JP2017192201A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine which achieves improvement of cooling performance.SOLUTION: A stator 3 of a rotary electric machine includes: a stator core 21 having slots 43; and coil bars 31, each of which is disposed in the slot 43 as a segmented part of a coil 22. A refrigerant passage 56 arranged along a longitudinal direction of the coil bar 31 is provided in the slot 43.SELECTED DRAWING: Figure 6

Description

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

  Conventionally, various cooling structures such as air cooling, oil cooling, and water cooling have been proposed as a structure for cooling a stator of a rotating electrical machine. For example, a structure has been proposed in which a water-cooled cooling plate is brought into contact with a transition portion of a coil disposed outside the stator core (see, for example, Patent Document 1). Similarly, a structure has been proposed in which a coil end portion arranged outside the stator core is cooled by a coolant (see, for example, Patent Document 2).

JP 2013-27173 A JP 2010-166710 A

  By the way, in recent years, further increase in output of rotating electric machines is expected. At this time, a larger amount of current flows in the rotating electrical machine, and the central portion of the coil portion (hereinafter referred to as an in-slot coil portion) located in the slot of the stator core becomes the highest temperature because it is difficult to cool from the surface. . Further, depending on the degree of temperature rise in the central portion of the coil portion in the slot, the increase in the output of the rotating electrical machine may be limited. For this reason, it is desirable to further improve the cooling performance of the coil portion in the slot.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a stator for a rotating electrical machine capable of improving the cooling performance.

  To achieve the above object, according to the first aspect of the present invention, the stator of the rotating electrical machine (for example, the stator 3 in the embodiment) has a stator core (for example, an implementation) having a slot (for example, the slot 43 in the embodiment). Stator core 21) in the form, and a coil part (for example, coil bar 31 in the embodiment) disposed in the slot as a part of a segmented coil (for example, the coil 22 in the embodiment), the coil part A refrigerant passage (for example, the refrigerant passage 56 in the embodiment) is provided in the slot along the longitudinal direction.

  According to a second aspect of the present invention, the stator core has a slot wall portion facing the slot (for example, the slot wall portion 45 in the embodiment), and the refrigerant passages are respectively disposed in the slots. Part (for example, outer diameter side coil bar 31A in the embodiment) and another coil part (for example, inner diameter side coil bar 31B in the embodiment), or between the coil part and the slot wall part, It is a through passage that penetrates the stator core.

  The invention described in claim 3 is characterized in that the refrigerant passage is formed by an insulating member (for example, the insulating member 50 in the embodiment) disposed in the slot.

  The invention described in claim 4 is characterized in that the refrigerant passage has a cross-sectional area that increases as it proceeds from one to the other in the longitudinal direction of the coil portion.

  In the invention described in claim 5, the refrigerant passage and another refrigerant passage (for example, the refrigerant passage 56 in the embodiment) positioned next to the refrigerant passage in the circumferential direction of the stator core are in the axial direction of the stator core. The refrigerant flow directions are opposite to each other.

  In the invention described in claim 6, the refrigerant passage has a refrigerant receiving portion (for example, the refrigerant receiving portion 57 in the embodiment) into which the refrigerant is introduced at least partially located outside the stator core. Features.

  The invention described in claim 7 is characterized in that the refrigerant passage is formed by a wick for guiding the refrigerant by a capillary phenomenon (for example, wick 85 in the embodiment).

  According to the first aspect of the present invention, by supplying the coolant to the coolant passage provided in the slot along the longitudinal direction of the coil portion, the center of the coil portion in the slot that is likely to become the highest temperature in the coil. The portion can be efficiently cooled. Thereby, the cooling performance of the stator can be improved. As a result, it is possible to provide a rotating electrical machine that enables higher output.

  According to the second aspect of the present invention, the refrigerant passage is provided between the plurality of coil portions or between the coil portion and the slot wall portion, and is a through passage that penetrates the stator core. The refrigerant can reach near the center of the coil portion in the slot. Thereby, the center part of the coil part in a slot can be cooled more efficiently. Further, if the refrigerant passage passes through the stator core, the refrigerant supplied to the refrigerant passage from one surface side of the stator core passes through the interior of the stator core and is discharged from the other surface side of the stator core. The ease of flow can be increased. If the easiness of the flow of the refrigerant can be increased, the refrigerant having a low temperature can be supplied near the central portion of the coil portion in the slot, so that the central portion of the coil portion in the slot can be further efficiently cooled. .

  According to the invention described in claim 3, since the refrigerant passage is formed by the insulating structural material disposed in the slot, the position and shape of the refrigerant passage are likely to be stable. Further, by combining and integrating the insulating function and the cooling function, space saving and cost reduction can be achieved.

  According to the fourth aspect of the present invention, since the cross-sectional area of the refrigerant passage becomes wider from one side to the other side in the longitudinal direction of the coil portion, it is possible to improve the discharge performance of the refrigerant supplied to the refrigerant passage. . If the dischargeability of the refrigerant can be improved, it becomes easier to supply the refrigerant having a low temperature near the center portion of the in-slot coil portion, so that the center portion of the in-slot coil portion can be further efficiently cooled. Further, when the inclined surface formed in the refrigerant passage also serves as the draft angle of the mold core, the productivity of the insulating member forming the refrigerant passage can be improved.

  According to the fifth aspect of the present invention, the flow directions of the refrigerant in the two refrigerant passages adjacent to each other in the circumferential direction of the stator core are opposite to each other, so that the thermal unevenness of the stator core and the coil portion in the axial direction of the stator core is reduced. be able to. Thereby, the coil part in a slot can be cooled more efficiently.

  According to the invention described in claim 6, since the refrigerant passage has the refrigerant receiving portion that is located outside the stator core and into which the refrigerant is introduced, the amount of the refrigerant flowing into the refrigerant passage can be increased. Thereby, the center part of the coil part in a slot can be cooled more efficiently.

  According to the seventh aspect of the present invention, since the refrigerant passage is formed by the wick that guides the refrigerant by capillary action, the refrigerant passage can be formed even when it is difficult to provide the refrigerant passage by the space. In addition, when used for a vehicle drive motor, even when the refrigerant supply is biased when the vehicle is traveling on a slope or turning, a refrigerant passage is formed by the end of the wick contacting the refrigerant, Coolability is ensured. As a result, the central portion of the coil portion in the slot can be efficiently cooled.

It is sectional drawing which shows the whole structure of the rotary electric machine of 1st Embodiment. 1 is a partially exploded perspective view of a stator according to a first embodiment. FIG. 3 is a partially exploded perspective view showing the stator core assembly of the first embodiment. 1 is a partially exploded perspective view showing a base plate assembly of a first embodiment. It is a figure which shows the coil bar unit of 1st Embodiment. It is sectional drawing which shows the stator of 1st Embodiment. It is sectional drawing which shows the mode at the time of manufacture of the coil bar unit of 1st Embodiment. It is a perspective view showing a plurality of coil bar units of a 1st embodiment. It is a figure which shows two types of coil bar units of 1st Embodiment. It is a front view which shows the coil bar unit of 2nd Embodiment. It is sectional drawing which follows the F11-F11 line | wire of the coil bar unit shown in FIG. It is sectional drawing which shows the coil bar unit of 3rd Embodiment. It is sectional drawing which shows the modification of the stator of embodiment. It is sectional drawing which shows another modification of the stator of embodiment.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description, components having substantially the same or similar functions are denoted by the same reference numerals. And those overlapping descriptions may be omitted.

(First embodiment)
First, the stator 3 according to the first embodiment will be described with reference to FIGS. 1 to 9.
FIG. 1 is a cross-sectional view showing an overall configuration of a rotating electrical machine 1 including a stator 3 of the present embodiment.
The rotating electrical machine 1 is a traveling motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. However, the configuration of the present embodiment is not limited to the above example, and can be applied to a power generation motor, a motor for other purposes, or a rotating electrical machine (including a generator) other than a vehicle. Although the rotary electric machine 1 of this embodiment is a distributed winding motor, for example, it is not restricted to this, A concentrated winding motor may be sufficient.

As shown in FIG. 1, the rotating electrical machine 1 includes a case 2, a stator 3, a rotor 4, and an output shaft 5.
The case 2 is formed in a cylindrical shape that houses the stator 3 and the rotor 4, for example.
The stator 3 is formed in an annular shape and attached to, for example, the inner peripheral surface of the case 2. The stator 3 includes a stator core 21 described later and a coil 22 attached to the stator core 21, and causes a rotating magnetic field to act on the rotor 4.
The rotor 4 includes, for example, a rotor core and a magnet attached to the rotor core, and is driven to rotate inside the stator 3.
The output shaft 5 is connected to the rotor 4 and outputs the rotation of the rotor 4 as a driving force.

  Here, the axial direction Z, the radial direction R, and the circumferential direction θ (see FIG. 2) of the stator core 21 are defined. The axial direction Z of the stator core 21 is a direction extending substantially parallel to the rotation center axis C of the output shaft 5. The radial direction R of the stator core 21 is a direction radially away from the rotation center axis C and the opposite direction (direction approaching the rotation center axis C). The circumferential direction θ of the stator core 21 is a direction that rotates around the rotation center axis C while maintaining a certain distance from the rotation center axis C.

Next, the structure of the stator 3 of this embodiment is demonstrated.
FIG. 2 is a partially exploded perspective view of the stator 3.
As shown in FIG. 2, the stator 3 of the present embodiment includes a stator core assembly 11 and a pair of base plate assemblies 12A and 12B. The stator 3 of the present embodiment is formed by connecting the stator core assembly 11 and the pair of base plate assemblies 12A and 12B to each other after being individually assembled.

  For example, the coil 22 of the stator 3 of this embodiment is a segmented multi-phase coil, and includes a plurality of coil bars 31 included in the stator core assembly 11 and a plurality of connector coils 32 included in the base plate assemblies 12A and 12B. It is divided into and. The coil 22 is formed by connecting a plurality of coil bars 31 of the stator core assembly 11 and a plurality of connector coils 32 of the base plate assemblies 12A and 12B to each other. The term “segmentation” as used in the present application means that the coil 22 is formed by being divided into a plurality of members and the plurality of members are connected to each other. That is, “segmentation” includes not only the case where the coil 22 is divided into the coil bar 31 and the connector coil 32 but also the case where a plurality of coil portions arranged in different slots 43 are divided from each other. In the present application, a segmented element is referred to as a “coil part”, and an assembly of coil parts is referred to as a “coil”.

Hereinafter, the stator core assembly 11 and the base plate assemblies 12A and 12B of this embodiment will be described in detail.
First, the stator core assembly 11 will be described.
FIG. 3 is a partially exploded perspective view showing the stator core assembly 11.
As shown in FIG. 3, the stator core assembly 11 includes a stator core 21 and a plurality of coil bar units 35 each including two coil bars 31.

  The stator core 21 is formed in an annular shape surrounding the rotor 4. The stator core 21 may be formed, for example, by laminating a plurality of electromagnetic steel plates in the axial direction Z, or may be formed by connecting a plurality of pieces divided in the circumferential direction θ. . The stator core 21 has an annular yoke portion 41, a plurality of teeth portions 42, and a plurality of slots 43. The plurality of tooth portions 42 protrude from the yoke portion 41 toward the inside in the radial direction R of the stator core 21. Each slot 43 is formed between two teeth portions 42 adjacent to each other in the circumferential direction θ of the stator core 21. Each slot 43 penetrates the stator core 21 in the axial direction Z of the stator core 21. Each of the yoke part 41 and the tooth part 42 has a slot wall part 45 facing the slot 43. That is, the slot wall 45 is a wall exposed in the slot 43.

  Each of the plurality of coil bars 31 is linearly formed as a part of the segmented coil 22 and arranged in the slot 43. The plurality of coil bars 31 are formed of a conductive material such as copper. Each of the plurality of coil bars 31 is an example of a “coil part”, a “first coil part”, and an “in-slot coil part”. The plurality of coil bars 31 include a plurality of outer diameter side coil bars (first coil bars) 31A and a plurality of inner diameter side coil bars (second coil bars) 31B. The plurality of outer diameter side coil bars 31A are arranged side by side in the circumferential direction θ. The plurality of inner diameter side coil bars 31B are positioned on the inner peripheral side of the plurality of outer diameter side coil bars 31A and arranged side by side in the circumferential direction θ. In other words, the outer diameter side coil bar 31A and the inner diameter side coil bar 31B are arranged in the radial direction R.

  As shown in FIG. 3, the outer diameter side coil bar 31A and the inner diameter side coil bar 31B have, for example, substantially the same shape and substantially the same length. The outer diameter side coil bar 31A and the inner diameter side coil bar 31B are shifted from each other in the axial direction Z by the thickness of a connector coil 32 to be described later. The outer diameter side coil bar 31 </ b> A and the inner diameter side coil bar 31 </ b> B penetrate the stator core 21 in the axial direction Z, respectively. Further, a small diameter portion (connecting portion) 31e having a length substantially equal to the thickness of the connector coil 32 is provided at both ends of the outer diameter side coil bar 31A and the inner diameter side coil bar 31B. In the present embodiment, the outer diameter side coil bar 31 </ b> A and the inner diameter side coil bar 31 </ b> B are each formed in a prismatic shape along the axial direction Z.

  In the present embodiment, the coil bar unit 35 is formed by holding one outer diameter side coil bar 31 </ b> A and one inner diameter side coil bar 31 </ b> B together by the insulating member 50. That is, the coil bar unit 35 referred to in the present embodiment includes one outer diameter side coil bar 31 </ b> A, one inner diameter side coil bar 31 </ b> B, and the insulating member 50. The insulating member 50 is made of, for example, an insulating synthetic resin. In the present embodiment, the insulating member 50 is integrally formed with the outer diameter side coil bar 31A and the inner diameter side coil bar 31B by being integrally formed (for example, insert molding) with the outer diameter side coil bar 31A and the inner diameter side coil bar 31B. . The insulating member 50 is formed separately from the outer diameter side coil bar 31A and the inner diameter side coil bar 31B, and is integrated with the outer diameter side coil bar 31A and the inner diameter side coil bar 31B by fitting, bonding, or fixing by a fastening member. May be used.

  As shown in FIG. 3, the insulating member 50 covers the outer peripheral surfaces of the outer diameter side coil bar 31 </ b> A and the inner diameter side coil bar 31 </ b> B except for both ends. The insulating member 50 is located between the outer diameter side coil bar 31A and the stator core 21, and between the inner diameter side coil bar 31B and the stator core 21, so that the insulating member 50 is positioned between the outer diameter side coil bar 31A and the stator core 21, and the inner diameter side coil bar. 31B and the stator core 21 are electrically insulated. The insulating member 50 electrically insulates the outer diameter side coil bar 31A from the inner diameter side coil bar 31B by holding the outer diameter side coil bar 31A and the inner diameter side coil bar 31B at positions separated from each other. . For example, the outer shape of the insulating member 50 is slightly larger than the inner shape of the slot 43. Accordingly, the coil bar unit 35 is easily fixed to the slot 43 by press-fitting the insulating member 50 into the slot 43 or by being bonded and fixed by applying an adhesive to the surface of the insulating member 50. The plurality of coil bar units 35 are arranged in a plurality of slots 43 so as to be arranged in the circumferential direction θ.

Next, the base plate assemblies 12A and 12B will be described.
As shown in FIG. 2, the pair of base plate assemblies 12 </ b> A and 12 </ b> B are separately arranged on both sides of the stator core assembly 11 in the axial direction Z. An insulating sheet 13 such as a silicon sheet (see FIG. 6) is disposed between the pair of base plate assemblies 12A, 12B and the stator core assembly 11. The insulating sheet 13 electrically insulates between the base plate assemblies 12 </ b> A and 12 </ b> B and the stator core assembly 11. One base plate assembly 12B is substantially the same as the other base plate assembly 12A except that it does not include a connection terminal portion connected to an external device or the like. Therefore, hereinafter, the base plate assembly 12A will be described as a representative.

FIG. 4 is a partially exploded perspective view showing the base plate assembly 12A.
As shown in FIG. 4, the base plate assembly 12 </ b> A includes a base plate 60 and a plurality of connector coils 32.

  The base plate 60 is formed in a substantially annular shape having substantially the same inner diameter and outer diameter as the stator core 21. The base plate 60 is made of, for example, an insulating synthetic resin. The base plate 60 has an outer surface 60 a facing the outside of the stator 3, and an inner surface 60 b located on the opposite side of the outer surface 60 a and facing the stator core 21. The base plate 60 has an opening 61, a connection hole 62, an outer surface groove 63, and an inner surface groove 64.

  The opening 61 is provided at the inner peripheral end of the base plate 60. The opening 61 passes through the base plate 60 in the axial direction Z. A small diameter part 31e of the outer diameter side coil bar 31A and a small diameter part 31e of the inner diameter side coil bar 31B are inserted into the opening 61. The insulating member 50 of the base plate 60 or the coil bar unit 35 may have a wall portion that electrically insulates between the outer diameter side coil bar 31 </ b> A and the inner diameter side coil bar 31 </ b> B inside the opening 61. Further, the opening 61 communicates with a refrigerant passage 56 described later of the coil bar unit 35. That is, the opening 61 functions as a supply port for supplying a refrigerant (for example, insulating oil) to the refrigerant passage 56 from the outside of the stator 3 or an exhaust port for discharging the refrigerant that has passed through the refrigerant passage 56 to the outside of the stator 3.

  The connection hole 62 is provided at the outer peripheral end of the base plate 60. The connection hole 62 penetrates the base plate 60 in the axial direction Z. A connection pin 65 described later is inserted into the connection hole 62. The outer surface groove 63 is provided on the outer surface 60 a of the base plate 60. The outer surface groove 63 has, for example, an outer shape along an involute curve, and connects the opening 61 and the connection hole 62 that are arranged apart from each other in the circumferential direction θ. On the other hand, the inner surface groove 64 is provided on the inner surface 60 b of the base plate 60. The inner surface groove 64 extends in a direction opposite to the outer surface groove 63 in the circumferential direction θ. The inner surface groove 64 has, for example, an outer shape along an involute curve, and connects the opening 61 and the connection hole 62 that are arranged apart from each other in the circumferential direction θ.

  The plurality of connector coils 32 are formed of a conductive material such as copper. Each of the plurality of connector coils 32 is an example of a “second coil portion” and an “outside slot coil portion”. The plurality of connector coils 32 include a plurality of outer connector coils 32A and a plurality of inner connector coils 32B. The plurality of outer connector coils 32 </ b> A are respectively accommodated in the outer surface grooves 63. One end of the outer connector coil 32A is disposed in the opening 61 and connected to the small diameter portion 31e of the outer diameter side coil bar 31A. The other end of the outer connector coil 32 </ b> A is disposed in the connection hole 62 and connected to the connection pin 65. On the other hand, the plurality of inner connector coils 32B are accommodated in the inner surface grooves 64, respectively. One end of the inner connector coil 32B is disposed in the opening 61 and connected to the small diameter portion 31e of the inner diameter side coil bar 31B. The other end of the inner connector coil 32 </ b> B is disposed in the connection hole 62 and connected to the connection pin 65.

  With the configuration as described above, the outer-diameter side coil bar 31A disposed in a certain slot 43 has another slot (for example, six in the circumferential direction θ) via the outer connector coil 32A, the connection pin 65, and the inner connector coil 32B. It is electrically connected to the inner diameter side coil bar 31B disposed in the separated slot 43). Accordingly, the plurality of outer diameter side coil bars 31A and the plurality of inner diameter side coil bars 31B belonging to the same phase among the U phase, the V phase, and the W phase are sequentially connected to form the distributed winding coil 22.

Next, the refrigerant passage 56 provided in the stator 3 of this embodiment will be described.
FIG. 5 is a view showing the coil bar unit 35 of the present embodiment.
As shown in FIG. 5, the insulating member 50 of each coil bar unit 35 includes a first holder portion 51, a second holder portion 52, and a passage forming portion 53. The first holder portion 51 is formed in an annular shape along the outer peripheral surface of the outer diameter side coil bar 31A and holds the outer diameter side coil bar 31A. The second holder portion 52 is formed in an annular shape along the outer peripheral surface of the inner diameter side coil bar 31B and holds the inner diameter side coil bar 31B.

  The passage forming part 53 is disposed between the first holder part 51 and the second holder part 52. The passage forming portion 53 includes a pair of support walls 55 a and 55 b and a refrigerant passage 56. The pair of support walls 55a and 55b extends in the direction in which the first holder portion 51 and the second holder portion 52 are arranged, and connects the first holder portion 51 and the second holder portion 52 that are arranged apart from each other. ing. The pair of support walls 55a and 55b are separated from each other in a direction crossing the direction in which the first holder portion 51 and the second holder portion 52 are arranged. The refrigerant passage 56 is formed by a space between the pair of support walls 55a and 55b. Thus, the refrigerant passage 56 is formed between the first holder portion 51 and the second holder portion 52 (between the outer diameter side coil bar 31A and the inner diameter side coil bar 31B) and is provided in the slot 43. .

FIG. 6 is a cross-sectional view showing the stator 3 of the present embodiment.
As shown in FIG. 6, the refrigerant passage 56 is provided along the longitudinal direction (axial direction Z) of the outer diameter side coil bar 31 </ b> A and the inner diameter side coil bar 31 </ b> B. In the present embodiment, the refrigerant passage 56 is a through passage that penetrates the stator core 21 in the axial direction Z. The refrigerant passage 56 is adjacent to the central portion in the axial direction Z of each of the outer diameter side coil bar 31A and the inner diameter side coil bar 31B in the radial direction R.

  As shown in FIG. 5, the passage forming portion 53 of the present embodiment has a refrigerant receiving portion 57 that receives a refrigerant supplied from the outside of the stator 3. For example, the refrigerant is supplied from the top to the bottom of the stator 3 (see FIG. 8). The refrigerant receiving portion 57 protrudes in the axial direction Z as compared with the end portions of the first holder portion 51 and the second holder portion 52. Thereby, at least a part of the refrigerant receiving portion 57 is arranged outside the stator core 21. For example, at least a part of the refrigerant receiving portion 57 is inserted into the base plate assembly 12A (or the base plate assembly 12B) (for example, the opening 61). Moreover, the refrigerant | coolant receiving part 57 has the bottom wall 57a and a pair of side wall 57b, 57c which stood up from the both ends of the bottom wall 57a, and forms the recessed part by which upper direction was open | released. The refrigerant receiver 57 changes the flow direction of the refrigerant supplied from above and guides the refrigerant toward the inside of the refrigerant passage 56.

  Further, as shown in FIG. 5, the refrigerant passage 56 has a cross-sectional area (flow path cross-sectional area, refrigerant) as it advances from one side to the other in the longitudinal direction (axial direction Z) of the outer diameter side coil bar 31A and the inner diameter side coil bar 31B. The cross-sectional area in a direction substantially perpendicular to the flow direction of the gas) gradually increases. In other words, the refrigerant passage 56 has a ceiling surface 56a and a bottom surface 56b inclined with respect to the ceiling surface 56a. The bottom surface 56b is inclined so as to gradually become lower as it proceeds from one end portion of the refrigerant passage 56 provided with the refrigerant receiving portion 57 toward the other end portion. Since the bottom surface 56 b is inclined, the refrigerant in the refrigerant passage 56 can flow by its own weight toward the downstream end of the refrigerant passage 56. For example, the bottom surface 56 b is inclined over the entire length of the refrigerant passage 56 in the axial direction Z.

FIG. 7 is a cross-sectional view showing a state when the coil bar unit 35 is manufactured.
As shown in FIG. 7, the refrigerant passage 56 is formed by inserting a mold core 71 when the insulating member 50 is integrally formed with the outer diameter side coil bar 31A and the inner diameter side coil bar 31B. ing. At this time, the bottom surface 56b of the refrigerant passage 56 functions as a draft of the mold core 71 with respect to the insulating member 50 by being inclined with respect to the ceiling surface 56a.

FIG. 8 is a perspective view showing a plurality of coil bar units 35 of the present embodiment.
As shown in FIG. 8, the plurality of coil bar units 35 that are adjacent in the circumferential direction θ are arranged with the inclination directions of the bottom surface 56 b opposite to each other. In other words, the plurality of coil bar units 35 adjacent in the circumferential direction θ are arranged with the refrigerant flow directions in the axial direction Z opposite to each other. That is, in this embodiment, the coil bar units 35 in which the refrigerant flows in the first direction and the coil bar units 35 in which the refrigerant flows in the second direction opposite to the first direction are alternately arranged in the circumferential direction θ. Has been.

FIG. 9 is a diagram showing two types of coil bar units 35 used in the present embodiment.
As shown in FIG. 9, the plurality of coil bar units 35 include a first specification coil bar unit 35A (hereinafter referred to as a first coil bar unit 35A) and a second specification coil bar unit 35B (hereinafter referred to as a second coil bar unit 35A). Coil bar unit 35B).

  The first specification coil bar unit 35 </ b> A includes a first insulating member 50 </ b> A as the insulating member 50. The refrigerant receiving portion 57 of the first insulating member 50A includes a bottom wall 57a along a direction intersecting (for example, substantially orthogonal to) the direction in which the outer diameter side coil bar 31A and the inner diameter side coil bar 31B are arranged, and both ends of the bottom wall 57a. And a pair of side walls 57b and 57c rising upward from the portion.

  On the other hand, the second specification coil bar unit 35 </ b> B includes a second insulating member 50 </ b> B as the insulating member 50. The refrigerant receiving portion 57 of the second insulating member 50B includes a bottom wall 57a along the direction in which the outer diameter side coil bar 31A and the inner diameter side coil bar 31B are aligned, and a pair of side walls that stand upward from both ends of the bottom wall 57a. 57b, 57c.

  Here, as shown in FIG. 9, the stator core 21 is divided into, for example, four regions (first region A1, second region A2, third region A3, and fourth region A4). The first region A1 is positioned above both of a pair of imaginary lines (first imaginary line L1 and second imaginary line L2) that respectively pass through the rotation center axis C and extend at an angle of 45 ° with respect to the horizontal plane. It is an area. The second area A2 is an area located below the first virtual line L1 and above the second virtual line L2. The third area A3 is an area located below both the first virtual line L1 and the second virtual line L2. The fourth region A4 is a region located above the first virtual line L1 and below the second virtual line L2.

  In the present embodiment, the first coil bar unit 35A is attached to the slot 43 located in the first region A1 and the third region A3 with the refrigerant receiving portion 57 facing upward. Note that the refrigerant receiving portion 57 being directed upward means that the remaining one of the space portions surrounded by the bottom wall 57a and the side walls 57b and 57c is directed upward (directly or obliquely upward). On the other hand, the second coil bar unit 35B is attached to the slot 43 of the second region A2 and the fourth region A4 with the refrigerant receiving portion 57 facing upward. Thereby, all the refrigerant | coolant receiving parts 57 of the coil bar unit 35 attached to the slot 43 of 1st to 4th area | region A1, A2, A3, A4 face upwards.

Next, the operation of the stator 3 of this embodiment will be described.
As shown in FIGS. 6 and 9, the coolant is supplied to the stator 3 from the top to the bottom. An example of the refrigerant is hydraulic oil used for lubrication and power transmission in, for example, an AT (automatic transmission) transmission.

  As shown in FIG. 6, a part of the refrigerant supplied from above enters the opening 61 of one base plate assembly 12 </ b> A (or the base plate assembly 12 </ b> B) and flows into the refrigerant passage 56 from the refrigerant receiving portion 57. . The refrigerant that has flowed into the refrigerant passage 56 flows in the slot 43 along the axial direction Z, and passes through the vicinity of the central portion in the axial direction Z of the outer diameter side coil bar 31A and the inner diameter side coil bar 31B. In this process, the refrigerant removes heat from the central portions of the outer diameter side coil bar 31A and the inner diameter side coil bar 31B. The refrigerant that has passed through the refrigerant passage 56 is discharged from the other base plate assembly 12B (or the base plate assembly 12A) to the outside of the stator 3.

  According to such a configuration, the cooling performance of the stator 3 can be improved. In other words, in the present embodiment, by supplying the refrigerant to the refrigerant passage 56 provided in the slot 43, the outer diameter side coil bar 31 </ b> A and the inner diameter side coil bar 31 </ b> B that are most likely to become the highest temperature among the coils 22 of the stator 3 are inserted into the slot 43. Can be cooled directly within. Thereby, coil bar 31A, 31B can be cooled efficiently compared with the case where coil bar 31A, 31B is cooled by heat conduction by cooling the coil part arrange | positioned outside the stator core 21, for example. Thereby, the cooling performance of the stator 3 can be improved.

  In the present embodiment, the refrigerant passage 56 is a through passage that is provided between the outer diameter side coil bar 31 </ b> A and the inner diameter side coil bar 31 </ b> B and penetrates the stator core 21. According to such a configuration, the refrigerant supplied to the refrigerant passage 56 can be guided near the central portion in the axial direction Z of the outer diameter side coil bar 31 </ b> A and the inner diameter side coil bar 31 </ b> B having the highest temperature among the coils 22. . Thereby, the center part of 31 A of outer diameter side coil bars and the inner diameter side coil bar 31B can be cooled more efficiently. Further, when the refrigerant passage 56 passes through the stator core 21, the refrigerant supplied to the refrigerant passage 56 from one surface side of the stator core 21 passes through the inside of the stator core 21 and is discharged from the other surface side of the stator core 21. For this reason, the easiness of the flow of the refrigerant in the refrigerant passage 56 can be increased, and the refrigerant having a low temperature can be supplied near the center of the outer diameter side coil bar 31A and the inner diameter side coil bar 31B. Thereby, the further improvement of the cooling performance of the stator 3 can be aimed at.

  In the present embodiment, since the refrigerant passage 56 is formed by the insulating member 50 disposed in the slot 43, the position and shape of the refrigerant passage 56 are easily stabilized. Further, when the coolant passage 56 is formed by the insulating member 50 for ensuring the insulation of the outer diameter side coil bar 31A and the inner diameter side coil bar 31B, the number of parts arranged in the slot 43 can be reduced, and The product ratio can be improved. Further, when the insulating member 50 is integrally formed with the outer diameter side coil bar 31A and the inner diameter side coil bar 31B, the refrigerant passage 56 is inserted into the slot 43 by the operation of inserting the outer diameter side coil bar 31A and the inner diameter side coil bar 31B into the slot 43. Can be placed in. Thereby, while providing the coolant channel | path 56, the stator 3 excellent in assemblability can be provided.

  In the present embodiment, the refrigerant passage 56 has an inclined bottom surface 56b. According to such a configuration, it is possible to improve the discharge performance of the refrigerant supplied to the refrigerant passage 56, and it is possible to supply the refrigerant having a low temperature near the center portions of the outer diameter side coil bar 31A and the inner diameter side coil bar 31B. . In addition, when the inclined bottom surface 56 b of the refrigerant passage 56 also serves as the draft of the mold core 71, the productivity of the insulating member 50 that forms the refrigerant passage 56 can be improved.

  In the present embodiment, the plurality of coil bar units 35 arranged in the circumferential direction θ of the stator core 21 are arranged so that the refrigerant flow directions are alternately opposite to each other. According to such a configuration, the thermal unevenness of the stator core 21 and the coil bars 31A and 31B in the axial direction Z of the stator core 21 can be reduced. Thereby, the further improvement of the cooling performance of the stator 3 can be aimed at.

  In the present embodiment, the refrigerant passage 56 has a refrigerant receiving portion 57 that is located outside the stator core 21 and into which the refrigerant is introduced. According to such a configuration, the amount of refrigerant flowing into the refrigerant passage 56 can be increased. Thereby, the further improvement of the cooling performance of the stator 3 can be aimed at.

(Second Embodiment)
Next, with reference to FIG. 10 and FIG. 11, the stator 3 of 2nd Embodiment is demonstrated. The stator 3 of the present embodiment is different from the first embodiment in that a part of the outer diameter side coil bar 31A and the inner diameter side coil bar 31B are directly exposed to the refrigerant passage 56. The configuration other than that described below is the same as the configuration of the first embodiment.

FIG. 10 is a front view showing the coil bar unit 35 of the present embodiment.
As shown in FIG. 10, in this embodiment, the insulating member 50 does not have a wall between the outer diameter side coil bar 31 </ b> A and the refrigerant passage 56 and between the inner diameter side coil bar 31 </ b> B and the refrigerant passage 56. The outer diameter side coil bar 31 </ b> A and the inner diameter side coil bar 31 </ b> B are directly exposed to the refrigerant passage 56. Thereby, the outer diameter side coil bar 31 </ b> A and the inner diameter side coil bar 31 </ b> B can directly contact the refrigerant flowing in the refrigerant passage 56. For example, the outer diameter side coil bar 31 </ b> A and the inner diameter side coil bar 31 </ b> B are exposed to the refrigerant passage 56 over the entire length in the axial direction Z of the insulating member 50.

  FIG. 11 is a cross-sectional view taken along line F11-F11 of the coil bar unit 35 shown in FIG. As shown in FIG. 11, in the present embodiment, inclined surfaces 81 are provided on the inner surfaces of the pair of support walls 55 a and 55 b of the refrigerant passage 56. The inclined surface 81 is inclined so that the cross-sectional area of the refrigerant passage 56 gradually increases as it proceeds from one to the other in the longitudinal direction of the coil bar 31. The inclined surface 81 functions as a draft angle of the mold core 71.

  According to such a configuration, the heat generated by the outer-diameter side coil bar 31A and the inner-diameter side coil bar 31B can be directly taken by the refrigerant without interposing the insulating member 50 having a thermal conductivity inferior to that of metal or the like. it can. Thereby, the cooling performance of the stator 3 can be further improved.

(Third embodiment)
Next, with reference to FIG. 12, the stator 3 of 3rd Embodiment is demonstrated. The stator 3 of the present embodiment is different from the first embodiment in that the refrigerant passage 56 is formed by a wick. The configuration other than that described below is the same as the configuration of the first embodiment.

FIG. 12 is a cross-sectional view showing the coil bar unit 35 of the present embodiment.
As shown in FIG. 12, in the present embodiment, the refrigerant passage 56 is formed by a wick 85 that guides the refrigerant by capillary action. The wick 85 is disposed, for example, between the outer diameter side coil bar 31A and the inner diameter side coil bar 31B. The wick 85 passes through the insulating member 50 in the axial direction Z. The wick 85 is provided integrally with the insulating member 50 by integral molding (for example, insert molding). For example, the wick 85 may be formed of a wire mesh or may be formed of a sintered metal. The wick 85 is not limited to a specific configuration as long as it allows the refrigerant to flow by capillary action.

  According to such a configuration, the refrigerant passage 56 can be formed even when it is difficult to provide the refrigerant passage 56 by space.

  Although the stator 3 according to the first to third embodiments has been described above, the configuration of the embodiment is not limited to the above example. For example, as shown in FIG. 13, the refrigerant passage 56 may be provided between the coil bar 31 and the slot wall portion 45 instead of between the plurality of coil bars 31 </ b> A and 31 </ b> B. For example, the refrigerant passage 56 is provided between the coil bar 31 and the slot wall portion 45 of the yoke portion 41. Instead of the above, the refrigerant passage 56 may be provided between the coil bar 31 and the slot wall portion 45 of the tooth portion 42.

Further, the refrigerant passage 56 is not limited to a through passage that penetrates the stator core 21 in the axial direction Z. For example, as shown in FIG. 14, the refrigerant passage 56 may stop in the middle of the stator 3 in the axial direction Z. In this case, the refrigerant passage 56 may be provided with a partition 91 that defines the flow direction of the refrigerant, for example.
The refrigerant passage 56 is not limited to the one formed by the insulating member 50 integrally formed with the coil bar 31. For example, the refrigerant passage 56 may be formed by inserting a pipe formed of an insulating material into the slot 43.

  As mentioned above, although the form for implementing this invention was demonstrated using embodiment, this invention is not limited to such embodiment etc., In the range which does not deviate from the summary of this invention, various deformation | transformation and substitution are carried out. Can be added. For example, the stator to which the present invention can be applied is not limited to a specific winding type or a specific winding shape, and basically applies to all types of winding types and all types of winding shapes. Is possible. The coil bar is formed of a conductive material such as copper as described above, but a magnet wire with a coating may be used.

  DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 3 ... Stator, 21 ... Stator core, 22 ... Coil, 31 ... Coil bar (coil part), 43 ... Slot, 45 ... Slot wall part, 50 ... Insulating member, 56 ... Refrigerant channel, 85 ... Wick

Claims (7)

A stator core having a slot;
A coil portion disposed in the slot as part of a segmented coil;
With
A stator for a rotating electrical machine, wherein a refrigerant passage along a longitudinal direction of the coil portion is provided in the slot. The stator core has a slot wall facing the slot;
The refrigerant passage is a through passage that is provided between the coil portion and another coil portion disposed in the slot or between the coil portion and the slot wall portion and penetrates the stator core. The stator for a rotating electrical machine according to claim 1.   The stator of a rotating electric machine according to claim 2, wherein the refrigerant passage is formed by an insulating member disposed in the slot.   4. The stator of a rotating electrical machine according to claim 3, wherein the refrigerant passage has a cross-sectional area that increases from one to the other in the longitudinal direction of the coil portion.   The refrigerant flow and another refrigerant passage located next to the refrigerant passage in the circumferential direction of the stator core are opposite to each other in the refrigerant flow direction in the axial direction of the stator core. The stator of the rotary electric machine as described in 2.   The stator of a rotating electrical machine according to claim 3, wherein the refrigerant passage has a refrigerant receiving portion into which at least a part is located outside the stator core and into which the refrigerant is introduced.   The stator of a rotating electrical machine according to claim 2, wherein the refrigerant passage is formed by a wick that guides the refrigerant by a capillary phenomenon.