JP2018143060A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine capable of appropriately cooling a coil while securing insulation properties against foreign matters.SOLUTION: A stator 10A of a rotary electric machine includes a stator core 21, a segmented multiple-phase coil 50, and base plates 31L, 31R. The coil 50 includes a plurality of slot coils 25 and a plurality of connection coils 40 that are disposed with respective base plates 31L, 31R and connect the slot coils 25 of the same phase mutually to configure a passage section. Outside connection coils 41 of the connection coil 40 are accommodated in an outer side face groove 37 of the base plates 31L, 31R. A height H1 of the outer side face groove 37 is higher than a height H2 of the outside connection coils 41. With the base plates 31L, 31R, an outer periphery side communication section 135 for communicating with an outer side face groove 37 is provided on an outer peripheral surface 31d, and a first inner peripheral side communication section 136 for communicating with the outer side face groove 37 is provided on an inner peripheral face 31e.SELECTED DRAWING: Figure 16

Description

  The present invention relates to a stator for a rotating electrical machine that can be mounted on an electric vehicle, a hybrid vehicle, or the like.

  As a stator of a rotating electrical machine, a rotating electrical machine using a segment coil has been proposed. For example, in Patent Document 1, a coil loop is formed by caulking and joining a slot coil disposed in a slot of a stator core and a connection coil serving as a transition portion disposed outside the stator core.

  On the other hand, in recent years, rotating electric machines have increased in output. Since the performance of the rotating electrical machine deteriorates as the temperature of the stator coil rises, measures such as cooling the stator coil have been studied.

JP 2013-027174 A

  When the stator coil is cooled by the refrigerant, the stator coil cannot be efficiently cooled unless the refrigerant flow path is appropriately set, which may cause a local temperature increase. In addition, the refrigerant may contain foreign matter, and if the foreign matter stays in the refrigerant flow path, it may conduct between adjacent coils, and insulation may not be ensured.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a stator for a rotating electrical machine capable of appropriately cooling a coil while ensuring insulation by foreign matter.

In order to achieve the above object, the invention described in claim 1
A stator core (for example, a stator core 21 according to an embodiment described later) having a plurality of slots (for example, a slot 23 according to an embodiment described later);
A segmented multi-phase coil (for example, a coil 50 according to an embodiment described later) and a stator for a rotating electrical machine (for example, a stator 10A, 10B of a rotating electrical machine according to an embodiment described later),
The stator core is provided with a base plate (for example, base plates 31L and 31R in the embodiments described later) on at least one side in the axial direction,
The segmented multi-phase coils are arranged in a plurality of slots of the stator core, respectively, and are arranged in a plurality of slot coils (for example, a slot coil 25 in the embodiment described later) and the base plate, respectively. A plurality of connection coils (for example, connection coil 40 in the embodiment described later) connecting the slot coils of the same phase to each other to form a crossing portion,
The connection coil (for example, the outer connection coil 41 of the embodiment described later) is accommodated in a connection coil housing groove (for example, an outer surface groove 37 of the embodiment described later) formed on the surface of the base plate,
A height of the connection coil housing groove (for example, a height H1 in an embodiment described later) is higher than a height of the connection coil (for example, a height H2 in an embodiment described later),
The base plate is provided with an outer peripheral side communication portion (for example, an outer peripheral side communication portion 135 of an embodiment described later) on an outer peripheral surface (for example, an outer peripheral surface 31d of the embodiment described later) communicating with the connection coil housing groove. An inner peripheral side communication portion (for example, a first inner peripheral side communication portion 136 in the later-described embodiment) is provided on the inner peripheral surface (for example, the inner peripheral surface 31e in the later-described embodiment). It is done.

The invention according to claim 2 is the invention according to claim 1,
On the surface of the base plate, an insulating plate (for example, an insulating plate 140 in an embodiment described later) that covers at least a part of the connection coil housing groove is provided.

The invention according to claim 3 is the invention according to claim 2,
The insulating plate covers all the connection coil housing grooves.

The invention according to claim 4 is the invention according to claim 2 or 3,
The insulating plate is provided with an engaging recess (for example, an engaging recess 141 in an embodiment described later) that engages with a wall section (for example, a partition wall 31b in an embodiment described later) that partitions the connection coil housing groove. ing.

The invention according to claim 5 is the invention according to any one of claims 1 to 4,
A refrigerant supply unit (for example, a refrigerant supply pipe 150 in an embodiment described later) is provided along the outer peripheral surface of the base plate.

The invention according to claim 6 is the invention according to any one of claims 1 to 5,
The connection coil includes an inner connection coil (for example, an inner connection coil 42 in an embodiment described later) and an outer connection coil (for example, an outer connection coil 41 in an embodiment described later) disposed at different positions in the axial direction,
In the base plate, the connection coil receiving grooves are formed on the outer surface and the inner surface, respectively.
The outer connection coil is disposed in an outer surface groove formed on the outer surface (for example, an outer surface groove 37 of an embodiment described later),
The inner connection coil is disposed in an inner surface groove formed on the inner surface (for example, an inner surface groove 38 in an embodiment described later),
The outer peripheral side communication portion includes an outer peripheral side communication portion (for example, an outer peripheral side communication portion 135 in an embodiment described later) that communicates with the outer surface groove, and an outer peripheral side communication portion (for example, described later) that communicates with the inner surface groove. Each of the outer peripheral side communication portion 135) of the embodiment,
The inner periphery side communication portion is an inner periphery side communication portion (for example, a first inner periphery side communication portion 136 in an embodiment described later) communicating with the outer surface groove, and an inner periphery side communication communicating with the inner surface groove. Each part (for example, a second inner peripheral side communication part 137 of the embodiment described later).

The invention according to claim 7 is the invention according to any one of claims 1 to 6,
A pair of the base plates are provided on both sides of the stator core in the axial direction.

According to the first aspect of the present invention, the connection coil is accommodated in the connection coil accommodation groove formed on the surface of the base plate, and the height of the connection coil accommodation groove is higher than the height of the connection coil. It can be used as a flow path.
Moreover, since the outer peripheral side communication part connected to the connection coil accommodation groove | channel is provided in the outer peripheral surface in the base plate, the connection coil accommodation in which the refrigerant supplied to the outer peripheral surface accommodates the connection coil via the outer peripheral side communication part Supplied to the groove, the connecting coil can be cooled.
Furthermore, since the base plate is provided with an inner peripheral side communication portion that communicates with the connection coil housing groove on the inner peripheral surface, even if a refrigerant containing foreign matter is supplied to the connection coil housing groove, It is discharged through the communication part. Therefore, foreign matter can be prevented from staying inside the base plate, and insulation between adjacent connection coils can be ensured.

  According to the second aspect of the present invention, since the insulating plate is provided on the surface of the base plate so as to cover at least a part of the connecting coil housing groove, even if a refrigerant containing foreign matter stays in the connecting coil housing groove, the insulating plate is insulated. Energization of adjacent connection coils via foreign substances is restricted by the plate.

  According to invention of Claim 3, the insulation between adjacent connection coils can be ensured more reliably because an insulating plate covers all the connection coil accommodation grooves.

  According to the fourth aspect of the present invention, the insulating plate is provided with the engaging recess that engages with the wall portion that defines the connecting coil housing groove, so that the insulating plate can more reliably cover the connecting coil housing groove. it can.

  According to the invention of claim 5, the connection coil can be uniformly cooled by the refrigerant from the refrigerant supply unit provided along the outer peripheral surface of the base plate.

  According to the invention of claim 6, the base plate is formed with an outer surface groove that accommodates the outer connection coil and an inner surface groove that accommodates the inner connection coil, and the outer peripheral side communicating portion communicates with the outer surface groove. Since the communication portion and the outer peripheral side communication portion communicating with the inner surface groove are provided, the refrigerant can be supplied from the outer peripheral surface to both sides of the base plate, that is, the outer surface side and the inner surface side. Therefore, the connection coils on both surfaces of the base plate can be evenly cooled. In particular, the inner connecting coil on the inner side facing the stator core is difficult to cool, but the inner connecting coil is efficiently cooled by supplying the refrigerant to the inner side groove via the outer peripheral side communicating portion communicating with the inner side groove. be able to.

  According to the seventh aspect of the present invention, the connection coils on both sides of the stator core can be evenly cooled by the pair of base plates located on both sides of the stator core.

It is a perspective view of the stator of the rotary electric machine of the reference example of this invention. It is a disassembled perspective view of the stator in the stator of the rotary electric machine of the reference example of FIG. FIG. 2 is an exploded perspective view of one base plate assembly in the stator of the rotating electrical machine of the reference example of FIG. 1. FIG. 5 is an exploded perspective view of the other base plate assembly in the stator of the rotating electrical machine of the reference example of FIG. 1. It is a perspective view of the slot coil in the stator of the rotary electric machine of the reference example of FIG. FIG. 2 is an exploded perspective view of a slot coil in the stator of the rotating electrical machine of the reference example of FIG. 1. It is a longitudinal cross-sectional view which shows a part of stator in the stator of the rotary electric machine of the reference example of FIG. It is a front view which shows a part of base plate assembly in the stator of the rotary electric machine of the reference example of FIG. FIG. 2 is a perspective view of a multi-phase coil in the stator of the rotating electrical machine of the reference example of FIG. 1. It is a perspective view which extracts and shows the coil for one phase from the coil of multiple phases shown in FIG. FIG. 2 is a development view showing a connection mode of a U-phase coil in the stator of the rotating electrical machine of the reference example of FIG. 1. It is a schematic diagram which shows the connection aspect of the coil of U phase, V phase, and W phase in the stator of the rotary electric machine of the reference example of FIG. It is a perspective view for demonstrating joining of the outer connection coil extension part and the inner connection coil extension part in the stator of the rotary electric machine of the reference example of FIG. In the stator of the rotating electrical machine of the reference example of FIG. 1, the inner diameter side end of the outer connection coil and the stepped portion of the outer diameter side slot coil, and the inner diameter side end of the inner connection coil and the stepped portion of the inner diameter side slot coil, It is a perspective view for demonstrating joining. In the stator of the rotary electric machine of the reference example of FIG. 1, it is a figure explaining the case where the outer side connection coils adjacent by the foreign material which stayed on the inner peripheral surface of the baseplate conduct | electrically_connected. It is the elements on larger scale of the baseplate used for the stator of the rotary electric machine of 1st Embodiment. It is the figure where the outer side connection coil and the inner side connection coil were arrange | positioned at the baseplate of FIG. It is the elements on larger scale of the stator of the rotary electric machine of 2nd Embodiment. It is an enlarged view of A part of FIG. It is the elements on larger scale which show engagement with the partition and insulation plate which concern on a modification. It is the elements on larger scale which show engagement with the partition which concerns on another modification, and an insulating plate.

<Reference example>
First, a stator of a rotating electrical machine according to a reference example of the present invention will be described with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

[Stator]
As shown in FIGS. 1 and 2, the stator 10 of the rotating electrical machine of the reference example includes a stator core assembly 20 and a pair of base plate assemblies 30L and 30R. The base plate assemblies 30L and 30R are the stator core assembly. It is arranged on both sides of 20 and assembled. Between the stator core assembly 20 and the base plate assemblies 30L, 30R, for example, an insulating sheet 65 such as a silicon sheet is disposed to insulate the stator core assembly 20 from the base plate assemblies 30L, 30R.

[1 Stator core assembly]
The stator core assembly 20 includes a stator core 21 and a plurality of slot coils 25.

[1-1 Stator core]
The stator core 21 is configured by, for example, laminating a plurality of pressed silicon steel plates, and includes a plurality of teeth 22 and a plurality of slots 23 formed between adjacent teeth 22 on the radially inner side. . The slot 23 is formed so as to penetrate in the axial direction of the stator core 21, is formed in a substantially oval shape that is long in the radial direction of the stator core 21 when viewed from the axial direction, and the opening 24 opens to the inner peripheral surface of the stator core 21. Yes. A plurality of fastening portions 15 that fasten the stator core 21 to a housing (not shown) are provided on the outer peripheral portion of the stator core 21.

[1-2 Slot coil]
The slot coil 25 inserted into each slot 23 has an outer-diameter side slot coil 26 and an inner-diameter side slot coil 27 which are plate-like conductors having a rectangular cross section with reference to FIG. 5A, FIG. 5B and FIG. The outer peripheral side slot coil 26 and the inner peripheral side slot coil 27 except for both ends in the axial direction are integrally formed by being coated with an insulating material 28 having a rectangular cross section such as injection molded resin. Specifically, the outer diameter side slot coil 26 has a length (L1 + 4 × L2) substantially equal to the sum of the axial width L1 of the stator core 21 and the axial width (4 × L2) of four connecting coils 40 described later. And both end portions in the axial direction are exposed from the insulating material 28 by a length (2 × L2) substantially equal to the axial width of the two connecting coils 40 in the axial direction. Further, one end of the outer diameter side slot coil 26 in the axial direction is notched in a stepped manner in a surface facing one side in the circumferential direction by a length (L2) equal to the axial width of one connection coil 40. The stepped portion 26a is formed by reducing the thickness, and the other axial end of the outer diameter side slot coil 26 is the other in the circumferential direction by a length (L2) equal to the axial width of one connecting coil 40. A stepped portion 26a is formed by cutting the surface facing the step into a step and reducing the plate thickness.

  The inner diameter side slot coil 27 is set to a length (L1 + 2 × L2) substantially equal to the sum of the axial width (L1) of the stator core 21 and the axial width (2 × L2) of two connecting coils 40 described later. Both end portions in the axial direction are exposed from the insulating material 28 by a length (L2) substantially equal to the axial width of one connection coil 40. Further, one end of the inner diameter side slot coil 27 in the axial direction is cut into a stepped shape with a surface facing the other in the circumferential direction by a length (L2) equal to the axial width of one connection coil 40. As a result, the step portion 27a is formed, and the other axial end portion of the inner diameter side slot coil 27 faces one side in the circumferential direction by a length (L2) equal to the axial width of one connection coil 40. The stepped portion 27a is formed by cutting the surface into a stepped shape and reducing the plate thickness.

  In other words, the slot coil 25 is exposed from the insulating material 28 on both sides in the axial direction by the length (2 × L2) of the outer diameter side slot coil 26 substantially equal to the axial width of the two connecting coils 40. The inner diameter side slot coil 27 is exposed from the insulating material 28 on both sides in the axial direction by a length (L2) equal to the axial width of one connection coil 40, and the outer diameter side slot coil 26 and the inner diameter side slot coil. Step portions 26a and 27a are formed at both tip portions of 27 so as to face the opposite side in the circumferential direction by a length (L2) equal to the axial width of one connection coil 40, respectively. Further, at one end in the axial direction and the other end in the axial direction, the stepped portions 26a of the outer diameter side slot coil 26 and the stepped portions 27a of the inner diameter side slot coil 27 are formed so as to face each other in the circumferential direction. Yes.

  The plurality of slot coils 25 including the outer diameter side slot coil 26 and the inner diameter side slot coil 27 are arranged so that the outer diameter side slot coil 26 is radially outward and the inner diameter side slot coil 27 is radially inner in each slot 23. The stator core 21 is arranged in the radial direction. Each slot coil 25 is inserted into a plurality of slots 23 of the stator core 21 and arranged in the circumferential direction of the stator core 21 to constitute the stator core assembly 20.

  The outer-diameter side slot coil 26 has tip portions protruding from both end faces 21a and 21b of the stator core 21 by a length (2 × L2) substantially equal to the axial width of approximately two connecting coils 40, respectively. The inner end side slot coil 27 inserted into the slot 23 protrudes from both end faces 21a and 21b of the stator core 21 by a length (L2) equal to the axial width of approximately one connection coil 40. As shown in FIG.

  Further, an insulating material 28 that covers both the slot coils 26 and 27 is interposed between the outer diameter side slot coil 26 and the inner diameter side slot coil 27 and the slot 23 of the stator core 21 to ensure insulation from the stator core 21. Has been.

  The insulating material 28 covering the outer diameter side slot coil 26 and the inner diameter side slot coil 27 has an outer peripheral surface slightly smaller than the slot 23 and substantially the same shape as the slot 23. As the insulating material 28, an epoxy resin, an enamel resin, or the like can be used.

  In the stator core assembly 20 configured as described above, the slot coil 25 is positioned with respect to the stator core 21 by press-fitting the slot coil 25 into each slot 23 of the stator core 21.

[2 Base plate assembly]
The base plate assemblies 30L and 30R respectively disposed on both sides of the stator core assembly 20 include base plates 31L and 31R and a plurality of connection coils 40 as shown in FIGS.

[2-1 Base plate]
The base plates 31 </ b> L and 31 </ b> R are substantially annular members that are formed of an insulating resin (nonmagnetic material) or the like and have inner and outer diameters substantially equal to the stator core 21.

  As shown in FIGS. 3 and 4, the inner diameter side of the base plates 31 </ b> L and 31 </ b> R correspond to the outer diameter side slot coil 26 and the inner diameter side slot coil 27 of each slot coil 25 inserted into the slot 23 of the stator core 21. Thus, a plurality of outer diameter side through holes 32 and a plurality of inner diameter side through holes 33 are formed so as to penetrate the base plate 31R at equal intervals and to communicate the outer surface 35 and the inner surface 36 with each other. By assembling the base plate assemblies 30L and 30R to the stator core assembly 20, the outer diameters of the base plates 31L and 31R are inserted into the slots 23 of the stator core 21 into the outer diameter side through holes 32 and project from the end faces 21a and 21b of the stator core 21. The distal end portion of the side slot coil 26 is disposed, and the distal end portion of the inner diameter side slot coil 27 that is inserted into the slot 23 of the stator core 21 and protrudes from the end faces 21a and 21b of the stator core 21 in the inner diameter side through holes 33 of the base plates 31L and 31R. Is placed.

  On the outer diameter side of the base plates 31L and 31R, a plurality of connecting coil joint holes 34 are formed so as to penetrate the base plates 31L and 31R at equal intervals so as to communicate the outer surface 35 and the inner surface 36. As shown in FIG. 7, the outer side surface 35 and the inner side surface 36 of the base plates 31L and 31R have a plurality of outer side surface grooves 37 and inner side surface grooves having substantially U-shaped cross-sections that open to the outer side surface 35 and the inner side surface 36, respectively. 38 is formed in the vicinity of the circumferential direction along the involute curve.

  The base plate 31L is provided with a fan-shaped portion 31a extending in a fan shape outward in the radial direction at the upper portion in the figure on the outer diameter side of the base plate 31L. In the fan-shaped portion 31a, input terminal cutout portions 34c in which the input terminal portions 43 are arranged are formed at equal intervals one by one, and bus bars 61U, 61V, 61W for connecting the coils in the same phase are connected to each other. A bus bar notch (not shown) in which a portion is arranged, and a mid-point bus bar notch (not shown) in which a mid-point bus bar 62 for connecting the U, V, and W phase coils to each other is provided. .

  In the connection coil joining holes 34 of the base plates 31L and 31R, an outer diameter side end portion 112 of the outer connection coil 41 and an outer diameter side end portion 123 of the inner connection coil 42 described later are arranged. The outer diameter side through hole 32, the inner diameter side through hole 33, and the connection coil joint hole 34 have a rectangular shape when viewed from the axial direction, and have a larger space than the coil member disposed inside them.

  In these base plates 31L and 31R, as shown in FIG. 6, the space between the outer surface grooves 37 and 37 adjacent to each other and the space between the inner surface grooves 38 and 38 are separated by a partition wall 31b standing from the base plate 31L. Further, the outer surface groove 37 and the inner surface groove 38 that face each other in the axial direction are separated by the intermediate wall 31c.

  The base plates 31L and 31R have the innermost diameter portion 39 in which the inner diameter side through-hole 33 is formed set to a length (L2) equal to the axial width of one connection coil 40, and the outer diameter side. The region other than the innermost diameter portion 39 in which the through hole 32 and the connection coil joining hole 34 are formed is the axial width (2 × L2) of the two connection coils 40 and the thickness (L3) of the intermediate wall 31c. The axial width (2 × L2 + L3) is set approximately equal to the total.

  In the base plate assemblies 30L and 30R, as shown in FIG. 7, each outer surface groove 37 of the base plates 31L and 31R has a connection coil joint hole 34 and a predetermined counterclockwise direction from the connection coil joint hole 34 in a front view. Are curved along an involute curve so as to be connected to the outer diameter side through holes 32 that are spaced apart from each other. In FIG. 7, a state in which an outer connection coil 41 and an inner connection coil 42 described later are accommodated in the outer surface groove 37 and the inner surface groove 38 is shown.

  Each of the inner side surface grooves 38 of the base plates 31L and 31R has a predetermined angle in the front view when viewed from the front side in the connection coil joint hole 34 and the connection coil joint hole 34 (clockwise as viewed from the side in FIG. 7). The inner diameter side through hole 33 that is separated is formed so as to be bent while avoiding the outer diameter side through hole 32.

  That is, the outer diameter side through hole 32 and the inner diameter side through hole 33 are connected via the connection coil joining hole 34 in which the outer surface groove 37 and the inner surface groove 38 are continuously connected in common.

[2-2 Connection coil]
The connection coil 40 is formed in a plate shape by a conductive material such as copper, and is divided into an outer connection coil 41 inserted into the outer surface groove 37 and an inner connection coil 42 inserted into the inner surface groove 38, respectively. be able to. The outer connection coil 41 referred to here is the connection coil 40 that is on the outer side in the axial direction of the stator 10 when the stator core assembly 20 and the base plate assemblies 30L and 30R are assembled. Is the connecting coil 40 which is the axially inner side of the stator 10.

  The outer connecting coil 41 is a plate-shaped conductor having a uniform thickness and a rectangular cross section, and the inner diameter side end portion 111 extends from the outer connecting coil main body 110 formed along the involute curve having the same shape as the outer surface groove 37. While being bent in the radial direction, the outer diameter side end portion 112 is also bent in the radial direction from the outer connecting coil body 110. An outer connecting coil extending portion 113 is formed at the outer diameter side end portion 112 of the outer connecting coil 41 so as to extend inward in the axial direction. The axial width (L2) of the outer connecting coil body 110 and the inner diameter side end portion 111 is equal to the groove depth of the outer surface groove 37, and the axial width (L4) of the outer connecting coil extending portion 113 is outer. The axial width (2 × L2 + L3) is set equal to the sum of the groove depths of the side groove 37 and the inner side groove 38 and the thickness (L3) of the intermediate wall 31c.

  The inner connecting coil 42 is a plate-like conductor having a uniform thickness and a rectangular cross section, and the inner connecting coil body 120 formed along the involute curve having the same shape as the inner side surface groove 38 has an outer diameter side through hole 32. The inner diameter side end portion 122 is bent in the radial direction via the bypass portion 121 formed so as to bypass the inner diameter, and the outer diameter side end portion 123 is also bent in the radial direction from the inner connection coil body 120. An inner connection coil extension portion 124 is formed at the outer diameter side end portion 123 of the inner connection coil 42 so as to extend outward in the axial direction. The axial width (L2) of the inner connecting coil main body 120 and the inner diameter side end portion 122 is equal to the groove depth of the inner side surface groove 38, and the axial width (L4) of the inner connecting coil extending portion 124 is the outer width. The axial width (2 × L2 + L3) is set equal to the sum of the groove depths of the side groove 37 and the inner side groove 38 and the thickness of the intermediate wall 31c.

  The outer connection coil 41 and the inner connection coil 42 have the same plate thickness, and the outer connection coil 41 and the inner connection coil 42 have the same plate thickness as the outer diameter side slot coil 26 and the inner diameter side slot. The same plate thickness as that of the coil 27 is set. The plate thickness of the outer connection coil 41 and the inner connection coil 42 is smaller than the axial width (L2) of the outer connection coil 41 and the inner connection coil 42 (the outer connection coil body 110 and the inner connection coil body 120). Note that “the axial width of x (x = 1, 2, 4) of the connection coils 40” described above means the axial width of the outer connection coil body 110 and the inner connection coil body 120. Further, “substantially equal” is an expression including an error corresponding to the intermediate wall 31c. The thickness of the insulating sheet 65 was not considered.

  The outer connection coil 41, the inner connection coil 42, and the slot coil 25 are processed by press punching or the like from a metal plate (for example, a copper plate) having a predetermined plate thickness, so that a desired axial width and a desired planar shape are obtained. Can be formed. Further, for the outer connection coil 41, an outer connection coil body 110 formed along an involute curve having the same shape as the outer surface groove 37 by bending a punched plate-shaped conductor, and the outer connection coil body 110 The inner diameter side end portion 111 and the outer diameter side end portion 112 which are connected so as to be bent can be formed. Similarly, for the inner connection coil 42, the inner connection coil body 120 formed along the involute curve having the same shape as the inner surface groove 38 by bending a punched plate-shaped conductor, and the inner connection coil body An inner diameter side end portion 122 and an outer diameter side end portion 123 connected so as to be bent from 120 can be formed.

  The outer connection coil 41 is inserted into the outer surface groove 37 of the base plates 31L and 31R. The inner diameter side end portion 111 of the outer connection coil 41 is disposed in the outer diameter side through hole 32. As shown in FIG. 13, when the stator core assembly 20 and the base plate assemblies 30L and 30R are assembled, the slots of the stator core 21 are similarly formed. 23 is in contact with the stepped portion 26a of the outer diameter side slot coil 26 inserted into the outer diameter side through hole 32.

  The inner connection coil 42 is inserted into the inner side surface groove 38 of the base plates 31L and 31R. The inner diameter side end portion 122 of the inner connection coil 42 is disposed in the inner diameter side through hole 33. As shown in FIG. 13, when the stator core assembly 20 and the base plate assemblies 30L and 30R are assembled, the slots 23 of the stator core 21 are also formed. Is inserted into the inner diameter side through-hole 33 and contacts the stepped portion 27 a of the inner diameter side slot coil 27.

  As shown in FIG. 12, the outer diameter side end portion 112 of the outer connection coil 41 and the outer diameter side end portion 123 of the inner connection coil 42 are both disposed in the connection coil joint hole 34, and the outer connection coil extension portion. The side surface 113a facing one circumferential direction of the 113 and the side surface 124a facing the other circumferential direction of the inner connecting coil extending portion 124 are in contact with each other over the entire radial and axial directions.

[3 Joining]
The inner diameter side end 111 of the outer connection coil 41 and the stepped portion 26a of the outer diameter side slot coil 26, the inner diameter side end 122 of the inner connection coil 42 and the stepped portion 27a of the inner diameter side slot coil 27, which are in contact with each other, and the outer side The outer connecting coil extending portion 113 of the connecting coil 41 and the inner connecting coil extending portion 124 of the inner connecting coil 42 are both welded, preferably laser welded, with planar plate surfaces intersecting the plate thickness direction. Are joined together. In the following description, the case of joining by laser welding will be described as an example.

  As shown in FIG. 12, the outer connection coil extension portion 113 and the inner connection coil extension portion 124 are both planar plate surfaces that intersect the axial direction and extend along the axial direction. The side surfaces 113a facing the circumferential direction of the extending portion 113 and the side surfaces 124a facing the other circumferential direction of the inner connecting coil extending portion 124 are brought into contact with each other so that the respective plate surfaces are in the entire radial and axial directions. Surface contact is made. In a state where both side surfaces 113a and 124a are in surface contact, laser welding is performed along the contact surface P1 extending in the radial direction from the outer side in the axial direction of the connection coil joint hole 34 to be bonded at the contact surface P1. Thereby, the outer diameter side end 112 of the outer connection coil 41 and the outer diameter side end 123 of the inner connection coil 42 located in the same connection coil joint hole 34 are electrically connected, and the base plate assemblies 30L and 30R are connected. Composed. In FIG. 12, the base plates 31L and 31R are omitted. The same applies to FIG.

  As shown in FIG. 13, in the assembly of the stator core assembly 20 and the base plate assemblies 30L and 30R, the outer connection is achieved by assembling the insulation sheet 65 in the axial direction with the relative positions in the circumferential direction being interposed. The inner diameter side end portion 111 of the coil 41 and the stepped portion 26a of the outer diameter side slot coil 26 come into contact with each other, and the inner diameter side end portion 122 of the inner connection coil 42 and the stepped portion 27a of the inner diameter side slot coil 27 come into contact with each other. Both are positioned.

  The inner diameter side end portion 111 of the outer connection coil 41 that contacts the stepped portion 26a of the outer diameter side slot coil 26 has a side surface 111a facing the other circumferential direction which is a flat plate surface over the entire side surface 26b of the stepped portion 26a. At the same time, the bottom surface 111b contacts the entire bottom surface 26c of the stepped portion 26a. Along the contact surface P2 that extends in the radial direction from the outer side in the axial direction of the outer diameter side through-hole 32 in a state where the planar side surfaces 111a and 26b that intersect the axial direction and cross the plate thickness direction are in surface contact. It joins in contact surface P2 by laser welding.

  The inner diameter side end 122 of the inner connection coil 42 that abuts the stepped portion 27a of the inner diameter side slot coil 27 has a side surface 122a facing one side in the circumferential direction, which is a flat plate surface, over the entire side surface 27b of the stepped portion 27a. The bottom surface 122b contacts the entire bottom surface 27c of the stepped portion 27a. The laser is along the contact surface P3 extending in the radial direction from the outer side in the axial direction of the inner diameter side through hole 33 in a state where the planar both side surfaces 122a, 27b intersecting the plate thickness direction and in the axial direction are in surface contact. It joins in contact surface P3 by welding.

  By joining in this way, the outer diameter side slot coil 26 and the inner diameter side slot coil 27 inserted into the slot 23 of the stator core 21 are electrically connected via the outer connection coil 41 and the inner connection coil 42. In this state, the base plate assemblies 30L and 30R are assembled to the stator core assembly 20. The outer connection coil 41 and the inner connection coil 42 connect the slot coils 25 of the same phase (for example, U phase) to form a transition portion of the coil 50.

  Therefore, for example, as shown in FIG. 9, the outer diameter side slot coil 26 and the inner diameter side slot coil 27 arranged in the same slot 23 are connected to one end side (the front side in the figure) of the outer diameter side slot coil 26. The outer connection coil 41 is connected to the inner connection coil 42 that extends radially outward and in the clockwise direction, and is connected to the other end side (the rear side in the drawing) of the outer diameter side slot coil 26. The coil 41 extends radially outward and counterclockwise and is connected to the in-phase inner connection coil 42. Further, the inner connection coil 42 connected on one end side (the front side in the drawing) of the inner diameter side slot coil 27 extends radially outward and counterclockwise and is connected to the outer connection coil 41 of the same phase. The inner connection coil 42 connected on the other end side (the rear side in the figure) of the slot coil 27 extends radially outward and clockwise and is connected to the outer connection coil 41 having the same phase.

  Thus, the stator 10 is configured by assembling a pair of base plate assemblies 30L and 30R on both sides of the stator core assembly 20, and the segmented coils 50 have six coil loops each having the same structure. (U-phase coil 50U, V-phase coil 50V, and W-phase coil 50W) are formed. Each of the six coil loops (U-phase coil 50U, V-phase coil 50V, and W-phase coil 50W) has three sets of U-phase coils 50U, three sets of V-phase coils 50V, And three sets of W-phase coils 50W are wound in this order in the counterclockwise direction (see FIG. 10). 8 is a perspective view of a multi-phase coil extracted from the stator 10 for easy understanding, and FIG. 9 is a perspective view of a single-phase coil (for example, a U-phase). FIG. 10 is a developed view showing the connection mode of the U-phase coil, and FIG. 11 is a schematic diagram showing the connection mode of the U-phase, V-phase, and W-phase coils.

Referring to FIG. 10, the U-phase coil as an example will be described in more detail with reference to FIG. 10. The six coil loops constituting the U-phase coil have three coil loops (U loops) continuously in the clockwise direction. The three coil loops ( U loop) are continuously wound in the counterclockwise direction, and the U loop and the U loop are connected in series by the bus bar 61U. The outer-diameter side slot coil 26 and the inner-diameter side slot coil 27 which are disposed in one slot 23 and are covered with an insulating material 28 are composed of a coil constituting a U loop and a coil constituting a U loop. The current flow direction is the same direction.

  For example, focusing on one U loop, the outer connection coil 41 and the inner connection coil 42 are connected in this order from one end in the axial direction (right hand side in the figure) of the outer diameter side slot coil 26 disposed in the U phase slot 23. Then, it is connected to the inner diameter side slot coil 27 in the next U-phase slot 23. Thereafter, the inner connection coil 42 and the outer connection coil 41 are connected in this order from the other axial end of the inner diameter side slot coil 27 (the left hand side in the figure), and the outer diameter side slot coil in the next U-phase slot 23 is further connected. 26. Thereafter, the U loop is formed by repeating this connection configuration.

Similarly, the other two phases, i.e., also six coil loops that constitute the V-phase coil (W-phase coil), three V loops are wave winding in the opposite direction (W loops) and three V loops (W Loop ) Are connected in series by a bus bar 61U (bus bar 61W), and an outer diameter side slot coil 26 and an inner diameter side slot coil 27 arranged in one slot 23 constitute a V loop (W loop) and a V loop. ( W loop) and the current flow direction is the same direction. These U-phase coil 50U, V-phase coil 50V, and W-phase coil 50W are star-connected by a midpoint bus bar 62 as shown in FIG.

  Here, in order to prevent the performance of the rotating electrical machine from deteriorating as the temperature of the stator coil rises, it is considered to cool the connection coil 40. In the stator 10 of the rotating electrical machine of the reference example described above, as shown in FIG. 14, the outer peripheral surface 31d of the base plates 31L and 31R is provided with the outer peripheral side communication portion 135 that communicates with the connection coil joint hole 34 and the adjacent outer surface. The height H1 of the groove 37 is made higher than the height H2 of the outer connection coil 41, the outer peripheral side communication part 135 is used as the refrigerant introduction part, and the outer connection coil 41 arranged in the partition wall 31b on both sides and the outer surface groove 37 A space formed by the upper surface is defined as a refrigerant flow path. Then, the refrigerant supplied from the outer peripheral side communication portion 135 cools the outer connection coil 41 through a space formed by the partition walls 31b on both sides and the upper surface of the outer connection coil 41, and then the outer diameter side through hole 32. Then, it hits the inner peripheral surface 31e of the base plate 31L, 31R and is discharged from the outer surface groove 37.

  However, foreign matter FS such as iron powder may be mixed in the refrigerant, and when such foreign matter FS accumulates in the outer surface groove 37, there is a possibility that electrical conduction occurs between adjacent coils and insulation cannot be ensured. . FIG. 14 shows a case where the adjacent outer connecting coils 41 are electrically connected to each other by the foreign matter FS accumulated on the inner peripheral surface 31e in the outer diameter side through hole 32. Accordingly, the present invention provides stators 10A and 10B for rotating electrical machines according to first and second embodiments described below. The stators 10A and 10B of the rotating electrical machines of the first and second embodiments have the same structure as the stator 10 of the rotating electrical machine of the reference example, except that the shapes of the base plates 31L and 31R are different. Only the point will be described in detail.

<First Embodiment>
As shown in FIG. 15, the stator 10A of the rotating electrical machine according to the first embodiment has an outer peripheral side communication portion 135 that communicates with the outer peripheral surface 31d of the base plates 31L and 31R and the connection coil joint hole 34 on the outer surface groove 37 side. A plurality are provided along the direction. Further, as shown in FIG. 16, the height H1 of the adjacent outer surface groove 37 is higher than the height H2 of the outer connection coil 41.

  Furthermore, on the inner peripheral surface 31e of the base plates 31L and 31R, a first inner peripheral side communication portion 136 communicating with the outer surface groove 37 (outer diameter side through hole 32) and an inner side surface groove 38 (inner diameter side through hole 33). And a second inner peripheral side communication portion 137 communicating with the first inner peripheral side. According to the stator 10A of the rotating electrical machine of the first embodiment configured as described above, the refrigerant supplied from the outer peripheral side communication portion 135 is formed by the partition walls 31b on both sides in the circumferential direction and the upper surface of the outer connection coil 41. The outer connection coil 41 is cooled through the space, and then passes through the first inner peripheral side communication portion 136 from the outer surface groove 37 without hitting the inner peripheral surface 31e of the base plates 31L and 31R by the outer diameter side through hole 32. Discharged.

  Further, even when the refrigerant discharged from the outer surface groove 37 through the first inner peripheral side communication portion 136 through the outer diameter side through hole 32 passes through the inner diameter side through hole 33, the second inner peripheral side communication portion 137 is provided. Discharged through.

  As described above, according to the present embodiment, the outer connection coil 41 is accommodated in the outer surface groove 37 formed on the surfaces of the base plates 31L and 31R, and the height H1 of the outer surface groove 37 is equal to that of the outer connection coil 41. Since it is higher than the height H2, the outer surface groove 37 can be used as a refrigerant flow path.

  Further, the base plates 31L and 31R are provided with the outer peripheral side communication portion 135 that communicates with the outer surface groove 37 on the outer peripheral surface 31d, so that the refrigerant supplied to the outer peripheral surface 31d is outside via the outer peripheral side communication portion 135. It is supplied to the outer surface groove 37 that accommodates the connection coil 41, and the outer connection coil 41 can be cooled.

  Further, since the base plates 31L and 31R are provided with the first inner peripheral side communication portion 136 communicating with the outer surface groove 37 on the inner peripheral surface 31e, the refrigerant containing the foreign matter FS is temporarily supplied to the outer surface groove 37. Even if it is done, it is discharged through the first inner peripheral side communication portion 136. Therefore, the foreign material FS can be prevented from staying inside the base plates 31L and 31R, and insulation between the adjacent outer connecting coils 41 can be ensured.

Second Embodiment
In addition to the stator 10A of the rotating electrical machine of the first embodiment, the stator 10B of the rotating electrical machine of the second embodiment has an annular insulation covering the outer surface groove 37 on the outer surface of the base plates 31L and 31R as shown in FIG. A plate 140 is provided. In addition, the code | symbol 150 of FIG. 17 is the refrigerant | coolant supply pipe 150 arrange | positioned cyclically | annularly along the outer peripheral surface 31d of baseplate 31L, 31R. The refrigerant supply pipe 150 is provided with a plurality of discharge portions 151 so as to face the outer peripheral surfaces 31d of the base plates 31L and 31R or the outer peripheral side communication portion 135. The refrigerant supply pipe 150 may be provided on the entire circumference along the outer peripheral surface 31d of the base plates 31L and 31R, or may be provided only on the upper part. The refrigerant supply pipe 150 can also be used for the stator 10A of the rotating electrical machine of the first embodiment.

  The insulating plate 140 is made of an insulating material, for example, resin, and as shown in FIG. 18, an engagement recess 141 that engages with the partition wall 31b that defines the outer surface groove 37 is provided on the inner surface.

  According to the stator 10B of the rotating electric machine configured as described above, the engagement recess 141 engages with the partition wall 31b that defines the outer surface groove 37, so that the insulating plate 140 extends the outer surface groove 37 over the entire circumference. Will cover. Therefore, even when the foreign material FS is accumulated in the middle of the outer surface groove 37, the outer surface groove 37 is covered with the insulating plate 140, so that the adjacent outer connection coils 41 are electrically connected to each other through the foreign material FS. Can be avoided.

  The insulating plate 140 does not need to be provided over the entire outer surface of the base plates 31L and 31R, and is provided only on the portion where the foreign material FS is likely to accumulate, for example, on both sides with the rotation axis in front view. May be provided only.

  The insulating plate 140 is preferably integrated with the base plates 31L and 31R, and the engagement recess 141 and the partition wall 31b may be welded, bonded, or press-fitted. Furthermore, instead of the engaging recess 141, as shown in FIG. 19, the insulating plate 140 may be provided with an engaging hole 142 through which the partition wall 31b penetrates. As shown in FIG. The tip of the partition wall 31 protruding from the portion 142 may be welded (for example, IPW (Impulse Welder)) to form the welded portion 143.

  Although only the cooling structure for cooling the outer connection coil 41 has been described in the first embodiment, FIG. 17 also shows the cooling structure for cooling the inner connection coil 42. That is, the outer peripheral surface 31d of the base plates 31L and 31R is provided with a plurality of outer peripheral side communication portions 135 that communicate with the connection coil joining holes 34 on the inner surface groove 38 side along the circumferential direction. Further, the height of the adjacent inner side surface groove 38 is higher than the height H2 of the inner connection coil 42. Furthermore, the inner peripheral surface 31e of the base plates 31L and 31R is provided with a second inner peripheral side communication portion 137 that communicates with the inner side surface groove 38 (inner diameter side through hole 33).

  Therefore, the refrigerant supplied from the outer peripheral side communication portion 135 cools the inner connection coil 42 through the space formed by the partition walls 31b on both sides in the circumferential direction and the upper surface of the inner connection coil 42, and then the inner diameter side through hole At 33, the air is discharged from the inner surface groove 38 through the second inner peripheral side communication portion 137.

  As described above, according to the present embodiment, in addition to the effects of the first embodiment, the outer surface groove 37 is formed on the insulating plate 140 even when the foreign matter FS is deposited in the middle of the outer surface groove 37. Since it is covered, it can avoid that the outer side connection coils 41 which adjoin through the foreign material FS conduct | electrically_connect, and the insulation between adjacent connection coils can be ensured more reliably.

  In addition, the base plates 31L and 31R are provided with an outer peripheral side communication portion in which the outer peripheral side communication portion 135 communicates with the outer surface groove 37 and an outer peripheral side communication portion in communication with the inner surface groove 38, so that the refrigerant is transferred from the outer peripheral surface 31d. It can be supplied to both sides of the base plates 31L and 31R, that is, the outer surface side and the inner surface side. Therefore, the outer connection coil 41 and the inner connection coil 42 on both surfaces of the base plates 31L and 31R can be evenly cooled. In particular, the inner connecting coil 42 on the inner side facing the stator core 21 is difficult to cool, but the refrigerant is supplied to the inner side groove 38 efficiently through the outer peripheral side communication portion 135 communicating with the inner side groove 38. The connection coil 42 can be cooled. Furthermore, in this case as well, the refrigerant is discharged from the inner side surface groove 38 through the second inner peripheral side communication portion 137 through the inner diameter side through hole 33, so that the foreign material FS is prevented from staying inside the base plates 31L and 31R. it can.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, in the above-described embodiment, the triple slot type stator in which the coils of the same phase are arranged for every three slots adjacent in the circumferential direction is exemplified. A single slot type in which phase coils are arranged, or a double slot type stator in which in-phase coils are arranged in every two slots adjacent in the circumferential direction may be used.
Moreover, about the coil connection, not only the said embodiment but arbitrary specifications can be selected, and a serial connection and a parallel connection can also be selected suitably.
The slot coil 25 is not limited to a plate-like conductor having a rectangular cross section, and may be a cylindrical conductor having a circular cross section or a columnar conductor having a polygonal cross section. The coupling between the slot coil 25 and the connection coil 40 is performed by welding. It is not limited to joining by, but includes fastening by caulking. However, when the slot coil is a plate-like conductor, a slot coil in which a slit is formed at a desired position by pressing or the like can be easily manufactured.

10A Stator of rotating electric machine 10B Stator of rotating electric machine 21 Stator core 23 Slot 25 Slot coil 31b Partition (wall)
31d outer peripheral surface 31e inner peripheral surface 31L base plate 31R base plate 37 outer side surface groove (connection coil accommodation groove)
38 Inner surface groove
40 connecting coil 41 outer connecting coil 42 inner connecting coil 50 coil 135 outer peripheral side communication portion 136 first inner peripheral side communication portion (inner peripheral side communication portion)
137 2nd inner circumference side communication part (inner circumference side communication part)
140 Insulating plate 141 Engaging recess 150 Refrigerant supply pipe (refrigerant supply part)
H1 height (height of connecting coil receiving groove)
H2 height (connection coil height)

Claims (7)

A stator core having a plurality of slots;
A stator of a rotating electrical machine comprising a segmented multi-phase coil,
The stator core is provided with a base plate on at least one side in the axial direction,
The segmented multi-phase coils are arranged in a plurality of slots of the stator core, respectively, and are arranged on the base plate and connected to the slot coils of the same phase. A plurality of connecting coils constituting the crossover part,
The connection coil is housed in a connection coil housing groove formed on the surface of the base plate,
The height of the connection coil housing groove is higher than the height of the connection coil,
A stator of a rotating electrical machine, wherein the base plate is provided with an outer peripheral side communication portion communicating with the connection coil housing groove on an outer peripheral surface and an inner peripheral side communication portion communicating with the connection coil housing groove on an inner peripheral surface. . A stator for a rotating electrical machine according to claim 1,
A stator of a rotating electrical machine, wherein an insulating plate that covers at least a part of the connection coil housing groove is provided on a surface of the base plate. A stator for a rotating electrical machine according to claim 2,
The said insulating plate is a stator of a rotary electric machine which covers all the said connection coil accommodation grooves. A stator for a rotating electrical machine according to claim 2 or 3,
The stator of a rotating electrical machine, wherein the insulating plate is provided with an engaging recess that engages with a wall that defines the connection coil housing groove. A stator for a rotating electrical machine according to any one of claims 1 to 4,
A stator for a rotating electrical machine, wherein a refrigerant supply unit is provided along an outer peripheral surface of the base plate. A stator for a rotating electrical machine according to any one of claims 1 to 5,
The connection coil includes an inner connection coil and an outer connection coil arranged at different positions in the axial direction,
In the base plate, the connection coil receiving grooves are formed on the outer surface and the inner surface, respectively.
The outer connection coil is disposed in an outer surface groove formed in the outer surface,
The inner connection coil is disposed in an inner surface groove formed on the inner surface,
The outer peripheral side communication portion is a stator of a rotating electrical machine, and includes an outer outer peripheral side communication portion that communicates with the outer surface groove and an inner outer peripheral side communication portion that communicates with the inner surface groove. A stator for a rotating electrical machine according to any one of claims 1 to 6,
A pair of the base plates is provided on both sides of the stator core in the axial direction.

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