JP2020028154A - Cooling structure of rotary electric machine - Google Patents

Abstract

To improve cooling efficiency with a simple structure in a rotary electric machine such as a motor generator for performing cooling by internally introducing a cooling liquid such as oil.SOLUTION: A rotary electric machine includes a rotor 18 and a stator 22 in which a plurality of insulators 28 around which a coil 26 is wound are annularly installed at an outer periphery of the rotor 18 with a gap 20 in a radial direction. A flange 30 projecting outward of the insulator 28 is formed on an inner peripheral side of each insulator 28. A cooling liquid is supplied from at least one side in an axial direction of the rotor 18 to the gap 20. A gap 32 (introduction section) for introducing the cooling liquid between insulators 28 (between coils 26) is formed in an edge section 30b where flanges 30 of the insulator 28 are opposed to each other in a circumferential direction of the rotor 18.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotating electric machine such as a motor generator, and more particularly to a cooling structure of a rotating electric machine that performs cooling by introducing a cooling liquid such as oil into the inside.

  2. Description of the Related Art In a rotating electric machine such as a motor generator used as a drive source of a vehicle, a working lubricant (ATF) for an automatic transmission is introduced into a gap between a rotor and a stator inside the rotating electric machine, and the rotation of the rotor is used. There is known a technique for cooling the entire rotating electric machine by cooling. (Patent Document 1)

JP 2009-201217 A

The portion of the rotating electric machine that generates a large amount of heat is a plurality of coils constituting the stator. In order to efficiently cool the rotating electric machine, it is necessary to supply more cooling liquid such as ATF between the plurality of coils. is there.
However, flanges are formed on the surface of each coil facing the rotor (the rotor-side portion of the insulator around which the coil is wound) for the purpose of insulating the coil from the rotor and preventing the coil from falling off. The flanges along the rotation direction of the rotor are arranged very closely so that the interval between them is substantially zero.
For this reason, even if the coolant is introduced into the gap between the rotor and the stator, it is not possible to supply a sufficient coolant between the coils. Further, the supply amount is reduced and the cooling effect cannot be expected. The lower part of the rotating electric machine can be expected to have a certain cooling effect due to the natural fall of the cooling liquid and the residual inside.

  The present invention has been made in view of the above-described problems, and has as its object to provide a cooling structure of a rotating electric machine that can efficiently supply a coolant between a plurality of coils (between insulators). .

  (1) In order to achieve the above object, a cooling structure for a rotating electric machine according to the present invention comprises a rotor and a plurality of insulators each having a coil wound around the outside thereof on the outer periphery of the rotor in a radial direction of the rotor. A stator that is annularly disposed with a gap, a flange is formed on an inner peripheral side of each of the insulators so as to protrude outward of the insulator, and the flange is formed from at least one side in the axial direction of the rotor. In the rotating electric machine in which the cooling liquid is supplied to the gap, an introduction portion for introducing the cooling liquid between the insulators is formed at a portion where the flanges are opposed to each other in a circumferential direction of the rotor.

(2) It is preferable that the introduction section is constituted by a gap formed between the two flanges.
(3) It is preferable that the gap is formed by a predetermined length along the axial direction on the other side in the axial direction opposite to the one side.
(4) The gap is formed so that the width along the circumferential direction is larger on the other side in the axial direction, which is on the opposite side to the one side than on the one side in the axial direction. Is preferred.

(5) Preferably, the gap is formed by chamfering an edge of a surface of the flange located on the near side in the main rotation direction of the rotor facing the rotor.
(6) Preferably, the gap is formed by chamfering an edge of a surface of the flange located on a rear side in the main rotation direction of the rotor on a side opposite to a surface facing the rotor.
(7) Further, it is preferable that the thickness of the flange at the portion where the gap is formed is larger than the thickness of the other portion where the gap is not formed.
(8) It is preferable that the thickened flange is the flange located on the rear side in the main rotation direction of the rotor.
(9) In addition, a surface forming the gap of the flange having the increased thickness, and the gap formed on a surface of the flange located on the near side in the main rotation direction of the rotor facing the rotor. Is preferably substantially parallel to the surface constituting

  According to the present invention, since the coolant introduction portion is formed between the flanges of the insulators arranged closely, it is possible to supply a larger amount of coolant between the insulators (between the coils), The coil, which is the largest heat source in the electric machine, can be efficiently cooled.

  Further, according to the present invention, the introduction portion is constituted by a gap formed between the flanges, and the gap is formed with a predetermined length on the other side opposite to the one side in the axial direction where the coolant is introduced. As it is formed only or its width is increased, the spontaneous fall of the coolant on one side to be introduced is suppressed, and the coolant near the same side is moved upward of the rotating electric machine by rotation of the rotor. It can be scraped up and supplied to the gap between the insulators from above, and the entire rotating electric machine can be cooled.

  Furthermore, since the gap is formed by chamfering the edge of the insulator, the gap can be formed without changing the practical distance between the flanges, and a decrease in the insulating function of the insulator can be suppressed. In addition, the opening area of the gap facing the scattering direction of the coolant raked up by the rotation of the rotor can be increased, and more coolant can be supplied between the coils.

  In addition, since the thickness of the flange at the portion where the gap is formed is made thicker than the thickness of the other portion where the gap is not formed, the insulation distance is increased by that amount, and the rotor of the flange is formed by forming the gap. When the length in the rotation direction is shorter than the other parts, it is possible to suppress a decrease in the insulating function.

FIG. 1 is a partial cross-sectional view illustrating a schematic configuration of a rotating electric machine to which the present invention is applied. FIG. 2 is a partial cross-sectional view taken along the line AA in FIG. 1. It is arrow sectional drawing which follows the BB line of FIG. 2 which shows the structure of 1st Embodiment of this invention. FIG. 4 is a cross-sectional view taken along line CC of FIG. 3 illustrating a configuration of the first embodiment of the present invention and a modified example thereof, wherein FIG. FIG. 7 is a diagram illustrating a first modification of the embodiment, FIG. 7C is a diagram illustrating a second modification of the first embodiment, and FIG. 7D is a diagram illustrating a third modification of the first embodiment. It is sectional drawing similar to FIG. 3 which shows the structure of 2nd embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that the embodiments described below are merely examples, and there is no intention to exclude various modifications and application of technology not explicitly described in the following embodiments.

As shown in FIG. 1, a rotating electric machine 10 such as a motor generator mounted as a drive source of a vehicle is rotatably mounted via a bearing 16 on a case 12 and a cover 14 connected by bolts or the like (not shown). The rotor 18 includes a supported rotor 18 and an annular stator 22 fixed in the case 12 and arranged so as to have a gap 20 in a radial direction of the rotor 18.
The case 12 is provided with a supply hole 24 for introducing a cooling liquid such as ATF, and a guide 12a formed on the inner surface of the case 12 is provided on one side (in the axial direction of the rotation shaft 18a of the rotor 18). The cooling liquid is supplied from the left side (in the figure) to the gap 20.

As shown in FIG. 2, the stator 22 is configured by connecting a plurality of substantially rectangular cylindrical insulators 28 each having a coil 26 wound around the outer circumference thereof in a ring shape along the circumferential direction of the rotor 18. . The insulator 28 is supported by well-known teeth (stator core) not shown.
A flange 30 is provided on the inner peripheral side (the lower side in FIG. 2) of each insulator 28 so as to protrude outwardly (in the rotational direction and the axial direction of the rotor 18) of the insulator 28. Are arranged closely so that the interval between the lateral flange portions 30a formed on the side along the rotation direction of the rotor 18 is substantially zero. (See FIG. 3. FIG. 3 shows a cross section of only the insulator 28, and omits the coil 26, teeth, and the like.)

Then, as shown in FIG. 3, a gap as an introduction part for introducing the coolant between the insulators 28 (also between the coils 26) is provided at the edge 30 b, which is the part of each horizontal flange 30 a facing each other. 32 are formed. The upper side in FIG. 3 is the one side 18b in the axial direction of the rotor 18 to which the coolant is supplied, and each gap 32 is provided on the other side 18c in the axial direction of the rotor 18 opposite to the one side 18b. It is formed over a predetermined length L1 along the axial direction. It is preferable that the predetermined length L1 is about ２〜 to １ ／ of the total length L2 along the axial direction of the flange 30.
As shown in FIGS. 3 and 4A, the gap 32 is formed by a notch 30c in which a part of the edge 30b of the horizontal flange 30a is simply cut out.

  According to the first embodiment of the present invention having the above-described configuration, the gap 32 is formed between the flanges 30 of the insulators 28 connected so as to be in close contact with each other as an introduction portion for introducing the cooling liquid. A large amount of the cooling liquid introduced into the gap 20 can be supplied from the gap 32 to between the insulators 28 (between the coils 26), and the coil 26, which is the largest heat source in the rotary electric machine 10, can be efficiently cooled. .

  Further, since the gap 32 is formed on the other side 18c opposite to the one side 18b in the axial direction to which the coolant is supplied, the coolant drops naturally from the one side 18b to the gap 32 (particularly, , The spontaneous fall in the lower half of the rotating electric machine 10) is suppressed, and a larger amount of coolant is held in the gap 20. Therefore, the held coolant is swept up to an upper portion in the rotating electric machine 10 by the rotation of the rotor 18, and the gap between the insulators 28 (between the coils 26) disposed above the rotating electric machine 10 is removed from the gap 32. A larger amount can be supplied, and the entire rotating electric machine 10 can be cooled more efficiently.

The gap 32 is formed not only in the configuration shown in FIGS. 3 and 4A but also in the main rotation direction R (rotation direction when the vehicle is traveling forward) R as shown in FIG. The edge 30b of the surface (lower side surface) 30ad of the horizontal flange portion 30a facing the rotor 18 (left side in FIG. 4B) may be formed with a chamfered portion 30cc.
According to this shape, the gap 32 can be formed without changing the practical distance between the flanges 30, and a decrease in the insulating function of the insulator 28 can be suppressed. Further, the opening area of the gap 32 facing in the direction in which the coolant scattered by the rotation of the rotor 18 is scattered (direction approximating the tangential direction of the outer surface of the rotor 18) is set to be larger with only the minimum chamfered portion 30cc. And more cooling liquid can be supplied between the coils 26.

  In addition, as shown by a broken line 30cd in FIG. 4B, in addition to the chamfered portion 30cc, the rotor of the horizontal flange portion 30a located on the rear side (the right side in FIG. By chamfering the edge 30b of the surface (upper side surface in FIG. 4B) 30au opposite to the surface facing 18, the flow area of the gap 32 can be reduced while suppressing the deterioration of the insulating function as described above. The cooling liquid can be supplied between the coils 26 in a larger amount.

  Further, in the gap 32 formed by the simple notch 30c shown in FIG. 4A, the distance between the flanges 30 (between the horizontal flange portions 30a) in the portion where the gap 32 is formed may be increased, and the insulation function may be reduced. However, as shown in FIG. 4C, the thickness T1 of the horizontal flange portion 30a in the portion where the gap 32 is formed is changed to the thickness T1 of the horizontal flange portion 30a in the other portion where the gap 32 is not formed. By making the thickness thicker (larger) than T2, the insulation distance can be increased and the deterioration of the insulation function can be suppressed.

  Further, as shown in FIG. 4D, a chamfered portion 30cc similar to that shown in FIG. 4B is formed in the horizontal flange portion 30a located on the near side in the main rotation direction R of the rotor 18 so as to form the same in the main rotation direction R. The notch surface 30cn of the notch 30c provided in the lateral flange portion 30a located on the rear side is formed so as to be substantially parallel to the chamfered portion 30cc, and the thickness of the lateral flange portion 30a in the notch 30c portion is shown in FIG. By making the thickness thicker than the other portions in the same manner as in (c), the opening area of the gap 32 facing in the direction in which the coolant is scattered can be made larger, and the large cutout surface 30cn formed by the thick portion serves as a coolant receiving port. As a result, more coolant can be supplied between the coils 26. Further, a decrease in the insulating function can be sufficiently suppressed, and in the configuration of the four types of gaps 32 shown in FIGS. 4A to 4D, the configuration shown in FIG. It can be called a configuration.

  Next, a second embodiment of the present invention will be described with reference to FIG. However, the same or substantially the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the second embodiment, the width along the circumferential direction (the horizontal direction in FIG. 5) of the gap 40 formed in the edge portion 30b, which is a portion of each horizontal flange portion 30a facing each other, is greater than the axial one side 18b. The other side 18c is configured to be large. The cross-sectional shape of the gap 40 may be any of the configurations shown in FIGS. 4 (a) to 4 (d).
The length of the gap 40 along the axial direction is not limited to the partial length shown in FIG. 5, and may be formed so as to cover substantially the entire length of the flange 30 in the axial direction. According to the configuration of the second embodiment, the width of the gap 40 on the one side 18b to which the coolant is supplied is narrowed, so that the coolant 18 stays in the gap 20 at this one side 18b. It can also encourage some natural fall.
Therefore, the second embodiment can also provide the same operation and effect as the first embodiment.

  In each of the above embodiments, the description has been made on the premise that the gaps 32 and 40 are provided over the entire inner circumference of the stator 22. However, as described in the paragraph 0004, the lower portion of the rotary electric machine 10 has a certain degree of cooling. Since the function can be ensured, the gaps 32 and 40 may be provided only in the upper part of the rotating electric machine 10.

The embodiments of the present invention have been described above, but the present invention can be implemented by appropriately modifying such embodiments.
In each of the above-described embodiments, the example in which the cooling liquid introduction portion is configured by the gaps 32 and 40 has been described. However, the configuration of the introduction portion is not limited to this. For example, in the vicinity of the edge portion 30b of the horizontal flange portion 30a. It may be constituted by a plurality of holes penetrating the thickness of the horizontal flange portion 30a.

DESCRIPTION OF SYMBOLS 10 Rotating electric machine 18 Rotor 20 Air gap 22 Stator 24 Coolant supply hole 26 Coil 28 Insulator 30 Flange 32, 40 Gap (introduction part)

Claims (9)

A rotor, and a stator having a plurality of insulators each having a coil wound on the outside thereof and annularly arranged on the outer periphery of the rotor with an air gap in the radial direction of the rotor, and In a rotating electric machine, a flange is formed on a circumferential side of the insulator so as to protrude outward, and a coolant is supplied to the gap from at least one axial side of the rotor.
A cooling structure for a rotating electric machine, wherein an introduction portion for introducing the cooling liquid between the insulators is formed at a portion where the flanges are opposed to each other in a circumferential direction of the rotor. The cooling structure for a rotating electric machine according to claim 1, wherein the introduction portion is configured by a gap formed between the two flanges. The cooling structure for a rotating electric machine according to claim 2, wherein the gap is formed by a predetermined length along the axial direction on the other side of the axial direction opposite to the one side. . The width of the gap along the circumferential direction is formed such that the other side in the axial direction, which is opposite to the one side in the axial direction, is larger than the one side in the axial direction. The cooling structure for a rotating electric machine according to claim 2, wherein The said gap is formed by chamfering the edge part of the surface which opposes the said rotor of the said flange located in the front side in the main rotation direction of the said rotor, The any one of Claims 2-4 characterized by the above-mentioned. 2. The cooling structure for a rotating electric machine according to claim 1. The said gap is formed by chamfering the edge part of the surface opposite to the surface facing the rotor of the said flange located behind in the said main rotation direction of the said rotor. 6. The cooling structure for a rotating electric machine according to claim 5. The rotation according to any one of claims 2 to 6, wherein a thickness of the flange at a portion where the gap is formed is larger than a thickness of another portion where the gap is not formed. Electric motor cooling structure. The cooling structure for a rotating electric machine according to claim 7, wherein the flange with the increased thickness is the flange located on the rear side in the main rotation direction of the rotor. A surface forming the gap of the flange having the increased thickness, and a surface forming the gap formed on a surface of the flange located on the near side in the main rotation direction of the rotor facing the rotor. Are substantially parallel to each other.

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