JP2014036493A - Coil and stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil and a stator capable of reducing a length in an axial direction.SOLUTION: A first winding part 50 and a second winding part 60 are formed so that each of them has one turn and flat wires of slot insertion parts 51, 52, 61, 62 have a cross-sectional longitudinal direction along the circumferential direction of a stator and a cross-sectional transverse direction along the radial direction of the stator. Coil end parts 53, 63 without lead-out parts 70a, 70b in the first winding part 50 and the second winding part 60 have crank shape parts 57, 67, respectively. The other coil end parts 54, 64 with the lead-out parts 70a, 70b have a crank shape part 81 at a crossover 80 connecting the first winding part 50 and the second winding part 60.

Description

  The present invention relates to a coil and a stator.

  Patent Document 1 and the like disclose a rotating electrical machine having a coil in which two continuous α-winding coils are formed and two overlapping winding coils are formed.

JP 2009-195005 A

  However, as shown in FIG. 11, since the coil with the α-coil expanded is used as a coil, a portion A in which the wire turns in the crank shape portion at the coil end portion is generated, and the axial length of the stator (stator) Becomes larger. In the meantime, the term “swivel” means that a surface or a conductor arranged in the stator radial outside of the coil in one of the pair of slot insertion portions is arranged in the stator slot, and the other is arranged in the stator radial inside in the other. In other words, it means that it is bent so that it can be replaced.

  An object of the present invention is to provide a coil and a stator capable of reducing the axial length.

  According to the first aspect of the present invention, there is provided a coil provided in a stator of a rotating electrical machine, wherein a conducting wire made of a rectangular wire is edgewise wound and has a pair of slot insertion portions and coil end portions corresponding to the slots of the stator. A first winding portion and a second winding portion having a pair of slot insertion portions corresponding to slots of the stator and a coil end portion, which is edgewise wound with a conducting wire comprising a rectangular wire connected to the first winding portion. The first winding portion and the second winding portion each have a number of turns of one turn, and the flat wire of the slot insertion portion has a flat cross-sectional longitudinal direction of the stator. The coil end portion of the first winding portion and the second winding portion without the lead-out portion is formed so that the cross-sectional short direction of the rectangular wire is the radial direction of the stator. , Each of the coil end portions having a crank shape portion and having a lead-out portion has a crank shape portion on a connecting wire connecting the first winding portion and the second winding portion. .

  According to the first aspect of the present invention, the rectangular wire of the slot insertion portion in the first winding portion and the second winding portion having the number of turns of one turn has the longitudinal direction of the cross section being the circumferential direction of the stator. It is formed so that the cross-sectional short direction is the radial direction of the stator. Further, in the first winding part and the second winding part, one coil end part without the lead part has a crank shape part, and the other coil end part with the lead part is the first coil end part. The connecting wire connecting the winding part and the second winding part has a crank shape part. Thereby, the turning part of a conducting wire can be eliminated from the crank-shaped part in the coil end part, and the axial length can be reduced.

The gist of the invention described in claim 2 is that, in the coil described in claim 1, a plurality of coils are connected at the lead-out portion and overlapped so as to enter the same slot.
According to invention of Claim 2, it becomes possible to connect the drawer | drawing-out parts of several coils easily by welding.

  As described in claim 3, in the coil according to claim 2, the lead-out portion is provided to be shifted in the circumferential direction, and the connection portions of the coils arranged in an overlapping manner are alternately arranged. .

  According to a fourth aspect of the present invention, in the coil according to the second or third aspect, the first coil and the second coil are displaced in the axial direction. It is good to be provided.

As described in claim 5, the coil according to any one of claims 1 to 4 may be configured to be short-turn wound.
6. The cylindrical stator core in which slots opened in the inner peripheral surface are arranged side by side in the circumferential direction as in claim 6, and any one of claims 1 to 5 inserted in the slot of the stator core. And a stator including the coil.

  According to the present invention, the axial length can be reduced.

(A) is a top view of the coil of embodiment, (b) is a front view of a coil, (c) is a bottom view of a coil, (d) is a longitudinal cross-sectional view in the AA line of (b). (A) is a plan view of the coil, (b) is a front view of the coil, (c) is a bottom view of the coil, and (d) is a longitudinal sectional view taken along line AA of (b). The top view which shows the arrangement | sequence of a coil. Coiled exploded perspective view The partial top view of a stator. Layout diagram of coil in slot (U phase only). (A) is a plan view of another example coil, (b) is a front view of the coil, (c) is a plan view of the coil, and (d) is a front view of the coil. The top view which shows the arrangement | sequence of the coil of another example. The layout figure of the coil in the slot of another example (only U phase). The layout figure of the coil in the slot of another example of another (U phase only). The front view of the coil for explaining a subject.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 5, a stator 10 of a motor as a rotating electrical machine includes a cylindrical stator core 20, a same-pole two-roll cassette coil 30, and a same-pole two-roll cassette coil 40. In the stator core 20, slots 21 that open to the inner peripheral surface are arranged side by side in the circumferential direction, and the same-polarity two-winding cassette coils 30 and 40 are inserted into the slots 21 of the stator core 20. The same-pole two-winding cassette coil 30 and the same-pole two-winding cassette coil 40 are alternately arranged adjacent to each other in the radial direction.

  Each of the same-polarity double-winding cassette coils 30 and 40 provided in the stator 10 of the motor as the rotating electrical machine is constituted by a single conducting wire, and is doubled as shown in FIGS. FIG. 1 shows the same-pole two-roll cassette coil 30, and FIG. 2 shows the same-pole two-roll cassette coil 40. Each of the same-polarity two-winding cassette coils 30 and 40 includes a first winding part 50 and a second winding part 60, and the first winding part 50 and the second winding part 60 are connected by a jumper 80. Are connected. The conducting wire is a rectangular wire having a rectangular cross section, and the first winding part 50 and the second winding part 60 are formed by edgewise winding a rectangular wire (conducting wire). Each of the first winding unit 50 and the second winding unit 60 has one turn.

  The first winding part 50 of each of the same-pole two-roll cassette coils 30 and 40 has a hexagonal shape when viewed from the radial direction of the stator core 20. As for the 1st winding part 50, slot insertion parts 51 and 52 are inserted in slot 21 of a stator core, respectively, and coil end parts 53 and 54 protrude from the end face of stator core 20 in the direction of an axis.

  The coil end portion 53 of the first winding portion 50 includes a pair of skewed portions 55 and 56 and a crank-shaped portion 57 formed between the pair of skewed portions 55 and 56 (FIG. 1C, FIG. 2 (c)). Skew portions 55 and 56 are formed so as to be inclined with respect to the slot insertion portions 51 and 52 from one end portions of the slot insertion portions 51 and 52. A crank-shaped portion 57 connects the skewed portions 55 and 56 to one end portions of the slot insertion portions 51 and 52 inserted into the separated slots (a pair of slots in the slot group) 21. A lane change is performed by one crank portion in the radial direction by the crank-shaped portion 57. In the slot 21, two slot insertion portions (slot insertion portions of adjacent two-casing cassette coils having the same polarity) are arranged, but the skew feeding portion 55 and the slot insertion portion 51 are radially outward (outer diameter side), The inclined portion 56 and the slot insertion portion 52 are radially inward (inner diameter side). The crank-shaped portion 57 is formed to connect the radially outer side and the inner side.

  The coil end portion 54 of the first winding portion 50 has a pair of skew portions 58 and 59. Skew portions 58 and 59 are formed to be inclined with respect to the slot insertion portions 51 and 52 from one end portions of the slot insertion portions 51 and 52. In the slot 21, two slot insertion portions (slot insertion portions of adjacent coils) are arranged. The skew feeding portion 58 and the slot insertion portion 51 are radially outward (outer diameter side), the skew feeding portion 59 and the slot. The insertion portion 52 is radially inward (inner diameter side).

  As described above, the first winding portion 50 has a pair of slot insertion portions 51 and 52 and coil end portions 53 and 54 corresponding to the slots of the stator, in which a conducting wire made of a flat wire is edgewise wound. Further, the first winding part 50 includes a crank-shaped part 57 in the coil end part 53. Further, the rectangular wires of the slot insertion portions 51 and 52 are inserted into the slot 21, and the longitudinal direction of the cross section of the flat wire is the circumferential direction of the stator, and the short direction of the cross section of the flat wire is the radial direction of the stator. It is formed to become.

  Similarly, the second winding portion 60 of each of the same-pole two-roller cassette coils 30 and 40 has a hexagonal shape when viewed from the radial direction of the stator core 20. As for the 2nd winding part 60, slot insertion parts 61 and 62 are inserted in slot 21 of a stator core, respectively, and coil end parts 63 and 64 protrude from the end face of stator core 20 in the direction of an axis. The coil end portion 63 of the second winding portion 60 includes a pair of skewed portions 65 and 66 and a crank-shaped portion 67 formed between the pair of skewed portions 65 and 66 (FIG. 1C, FIG. 2 (c)). Skew portions 65 and 66 are formed to be inclined with respect to the slot insertion portions 61 and 62 from one end portions of the slot insertion portions 61 and 62. A crank-shaped portion 67 connects the skewed portions 65 and 66 to one end portions of the slot insertion portions 61 and 62 inserted into the spaced slots (a pair of slots in the slot group) 21. A lane change is performed by one crank portion in the radial direction by the crank shape portion 67. In the slot 21, two slot insertion portions (slot insertion portions of adjacent two-pole cassette coils having the same polarity) are arranged, but the skew feeding portion 65 and the slot insertion portion 61 are radially outward (outer diameter side), The skew portion 66 and the slot insertion portion 62 are radially inward (inner diameter side). The crank shape portion 67 is formed to connect the radially outer side and the inner side.

  The coil end part 64 of the second winding part 60 has a pair of skew parts 68 and 69. Skew portions 68 and 69 are formed so as to be inclined with respect to the slot insertion portions 61 and 62 from one end portions of the slot insertion portions 61 and 62. In the slot 21, two slot insertion portions (slot insertion portions of adjacent two-casing cassette coils of the same polarity) are arranged, but the skew feeding portion 68 and the slot insertion portion 61 are radially outward (outer diameter side), The skewed portion 69 and the slot insertion portion 62 are radially inward (inner diameter side).

  As described above, the second winding portion 60 has a pair of slot insertion portions 61 and 62 corresponding to the slots of the stator and a coil end, in which a conducting wire made of a rectangular wire connected to the first winding portion 50 is edgewise wound. Parts 63 and 64. The second winding portion 60 includes a crank shape portion 67 at the coil end portion 63. Further, the rectangular wires of the slot insertion portions 61 and 62 are inserted into the slot 21, and the longitudinal direction of the rectangular wire is the circumferential direction of the stator, and the transverse direction of the rectangular wire is the radial direction of the stator. It is formed to become.

  Further, as to the arrangement of the slot insertion portions 51, 52, 61, 62 in the circumferential direction of the stator core 20, as shown in FIG. 1 (b) and FIG. In the continuous cassette coils) 30, 40, the slot insertion portion 51 of the first winding portion 50 is on the outer side in the circumferential direction, and the slot insertion portion 52 is on the inner side in the circumferential direction. Moreover, the slot insertion part 62 of the 2nd winding part 60 becomes the outer side of the circumferential direction, and the slot insertion part 61 becomes the inner side of the circumferential direction.

  1 has a winding start leading portion 70a and a winding end leading portion 70b. The same-pole two-roll cassette coil 40 shown in FIG. 2 has a winding start drawing portion 71a and a winding finishing drawing portion 71b. Each lead-out part 70a, 70b, 71a, 71b extends in the axial direction (drawn from the winding part). That is, the lead-out portions 70a, 70b, 71a, 71b are positioned at the coil end portions 54, 64, and the slot insertion portion 51 on the outer side in the circumferential direction of the pair of slot insertion portions 51, 52 in the first winding portion 50. And the conducting wire is drawn out from the slot insertion part 62 on the outer side in the circumferential direction of the pair of slot insertion parts 61 and 62 in the second winding part 60.

In FIGS. 1 and 2, the inclination angles θ 1 of the skew portions 55, 56, 58, 59, 65, 66, 68, 69 in the same-pole two-roller cassette coils 30, 40 are all constant.
For convenience, the expressions “winding start drawing portion” and “winding drawing lead portion” are used, but the coil winding process is not limited.

  The positions in the circumferential direction of the lead-out portions 70a, 70b, 71a, 71b in the coils 30, 40 arranged adjacent to each other in the radial direction are the same (arranged at overlapping positions). ). As shown in FIGS. 3 and 4, the ends of the lead-out portions 70 a, 70 b, 71 a, 71 b are directly joined to each other in each coil (same-polarity two-roll cassette coil) 30, 40. That is, the same-pole two-roll cassette coil 30, 40 has a lead-out portion 70b at the end of winding in the same-pole two-roll cassette coil 30 and a lead-out portion 71a at the start of winding in the same-pole two-roll cassette coil 40. The phase position is the same in the circumferential direction. That is, the lead-out portion 70b at the end of winding in the same-pole two-roller cassette coil 30 and the lead-out portion 71a at the start of winding of the same-pole two-roller cassette coil 40 on the inner side are at the same phase position in the circumferential direction. . Further, the same-pole two-roll cassette coil 30, 40 has a lead-out portion 70 a at the start of winding in the same-pole double-roll cassette coil 30 and a draw-out portion 71 b at the end of winding in the same-pole double-roll cassette coil 40. The phase position is the same in the circumferential direction. That is, the lead-out portion 70a at the beginning of winding in the same-polarity double-winding cassette coil 30 and the lead-out portion 71b at the end of winding of the outermost same-pole two-winding cassette coil 40 are in the same phase position in the circumferential direction. .

  In other words, as shown in FIG. 1, for the same-pole two-roll cassette cassette 30, the winding start end of the first winding portion 50 is connected to the skew starting portion 58 at the beginning of the winding before the apex of the coil end portion 54. Coil end portions 54 and 64 in the direction in which the winding end end of the second winding portion 60 is shortened and the skew end portion 69 at the end of winding before the apex of the coil end portion 64 is shortened. It is pulled out in the axial direction at a position offset from the apex position. That is, the winding start leading portion 70a in the same-polarity two-winding cassette coil 30 is set in the direction in which the winding start skew portion 58 in the coil end portion 54 becomes shorter, and the winding end in the same-polarity two-winding cassette coil 30 is ended. The lead-out portion 70b is pulled out in the axial direction at a position offset by a distance (L10 / 2) from the apex position of the coil end portions 54, 64 in the direction in which the winding end skew portion 69 in the coil end portion 64 becomes shorter. ing.

  Similarly, as shown in FIG. 2, the winding start skew portion 58 immediately after the apex of the coil end portion 54 is connected to the winding start end of the first winding portion 50 with respect to the same-polarity two-winding cassette coil 40. The coil end portions 54 and 64 of the coil end portions 54 and 64 are extended in the lengthening direction and the winding end end of the second winding portion 60 in the direction in which the skewed end portion 69 immediately after the apex of the coil end portion 64 is lengthened. It is pulled out in the axial direction at a position offset from the vertex position. That is, the winding start leading portion 71 a in the same-polarity two-winding cassette coil 40 extends in the direction in which the winding start skew portion 58 in the coil end portion 54 becomes longer, and the winding end in the same-polarity two-winding cassette coil 40 is finished. The lead-out portion 71b is pulled out in the axial direction at a position offset by a distance (L11 / 2) from the apex position of the coil end portions 54 and 64 in the direction in which the skewed end portion 69 of the coil end portion 64 becomes longer. ing.

  As shown in FIG. 1B and FIG. 2B, the connecting wire 80 of each two-pole cassette coil 30 and 40 having the same polarity is connected to the pair of slot insertion portions 51 and 52 in the first winding portion 50. The slot insertion part 52 on the inner side in the circumferential direction is connected to the slot insertion part 61 on the inner side in the circumferential direction of the pair of slot insertion parts 61 and 62 in the second winding part 60.

  As described above, in the first winding part 50 and the second winding part 60, the one coil end part 53, 63 without the lead-out parts 70a, 70b, 71a, 71b has the crank-shaped parts 57, 67, respectively. The other coil end portions 54, 64 having the lead portions 70 a, 70 b, 71 a, 71 b are connected to the connecting wire 80 connecting the first winding portion 50 and the second winding portion 60 with the crank-shaped portion 81 ( 1 (a) and FIG. 2 (a)). A lane change is performed by one crank portion in the radial direction by the crank shape portion 81.

  Therefore, as shown in FIG. 1, in the same-pole two-roll cassette coil 30, the position of the lead-out portion 70 a (winding start position) is on the left side with respect to the crank-shaped portion 81, and the position of the lead-out portion 70 b (winding end) Position) is on the right. As shown in FIG. 2, in the same-pole two-roll cassette coil 40, the position of the drawing portion 71 a (winding start position) is on the right side with respect to the crank-shaped portion 81, and the position of the drawing portion 71 b (winding end position). Is on the left. That is, the same-pole two-roll cassette coil 30 and the same-pole two-roll cassette coil 40 include the positions of the lead portions 70a, 70b, 71a, 71b (winding start position) and the positions of the lead portions 71a, 71b (end of winding). Is opposite to the crank-shaped portion 81.

  As shown in FIGS. 3 and 4, drawers (terminals) 70a, 70b, which are arranged so that the same-pole two-roll cassette coil 30 and the same-pole two-roll cassette coil 40 alternately overlap the slots 21 and face each other. 71a and 71b are interlaced and connected by TIG welding. In this way, a plurality of coils (the same-pole two-roll cassette coil 30 and the same-pole two-roll cassette coil 40) are connected by the lead-out portions 70a, 70b, 71a, 71b and overlapped so as to enter the same slot. Yes. That is, the same-pole two-roller cassette coil 30 and the same-pole two-roller cassette coil 40 are arranged so as to alternately overlap. At this time, the lead-out portions 70a, 70b, 71a, 71b are provided so as to be shifted in the circumferential direction, and the coils arranged in an overlapping manner (the same-pole two-roll cassette coil 30 and the same-pole two-roll cassette coil 40) The parts are arranged alternately. As shown in FIG. 1B and FIG. 2B, the coils 30 and 40 arranged in an overlapping manner are the first coil (the same-polarity two-winding cassette coil 30). ) And the connecting wire 80 of the second coil (the same-polarity two-winding cassette coil 40) are provided so as to coincide with each other in the axial direction.

  As shown in FIGS. 5 and 6, the same-polarity two-winding cassette coils 30 and 40 are inserted into the slots 21 of the stator core to constitute the entire coil (three phases). In FIG. 5, the connecting lines between the poles are omitted.

  Two or more coils (same-pole two-roll cassette coil) 30 and 40 are inserted into one slot. For example, ten conductors are inserted into one slot. In the connection diagram of FIG. 6, only the U phase is shown, but in the coil (stator), the U-phase two-pole cassette coil of the U phase, the two-pole cassette coil of the V phase, the W-phase A two-roll cassette coil with the same polarity is inserted. Each of the same-polarity two-roll cassette coils 30 and 40 has the configuration described with reference to FIG.

  FIG. 6 shows a state where the in-phase adjacent poles are connected by using the most radially inner inter-electrode connecting wire 90 and the most radially outer inter-electrode connecting wire 91. In FIG. 6, it is a full-pitch winding and the coil pitch is 5 slot pitch.

Next, the operation of the same-pole two-roll cassette coils 30 and 40 will be described.
As shown in FIGS. 1 and 2, the positions of the winding start drawing portions 70a and 71a and the winding end drawing portions 70b and 71b are opposite to the crank shape portion 81, that is, in FIG. 1, the winding start drawing portion 70a. Is “Left”, the drawing portion 70b at the end of winding is “Right”, in FIG. 2, the drawing portion 71a at the beginning of winding is “Right”, and the drawing portion 71b at the end of winding is “Left”. (Two-cassette cassette coil) 30 and 40 are prepared. Then, as shown in FIG. 5, the same-pole two-roll cassette coil 30 and the same-pole two-roll cassette coil 40 are alternately arranged in the slots 21 of the stator core 20, and the facing ends are joined (welded). ) As shown in FIG. 3, since the dimensions L1 and L2 of the crank-shaped portion 81 are the same on the inner periphery and the outer periphery of the stator core 20, the lead-out portions 70a and 70b (71a and 71b) are arranged in two rows.

  In this way, the structure is such that one turn of the same-polarity two-roll cassette coils 30 and 40 (two types of coils with different lead positions) are alternately inserted into the slots 21 and aligned in two lines in a straight line. . The double poled two-coil cassette coils (overlapping coils) 30, 40 are formed from edgewise coils, so that the crank-shaped part has no turning part, and the axial direction of the crank-shaped part The length does not jump out. Thus, there is no turning part and the axial length of the stator (stator) is small.

  By using the rectangular wire, in the stator 10 with the increased conductor space factor in the slot 21, a gap (L1) is secured when the coils 30 and 40 are welded together without increasing the coil end height. . Moreover, the clearance gap (L1) at the time of welding the coils 30 and 40 is ensured, without enlarging the inner-outer diameter of a coil end part. Therefore, as shown in FIG. 5, the welding rod (electrode rod) B is inserted from the outer diameter side toward the inner diameter side in the radial direction, and the drawing portion 70a and the drawing portion 71b (the drawing portion 70b and the drawing portion 71a) are connected. Welding (joining) is performed.

According to the above embodiment, the following effects can be obtained.
(1) As a configuration of the coil, each of the first winding unit 50 and the second winding unit 60 has one turn, and the rectangular wires of the slot insertion units 51, 52, 61, 62 are The rectangular wire is formed such that the longitudinal direction of the cross section of the flat wire is the circumferential direction of the stator and the short cross section of the flat wire is the radial direction of the stator. In the first winding part 50 and the second winding part 60, one coil end part 53, 63 without a lead part has a crank-shaped part 57, 67, respectively, and the other coil end with a lead part. The parts 54 and 64 have a crank-shaped part 81 on the connecting wire 80 that connects the first winding part 50 and the second winding part 60. Therefore, by using a flat wire, the conductor space factor in the slot 21 can be increased, and the crank-shaped portion in the coil end portion can be freed from the swivel portion of the conducting wire to reduce the axial length. . In addition, it is possible to easily mold a single lead wire by pressing the crank shape portion against the mold.

  (2) A structure in which one turn of the same-polarity two-roll cassette coils 30 and 40 (two types of coils having different lead positions) are alternately inserted into the slots 21 and aligned in two lines in a straight line. That is, the plurality of coils 30 and 40 are connected by the lead-out portions 70a, 70b, 71a, and 71b and overlapped so as to enter the same slot. Therefore, the lead portions of the plurality of coils can be easily connected by welding.

  explain in detail. In order to perform welding in a double coil, it is necessary to secure a gap at the tip, and it is possible to secure a gap for welding at the leading portion of the tip by making a plurality of turns of the coil. There is no way to connect them. In this embodiment, since the inclination angles θ1 of the skewed portions 55, 56, 58, 59, 65, 66, 68, 69 of the coil end portion are all the same, there is no need to increase the height of the coil end portion. A gap (distance L1 in FIG. 3) when welding the coils 30 and 40 can be secured. Further, a gap (distance L1) when welding the coils 30 and 40 can be secured without increasing the inner and outer diameters of the coil end portion. Therefore, as shown in FIG. 5, the welding can be performed by inserting the welding rod B in the radial direction between the coils 30 and 40. In this way, it is possible to secure a gap for welding the coils without increasing the inner and outer diameters of the coil end portion, and it is easy to weld the double coils.

  (3) The lead-out portions 70a, 70b, 71a, 71b are provided so as to be shifted in the circumferential direction, and the connection portions of the coils 30, 40 arranged in an overlapping manner are alternately arranged. Therefore, the coils 30 and 40 can be easily connected.

The embodiment is not limited to the above, and may be embodied as follows, for example.
In the above-described embodiment, in the coil 40 of FIG. 2, the drawing start portion 71 a at the start of winding and the drawing portion 71 b at the end of winding include the slot insertion portion 51 on the outer circumferential side of the pair of slot insertion portions 51 and 52, Of the pair of slot insertion portions 61, 62, the slot insertion portion 62 is pulled out from the outer circumferential slot insertion portion 62. In other words, the crossover 80 includes the slot insertion portion 52 on the inner side in the circumferential direction of the pair of slot insertion portions 51 and 52 and the slot insertion portion on the inner side in the circumferential direction of the pair of slot insertion portions 61 and 62. 61. Instead of this, as shown in FIGS. 7C and 7D, the winding start drawing portion 72a is moved from the circumferentially inner slot insertion portion 52 of the pair of slot insertion portions 51 and 52, and The draw-out portion 72b at the end of winding may be pulled out from the slot insertion portion 61 on the inner side in the circumferential direction of the pair of slot insertion portions 61 and 62. In other words, the connecting wire 80 is connected to the outer circumferential slot inserting portion 51 of the pair of slot inserting portions 51 and 52 and the outer circumferential slot inserting portion of the pair of slot inserting portions 61 and 62. 62 may be provided. Then, the coil 30 shown in FIGS. 7A and 7B and the coil 41 shown in FIGS. 7B and 7C are used to overlap each other as shown in FIG. In other words, the coils 30 and 41 arranged in an overlapping manner are provided such that the connecting wire 80 of the coil (first coil) 30 and the connecting wire 80 of the coil (second coil) 41 are shifted in the axial direction.

  The connection at this time is shown in FIG. In this case, when the coils are sequentially inserted into the slots, the position of the crank portion at the transition portion is shifted in the axial direction, so that interference such as bulging can be reduced.

  6 and 9, all-pitch winding is used, but instead of this, as shown in FIG. 10, short-pitch double-layer winding (where a coil of a different phase can enter in one slot) may be used. That is, the coil pitch is 4 slot pitch. In this case, since the inclination angle θ1 of the skew portion is constant, the height of the coil end portion can be further reduced by the amount that the coil pitch is shortened. FIG. 10 shows a state in which the in-phase adjacent poles are connected by using the innermost cross-border wire 92 and the outermost radial cross-wire 93.

  DESCRIPTION OF SYMBOLS 10 ... Stator, 20 ... Stator core, 21 ... Slot, 30 ... Same pole 2 series cassette coil, 40 ... Same pole 2 series cassette coil, 41 ... Same pole 2 series cassette coil, 50 ... 1st winding part , 51 ... Slot insertion part, 52 ... Slot insertion part, 53 ... Coil end part, 54 ... Coil end part, 57 ... Crank-shaped part, 60 ... Second winding part, 61 ... Slot insertion part, 62 ... Slot insertion 63, coil end part, 64 ... coil end part, 67 ... crank shape part, 70a ... drawer part, 70b ... drawer part, 71a ... drawer part, 71b ... drawer part, 72a ... drawer part, 72b ... drawer part, 80: Crossover, 81: Crank-shaped part.

Claims (6)

A coil provided in a stator of a rotating electrical machine,
A first winding portion having a pair of slot insertion portions corresponding to slots of the stator and a coil end portion, in which a conducting wire made of a rectangular wire is edgewise wound;
A second winding portion having a pair of slot insertion portions and a coil end portion corresponding to the slots of the stator, wherein a conducting wire made of a rectangular wire connected to the first winding portion is edgewise wound;
With
Each of the first winding part and the second winding part has a number of turns of one turn, and the flat wire of the slot insertion portion is flat and the longitudinal direction of the cross section of the flat wire is the circumferential direction of the stator. It is formed so that the cross-sectional short direction of the line is the radial direction of the stator,
In the first winding part and the second winding part, one coil end part having no lead part has a crank-shaped part, and the other coil end part having the lead part is the first coil end part. A coil having a crank-shaped portion on a connecting wire connecting the winding portion and the second winding portion.   The coil according to claim 1, wherein a plurality of coils are connected at the lead-out portion and overlapped so as to enter the same slot.   The coil according to claim 2, wherein a lead portion is provided so as to be shifted in a circumferential direction, and connecting portions of the coils arranged in an overlapping manner are alternately arranged.   4. The coil according to claim 2, wherein the overlapping coil is provided such that the connecting wire of the first coil and the connecting wire of the second coil are shifted in the axial direction. 5.   The coil according to any one of claims 1 to 4, wherein the coil is wound in a short section. A cylindrical stator core in which slots that open to the inner circumferential surface are arranged in the circumferential direction;
The coil according to any one of claims 1 to 5, which is inserted into a slot of the stator core;
A stator comprising: