JP2015050912A - Dynamo-electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the axial length of the coil end of a stator coil formed by bonding conductor segments, in a dynamo-electric machine stator.SOLUTION: A stator 10 includes a stator core 12 having a plurality of slots 18u, 20u, 18v, 20v, 18w, 20w, and a plurality of stator coils 22u, 24u, 22v, 24v, 22w, 24w formed by bonding a plurality of conductor segments 26, 28 inserted into the plurality of slots 18u, 20u, 18v, 20v, 18w, 20w on the outside of one end face of the stator core 12 in the axial direction at joints C1, C2, and wound around the stator core 12 side by side in the circumferential direction, in distributed winding. The joints C1, C2 of stator coils 22u, 24u, 22v, 24v, 22w, 24w inserted into slots adjacent in the circumferential direction are arranged differently from each other in the radial direction.

Description

  The present invention relates to a rotating electrical machine stator including a stator core having a plurality of slots and a stator coil formed by joining conductor segments inserted into the plurality of slots outside the stator core, and in particular, joining a plurality of conductor segments. About.

  2. Description of the Related Art Conventionally, as a stator of a rotating electrical machine, a structure including a stator core having a plurality of slots formed in the circumferential direction and a stator coil inserted into the plurality of slots and wound around the stator core is known.

  In Patent Document 1, when forming a plurality of stator coils arranged in a distributed winding by joining a plurality of conductor segments, leg portions projecting outward from one axial end surface of the stator core in the conductor segments are arranged in the circumferential direction of the stator. It is described that two conductor segments are joined by welding at the end of the bent portion at the end of the bent portion so as to be bent along the axial direction.

JP 2012-80699 A

  In the configuration described in Patent Document 1, a plurality of stator coils are arranged in distributed winding, and many of the portions formed by bending in the circumferential direction of the conductor segments are arranged side by side in the axial direction of the stator. As a result, the axial length of the coil end of the stator coil is increased, so that the axial length of the rotating electrical machine is increased.

  An object of the present invention is to provide a rotating electrical machine stator that can reduce the axial length of a coil end of a stator coil formed by joining conductor segments.

  A rotating electrical machine stator according to the present invention is formed by joining a stator core having a plurality of slots and a plurality of conductor segments inserted into the plurality of slots at joints outside an end surface in the axial direction of the stator core. A plurality of stator coils wound around the stator core in the circumferential direction with distributed winding, and the joint portions of the stator coils inserted into the slots adjacent in the circumferential direction are arranged differently in the radial direction. A plurality of stator coils.

  According to the rotating electrical machine stator of the present invention, the axial length of the coil end of the stator coil formed by joining the conductor segments can be reduced.

It is a perspective view which shows partially the rotary electric machine stator of embodiment of this invention. In the rotating electrical machine stator shown in FIG. 1, a view (A) in which the end portion of the stator coil on the joint side is viewed from the radially inner side to the outer side, and (A) is viewed from the axially outer side in the axial direction. It is the figure (B) shown extending in the direction. FIG. 2 is a perspective view showing a stator coil for one phase shown in FIG. 1 wound around a stator core. FIG. 4 is a diagram showing a front half annular portion on a power line connection side in the stator coil for one phase shown in FIG. 3. It is a figure shown in the state before inserting the 1st conductor segment which forms a 1st stator coil in a slot. FIG. 4 is a diagram showing a part of the stator coil for one phase shown in FIG. 3 in a radial direction inserted into a slot. It is the figure which looked at the junction side edge part of the stator coil shown in FIG. 6 in the axial direction. In the rotating electrical machine stator shown in FIG. 1, the end of the stator coil opposite to the joint is viewed from the radially inner side to the outer side. It is AA sectional drawing of FIG. It is a figure shown in the state before inserting the 2nd conductor segment which forms a 2nd stator coil in a slot. In the rotating electrical machine stator of the comparative example and the present invention, FIG. 4A is a view in which the end portion on the joint portion side of the stator coil is viewed in the radial direction, and FIG. It is a perspective view of the rotary electric machine stator of a comparative example.

  Embodiments according to the present invention will be described below with reference to the drawings. In the following description, the same reference numerals are used for the same elements in all drawings.

  FIG. 1 partially shows a rotating electrical machine stator 10. 2 is a diagram (A) of the rotating electrical machine stator 10 shown in FIG. 1 in which a part in the circumferential direction of the end portion on the joint portion side of the stator coil is viewed from the inside in the radial direction to the outside, and part in the radial direction in FIG. FIG. 5B is a diagram (B) showing the circumferential direction extending in the left-right direction when viewed from the outside in the axial direction. Hereinafter, the rotating electrical machine stator 10 is simply referred to as “stator 10”. The stator 10 is combined with a rotor (not shown) to form a rotating electrical machine. The rotating electrical machine is mounted on a vehicle and used as an electric motor, a generator, or a motor generator having both functions of the electric motor and the generator.

  The stator 10 is an annular stator core 12 and is wound around the inner peripheral side of the stator core 12 by distributed winding, and is formed by connecting a plurality of stator coils in an annular shape, which is a three-phase structure of u phase, v phase, and w phase. And connected stator coils 14u, 14v, 14w.

  The stator core 12 is a plurality of radial grooves formed between the salient poles 16 (FIG. 3) provided to project radially inward at a plurality of equally spaced positions in the circumferential direction and the adjacent salient poles 16. Slots 18u, 18v, 18w, 20u, 20v, and 20w are included. Stator core 12 is formed of a laminate of electromagnetic steel sheets.

  The plurality of slots 18u, 18v, 18w, 20u, 20v, 20w are a plurality of first slots 18u, 18v formed in the stator core 12 so as to be spaced apart in the circumferential direction at a predetermined interval d1 (FIG. 3) across the plurality of slots. , 18w and a plurality of second slots 20u, 20v, 20w formed adjacent to the first slots 18u, 18v, 18w and spaced apart at a predetermined interval d1 in the circumferential direction.

  The slots 20u, 18v, 20v, 18w and 20w are arranged adjacent to each other on one side in the circumferential direction (left side in FIG. 1) of the slots 18u, 20u, 18v, 20v and 18w.

  A u-phase first stator coil 22u and a second stator coil 24u to be described later are inserted into the slots 18u and 20u. A v-phase first stator coil 22v and a second stator coil 24v to be described later are inserted into the slots 18v and 20v, and a w-phase first stator coil 22w and a second stator coil 24w to be described later are inserted into the slots 18v and 20v. Is inserted. As a result, as shown in FIG. 2A, the first stator coils 22u, 22v, 22w and the second stator coils 24u, 24v, 24w are alternately arranged in the circumferential direction of the stator core 12. In FIG. 1 and FIG. 2 (A), U1, V1, and W1 are attached in the vicinity of the first stator coils 22u, 22v, and 22w, and U2, V2, and W2 are in the vicinity of the second stator coils 24u, 24v, and 24w. The code | symbol is attached | subjected.

  Each of the stator coils 22u, 22v, 22w, 24u, 24v, 24w has a plurality of conductor segments 26, 28 at one coil end E1 provided outside the one axial end surface (upper end surface in FIG. 2) of the stator core 12. Are joined by welding at joints C1, C2.

  In FIG. 2B, the joints C1 and C2 are schematically indicated by ellipses. 2A and 2B, the u-phase first stator coil 22u is indicated by sand, and the u-phase second stator coil 24u is indicated by a diagonal lattice.

  The first stator coils 22u, 22v, 22w and the second stator coils 24u, 24v, 24w make the radial positions of the joint portions C1, C2 of the conductor segments 26, 28 different from each other. For this reason, the coil end height H1 (FIG. 2A), which is the axial length of the coil ends E1 of the stator coils 22u, 22v, 22w, 24u, 24v, and 24w, can be reduced. This will be described in detail later. Note that the stator core 12 may be formed of a powder core formed by pressure-molding magnetic powder.

  The connected stator coils 14u, 14v, and 14w of each phase are formed by connecting a plurality of first stator coils 22u in an annular shape in the circumferential direction, as representatively shown by the u-phase connected stator coil 14u in FIG. The formed first half annular portion 30 and the second half annular portion 32 formed by connecting the plurality of second stator coils 24u in an annular shape are electrically connected in series. The u-phase first half annular portion 30 and the second half annular portion 32 are wound around a plurality of locations in the circumferential direction of the stator core 12 while being inserted into adjacent slots 18u, 20u. The connected stator coils 14v and 14w are formed in the same manner as the connected stator coil 14u only by disposing the arrangement position in the circumferential direction.

  FIG. 4 shows the first half annular portion 30 of the u phase. Each of the first stator coils 22u forming the first half annular portion 30 is arranged such that a plurality of the first conductor segments 26 shown in FIG. Each tip is formed by joining.

  Each of the first conductor segments 26 is configured by bending a conductor wire, which is a rectangular wire having an insulating coating 89 and a rectangular cross-sectional shape, into a predetermined shape. The first conductor segment 26 has a substantially parallel I-shaped first leg 36 and a second leg 38 and is formed in a substantially U shape as a whole. The detailed shape of the first conductor segment 26 will be described later.

  Returning to FIG. 4, the plurality of first stator coils 22 u are divided into two first slots 18 u (FIG. 3) that are separated by a predetermined distance d <b> 1 across the plurality of slots along the circumferential direction of the stator core 12 (FIG. 3). It is wound around the stator core 12 so as to be inserted. In this case, when the current flows in one direction, the first stator coil 22u wound so that the coil current flows in one direction (α direction in FIG. 4) and the coil in the other direction (β direction in FIG. 4). The first stator coils 22v wound so that a current flows are alternately arranged in the circumferential direction and connected to each other.

  As shown in FIG. 5, each of the first conductor segments 26 includes an I-shaped first leg 36 and a second leg 38 that are substantially parallel to each other before being inserted into the first slot 18 u of the stator core 12, and the first leg. 36 and the 1st connection part 40 which connects the other end (lower end of FIG. 5) on the opposite side to the junction part of the 2nd leg 38. FIG. An exposed portion 41 in which the conductor wire is exposed from the insulating coating is formed at one end portion (the upper end portion in FIG. 5) of the first leg 36 and the second leg 38.

  The first connecting portion 40 includes two radial direction changing portions 42, 44, a first inner diameter side element 46 and a first outer diameter side element 48, and a first connecting body 50.

  The radial direction change portions 42 and 44 are provided in a direction orthogonal to the length direction of the legs 36 and 38 so as to extend along the radial direction of the stator core 12 from the other end of the first leg 36 and the second leg 38. The first inner diameter side element 46 and the first outer diameter side element 48 are connected to each of the radial direction changing portions 42 and 44 and are arranged in the length direction of the first leg 36 or the second leg 38 so as to approach each other in the circumferential direction. It is provided in a direction that is inclined with respect to. As shown in FIG. 9 to be described later, when the first inner diameter side element 46 and the first outer diameter side element 48 are viewed in the AA cross section of FIG. 6 to be described later, the first inner diameter side element 46 and the first outer diameter. The side element 48 is formed in an arc shape. The first inner diameter side element 46 is provided at a predetermined radial position, and the first outer diameter side element 48 is provided radially outside the first inner diameter side element 46. The first connection main body 50 connects the first inner diameter side element 46 and the first outer diameter side element 48 and is formed to be inclined with respect to the circumferential direction. As shown in FIG. 5, the first leg 36 and the second leg 38 are provided in a range indicated by arrows R1 and R2 in FIG. 5, and the first slot insertion portion 52 and the second slot inserted into the first slot 18u. An insertion portion 53 is provided.

  By using a rectangular wire for the first conductor segment 26, the space factor of the conductor wire in the slot 18u can be improved.

  The first conductor segment 26 is formed by bending a portion that protrudes outward from one axial end of the stator core 12 after being inserted into the first slot 18u. Specifically, as shown in FIG. 6, the first slot insertion portion 52 of the first leg 36 and the second slot insertion portion 53 of the second leg 38 are two first spaced apart in the circumferential direction of the stator core 12. The stator core 12 is inserted into the slot 18u from the other axial end side (lower side in FIG. 6). In each of the first stator coils 22u, the second slot insertion portion 53 is inserted into a first slot 18u different from the first slot insertion portion 52. After the insertion of the first slot insertion portion 52 and the second slot insertion portion 53, the first radial direction changing portion 54, the inclined portion 56 that is the first circumferential arrangement portion and the axial direction portion 58 are formed on the distal end side of the first leg 36. And a second radial direction change portion 55 (FIG. 7), an inclined portion 57 (FIG. 7) as a second circumferential arrangement portion, and an axial portion 58 are formed on the distal end side of the second leg 38. The

  The radial direction change portions 54, 55 are connected to one end of the slot insertion portions 52, 53 and are extended radially outward along one axial end surface of the stator core 12. The inclined portions 56 and 57 are connected to one end in the radial direction of the radial direction changing portions 54 and 55 and are inclined with respect to the axial direction. As shown in FIG. 7, when FIG. 6 is viewed from above, the inclined portions 56 and 57 are formed in an arc shape. The inclined portion 56 is disposed in the circumferential direction of the first radial position S1, and the inclined portion 57 is disposed in the circumferential direction of the second radial position S2. The first and second circumferentially arranged portions are not inclined with respect to the axial direction, and may be curved when viewed in FIG. The axial portion 58 is formed to extend along the axial direction on the tip side of the inclined portions 56 and 57, and forms a first joint C1 described later. The axial portion 58 includes the exposed portion 41.

  The radial direction change parts 54 and 55, the inclination parts 56 and 57, and the axial direction part 58 are formed as follows. First, in the first leg 36 and the second leg 38 of the first conductor segment 26, the part located in the vicinity of the opening of the slot 18 u out of the part protruding outward from one axial end of the stator core 12 is radially outward. By being bent, the radial direction change portions 54 and 55 are formed. Next, in the first leg 36 and the second leg 38, the distal end side of the radial direction change portions 54 and 55 is bent obliquely with respect to the axial direction so as to approach each other on the outer side of the slot 18u. Inclined portions 56 and 57 are formed. Next, in the first leg 36 and the second leg 38, the distal end side of the inclined portions 56 and 57 is bent along the axial direction, whereby the axial direction portion 58 is formed.

  In the two first conductor segments 26 provided at different positions in the radial direction, the first leg 36 and the second leg 38 are joined by the first joint C1, and the plurality of first conductor segments 26 are electrically connected sequentially. Is done. Specifically, it is disposed radially outside the axial portion 58 of the second leg 38 of the first conductor segment 26 indicated by P1 in FIG. 6 and the first conductor segment 26 of P1, and indicated by P2 in FIG. The axial direction part 58 of the 1st leg 36 of the 1st conductor segment 26 is piled up mutually, and it joins by welding, and forms the 1st junction part C1. By repeating this operation with the plurality of first conductor segments 26 having different radial positions, the plurality of first conductor segments 26 are electrically connected in series to form the first stator coil 22u. .

  Note that the bending work of the plurality of first conductor segments 26 in the one-side coil end E1 may be performed simultaneously. The joining order of the plurality of first conductor segments 26 is not limited to one order, and the plurality of joining portions C1 may be joined at the same time.

  As shown in FIGS. 8 and 9, in the other side coil end E2 provided at the end opposite to the joint portion C1 of the first stator coil 22u, the first connecting portions 40 of the plurality of first conductor segments 26 are , And protrudes outward from the other axial end of the stator core (lower end in FIG. 8). The first outer diameter side element 48 is disposed on the radially outer side than the first inner diameter side element 46.

  The front half annular portion 30 is formed by connecting a plurality of first stator coils 22u in an annular shape. In this case, a first conductor segment 26 disposed at the radially inner end (or radially outer end) of the first stator coil 22u and another first stator coil 22u adjacent in the circumferential direction of the first stator coil 22u. The first conductor segment 26 disposed at the radially inner end (or radially outer end) is joined at the joint portion C1 at the one-side coil end E1.

  Further, the first legs 36 of the first stator coils 22u adjacent in the circumferential direction are inserted into the same first slot 18u. Further, at the time of insertion, the first legs 36 of the two first stator coils 22u are arranged adjacent to each other in the radial direction in the first slot 18u. Similarly, the second leg 38 of the first stator coil 22u adjacent in the circumferential direction is inserted into a first slot 18u different from the first slot 18u into which the first leg 36 is inserted. The second legs 38 of the first stator coil 22u are arranged adjacent to each other in the radial direction in the first slot 18u.

  The second half annular portion 32 shown in FIG. 3 is also formed in the same manner as the first half annular portion 30, but the second stator coil 24u forming the second half annular portion 32 is a first slot 18u into which the first stator coil 22u is inserted. On the other hand, it is inserted into the second slot 20u adjacent in the circumferential direction.

  The second stator coil 24u includes a plurality of second conductor segments 28 (FIG. 10) provided at one side coil end E1 at a position radially different from each of the plurality of first joint portions C1. It is formed by joining at the joint C2 by welding.

  FIG. 10 shows the state before the second conductor segment 28 forming the second stator coil 24u is inserted into the slot. The second conductor segment 28 has substantially the same shape as the first conductor segment 26, but unlike the first conductor segment 26, the radial direction between the legs 62, 64 and the inner diameter side element 70 and the outer diameter side element 72. Does not include changes. The second conductor segment 28 includes a third leg 62 and a fourth leg 64 that are inserted into two second slots 20 u that are separated in the circumferential direction, and a second connecting portion 66 that connects the third leg 62 and the fourth leg 64. And have. The third leg 62 and the fourth leg 64 are provided in a range indicated by arrows R3 and R4 in FIG. 10, and have a third slot insertion part 68 and a fourth slot insertion part 69 inserted into the second slot 20u.

  The second connecting portion 66 is connected in a direction inclined with respect to the length direction of the fourth leg 64 and a second inner diameter side element 70 connected in a direction inclined with respect to the length direction of the third leg 62. It has the 2 outer diameter side element 72 and the 2nd connection main body 74. FIG. In a state where the third slot insertion portion 68 and the fourth slot insertion portion 69 are inserted into the second slot 20u, the second inner diameter side element 70 is provided at a predetermined radial direction position, and the second outer diameter side element 72 is It is provided radially outside the inner diameter side element 70. The second connection main body 74 is formed to be inclined with respect to the circumferential direction so as to connect one end of the second inner diameter side element 70 and the second outer diameter side element 72.

  The third leg 62 and the fourth leg 64 are inserted into two second slots 20 u that are circumferentially separated from the other axial side of the stator core 12, and protrude outward from one axial end of the stator core 12.

  The second stator coil 24u is formed by electrically connecting a plurality of second conductor segments 28 sequentially. Specifically, as shown in FIG. 6 again, the third slot insertion portion 68 of the third leg 62 and the fourth slot insertion portion 69 of the fourth leg 64 are separated from each other in two circumferential directions of the stator core 12. The stator slot 12 is inserted into the second slot 20u from the other axial end side. In each of the second stator coils 24u, the fourth slot insertion portion 69 is inserted into a second slot 20u different from the third slot insertion portion 68. The third slot insertion portion 68 is inserted into the second slot 20u at the same radial position as one first slot insertion portion of the first stator coil 22u. After the insertion of the third slot insertion portion 68 and the fourth slot insertion portion 69, the third radial direction change portion 76, the inclined portion 78 that is the third circumferential direction arrangement portion, and the axial direction portion 80 are formed on the distal end side of the third leg 62. And a fourth radial direction changing portion 77 (FIG. 7), an inclined portion 79 (FIG. 7) which is a fourth circumferential direction arrangement portion, and an axial portion 80 are formed on the distal end side of the fourth leg 64. The The radially changing portions 76 and 77 are connected to one end of the slot inserting portions 68 and 69 and are extended radially outward along one axial end surface of the stator core 12. The radial length of the third radial direction changing portion 76 is smaller than the radial length of the first radial direction changing portion 54 of the first conductor segment 26, and the radial length of the fourth radial direction changing portion 77 is This is smaller than the radial length of the second radial direction changing portion 55 of the one conductor segment 26. The third radial direction change portion 76 and the fourth radial direction change portion 77 may be omitted.

  The inclined portions 78 and 79 are connected to one end in the radial direction of the radial direction changing portions 76 and 77 and are inclined with respect to the axial direction. As shown in FIG. 7, when FIG. 6 is viewed from the top to the bottom, the inclined portions 78 and 79 are formed in an arc shape. The inclined portion 78 is arranged in the circumferential direction of the third radial position S3, and the inclined portion 79 is arranged in the circumferential direction of the fourth radial position S4. The first radial position S1, the second radial position S2, the third radial position S3, and the fourth radial position S4 are different from each other, and the intervals between the radial positions are inclined portions 56, 28 of the conductor segments 26, 28, respectively. The thickness in the radial direction (vertical direction in FIG. 2B) of 57, 78, 79 is substantially the same as or larger than that. In the radial direction, as shown in FIG. 2, the third radial position S3, the fourth radial position S4, the first radial position S1, and the second radial position S2 are in this order on the outer diameter side. The third and fourth circumferentially arranged portions are not inclined with respect to the axial direction, and may be curved when viewed in FIG. The axial portion 80 is formed to extend along the axial direction on the distal end side of the inclined portion 78 to form the second joint portion C2.

  The radial direction changing portions 76 and 77, the inclined portions 78 and 79, and the axial direction portion 80 are the same method as the radial direction changing portions 54 and 55, the inclined portions 56 and 57, and the axial direction portion 58 of the first conductor segment 26. Formed with. In the two second conductor segments 28 provided at different positions in the radial direction, the third leg 62 and the fourth leg 64 are joined at the second joint C2, and the plurality of second conductor segments 28 are connected. Specifically, the axial direction part 80 of the 4th leg 64 of the 2nd conductor segment 28 shown by Q1 in FIG. 6 and the 2nd conductor segment 28 arrange | positioned radially outside the 2nd conductor segment 28 of Q1. The axial direction part 80 of the 3rd leg 62 is piled up mutually, and it joins by welding, and the 2nd junction part C2 is formed. The second joint C2 is provided at a position that is different from the first joint C1 of the first stator coil 22u in the radial direction. By repeating this operation with the plurality of second conductor segments 28 having different radial positions, the plurality of second conductor segments 28 are electrically connected in series by being connected in series to form the second stator coil 24u. .

  As shown in FIG. 2A, in the first stator coil 22u and the second stator coil 24u, the inclined portions 56 and 78 inclined in the same direction with respect to the axial direction are viewed from one side in the radial direction to the other side. At least partially overlap each other. As a result, as will be described later, the axial height H1 of the one-side coil end E1 can be reduced.

    On the other hand, as shown in FIGS. 8 and 9, in the other coil end E <b> 2, the second connecting portions 66 of the plurality of second conductor segments 28 protrude outward from the other axial end of the stator core 12. The second outer diameter side element 72 is disposed on the radially outer side of the second inner diameter side element 70. Furthermore, the 2nd connection main body 74 is provided in the position which differs in a radial direction with respect to the 1st connection main body 50 of the 1st stator coil 22u. As shown in FIG. 8, the second inner diameter side element 70 overlaps at least a part of the first inner diameter side element 46 when viewed from one side in the radial direction to the other side, and the second outer diameter side element 72 is When viewed from one side in the radial direction to the other side, it overlaps at least a part of the first outer diameter side element 48. As a result, the axial height G1 of the other coil end E2 can be reduced as will be described later.

  The first stator coil 22u located at one end in the circumferential direction of the front half annular portion 30 and located at the end opposite to the power source connection side, and the one end in the circumferential direction of the second half annular portion 32, and a neutral point ( The second stator coil 24u located at the end opposite to the other end (not shown) is joined at the joined portion of the one-side coil end E1 to form a u-phase coupled stator coil 14u. The neutral point is a connection point of the three-phase linked stator coils 14u, 14v, 14w.

  At the end portion of the first stator coil 22u located at the power connection side end portion of the front half annular portion 30, the end portion is bent to be led out to the outside in the axial direction of the stator core 12, thereby connecting the end portion 84 (FIG. 3). ) Is provided. A power line (not shown) is connected to the connection end 84, and the power line is connected to an inverter (not shown) provided on the power supply side.

  Although the case where the u-phase coupled stator coil 14u is formed has been described above, the v-phase and w-phase coupled stator coils 14v and 14w shown in FIG. 1 are also formed in the same manner. The end portions of the three second stator coils 24u, 24v, 24w located at the neutral point side end portions of the second-half annular portion 32 of the connection stator coils 14u, 14v, 14w of each phase are mutually outside in the axial direction of the stator core 12. Connected. As a result, the plurality of stator coils 22u, 22v, 22w, 24u, 24v, 24w are wound around the stator core 12 in a distributed manner along the circumferential direction.

  The first stator coils 22u, 22v, 22w and the second stator coils 24u, 24v, 24w are alternately arranged in the circumferential direction of the stator core 12. In this case, the u-phase, v-phase, and w-phase first stator coils 22u, 22v, and 22w include a plurality of first joint portions C1 provided on concentric circles at the same position in the radial direction at the one-side coil end E1. The other coil end E2 includes a plurality of first coupling bodies 50 provided on concentric circles at the same position in the radial direction. The u-phase, v-phase, and w-phase second stator coils 24u, 24v, and 24w include a plurality of second joints C2 provided on concentric circles at the same position in the radial direction in the one-side coil end E1. The other coil end E2 includes a plurality of second connection bodies 74 provided on concentric circles at the same position in the radial direction. Accordingly, the first joint portions C1 and the second joint portions C2 having different radial positions are alternately arranged in the circumferential direction, and the first connection main body 50 and the second connection main body 74 having different radial positions are arranged in the circumferential direction. Alternatingly arranged.

  Further, the radial lengths of the coil ends E <b> 1 and E <b> 2 are smaller than the radial length of the stator core 12. For this reason, the radial length of the stator 10 is not affected by the radial lengths of the coil ends E1, E2.

  According to the stator 10, the first joint portion C1 of the first stator coils 22u, 22v, and 22w and the slot into which the first stator coils 22u, 22v, and 22w are inserted are inserted in slots that are adjacent in the circumferential direction. The second stator coils 24u, 24v, 24w and the second joints C2 are arranged differently in the radial direction. For this reason, in the one side coil end E1, the stator coils adjacent in the circumferential direction are not arranged in the axial direction, and the coil end height H1 (FIG. 2), which is the axial length of the one side coil end E1, can be reduced. Therefore, the axial length of the stator 10 can be reduced. In this case, the length in the radial direction of the coil end E1 is increased by the difference in the radial position between the first joint C1 and the second joint C2, but the coil end E1 is smaller than the radial length of the stator core 12. An increase in the radial length of the stator does not affect the radial length of the stator 10. As a result, the size of the stator 10 and the rotating electrical machine including the stator 10 can be reduced.

  FIG. 11 shows a state where the coil end height H1 of the one-side coil end E1 of the present embodiment is compared with the coil end height H2 of the comparative example. As shown in FIG. 12, in the stator 10 of the present embodiment, the comparative example is the first stator coils 22u, 22v, 22w and the second stator coils 24u, 24v, 24w inserted into the adjacent slots 18, 20, The joint portions C1 and C2 of the conductor segment 86 are provided on the same circumference at the same position in the radial direction. For this reason, as shown in FIG. 11A, in the comparative example, in the stator coils adjacent in the circumferential direction, the inclined portion 88 provided at the coil end E1 and inclined with respect to the axial direction is in the axial direction (γ1 direction). Many are lined up along. In FIG. 11, when considering four stator coils 22u, 24u, 22v, and 24v arranged in the circumferential direction in the comparative example, four conductor segments 86 are arranged along the γ1 direction. This increases the axial height H2 of the coil end E1. Further, when the width of the conductor segment 86 forming the stator coil increases, the axial height H2 further increases.

  On the other hand, in the present embodiment, since the first joint C1 and the second joint C2 are provided at different positions in the radial direction, the axial direction of the inclined portions 56 and 78 at the coil end E1 as shown in FIG. The number arranged along (γ2 direction) decreases. In FIG. 11, when the four stator coils 22u, 24u, 22v, and 24v arranged in the circumferential direction in the present invention are considered, the number of conductor segments 28 (or 26) arranged in the γ2 direction is two. For this reason, coil end height H1 can be made small. Even when the coil widths of the conductor segments 26 and 28 are increased, the coil end height H1 can be prevented from becoming excessively large.

  Further, as shown in FIGS. 7 and 8, in the other side coil end E <b> 2, the second connection main body 74 is provided at a position different from the first connection main body 50 in the radial direction. For this reason, in the other side coil end E2, the inner diameter side elements 46, 70 and the outer diameter side elements 48, 72 of the stator coils 22u, 22v, 22w, 24u, 24v, 24w adjacent in the circumferential direction are arranged in the axial direction. The coil end height G1 (FIG. 8), which is the axial length of the other side coil end E2, can be reduced. Accordingly, the axial length of the stator 10 can be further reduced. In addition, the connection main bodies 50 and 74 are not limited to the case of having a shape inclined with respect to the circumferential direction, but may be a shape extending in the radial direction or a crank shape.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment, Of course, in the range which does not deviate from the summary of this invention, it can implement with a various form. . For example, each of the connected stator coils 14u, 14v, 14w of each phase may be formed by only one annular portion in which a plurality of stator coils are connected in an annular shape. In this case, the first stator coil having the first joint C1 and the second stator coil having the second joint C2 having a radial position different from the first joint C1 are alternately arranged in the circumferential direction of the stator core 12. To place.

  Further, the shape of the conductor segment is not limited to the shape shown in FIGS. 5 and 10. For example, the shape of the other side connecting portion that connects two legs may be a simple U-shape.

  10 stator, 12 stator core, 14u, 14v, 14w connected stator coil, 16 salient pole, 18u, 18v, 18w first slot, 20u, 20v, 20w second slot, 22u, 22v, 22w first stator coil, 24u, 24v 24w 2nd stator coil, 26 1st conductor segment, 28 2nd conductor segment, 30 1st half annular part, 32 2nd half annular part, 36 1st leg, 38 2nd leg, 40 1st connecting part, 41 exposed part, 42 , 44 Radial direction change part 46 1st inner diameter side element, 48 1st outer diameter side element, 50 1st connection main body, 52 1st slot insertion part, 53 2nd slot insertion part, 54 1st radial direction change part, 55 2nd radial direction change part, 56,57 inclination part, 58 axial direction part, 60 1st side 1st connection part, 62 3rd leg, 64 4th leg, 6 Second connecting portion, 68 Third slot inserting portion, 69 Fourth slot inserting portion, 70 Second inner diameter side element, 72 Second outer diameter side element, 74 Second connecting body, 76 Third radial direction changing portion, 77 4 radial direction changing portion, 78, 79 inclined portion, 80 axial direction portion, 82 one side second connecting portion, 84 connecting end portion, 86 conductor segment, 88 inclined portion, 89 insulating coating.

Claims (4)

A stator core having a plurality of slots;
A plurality of conductor segments inserted into the plurality of slots are joined by joints outside the one end surface in the axial direction of the stator core, and a plurality of conductor segments are wound around the stator core in a distributed manner. A rotating electrical machine stator comprising: a plurality of stator coils, wherein the joint portions of the stator coils inserted into the slots adjacent to each other in the circumferential direction are arranged differently in the radial direction. The rotating electrical machine stator according to claim 1,
The plurality of conductor segments include a plurality of first conductor segments and a plurality of second conductor segments,
The plurality of stator coils are formed by joining the plurality of first conductor segments at the first joint of the joints, and are inserted into the first slot of the plurality of slots. And a second slot inserted into a second slot adjacent to the first slot among the plurality of slots, and formed by joining the plurality of second conductor segments at a second joint of the joints. Including a stator coil,
The first stator coil is connected to the first slot insertion portion and the first slot insertion portion to be inserted into the first slot, and is radially extended outside the one axial end of the stator core. A first radial direction changing portion, a first circumferential direction positioning portion connected to a radial end of the first radial direction changing portion and arranged in the circumferential direction of the first radial direction position; and the first circumferential direction positioning portion; A second circumferentially arranged portion that is joined via the first joined portion and arranged in the circumferential direction of the second radial position; and a second circumferentially arranged portion that is connected to the second circumferentially arranged portion and inserted into another first slot. Including a two-slot insertion portion,
The second stator coil is connected to the third slot insertion portion, a third slot insertion portion to be inserted into the second slot at the same radial position as the first slot insertion portion, and a shaft of the stator core. A third circumferential arrangement portion arranged in the circumferential direction of the third radial position outside the one end in the direction, and a fourth radial position joined via the third circumferential arrangement portion and the second joint portion. A rotating electrical machine stator including a fourth circumferential arrangement portion arranged in the circumferential direction of the first and a fourth slot insertion portion connected to the fourth circumferential arrangement portion and inserted into another second slot. The rotating electrical machine stator according to claim 1,
The plurality of conductor segments are inserted into two first slots among the plurality of slots from the other axial side of the stator core, and a first leg and a second leg projecting outward from one axial end of the stator core. A first conductor segment having a leg, and inserted into two second slots adjacent to each first slot among the plurality of slots from the other axial side of the stator core, than one axial end of the stator core A second conductor segment having a third leg and a fourth leg projecting outward,
The plurality of stator coils are
In the two first conductor segments provided at different positions in the radial direction, one of the first legs and the other second leg are formed by being joined at the first joint of the joints. One stator coil;
In the two second conductor segments provided at different positions in the radial direction, one of the third legs and the other fourth leg of the joints is different in the radial position from the first joint. A rotating electrical machine stator including a second stator coil formed by joining at two joints. In the rotating electrical machine stator according to claim 2 or claim 3,
One of the first conductor segments is a first connecting portion that connects the first leg and the second leg outside the other axial end of the stator core, and has a first inner diameter provided at a predetermined radial position. A first element having a side element, a first outer diameter side element provided radially outside the predetermined radial position, and a first connection body for connecting the first inner diameter side element and the first outer diameter side element. Including one connecting part,
One of the second conductor segments is a second connecting portion that connects the third leg and the fourth leg outside the other axial end of the stator core, and is provided at a second predetermined radial position. A second inner diameter side element, a second outer diameter side element provided radially outside the second predetermined radial position, the second inner diameter side element and the second outer diameter side element, and the first A rotating electrical machine stator including a second coupling portion having a coupling body and a second coupling body arranged differently in the radial direction.

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