JP2019080365A - Stator of rotary electric machine - Google Patents

Abstract

To provide a technology which can appropriately cool a stator core while ensuring a cross section of the stator core in a stator of a rotary electric machine.SOLUTION: A stator 10 of a rotary electric machine comprises a stator core body 15, a stator core 11, and a bolt 18 fixing the stator core 11 to a housing 17. A stator core coolant flow path 38 which guides a coolant R from a bolt through-hole 19 to the inside of the stator core 11 or the outer peripheral surface of the stator core 11 is provided on the stator core 11. A bolt coolant flow path 22 which has a first coolant lead-out part 25 supplying the coolant R to the stator core coolant flow path 38 is provided on the bolt 18. The stator core 11 is constructed for steel plates 14 to be laminated via an adhesion layer 40, and the stator core coolant flow path 38 is provided on the adhesion layer 40.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a stator of a rotating electrical machine.

  The stator of the rotating electrical machine is configured by winding a coil around a stator core. The temperature of the stator rises due to heat generation due to copper loss or iron loss when the rotary electric machine operates. Therefore, a cooling method is known in which a cooling pipe is disposed in a hole passing through the stator core and the stator core is cooled (see Patent Document 1). In such a cooling method, even if there is not enough space for arranging the cooling pipe around the stator core, the cooling flow path can be formed.

Unexamined-Japanese-Patent 2004-112967

  However, in the cooling method described in Patent Document 1, a sufficient cooling effect can not be obtained unless the stator core has many holes for passing the cooling pipe. However, if a large number of holes are made, the cross-sectional area of the stator core becomes small, so that the magnetic flux density becomes large, which may increase the loss.

  The present invention is to provide a technique capable of appropriately cooling a stator core in a stator of a rotating electrical machine while securing a cross-sectional area of the stator core.

One aspect of the present invention is
A stator core having an annular stator core body, and a stator core fixing portion provided on an outer peripheral portion of the stator core body and having a bolt through hole formed therein;
A stator of a rotary electric machine comprising: a bolt inserted into the bolt through hole and fixing the stator core to a housing;
The stator core is provided with a stator core refrigerant flow path for guiding the refrigerant from the bolt through holes to the inside of the stator core or the outer peripheral surface of the stator core.
The bolt is provided with a bolt refrigerant flow passage having a refrigerant introduction portion into which the refrigerant is introduced and a first refrigerant lead-out portion for supplying the refrigerant to the stator core refrigerant flow passage,
In the stator core, a plurality of steel plates are laminated via an adhesive layer,
The stator core refrigerant channel is provided in the adhesive layer.

  According to the above aspect, the refrigerant is provided via the bolt refrigerant passage provided inside the bolt inserted into the bolt through hole of the stator core, and the stator core refrigerant passage provided in the adhesive layer for bonding the stacked steel plates. Is supplied to the stator core, so that the stator core can be properly cooled without reducing the cross-sectional area of the stator core. Thereby, iron loss can be appropriately suppressed.

It is a perspective view of a stator of rotation electrical machinery concerning a 1st embodiment of the present invention. It is a principal part disassembled perspective view of the stator of the rotary electric machine shown in FIG. It is sectional drawing of the stator of the rotary electric machine shown in FIG. It is a cross-sectional enlarged view of the stator core to which the steel plate was laminated | stacked and adhere | attached. It is sectional drawing of the stator core in which the stator core refrigerant | coolant flow path was formed of the contact bonding layer. It is sectional drawing which shows the flow of the refrigerant | coolant supplied to the stator core refrigerant | coolant flow path shown in FIG. It is an enlarged view of the range enclosed by circle VII of FIG. It is sectional drawing which shows the stator core refrigerant | coolant flow path of the stator of the rotary electric machine which concerns on 2nd Embodiment of this invention, and the flow of a refrigerant | coolant.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First Embodiment
First, a stator of a rotary electric machine according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 3, the stator 10 of the rotary electric machine includes a stator core 11 and a coil 12 wound around teeth 11 a of the stator core 11. A crossover portion 13 is formed to project the coil 12 from the end face 21 of the stator core 11. The stator core 11 is formed by laminating and bonding a plurality of steel plates 14 such as electromagnetic steel plates, and is provided on an annular stator core main body 15 and the outer peripheral portion of the stator core main body 15 (six in the embodiment shown in the drawing) And a stator core fixing portion 16.

  The stator core fixing portion 16 is formed with a bolt through hole 19 through which the bolt 18 is inserted. The stator core 11 is fixed by a plurality of bolts 18 inserted into the bolt through holes 19 and screwed to the housing 17. The bolt 18 has a bolt head 20 and clamps the stator core 11 between the bolt head 20 and the housing 17 via a collar 27 disposed between the bolt head 20 and the end surface 21 of the stator core fixing portion 16.

  Inside the bolt 18, there is provided a bolt refrigerant flow passage 22 which extends in the axial direction substantially through the axial center. The bolt refrigerant flow passage 22 has a refrigerant introduction portion 23 opened at an end surface opposite to the bolt head 20, a first refrigerant lead-out portion 25 formed in a radial direction and communicated with the bolt refrigerant flow passage 22, and a second refrigerant discharge And 24. That is, the refrigerant introduction unit 23, the first refrigerant lead-out unit 25, and the second refrigerant lead-out unit 24 form a part of the bolt refrigerant flow passage 22.

  A pipe 26 for supplying a refrigerant R such as cooling oil from a refrigerant supply unit (not shown) is connected to the refrigerant introduction unit 23. The first refrigerant lead-out portion 25 opens into the bolt through hole 19, and the second refrigerant lead-out portion 24 opens into the bolt insertion hole 28 of the collar 27 described later.

  As shown in FIG. 4, the stator core 11 is formed by laminating a plurality of steel plates 14 such as electromagnetic steel plates and adhering them with an adhesive layer 40 made of an adhesive provided between the steel plates 14. As shown in FIG. 5, the adhesive layer 40 has a predetermined pattern of an adhesive portion 41 having an adhesive and a non-adhesive portion 42 having no adhesive. The non-bonded portion 42 is formed extending from the bolt through hole 19 to the outer peripheral surface of the stator core 11. A space defined by the non-adhesion portion 42 and the side surface of the pair of adjacent steel plates 14 constitutes a stator core refrigerant flow path 38. As described above, since the stator core refrigerant flow path 38 can be formed only by providing the non-adhesion portion 42 in the adhesive layer 40, the steel plate 14 constituting the stator core 11 can be a highly versatile steel plate and can be manufactured Cost can be reduced.

  In the present embodiment, as shown in FIG. 5, a pair of stator core refrigerant channels 38 provided on both sides across the bolt through hole 19 is an imaginary line L connecting the bolt through hole 19 and the axial center O of the stator 10. Bases 38 a of the respective stator core refrigerant flow paths 38 are formed in mirror symmetry, and communicate with one bolt through hole 19. Further, in each stator core refrigerant flow passage 38, three branch flow passages 38 b are separated from a base portion 38 a communicating with the bolt through hole 19, and are opened in the outer peripheral surface of the stator core 11.

  As shown in FIG. 7, all the slots 11 b are formed on the outer peripheral portion of the slot 11 b as a part of the bonding portion 41 so that the refrigerant R described later does not flow into the slots 11 b of the stator core 11 from the stator core refrigerant flow path 38. An annular adhesive 39 is provided to surround it.

  The adhesive layer 40 may be formed by applying and solidifying an adhesive, except for the region to be the stator core coolant channel 38. As a result, the stator core coolant channel 38 can be easily manufactured by applying the adhesive except for the portion to be the stator core coolant channel 38. In addition, the adhesive layer 40 may be formed by sticking an adhesive sheet in which a region to be the stator core refrigerant flow path 38 is cut out, or after attaching an adhesive sheet having the same shape as the stator core, the stator core refrigerant flow path 38 You may cut out the area which becomes As described above, the stator core refrigerant channel 38 is obtained by using an adhesive sheet in which the portion to be the stator core refrigerant channel 38 is notched in advance, or by cutting out the portion to be the stator core refrigerant channel 38 after bonding the adhesive sheet. Can be easily manufactured.

  Returning to FIG. 2 and FIG. 3, the collar 27 disposed between the bolt head 20 and the end face 21 of the stator core fixing portion 16 is a refrigerant reservoir formed by expanding the axial intermediate portion of the bolt insertion hole 28. 29, a refrigerant discharge portion 30 opening on the outer peripheral surface of the collar 27, and a radial direction hole 31 communicating the refrigerant reservoir portion 29 and the refrigerant discharge portion 30. That is, the refrigerant reservoir portion 29, the radial holes 31, and the refrigerant discharge portion 30 form the color refrigerant flow path 32 and communicate with the second refrigerant lead-out portion 24.

  Further, on the side surface of the collar 27 in contact with the end face 21 of the stator core fixing portion 16, an engaging portion 33 is formed so as to protrude in the axial direction. The engagement portion 33 engages with the engagement groove 34 (see FIG. 2) formed on the end face 21 of the stator core fixing portion 16 so that the refrigerant discharge portion 30 faces the crossover portion 13 of the coil 12. Orientation is positioned.

  As a result, when the stator core 11 and the collar 27 are assembled to the housing 17 with the bolt 18, the engaging portion 33 of the collar 27 and the engaging groove 34 of the stator core fixing portion 16 are engaged to ensure the direction of the refrigerant discharge portion 30 Can be assembled toward the crossover portion 13 of the coil 12, so that incorrect assembly is prevented and the assembly process is simplified. In addition, since the second refrigerant lead-out portion 24 may be communicated with the refrigerant reservoir portion 29 of the collar 27, there is no need to limit the phase of the bolt 18, and furthermore, the allowable range of the axial position is large. The amount of tightening can be set appropriately without regard to the position of the portion 24.

  In the stator 10 of the rotary electric machine configured as described above, the refrigerant R supplied from the refrigerant supply unit (not shown) is, as indicated by arrows in FIGS. 3 and 6, the pipe 26, the refrigerant introduction unit 23, the bolt refrigerant flow It is supplied to the stator core refrigerant flow passage 38 through the passage 22, the first refrigerant lead-out portion 25 and the bolt through hole 19 and flows inside the stator core 11 (between the steel plates 14) to cool the stator core 11 from the inside. It is supplied to the outer peripheral surface of the stator core 11 from 38 b and flows along the outer peripheral surface. Thereby, the stator core 11 is effectively cooled simultaneously from the inner and outer peripheral surfaces. As described above, since the stator core refrigerant flow path 38 is provided in the adhesive layer 40, the bolt refrigerant flow path 22 provided inside the bolt 18 inserted into the bolt through hole 19 of the stator core 11 and the stacked steel plates Since the refrigerant R is supplied to the stator core 11 through the stator core refrigerant flow path 38 provided in the adhesive layer 40 for bonding 14, the stator core 11 is appropriately cooled without reducing the cross sectional area of the stator core 11. Iron loss can be suppressed. Moreover, there is no increase in magnetic flux density, and torque characteristics are maintained.

  Furthermore, as shown by an arrow in FIG. 3, a part of the refrigerant R supplied to the bolt refrigerant flow passage 22 passes from the refrigerant discharge unit 30 to the coil 12 through the second refrigerant lead-out portion 24 and the color refrigerant flow passage 32. The coil 12 is discharged toward the transition portion 13 to effectively cool the coil 12. As described above, by supplying the refrigerant R to the transfer portion 13 of the coil 12 via the second refrigerant lead-out portion 24, the coil 12 can be appropriately cooled, and copper loss can be suppressed.

Second Embodiment
Subsequently, a stator 10 of a rotary electric machine according to a second embodiment of the present invention will be described with reference to FIG. In addition, the stator 10 of the rotary electric machine of 2nd Embodiment differs from the stator 10 of the rotary electric machine of 1st Embodiment in the shape of a stator core refrigerant | coolant flow path. The other components are the same as those of the first embodiment, and the same reference numerals as in the stator of the rotary electric machine of the first embodiment denote the same constituent elements. Therefore, the same or equivalent parts as those of the stator 10 of the rotary electric machine of the first embodiment are denoted by the same reference numerals or corresponding reference numerals, and the description will be simplified or omitted.

  Generally, in a stator of a rotating electrical machine adopting a cooling method of supplying a refrigerant from above, the amount of heat generation at the lower portion of the stator core tends to be locally high. Therefore, in the second embodiment, as shown in FIG. 8, the sum of the areas of the stator core refrigerant flow paths 38 located in the lower part of the stator core 11 is from the sum of the areas of the stator core refrigerant flow paths 38 located in the upper part of the stator core 11 Is also formed large. The lower portion of the stator core 11 is a region below the horizontal line passing through the axial center O of the stator core when the stator core is viewed in the axial direction, and the upper portion of the stator core 11 is the shaft of the stator core when the stator core is viewed in the axial direction It is an area above the horizontal line passing through the heart O.

  Specifically, the stator core refrigerant of the first embodiment is applied to two bolt through holes 19A located at the upper portion among the plurality of (6 in the embodiment shown in FIG. 8) bolt through holes 19 circumferentially provided. One stator core refrigerant flow passage 38A having the same shape as the flow passage 38 is in communication.

  Further, one common stator core refrigerant flow path 38B is formed in communication with each other between the bolt through hole 19B located in the middle and the bolt through hole 19C located in the lower part adjacent to the bolt through hole 19B. That is, the refrigerant R is simultaneously supplied to the stator core refrigerant flow passage 38B from the two bolt through holes 19B and 19C.

  Furthermore, one common stator core refrigerant flow path 38C is formed in communication with each other between the two adjacent bolt through holes 19C located in the lower part. In the stator core refrigerant flow path 38C, seven branch flow paths 38b are provided so as to open at the outer peripheral surface of the stator core 11. The refrigerant R is simultaneously supplied to the stator core refrigerant passage 38C from the two bolt through holes 19C and 19C.

  The amount of heat absorbed by the refrigerant flowing through the stator core refrigerant passage depends on the surface area of the stator core refrigerant passage, the flow rate of the refrigerant, and the temperature difference between the refrigerant and the stator core. The temperature of the stator core can be made uniform by increasing the flow rate and increasing the area of the stator core refrigerant flow path to absorb more heat from the heat generating portion.

The present invention is not limited to the above-described embodiments, and appropriate modifications, improvements, and the like can be made.
For example, the number and the shape of the stator core refrigerant flow paths 38, 38A, 38B, 38C can be set as appropriate. Further, the stator core refrigerant channels 38, 38A, 38B, 38C do not have to be provided in all the adhesive layers, and can be appropriately set according to the cooling performance.

  Further, in the embodiment described above, the case of cooling the bridging portion 13 projecting from the end face 21 of the stator core 11 has been described, but in order to cool the bridging portion 13 projecting from the end face 51 opposite to the end face 21 of the stator core 11 Alternatively, another coolant lead-out portion may be provided in communication with the bolt coolant passage 22 and a through hole may be provided in the casing 17 in communication with the coolant lead-out portion. Thus, the refrigerant R supplied from the refrigerant supply unit (not shown) is an end surface of the stator core 11 on the opposite side to the end surface 21 of the stator core 11 through the pipe 26, the refrigerant introduction unit 23, the refrigerant lead-out unit, and the through holes of the casing 17. It is discharged toward the transition part 13 of the coil 12 which protrudes from 51. Therefore, the bridging portion 13 protruding from the end surface 51 opposite to the end surface 21 of the stator core 11 is also cooled.

[Summary]
The following aspects are extracted from the above embodiment. In addition, although the corresponding element in the above-mentioned embodiment is shown in parenthesis, it is not limited to this.

(1) An annular stator core body (stator core body 15), and a stator core fixing portion (stator core fixing portion 16) provided on an outer peripheral portion of the stator core body and having a bolt through hole (bolt through hole 19) A stator core (stator core 11) having
And a bolt (bolt 18) for inserting the bolt through hole and fixing the stator core to the housing (housing 17).
The stator core is provided with a stator core refrigerant flow path (stator core refrigerant flow path 38) for guiding the refrigerant (refrigerant R) from the bolt through hole to the inside of the stator core or the outer peripheral surface of the stator core.
A bolt refrigerant flow path having a refrigerant introduction portion (a refrigerant introduction portion 23) into which the refrigerant is introduced and a first refrigerant lead-out portion (first refrigerant lead-out portion 25) for supplying the refrigerant to the stator core refrigerant flow path (Volt refrigerant flow path 22) is provided,
In the stator core, a plurality of steel plates (steel plates 14) are stacked via an adhesive layer (adhesive layer 40),
The stator of a rotating electrical machine, wherein the stator core refrigerant flow path is provided in the adhesive layer.

  According to (1), through the bolt coolant passage provided inside the bolt inserted into the bolt through hole of the stator core and the stator core coolant passage provided in the adhesive layer for bonding the stacked steel plates Since the refrigerant is supplied to the stator core, the stator core can be properly cooled without reducing the cross-sectional area of the stator core. Thereby, iron loss can be appropriately suppressed.

(2) In the stator of the rotating electrical machine according to (1),
The adhesion layer is provided with a non-adhesion portion (non-adhesion portion 42) extending from the bolt coolant channel to the outer peripheral surface of the stator core,
The stator core refrigerant flow path is configured by the non-adhesive portion.

  According to (2), the stator core refrigerant flow channel can be formed simply by providing the non-adhesion portion extending from the bolt refrigerant flow channel to the outer peripheral surface of the stator core in the adhesive layer bonding the stacked steel plates. Thereby, the steel plate which comprises a stator core can use a highly versatile thing, and can hold down manufacturing cost.

(3) In the stator of the rotating electrical machine according to (1) or (2),
The adhesive layer is formed by solidifying a liquid adhesive (adhesive).

  According to (3), the stator core refrigerant flow path can be easily manufactured by applying the adhesive except for the portion to be the stator core refrigerant flow path.

(4) In the stator of the rotating electrical machine according to (1) or (2),
The adhesive layer is composed of an adhesive sheet (adhesive sheet).

  According to (4), the stator core refrigerant flow channel can be obtained by using an adhesive sheet in which a portion to be a stator core refrigerant flow channel is cut in advance or by cutting out a portion to be a stator core refrigerant flow channel after bonding the adhesive sheet. Can be easily manufactured.

(5) In the stator of the rotating electrical machine according to any one of (1) to (4),
When the stator core is viewed in the axial direction, the sum of the areas of the stator core refrigerant flow passages located in the lower part is larger than the sum of the areas of the stator core refrigerant flow passages located in the upper part.

  According to (5), it is possible to make the temperature of the stator core uniform by enlarging the area of the stator core refrigerant flow passage in the lower part where the temperature is locally increased because the refrigerant is hard to be supplied.

(6) In the stator of the rotating electrical machine according to any one of (1) to (5),
A plurality of the bolt through holes are provided in the circumferential direction,
The stator core refrigerant flow path is provided across the adjacent bolt through holes.

  According to (6), by providing the stator core refrigerant flow path over the adjacent bolt through holes, the flow rate of the refrigerant flowing through the stator core refrigerant flow path is increased, so the temperature of the stator core can be made more uniform.

(7) In the stator of the rotating electrical machine according to any one of (1) to (6),
It has a coil (coil 12) attached to the stator core and arranged such that the crossover part (crossover part 13) protrudes from the end face (end face 21) of the stator core,
The bolt refrigerant flow path further includes a second refrigerant lead-out portion (second refrigerant lead-out portion 24) for supplying the refrigerant to the transfer portion.

  According to (7), the coil can be appropriately cooled and the copper loss can be suppressed by supplying the refrigerant to the transition portion of the coil via the second refrigerant lead-out portion.

(8) In the stator of the rotating electrical machine according to (7),
It further comprises a collar (collar 27) disposed between the bolt head of the bolt (bolt head 20) and the end face of the stator core and in which a bolt insertion hole (bolt insertion hole 28) is formed.
In the color, a refrigerant discharge part (refrigerant discharge part 30) disposed to face the crossover part, and a color refrigerant flow path (the refrigerant discharge part connecting the second refrigerant lead-out part of the bolt and the refrigerant discharge part) And a color refrigerant channel 32).

  According to (8), the refrigerant can be reliably supplied to the transfer portion by causing the color refrigerant discharge portion to face the transfer portion of the coil. In addition, the amount of tightening can be set appropriately without regard to the position of the second refrigerant lead-out portion of the bolt.

(9) In the stator of the rotating electrical machine according to (8),
The collar is provided with an engaging portion (engaging portion 33) engaged with the end surface of the stator core.

  According to (9), by appropriately positioning the collar, the refrigerant discharge portion of the collar can be easily made to face the transition portion of the coil.

DESCRIPTION OF SYMBOLS 10 Stator 11 of rotating electric machine Stator core 12 Coil 13 Crossing part 14 Steel plate 15 Stator core main body 16 Stator core fixing part 17 Body 18 Bolt 19, 19A, 19B, 19C Bolt through hole 20 Bolt head 21 End face 22 bolt refrigerant flow path 23 Introduction part 24 Second refrigerant lead-out part 25 first refrigerant lead-out part 27 collar 28 bolt insertion hole 30 refrigerant discharge part 32 color refrigerant flow path 33 engagement parts 38, 38A, 38B, 38C stator core refrigerant flow path 40 adhesion layer 42 non-adhesion part R refrigerant

Claims (9)

A stator core having an annular stator core body, and a stator core fixing portion provided on an outer peripheral portion of the stator core body and having a bolt through hole formed therein;
A stator of a rotary electric machine comprising: a bolt inserted into the bolt through hole and fixing the stator core to a housing;
The stator core is provided with a stator core refrigerant flow path for guiding the refrigerant from the bolt through holes to the inside of the stator core or the outer peripheral surface of the stator core.
The bolt is provided with a bolt refrigerant flow passage having a refrigerant introduction portion into which the refrigerant is introduced and a first refrigerant lead-out portion for supplying the refrigerant to the stator core refrigerant flow passage,
In the stator core, a plurality of steel plates are laminated via an adhesive layer,
The stator of a rotating electrical machine, wherein the stator core refrigerant flow path is provided in the adhesive layer. It is a stator of the rotary electric machine of Claim 1, Comprising:
The adhesion layer is provided with a non-adhesion portion extending from the bolt refrigerant flow path to the outer peripheral surface of the stator core,
The stator of a rotating electrical machine, wherein the stator core refrigerant flow path is configured by the non-adhesive portion. It is a stator of the rotary electric machine of Claim 1 or 2, Comprising:
The adhesive layer is formed by solidifying a liquid adhesive. It is a stator of the rotary electric machine of Claim 1 or 2, Comprising:
The adhesive layer is made of an adhesive sheet, the stator of a rotating electrical machine. It is a stator of the rotary electric machine of any one of Claims 1-4, Comprising:
A stator of a rotating electrical machine, wherein the sum of the areas of the stator core refrigerant channels located in the lower part when the stator core is viewed from the axial direction is larger than the sum of the areas of the stator core refrigerant channels located in the upper part. It is a stator of the rotary electric machine of any one of Claims 1-5, Comprising:
A plurality of the bolt through holes are provided in the circumferential direction,
The stator of a rotary electric machine, wherein the stator core refrigerant flow path is provided across the adjacent bolt through holes. It is a stator of the rotary electric machine of any one of Claims 1-6, Comprising:
And a coil attached to the stator core and disposed such that the transition portion protrudes from the end face of the stator core,
The stator of a rotating electrical machine, wherein the bolt refrigerant flow path further includes a second refrigerant lead-out portion that supplies the refrigerant to the transition portion. It is a stator of the rotary electric machine of Claim 7, Comprising:
It further comprises a collar disposed between the bolt head of the bolt and the end face of the stator core and having a bolt insertion hole formed therein,
A rotary electric machine, comprising: a refrigerant discharge portion arranged to face the crossover portion; and a color refrigerant flow passage communicating the second refrigerant lead-out portion of the bolt with the refrigerant discharge portion. Stator. It is a stator of the rotary electric machine of Claim 8, Comprising:
A stator of a rotating electrical machine, wherein the collar is provided with an engaging portion that engages with the end face of the stator core.

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