JP2009044901A - Stator coil winding method of rotary electric machine, and the rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator coil winding method of a rotary electric machine, by which the stator coil of a shape developed in the circumferential direction is readily around each slot of the inner rotor type stator core. <P>SOLUTION: Skew is formed at the slot 91, and then a formed conductor wire 100 is pushed into an inside of a radial direction of the stator core 9, in the same direction as the skewing slot 91. After that, a slot-holding portion 13 of the formed conductor wire 100 is energized to the outside in the radial direction to push into the slot 91. This work is performed, in the order starting from one end side of the formed conductor wire 100 to each slot-holding portion 13 of the formed conductor wire 100, by which the stator coil 10 comprising the formed conductor wire 100 is wound around the stator core 9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stator coil winding method for a rotating electrical machine and a rotating electrical machine manufactured thereby, and more particularly to an improvement of a stator coil winding method for a rotating electrical machine using a continuous conductor wire made of a flat wire.

  In order to improve the slot space factor, it is advantageous to configure the stator coil with a rectangular wire conductor, that is, a conductor wire having a rectangular cross section. However, since the rectangular wire conductor has a larger cross-sectional area and is difficult to deform than a normal round wire with a small cross-sectional area, there is a problem that it is difficult to wind the stator core even if an open slot structure is adopted. .

  In order to improve this problem, a U-shaped segment conductor made of a flat wire conductor for one turn is inserted into the slot in the axial direction, and then the tips of the U-shaped segment conductors adjacent to each other are welded to produce a stator coil. The technology (SC stator coil structure) has been put into practical use by the present applicant.

  In addition, a stator coil having a circumferentially expanded shape (also referred to as a folded stator coil) having a shape in which the stator coil is developed in the circumferential direction by sequentially folding flat wire conductors corresponding to the number of phases parallel to each other is created. It is proposed in the following Patent Documents 1 to 3 to push the screw into the stator core.

  Patent Document 3 filed by the present applicant discloses a U-shaped conductor having a pair of long legs parallel to each other by a distance corresponding to an electrical angle π (one magnetic pole pitch) (hereinafter also referred to as a long U-shaped segment). Is shifted by one magnetic pole pitch from the U-shaped head side in a predetermined position in a direction perpendicular to the leg extending direction (axial direction when the stator core is mounted) (circumferential or tangential direction when the stator core is mounted). By sequentially performing the process of folding back in the leg extending direction, a deployment coil having a shape in which a single-phase wave winding (also referred to as a wave winding) is developed is formed into a cylindrical shape. Rolled to form a wound phase winding, and arranged a number of required number of winding phase windings in the circumferential direction shifted by a predetermined pitch equal to the interphase electrical angle to form a cylindrical multiphase stator coil This multi-phase stator coil Technical pushed from the opening of each slot opening into inwardly (also referred to as slot openings) in each slot has proposed (hereinafter, also referred to as folded stator coil). Note that the above-described folding in the axial direction is not folded in a folded shape, but is folded so as to be wound around a plate.

More specifically, one turn of the stator coil is a pair of slot conductor portions that are accommodated in a predetermined conductor accommodating position (also referred to as “layer” in this specification) in the radial direction in the slot and separated from each other by approximately one magnetic pole pitch. And a pair of crossing portions that connect a pair of slot conductor portions separated by approximately one magnetic pole pitch from each other outside the slot. This folded stator coil has a single cross-layer cross section in which slot conductor portions at equal radial positions (referred to as the same layer) of two slots spaced apart corresponding to the magnetic pole pitch of the NS pole of the rotor are connected in series. And a crossover portion (also referred to as a crossover portion of different layers) in which slot conductor portions at different positions (referred to as different layers) in the radial direction of two slots spaced apart corresponding to the magnetic pole pitch of the NS pole of the rotor are connected in series. These transition portions form coil ends on both axial sides of the stator core.
Japanese Patent No. 3476416 US6930426 JP 2004-88993 A

  However, the above-described SC-type stator coil structure has a problem that the manufacturing process is complicated because a large number of welding points are generated. The folded stator coil (circumferentially deployed shape stator coil) is easy to bend the stator coil, but the deformability of the circumferentially expanded stator coil is poor even if it uses a flat wire conductor. Since it is further lowered by the bending process, there is a problem that slot insertion becomes more difficult.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a stator coil winding method for a rotating electrical machine excellent in workability and a rotating electrical machine manufactured thereby.

  The present invention that solves the above-described problems is a method of winding a stator coil of a rotating electrical machine, in which distributed stator coils are wound around a cylindrical stator core in which slots of an open slot structure are formed on the inner peripheral surface at a predetermined pitch in the circumferential direction. A skew structure is formed in the stator core in which the first opening on one axial side of the slot is shifted by a predetermined slot pitch to the one circumferential side relative to the second opening on the other axial side, and the slot is accommodated in the conductor wire. Forming the formed conductor wire in advance by alternately forming the portion and the coil end portion, inserting the formed conductor wire into the radial inner side of the stator core from the first opening side, and moving the molded conductor wire outward in the radial direction; The step of inserting the slot accommodating portion of the molded conductor wire into the slot is performed sequentially from one end side of the molded conductor wire.

  That is, in this invention, the molded conductor wire is inserted from the one end side obliquely inward in the radial direction of the stator core in accordance with the skew of the slot, and then each slot accommodating portion of the molded conductor wire is inserted from the one end side in the radial direction. The stator coil winding work can be performed because the deformation of the stator core can be reduced when the slot accommodating portion of the formed conductor wire is pushed inward in the radial direction of the stator core since the slots are sequentially urged outward and inserted into the slots sequentially. Will be much easier. That is, according to the present invention, when the formed conductor wire set on the first opening side of the slot is sequentially inserted into the stator core from one circumferential side to the other side of the stator core, the stator core slot has the first opening on the one axial side. Further, since the second opening on the other side in the axial direction is shifted to the one side in the circumferential direction, the bending at the time of inserting the formed conductor wire can be reduced accordingly.

  In a preferred embodiment, the circumferentially developed stator coil is prepared in advance by alternately forming slot accommodating portions and coil end portions on the molded conductor wires corresponding to at least the number of phases, and the circumferentially developed stator. Inserting the slot accommodating portion of the stator coil having the circumferentially expanded shape into the slot by inserting the coil from the first opening side inward in the radial direction of the stator core and moving the coil outward in the radial direction; It implements sequentially from the one end side of the stator coil of an expansion | deployment shape.

  That is, according to this aspect, a circumferentially developed stator coil that has been manufactured in advance and has increased bending rigidity can be easily inserted sequentially into each slot of the stator core for the same reason as described above.

  In a preferred aspect, the molded conductor wire is a flat wire having a width substantially equal to the circumferential width of the slot. Thereby, the slot space factor can be further improved.

  In a preferred aspect, the first opening of the slot has a skew shifted in the circumferential direction in a range of 2 slot pitch or more and 1 magnetic pole pitch or less with respect to the second opening. Thereby, the stator coil winding operation can be greatly facilitated as compared with the case where the skew is not formed while preventing the output from being reduced due to excessive skew.

Preferred embodiments for carrying out the invention

  Hereinafter, preferred embodiments of the present invention will be described. However, the present invention should not be construed as being limited to the following embodiments, and the technical idea of the present invention may be realized by combining other techniques.

(overall structure)
The overall configuration will be described.

  FIG. 1 is a longitudinal sectional view showing an automotive alternator around which a stator coil according to an embodiment of the present invention is wound. This vehicle alternator is rotatably supported by bearings 3 and 4 on pulley-side frame 1 and anti-pulley side frame 2, which are bowl-shaped end frames, and pulley-side frame 1 and anti-pulley side frame 2. A rotating shaft 5, a pulley 6 fixed to the tip of the rotating shaft 5 protruding from the pulley-side frame 1, a Landel-type rotor (rotor) 7 fixed to the rotating shaft 5, and a position surrounding the rotor 7 And a stator (stator) 8 sandwiched between the pulley side frame 1 and the non-pulley side frame 2.

  The stator 8 includes a cylindrical stator core (stator core) 9 and a stator winding (stator coil) 10 wound around the stator core 9 as will be described later. The stator winding 10 includes a first coil end 11 that protrudes from the stator core 9 toward the pulley 6 and a second coil end 12 that protrudes from the stator core 9 toward the non-pulley side.

  Since the vehicular AC generator having this type of Randel-type rotor 7 is widely known to those skilled in the art, further description of the structure and operation will be omitted.

(Stator 8)
The stator 8 will be described in more detail with reference to FIG.

  The stator core 9 has two slots for each pole and each phase, and the stator winding 10 is composed of two sets of three-phase wave windings. The stator winding 10 is constituted by a plurality of phase windings having the same number of phases.

  FIG. 2 is a side view of the stator 8 for showing a spatial arrangement of one phase winding of the stator winding 10. One phase winding consists of two partial coils that are sequentially wave wound (may be lap winding) in two in-phase slots that are separated by an electrical angle of π from each other, connected in series by a cross-conductor portion that forms the same-level crossover portion. Has been.

  In this embodiment, the stator core 9 has two slots 91 for each pole and each phase, and the number of magnetic poles of the rotor 7 is 16. Therefore, the total number of slots 91 is 96. Each phase winding is constituted by a copper wire (continuous conductor wire) having a rectangular cross section, usually called a flat wire, covered with an insulating film. The phase winding returns from the slot 91 and then returns to the next slot 91 separated by an electrical angle π. The method of forming and arranging the phase winding itself can be essentially the same as the method of Patent Document 1 filed by the applicant of the present application, so refer to Patent Document 1 if necessary.

(Phase winding)
One phase winding of the stator winding 10 will be described in more detail with reference to FIG.

  The phase winding is accommodated in the slot 91 of the stator core 9 via an insulator. In FIG. 2, only one phase winding is shown. Each of the phase windings is divided into four conductor accommodating positions (also referred to as hierarchies) that are sequentially arranged in the radial direction in the slot 91, and one magnetic pole pitch (6 slot pitch). ) A winding band comprising a crossover conductor portion (different-layer crossover portion referred to in the present invention) 14 that connects the ends on the same axial direction side of the pair of slot accommodating portions 13 accommodated in two separated slots 91, 91. And a same-layer crossover portion 15 composed of a crossover conductor portion that connects a pair of end portions of the same phase among the end portions of each conductor wire constituting the end portion of the winding band. Therefore, the same level crossover portion 15 is configured by six crossover conductor portions that are half the number of the total of twelve conductor wires that are arranged in parallel with each other and form the winding band.

  The phase winding also has a pair of phase terminals 16 and 17 constituted by both ends of one end side of two continuous lines that are separated from each other by an electrical angle π of a winding band (a circumferentially developed stator coil). . Note that both end portions on the other end side of two continuous lines separated from each other by an electrical angle π of the winding band are connected by the same level crossover portion (crossover conductor portion) 15. In this embodiment, the phase terminal 16 forms an output lead line as a phase output terminal, and the phase terminal 17 is connected to a neutral point in this embodiment. The pair of phase terminals 16 and 17 are arranged on the outermost layer with a pitch of 6 slots. A pair of black circles indicates a folded connection portion 18 described later.

(Slot housing part 13)
The slot accommodating portion 13 will be described.

  One phase winding shown in FIG. 2 is composed of 16 slots × 4 layers = 64 slot accommodating portions 13 and 62 different level crossing portions 14 alternately connected in series with these slot conductor portions. Two continuous lines forming a part of the winding band, and one transition conductor part 15 forming a part of the same-level transition part by connecting the radially inner ends of the two continuous lines. More specifically, the phase winding includes a first continuous line portion formed by connecting the first slot accommodating portion 13-1 to the thirty-second slot accommodating portion 13-32 by a crossover portion 14 forming a different level crossover portion. A second continuous line portion formed by connecting the 33rd slot accommodating portion 13-33 to the 64th slot accommodating portion 13-64 by a crossover portion 14 forming a different level crossover portion, and a crossover forming the same level crossover portion 15 The conductor part 15 is comprised. As shown in FIG. 2, the slot accommodating portion 13 of the first continuous line portion and the slot accommodating portion 13 of the second continuous line portion are in layers (conductor accommodating positions) adjacent in the radial direction in the same slot 91. Is arranged. The conductor accommodation position of the same level of each slot 91 is alternately occupied by the slot accommodation part 13 of the first continuous line part and the slot accommodation part 13 of the second continuous line part.

(Transitional part 14 that forms a transitional part in different levels)
A large number of transition portions (different-layer transition portions) 14 coming out of the end surface of the stator core 9 on the pulley side constitute a first coil end 11. A large number of transition portions (different-layer transition portions) 14 coming out from the end surface of the stator core 9 on the side opposite to the pulley constitute a second coil end 12. In FIG. 2, a solid line indicates a crossing part (different level crossing part) 14 and a crossing conductor part (same level crossing part) 15 on the phase terminal side (second coil end 12 side), and a broken line indicates an antiphase terminal. The transition part (different hierarchy transition part) 14 of the side (1st coil end 11 side) is shown.

  The crossover portion (different-level crossover portion) 14 is an end portion of one slot accommodating portion 13, in other words, is inclined at a predetermined angle with respect to the axial direction and the circumferential direction from the opening end of one slot 91, and moves outward in the axial direction. Forward slanting part that advances 3 slots pitch to one side of the direction, and tilts at a predetermined angle with respect to the axial direction and the circumferential direction and moves toward the inner side in the axial direction, and advances to the other side by 3 slots pitch and accommodates another slot In other words, the end portion of the portion 13 has a return skew portion that reaches the opening end of another slot 91, and a turn portion that continues from the forward skew portion to the return skew portion.

  The forward skew portion and the return skew portion of the crossover portion (different level crossover portion) 14 are separated by one layer in the radial direction. The turn portion is formed by folding back the continuous line so as to reverse the conductor traveling direction in the axial direction and to shift the conductor in the radial direction by one layer.

  A return skew portion of one crossover portion (different level crossover portion) 14 obliquely provided on one side in the circumferential direction is adjacent to another crossover portion (differentiately provided on one side in the circumferential direction adjacent to one side in the circumferential direction). In order not to spatially interfere with the forward skew portion of the hierarchical crossover portion 14, the return skew portion of the one crossover portion 14 is located one layer away from the forward skew portion of the other crossover portion 14 in the radial direction. And crosses the forward skew portion of these other crossover portions 14 when viewed in the radial direction.

  The pulley-side crossover portion 14 indicated by a broken line is a 3-4 layer crossover portion 14-1 connecting the 4th layer and the 3rd layer, counting from the phase terminal 16 side, and 1-2 connecting the 2nd layer and the 1st layer. It has a layer crossing part 14-2. The crossover portion 14 on the side opposite to the pulley shown by a solid line is a 3-4 layer crossover portion 14-1 connecting the 3rd layer and the 4th layer, counting from the phase terminal 16 side, and 1− connecting the 1st layer and the 2nd layer. It has a 2-layer crossover section 14-2 and a 2-3-layer crossover section 14-3 that connects the 3rd layer and the 2nd layer. The 2-3 layer crossover portion 14-3 connects the second layer and the third layer adjacent to each other in the radial direction of a pair of protruding conductor portions 19 constituting the same-layer crossover portion described later.

  The first coil end 11 and the second coil end 12 are formed in a cylindrical shape by a belt-like winding band along the end surface of the stator core 9 by these crossover portions 14. The layer numbers referred to here are shown in the order from the radially inner side to the outer side. In FIG. 2, one phase winding is shown, but the remaining five phase windings are also formed in the same shape except that they are shifted in slot pitch.

(Same level crossing)
The crossover conductor portion (same-level crossover portion) 15 includes an end portion on the side opposite to the pulley of the thirty-second slot accommodating portion 13-32 that forms the end portion of the first continuous line when counted from one circumferential side of the winding band, The counter pulley side end of the 33rd slot accommodating portion 13-33 forming the end of the seventh continuous line counting from one circumferential side of the winding band is connected by welding. As shown in FIG. 1, the continuous line forming the thirty-second slot accommodating portion 13-32 and the thirty-second slot accommodating portion 13-32 protrudes long in the axial direction from the slot 91 toward the non-pulley side, and extends outward in the axial direction of the crossover portion 14. Has a protruding conductor portion 19 reaching. Therefore, both ends of the crossover conductor portion (same-layer crossover portion) 15 are individually welded to the tips of the pair of protruding conductor portions 19 to form a folded connection portion 18.

(Projecting conductor 19)
The protruding conductor portion 19 will be described.

  In this embodiment, the thirty-second slot accommodating portion 13-32 forming the end of the first continuous line and the thirty-third slot accommodating portion 13-33 forming the end of the second continuous line are the highest in the four layers. The first slot accommodating portion 13-1 that is disposed in the inner layer and forms the end of the first continuous line, and the 64th slot accommodating portion 13-64 that forms the end of the second continuous line portion are the outermost layers of the four layers. Is arranged. In other words, the protruding conductor portion 19 is disposed in the innermost layer, and the phase terminals 16 and 17 are disposed in the outermost layer. Further, the protruding conductor portion 19 and the phase terminal 16 are disposed at the same position in the circumferential direction.

  The projecting conductor part group consisting of a total of twelve projecting conductor parts 19 is composed of an oblique part obliquely arranged in the same direction as the forward oblique part of the aforementioned transition part 14 adjacent to both sides in the circumferential direction, and both ends thereof. And a proximal end orthogonal portion and a distal end orthogonal portion that extend in the axial direction. The insulating film at the tip portion of the tip direct portion is peeled off, and constitutes a folded connection portion 18 welded to the end portion of the transition conductor portion 15.

(Transfer conductor part 15)
The bridging conductor portion 15 is a U-shape formed by a circumferentially extending portion extending in the circumferential direction and two axially extending portions extending axially outward from both ends of the circumferentially extending portion. Made of conductor. The insulating film in the axially extending portion is peeled off, and the axially extending portion is welded to the tip direct portion of the protruding conductor portion 19 adjacent in the radial direction.

  As described above, the stator winding 10 has two sets of three-phase windings, and each phase winding having a phase difference of an electrical angle of 30 degrees between the two sets of three-phase windings is adjacent to each other. It is housed separately in the slot. Hereinafter, two phase windings having a phase difference of an electrical angle of 30 degrees out of two sets of three-phase windings are also referred to as a first coil and a second coil.

  The circumferentially extending portion of the transition conductor portion 15 belonging to the first coil and the circumferentially extending portion of the transition conductor portion 15 belonging to the second coil are disposed adjacent to each other in the radial direction. More specifically, the circumferentially extending portion of the transition conductor portion 15 belonging to the second coil is disposed radially outside the circumferentially extending portion of the transition conductor portion 15 belonging to the first coil. Further, the circumferentially extending portions of a total of six crossing conductor portions 15 are arranged at different positions in the axial direction for each phase of each three-phase winding. More specifically, the circumferentially extending portion of the transition conductor portion 15 belonging to the U-phase and X-phase phase windings is located on the innermost side in the axial direction, and the transition conductor portion belonging to the W-phase and Y-phase phase windings. The circumferentially extending portion 15 is arranged on the outermost side in the axial direction, and the circumferentially extending portion of the transition conductor portion 15 belonging to the V-phase and Z-phase phase windings is arranged at an axially intermediate position. In this way, a total of six crossing conductor portions 15 can be arranged while suppressing mutual spatial interference. In addition, since the circumferential direction extension part of the crossing conductor part 15 has a different axial direction position for every said phase, the axial direction position of the axial direction extension part of the crossing conductor part 15 will also differ. For this reason, the length of the straight portion at the tip of the protruding conductor portion 19 is adjusted accordingly. Eventually, in this embodiment, two sets of three-phase windings are configured by using one end of all six phase windings as a neutral lead wire and all other ends as output lead wires.

(Production method)
(Production of circumferentially developed stator coil)
First, a long insulation covered rectangular wire is bent in two at the center to form a long U-shaped segment. The long U-shaped segment is composed of a U-shaped head and a pair of legs extending in parallel and linearly at a distance of one magnetic pole pitch from both ends of the U-shaped head. The slot developed by repeating the step of folding back in the direction perpendicular to the leg extending direction so that the pair of legs of the long U-shaped segment constitutes the crossing part 14 at a predetermined pitch in the leg extending direction. An accommodating portion 13 and a coil end portion (also referred to as a cross-layer crossover portion or a crossover portion) 14 are formed. Six partial phase windings thus formed are aligned to constitute a circumferentially developed stator coil (folded stator coil).

(A stator coil with a circumferentially developed shape is inserted into the stator core)
Next, a process of inserting the circumferentially developed stator coil (folded stator coil) into a slot of the stator core (stator core) 9 will be described with reference to FIGS. FIG. 3 is a schematic perspective view showing the slot operation, and FIG. 4 is a schematic axial sectional view showing the slot insertion operation. 3 and 4, only one molded conductor wire 100 of the folded stator coil is shown for easy understanding, but in actuality, a total of six molded conductors shifted in the circumferential direction by one slot pitch. A stator coil having a circumferentially developed shape is formed by combining the wires. The slot 91 is an open slot.

  The formed conductor wire 100 shown in FIG. 3 is constituted by a flat wire having a width substantially equal to the circumferential width of the slot 91. Of course, the four corners of the formed conductor wire 100 can be appropriately chamfered.

  The formed conductor wire 100 has an odd-numbered slot accommodating portion 13a, an even-numbered slot accommodating portion 13b, and a coil end portion 14 that connects them. The coil end portion 14 on the pulley side (one axial direction side) includes a forward half portion (forward skew portion) 14a connected to the odd-numbered slot accommodating portion 13a and a return half portion (return) connected to the even-numbered slot accommodating portion 13b. (Slant part) 14b. The coil end portion 14 on the side opposite to the pulley (on the other side in the axial direction) includes a forward half portion (forward skew portion) 14c continuous with the even-numbered slot accommodating portion 13b and a return half portion continuous with the odd-numbered slot accommodating portion 13a ( 14d).

  In FIG. 4, the angle between the odd-numbered slot accommodating portion 13a and the forward half portion (forward skewed portion) 14a of the coil end portion 14 on the pulley side is θ1, and the even-numbered slot accommodating portion 13b and the pulley-side coil The angle between the return half portion (return skew portion) 14b of the end portion 14 is θ2, and the even-numbered slot accommodating portion 13b and the forward half portion (forward skew portion) 14c of the coil end portion 14 on the opposite pulley side The angle between the odd-numbered slot accommodating portion 13d and the return half portion (return skew portion) 14d of the coil end portion 14 on the opposite pulley side is defined as θ4.

  In this embodiment, as shown by a solid line in FIG. 4, θ1 to θ4 are all set to the same angle at the stage of forming the formed conductor wire 100. Of course, the angles θ1 to θ4 need not be equal.

  3 and 4 illustrate the middle portion of the molded conductor wire 100. In practice, however, the molded conductor wire 100 is accommodated in the radial inner side of the stator core 9 in order from one end thereof, and then radially outward. Energized and sequentially pushed into the slot 91. For this reason, in FIG. 4, the left slot accommodating portion 13 is located substantially inside the stator core 9 in the radial direction, and in FIG. 4, the right slot accommodating portion 13 is located only partially inside the stator core 9 in the radial direction. Not.

  As shown in FIG. 4, the molded conductor wire 100 is pushed from the pulley side (one axial side) to the inner side in the radial direction of the stator core 9 and then urged to the outer side in the radial direction to be pushed into the slot 91 of the open slot structure. . When the formed conductor wire 100 is pushed from the pulley side (one axial side) into the radial inner side of the stator core 9, the slot accommodating portion 13 of the formed conductor wire 100 is pushed so as to be positioned immediately below the slot 91 in the radial direction.

  The slot 91 has a skew. The first opening 911 on the pulley side of the slot 91 is shifted to the one side in the circumferential direction by a predetermined slot pitch in the circumferential direction from the second opening 912 on the side opposite to the pulley of the slot 91. Here, the one side in the circumferential direction is the winding direction of the formed conductor wire 100. In this embodiment, when the molded conductor wire 100 is pushed from the pulley side (one axial side) into the radial inner side of the stator core 9, the molded conductor wire 100 is pushed in the extending direction of the slot 91. See the indentation direction indicated by the arrows in FIG.

  In this embodiment, even if the odd-numbered slot accommodating portion 13a is completely pushed down to the position directly below the radial direction of the slot 91, all the even-numbered slot accommodating portions 13b adjacent to one side in the circumferential direction are still slots 91. It does not reach directly under the radial direction. Therefore, in this embodiment, as shown in FIG. 4, the even-numbered slot accommodating portion 13 b further pushes and bends the pulley-side coil end portion 14 to the position of the broken line, thereby making the even-numbered slot accommodating portion 13 b the stator core 9. Push it in completely until it is completely located inside the radial direction. In this way, the odd-numbered slot accommodating portion 13a and the even-numbered slot accommodating portion 13b of the molded conductor wire 100 are sequentially pushed into the slot 91 from one end side to the other end side of the molded conductor wire 100.

  After completion of the first process of pushing the slot accommodating portion 13 of the formed conductor wire 100 in the extending direction of the slot 91 and moving it radially inward of the stator core 9, the slot accommodating portion 13 is urged radially outward to form the slot. The second process pushed into 91 is performed, and the first process and the second process may be performed each time the first process is completed with respect to one slot accommodating portion 1, Alternatively, after the first process is completed for the plurality of slot accommodating portions 13, the second process may be performed on the plurality of slot accommodating portions 13 all at once.

  With reference to the circumferential development of the stator core 9 shown in FIG. 5, the step of pushing the formed conductor wire 100 of this embodiment will be described in more detail.

  The broken line shows a state in which the slot accommodating portion 13a1 of the formed conductor wire 100 has reached directly below the radial direction of the slot 91, and the next slot accommodating portion 13b1 has not yet completely reached the radially outer side of the slot 91. In this state, the slot accommodating portion 13a1 is urged radially outward and pushed into the slot accommodating portion 13.

  Next, the forward half (forward skew portion) 14 a 1 and the return half portion (return skew portion) 14 b 1 of the coil end portion 14 are pushed in the direction a that is the substantially extending direction of the slot 91. As a result, the slot accommodating portion 13b1 and the slot accommodating portion 13a2 completely reach the position immediately below (inside) the radial direction of the slot accommodating portion 13. The displacement of the slot accommodating portion 13 is precisely a turning operation centering on the intersection of the slot accommodating portion 13a1 and the forward half portion (forward oblique portion) 14c1. Next, the slot accommodating portion 13b1 and the slot accommodating portion 13a2 are urged radially outward and pushed into the slot 91. This state is shown by a solid line in FIG. Hereinafter, this process may be executed sequentially.

  This process ends when the process of pushing the slot accommodating portions 13 of the molded conductor wire 100 into the slots 91 of the stator core 9 is completed for all the slot accommodating portions 13.

(Welding of the folded conductor 15)
Next, the U-shaped head portion of the long U-shaped segment is cut and the folded conductor portion 15 is welded to complete the stator winding 10.

(effect)
That is, in this embodiment, when a distributed winding (preferably wave winding) stator coil is wound around a cylindrical stator core having an open slot structure, the slot accommodating portion 13 of the circumferentially developed stator coil is attached to the stator core 9. The process of pushing the stator core 9 radially inward from one side of the stator core 9 and then urging the stator core 9 radially outward and pushing it into the slot 91 is performed from one end side in the longitudinal direction of the stator coil having a circumferentially developed shape to the other end side. Do it sequentially. Further, a skew structure in which the first opening on the pulley side shifts in the winding direction with respect to the slot 91 more than the second opening on the opposite pulley side is given. Further, the slot accommodating portion 13 of the circumferentially developed stator coil is pushed in the extending direction in which the slot 91 is skewed and reaches just below the radial direction of the slot 91.

  In this way, deformation during winding of the stator coil 10 can be greatly reduced. Therefore, even a highly rigid circumferentially developed stator coil using a rectangular wire conductor can be easily attached to the stator core 9. Winding is possible, and automation thereof is facilitated.

(Modification)
The increase in the skew amount facilitates the winding operation, but when one slot accommodating portion 13 exceeds one magnetic pole pitch due to the skew, the output decrease becomes remarkable due to the decrease in the effective flux linkage and the increase in the copper loss. . In the above-described embodiment, the openings on both sides in the axial direction of the slot 91 are shifted by two slot pitches due to the skew of the slot 91. However, the skew amount (or skew angle) depends on the ease of winding work and the skew amount. (Or skew angle) can be suitably set in the range of 2 slot pitch to 1 magnetic pole pitch by taking into account the reduction in motor output due to excessively large skew angle. Preferably, when the inner diameter of the stator core 9 is r and the effective axial length of the stator core 9 is h, the skew angle θ of the slot 91 is preferably tan θ = h / r or more and 45 ° or less.

(Modification)
In the above-described embodiment, the molded conductor wire 100 of each phase is assembled in advance, and the circumferentially developed multiphase (here, three-phase) wave-wound stator coil 10 is created in advance. It is also possible to wind 100 around the stator core 9 separately for each phase.

It is a typical axial direction sectional view of the alternator for vehicles which adopted the return type stator coil of an embodiment. It is a side view which shows the coil end wiring state of the stator coil of FIG. It is a perspective view of the stator core which shows the state which inserts a coil in the slot with a skew. It is a schematic axial sectional view of a stator core showing a state where a coil is inserted into a slot having a skew. FIG. 5 is a circumferential development view of a stator core showing a coil insertion operation into a slot having a skew.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pulley side frame 2 Anti-pulley side frame 5 Rotating shaft 6 Pulley 7 Rotor (Landel type rotor)
8 Stator 9 Stator core (stator core)
10 Stator coil (stator winding)
DESCRIPTION OF SYMBOLS 11 Coil end 12 Coil end 13a1, 13a, 13a2, 13b1, 13b, 13d, 13 Slot accommodating part 14 Crossing part (different level crossing part), Coil end part 15 Crossing part (same level crossing conductor part)
16 phase terminal 17 phase terminal 18 connection part 19 projecting conductor part 91 slot 100 shaped conductor wire 911 opening 912 opening

Claims (4)

In a stator coil winding method for a rotating electrical machine in which a distributed stator coil is wound around a cylindrical stator core in which slots having an open slot structure are formed on an inner peripheral surface at a predetermined pitch in the circumferential direction.
A skew structure in which the first opening on one axial side of the slot is shifted by a predetermined slot pitch toward the one circumferential side than the second opening on the other axial side is formed in the stator core,
A preformed conductor wire is created in advance by alternately forming a slot accommodating portion and a coil end portion on the conductor wire,
Inserting the molded conductor wire into the slot by inserting the molded conductor wire into the slot by inserting the molded conductor wire from the first opening side to the radially inner side of the stator core and moving it outward in the radial direction; A stator coil winding method for a rotating electrical machine, which is sequentially performed from one end side of the rotating electric machine. In the stator coil winding method of the rotating electrical machine according to claim 1,
The stator coil having a circumferentially developed shape is created in advance by alternately forming a slot accommodating portion and a coil end portion on each of the molded conductor wires for at least the number of phases,
The circumferentially deployed stator coil is inserted from the first opening side into the stator core in the radial direction and moved radially outward to insert the slot housing portion of the circumferentially deployed stator coil into the slot. A stator coil winding method for a rotating electrical machine, in which the step of performing is performed sequentially from one end side of the circumferentially developed stator coil. In the stator coil winding method of the rotating electrical machine according to claim 1 or 2,
A stator coil winding method for a rotating electrical machine, wherein the formed conductor wire is a rectangular wire having a width substantially equal to a circumferential width of the slot. In the rotating electrical machine manufactured by the stator coil winding method of the rotating electrical machine according to any one of claims 1 to 3,
The rotating electrical machine according to claim 1, wherein the first opening of the slot has a skew that is shifted in the circumferential direction within a range of 2 slot pitch or more and 1 magnetic pole pitch or less with respect to the second opening.

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