JP2019165606A - Stator for rotating electric machine and electric vehicle - Google Patents

Abstract

In a stator for a rotating electric machine, interference between a coil segment and an insulating sheet is prevented while ensuring high reliability. An insulating sheet (30) has a central folded portion (32) bent so as to protrude outward in a widthwise central region before a coil segment is inserted into a slot (12), and a central folded portion (32). And formed on both sides thereof and bent so as to protrude outwardly. Before the coil segment is inserted into the slot 12, the insulating sheet 30 is inserted into the slot 12 and the central folded portion is formed. In a state where the slot 32 is in contact with the slot 12, a part of the insulating sheet 30 projects from the opening 14. [Selection] Figure 2

Description

  The present invention relates to a stator for a rotating electrical machine and an electric vehicle.

  Among the stator cores of rotating electrical machines, what is called an open slot type is formed in a substantially cylindrical shape, and a slot recessed along the radial direction is formed on the inner peripheral surface thereof. In these slots, an insulating sheet bent in a substantially U shape is inserted from the inner peripheral side so as to open toward the center of rotation, and a coil segment that is a covered electric wire having a substantially rectangular cross section is inserted in the slot. The However, if the substantially U-shaped opening of the insulating sheet is narrow, when the coil segment is inserted into the slot, the coil segment and the insulating sheet interfere with each other, and the coil segment coating or insulating sheet may be damaged. There is. As a countermeasure, the insulating sheet described in Patent Document 1 below includes an insertion portion that is inserted into each slot and a connection portion that connects these insertion portions. In this technique, an insertion portion of an insulation sheet is inserted into each slot, a coil segment is inserted into each slot, a connection portion of the insulation sheet is cut, and the cut connection portion is wound around the coil segment and fixed with a varnish. Yes.

Japanese Patent No. 4973420

However, according to the technique described in Patent Document 1, when the connecting portion of the insulating sheet is peeled off, there is a possibility that the peeled connecting portion may interfere with the rotor, and the reliability is lowered.
This invention is made in view of the situation mentioned above, and it aims at providing the stator for rotary electric machines which can prevent interference with a coil segment and an insulating sheet, and an electric vehicle, ensuring high reliability.

  In order to solve the above problems, a stator for a rotating electrical machine according to the present invention includes a stator core that is formed in a substantially cylindrical shape and has a plurality of slots each having an opening that opens toward an inner peripheral surface, and the opening to the slot. A plurality of coil segments to be inserted; and a plurality of insulating sheets that are inserted into the slots from the openings and are disposed between the coil segments and the stator core, wherein the insulating sheet has the coil segments In a state before being inserted into the slot, a center fold portion that is bent so as to protrude outward in the central region in the width direction, and formed on both sides of the center fold portion so as to protrude outward. Both sides of the folded portion, and the insulating sheet is inserted into the slot before the coil segment is inserted into the slot. In a state where Hisashiori portion comes into contact with the slot, wherein a portion of the insulating sheet protrudes from the opening.

  According to the present invention, it is possible to prevent interference between the coil segment and the insulating sheet while ensuring high reliability.

It is a fragmentary perspective view of the stator for rotary electric machines by one Embodiment of this invention. It is sectional drawing of the principal part of one Embodiment. It is other sectional drawing of the principal part of one Embodiment. It is sectional drawing of the principal part in a 1st comparative example. It is sectional drawing of the principal part in a 2nd comparative example.

<Configuration of the embodiment>
FIG. 1 is a partial perspective view in the middle of manufacturing a stator 100 for a rotating electrical machine according to an embodiment of the present invention.
When this stator 100 for a rotating electrical machine is combined with a rotor (not shown), a rotating electrical machine can be configured. The rotating electrical machine is mounted on an electric vehicle (not shown) and drives the electric vehicle. In FIG. 1, a stator 100 for a rotating electrical machine includes a stator core 10, a coil segment 20, and an insulating sheet 30.

  The stator core 10 is a member having a high magnetic permeability formed in a substantially cylindrical shape, and a plurality of slots 12 cut out along the axial direction and the radial direction are provided at equal positions in the circumferential direction of the inner peripheral surface thereof. Is formed. The coil segment 20 is formed by bending a flat wire and is inserted into the slot 12. The insulating sheet 30 is formed by bending an insulating material formed in a sheet shape so as to follow the inner peripheral surface of the slot 12. The insulating sheet 30 is inserted between the coil segment 20 and the stator core 10 to insulate the stator core 10 from the coil segment 20.

  In FIG. 1, only one insulating sheet 30 is illustrated, but the insulating sheet 30 is inserted into all the slots 12. Although only one coil segment 20 is shown, a plurality of coil segments 20 (for example, eight) are inserted into each slot 12. The stator core 10 is called an “open slot type”, and the width of the slot 12 is substantially constant. And the coil segment 20 is inserted in the slot 12 from the inner peripheral side of the stator core 10 along the arrow P1 in the drawing.

2 is a cross-sectional view taken along the line II-II before the coil segment 20 is inserted in FIG.
In FIG. 2, the slot 12 has a substantially rectangular cross-sectional shape and has an opening 14 that opens from the inner peripheral surface 10 a of the stator core 10. The insulating sheet 30 is bent into a substantially U shape and is inserted into the slot 12 through the opening 14. More specifically, the insulating sheet 30 has a total width that is substantially the same as the total inner side length of the slot 12. And the center folding part 32 bent so that it might protrude outside is formed in the width direction center area | region of the insulating sheet 30. As shown in FIG. Further, on both sides of the central folding part 32, both side folding parts 34 that are bent so as to protrude outward are formed. The bending angle of the center folding part 32 and the both side folding parts 34 is an obtuse angle of about 110 ° to 130 °.

  Further, both end portions 36 of the insulating sheet 30 are slightly expanded in the circumferential direction in a state where the central folded portion 32 of the insulating sheet 30 is in contact with the slot 12, and from the opening portion 14 of the slot 12 to the inner peripheral side. It protrudes. As described above, in the state of FIG. 2, since both end portions 36 of the insulating sheet 30 are slightly expanded in the circumferential direction, when the coil segment 20 (see FIG. 1) is inserted into the slot 12, It becomes hard to interfere with the part 36, and damage to the coil segment 20 and the insulating sheet 30 by these interference can be prevented beforehand.

3 is a cross-sectional view taken along the line II-II when the coil segment 20 is inserted into the slot 12 in FIG.
In the present embodiment, eight coil segments 20 are finally inserted into each slot 12. FIG. 3 shows a state in the middle of inserting four of these eight coil segments 20. In FIG. 3, when four coil segments 20 are inserted into the slot 12, the central folding part 32 is pushed and expanded by the rightmost coil segment 20, and the central folding part 32 becomes substantially flat. Further, the bending angle of the side folding portions 34 is about 90 °.

  Further, when the both-side folded portion 34 moves to the corner of the slot 12, both end portions 36 protruding from the opening 14 of the slot 12 are drawn into the inside of the slot 12. Furthermore, the insulating sheet 30 is also pressed by the four coil segments 20 in the circumferential direction (vertical direction in the drawing). As a result, the shape of the insulating sheet 30 is along the slot 12, and both end portions 36 are also in close contact with the slot 12. As a result, even when the remaining four coil segments 20 (not shown) are inserted into the slot 12, the distance between the both end portions 36 can be sufficiently widened, and the coil segment 20 and the insulating sheet 30 interfere with each other. Can be prevented.

<Comparative example>
Next, in order to clarify the effect of the present embodiment, configurations of the first comparative example and the second comparative example will be described.
FIG. 4 is a cross-sectional view corresponding to FIG. 2 in the first comparative example. In the first comparative example, an insulating sheet 40 is applied instead of the insulating sheet 30 of the above embodiment. The insulating sheet 40 is also bent in a substantially U shape. However, the insulating sheet 40 has bent portions 44 of about 90 ° at two locations facing the corners of the slot 12 in a state where the coil segment 20 is not inserted.

  If the bending angle of the bent portion 44 is exactly 90 °, each portion of the insulating sheet 40 is in close contact with the wall surface of the slot 12. However, when the bending angle is slightly smaller than 90 °, the insulating sheet 40 is separated from the wall surface of the slot 12 in the vicinity of both end portions 46 and the opening width of the insulating sheet 40 is narrowed at both end portions 46 as shown in the figure. . If an attempt is made to insert the coil segment 20 into the slot 12 in this state, the coil segment 20 and both end portions 46 of the insulating sheet 40 interfere with each other, and the coil segment 20 or the insulating sheet 40 may be damaged.

  FIG. 5 is a cross-sectional view corresponding to FIG. 2 in the second comparative example. In the second comparative example, an insulating sheet 50 is applied instead of the insulating sheet 30 of the above embodiment. The insulating sheet 50 is also bent in a substantially U shape. However, the insulating sheet 50 has two bent portions 54 at intervals slightly narrower than the corners of the slot 12. The bending angle of the bent portion 54 is slightly larger than 90 °, and both end portions 56 of the insulating sheet 50 protrude inward from the inner peripheral surface 10a of the stator core 10 while slightly expanding in the circumferential direction.

  In the second comparative example, when the coil segment 20 is inserted into the slot 12, the insulating sheet 50 is plastically deformed so as to have the same shape as the insulating sheet 30 (see FIG. 3) of the above embodiment. In the second comparative example, before the coil segment 20 is inserted into the slot 12, both end portions 56 of the insulating sheet 50 are widened. Therefore, as in the above-described embodiment, the coil segment 20 and the insulating sheet 50 are Interference can be prevented. However, in order to plastically deform the insulating sheet 50, it is necessary to press-fit the coil segment 20 into the slot 12 with a strong force, and there is a problem that insertability of the coil segment 20 is deteriorated.

<Effect of the embodiment>
As described above, according to the present embodiment, the insulating sheet (30) is bent so as to protrude outward in the central region in the width direction before the coil segment (20) is inserted. A central folding part (32), and both side folding parts (34) formed on both sides of the central folding part (32) and bent so as to protrude outward, and an insulating sheet (30) is provided in the slot (12). ) Is inserted and before the coil segment (20) is inserted into the slot (12), a part of the insulating sheet (30) protrudes from the opening (14).
Thereby, according to this embodiment, interference with a coil segment (20) and an insulating sheet (30) can be prevented, ensuring high reliability.

Further, according to the present embodiment, the insulating sheet (30) has a total width that is substantially the same as the total inner side length of the slot (12).
Thus, when the coil segment (20) is inserted into the slot (12), the end of the insulating sheet (30) can be positioned near the opening (14) of the slot (12).

<Modification>
The present invention is not limited to the above-described embodiments, and various modifications can be made. The above-described embodiments are illustrated for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, other configurations may be added to the configuration of the above embodiment, and a part of the configuration can be replaced with another configuration.
For example, in the above-described embodiment, the rotating electrical machine stator 100 is applied to an electric vehicle, but the rotating electrical machine stator 100 may be applied to various other electric devices.

DESCRIPTION OF SYMBOLS 10 Stator core 12 Slot 14 Opening part 20 Coil segment 30 Insulation sheet 32 Center folding part 34 Both-sides folding part 100 Stator for rotary electric machines

Claims (3)

A stator core formed in a substantially cylindrical shape and having a plurality of slots having openings that open toward the inner peripheral surface;
A plurality of coil segments inserted into the slot from the opening;
A plurality of insulating sheets inserted into the slot from the opening and disposed between the coil segment and the stator core;
With
The insulating sheet is formed on both sides of the central folded portion and a central folded portion that is bent so as to protrude outward in the central region in the width direction before the coil segment is inserted into the slot. And both side folds bent so as to protrude outward, and
Before the coil segment is inserted into the slot and in a state where the insulating sheet is inserted into the slot and the central folding portion is in contact with the slot, a part of the insulating sheet protrudes from the opening. A stator for a rotating electrical machine. The stator for a rotating electrical machine according to claim 1, wherein the insulating sheet has a total width that is substantially the same as a total inner side length of the slot. An electric vehicle comprising the stator for a rotating electric machine according to claim 1.

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