JP2018182784A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine, which can secure insulation between coils with an inexpensive and simple structure while axial length of the rotary electric machine is suppressed.SOLUTION: A stator 10 of a rotary electric machine comprises: a stator core 21 having a plurality of slots 23; and a U phase coil 50U, a V phase coil 50V and a W phase coil 50W, which are segmented. The U phase coil 50U, the V phase coil 50V and the W phase coil 50W comprise: a plurality of slot coils 25 which are inserted into the plurality of slots 23 of the stator core 21 and which almost linearly extend; and a plurality of connection coils 40 which connect the slot coils 25 of the same phase and constitute a bridging section. The plurality of connection coils 40 are stored in an outer face groove 37 and an inner face groove 38, which are formed in insulation plates 31R and 31L, and insulation covers 150 are arranged in every other connection coil 40 in a circumferential direction in the plurality of connection coils 40 and are insulated.SELECTED DRAWING: Figure 11

Description

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

  In Patent Document 1, a crossover portion connecting coil bars of the same phase is constituted by an inner connect coil and an outer connect coil disposed at different positions in the axial direction in a state of being insulated by an insulating plate. A stator of a rotary electric machine is described which suppresses the extension in the axial direction and achieves the miniaturization of the stator.

Patent No. 5389109 gazette

  However, according to the stator of the rotary electric machine described in Patent Document 1, the insulation between adjacent connect coils is formed on the insulating plate, and is secured by the partition wall of the groove portion into which the connect coil is inserted. Therefore, in order to secure the creeping distance necessary for insulation between adjacent connect coils, it is necessary to increase the height of the partition wall, and the axial length of the rotating electrical machine becomes long, which makes it easy to mount on a vehicle. It could have an impact. Furthermore, when the insulating plate is made of resin, the insulating plate having high partition walls has problems that it is difficult to produce, such as production of a molding die and moldability. Further, although it is conceivable to insulate all the coil members constituting the stator coil, there is a problem that the manufacturing cost is increased, and there is room for improvement.

  An object of the present invention is to provide a stator of a rotary electric machine capable of securing insulation between connection coils with a low cost and simple structure while suppressing the axial length of the rotary electric machine.

In order to achieve the above object, the invention according to claim 1 is
A stator core (e.g., stator core 21 in an embodiment described later) having a plurality of slots (e.g., slots 23 in an embodiment described later);
A segmented multi-phase coil (for example, a U-phase coil 50 U, a V-phase coil 50 V, and a W-phase coil 50 W in an embodiment described later);
The segmented multi-phase coils are respectively inserted into the plurality of slots of the stator core, and the slots in phase with the plurality of slot coils (for example, slot coils 25 in the embodiment described later) extending substantially linearly. A stator of a rotating electrical machine (e.g., a stator of a rotating electrical machine in an embodiment described later) having a plurality of connecting coils (e.g., connection coils 40 in an embodiment described later) that connect coils to form a crossover portion 10) and
The plurality of connection coils are respectively formed in grooves (e.g., outer surface grooves 37 and inner surface grooves 38 in the embodiment described later) formed in insulating plates (e.g., the insulating plates 31L, 31R in the embodiment described later) Housed and
Insulating portions (for example, an insulating cover 150 and an insulating film 160 in the embodiment described later) are provided on every other connecting coil in the circumferential direction among the plurality of connecting coils.

In the invention described in claim 2, in the invention described in claim 1,
The insulating portion is an insulating cover (for example, an insulating cover 150 in an embodiment described later) fixed to the insulating plate.

In the invention according to claim 3, in the invention according to claim 2,
A refrigerant passage (for example, a refrigerant passage 151 in an embodiment described later) is formed by the groove portion in which the connection coil is accommodated and the insulating cover.

In the invention according to claim 4, in the invention according to claim 1,
The insulating portion is an insulating coating (for example, an insulating coating 160 in an embodiment described later) covering the connection coil.

In the invention according to claim 5, in the invention according to any one of claims 1 to 4,
The heights of the grooves (for example, the heights H1 and H3 of the grooves in the embodiment described later) are higher than the heights of the connection coil (e.g. the heights H2 and H4 of the connection coil in the embodiment described later) .

  According to the invention as set forth in claim 1, by providing the insulating portion to every other connecting coil in the circumferential direction, compared with the case where the insulating portions are provided to all the connecting coils, the insulation of the adjacent connecting coils is provided. It is possible to suppress the increase in manufacturing cost while securing the flexibility. In addition, since the height of the partition dividing the groove can be suppressed, the enlargement of the stator is suppressed. Furthermore, since the connecting coil without the insulating portion has high cooling performance, the influence on the cooling property of the coil can be reduced.

  According to the second aspect of the present invention, the space defined by the insulating cover and the groove can be made the storage space of the refrigerant by sealing the groove in which the connection coil is accommodated by the insulating cover. The connecting coil can be cooled effectively.

  According to the third aspect of the present invention, the connection coil can be efficiently cooled by flowing the refrigerant through the refrigerant passage formed by the groove portion and the insulating cover.

  According to the fourth aspect of the present invention, the insulating portion can be easily formed by coating the connecting coil with insulation, and the manufacturing cost can be suppressed.

  According to the fifth aspect of the present invention, since the insulation distance can be secured by the partition partitioning the groove, the insulation portion can be simplified and the manufacturing cost is reduced.

It is an appearance perspective view of a stator of rotation electrical machinery of one embodiment concerning the present invention. It is a disassembled perspective view of the stator of the rotary electric machine shown in FIG. It is a perspective view of three slot coils inserted in each slot of a stator core. It is a principal part disassembled perspective view of the inner connection coil arrange | positioned at the inner surface groove | channel of a 1st insulating plate, and the outer connection coil arrange | positioned at an outer surface groove | channel. It is a perspective view extracting and showing the joined state where the slot coil (inner diameter side slot coil) of the same phase was joined by the outside connection coil and the inside connection coil. It is principal part sectional drawing which shows the joining state in which three slot coils were joined with the outside connection coil and the inside connection coil, respectively. It is a schematic diagram which extracts and shows the connection structure of the outer diameter side slot coil of U phase. FIG. 18 is a perspective view showing a state in which the first insulating plate assembly is stacked on the second insulating plate assembly, and the inner connecting coil and the outer connecting coil of the first insulating plate assembly are joined to the inner side slot coil; . It is a perspective view of a U phase coil. 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 FIG. It is an outer side view of the insulation plate assembly which has an insulation structure of 1st Embodiment which concerns on this invention. (A) is a cross-sectional view taken along the line XIII-XIII of FIG. 11, (b) is a cross-sectional view corresponding to FIG. 12 (a) of a conventional insulating plate assembly. It is an outer side view of the insulation plate assembly which has an insulation structure of 2nd Embodiment based on this invention.

Hereinafter, a stator of a rotating electrical machine according to an embodiment of the present invention will be described with reference to the drawings.
[Status]
As shown in FIG. 2, the stator 10 includes a stator core assembly 20 and a pair of insulating plate assemblies 30L and 30R, and the insulating plate assemblies 30L and 30R are disposed on both sides of the stator core assembly 20. It is assembled.

[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 formed, for example, by 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 inner side in the radial direction. . The slots 23 are formed penetrating in the axial direction of the stator core 21 and formed in a substantially oval shape long in the radial direction of the stator core 21 when viewed from the axial direction, and the opening 24 is opened in the inner peripheral surface of the stator core 21. There is. A plurality of fastening portions 15 for fastening the stator core 21 to a housing (not shown) is provided on the outer peripheral portion of the stator core 21.

[1-2 slot coil]
The slot coil 25 inserted in each slot 23 also refers to FIGS. 3 and 6 and includes an outer diameter side slot coil 26 which is a plate-like conductor having a rectangular cross section, an intermediate slot coil 27 and an inner diameter side slot coil 28. Each slot coil 26, 27, 28 is insulated with a resin or the like formed by injection molding.

  The outer slot coil 26, the middle slot coil 27, and the inner slot coil 28 are set longer in this order. Specifically, the outer diameter side slot coil 26 is substantially equal to the sum of the axial width L1 (see FIG. 1) of the stator core 21 and the axial width (3 × L2) of three connecting coils 40 described later. The length (L1 + 3 × L2) is set, and the intermediate slot coil 27 has a length (approximately equal to the sum of the axial width L1 of the stator core 21 and the axial width (7 × L2) of seven connecting coils 40 L1 + 7 × L2) is set, and the inner side slot coil 28 has a length (L1 + 11 ×) substantially equal to the sum of the axial width L1 of the stator core 21 and the axial width (11 × L2) of 11 connecting coils 40. It is set to L2).

  As shown in FIG. 6, the outer diameter side slot coil 26, the intermediate slot coil 27, and the inner diameter side slot coil 28 are disposed radially inward from the outer diameter side of the slot 23 in this order. That is, the outer diameter side slot coil 26 is inserted on the outer diameter side of the slot 23, the inner diameter side slot coil 28 is inserted on the inner diameter side of the slot 23, and the middle slot coil 27 has an inner diameter with the outer diameter side slot coil 26. It is inserted between (in the middle of) the side slot coil 28.

  Further, the outer diameter side slot coil 26 projects from the one end face 21 a of the stator core 21 by an axial width (2 × L 2) of two sheets of the connection coil 40, and hence from the other end face 21 b of the stator core 21. Is inserted into the slot 23 so as to protrude by an axial width (L2) of one connection coil 40. Hereinafter, the outer diameter side slot coil 26 in the inserted state is also referred to as a convex outer diameter side slot coil 26.

  Furthermore, in the slot 23 circumferentially adjacent to the slot 23, the other one of the stator core 21 is projected so as to protrude from the one end face 21a of the stator core 21 by an axial width (L2) of one connection coil 40. The end face 21 b of the connecting coil 40 is inserted into the slot 23 so as to protrude by an axial width (2 × L 2) of two connection coils 40. Hereinafter, the outer diameter side slot coil 26 in the inserted state is also referred to as a concave outer diameter side slot coil 26.

  The convex and concave outer diameter slot coils 26 are alternately arranged in the circumferential direction of the stator core 21. That is, the radially outer slot coil 26 inserted in the slot 23 is alternately arranged in a convex state and a concave state in the circumferential direction of the stator core 21.

  An intermediate slot coil 27 is inserted into the slot 23 into which the convex outer diameter side slot coil 26 is inserted, at the inner diameter side of the outer diameter side slot coil 26. The intermediate slot coil 27 projects from the one end face 21 a of the stator core 21 by an axial width (3 × L 2) of three pieces of the connection coil 40, and hence from the other end face 21 b of the stator core 21. It is inserted into the slot 23 so as to protrude by an axial width (4 × L 2) for 40 four sheets. Hereinafter, the intermediate slot coil 27 in the inserted state is also referred to as the intermediate slot coil 27 in the concave state.

  Further, the intermediate slot coil 27 adjacent to the slot 23 in the circumferential direction and inserted into the slot 23 into which the concave outer diameter side slot coil 26 is inserted is connected to one end face 21 a of the stator core 21. The slot protrudes so as to protrude by an axial width (4 × L2) of the sheet, and therefore, protrudes by an axial width (3 × L2) of the connecting coil 40 from the other end face 21b of the stator core 21 It is inserted in 23. Hereinafter, the intermediate slot coil 27 in the inserted state is also referred to as the intermediate slot coil 27 in the convex state.

  The intermediate slot coil 27 inserted into the slot 23 on the inner diameter side of the outer diameter side slot coil 26 is alternately arranged in a concave state and a convex state in the circumferential direction of the stator core 21.

  The inner side slot coil 28 is inserted to the inner diameter side of the intermediate slot coil 27 in the slot 23 into which the convex outer diameter side slot coil 26 and the concave middle slot coil 27 are inserted. The inner diameter side slot coil 28 projects from the one end face 21 a of the stator core 21 by an axial width (6 × L 2) for six sheets of the connection coil 40, and hence, the connection is made from the other end face 21 b of the stator core 21. It is inserted into the slot 23 so as to protrude by an axial width (5 × L 2) of five sheets of the coil 40. Hereinafter, the inside diameter side slot coil 28 in the inserted state is also referred to as the inside diameter side slot coil 28 in the convex state.

  Accordingly, in the slots 23, the radially outer slot coil 26 in the convex state, the intermediate slot coil 27 in the concave state, and the inner slot coil 28 in the convex state are radially arranged from the radially outer side.

  Further, the slot 23 is adjacent to the slot 23 in the circumferential direction, and the slot 23 into which the concave outer diameter slot coil 26 and the convex intermediate slot coil 27 are inserted is the inner slot on the inner diameter side of the middle slot coil 27 The coil 28 is inserted. The inner diameter side slot coil 28 projects from the one end face 21 a of the stator core 21 by an axial width (5 × L 2) of five pieces of the connecting coil 40, and hence, the connection is made from the other end face 21 b of the stator core 21. It is inserted in the slot 23 so as to protrude by an axial width (6 × L 2) of six sheets of the coil 40. Hereinafter, the slot coil 25 in the inserted state is also referred to as a concave inner-diameter slot coil 28.

  As described above, each slot coil 25 (the outer diameter side slot coil 26, the intermediate slot coil 27, and the inner diameter side slot coil 28) is convexly and concavely circumferentially and radially in the plurality of slots 23 of the stator core 21. The stator core assembly 20 is configured by being alternately inserted in the state and aligned in the circumferential direction and the radial direction of the stator core 21.

  Further, between the outer diameter side slot coil 26, the middle slot coil 27 and the inner diameter side slot coil 28 and the slots 23 of the stator core 21, the insulating material covering the respective slot coils 26, 27 and 28 Insulation is secured.

[2 insulation plate assembly]
Insulating plate assemblies 30L and 30R disposed on both sides of the stator core assembly 20 respectively include insulating plates 31L and 31R and a plurality of connecting coils 40. Specifically, the insulating plate assemblies 30L and 30R are, in order from the axially outer side, the first insulating plate assemblies 301L and 301R, the second insulating plate assemblies 302L and 302R, and the third insulating plate assemblies 303L and 303R. And. Each of the insulating plate assemblies 301L, 301R, 302L, 302R, 303L, and 303R has a plurality of substantially annular first insulating plates 311L and 311R, second insulating plates 312L and 312R, and third insulating plates 313L and 313R, respectively. The connection coil 40 is of the same construction as that of the first embodiment.

  The first insulating plates 311L and 311R, the second insulating plates 312L and 312R, and the third insulating plates 313L and 313R are substantially annular members, and the outer diameter is gradually formed in this order (see FIG. 6). .

[2-1 insulation plate]
As shown in FIG. 6, the first insulating plate 311R, the second insulating plate 312R, and the third insulating plate 313R are substantially annular members formed of an insulating resin (nonmagnetic material) or the like. The inner diameters of the first insulating plate 311R, the second insulating plate 312R, and the third insulating plate 313R are slightly smaller than the diameter of an imaginary circle connecting the inner peripheral sides of the inner side slot coil 28 inserted in the slot 23. . In addition, since the respective insulating plates 311L, 311R, 312L, 312R, 313L, and 313R have substantially the same configuration, hereinafter, the first insulating plate 311R will be mainly described as an example.

  As shown in FIG. 4, on the inner diameter side of the first insulating plate 311 </ b> R, a plurality of through holes 32 communicating the outer surface 35 and the inner surface 36 are formed. The plurality of through holes 32 have substantially the same shape as the slots 23 and are formed on the same circumference at equal intervals corresponding to the slots 23.

  As shown in FIG. 6, the through hole 32 of the first insulating plate 311R is a hole through which a convex inner diameter side slot coil 28 joined to the outer connection coil 41 described later penetrates in the axial direction, and the inner side described later This is a bonding operation hole for bonding the connection coil 42 and the concave inner side slot coil 28. In the through holes 32 of the second insulating plate 312R, a convex intermediate slot coil 27 joined to an outer connection coil 41 described later and an inner slot coil 28 positioned on the inner radius side of the middle slot coil 27 extend in the axial direction It is a hole that penetrates and is a bonding operation hole for bonding an inner connection coil 42 described later and the intermediate slot coil 27 in a concave state. The through hole 32 of the third insulating plate 313R is provided with the inner side slot coil 28 positioned on the inner side of the outer side slot coil 26 and the outer side slot coil 26 in a convex state joined to the outer connection coil 41 described later. The intermediate slot coil 27 is a hole penetrating in the axial direction, and is a bonding operation hole for bonding an inner connection coil 42 described later and the outer diameter side slot coil 26 in a concave state.

  Further, on the outer diameter side of the first insulating plate 311R, a plurality of connection coil joint holes 34 which communicate the outer side surface 35 and the inner side surface 36 are formed at equal intervals. The connection coil bonding hole 34 is a through hole for bonding the outer diameter end 43 of the outer connection coil 41 and the outer diameter end 44 of the inner connection coil 42 by laser welding or the like.

  As shown in FIGS. 4 and 6, the outer side surface 35 and the inner side surface 36 have a plurality of outer side surface grooves 37 and an inner side surface groove 38 having a substantially U-shaped cross section respectively opened to the outer side surface 35 and the inner side surface 36. It is formed close to the circumferential direction.

  As shown in FIG. 4, each of the inner side surface grooves 38 connects the connecting coil joint hole 34 and the through hole 32 which is separated from the connecting coil joint hole 34 in the counterclockwise direction by a predetermined angle in a front view. , Substantially S-shaped. Further, each outer side surface groove 37 is formed in a substantially S shape so as to connect the connection coil joint hole 34 and the through hole 32 separated from the connection coil joint hole 34 by a predetermined angle in the clockwise direction ( Not shown). That is, in the first insulating plate 311R, the through hole 32 through which the convex inner diameter side slot coil 28 penetrates, and the through hole 32 where the inner diameter side slot coil 28 of the concave body spaced apart from the through hole 32 is located. The outer surface grooves 37 and the inner surface grooves 38 are connected via a connection coil joint hole 34 which is continuous in common.

  The depth H1 of the inner surface groove 38 is deeper than the thickness H2 of the inner connection coil 42 (the same as the axial width L2 shown in FIG. 5), and the depth H3 of the outer surface groove 37 is the thickness of the outer connection coil 41 It is deeper than H4 (the same as the axial width L2 shown in FIG. 5).

  The outer side grooves 37 and 37 and the inner side grooves 38 and 38, which are adjacent to each other, and the inner side grooves 38 and 38 are insulated by the partition 31b and an insulating structure to be described later. Is insulated by the intermediate wall 31c.

[2-2 Connection coil]
As shown in FIGS. 4 to 6, the connection coil 40 is formed of a conductive material such as copper in a plate shape, and is connected to the outer connection coil 41 and the inner surface groove 38 respectively inserted into the outer surface groove 37. It can be divided into the inner connection coil 42 to be inserted. The outer connection coil 41 and the inner connection coil 42 have the same thickness. The outer connection coil 41 referred to herein is the connection coil 40 which is axially outside of the stator 10 when the stator core assembly 20 and the insulating plate assemblies 30L and 30R are assembled, and the inner connection coil 41 is an inner connection coil. The reference numeral 42 refers to the connecting coil 40 that is on the inner side in the axial direction of the stator 10.

  Referring also to FIG. 5, the outer connection coil 41 is a plate-like conductor having a rectangular shape in cross section and having a uniform thickness (L2), and is an extended portion 41b integrally extended from the rectangular portion 41a and the rectangular portion 41a. And is formed in a substantially S-shape having the same shape as the outer side surface groove 37. The outer connecting coils 41 disposed on the first insulating plates 311L and 311R, the second insulating plates 312L and 312R, and the third insulating plates 313L and 313R have basically the same configuration, but are connected slots The size (radial direction width) of the rectangular portion 41 a differs according to the position of the coil 25. Here, when the outer connection coil 41 connected to the first insulating plate 311R is described as an example, when the outer connection coil 41 is inserted into the outer surface groove 37, the corner of the rectangular portion 41a corresponding to the through hole 32 is The thickness of the inner portion is reduced by about half to form a joint portion 41c with the inner side slot coil. Further, the extension portion 41 b is formed such that the thickness of the inner portion of the tip thereof is substantially reduced by half, and a joint portion 41 d with the inner connection coil 42 is formed.

  The inner connection coil 42 is a plate-like conductor having a rectangular shape in cross section and having a uniform thickness (L2), and has a rectangular portion 42a and an extending portion 42b integrally extended from the rectangular portion 42a. It is formed in a substantially S-shape having the same shape as the groove 38. The inner connection coils 42 disposed on the first insulating plates 311L and 311R, the second insulating plates 312L and 312R, and the third insulating plates 313L and 313R basically have the same configuration, but are connected slots The size (radial direction width) of the rectangular portion 42 a differs according to the position of the coil 25. Here, when the inner connection coil 42 connected to the first insulating plate 311R is described as an example, when the inner connection coil 42 is inserted into the inner surface groove 38, the corner of the rectangular portion 42a corresponding to the through hole 32 is The thickness of the inner portion is reduced by about half to form a joint 42c with the inner side slot coil 28. Further, the extending portion 42 b is formed so that the tip thereof is bent in a crank shape toward the outer surface side, and a joint portion 42 d with the outer connection coil 41 is formed.

  The outer connection coil 41 and the inner connection coil 42 may be formed into a desired axial width and a desired planar shape by performing processing such as press punching from a metal plate (for example, a copper plate) having a predetermined thickness. it can.

  As shown in FIG. 4, the inner connection coil 42 is inserted into the inner side surface groove 38 of the first insulating plate 311R. The joint portion 42 c of the inner connection coil 42 is disposed corresponding to the through hole 32. Thereby, when assembling the third insulating plate assembly 303R on the second insulating plate assembly 302R, the third insulating plate assembly 303R is inserted into the slot 23 of the stator core 21 and is in the concave state positioned in the through hole 32 (the through hole 32 on the left side in the figure). It abuts on the inner side slot coil 28.

  When the outer connection coil 41 is inserted into the outer surface groove 37 of the first insulating plate 311R, the bonding portion 41c of the outer connection coil 41 is disposed corresponding to the through hole 32. As a result, when assembling the third insulating plate assembly 303R on the second insulating plate assembly 302R, the inner side slot coil 28 in the convex state is inserted into the slot 23 of the stator core 21 and protrudes through the through hole 32. Abut.

  The joint 41 d of the outer connection coil 41 and the joint 42 d of the inner connection coil 42 are both disposed corresponding to the connection coil joint hole 34 as shown in FIG. 4, and the corresponding outer side as shown in FIG. 5. The lower surface of the joint portion 41d of the connection coil 41 and the upper surface of the joint portion 42d of the inner connection coil 42 abut on the entire surface.

[3 junction]
The joint portion 41c of the outer connection coil 41 and the inner side slot coil 28 in the convex state, the joint portion 42c of the inner connection coil 42 and the inner side slot coil 28 in the concave state, and the joint portion 41d of the outer connection coil 41 In each of the joint portions 42d of the inner connection coil 42, flat plate surfaces intersecting with each other in the thickness direction are joined by welding, preferably by laser welding. At this time, since any of the bonding portions is exposed on the outer surface side of the first insulating plate assembly 301R, it can be easily bonded. The same applies to the first insulating plate assembly 301L, the second insulating plate assemblies 302L and 302R, and the third insulating plate assemblies 303L and 303R.

  A third insulating plate assembly 303R in which a plurality of outer connection coils 41 and an inner connection coil 42 are incorporated in the outer surface grooves 37 and the inner surface grooves 38 of the third insulating plate 313R, respectively. When the coil 26, the intermediate slot coil 27, and the inner side slot coil 28 are disposed on the side of the stator core assembly 20 inserted, as shown in FIG. The end face of the radial side slot coil 26 abuts, and the joint portion 42c of each inner connection coil 42 and the end face of the outer diameter side slot coil 26 in each concave state abut. At the same time, the joint 41 d of the outer connection coil 41 and the joint 42 d of the inner connection coil 42 abut on each other.

  At this time, since the convex and concave states of the outer diameter side slot coil 26 are alternately arranged in the circumferential direction, the outer diameter side slot coil 26 in contact with the joint portion 41 c of the outer connection coil 41 is convex. Then, the outer diameter side slot coil 26 in contact with the joint portion 42c of the inner connection coil 42 is in a concave state.

  When the third insulating plate assembly 303R is disposed on the side surface of the stator core assembly 20, the outer surface of the joint portion 42c of the inner connection coil 42 is formed by cutting the through hole 32 of the third insulating plate 313R and the outer connection coil 41. It is exposed to the outer side through the notch 41e (see also FIG. 9).

  Therefore, it becomes possible to irradiate the laser from the outer surface of the third insulating plate assembly 303R to the joint. Thus, the joint 41 c of the outer connection coil 41 and the outer diameter slot coil 26 in the convex state, the joint 42 c of the inner connection coil 42 and the outer diameter slot coil 26 in the concave state, and the joint 41 d of the outer connection coil 41 And the joint 42d of the inner connection coil 42 can be laser welded from the outer side.

  When the third insulating plate assembly 303R is assembled to the stator core assembly 20, the middle slot coil 27 and the inner side slot coil 28 project axially through the through holes 32 of the third insulating plate 313R.

  FIG. 7 is a view schematically showing the connection state of the U-phase coil of the outer connection coil 41, the inner connection coil 42, and the outer diameter side slot coil 26 in the stator 10 of 6 turns and 72 slots. The outer connection coil 41 of the third insulating plate assembly 303R (41A in FIG. 7 for ease of understanding) and the inner connection coil 42 (42A in FIG. 7 for ease of understanding). Connection in solid lines, the outer connecting coil 41 (here, for simplicity in FIG. 7 referred to as 41 B) of the third insulating plate assembly 303L and the inner connecting coil 42 (here for ease of understanding) In Fig. 7, connection of 42B is shown by a dashed dotted line. Further, in FIG. 7, the outer side slot coil 26, the intermediate slot coil 27, and the inner side slot coil 28 of the same phase among the U phase, the V phase, and the W phase are hatched in the same manner.

  In the third insulating plate 313R of the third insulating plate assembly 303R, as indicated by the solid line in the figure, the outer connection coil 41A joined to the outer diameter side slot coil 26 in the convex state, and the outer diameter side slot coil 26 An inner connection coil 42A which is disposed on the same circumference and joined to the outer diameter side slot coil 26 in a recessed state spaced seven pieces from the outer diameter side slot coil 26 in the circumferential direction is outside the outer connection coil 41A. It joins at the diameter side end 43 and the outer diameter side end 44 of the inner connection coil 42A. That is, in the third insulating plate assembly 303R, the outer diameter side slot coils 26 arranged on the same circumference are connected at the connection pitch P1.

  Further, in the third insulating plate 313L of the third insulating plate assembly 303L, as indicated by the alternate long and short dash line in the figure, the outside diameter side slot coil 26 in the concave state (convex state on the third insulating plate assembly 303L side) The connection coil 41B is joined, disposed on the same circumference as the outer diameter side slot coil 26, and in a convex state in which five pieces are further separated from the outer diameter side slot coil 26 (concave on the third insulating plate assembly 303L side) The inner connection coil 42B joined to the outer diameter side slot coil 26 in the state (a) is joined at the outer diameter end 43 of the outer connection coil 41B and the outer end 44 of the inner connection coil 42B. That is, in the third insulating plate assembly 303L, the outer diameter side slot coils 26 arranged on the same circumference are connected at the connection pitch P2.

  Thus, the connection pitch P1 of the third insulating plate 313R of the third insulating plate assembly 303R and the connection pitch P2 of the third insulating plate 313L of the third insulating plate assembly 303L are set to different pitches.

  After the third insulating plate assemblies 303R and 303L are assembled on both side surfaces of the stator core assembly 20, the outer connecting coils are connected to the outer surface grooves 37 of the second insulating plates 312R and 312L as in the third insulating plate assembly 303R. 41 are inserted, and the second insulating plate assemblies 302R and 302L, in which the inner connection coil 42 is inserted in the inner side surface groove 38, are superimposed on the third insulating plate assemblies 303R and 303L. Bonding portions 41c and end surfaces of the respective intermediate slot coils 27 in the convex state, joint portions 42c of the respective inner connection coils 42, end surfaces of the respective intermediate slot coils 27 in the respective concave states, and the outer diameter side end portions 43 of the respective outer connection coils 41. The outer diameter side end 44 of each inner connection coil 42 is joined by laser welding or the like. Since the middle slot coil 27 axially protrudes from the through holes 32 of the third insulating plates 313R and 313L, the second insulating plate assemblies 302R and 302L can be easily joined to the middle slot coil 27.

  Thus, after the second insulating plate assemblies 302R and 302L are assembled, as shown in FIG. 8, the outer connection coil 41 is inserted into the outer surface grooves 37 of the first insulating plates 311R and 311L, and the inner surfaces The first insulating plate assemblies 301R and 301L, in which the inner connection coil 42 is inserted into the groove 38, are respectively superimposed on the second insulating plate assemblies 302R and 302L, and the joint portions 41c of the respective outer connection coils 41 and respective convex states The end face of the inner side slot coil 28, the joint portion 42c of each inner connection coil 42 and the end face of the inner side slot coil 28 in each concave state, and the outer diameter end portion 43 of each outer connection coil 41 and the inner connection coil 42. The outer diameter side end 44 is joined by laser welding or the like to assemble the stator 10. Also at this time, since the inner diameter side slot coil 28 protrudes in the axial direction from the inner diameter side of the second insulating plates 312R, 312L, the first insulating plate assemblies 301R, 301L can be easily joined to the inner diameter side slot coil 28 .

  By bonding in this manner, the outer diameter side slot coil 26, the intermediate slot coil 27, and the inner diameter side slot coil 28 inserted into the slots 23 of the stator core 21 are electrically connected via the outer connection coil 41 and the inner connection coil 42. The third insulating plate assemblies 303L and 303R, the second insulating plate assemblies 302L and 302R, and the first insulating plate assemblies 301L and 301R are axially inward of the stator core assembly 20 in the state of being connected in series. It is assembled in this order from. The outer connection coil 41 and the inner connection coil 42 of the first, second, and third insulating plate assemblies 301L, 301R, 302L, 302R, 303L, 303R are in-phase (for example, U) arranged on the same circumference. The slot coils 25 of one phase) are connected to each other to form a transition part (coil end) of the coil.

Subsequently, the connection of the coils 50 of the stator 10 of the rotating electrical machine configured as described above will be more specifically described with reference to FIG.
The U-phase inner diameter side slot coils 28 are connected in series via the U-phase outer connection coil 41 and the inner connection coil 42 of the first insulating plate assemblies 301L and 301R to form a first U-phase coil 51U, Middle slot coils 27 of the second phase are connected in series via the U-phase outer connection coil 41 and the inner connection coil 42 of the second insulating plate assemblies 302L and 302R to form a second U-phase coil 52U. The outer diameter side slot coils 26 are connected in series via the U-phase outer connection coil 41 and the inner connection coil 42 of the third insulating plate assemblies 303L and 303R to form a third U-phase coil 53U. Then, U-phase coil 50U is formed by connecting first to third U-phase coils 51U-53U in series. FIG. 9 is a perspective view of U-phase connection coil 50U.

  Similarly, the V-phase inner diameter side slot coils 28 are connected in series via the V-phase outer connection coil 41 and the inner connection coil 42 of the first insulating plate assemblies 301L and 301R to form a first V-phase coil 51V. The V-phase intermediate slot coils 27 are connected in series via the V-phase outer connection coil 41 and the inner connection coil 42 of the second insulating plate assemblies 302L and 302R to form a second V-phase coil 52V. The V-phase outer diameter side slot coils 26 are connected in series via the V-phase outer connection coil 41 and the inner connection coil 42 of the third insulating plate assemblies 303L and 303R to form a third V-phase coil 53V. Then, the first to third V-phase coils 51V to 53V are connected in series to form the V-phase coil 50V.

  Similarly, the W-phase inner diameter side slot coils 28 are connected in series via the W-phase outer connection coil 41 and the inner connection coil 42 of the first insulating plate assemblies 301L and 301R to form a first W-phase coil 51W. The W-phase intermediate slot coils 27 are connected in series via the W-phase outer connection coil 41 and the inner connection coil 42 of the second insulating plate assemblies 302L and 302R to form a second W-phase coil 52W. The W-phase outer diameter side slot coils 26 are connected in series via the W-phase outer connection coil 41 and the inner connection coil 42 of the third insulating plate assemblies 303L and 303R to form a third W-phase coil 53W. Then, the W-phase coil 50W is formed by connecting the first to third W-phase coils 51W to 53W in series.

  The U-phase coil 50U, the V-phase coil 50V, and the W-phase coil 50W thus connected are connected to the U-phase connection terminal 61U, the V-phase connection terminal 61V, and the W-phase connection terminal 61W at one end, and the other end is connected It is star-connected at the middle point 62.

[4 insulation structure of connecting coil]
Hereinafter, each embodiment of the insulation structure of the connection coil which is a feature of the present invention will be described. In addition, since the insulating structure of the connecting coil 40 of the first, second and third insulating plates 311R, 311L, 312R, 312L, 313R and 313L has the same structure, the insulating structure of the connecting coil is the same here The insulation structure of the connection coil 40 provided on the third insulation plate 313R of the insulation plate 31R will be described.

First Embodiment
FIG. 11 is an outer side view of the insulating plate assembly having the insulating structure of the first embodiment according to the present invention, and FIG. 12 (a) is a cross-sectional view taken along line XII-XII of FIG.
As shown in FIG. 11, in the third insulating plate 313R of the present embodiment, the opening faces of every other outer side surface groove 37 in the circumferential direction are covered with an insulating cover 150 made of an insulating material. That is, the outer connection coil 41 inserted in the outer surface grooves 37 alternately in the circumferential direction is covered and insulated by the insulating cover 150 which is an insulating portion.

  Accordingly, the outer connection coils 41 adjacent to each other in the circumferential direction are insulated by the partition 31 b defining the outer surface groove 37 and also insulated by the insulating cover 150. In addition, since the outer connection coil 41 (the outer connection coil 41 not having the insulating cover 150) in which the conductive portion is exposed is arranged alternately in the circumferential direction, the creepage distance between the outer connection coils 41 is large. It can be secured.

  Therefore, for the height H3 of the partition 31b of the third insulating plate 313R of the present embodiment, the conventional partition height H is, for example, from the outer surface of the outer connection coil 41 as shown in FIG. As shown in FIG. 12A, compared to the case where 3 mm or more is necessary, the distance can be reduced to, for example, about 1 mm from the outer surface of the outer connection coil 41. This facilitates the manufacture of the third insulating plate 313R. This insulating structure is similarly applied to the inner connection coil 42 inserted into the inner surface groove 38 of the third insulating plate 313R.

  Since at least two insulating plates 31R and 31L disposed on the left and right of the rotary electric machine 1 are required at the left and right, the axial length of the rotary electric machine 1 can be shortened by 4 mm in total. Furthermore, in the rotating electric machine 1 including the left and right three insulating plates 31R and 31L as in the rotating electric machine 1 of the present embodiment, the axial length can be shortened by about 12 mm in total, and the small size of the rotating electric machine 1 Can be

  Further, the refrigerant inlet port 152 is provided on the radially outer side of the insulating cover 150 covering the outer surface of the outer connection coil 41, and the refrigerant outlet 153 is provided on the radially inner side of the insulating cover 150. The refrigerant is discharged from the refrigerant discharge port 153 through the refrigerant passage 151 which is a space S defined by the insulating cover 150 and the outer connection coil 41 disposed in the outer surface groove 37. By covering the connecting coil 41 with the insulating cover 150, the influence on the coil cooling can be minimized. Further, since every other outer connection coil 41 in the circumferential direction is exposed without being covered with the insulating cover 150, the same cooling performance as the conventional one is maintained.

  As described above, according to the stator 10 of the rotating electrical machine according to the present embodiment, the plurality of connection coils 40 are accommodated in the outer surface grooves 37 and the inner surface grooves 38 formed in the insulating plates 31R and 31L, respectively. In addition, since the insulating cover 150 is provided on every other connecting coil 40 in the circumferential direction among the plurality of connecting coils 40, it is adjacent as compared to the case where the insulating cover 150 is provided on all the connecting coils 40. An increase in the manufacturing cost can be suppressed while securing the insulation of the connection coil 40. In addition, since the heights H1 and H3 of the partitions 31b partitioning the outer surface grooves 37 and the inner surface grooves 38 can be suppressed, the enlargement of the stator 10 is suppressed. Furthermore, since the connection coil 40 without the insulating cover 150 has high cooling performance, the influence on the cooling performance of the coil can be reduced.

  Further, since the insulating portion is the insulating cover 150 fixed to the insulating plates 31R and 31L, the insulating cover 150 seals the outer surface groove 37 and the inner surface groove 38 in which the connection coil 40 is accommodated. A space S defined by 150, the outer surface grooves 37 and the inner surface grooves 38 can be used as a storage space of the refrigerant, and the connection coil 40 can be effectively cooled.

  Further, since the refrigerant passage 151 is formed by the outer surface groove 37 and the inner surface groove 38 in which the connection coil 40 is accommodated, and the insulating cover 150, the refrigerant passage 151 is formed by the outer surface groove 37 and the inner surface groove 38 and the insulating cover 150. By flowing the refrigerant through the refrigerant passage 151, the connection coil 40 can be efficiently cooled.

  Further, since the heights H3 and H1 of the outer surface groove 37 and the inner surface groove 38 are higher than the heights H4 and H2 of the outer connection coil 41 and the inner connection coil 42, the outer surface groove 37 and the inner surface groove 38 are partitioned. The insulating distance can be secured by the dividing wall 31b, and the insulating portion is simplified to reduce the manufacturing cost.

Second Embodiment
FIG. 13 is an outer side view of an insulating plate assembly having an insulating structure according to a second embodiment of the present invention. As shown in FIG. 13, in the outer connection coil 41 of the present embodiment, every other outer connection coil 41 in the circumferential direction is insulated by the insulating film 160 which is an insulating portion.

  According to the stator 10 of the rotating electrical machine according to the present embodiment, since the insulating portion is the insulating film 160 covering the connection coil 40, the insulating portion can be easily formed by insulating coating the connection coil 40, The manufacturing cost can be reduced. The other configuration and operation are the same as those of the stator 10 of the first embodiment, so the description will be omitted.

  The present invention is not limited to the above-described embodiments, and appropriate modifications, improvements, and the like can be made.

DESCRIPTION OF SYMBOLS 10 Stator 21 of rotating electric machine Stator core 23 Slot 25 Slot coil 26 Outer diameter side slot coil (slot coil)
27 middle slot coil (slot coil)
28 Inner side slot coil (slot coil)
37 Outer side groove (groove)
38 Inner side groove (groove)
40 Connection coil 41 Outer connection coil (connection coil)
42 Inner connection coil (connection coil)
150 insulation cover (insulation part)
151 refrigerant passage 160 insulation coating (insulation part)
H1, H3 Groove height H2, H4 Connection coil height

Claims (5)

A stator core having a plurality of slots,
And a segmented multi-phase coil;
The segmented multi-phase coils are respectively inserted into the plurality of slots of the stator core, and a plurality of slot coils extending substantially in a straight line and a plurality of in-phase slot coils are connected to constitute a crossover section. A stator of a rotating electrical machine having a connecting coil;
The plurality of connection coils are respectively accommodated in grooves formed in the insulating plate,
A stator of a rotating electrical machine, wherein an insulating portion is provided on every other connection coil in a circumferential direction among the plurality of connection coils. It is a stator of the rotary electric machine of Claim 1, Comprising:
The stator of a rotating electrical machine, wherein the insulating portion is an insulating cover fixed to the insulating plate. It is a stator of the rotary electric machine of Claim 2, Comprising:
A stator of a rotating electrical machine, wherein a refrigerant passage is formed by the groove portion in which the connection coil is accommodated and the insulating cover. It is a stator of the rotary electric machine of Claim 1, Comprising:
The stator of a rotating electrical machine, wherein the insulating portion is an insulating film covering the connection coil. It is a stator of the rotary electric machine of any one of Claims 1-4, Comprising:
The stator of a rotating electrical machine, wherein the height of the groove is higher than the height of the connection coil.