WO2024069695A1 - Stator pour machine électrique rotative - Google Patents

Stator pour machine électrique rotative Download PDF

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Publication number
WO2024069695A1
WO2024069695A1 PCT/JP2022/035696 JP2022035696W WO2024069695A1 WO 2024069695 A1 WO2024069695 A1 WO 2024069695A1 JP 2022035696 W JP2022035696 W JP 2022035696W WO 2024069695 A1 WO2024069695 A1 WO 2024069695A1
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WO
WIPO (PCT)
Prior art keywords
stator
coil
segment
electric machine
rotating electric
Prior art date
Application number
PCT/JP2022/035696
Other languages
English (en)
Japanese (ja)
Inventor
洋三 廣瀬
Original Assignee
日産自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日産自動車株式会社 filed Critical 日産自動車株式会社
Priority to PCT/JP2022/035696 priority Critical patent/WO2024069695A1/fr
Publication of WO2024069695A1 publication Critical patent/WO2024069695A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto

Definitions

  • the present invention relates to a stator for a rotating electric machine, and more specifically, to a stator for a rotating electric machine that can suppress or prevent damage to a rectangular wire coil.
  • the present invention was made in consideration of the problems with the conventional technology, and aims to provide a stator for a rotating electrical machine that can suppress or prevent damage to the rectangular wire coil.
  • the inventors discovered that the above objective could be achieved by having one segment coil and the other segment coil of the rectangular wire coil have, as they move from the end face side of the stator core to the welded portion, a radial bent portion bent radially, a circumferential extension portion extending circumferentially adjacent to the radial bent portion, and an axial bent portion bent axially adjacent to the circumferential extension portion, without having any edgewise bent portions, and thus completing the present invention.
  • the stator of the rotating electric machine of the present invention comprises a circular stator core having a plurality of slots in the circumferential direction, and a plurality of rectangular wire segment coils wound around the stator core, the segment coils passing through the slots and protruding axially from the end face of the stator core.
  • An end of one segment coil of the rectangular wire coil and an end of another segment coil are welded together outside the slot to form a welded joint.
  • One segment coil and another segment coil are arranged in the slot and at the welded portion with the thickness direction of the segment coil aligned in the radial direction.
  • segment coil and the other segment coil transition from the end face side of the stator core to the welded portion side, they have a radial bent portion bent radially, a circumferential extending portion extending circumferentially adjacent to the radial bent portion, and an axial bent portion bent axially adjacent to the circumferential extending portion, and do not have any edgewise bent portions.
  • one segment coil and the other segment coil of the flat wire coil have a radial bend portion bent radially while moving from the end face side of the stator core to the welded portion side, a circumferential extension portion extending circumferentially adjacent to the radial bend portion, and an axial bend portion bent axially adjacent to the circumferential extension portion, and do not have any edgewise bent portions, so that a rotating electric stator can be provided that can suppress or prevent damage to the flat wire coil.
  • FIG. 1 is a perspective view showing a schematic diagram of a stator for a rotating electric machine according to a first embodiment of the present invention
  • 2 is an explanatory diagram illustrating a schematic view of a portion of a stator of the rotating electric machine illustrated in FIG. 1
  • FIG. 11 is an explanatory diagram illustrating a part of a rectangular wire coil in a stator of a rotating electric machine according to a second embodiment
  • FIG. 13 is an explanatory diagram illustrating a part of an example of a rectangular wire coil in a stator of a rotating electric machine according to a third embodiment.
  • 13 is an explanatory diagram illustrating a part of another example of a rectangular wire coil in a stator of a rotating electric machine according to the third embodiment;
  • FIG. 13 is an explanatory diagram illustrating a part of a rectangular wire coil in a stator of a rotating electric machine according to a fourth embodiment.
  • FIG. 13 is an explanatory diagram illustrating a part of a rectangular wire coil in a stator of a rotating electric machine according to a fifth embodiment.
  • FIG. 13 is an explanatory diagram illustrating a part of a rectangular wire coil in a stator of a rotating electric machine according to a sixth embodiment.
  • FIG. 13 is a cross-sectional view showing a schematic view of a part of a rectangular wire coil in a stator of a rotating electric machine according to a seventh embodiment.
  • 4 is an explanatory diagram showing a state in which a rectangular wire coil is formed in the stator of the rotating electric machine shown in FIG. 3 .
  • FIG. 3 is an explanatory diagram showing a state in which a rectangular wire coil is formed in the stator of the rotating electric machine shown in FIG. 3 .
  • stator of the rotating electric machine of the present invention will be described in detail below with reference to the drawings. Note that the dimensional ratios of the drawings cited below are exaggerated for the convenience of explanation and may differ from the actual ratios.
  • the "circumferential direction”, “axial direction” and “radial direction” respectively mean the circumferential direction, axial direction and radial direction of the annular stator core.
  • the "inner diameter side” and “outer diameter side” respectively mean the inner diameter side (inner peripheral surface side) and outer diameter side (outer peripheral surface side) of the annular stator core.
  • Fig. 1 is a perspective view of the stator of the rotating electric machine of this embodiment, as seen from the side where the segment coil is inserted.
  • Fig. 2 is a front view, as seen from the outer diameter side, of a part of the welding side of the segment coils stacked at the fifth and sixth positions from the inner diameter side in the stator of the rotating electric machine shown in Fig. 1. Note that in Fig. 2, for convenience of explanation, the segment coils stacked at the first to fourth positions from the inner diameter side are omitted.
  • the stator 1 of the rotating electric machine of this embodiment includes a stator core 10 and a rectangular wire coil 20 wound around the stator core 10.
  • the stator core 10 is annular and has multiple slots 10a in the circumferential direction of the stator core 10.
  • an integrated stator core formed by stacking multiple annular electromagnetic steel plates in the axial direction of the stator core 10 can be used as such a stator core 10.
  • the flat wire coil 20 is composed of a plurality of segment coils 21, and has a plurality of phases of flat wire coils 20A, 20B, 20C, which penetrate the slots 10a and protrude from the end face 10b of the welding side of the stator core 10 and the end face 10c of the insertion side in the axial direction of the stator core 10.
  • a flat wire coil 20 for example, it is preferable to use a U-shaped flat wire coil having an insulating coating (not shown) other than the end 21a that forms the welding portion 21b described in detail later.
  • the flat wire coil 20 is preferable as the aspect ratio (coil width/coil thickness) of the flat wire coil is larger.
  • the aspect ratio of the flat wire coil 20 is preferably 2 or more, more preferably 3 or more, even more preferably 5 or more, and preferably 20 or less, more preferably 15 or less, and even more preferably 10 or less.
  • the illustrated example is a three-phase type, and these phases are called the U phase, V phase, and W phase.
  • the end 21a of one segment coil 21 ⁇ of the rectangular wire coil 20 is welded to the end 21a of the other segment coil 21 ⁇ outside the slot 10a (see Figure 1) to form a welded portion 21b.
  • the end 21a of one segment coil 21 of the rectangular wire coil 20 is welded to the end 21a of another segment coil 21 outside the slot 10a to form a welded portion 21b.
  • one segment coil 21 ⁇ and the other segment coil 21 ⁇ are arranged in the slot 10a and the welded portion 21b with the thickness direction of the segment coils 21 ⁇ and 21 ⁇ aligned along the radial direction of the stator core 10.
  • the thickness direction of the segment coils 21 ⁇ and 21 ⁇ and the radial direction of the stator core 10 are perpendicular to the paper (front and back) in the center of FIG. 2, and are approximately perpendicular to the paper (front and back) on the right and left sides of FIG. 2.
  • one segment coil 21 ⁇ and the other segment coil 21 ⁇ have a radial bent portion 211, a circumferential extension portion 213, and an axial bent portion 215 while transitioning from the end face 10b side of the stator core 10 to the welded portion 21b side, and do not have any edgewise bent portions.
  • the radially bent portion 211 is bent flatwise toward the radial side.
  • the circumferentially extending portion 213 extends toward the circumferential side adjacent to the radially bent portion 211.
  • the axially bent portion 215 is bent flatwise toward the axial side adjacent to the circumferentially extending portion 213.
  • the radial, circumferential, and axial sides of one segment coil 21 ⁇ , which is stacked in the sixth (even-numbered) position from the inner diameter side in the radial direction, are the outer diameter side (the front side of the paper in FIG. 2), the counterclockwise direction when looking at the welded portion 21b from the axial direction (the right side in FIG. 2), and the axial direction (the upper side in FIG. 2), respectively.
  • the radial, circumferential, and axial sides of another segment coil 21 ⁇ , which is stacked in the fifth (odd-numbered) position from the inner diameter side in the radial direction, are the outer diameter side (the front side of the paper in FIG. 2), the clockwise direction when looking at the welded portion 21b from the axial direction (the left side in FIG. 2), and the axial direction (the upper side in FIG. 2), respectively.
  • the flat wire coil has the above-mentioned radial bent portion 211, circumferential extension portion 213, and axial bent portion 215, and does not have any edgewise bent portions, so that damage to the flat wire coil can be suppressed or prevented.
  • the segment coil can be deformed with a smaller force, and even if it comes into contact with another segment coil, the force applied to the other segment coil is also smaller.
  • the position of the end of the circumferential extension portion 213 on the end face 10b side of the stator core 10 in the axial direction of the stator core 10 can be formed by bending and is located as close as possible to the end face 10b. For example, this distance corresponds to the thickness of the rectangular wire segment coil 21.
  • such a rotating electric machine stator has the secondary advantage that it can be manufactured without a jig or with a simple jig, even when a segment coil with a higher aspect ratio (coil width/coil thickness) is used. Furthermore, when such a rotating electric machine stator is manufactured using a segment coil having an insulating coating, the amount of deformation of the insulating coating is small, so that the insulation quality can be improved. Furthermore, such a rotating electric machine stator has the secondary advantage that the distance between the welded parts can be increased, so that the insulation at the welded parts can be improved.
  • FIGS. 3 to 10 are diagrams illustrating the stator of the rotating electric machine of the present invention.
  • the same components as those in the first embodiment described above are given the same reference numerals, and detailed descriptions of the invention are omitted.
  • the upper view in Fig. 3 is a top view showing a schematic of a portion of the welded side of the segment coil.
  • the radial direction, circumferential direction, and axial direction are respectively the up-down direction, the left-right direction, and the direction perpendicular to the paper surface.
  • the lower view in Fig. 3 is a front view of a portion of the welded side of the segment coil seen from the outer diameter side.
  • the radial direction, circumferential direction, and axial direction are respectively the direction perpendicular to the paper surface, the left-right direction, and the up-down direction.
  • the circumferential extension portion 213 of the rectangular wire coil has the same structure as the stator of the rotating electric machine in the first embodiment, except that it has a twisted portion.
  • the circumferential extension portion 213 has a twisted portion that can be formed with less force than edgewise bending, which can suppress or prevent damage to the rectangular wire coil.
  • the upper views in Figures 4 and 5 are top views showing a schematic of a portion of the welded side of the segment coil.
  • the radial direction, circumferential direction, and axial direction are respectively the up-down direction, the left-right direction, and the direction perpendicular to the paper surface.
  • the lower views in Figures 4 and 5 are front views of a portion of the welded side of the segment coil as seen from the outer diameter side.
  • the radial direction, circumferential direction, and axial direction are respectively the direction perpendicular to the paper surface, the left-right direction, and the up-down direction.
  • the circumferential extension portion 213 of the rectangular wire coil has the same structure as the stator of the rotating electric machine of the first embodiment, except that it has a 180° bent portion (see the triangular fold portion in Figure 4) or a 90° bent portion (see the front part of the page in the left triangular fold portion in Figure 5 and the back part of the page in the right triangular fold portion in Figure 5).
  • the circumferential extension portion 213 has 90° bent portions and 180° bent portions that utilize flatwise bending, which can be formed with less force than edgewise bending, and therefore damage to the rectangular wire coil can be suppressed or prevented.
  • each of the multiple slots 10a has segment coils 21A to 21F arranged in a stack in the radial direction of the stator core 10, and the bending directions of the radial bending portions 213 are aligned on the outer diameter side, except that the structure is the same as that of the stator of the rotating electric machine of the first embodiment.
  • the radial direction, circumferential direction, and axial direction of the stator core are the left-right direction, the direction perpendicular to the paper surface, and the up-down direction, respectively. The same is true in Figs. 7 and 8.
  • the ends 21a of the segment coils 21A to 21F are arranged on the outer diameter side in the radial direction, so in addition to the advantages of the first embodiment, when this stator is applied to a rotating electric machine of the so-called inner rotor type in which a rotor (not shown) is housed on the inner diameter side of the stator, interference between the rectangular wire coil and the rotor can be avoided.
  • the stator has segment coils 21A to 21F stacked in the radial direction of the stator core 10 in each of the multiple slots 10a, and has the same structure as the stator of the rotating electric machine of the first embodiment, except that the bending direction of the radial bending portions 213 of the segment coils 21A to 21C arranged on the outer diameter side among the multiple segment coils 21A to 21F faces the outer diameter side, and the bending direction of the radial bending portions 213 of the segment coils 21D to 21F arranged on the inner diameter side faces the inner diameter side.
  • the ends 21a of the segment coils 21A to 21C are arranged on the outer diameter side in the radial direction, and the ends 21a of the segment coils 21D to 21F are arranged on the inner diameter side in the radial direction, so in addition to the advantages of the fourth embodiment, the coil ends can be further shortened.
  • this embodiment has the same structure as the stator of the rotating electric machine of the fifth embodiment, except that the axial bending portion 215 is located closer to the end face of the stator core 10 in the axial direction of the stator core 10 than the radial bending portion 211.
  • the axial bend portion 215 is provided closer to the end face of the stator core 10 in the axial direction of the stator core 10 than the radial bend portion 211, so the coil end can be made even shorter than in the fifth embodiment.
  • the flat wire coil 20 has the same structure as the stator of the rotating electric machine of the first embodiment, except that it is composed of split coils 201 to 205 split in its width direction (left and right direction in FIG. 9).
  • the split coils 201 to 205 have a conductor 206, such as copper wire, covered with an insulating coating 207. These split coils 201 to 205 are further covered with an insulating film 208 to form the integrated flat wire coil 20.
  • the conductor 206 extends in the direction perpendicular to the page.
  • the materials of the insulating coatings 207 and 208 may be the same or different.
  • the stator of the rotating electric machine of this embodiment uses the flat wire coil 20 called Litz wire as described above, so in addition to the advantages of the first embodiment, it is less susceptible to the skin effect and can reduce eddy current loss when used in the high frequency range.
  • Figure 10 is an explanatory diagram showing how the rectangular wire coil is formed in the rotating electric machine stator shown in Figure 3.
  • the upper, center, and lower figures on the left side of Figure 10 show multiple slots 10a formed in the circumferential direction linearly expanded.
  • the upper, center, and lower figures on the right side of Figure 10 show the cross-sectional state along line A-A in the corresponding left side figure.
  • a segment coil 21 is inserted into each slot 10a.
  • the segment coil 21 is flatwise bent to form a portion that will become a radial bent portion 211 and an axial bent portion 215 by subsequent circumferential bending of the coil.
  • the end portion 21a of the segment coil is bent in the circumferential direction (to the right in FIG. 4) to form a circumferential extension portion 213 having a twisted portion. Note that in order to form the twisted portion, some space is required, as shown by the dotted line in the lower diagram on the right side of FIG. 10.
  • the end portions 21a are aligned and welded together at necessary locations to form welded portions 21b, and a stator for a rotating electric machine can be obtained.
  • the gist of the present invention is that the segment coil is not bent edgewise after it is inserted into the slot of the stator core in order to suppress or prevent damage to the rectangular wire coil.
  • the present invention has been described with an example of application to the stator of an inner rotor type rotating electric machine, this is not intended to be limiting.
  • the present invention can also be applied to the stator of an outer rotor type rotating electric machine.
  • a segment coil having a U-shape has been described with an example, this is not intended to be limiting.
  • a segment coil having a straight shape can also be used.
  • a rectangular wire coil having an insulating coating has been described with an example, this is not intended to be limiting.
  • each rectangular wire coil can be coated with a resin material so as to be insulated.
  • the circumferential extension portion 213 has been described as having a twisted portion that can be formed with less force than edgewise bending, and as having a 90° bent portion or a 180° bent portion that utilizes flatwise bending, but is not limited to these.
  • the circumferential extension portion may have a combination of these portions.
  • the components described above are not limited to the configurations shown in each embodiment, and it is possible to change the details of the specifications and materials of the stator core, rectangular wire coil, and segment coil, or to replace or combine components of one embodiment with components of another embodiment.
  • Stator core 10a Slots 10b, 10c End faces 20, 20A, 20B, 20C Flat wire coils 201 to 205 Split coils 206 Conductors 207, 208 Insulating coatings 21, 21 ⁇ , 21 ⁇ , 21A to 21F Segment coils 21a Ends 21b Welded portions 211 Radial bends 213 Circumferential extensions 215 Axial bends

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)

Abstract

Ce stator pour une machine électrique rotative est équipé : d'un noyau de stator qui possède une fente ; et d'une bobine de fil plat qui comprend des bobines de segment, passe à travers la fente, et fait saillie à partir de la surface d'extrémité du noyau de stator dans la direction axiale. Une section d'extrémité d'une bobine de segment et une section d'extrémité d'une autre bobine de segment forment une section soudée. La bobine de segment et l'autre bobine de segment sont positionnées dans un état dans lequel la direction d'épaisseur de bobine de segment à l'intérieur de la fente et dans la section soudée s'aligne avec la direction radiale, et possèdent, dans l'intervalle depuis le côté de surface d'extrémité du noyau de stator vers le côté de section soudée, une section de courbure de direction radiale qui s'incurve vers le côté de direction radiale, une section d'extension de direction périphérique qui est adjacente à la section de courbure de direction radiale et s'étend vers le côté de direction périphérique, et une section de courbure de direction axiale qui est adjacente à la section d'extension de direction périphérique et s'incurve vers le côté de direction axiale, mais n'a pas de section de courbure de bord.
PCT/JP2022/035696 2022-09-26 2022-09-26 Stator pour machine électrique rotative WO2024069695A1 (fr)

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PCT/JP2022/035696 WO2024069695A1 (fr) 2022-09-26 2022-09-26 Stator pour machine électrique rotative

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Application Number Priority Date Filing Date Title
PCT/JP2022/035696 WO2024069695A1 (fr) 2022-09-26 2022-09-26 Stator pour machine électrique rotative

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003219588A (ja) * 2002-01-18 2003-07-31 Denso Corp 車両用回転電機の固定子及びその製造方法
JP2011229307A (ja) * 2010-04-21 2011-11-10 Denso Corp 回転電機の固定子及びその製造方法
JP2013055732A (ja) * 2011-09-01 2013-03-21 Toyota Motor Corp 回転電機ステータ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003219588A (ja) * 2002-01-18 2003-07-31 Denso Corp 車両用回転電機の固定子及びその製造方法
JP2011229307A (ja) * 2010-04-21 2011-11-10 Denso Corp 回転電機の固定子及びその製造方法
JP2013055732A (ja) * 2011-09-01 2013-03-21 Toyota Motor Corp 回転電機ステータ

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