sides in the circumferential direction of the slot accommodating portion 3a of the coil 3 are surrounded by the cylindrical portion 4a, the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 5b. Therefore, also in the second embodiment, the same effect as in the first embodiment can be obtained.

According to the second embodiment, as shown in FIG. 7, when the concave and convex portion 5 c is attached to the iron core block 2, the uneven end portion 5 c of the coil end portion 3 b of the coil 3 and the slot storage portion 3 a side It is in contact with the portion 3a. Therefore, as shown in FIGS. 6 and 7, the varnish 7 dropped on the coil end portion 3b is constituted by the first flange portion 4b, the second flange portion 4c and the interphase insulating portion 5b surrounding the coil end portion 3b. The amount of varnish 7 that stays in the space and flows down through the slot storage portion 3a is reduced. Thereby, the impregnation of the varnish 7 into the coil end portion 3b is further promoted.

Embodiment 3 FIG.
8 is a perspective view showing an insulating sheet applied to a stator of a rotating electrical machine according to Embodiment 3 of the present invention, and FIG. 9 is a method for impregnating varnish in the stator of the rotating electrical machine according to Embodiment 3 of the present invention. It is sectional drawing explaining these.

In FIG. 8, the insulating sheet 5 </ b> B includes a hydrophilic treatment portion 8 formed by performing a hydrophilic treatment on one end side in the length direction of the fitting portion 5 a and the interphase insulating portion 5 b.
Other configurations are the same as those in the first embodiment.

In Embodiment 3, both axial end portions of the first flange portion 4b and the second flange portion 4c of the insulator 4 extend from the radially inner side and the outer side of the coil end portion 3b and axially extend from the coil end portion 3b. It protrudes outward. Further, both end portions in the axial direction of the interphase insulating portion 5b of the insulating sheet 5B protrude outward in the axial direction from the coil end portion 3b. And both the radial direction both sides and the circumferential direction both sides of each coil end part 3b are surrounded by the 1st flange part 4b, the 2nd flange part 4c, and the phase insulation part 5b. Further, the both sides in the radial direction and both sides in the circumferential direction of the slot accommodating portion 3a of the coil 3 are surrounded by the cylindrical portion 4a, the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 5b. Therefore, also in Embodiment 3, the same effect as in Embodiment 1 can be obtained.

According to the third embodiment, as shown in FIG. 9, when the insulating sheet 5 </ b> B is attached to the iron core block 2, the hydrophilic treatment portion 8 faces the coil end portion 3 b of the coil 3 in the circumferential direction. Be placed. And the varnish 7 dripped at the coil end part 3b becomes easy to adhere to the hydrophilic treatment part 8. Therefore, the varnish 7 tends to stay in the space formed by the hydrophilic treatment portion 8 of the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 5b surrounding the coil end portion 3b, to the coil end portion 3b. The impregnation of the varnish 7 is further promoted.

In the third embodiment, the hydrophilic treatment portion 8 is provided on one end side in the length direction of the interphase insulating portion 5b. However, the hydrophilic treatment portion 8 may be provided on the entire surface of the interphase insulating portion 5b.
Moreover, in the said Embodiment 3, the hydrophilic treatment part 8 may be given to the one end side of the insulating sheet 5A in Embodiment 2, and the hydrophilic process part 8 may be formed.

Embodiment 4 FIG.
FIG. 10 is a perspective view showing an insulating sheet applied to a stator of a rotating electric machine according to Embodiment 4 of the present invention.

In FIG. 10, the insulating sheet 5 </ b> C includes a water repellent treatment portion 9 formed by performing a water repellent treatment on the other end side in the length direction of the fitting portion 5 a and the interphase insulating portion 5 b.
Other configurations are the same as those in the first embodiment.

In the fourth embodiment, both axial end portions of the first flange portion 4b and the second flange portion 4c of the insulator 4 extend from the radially inner side and the outer side of the coil end portion 3b and extend axially from the coil end portion 3b. It protrudes outward. Further, both end portions in the axial direction of the interphase insulating portion 5b of the insulating sheet 5C protrude outward in the axial direction from the coil end portion 3b. And both the radial direction both sides and the circumferential direction both sides of each coil end part 3b are surrounded by the 1st flange part 4b, the 2nd flange part 4c, and the phase insulation part 5b. Further, the both sides in the radial direction and both sides in the circumferential direction of the slot accommodating portion 3a of the coil 3 are surrounded by the cylindrical portion 4a, the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 5b. Therefore, also in the fourth embodiment, the same effect as in the first embodiment can be obtained.

According to the fourth embodiment, when the insulating sheet 5C is attached to the iron core block 2, the water repellent treatment portion 9 of the fitting portion 5a and the interphase insulating portion 5b project from the iron core block 2 to the other side in the axial direction. Formed in the region. And the varnish 7 becomes difficult to adhere to the water-repellent treatment part 9. Therefore, the varnish 7 that has flowed down through the slot accommodating portion 3a in the space surrounded by the cylindrical portion 4a, the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 5b is quickly removed from the water repellent treatment portion 9. Dripping down. As a result, the amount of unnecessary varnish 7 that remains on the other side in the axial direction of the interphase insulating portion 5b and hardens is reduced, and the removal work of the varnish 7 is reduced.

Since the varnish 7 tends to accumulate at the boundary between the water-repellent treatment portion 9 and the water-repellent untreated portion, it is desired to impregnate by setting the boundary at the portion of the coil 3 where the varnish 7 is to be actively impregnated. The portion of the coil 3 can be effectively impregnated with the varnish 7.
In the fourth embodiment, the water repellent treatment portion 9 may be formed by performing water repellent treatment on the other end side of the insulating sheet 5A in the second embodiment or the insulating sheet 5B in the third embodiment.

Embodiment 5 FIG.
FIG. 11 is a perspective view showing an insulating sheet applied to a stator of a rotary electric machine according to Embodiment 5 of the present invention.

In FIG. 11, in the insulating sheet 5D, the other end in the length direction of the interphase insulating portion 5b gradually protrudes outward in the length direction of the interphase insulating portion 5b from the tip of the interphase insulating portion 5b toward the center portion. The second oblique side portion 10 and the other end in the length direction of the interphase insulating portion 5b gradually protrude outward in the length direction of the interphase insulating portion 5b from the base of the interphase insulating portion 5b toward the center portion. The hypotenuse part 11 and the projection part 12 which protrudes in parallel with the length direction of the interphase insulating part 5b from the intersection of the first hypotenuse part 10 and the second hypotenuse part 11 are provided.
Other configurations are the same as those in the first embodiment.

In the fifth embodiment, both end portions of the first flange portion 4b and the second flange portion 4c of the insulator 4 in the axial direction extend from the radially inner side and the outer side of the coil end portion 3b and extend axially from the coil end portion 3b. It protrudes outward. Further, both end portions in the axial direction of the interphase insulating portion 5b of the insulating sheet 5D protrude outward in the axial direction from the coil end portion 3b. And both the radial direction both sides and the circumferential direction both sides of each coil end part 3b are surrounded by the 1st flange part 4b, the 2nd flange part 4c, and the phase insulation part 5b. Further, the both sides in the radial direction and both sides in the circumferential direction of the slot accommodating portion 3a of the coil 3 are surrounded by the cylindrical portion 4a, the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 5b. Therefore, in the fifth embodiment, the same effect as in the first embodiment can be obtained.

According to the fifth embodiment, the axial direction of the interphase insulating portion 5b passes through the slot housing portion 3a through the space surrounded by the cylindrical portion 4a, the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 5b. The varnish 7 that has flowed down to the other end is guided to the first hypotenuse 10 and the second hypotenuse 11 and collected in the protrusion 12. The varnish 7 collected on the protrusion 12 has a smaller contact area with the insulating sheet 5D and promotes dripping from the tip of the protrusion 12. As a result, the amount of unnecessary varnish 7 that remains on the other side in the axial direction of the interphase insulating portion 5b and hardens is reduced, and the removal work of the varnish 7 is reduced.
Further, when the varnish 7 is residually cured on the protrusion 12, it can be easily removed by cutting the protrusion 12.

In the fifth embodiment, the first oblique side portion 10, the second oblique side portion 11, and the protruding portion 12 are formed at the other end in the length direction of the interphase insulating portion 5b of the insulating sheet 5 of the first embodiment. However, the first oblique side part 10, the second oblique side part 11, and the protrusion part 12 may be formed at the other end in the length direction of the interphase insulating part 5b of the insulating sheets 5A-5C in the second to fourth embodiments.
In Embodiment 5 described above, the varnish 7 is dropped onto the coil end portion 3b and the varnish 7 is impregnated into the coil 3. However, the stator is immersed in a container in which the varnish 7 is stored, and the varnish 7 is coiled. The same effect can be obtained by applying the impregnation method.

Embodiment 6 FIG.
12 is a perspective view showing an iron core unit in a stator of a rotary electric machine according to Embodiment 6 of the present invention, and FIG. 13 shows an insulating sheet applied to the stator of the rotary electric machine according to Embodiment 6 of the present invention. It is a perspective view.

12 and 13, the insulating sheet 5E is bent at a right angle so that the two interphase insulating portions 13 protruding from the fitting portion 5a are bent at right angles to the opposite sides at the root portion and then parallel to each other. At the tip side, the tip is bent at a right angle so that the tip approaches.
The iron core unit 1E uses an insulating sheet 5E instead of the insulating sheet 5.
Other configurations are the same as those in the first embodiment.

In the fifth embodiment, both end portions of the first flange portion 4b and the second flange portion 4c of the insulator 4 in the axial direction extend from the radially inner side and the outer side of the coil end portion 3b and extend axially from the coil end portion 3b. It protrudes outward. Further, both axial end portions of the interphase insulating portion 13 of the insulating sheet 5E protrude outward in the axial direction from the coil end portion 3b. And both the radial direction both sides and the circumferential direction both sides of each coil end part 3b are surrounded by the 1st flange part 4b, the 2nd flange part 4c, and the phase insulation part 13. FIG. Furthermore, both the radial direction both sides and the circumferential direction both sides of the slot accommodating part 3a of the coil 3 are surrounded by the cylinder part 4a, the 1st flange part 4b, the 2nd flange part 4c, and the interphase insulation part 13. FIG. Therefore, in the sixth embodiment, the same effect as in the first embodiment can be obtained.

According to the sixth embodiment, the two interphase insulating portions 13 of the insulating sheet 5E bulge in the circumferential direction and are pressed and sandwiched between the slot accommodating portions 3a of the adjacent coils 3. As a result, the interphase insulating portion 13 has a shape that follows the slot accommodating portion 3a of the coil 3 due to the restoring force, and is partially in contact with the slot accommodating portion 3a. Therefore, the space between the slot accommodating portion 3a and the interphase insulating portion 13 is narrowed. This makes it difficult for the varnish 7 to flow through the space surrounded by the slot accommodating portion 3a, the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 13, and the varnish 7 tends to stay on the coil end portion 3b. . Therefore, the impregnation of the varnish 7 into the coil end portion 3b is further promoted. Furthermore, it becomes easy to stay in the space surrounded by the slot accommodating portion 3a, the first flange portion 4b, the second flange portion 4c, and the interphase insulating portion 13, and the varnish 7 is promoted to impregnate the varnish 7 into the slot accommodating portion 3a. .

In the sixth embodiment, the uneven portion 5 c in the second embodiment may be formed on one end side in the length direction of the interphase insulating portion 13. Further, the hydrophilic treatment portion 8 in the third embodiment may be formed on one end side in the length direction of the interphase insulating portion 13. Further, the water repellent portion 9 in the fourth embodiment may be formed on the other end side in the length direction of the interphase insulating portion 13. Furthermore, the first oblique side portion 10, the second oblique side portion 11, and the projection portion 12 in the fifth embodiment may be formed at the other end in the length direction of the interphase insulating portion 13.
Moreover, in each said embodiment, although the insulator 4 is integrally molded, the insulator may be divided | segmented into plurality, for example, may be divided into 2 in the axial direction of an iron core block.

1,1A, 1E Iron core unit, 2 Iron core block, 2a Core back part, 2b Teeth part, 3 Coil, 3a Slot storage part, 3b Coil end part, 4 Insulator, 5, 5A, 5B, 5C, 5D, 5E Insulation sheet 5c Uneven portion, 7 varnish, 8 hydrophilic treatment portion, 9 water-repellent treatment portion, 10 first oblique side portion, 11 second oblique side portion, 12 projection portion.

Claims

The stator cores arranged in the circumferential direction with the teeth portions protruding radially inward from the inner circumferential wall surface of the annular core back, and
An insulator attached to each of the above-mentioned teeth portions;
A coil attached to each of the teeth portions to which the insulator is attached;
Respectively, an insulating sheet disposed between the coils adjacent in the circumferential direction;
Varnish impregnated in each of the coils,
The insulator extends from the radially inner side and the outer side of each coil end portion of the coil and protrudes axially outward from the coil end portion,
The insulating sheet protrudes outward in the axial direction from each of the coil end portions,
A stator of a rotating electrical machine in which each of both radial sides and circumferential sides of the coil end portion is surrounded by the insulator and the insulating sheet.
The stator for a rotating electric machine according to claim 1, wherein both the radial side and the circumferential side of the slot housing portion of the coil are surrounded by the insulator and the insulating sheet.
The stator for a rotating electric machine according to claim 2, wherein the insulating sheet is in contact with the slot housing portion in at least a part of a region facing the tooth portion.
Concave and convex portions formed by alternately repeating concave portions and convex portions connected in the radial direction in the axial direction are formed on one end side in the axial direction of the insulating sheet,
The stator of the rotating electrical machine according to any one of claims 1 to 3, wherein the insulating sheet is in contact with the coil at the uneven portion.
The stator for a rotating electrical machine according to any one of claims 1 to 4, wherein the hydrophilic treatment portion is formed in a region on one side in the axial direction of the insulating sheet.
The stator for a rotating electrical machine according to any one of claims 1 to 5, wherein the water repellent treatment part is formed in a region on the other axial side of the insulating sheet.
The other end in the axial direction of the insulating sheet is a first oblique side portion that gradually protrudes outward in the radial direction from the radially inner end toward the radially outer side, and gradually from the radially outer end toward the radially inward side. 7. The device according to claim 1, further comprising: a second oblique side projecting outward in the axial direction; and a projection projecting outward in the axial direction from an intersection of the first oblique side and the second oblique side. A stator for a rotating electrical machine according to claim 1.