JP2010239740A - Armature for rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an armature for a rotating electric machine, facilitating installation of an interphase insulator. <P>SOLUTION: The armature for a rotating electric machine includes interphase insulators 60 which are attached on each phase crossing portion 28B having a portion superimposed on a different phase crossing portion 28B in a circumferential direction C and disposing the superimposed portion oppositely to a diameter direction R, where each-phase crossing portions 28B are aligned and arranged in the diameter direction R and the circumferential direction C and formed as an aligned coil end portion 29A, and each have a diameter direction outside insulation portion 60a for covering a portion superimposed over a different phase crossing portion 28B in the circumferential direction C in the outside surface of the diameter direction R of the crossing portion 28B, a diameter direction inside insulation portion 60b for covering the a portion superimposed over a different phase crossing portion 28B in the circumferential direction C in the outside surface of the diameter direction R of the crossing portion 28B, a circumferential direction insulation portion 60c for connecting the insulation portion 60a to the insulation portion 60b and covering the circumferential direction one end portion of the crossing portion 28B, and an axial direction insulation portion 60d for connecting the insulation portion 60a to the insulation portion 60b and covering the axial direction outside end portion of the crossing portion 28B. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an armature for a rotating electrical machine including an interphase insulator for securing interphase insulation between a plurality of phase coils.

  In a rotating electrical machine such as a motor (electric motor), a generator (generator), and a motor / generator that functions as both a motor and a generator as required, an armature is provided to create a rotating magnetic field. As one of general armatures for rotating electrical machines, a cylinder having a plurality of axially extending slots dispersed in the circumferential direction and an inner circumferential opening in which each slot opens radially inward And a multi-phase coil wound in a distributed winding form in a plurality of slots. In general, a thin conductor is used as the coil material. For example, when a U-phase, V-phase, and W-phase coil is wound around a core, a plurality of in-phase conductors are wound around each slot and drawn out at both ends in the axial direction of the core. It is bundled as a transition part. In the armature for a rotating electrical machine having such a configuration, since there are transition portions of the coils of a plurality of phases at both ends in the axial direction of the core, it is necessary to provide an interphase insulator for ensuring insulation between different phases of the transition portions. There is.

  In the armature for a rotating electrical machine described in Patent Document 1, the transition portions of the respective phases protruding in the axial direction from the core are arranged side by side in the radial direction and the circumferential direction of the core. And the interphase insulator is provided in order to ensure the insulation between different phases about the transition part of each phase. Specifically, as shown in FIGS. 2A, 4 and 5 of Patent Document 1, interphase insulators (interphase insulating paper 8) are arranged adjacent to each other in the radial direction. Between the transition parts of a different phase, it is provided with the cylindrical shape extended along an axial direction over the whole circumferential direction of a core. At this time, in order to lengthen the creepage distance between the different phases, the protruding length of the interphase insulator from the core to the outside in the axial direction is longer than the protruding length of the crossover portion. Moreover, the transition part of each phase, the interphase insulator for interphase insulation, and the like are fastened to each other with an insulating thread and then fixed with a varnish.

JP 2008-131749 A

Since the interphase insulator for interphase insulation described in Patent Document 1 protrudes outward in the axial direction from the crossover portion, the armature for the rotating electrical machine becomes longer in the axial direction. As a result, the electrical machine for the rotating electrical machine There is a problem that the child cannot be miniaturized.
Moreover, in patent document 1, since the position of the interphase insulator inserted between the transition parts is unstable, in order to fix the position of the interphase insulator in a form capable of appropriately performing interphase insulation, a varnish is used. As described above, it is necessary to perform complicated construction such as binding with a binding thread before fixing.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an armature for a rotating electrical machine including an interphase insulator that can reduce the size of the armature for a rotating electrical machine and facilitate the construction of interphase insulation. There is in point to do.

In order to achieve this object, the characteristic configuration of the armature for a rotating electrical machine provided with an interphase insulator for ensuring interphase insulation between coils of a plurality of phases according to the present invention is wound around a substantially cylindrical core. In the coil, at least one end protruding in the axial direction from the core extends in the circumferential direction so as to connect between the coil sides of the same phase arranged at different circumferential positions, and has a shape protruding in the axial direction. A transition portion is provided for each phase, and when the transition portion of each phase is an aligned coil end portion that is aligned and arranged in the radial direction and the circumferential direction, part of the transition portion and the circumferential direction in a different phase Are attached to the transition portions of the phases arranged so that the overlapping portions are opposed to each other in the radial direction, and overlap in the circumferential direction with the transition portions of different phases on the radially outer surface of the transition portion. A radially outer insulating portion that covers a portion, a radially inner insulating portion that covers a portion overlapping the circumferential portion and the connecting portion of a different phase on the radially inner side surface of the connecting portion, the radially outer insulating portion, and the diameter A circumferential one-side insulating portion that covers a circumferential one-side end portion of the crossing portion by connecting a directional inner insulating portion; and the radial outer insulating portion and the radial inner insulating portion to connect a shaft of the crossing portion It is in the point provided with the interphase insulator which has an axial direction outer side insulation part which covers a direction outer side edge part.
In the present application, the directions of “axial direction”, “radial direction”, and “circumferential direction” are determined based on a substantially cylindrical core. At this time, each direction about a coil shall prescribe | regulate as a direction in the state by which the coil was wound by the slot. In addition, the “rotary electric machine” is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that functions as both a motor and a generator as necessary.

According to the above characteristic configuration, since the outer end portion in the axial direction of the crossing portion is covered with the interphase insulator, it is not necessary to secure the creeping distance by extending the interphase insulator outward in the axial direction as in the prior art. In addition, the interphase insulation between the axially outer end portion of the transition portion and the transition portion of the other phase is ensured. That is, the protruding length of the interphase insulator from the core outward in the axial direction only needs to be long enough to cover the axially outer end of the transition portion. Therefore, the projecting length of the interphase insulator from the core outward in the axial direction can be shortened, and accordingly the axial length of the armature for a rotating electrical machine can be shortened. In addition, since the interphase insulator covers the circumferentially one side end portion of the crossover portion and the portion facing the crossover portion of the different phase in the radial direction, the insulation between the phases can be obtained without covering the entire crossover portion. Can be secured. Therefore, the amount of interphase insulator can be reduced.
Furthermore, the shape of the interphase insulator is a so-called crossover covering a part of the radially outer side, a part of the radially inner side, a circumferential one side end, and an axially outer end. It is a hood shape. Then, since the interphase insulator can be mounted by covering the cross-shaped interphase insulator on each crossover portion, the construction of the interphase insulation is facilitated.
Therefore, the armature for rotating electrical machines can be provided that includes the interphase insulator that can reduce the size of the armature for rotating electrical machines and can easily perform the interphase insulation.

  Further, the interphase insulator is arranged such that, in the aligned coil end portion, the end portion in the circumferential direction in the transition portion of the other phase extends from the one circumferential end portion in the transition portion of each phase to the middle portion in the circumferential direction. To the intermediate portion in the circumferential direction, and the crossover portion is arranged so that the overlapping portions are opposed to each other in the radial direction, and the radially outer insulating portion and the radially inner insulating portion are the crossover portion. It is preferable that the configuration is configured to cover from the one end in the circumferential direction to the middle portion in the circumferential direction.

  According to this structure, the radial direction outer side insulation part and radial direction inner side insulation part of an interphase insulator cover from the circumferential direction one side edge part to the circumferential direction intermediate part in a transition part. That is, the insulation between each phase is securable because an interphase insulator covers the half of the circumferential direction of a crossover part.

  The interphase insulator is preferably formed by folding a substantially rectangular sheet-like insulating material in two and joining the side portions adjacent to one end side of the bent portion.

  According to this configuration, since the interphase insulator can be manufactured using one sheet of insulating material, the cost required for manufacturing the interphase insulator can be reduced.

  In addition, the armature for a rotating electrical machine includes a three-phase coil including a first phase, a second phase, and a third phase, and a plurality of the transition portions of the first phase and a plurality of the third phases. Are arranged at different positions in the radial direction and are shifted in the circumferential direction so as to overlap by approximately half the length in the circumferential direction. The intermediate portion in the direction has a radial step portion, and the one side portion in the circumferential direction with respect to the step portion of the transition portion of the second phase is one of the transition portions of the first phase and the third phase. Are arranged at the same position in the radial direction and are arranged so as to overlap with the other of the first phase and the third phase in the circumferential direction, and in the circumferential direction with respect to the stepped portion of the transition portion of the second phase The other side portion is disposed at the same position in the radial direction as the other transition portion of the first phase and the third phase, and the front side The first phase and the third phase are arranged so as to overlap in the circumferential direction, and the interphase insulator has a circumferential length of the radially outer insulating portion and the radially inner insulating portion that is the second phase. It is preferable that the length of the crossing portion of the phase is not less than the length from the one end in the circumferential direction to the stepped portion.

  According to this configuration, the interphase insulator covers the step portion of the second phase. Therefore, even if the transition part of the second phase is close to the transition part of the first phase and the transition part of the third phase around the stepped part, the insulation between the phases is ensured.

It is sectional drawing which shows the whole structure of a rotary electric machine. It is a perspective view which shows the whole structure of a stator. (A) is a plan view of a part of the stator core, and (b) is a partial cross-sectional view illustrating a state in which a coil is wound around the stator core. It is a perspective view which shows the coil of the U phase wound around a stator core. It is a perspective view which shows the coil of V phase wound around a stator core. It is a perspective view which shows the coil of W phase wound around a stator core. It is a top view of the coil end part by the side connected with a lead wire. It is a side view of the coil end part by the side connected with a lead wire. It is a figure which shows typically the arrangement | positioning state seen from the axial direction of the transition part of each phase in the coil end part by the side connected with a lead wire. It is a perspective view explaining the process of inserting the coil of each phase into a stator core. (A) is a perspective view of an interphase insulator, (b) is an expanded view of an interphase insulator. It is a figure which shows typically the arrangement | positioning state seen from the axial direction of the transition part of each phase at the time of mounting | wearing with an interphase insulator. It is a perspective view of the stator which illustrates the state where the interphase insulator was attached to the transition part. It is a perspective view of the stator which illustrates the state where the interphase insulator was attached to the transition part. It is a perspective view of the interphase insulator of another embodiment.

An embodiment of an armature for a rotating electrical machine including an interphase insulator for ensuring interphase insulation between a plurality of phase coils according to the present invention will be described with reference to the drawings. In this embodiment, first, the configuration of the armature for a rotating electrical machine in which the interphase insulator is not provided will be described, and then the armature for a rotating electrical machine according to the present invention in the form in which the interphase insulator is provided will be described. The configuration will be described.
FIG. 1 is a cross-sectional view showing the overall configuration of the rotating electrical machine, and FIG. 2 is a perspective view showing the overall configuration of the stator. FIG. 3A is a plan view of a part of the stator core, and FIG. 3B is a partial cross-sectional view illustrating a state where a coil is wound around the stator core.

1. As shown in FIG. 1, the rotating electrical machine 1 includes a stator 2, a rotor 3, and a case 5. The stator 2 includes a coil 21, and a magnetic field can be generated by passing a current through the coil 21. In the present embodiment, the stator 2 corresponds to the “armature for rotating electrical machine” in the present invention. The stator 2 is fixed to the inner peripheral surface of the case 5. The configuration of the stator 2 will be described in detail later. Further, on the radially inner side of the stator 2, a rotor 3 as a magnetic field having a permanent magnet (not shown) is disposed so as to be relatively rotatable with respect to the stator 2 with the rotor shaft 4 as a rotation axis. Yes. That is, the rotating electrical machine 1 in this embodiment is an inner rotor type rotating electrical machine including a stator 2 as an armature. The case 5 is formed in a cylindrical shape in which an end wall 5a is provided at one end in the axial direction. The case 5 opens to the other end side in the axial direction, and a cover 6 is attached to the case 5 so as to close the opening. And the bearing 7 is provided in the radial direction center part of the end wall 5a of the case 5 and the cover 6, and the rotor 3 and the rotor shaft | axis 4 are rotatably supported with respect to the case 5 and the cover 6 via the bearing 7. FIG. ing.

2. Configuration of Stator As shown in FIGS. 2 and 3, the stator 2 includes a stator core 11 and a coil 21. The stator core 11 is formed by laminating a plurality of hollow disc-shaped electromagnetic steel plates, and is formed in a substantially cylindrical shape. A plurality of slots 12 extending in the axial direction L are distributed in the circumferential direction C on the inner peripheral surface of the stator core 11. In addition, each slot 12 has an inner peripheral opening 13 that opens inward in the radial direction: R1. In the present embodiment, the stator core 11 corresponds to a “core” in the present invention. Each slot 12 has the same cross-sectional shape as each other, and has a predetermined circumferential width and radial depth. In the present embodiment, the stator core 11 is provided with a total of 48 slots 12 on the entire circumference thereof. In the present embodiment, the coil 21 is constituted by a linear conductor 31 using a single rectangular conducting wire having a substantially rectangular cross section.

  As shown in FIG. 3A, teeth 15 are provided between slots 12 (U-phase slot 12u, V-phase slot 12v, and W-phase slot 12w) adjacent to each other of stator core 11. Protrusions 16 projecting in the circumferential direction are provided at both ends in the circumferential direction of the teeth 15 at the radially inner end of the teeth 15. In the present embodiment, the protruding portion 16 is formed integrally with the teeth 15 so that the cross-sectional shape orthogonal to the axial direction is substantially rectangular and is continuous in the axial direction. And the inner peripheral opening part 13 is formed between the two protrusion parts 16 provided in each of the adjacent two teeth 15 and facing in the circumferential direction. Further, a space radially outward from the inner peripheral opening 13 in the slot 12 is a slot interior 14.

  As described above, the inner peripheral opening 13 is formed between the two protruding portions 16 provided in each of the two adjacent teeth 15 and facing each other in the circumferential direction. Therefore, the slot 12 of the stator core 11 in the present embodiment is a semi-open slot in which the circumferential width W1 of the inner circumferential opening 13 that opens radially inward is narrower than the circumferential width W3 of the slot interior 14. It has become. A linear conductor 31 constituting the coil 21 is disposed inside the slot 14, and the coil 21 is wound around the slot 12. At this time, an in-slot insulating sheet (not shown) is disposed between the slot 12 and the coil 21.

  The stator 2 includes a plurality of coils 21 having different phases. In the present embodiment, the stator 2 is a stator used in the rotating electrical machine 1 driven by three-phase alternating current. Therefore, the stator 2 has a U-phase, V-phase, and W-phase three-phase coil 21 wound in the form of distributed winding in the plurality of slots 12 (“first phase, second phase, third phase” in the present invention). In this embodiment, in order to maximize the space factor of the coil 21 in relation to the size of the slot 12, the circumference of the linear conductor 31 constituting the coil 21 is provided. The direction width W5 is formed to be substantially equal to the circumferential width W3 of the slot interior 14. More specifically, the circumferential width W5 of the linear conductor 31 is formed using the linear conductor 31. Under the precondition that the coil 21 can be physically inserted into the slot interior 14, it is set to a value substantially equal to the circumferential width W3 of the slot interior 14. This improves the space factor of the coil 21. Energy efficiency of the rotating electrical machine 1 As described above, in the present embodiment, the slot 12 of the stator core 11 is a semi-open slot, and the circumferential width W1 of the inner circumferential opening 13 is the circumferential width of the slot interior 14. Therefore, the circumferential width W5 of the linear conductor 31 having a circumferential width substantially equal to the circumferential width W3 of the slot interior 14 is wider than the circumferential width W1 of the inner circumferential opening 13 of the slot 12. Therefore, in the present embodiment, the radial conductor portion 25 of the bent coil end portion 24 in each coil 21 has a circumferential width W7 of the circumferential width of the inner circumferential opening 13 of the slot 12. It is set as the structure provided with the narrow recessed part 32 narrower than W1.

2.1 Coil Configuration Next, the coils 21 (21u, 21v, 21w) of each phase will be described.
4 is a perspective view showing a U-phase coil wound around the stator core, FIG. 5 is a perspective view showing a V-phase coil wound around the stator core, and FIG. 6 is a perspective view showing W wound around the stator core. It is a perspective view which shows the coil of a phase. FIG. 7 is a plan view of the coil end portion on the side connected to the lead wire. FIG. 8 is a side view of the coil end portion on the side connected to the lead wire. FIG. 9 is a diagram schematically showing an arrangement state of each phase transition portion on the coil end portion side where the lead wire is provided, as viewed from the axial direction. As described above, since the purpose is to explain the configuration of the coil 21, the interphase insulator is not shown.

  4 shows a U-phase coil 21u, FIG. 5 shows a V-phase coil 21v, and FIG. 6 shows a W-phase coil 21w. In the present embodiment, each phase coil 21 (21u, 21v, 21w) is formed in a substantially cylindrical corrugated shape as a whole, as shown in FIGS. The coils 21 (21u, 21v, 21w) of each phase have both ends in the axial direction L of the stator core 11 between the coil side portions 22 arranged in the slot 12 and the pair of coil side portions 22 arranged in different slots 12. And a coil end portion 23 connected at the portion. The coil side portions 22 are linearly formed so as to extend along the axial direction L corresponding to the shape of the slot interior 14.

The coil end portion 23 connects between a pair of coil side portions 22 arranged in different slots 12 to form a crossing portion 28A, 28B having a shape extending in the circumferential direction C and protruding in the axial direction L. . That is, as shown in FIGS. 4 to 6, the coil 21 extends in the axial direction L and is sequentially disposed in the plurality of slots 12. (Coil end portion 23, alignment coil end portion 29A) and the other axial end side: L1 side transition portion 28A (coil end portion 23, bent coil end portion 24) are alternately connected, and the circumferential direction of stator core 11 It is formed in a waveform that circulates around C. As described above, the coils 21 of the respective phases are formed in advance so as to have a shape that is wound around the stator core 11 by wave winding in a state in which the coil side portions 22 are respectively disposed in the corresponding slots 12. .
As shown in FIGS. 4 to 6, the bent coil end portion 24 is bent at the bent portion 34 toward the R1 side in the radial direction substantially perpendicular to the coil side portion 22. The coil end portion 23 of each phase constituting the bent coil end portion 24 includes a radial conductor portion 25 that is bent from the coil side portion 22 disposed in each slot 12 and extends in the radial direction R, and an inner peripheral opening portion. Radial inward side than 13: a circumferential conductor portion 26 extending in the circumferential direction C so as to connect the pair of radial conductor portions 25 on the R1 side.

  In the present embodiment, the coil 21 is formed as a set of two coil side portions 22 arranged in the same slot 12. The set of two coil side portions 22 is formed by circulating a single continuous linear conductor 31 in the circumferential direction C of the stator core 11. In addition, two sets of two coil side portions 22 constituting the in-phase coil 21 are arranged in parallel in the circumferential direction C so as to be arranged in the slots 12 adjacent to each other. The two sets of coil side portions 22 are connected so as to be continuous at a predetermined position of the coil end portion 23. Therefore, the coil 21 shown in FIG. 4 to FIG. 6 is formed by circulating a single continuous linear conductor 31 in the circumferential direction C of the stator core 11 four times. In the present embodiment, three sets of coils 21 having substantially the same shape as that shown in FIGS. 4 to 6 are arranged adjacent to each other in the radial direction R in the same slot 12. Therefore, for each of the two adjacent slots 12, the six coil side portions 22 are arranged in a line in the radial direction R in the slot 12.

  As shown in FIG. 3B, the stator core 11 has two U-phase slots 12u adjacent to each other, two V-phase slots 12v adjacent to each other, and two W-phase slots 12w adjacent to each other sequentially. It is formed repeatedly. Each of the coil side portions 22 of the U-phase coil 21u, V-phase coil 21v, and W-phase coil 21w having the shape shown in FIGS. 4 to 6 is sequentially shifted by two slots in the circumferential direction C. They are arranged in the slot 12u, the V-phase slot 12v, and the W-phase slot 12w.

2.2 Configuration of Aligned Coil End Part As shown in FIGS. 4 to 9, at least one axial side projecting from the stator core 11 in the axial direction L among the coils 21 of each phase: the transition part 28 </ b> B on the L2 side (coil The end portion 23) is an aligned coil end portion 29A that is aligned in the radial direction R and the circumferential direction C. Moreover, a part of the crossover part 28B is a connection part 29B with the lead wire. A part of the connection portion 29B is routed on the outside L2 side in the axial direction of the alignment coil end portion 29A.

  As shown in FIG. 7 and FIG. 9, the alignment coil end portion 29A is configured as a set of U-phase, V-phase and W-phase transition portions 28B (coil end portions 23), and a plurality of sets (three in this embodiment). Alignment coil end portions 29A of the set) are arranged side by side in the radial direction R. Specifically, a pair of aligned coil end portions 29A is constituted by the U-phase, V-phase, and W-phase transition portions 28B of the first and second layers from the top in FIG. In addition, another set of aligned coil end portions 29A is configured by the U-phase, V-phase, and W-phase transition portions 28B of the third and fourth layers. Furthermore, another set of aligned coil end portions 29A is constituted by the U-phase, V-phase, and W-phase transition portions 28B of the fifth and sixth layers.

2.2 (1) Alignment coil end portion of V-phase coil Focusing on a set of alignment coil end portions 29A, the transition portion 28B of the V-phase coil 21v is such that the linear conductor 31 is on the radially outer side: R2 side. An outer side portion (circumferential one side end portion 28Ba) aligned adjacent to the axial direction L and the circumferential direction C and the linear conductor 31 are radially inward: the axial direction L and the circumferential direction on the R1 side. An inner side portion (circumferential other side end portion 28Bb) aligned adjacent to C and a step portion (circumferential intermediate portion 28Bc) between the outer side portion 28Ba and the inner side portion 28Bb. .
Specifically, the transition portion 28 </ b> B in the V-phase coil end portion 23 has a stepped portion 28 </ b> Bc bent in the radial direction R at an intermediate portion in the circumferential direction C. In addition, the transition portion 28B in the V-phase coil end portion 23 includes an inner side portion 28Bb positioned on the other circumferential side of the stepped portion 28Bc: the C1 side and the radially inner side: the R1 side, and a stepped portion. It has an outer side portion 28Ba located on the one side in the circumferential direction from 28Bc: the C2 side and the radially outer side: the R2 side.

  Further, as shown in FIG. 5, in the outer side portion 28Ba of the transition portion 28B in the V-phase coil end portion 23, the four linear conductors 31 are aligned on the radially outer side: R2 side, In the side portion 28Bb, the four linear conductors 31 are aligned on the radially inner side: R1 side. More specifically, in the outer side portion 28Ba of the crossover portion 28B, the two linear conductors 31 of the V-phase coil 21v on the radially inner side of the slot 12: the R1 side are external to the stator core 11 in the axial direction L. After being drawn out, it is adjacent in the circumferential direction C and the axial direction L to the two linear conductors 31 of the V-phase coil 21v drawn out of the stator core 11 from the radially outer side of the slot 12 to the outside of the stator core 11. And bent radially outward: R2 side. Further, in the inner side portion 28Bb of the crossover portion 28B, the two linear conductors 31 of the V-phase coil 21v on the radially outer side of the slot 12: R2 side are drawn out to the outside in the axial direction L of the stator core 11. Then, in the radial inner side of the slot 12: adjacent to the two linear conductors 31 of the V-phase coil 21v drawn out of the stator core 11 from the R1 side in the circumferential direction C and the axial direction L. Bent radially inward: R1 side so as to align.

2.2 (2) Alignment coil end portion of U-phase coil Focusing on a set of alignment coil end portions 29A, the connecting portion 28B of the U-phase coil 21u is such that the linear conductor 31 is on the radially outer side: R2 side. Aligned axially and circumferentially adjacent.
Specifically, the transition portion 28B in the U-phase coil end portion 23 is adjacent to the radially outer side: R2 side with respect to the inner side portion 28Bb of the V-phase transition portion 28B, and the V-phase It arrange | positions adjacent to the circumferential direction C with respect to outer side part 28Ba of the transition part 28B. That is, a part of the transition part 28B of the U-phase coil 21u (one side in the circumferential direction of the U-phase coil 21u: a part on the C2 side) is a part of the transition part 28B of the V-phase coil 21v (the circumferential direction of the V-phase coil 21v). The other side: the portion on the C1 side) overlaps with the circumferential direction C and faces the radial direction R.

  As shown in FIG. 4, the four linear conductors 31 are aligned on the radially outward side: R2 side in the transition portion 28B in the U-phase coil end portion 23. More specifically, in the aligned coil end portion 29A of the U-phase coil 21u, the two linear conductors 31 on the radially inner side of the slot 12: the R1 side are drawn to the outside in the axial direction L of the stator core 11. Then, radially outward of the slot 12: aligned with the two linear conductors 31 of the U-phase coil 21u drawn from the R2 side to the outside of the stator core 11 in the circumferential direction C and the axial direction L. Thus, it is bent to the radial direction outward side: R2 side.

2.2 (3) Alignment coil end portion of W-phase coil Focusing on a set of alignment coil end portions 29A, the transition portion 28B of the W-phase coil 21w is such that the linear conductor 31 is on the radially inner side: R1 side. Aligned axially and circumferentially adjacent.
Specifically, the transition portion 28B in the W-phase coil end portion 23 is adjacent to the outer side portion 28Ba of the V-phase transition portion 28B in the radial inner side: R1 side, and the V-phase It arrange | positions adjacent to the circumferential direction C with respect to the inner side part 28Bb of the transition part 28B. That is, a part of the transition part 28B of the W-phase coil 21w (the other side in the circumferential direction of the W-phase coil 21w: a part on the C1 side) is a part of the transition part 28B of the V-phase coil 21v (the circumferential direction of the V-phase coil 21v). One side: the portion on the C2 side) and the circumferential direction C and opposite to the radial direction R.

  As shown in FIG. 6, in the transition portion 28 </ b> B in the W-phase coil end portion 23, the four linear conductors 31 are aligned on the radially inner side: R <b> 1 side. More specifically, in the aligned coil end portion 29A of the W-phase coil 21w, the two linear conductors 31 on the radially outer side of the slot 12: the R2 side are drawn to the outside in the axial direction L of the stator core 11. Afterward, radially inward of the slot 12: aligned with the two linear conductors 31 of the W-phase coil 21w drawn from the R1 side to the outside of the stator core 11 in the circumferential direction C and the axial direction L. In this way, it is bent radially inward: R1 side.

2.3 Positional relationship of U-phase, V-phase, and W-phase aligned coil end portions As shown in FIG. 9, the transition portion 28B of the U-phase coil 21u and the transition portion 28B of the W-phase coil 21w are arranged in the radial direction R. They are arranged at different positions and are shifted in the circumferential direction C so as to overlap in the circumferential direction C by approximately half the length (that is, opposite to the radial direction R). Then, a portion on one side in the circumferential direction: C2 side with respect to the step portion (circumferential intermediate portion 28Bc) of the transition portion 28B of the V-phase coil 21v is located at the same position in the radial direction R as the transition portion 28B of the U-phase coil 21u. It arrange | positions so that it may overlap with the transition part 28B of the W-phase coil 21w and the circumferential direction C (namely, it opposes radial direction R). The portion on the other side in the circumferential direction: C1 side with respect to the step portion (circumferential intermediate portion 28Bc) of the transition portion 28B of the V-phase coil 21v is disposed at the same position in the radial direction R as the transition portion 28B of the W-phase coil 21w. In addition, they are arranged so as to overlap the crossing portion 28B of the U-phase coil 21u in the circumferential direction C (that is, facing the radial direction R).

  That is, as shown in FIG. 7 and FIG. 9, focusing on the radial direction R of the transition portion 28B of each phase, from the circumferential one side (C2 side) end portion 28Ba of the transition portion 28B of each phase. Up to 28Bc overlaps in the circumferential direction C from the other circumferential side (C1 side) end portion 28Bb to the circumferential intermediate portion 28Bc in one of the other two phases 28B, and the overlapping portion is the radial direction R. It is arrange | positioned so that it may oppose. In addition, the circumferential direction other side (C1 side) end portion 28Bb to the circumferential direction intermediate portion 28Bc in the transition portion 28B of each phase is surrounded by the other circumferential direction one side (C2 side) end portion 28Ba of the other two phases. It overlaps with the direction intermediate part 28Bc and the circumferential direction C, and it arrange | positions so that the overlapping part may oppose radial direction.

3. Assembling Method of Stator FIG. 10 is a perspective view for explaining a process of inserting coils of each phase into the stator core. As shown in the figure, the coil 21 is connected to the slot 12 from the side of the bent coil end portion 24 in a state where the narrow concave portion 32 in the radial conductor portion 25 and the inner peripheral opening portion 13 of the slot 12 included in the stator core 11 correspond to each other. It is inserted in the axial direction L.
Specifically, the coils 21 of each phase are formed in advance so that each coil side portion 22 has a wave shape that can be disposed in the corresponding slot 12. Thus, by forming the coils 21 of the respective phases in a predetermined shape in advance, the coils 21 can be easily inserted into the slots 12 in the axial direction L. At this time, in the present embodiment, as shown in FIG. 10, the U-phase, V-phase, and W-phase coils 21 are combined to form one unit, and each coil side portion 22 corresponds to the corresponding slot 12. The unit is integrally inserted into the slot 12 in a state of being aligned so as to be disposed in the slot 12.

4). Configuration of Interphase Insulator FIG. 11A is a perspective view of an interphase insulator, and FIG. 11B is a development view of the interphase insulator. As shown in the drawing, the interphase insulator 60 is formed by folding a substantially rectangular sheet-like insulating material into two at the bent portion 62 and joining the side portion 61 adjacent to one end side of the bent portion 62. As the material of the interphase insulator 60, a sheet formed of a material having high electrical insulation and heat resistance, such as a resin sheet or paper material, for example, a laminate of aramid fiber and polyethylene terephthalate can be used. The formed interphase insulator 60 includes a radially outer insulating portion 60a, a radially inner insulating portion 60b, a circumferential one-side insulating portion 60c, and an axially outer insulating portion 60d. The portion of the bent portion 62 constitutes the axially outer insulating portion 60d, and the portion of the side portion 61 to be joined constitutes the circumferential one side insulating portion 60c. In a state where the interphase insulator 60 is mounted on the transition portion 28B of each phase, the radially outer insulating portion 60a is arranged in the circumferential direction C with the transition portion 28B of the different phase on the radially outer side of the transition portion 28B: the R2 side surface. Covering overlapping (ie, radially opposing) portions. The radially inner insulating portion 60b covers a portion overlapping in the circumferential direction (that is, facing the radial direction) with the transition portion 28B of a different phase on the radially inner side of the transition portion 28B: the surface on the R1 side. The one circumferential side insulating portion 60c connects the radially outer insulating portion 60a and the radially inner insulating portion 60b to cover the end portion on the circumferential side one side: C2 side of the crossover portion 28B. The axially outer insulating part 60d connects the radial outer insulating part 60a and the radial inner insulating part 60b and covers the end part on the L2 side of the crossing part 28B in the axially outer side.

  FIG. 12 is a diagram schematically illustrating an arrangement state of each phase transition portion in the alignment coil end portion viewed from the axial direction when the interphase insulator is attached. FIG. 13 and FIG. 14 are perspective views of the stator illustrating the state in which the interphase insulator is attached to the transition portion. FIG. 13 shows an example in which the interphase insulator 60 is attached to a specific W-phase coil 21w so that the manner of attaching the interphase insulator 60 to the transition portion 28B can be easily recognized. Omitted.

As shown in FIGS. 12 to 14, in the alignment coil end portion 29 </ b> A, the transition portion 28 </ b> B of the other phase extends from the circumferential one side (C2 side) end portion 28 </ b> Ba to the circumferential intermediate portion 28 </ b> Bc of each phase transition portion 28 </ b> B. In the circumferential direction other side (C1 side) end portion 28Bb to the circumferential intermediate portion 28Bc in the circumferential direction C, the overlapping portion is arranged to face the radial direction R. The interphase insulator 60 covers one end in the circumferential direction of the crossover portion 28B: the end portion on the C2 side and the portion facing the crossover portion 28B of a different phase in the radial direction R, so that the entire crossover portion 28B is not covered. However, insulation in the radial direction R between the phases can be ensured.
Further, since the end portion on the L2 side in the axial direction of the transition portion 28B is covered with the outer insulating portion 60d in the axial direction of the interphase insulator 60, the outer end portion in the axial direction of the transition portion 28B: Interphase insulation with the phase transition portion 28B is ensured. That is, the projecting length of the interphase insulator 60 from the stator core 11 to the outside in the axial direction: L2 only needs to be long enough to cover the end on the outside in the axial direction: L2 side of the transition portion 28B. Therefore, the protrusion length of the interphase insulator 60 from the stator core 11 to the axially outer side: L2 side can be shortened, and accordingly, the length of the stator 2 in the axial direction L can be shortened.

  Furthermore, as shown in FIGS. 12 and 14, the length in the circumferential direction C of the radially outer insulating portion 60a and the radially inner insulating portion 60b of the interphase insulator 60 is the circumferential direction of the transition portion 28B of the V-phase coil 21v. One side: The length from the end on the C2 side to the stepped portion (circumferential intermediate portion 28Bc) is longer than the length. That is, the interphase insulator 60 covers the stepped portion of the transition portion 28B of the V-phase coil 21v. Therefore, even if the transition portion 28B of the V-phase coil 21v is close to the transition portion 28B of the U-phase coil 21u and the transition portion 28B of the W-phase coil 21w around the stepped portion, insulation between the phases is ensured.

  Furthermore, the shape of the interphase insulator 60 is such that the transition portion 28B has a radially outer side: a part on the R2 side, a radially inner side: a part on the R1 side, a circumferential one side: an end part on the C2 side, Outside in the axial direction: a so-called hood shape that covers the end on the L2 side. Then, since the interphase insulator 60 can be mounted by covering the hood-shaped interphase insulator 60 on each crossover portion 28B, the interphase insulation is easy to implement.

  In addition, a part of the crossover portion 28B is routed to the outside in the axial direction: L2 side of the alignment coil end portion 29A as the connection portion 29B with the lead wire, and the alignment coil end portion is being routed while being routed. 29A axial direction outside: There is a possibility of being close to the L2 side. However, since the axially outer insulating portion 60d of the interphase insulator 60 covers a part on the outer side in the axial direction L2 side of the alignment coil end portion 29A (crossover portion 28B), the connection portion 29B and the alignment coil end portion 29A are covered. Interphase insulation can be secured.

[Other Embodiments]
(1) In the above embodiment, the shape of the interphase insulator 60 is illustrated, but the shape may be modified as appropriate. FIG. 15 shows an example in which a hole 60 e is formed in the interphase insulator 60. The hole 60e is formed so that the connecting portion 29B of the crossing portion 28B can pass therethrough. That is, when the connection portion 29B is originally located at a portion where the interphase insulator 60 is to be attached (that is, a portion from the circumferential one side end portion 28Ba to the circumferential intermediate portion 28Bc). And the interphase insulator 60 interfere with each other. Therefore, the interphase insulator 60 having the shape illustrated in FIG. 11 cannot be attached to the transition portion 28B. However, as shown in FIG. 15, the interphase insulator 60 can be attached to the crossover portion 28B by forming the hole 60e through which the connection portion 29B can pass in the interphase insulator 60.

(2) In the above embodiment, the bent part 62 of the interphase insulator 60 constitutes the axially outer insulating part 60d, and the joined side part 61 constitutes the circumferential one side insulating part 60c. Although the example has been described, for example, the bent portion 62 may be modified so as to constitute the circumferential one side insulating portion 60c, and the joined side portion 61 portion may constitute the axially outer insulating portion 60d. .
Further, an interphase insulator having the same shape as described above may be produced by joining two adjacent sides of two substantially rectangular sheet-like insulating materials having the same shape.

(3) In the above embodiment, the linear conductor 31 is configured by a single rectangular wire having a substantially rectangular cross section, and its circumferential width W5 is substantially equal to the circumferential width W3 of the slot interior 14. The case where they are formed to be equal has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the circumferential width W5 of the linear conductor 31 only needs to be larger than the circumferential width W1 of the inner circumferential opening 13 of the slot 12, and the circumferential width of the slot inner 14 from the circumferential width W1 of the inner circumferential opening 13 is sufficient. It can be arbitrarily set up to W3. Further, the cross-sectional shape of the linear conductor 31 is not particularly limited, and various shapes such as a round shape and a polygonal shape can be adopted. Further, if the circumferential width W5 is formed wider than the circumferential width W1 of the inner circumferential opening 13, the linear conductor 31 is as if a plurality of conductors are a single conductor. It is also possible to use a conductor made of an aggregate that is configured by being assembled. For example, it is also possible to use a wire conductor or the like in which a plurality of conductors are gathered and formed integrally.

(4) In the above embodiment, the case where the stator 2 is a stator used in the rotating electrical machine 1 driven by three-phase alternating current has been described as an example. However, the embodiment of the present invention is not limited to this. That is, it is also one preferred embodiment of the present invention that the stator 2 is configured to be used in the rotating electrical machine 1 that is driven by a two-phase or four-phase or more AC power source.

(5) In the above embodiment, the slot 12 is a semi-open slot (the circumferential width W1 of the inner circumferential opening 13 that opens radially inward is narrower than the circumferential width W3 of the slot interior 14). The slot 12 is an open slot (a slot in which the circumferential width W1 of the inner circumferential opening 13 that opens radially inward is equal to or greater than the circumferential width W1 of the slot interior 14). ).

(6) In the above embodiment, three sets of coils 21 having the shapes as shown in FIGS. 4 to 6 are arranged adjacent to each other in the radial direction R in the same slot 12, and six coils per slot. The case where the side portions 22 are arranged in the radial direction R in a line in the slot 12 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the number of coil side portions 22 per slot 12 arranged in a line in the radial direction R can be changed as appropriate. Moreover, the shape of the coil 21 preliminarily formed shown in FIGS. 4 to 6 is merely an example, and various shapes can be adopted.

(7) In the embodiment described above, the armature for a rotating electrical machine according to the present invention is applied to the stator 2 as the stator of the rotating electrical machine 1, and the rotating electrical machine 1 is provided with the stator 2 as the armature. The case where a rotary electric machine of the type is used has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, the armature for a rotating electrical machine according to the present invention is applied to the rotor of the rotating electrical machine 1, and the rotating electrical machine 1 can be an outer rotor type rotating electrical machine having a rotor as an armature. This is one of the preferred embodiments.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for an armature for a rotating electrical machine including an interphase insulator for ensuring interphase insulation between a plurality of phase coils.

1 Rotating electrical machine 2 Stator (armature for rotating electrical machine)
11 Stator core (core)
21 Coil 21u U-phase coil (first phase coil)
21v V phase coil (second phase coil)
21w W phase coil (third phase coil)
22 Coil side part 23 Coil end part 25 Radial direction conductor part 26 Circumferential direction conductor part 28B Crossover part 28Ba Circumferential direction one side edge part (outer side part)
28Bb Circumferential other side end (inner side part)
28Bc Middle part in the circumferential direction (step part)
29A Alignment coil end part 60 Interphase insulator 60a Radial outer insulation part 60b Radial inner insulation part 60c Circumferential one side insulation part 60d Axial outer insulation part 61 Side part 62 Bending part L Axial direction R Radial direction C Circumferential direction

Claims (4)

An armature for a rotating electrical machine including an interphase insulator for securing interphase insulation between coils of a plurality of phases,
The circumferential direction is such that at least one end protruding in the axial direction from the core in the coil wound around the substantially cylindrical core connects between the coil side portions of the same phase arranged at different circumferential positions. Different phases in the case where each phase includes a transition portion extending in the axial direction and protruding in the axial direction, and the transition portions of each phase are aligned coil end portions arranged in a radial direction and a circumferential direction. A part of the crossover portion is overlapped in the circumferential direction and the overlapped portion is attached to the crossover portion of each phase arranged so as to face the radial direction,
A radially outer insulating portion that covers a portion overlapping in a circumferential direction with the transition portion of a different phase on a radially outer surface of the transition portion, and a circumferential direction of the transition portion and a different phase on a radially inner surface of the transition portion. A radially inner insulating portion covering an overlapping portion, a radially outer insulating portion connecting the radially outer insulating portion and the radially inner insulating portion, and covering a circumferential one end portion of the transition portion; and An armature for a rotating electrical machine comprising an interphase insulator having a radially outer insulating portion and an axially outer insulating portion that connects the radially inner insulating portion and covers an axially outer end portion of the bridging portion. In the alignment coil end portion, the interphase insulator extends from the circumferential one side end of the crossing portion of each phase to the circumferential intermediate portion from the circumferential other side end of the crossing portion of the other phase. The crossover portion is arranged so as to overlap in the circumferential direction with the middle portion in the direction, and the overlapping portion is opposed in the radial direction,
2. The rotating electrical machine according to claim 1, wherein the radially outer insulating portion and the radially inner insulating portion are configured to cover from the circumferential one side end portion to the circumferential intermediate portion of the transition portion. Armature.   3. The armature for a rotating electrical machine according to claim 1, wherein the interphase insulator is formed by folding a substantially rectangular sheet-like insulating material in two and joining a side portion adjacent to one end side of the bent portion. Comprising a three-phase coil composed of a first phase, a second phase and a third phase;
The plurality of transition portions of the first phase and the plurality of transition portions of the third phase are arranged at different positions in the radial direction and are circumferentially overlapped by approximately half the length in the circumferential direction. Are arranged
The transition portion of the second phase has a radial step portion in a circumferential intermediate portion,
The one side portion in the circumferential direction with respect to the step portion of the transition portion of the second phase is disposed at the same position in the radial direction as one of the transition portions of the first phase and the third phase and the first phase. Arranged to overlap the other of the one phase and the other of the third phase in the circumferential direction,
The other side portion in the circumferential direction with respect to the step portion of the transition portion of the second phase is disposed at the same position in the radial direction as the other transition portion of the first phase and the third phase, and It is arranged so as to overlap with one of the one phase and the third phase in the circumferential direction,
In the interphase insulator, the circumferential length of the radially outer insulating portion and the radially inner insulating portion is a length from the circumferential one side end of the transition portion of the second phase to the stepped portion. The armature for a rotating electrical machine according to any one of claims 1 to 3, which is as described above.

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