JP2009011151A - Stator of rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator of a rotating electric machine having improved insulating performance. <P>SOLUTION: The stator of the rotating electric machine, which is disposed at a position opposite to a rotor forming a plurality of magnetic poles alternately different in a circumferential direction, is provided with a stator core having a plurality of slots in the circumferential direction, and a stator wiring formed of a wire material having a substantially rectangular cross section and wound around the slots. The wire material has slot housing portions 40 housed in the slots different in the circumferential direction, and a turn portion for connecting the slot housing portions outside the slots, the protruding portion of the turn portion 42 protruding from the slot is formed into a step toward the two slots housing the wire material and has a concave portion 41 inside a step-like bent portion. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stator for a rotating electric machine mounted on a passenger car or the like.

Conventionally, a structure of a stator winding formed by inserting a U-shaped conductor segment into a slot of a stator core and joining ends of the conductor segment protruding to the opposite side by welding or the like has been provided. It is known (for example, refer to Patent Document 1). In this stator winding, since a U-shaped conductor segment formed by twisting is used, a gap is generated between the turn portions of adjacent conductor segments when assembled to the stator core. For this reason, the insulation distance between conductors is ensured in the coil end part.
Japanese Patent No. 3438570 (page 5-7, FIG. 1-13)

  By the way, in the structure disclosed by patent document 1, since the twisted U-shaped conductor segment is used, the insulation distance between the conductors of a coil end part is ensured, but the height of a coil end part is set. If the shape of the conductor at the coil end part is formed in order to make it low, or if a coil end part with a low height is formed by forming a wire without twisting, the insulation coating formed on the outer periphery of the wire part will be partially However, there is a problem that the insulation performance deteriorates. This problem can be solved by inserting an insulating member such as insulating paper between the conductors of the coil end portion. However, the height of the coil end increases and the number of parts increases accordingly. Not desirable.

  The present invention was created in view of the above points, and an object thereof is to provide a stator of a rotating electrical machine that can improve insulation performance.

  In order to solve the above-described problem, a stator of a rotating electrical machine according to the present invention includes a stator core having a plurality of slots in the circumferential direction, and a stator winding formed of a wire and installed in the slots. The stator winding has a slot accommodating portion accommodated in a different slot in the circumferential direction, and a turn portion connecting the slot accommodating portions to each other outside the slot, and a turn portion protruding from the slot, A step portion is formed along the end face of the stator core, and a recess is formed inside the bent portion of the step portion.

  In this way, by forming a concave portion inside the staircase-shaped bent portion of the wire, when the same-shaped wire rods are arranged in an overlapping manner, the insulating coating outside the staircase-shaped bent portion of another adjacent wire material is formed. The distance between the wires between the thinned portion can be secured, and the insulation performance can be improved by preventing the deterioration of the insulation due to the occurrence of corona discharge or the like. In addition, a protruding portion where the turn portion of the wire connecting the slot housing portions of the wire outside the slot protrudes from the slot is formed with a step portion toward the slots arranged across the wire. Therefore, the interval between the protruding portions of the turn portion is narrower than the interval between the slots where the wire is disposed, the shape of the wire protruding from the stator core is reduced as a whole, and the height of the coil end is reduced. can do.

  In addition, it is desirable that stepped portions along the end face of the stator core are formed at all projecting portions of the turn portion projecting from the above-described slot. Alternatively, it is desirable that the above-described recess is formed by the width of the wire. Thereby, in all the turn parts or the whole width direction of a wire, the distance between adjacent wires can be secured and insulation performance can be improved reliably.

  Moreover, it is desirable that the above-described wire has a conductor, further has an insulating film covering the outer periphery of the conductor, the insulating film has a thickness of 100 to 200 μm, and the depth of the recess is 50 μm or less. When a wire covered with an insulating film having a thickness of 100 to 200 μm is bent into a staircase shape, the thickness of the insulating film outside the bent portion is reduced by about 20 to 30 μm. Therefore, even if the depth of the recess is set to 50 μm or less, the decreased distance between the thickness dividing wires can be expanded. In addition, by setting the depth of the concave portion to 50 μm or less, there is almost no reduction in the cross section of the wire, so that an increase in the resistance value of the stator winding can be suppressed.

  Moreover, it is desirable that the above-described turn part has a crank part formed in a crank shape at a position farthest from the stator core. Thereby, since the length of the wire from the stator core end surface to the crank portion becomes long, the step portion can be easily formed.

  Moreover, it is desirable that the above-described crank portion be formed in parallel to the end face of the stator core. Thereby, since a wire can be shape | molded in the shape of a stator winding | coil, without twisting, manufacture of a stator winding | coil becomes easy.

  Further, it is desirable that the above-described crank portion is displaced in the radial direction of the stator core by the width of the wire. As a result, the wire rods can be arranged in the radial direction without any gap, so that the radial width of the stator winding can be reduced.

  Further, when the number of phases of the stator winding described above is k and the number of slots of each phase per pole of the rotor is t, the total number of step portions formed in the turn portion is (k × t). It is desirable to be.

  When the number of phases of the stator winding is k and the number of slots of each phase per one pole of the rotor is t, the k-phase stator winding adjacent in the circumferential direction is wound 1 The total number of slots per pole is k × t. As a result, the wires arranged across different slots in the circumferential direction are arranged in slots separated by k × t in the circumferential direction, so that the wires protruding from the slots adjacent in the circumferential direction In order to avoid interference, (k × t) steps are required for the turn part. Thus, by forming (k × t) stepped shapes, interference between the wires can be prevented and the height of the coil end can be further reduced.

  Further, it is desirable that the length of the projecting portion of the turn portion described above along the axial end surface of the stator core is equal to or shorter than the interval between slots adjacent in the circumferential direction. Thereby, it can prevent that the protrusion part of the wire which protrudes from a slot interferes with the wire which protrudes from the slot adjacent to the circumferential direction.

  Moreover, it is desirable that the above-described wire is continuously formed over the entire circumference of the stator core. Thereby, the manufacturing cost of the stator winding can be reduced, and the occurrence of connection failure such as corrosion at the electrical connection location can be reduced.

  Moreover, as for the wire mentioned above, it is desirable for a cross-sectional shape to be a rectangular shape. Thereby, the resistance value of the stator winding can be reduced by increasing the cross-sectional area of the wire, and the output of the rotating electrical machine can be improved.

  The insulating coating described above preferably has an inner layer and an outer layer that covers the outer periphery of the inner layer and has a glass transition temperature lower than that of the inner layer. As a result, the outer layer of the insulating coating is crystallized faster than the inner layer due to the heat generated in the rotating electrical machine, so that the surface hardness of the outer layer is increased and the wire is less likely to be damaged. For this reason, the insulation of the wire which performed the process which forms a step part in a turn part is securable.

  Hereinafter, a stator for a rotating electrical machine according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings. FIG. 1 is a partial perspective view of a stator of a rotating electrical machine according to an embodiment. 2 is a partial perspective view of a wire constituting a stator winding included in the stator shown in FIG. The stator shown in FIG. 1 is used, for example, in a rotating electric machine that also serves as a motor and a generator of a vehicle. This stator accommodates a rotor 60 (see FIG. 7) rotatably on the inner peripheral side. The rotor 60 is formed with a plurality of magnetic poles alternately different in the circumferential direction by permanent magnets on the outer peripheral side facing the inner peripheral side of the stator 10. The stator core 12 is formed in an annular shape by laminating magnetic steel plates having a predetermined thickness in the axial direction. As shown in FIG. 1, the stator core 12 is formed with slots 14 and 15 that are open on the inner circumferential side along the axial direction and are adjacent to each other in the circumferential direction. Adjacent slots 14 and 15 form a set, and a plurality of sets of slots 14 and 15 are arranged at equal intervals in the circumferential direction. The stator winding 20 is, for example, a three-phase winding, and the stator winding 20 of each phase is wound around a pair of slots 14 and 15 adjacent in the circumferential direction. A stator winding 20 of a different phase is wound around each of the three sets of slots 14 and 15 adjacent in the circumferential direction.

  FIG. 3 is a cross-sectional view of the wire 30 forming the stator winding 20. As shown in FIG. 3, the wire 30 forming the stator winding 20 has a rectangular cross-sectional shape, a copper conductor 32, and an inner layer 34 that covers the outer periphery of the conductor 32 and insulates the conductor 32. And an insulating film made of the outer layer 36. The inner layer 34 covers the outer periphery of the conductor 32, and the outer layer 36 covers the outer periphery of the inner layer 34. The thickness of the insulating coating including the inner layer 34 and the outer layer 36 is set between 100 μm and 200 μm. As described above, since the thickness of the insulating coating composed of the inner layer 34 and the outer layer 36 is thick, it is not necessary to insulate by interposing insulating paper or the like between the wire members 30 in order to insulate the wire members 30 from each other.

  The outer layer 36 is made of an insulating material such as nylon. The inner layer 34 is formed of an insulating material such as a thermoplastic resin having a glass transition temperature higher than that of the outer layer 36 or a polyamideimide having a higher glass transition temperature. That is, the outer layer 36 is set to have a glass transition temperature lower than that of the inner layer 34. As a result, the outer layer 36 is crystallized faster than the inner layer 34 due to heat generated in the rotating electrical machine, so that the surface hardness of the outer layer 36 is increased and the wire 30 is less likely to be damaged. For this reason, the insulation of the wire 30 is securable.

  As shown in FIG. 2, the wire 30 includes a slot accommodating portion 40 disposed in the slots 14 and 15 of the stator core 12, and slots that protrude from the slots 14 and 15 to the outside of the stator core 12 and differ in the circumferential direction. And a turn portion 42 that connects the slot accommodating portions 40 arranged on each other, and the stator winding 20 is formed by being wound around the stator core 12. The turn portions 42 are respectively formed on both sides of the axial end surface 13 of the stator core 12. A crank portion 44 that is not twisted is formed at a position that is substantially at the center of the turn portion 42 and farthest from the stator core 12. The crank portion 44 is formed in a crank shape in parallel along the axial end surface 13 of the stator core 12. The amount of shift due to the crank shape of the crank portion 44 is set to be approximately the width of the wire 30. Thereby, the turn parts 42 of the wire 30 adjacent to each other in the radial direction can be densely wound. As a result, since the radial width of the coil end can be reduced, it is possible to prevent the stator winding 20 from protruding outward in the radial direction.

  Further, on the axial end surface 13 of the stator core 12 toward the slots where the wire rods 30 are disposed across all projecting portions of the turn portion 42 projecting out of the stator core 12 from the slots 14 and 15. A step 46 is formed along the line. As shown in FIG. 6, the distance between the protruding portions of the turn part 42 of the wire 30 protruding from the slots 14 and 15, in other words, the length of the bottom side of the triangular part formed by the turn part 42 lies across the wire 30. It is narrower than the interval between the arranged slots. As a result, the height h of the coil end is lowered.

  Further, d1 ≦ d2 is satisfied, where d1 is the length of the stepped portion 46 along the end face 13 of the stator core 12 and d2 is the interval between slots adjacent in the circumferential direction. Thereby, it can prevent that the step part 46 of the wire 30 interferes with the wire 30 which protrudes from the slot adjacent to the circumferential direction. Further, in order to prevent the wire rods 30 protruding from the slots adjacent in the circumferential direction from interfering with each other, it is possible to prevent the coil ends from becoming high or the coil ends from being radially widened. it can. As a result, the height of the coil end is reduced. Furthermore, since the radial width of the coil end can be narrowed, the stator winding 20 can be prevented from projecting radially outward.

  Furthermore, two step portions 48 are respectively formed on the wire 30 between a crank portion 44 at a substantially central portion of the turn portion 42 and a step portion 46 formed at a protruding portion of the turn portion 42. That is, a total of six step portions are formed in the turn portion 42 of the wire 30 on the one axial end face 13 side of the stator core 12. Thereby, the height h of the turn part 42 becomes lower than the height of the triangular turn part 330 (FIG. 6) that does not have a step part. Similarly to the crank portion 44 and the step portion 46, the step shape of the step portion 48 is also formed in a shape along the axial end surface 13 of the stator core 12. Therefore, the turn part 42 of the wire 30 is formed in steps on both sides with the crank part 44 interposed therebetween.

  In the three-phase stator winding 20 described above, each phase wire 30 per pole of the rotor is arranged in two slots 14 and 15. That is, the total number of slots per pole of the rotor 60 of the three-phase stator winding 20 adjacent in the circumferential direction is 3 × 2 = 6. As a result, the wire rods 30 that are arranged across different slots in the circumferential direction are arranged in slots that are separated from each other by six in the circumferential direction. In order to avoid this, it is desirable to form (3 × 2) stepped portions in the turn portion 42. Thus, by forming six step portions in the wire 30 at the coil end on one axial direction side of the stator core 12, the height of the coil end is reduced and the radial width of the coil end is reduced. be able to. When the number of phases of the stator winding 20 is k and the number of slots of each phase per pole of the rotor 60 is t, the desired number of stages of the turn part 42 is generalized (k × t).

  Next, the winding specifications of the stator winding 20 described above will be described with reference to FIGS. 7 to 9, the number of magnetic poles of the rotor 60 and the total number of slots 14 and 15 of the stator core 12 are made smaller than the actual ones in order to simplify the explanation. In each phase, the slots 14 and 15 are set as one set, and as shown in FIG. 8, four sets of slots 14 and 15 are formed in the stator core 12 at intervals of 90 °. Therefore, as shown in FIG. 7, different sets of pairs of slots 14 and 15 are formed on the stator core 12 at intervals of 30 °. In each of the slots 14 and 15, a total of eight slot accommodating portions 40 of the wire rods 30 are arranged. 1 to 4 are attached to the positions where the wire rods 30 are arranged from the radially outer side to the inner side of the slots 14 in each group, and the wire rods 30 are arranged from the radially outer side to the inside of the slots 15 of each group. 5-8 are attached | subjected to the position currently made.

  In the example shown in FIG. 1, a total of twelve slot accommodating portions 40 of the wire 30 are arranged in each of the slots 14 and 15, and six of them have the same circumferential direction. Is shown.

Hereinafter, the winding specifications of the one-phase stator winding 20 will be described with reference to FIG. In FIG. 9, for example, (1-4) represents the wire 30 arranged at the position 4 in # 1 of FIG. 8. As shown in FIG. 9, the wire rods arranged at eight positions of the slots 14 and 15 are first connected in the following positions to form eight groups. The wires at the positions (1-1) and (1-5) are connected to the input unit 50. Further, the one-phase stator winding 20 has two winding ends (4-1) and (4-5) as neutral points 52, respectively. A total of six neutral points 52 of the three-phase stator winding 20 are collected in one place as shown in FIGS. That is, the stator winding 20 is star-connected, and one winding end of each phase is a neutral point 52 and the other winding end is an input unit 50.
(Group 1) (1-1)-(2-2)-(3-1)-(4-2)
(Group 2) (1-2)-(2-1)-(3-2)-(4-1)
(Group 3) (1-3)-(2-4)-(3-3)-(4-4)
(Group 4) (1-4)-(2-3)-(3-4)-(4-3)
(Group 5) (1-5)-(2-6)-(3-5)-(4-6)
(Group 6) (1-6)-(2-5)-(3-6)-(4-5)
(Group 7) (1-7)-(2-8)-(3-7)-(4-8)
(Group 8) (1-8)-(2-7)-(3-8)-(4-7)
And these 8 groups of continuous wires are (1-2) and (4-3), (1-3) and (4-2), (1-4) and (4-8), (1- 6) and (4-7), (1-7) and (4-6), and (1-8) and (4-4) are connected to the neutral point 52 from the input unit 50 shown below. A series of stator wires 20 (# 1) and stator windings 20 (# 2) connected in parallel are formed by continuous wires 30 indicated by dotted lines and solid lines in FIG. Similarly, the other two-phase stator windings 20 each form a pair of stator windings 20 connected in parallel by the continuous wire 30 from the input unit 50 to the neutral point 52. The connection portions 54 of (1-4) and (4-8) and (1-8) and (4-4) shown in FIG. 9 are indicated by the same reference numeral 54 in FIG. 4 and FIG. ing.
・ Stator winding # 1
(Input section)-(Group 1)-(Group 3)-(Group 8)-(Group 6)-(Neutral point)
・ Stator winding # 2
(Input section)-(Group 5)-(Group 7)-(Group 4)-(Group 2)-(Neutral point)
In this way, since a single-phase stator winding is formed from the input portion 50 to the neutral point 52 by the wire 30 continuous over the entire circumference of the stator core 12, a known segment conductor is electrically connected by welding or the like. As compared with the configuration in which the stator winding from the input unit 50 to the neutral point 52 is formed by connecting to the, the number of electrical connection points can be reduced as much as possible. As a result, the manufacturing cost of the stator winding 20 is reduced, and poor electrical connection of the stator winding 20 can be reduced as much as possible.

  Further, since the radial width of the coil end becomes narrow and the coil end does not protrude radially outward, the neutral point 52 can be taken out radially outward of the coil end.

  By the way, as described above, the step portions 46 and 48 are formed in the turn portion 42 of the wire rod 30, and the wire rods 30 are arranged so that these step portions 46 and 48 are substantially in contact with each other. In these step portions 46 and 48, focusing on the insulating coating (inner layer 34 and outer layer 36) around the bent portion, when the step portions 46 and 48 are formed by bending (press forming) a linear wire rod. The insulating coating outside the bent part is reduced. Generally, when the thickness of the insulating coating is 100 to 200 μm, the thickness of the insulating coating outside the bent portion is reduced by about 20 to 30 μm. FIG. 10 is an enlarged view of the bent portions of the step portions 46 and 48. Since the outer radius R1 is larger than the inner radius R2 of the bent portion, the thickness of the insulating film covering the surface of the radius R1 portion is reduced. Thus, when the turn part 42 in which the insulating coating is partially thin is disposed adjacently, corona discharge or the like may occur between the wire 30 in the portion where the insulating coating is thin and the wire 30 adjacent thereto. There is. For this reason, in this embodiment, the recessed part for a width | variety is provided inside the bending part of the step parts 46 and 48, and the distance between the site | parts where the insulating film of the wire 30 became thin is aimed at.

  FIG. 11 is an enlarged view of adjacent step portions. FIG. 12 is a perspective view showing an overlapping state of the respective turn portions of two wire rods adjacent in the circumferential direction. As shown in these drawings, in the present embodiment, the concave portions 41 are formed inside the bent shape for each of the step portions 46 and 48 of the turn portion 42 and the crank portion 44. The concave portion 41 is devised in the shape of a jig used when bending a wire to form a crank shape, that is, a convex portion corresponding to the concave portion 41 is provided on a jig corresponding to the inside of the bent shape. Thus, it is formed simultaneously with the bending process for forming.

  In addition to the shape shown in FIG. 11, the recess 41 has a shape that draws a curve with a larger curvature (smaller R dimension) with respect to the smooth radius R2 inside the bent portion, as shown in FIG. It may be 410. Further, all of the concave portions 410 are not curved surfaces, and may have a flat portion in the middle.

  Further, the depth of the concave portion 410 (same for 41) is defined as a distance d between the virtual curve having the radius R2 and the concave portion 410, as shown in FIG. This depth is set to 50 μm or less. Desirably, the depth of the recess 41 is set in the range of 30 to 50 μm, considering that the thickness of the insulating coating on the outer surface 43 of the bent portion is reduced by about 20 to 30 μm. Since the thickness of the insulating coating outside the bent portion is reduced by about 20 to 30 μm, even if the depth of the recess is set to 50 μm or less, the interval between the reduced thickness wires can be enlarged. Moreover, since the cross-section reduction | decrease of a wire is hardly carried out by making the depth of a recessed part into 50 micrometers or less, the increase in the resistance value of the stator coil | winding 20 can be suppressed.

  In this way, by forming the concave portion 41 inside the stair-shaped bent portion of the wire 30, when the same shape of the wire 30 is arranged in an overlapping manner, the outside of the stair-shaped bent portion of the other adjacent wire 30. The distance between the wire 30 and the portion where the insulating coating becomes thinner can be ensured, and the insulation performance can be improved by preventing the deterioration of the insulation due to the occurrence of corona discharge or the like. Further, the protruding portion where the turn portion 42 of the wire 30 connecting the slot accommodating portions 40 of the wire 30 outside the slot protrudes from the slot is stepped toward the slots where the wire 30 is disposed. Therefore, the interval between the protruding portions of the turn portion 42 is narrower than the interval between the slots in which the wire rods 30 are arranged, and the shape of the wire rods 30 protruding from the stator core 12 is reduced as a whole. Thus, the height of the coil end can be reduced.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the above-described embodiment, as shown in FIG. 2, in addition to the step portion 46 along the axial end surface 13 of the stator core 12 and the crank portion 44 at the substantially central portion, the turn portion 42 of the wire rod 30 has 4 portions. Although the step portions 48 are formed at the locations, the number of the step portions 48 may be reduced.

  Further, in the above-described embodiment, the concave portion 41 inside the bent portion of the step portion is formed at the same time when the wire 30 is bent into a staircase shape, but may be added in a post process separately from the bending step. . Further, in the example shown in FIG. 12, the concave portions 41 are formed inside the bent portions of all the step portions, but only when the outer surface 43 of the bent portion of the step portion of the other wire corresponds to the adjacent portion. The recess 41 may be formed.

  In the embodiment described above, the stator of a rotating electrical machine that also serves as an electric motor and a generator has been described. However, the present invention is also applied to a stator of a rotating electrical machine that has only one function of an electric motor or a generator. can do.

  In the above-described embodiment, the crank portion 44 along the radial direction without twisting is formed at the substantially central portion of the turn portion 42 of the wire 30, but the position of the crank portion 44 may be shifted from the central portion. Further, the present invention may be applied to a stator having a stator winding of delta connection without being limited to the star winding stator winding.

It is a fragmentary perspective view of the stator of the rotary electric machine of one Embodiment. It is a partial perspective view of the wire which comprises the stator coil | winding contained in the stator shown in FIG. It is sectional drawing of the wire which forms the stator winding | coil. It is a partial perspective view of the stator of this embodiment. It is a partial perspective view of a stator. It is a schematic diagram which shows the shape of the turn part of a wire. It is a schematic diagram which shows the structure of the magnetic pole of the rotor of a rotary electric machine, and the slot of a stator. It is explanatory drawing which shows arrangement | positioning of the slot per phase. It is a winding specification figure per phase. It is an enlarged view of the bending part of a step part. It is an enlarged view of an adjacent step part. It is a perspective view which shows the overlap state of each turn part of two wire rods adjacent to the circumferential direction. It is a figure which shows the modification of a recessed part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stator 12 Stator core 13 Axial direction end face 14, 15 Slot 20 Stator winding 30 Wire material 32 Conductor 40 Slot accommodating part 41 Recess 42 Turn part 44 Crank part 46, 48 Step part 50 Input part 52 Neutral point 54 Connection Part 60 rotor

Claims (12)

In a stator of a rotating electrical machine comprising a stator core having a plurality of slots in the circumferential direction, and a stator winding formed of a wire and installed in the slot,
The stator winding has a slot accommodating portion accommodated in the slots having different circumferential directions, and a turn portion connecting the slot accommodating portions to each other outside the slot,
A step portion along an end surface of the stator core is formed on the turn portion protruding from the slot,
A stator of a rotating electrical machine having a recess inside a bent portion of the stepped portion.   2. The stator of a rotating electrical machine according to claim 1, wherein stepped portions along end faces of the stator core are formed at all projecting portions of the turn portion projecting from the slot.   The stator of a rotating electrical machine according to claim 1, wherein the recess is formed by a width of the wire.   The wire has a conductor and further has an insulating film covering an outer periphery of the conductor, the insulating film has a thickness of 100 to 200 μm, and the depth of the recess is 50 μm or less. The stator of the rotating electrical machine according to any one of 1 to 3.   The stator of the rotating electrical machine according to claim 4, wherein the turn part has a crank part formed in a crank shape at a position farthest from the stator core.   The stator for a rotating electrical machine according to claim 5, wherein the crank portion is formed in parallel to an end face of the stator core.   The stator of the rotating electrical machine according to claim 5 or 6, wherein the crank portion is displaced in a radial direction of the stator core by a width of the wire.   When the number of phases of the stator winding is k and the number of slots of each phase per pole of the rotor is t, the total of the step portions formed in the turn portion is (k × t). The stator for a rotating electrical machine according to any one of claims 1 to 7, wherein the stator is provided.   9. The length of the projecting portion of the turn portion along the axial end surface of the stator core is equal to or shorter than the interval between the slots adjacent to each other in the circumferential direction. A stator for a rotating electrical machine according to claim 1.   The stator for a rotating electrical machine according to any one of claims 1 to 9, wherein the wire is formed continuously over the entire circumference of the stator core.   The stator of the rotating electrical machine according to any one of claims 1 to 10, wherein the wire has a rectangular cross-sectional shape.   The fixing of a rotating electrical machine according to any one of claims 1 to 11, wherein the insulating coating includes an inner layer and an outer layer that covers an outer periphery of the inner layer and has a glass transition temperature lower than that of the inner layer. Child.

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