JP2013005652A - Rotary electric machine and concentrated winding coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine and a concentrated winding coil thereof, ensuring insulation performance while improving space factor using a flat wire.SOLUTION: The rotary electric machine 10 includes: a stator core 12 having slots partitioned by adjacent teeth 18; and concentrated winding coils 20, 30 wound on the teeth 18 of the stator core 12 by use of flat wires 22, 32 formed by covering conductor wires 24, 34 having a rectangular cross section with insulating films 26, 36 with a uniform thickness. The cross sections of the flat wires 22, 32 have notched corners 28, 38 formed by notching a corner part on a side opposite to another concentrated winding coil arranged in the same slot. The teeth may be tapered teeth where the teeth width at the tip measured along a circumferential direction of the stator core is smaller than that at the root side of the stator core.

Description

  The present invention relates to a rotating electrical machine and a concentrated winding coil, and more particularly to a rotating electrical machine having a stator core around which a concentrated winding coil using a flat wire is wound, and a concentrated winding coil used therefor.

  A coil is wound around the stator of the rotating electric machine. Specifically, a plurality of slots are provided in the stator, and a conductive wire is wound around a protruding portion called a tooth between adjacent slots. By winding a large number of conductive wires between the limited slots, the coil space factor is improved and a small rotating electrical machine is obtained. Here, as the coil conductor, a rectangular wire with a rectangular cross-sectional shape is easier to improve the space factor than a round wire with a circular cross-sectional shape.

  For example, Patent Document 1 describes that a plurality of concentrated winding portions are continuously formed with the same rectangular wire as a concentrated winding stator that is easy to manufacture. A multi-phase stator can be obtained by manufacturing a plurality of concentrated winding portions formed in this way by the number of each phase and arranging them in the circumferential direction of the stator.

  In Patent Document 2, in a vehicular rotating electrical machine having a concentrated winding type stator, a rectangular wire is further wound from the root side to the tip side of the teeth having the same circumferential width along the radial direction. By the way, a two-layered concentrated winding coil is described which is folded back and wound further on one layer from the tip side to the root side of the teeth. Here, it is disclosed that the winding of the second layer is pushed down and pushed up against the root side of the tooth so that the coil end does not protrude at the end of the tip side.

  Patent Document 3 describes that a coil having a shape in which the head of a quadrangular pyramid is cut is used in order to improve the space factor in the slot of the motor coil. Such a deformed coil is formed by pressing a helical coil in the axial direction so that the inner diameter side coil is thick and narrow, and the outer diameter side coil is thin and wide. It has been pointed out that the coil formed in this way undergoes a large change in the magnetic field on the inner diameter side, and the eddy current loss increases due to the thick coil thickness. Here, a configuration in which one winding is laminated with a thin strip-shaped conductor portion covered with a thin insulating layer to suppress eddy current and cover the outermost periphery with a thick insulating layer is disclosed.

  In Patent Document 4, a rectangular conductor having a rectangular cross section is pressed against an inner diameter of a large-diameter stripping die or a round wire drawing die as an insulated rectangular electric wire in which the corner is not exposed from the insulating film, and the angle of the corner is determined. It is disclosed to make it a polygonal shape having 120 degrees or more.

  In Patent Document 5, in the electrical equipment winding, six base conductors are arranged in a column to form a first conductor group, and similarly, six base conductors are arranged in a column to form a second conductor group. Describes that the insulating layer on the opposing surface facing the other conductor group is made thicker than the other part. In order to do this, it is disclosed that the powder resin adhered to all parts of the conductor by the electrostatic flow method is collected and baked at a specific part by twisting the conductor.

  Patent Document 6 states that Patent Document 2 improves the space factor while ensuring insulation by providing a self-bonding layer only on the side surface on the teeth side in the rectangular wire for the coil. It has been.

JP 2010-16970 A JP 2006-20490 A JP 2006-158024 A JP 2004-134113 A JP 60-234439 A JP 2009-225507 A

  By using a flat wire, it is possible to improve the space factor as a concentrated winding coil compared to a round wire or the like. However, in the case of a flat wire, the corner protrudes, so between adjacent concentrated winding coils. The space between the opposing flat wires becomes narrow. In that case, the insulation performance deteriorates at the narrow interval.

  The objective of this invention is providing the rotary electric machine and concentrated winding coil which can ensure insulation performance, aiming at the improvement of a space factor using a flat wire.

  The rotating electrical machine according to the present invention is wound around each tooth of the stator core using a stator core having a plurality of slots partitioned by adjacent teeth and a rectangular wire covering a rectangular conductor wire with a uniform thickness insulating film. The flat wire is characterized by having a cross-sectional shape in which a corner portion on the side facing another concentrated winding coil arranged in the same slot is cut out.

  In the rotating electrical machine according to the present invention, it is preferable that the tooth is a taper tooth whose tooth width measured along the circumferential direction of the stator core is smaller on the tooth tip side than on the root side of the stator core.

  A concentrated winding coil according to the present invention is a concentrated winding coil in which a rectangular wire having a rectangular cross section is wound with a flat wire covering an insulating film having a uniform thickness. A rectangular wire having a cross-sectional shape having a cut-out corner portion cut out from one corner portion is used, and the wire is wound so that the cut-out corner portion comes to the outer peripheral side of the winding.

  In the concentrated winding coil according to the present invention, it is preferable that the winding width is a coil for taper teeth winding in which the width of the winding changes from a large width to a small width along the axial direction of the winding.

  With the configuration described above, the rotating electrical machine uses a rectangular wire having a rectangular cross-section and a flat wire that covers an insulating film with a uniform thickness, and the rectangular wire is on the side facing another concentrated winding coil disposed in the same slot. It has a cross-sectional shape with a corner cut out. As a result, it is possible to suppress the interval between the rectangular wires facing each other between the adjacent concentrated winding coils from being narrowed, so that the insulation performance can be ensured while improving the space factor.

  Further, in the rotating electrical machine, even when the teeth are tapered teeth, it is possible to suppress the interval between the rectangular wires facing each other from being narrowed between adjacent concentrated winding coils. Thus, by using the taper teeth, the space factor can be further improved, and at the same time, insulation performance can be ensured.

  In addition, the concentrated winding coil has a cross-sectional shape having a cut-out corner portion in which one corner portion is cut out of four corner portions of a flat wire that covers a rectangular-shaped conducting wire with an insulating film having a uniform thickness. The flat wire is used and wound so that the notched corners are on the outer periphery of the winding. Thereby, it can suppress that the space | interval between the rectangular wires which oppose between other concentrated winding coils arrange | positioned at the same slot of a rotary electric machine becomes narrow.

  Moreover, even if the concentrated winding coil is a coil for winding taper teeth, it is possible to suppress the interval between the adjacent rectangular wires from being narrowed between adjacent concentrated winding coils.

In the rotary electric machine of embodiment which concerns on this invention, it is a figure which shows the relationship between the concentrated winding coils arrange | positioned at the same slot. In the rotary electric machine of embodiment which concerns on this invention, it is a figure which shows the relationship between the concentrated winding coils arrange | positioned in the same slot about the case of the aligned winding concentrated winding coil. It is a figure which shows the case where the concentrated winding coil using the rectangular wire of a prior art is arrange | positioned for the same stator core as FIG. 2 for the comparison. In the rotary electric machine of embodiment which concerns on this invention, it is a figure which shows the relationship between the concentrated winding coils arrange | positioned in the same slot about the case of the tapered winding concentrated winding coil. It is a figure which shows the case where the concentrated winding coil using the rectangular wire of a prior art is arrange | positioned for the same stator core as FIG. 2 for the comparison.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Below, the rotary electric machine mounted in a vehicle is demonstrated as a rotary electric machine, However, You may use other than vehicle mounting. The tooth shape, slot shape, concentrated winding coil winding number, rectangular wire rectangular shape, etc. described below are examples for explanation, and may be appropriately changed according to the specifications of the rotating electrical machine and the concentrated winding coil. Is possible.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram showing a stator in a rotating electrical machine 10 for mounting on a vehicle. Here, the stator core 12 constituting the stator and the coil ends 14 and 16 in which the coils wound around the teeth 18 of the stator core 12 protrude from both axial ends of the stator core 12 are shown.

  The teeth 18 are protrusions provided for winding the coil winding around the stator core 12. Actually, a plurality of slots 40 (see FIG. 2) defined by adjacent teeth are provided in the circumferential direction of the stator core 12, and conducting wires are passed through the slots 40 on both sides of one tooth 18. Is wound into a coil. Therefore, two adjacent coils are arranged in one slot 40.

  In FIG. 1, two concentrated winding coils 20 and 30 respectively wound around adjacent teeth 18 are extracted and shown as part A. The concentrated winding coils 20 and 30 are coils that are wound around the teeth 18 of the stator core 12 using a flat wire that covers a rectangular conductor wire with an insulating film having a uniform thickness.

  Since the stator core 12 is an annular member as shown in FIG. 1, the teeth 18 are formed radially in the annular shape. Therefore, the two concentrated winding coils 20 and 30 are also arranged radially rather than in parallel. That is, the distance between the windings of the adjacent two concentrated winding coils 20 and 30 differs between the root side of the tooth 18 and the tip side, and becomes narrow at the tip side of the tooth 18 as shown in FIG. When the distance between the windings arranged to face each other is reduced, the insulation performance of the concentrated winding coils 20 and 30 is degraded.

  In FIG. 1, as a portion B, a cross-sectional view of the rectangular wires 22 and 32 is shown for the windings on the tip side of the teeth 18 of the concentrated winding coils 20 and 30. Since the rectangular wires 22 and 32 used for the concentrated winding coils 20 and 30 are the same, the rectangular wire 22 will be described first. The flat wire 22 is a conducting wire with an insulating coating in which a conducting wire 24 having a rectangular cross section is coated with an insulating coating 26 having a uniform thickness. Here, the cross-sectional shape of the flat wire 22 has a cut-out corner portion 28 in which one corner portion is cut out of the four corner portions of the rectangular shape. Since the flat wire 22 has an insulating film with a uniform thickness, the cross-sectional shape of the conducting wire 24 has a cut-out corner.

  The concentrated winding coil 20 is wound such that the notched corner portion 28 comes to the outer peripheral side of the winding. As a result, the notched corner 28 comes to the side facing the other concentrated winding coil 30 arranged in the same slot.

  Similarly, the rectangular wire 32 of the concentrated winding coil 30 is also a conductor with an insulation film in which a conductor 34 having a rectangular cross section is coated with an insulation film 36 having a uniform thickness. Here, the cross-sectional shape of the rectangular wire 32 has a cut-out corner portion 38 obtained by cutting out one corner portion among the four corner portions of the rectangular shape. The concentrated winding coil 30 is also wound such that the cut-out corner portion 38 comes to the outer peripheral side of the winding. As a result, the notched corner 38 comes to the side facing the concentrated winding coil 20 disposed in the same slot.

  As described above, in the rotating electrical machine 10, the rectangular wires 22 and 32 having a cut-out corner portion in which one corner portion is cut out of the four corner portions of the rectangular shape are used, and the cut-out corner portion 28 is used. , 38 are arranged such that the concentrated winding coils 20 and 30 are wound so that they come to the outer peripheral side of the winding. In other words, the rectangular wires 22 and 32 have a cross-sectional shape in which the corners on the side facing the other concentrated winding coils arranged in the same slot are cut out. As a result, the opposing distance between the concentrated winding coils 20 and 30 is increased, so that insulation performance can be ensured.

  FIG. 2 shows a concentrated winding coil 20 wound around a general tooth 18 in which the teeth width measured along the circumferential direction of the stator core 12 is substantially the same on the tip end side of the teeth and the root side of the stator core 12 by aligned winding. , 30 is a diagram for explaining the situation in the slot 40. Here, one slot 40 of the stator core 12 of the rotating electrical machine 10 is shown. The slot 40 is a hole through which the windings of the concentrated winding coils 20 and 30 are passed, and is a space defined by the adjacent teeth 18. The concentrated winding coil 20 shows the right half winding in the drawing for the annular winding, and the concentrated winding coil 30 also shows the left half winding in the drawing for the annular winding.

  As described with reference to FIG. 1, the flat wire 22 of the concentrated winding coil 20 is covered with the insulating film 26 having a uniform thickness around the conductive wire 24. And the cross-sectional shape of the flat wire 22 has the notch corner part 28 which notched one corner part among the four corner parts of a rectangular shape. Similarly, the flat wire 32 of the concentrated winding coil 30 is coated with an insulating film 36 having a uniform thickness around the conducting wire 34. The cross-sectional shape of the flat wire 32 has a cut-out corner portion 38 in which one corner portion is cut out of the four corner portions of the rectangular shape.

  In FIG. 2, the interval between the rectangular wires 22 and 32 facing each other between the concentrated winding coil 20 and the concentrated winding coil 30 is indicated by S2. This S2 is widened by the cut-out corners 28 and 38, which can be clearly understood by comparing with FIG.

  FIG. 3 shows that the concentrated winding coils 50 and 60 are wound around the teeth 18 by using the rectangular wires 52 and 62 having a general rectangular cross section without the notched corners in the same stator core 12 as FIG. It is a figure which shows the mode of time. The rectangular wires 52 and 62 used for the concentrated winding coils 50 and 60 are covered with insulating films 56 and 66 having the same thickness as the insulating films 26 and 36 of the rectangular wires 22 and 32 in FIG. Is done. The cross-sectional shapes of the flat wires 52 and 62 have long and short sides having the same length as the flat wires 22 and 32 described in FIG. 2 except that they do not have cut-out corners.

  In FIG. 3, the interval between the rectangular wires 52 and 62 facing each other between the concentrated winding coil 50 and the concentrated winding coil 60 is indicated by S1. Compared to FIG. 2, S1 is shorter than S2 by the amount that the notched corners 28 and 38 are not provided. In other words, in the configuration of FIG. 2, S2 is wider than S1 by the amount of the notched corner portions 28 and 38. Thereby, in the same slot 40, the insulation performance between the rectangular wires 22 and 32 which oppose is improved rather than the case of the prior art shown by FIG.

  FIG. 4 shows that the tooth width measured along the circumferential direction of the stator core 13 is smaller than the root side of the stator core 13 on the tooth tip side, and taper-like teeth 72 taper from the root side toward the tip side. It is a figure explaining the mode in the slot of the concentrated winding coils 80 and 90 wound by the taper-shaped winding. Since the stator core 13 includes the tapered teeth 72, the slot width of the slot 70 measured along the circumferential direction of the stator core 13 is substantially the same on the tooth tip side and the root side of the stator core 13. From the viewpoint of the concentrated winding coils 80 and 90, the concentrated winding coils 80 and 90 are coils for taper teeth winding, and the width of the winding is large along the axial direction of the winding. To a small width.

  The rectangular wires 82 and 92 used for the concentrated winding coils 80 and 90 are the same as the rectangular wires 22 and 32 described with reference to FIGS. That is, the flat wires 82 and 92 are covered with insulating films 86 and 96 having a uniform thickness around the conductor wires 84 and 94, respectively. And the cross-sectional shape of the flat wire 82 and 92 has the notch corner parts 88 and 98 which notched one corner part among the four corner parts of a rectangular shape, respectively.

  In FIG. 4, the interval between the rectangular wires 82 and 92 facing each other between the concentrated winding coil 80 and the concentrated winding coil 90 is indicated by S4. This S4 is widened by the cut-out corners 88 and 98, which can be clearly understood by comparing with FIG.

  FIG. 5 shows that the concentrated winding coils 100 and 110 are wound around the teeth 72 using the rectangular wires 102 and 112 having a general rectangular cross section without the notched corners in the same stator core 13 as FIG. It is a figure which shows the mode of time. The rectangular wires 102 and 112 used for the concentrated winding coils 100 and 110 are the same as the rectangular wires 52 and 62 described in FIG. That is, the flat wires 102 and 112 are covered with insulating films 106 and 116 having a uniform thickness around the conductive wires 104 and 114, respectively. And the cross-sectional shape of the flat wire 102,112 has the long side and the short side of the same length as the flat wire 82,92 demonstrated in FIG. 4 except not having a notch corner part.

  In FIG. 5, the interval between the rectangular wires 102 and 112 facing each other between the concentrated winding coil 100 and the concentrated winding coil 110 is indicated by S3. Compared to FIG. 4, S3 is shorter than S4 by the amount that the notched corners 88 and 98 are not provided. In other words, in the configuration of FIG. 4, S4 is wider than S3 by the amount of the notched corners 88 and 98. Thereby, in the same slot 70, the insulation performance between the rectangular wires 82 and 92 which oppose is improved rather than the case of the prior art shown by FIG.

  The rotating electrical machine and concentrated winding coil according to the present invention can be used for a rotating electrical machine using a rectangular wire and a concentrated winding coil used therefor.

  10 Rotating machine, 12, 13 Stator core, 14, 16 Coil end, 18, 72 Teeth, 20, 30, 50, 60, 80, 90, 100, 110 Concentrated winding coil, 22, 32, 52, 62, 82, 92 , 102, 112 Flat wire, 24, 34, 54, 64, 84, 94, 104, 114 Conductor wire, 26, 36, 56, 66, 86, 96, 106, 116 Insulating film, 28, 38, 88, 98 Notched corner, 40,70 slots.

Claims (4)

A stator core having a plurality of slots defined by adjacent teeth;
A concentrated winding coil wound around each tooth of the stator core using a rectangular wire covering a rectangular conductor wire with a uniform thickness insulating film;
With
The flat wire is
A rotating electric machine having a cross-sectional shape in which a corner portion on the side facing another concentrated winding coil arranged in the same slot is cut out. In the rotating electrical machine according to claim 1,
Teeth
A rotating electrical machine characterized in that the tooth width measured along the circumferential direction of the stator core is a tapered tooth whose tooth tip side is smaller than the root side of the stator core. A concentrated winding coil in which a rectangular wire having a rectangular cross section is wound with a rectangular wire covering an insulating film of uniform thickness,
A rectangular wire having a cut-out corner portion in which one corner portion was cut out of the four corner portions of the rectangular shape was used, and the cut-out corner portion was wound so as to come to the outer peripheral side of the winding. Concentrated winding coil characterized by that. The concentrated winding coil according to claim 3,
A concentrated winding coil, wherein the winding width is a coil for winding a taper tooth whose width varies from a large width to a small width along an axial direction of the winding.

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