JP2010239739A - Interphase insulation sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interphase insulation sheet capable of unfailingly executing interphase insulation among a plurality of phase coils and being easily stably attached to a bent coil end portion. <P>SOLUTION: The interphase insulation sheet 50A is made of a circular sheet member in which a plurality of slots 12 each extending in an axial direction is formed so that at least one end protruding in the axial direction from a core 11 in a coil 21 wound around a substantially cylindrical core 11 distributedly arranged in the circumferential direction is bent and formed in the inside of a diameter direction, and coil end portions 23 of different phases are formed as a bent coil end portion 24 consisting of a combination of a plurality of phases of coils 21 aligned and arranged as a set in the axial direction and the circumferential direction, and are sandwiched between the two bent coil end portions 24 of an armature for a rotating electric machine 2 aligned and disposed in the axial direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an interphase insulating sheet for securing interphase insulation between a plurality of coils provided in an armature for a rotating electrical machine.

  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 a general armature for a rotating electrical machine, a plurality of slots extending in the axial direction are distributed in the circumferential direction, and each slot has an inner circumferential opening that opens radially inward. Some have a cylindrical core and a plurality of coils 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 pulled out at both ends in the axial direction of the core. It is bundled as a transition part. At both ends in the axial direction of the core, there are transition portions of the coils of a plurality of phases, and a coil end portion is formed by the transition portions of the coils of each phase arranged over the entire circumference of the core. And the interphase insulation sheet for ensuring the interphase insulation between the transition parts of a different phase is provided.

  The interphase insulating sheet described in Patent Document 1 has a three-dimensional member that covers a part of a bundled crossing portion. A plurality of the three-dimensional members are bonded to a belt-like member extending over the entire circumference of the coil end portion. That is, in patent document 1, since the crossing part in which the several thin conducting wire wound by the slot was bundled is made into the object of interphase insulation, the shape of an interphase insulating sheet also corresponds to the shape of a crossing part. It becomes. For example, the interphase insulating sheet described in Patent Document 1 has a complicated shape that covers the transition portion from any of the axial direction, the radial direction, and the circumferential direction.

JP 2007-74773 A

  Rather than winding a thin conductive wire around a core as in the past, a coil is formed in advance using a rectangular conductive wire, and an armature for a rotating electrical machine is manufactured by assembling the pre-formed coil to a core. Proposed. When the coil is preformed, the coil end portion at the end opposite to the lead wire is drawn is bent inward in the radial direction. By inserting the preformed coil in the axial direction with respect to the core with the bent coil end portion formed in a bent manner, interference between the core and the coil end portion (bending coil end portion) can be avoided.

  In this type of armature for a rotating electrical machine, the coils of each phase in the bent coil end portion are regularly aligned and preformed, which is completely different from the shape of a conventional transition portion. Therefore, the shape of the interphase insulating sheet is inevitably different, and the conventional interphase insulating sheet as described in Patent Document 1 cannot be diverted. For example, when the coils of each phase are regularly laminated along the axial direction at the bent coil end, the interphase insulation of each phase is inserted by inserting an interphase insulating sheet in a plane orthogonal to the axial direction. It is necessary to ensure. In other words, the shape of the interphase insulating sheet is not a form in which the connecting portion formed of a bundle of conducting wires is covered from any of the axial direction, the radial direction, and the circumferential direction as in the prior art, and the rectangular conducting wires are aligned. The bending coil end portion (crossover portion) arranged in this manner is attached from one direction. Therefore, there is a problem that it is difficult to determine the mounting position of the interphase insulating sheet, and even if the position is determined and assembled, it may not be fixed with the varnish until the insertion of the coil into the core is completed, and a positional shift may occur.

  The present invention has been made in view of the above problems, and its purpose is to ensure interphase insulation between coils of a plurality of phases and to facilitate stable mounting on a bent coil end portion. The point is to provide a sheet.

In order to achieve this object, the characteristic configuration of the interphase insulating sheet for securing interphase insulation between the coils of the plurality of phases included in the armature for a rotating electrical machine according to the present invention is that the plurality of slots extending in the axial direction are circumferential. In the coil wound around the substantially cylindrical core dispersedly arranged, at least one end portion protruding in the axial direction from the core is bent inward in the radial direction, and coil end portions of different phases Is a bending coil end portion in which a plurality of coils arranged in an axial direction and a circumferential direction are arranged as a set, and the plurality of sets of bending coil end portions are arranged side by side in the axial direction. The armature is composed of an annular sheet member sandwiched between the two bent coil end portions.
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 interphase insulating sheet is constituted by the annular sheet member sandwiched between the two bent coil end portions, the insulation between the two bent coil end portions, that is, between the different phase coils. Interphase insulation is ensured.
Further, since the interphase insulating sheet is sandwiched between the two bent coil end portions, it is possible to prevent the positional shift of the interphase insulating sheet.
Therefore, it is possible to provide an interphase insulating sheet that can reliably perform interphase insulation between coils of a plurality of phases and can easily be stably attached to the bent coil end portion.

  Further, the coil end portions of the respective phases constituting the bent coil end portion include a radial conductor portion that is bent from a coil side portion disposed in each slot and extends in the radial direction, and a pair of the radial conductors A circumferential conductor portion extending in the circumferential direction so as to connect the portions, and a plurality of sets of the bending coil ends are provided with extending protrusions extending in the axial direction at a specific portion in the radial direction of the radial conductor portion. Preferably, the annular sheet member is formed to be sandwiched by a set of the extension protrusions adjacent in the axial direction. It is.

  According to this configuration, the interphase insulating sheet is sandwiched from the axial direction by the extending projections extending in the axial direction at specific portions of the radial conductor portion. That is, since the interphase insulating sheet is more securely sandwiched between the two bent coil end portions, it is possible to prevent the positional shift of the interphase insulating sheet.

  In addition, the slot is formed such that the circumferential width of the inner circumferential opening that opens radially inward is narrower than the circumferential width of the slot located radially outward from the inner circumferential opening. The specific part where the extension protrusion is formed is a part corresponding to the inner peripheral opening in the axial direction, and the circumferential width of the extension protrusion is larger than the peripheral width of the inner peripheral opening. It is preferable that the configuration is formed so as to be recessed with respect to other portions of the radial conductor portion so as to be narrow.

The slot provided in the stator core is a semi-open slot (semi-open slot type in which the circumferential width of the opening opening radially inward is narrower than the circumferential width of the portion where the coil is mounted). Let us consider a case where a rotating electrical machine is configured using a core and a coil composed of a rectangular conductor. At this time, since the circumferential width itself of the rectangular wire is wider than the circumferential width of the opening of the slot, the bending coil end cannot be inserted into the slot from the radially inner side.
However, according to this characteristic configuration, the circumferential width of the specific portion where the extending protrusion is formed is narrower than the circumferential width of the inner circumferential opening of the slot. On the other hand, it is formed in a recessed shape. Therefore, by passing the specific part formed narrowly through the inner peripheral opening of the slot, the coil can be inserted into the slot of the core in the axial direction from the side of the bent coil end. Become. The interphase insulating sheet having this characteristic configuration is suitable for interphase insulation of such a bent coil end portion.

  The annular sheet member includes an annular portion having a diameter of an outer peripheral edge smaller than a diameter of the inner peripheral surface of the core, and the extension protrusion partially protruding radially outward from the annular portion. It is preferable to have a configuration having at least one protrusion sandwiched between sets of portions.

  According to this configuration, at least the annular portion can pass without interfering with the inner peripheral surface of the core. Therefore, when the coil of each phase is inserted and wound in the axial direction with respect to the slot with the bent coil end portion at the head, the interphase insulating sheet is inserted between the coil phases in the core internal space. It can pass.

  Moreover, it is preferable that the circumferential length of the protruding portion is a length extending between a plurality of slots arranged in the circumferential direction.

  According to this configuration, the protrusion is sandwiched by the set of the plurality of extension protrusions. Therefore, the interphase insulating sheet is securely sandwiched between the two bent coil end portions.

  In addition, it is preferable that the circumferential length of the protruding portion is substantially the same as the circumferential width of the inner circumferential opening that opens on the radially inner side of the slot.

  According to this configuration, the protrusion is securely held by the set of extension protrusions while preventing interference between the protrusion and the slot.

  Further, the armature for a rotating electrical machine is wound in the form of distributed winding on the core configured with an inner peripheral opening in which each slot opens radially inward, and the plurality of slots. A three-phase coil composed of a first phase, a second phase, and a third phase, and the coil end portion of the second phase has a step portion in the axial direction at an intermediate portion in the circumferential direction. An inner side portion located on one end side in the circumferential direction and on the inner side in the axial direction from the stepped portion and an outer side portion located on the other side in the circumferential direction and on the outer side in the axial direction from the stepped portion. The coil end part of the first phase is adjacent to the inner side part of the coil end part of the second phase in the axially outer side, and the coil of the second phase It is arranged adjacent to the outer side portion of the end portion in the circumferential direction, and the third phase The second end is adjacent to the outer side portion of the second phase coil end portion in the axially inner side, and is circumferential with respect to the inner side portion of the second phase coil end portion. The annular sheet member is disposed adjacent to the direction, and the annular sheet member is axially outer of the first phase coil end portion and the outer portion of the second phase coil end portion. The axially outward surface of one of the bent coil end portions configured on the side, the axially inner side of the third phase coil end portion, and the inner side of the second phase coil end portion It is preferable to adopt a structure that is sandwiched between the axially inward side surfaces of the other bending coil end portions that are configured on the axially inner side of the side portion.

  According to this configuration, the axially outward side of the first phase coil end portion and the axially outward side of the outer side portion of the second phase coil end portion and the axial direction of the third phase coil end portion It is possible to reliably insulate the inner side and the axially inner side of the inner side portion of the coil end portion of the second phase with the interphase insulating sheet.

  The annular sheet member is preferably formed of a single member.

  According to this configuration, the number of parts can be minimized by forming the interphase insulating sheet with one member.

  The annular sheet member is preferably formed by connecting a plurality of arc-shaped belt members having the same shape or different shapes in the circumferential direction.

  According to this configuration, by forming the interphase insulating sheet with a plurality of members, even if a defect such as a defective shape occurs in some members, only the defective member becomes an unusable member, and the other members are It can be used in combination with another member. Therefore, the yield as the whole interphase insulating sheet can be improved.

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 the top view which looked at the stator obtained by winding a three-phase coil around a stator core from the bending coil end part side. It is a figure which shows typically the VIII-VIII cross section (circumferential direction cross section of a stator) of FIG. FIG. 8 is a cross-sectional view taken along line IX-IX in FIG. 7 (cross section in the radial direction of the stator). It is a perspective view explaining the process of inserting the coil of each phase into a stator core. It is a perspective view of a phase insulation sheet. It is a perspective view of a phase insulation sheet. FIG. 3 is a circumferential sectional view of a stator schematically showing a state in which an interphase insulating sheet is provided between coils of each phase. It is radial direction sectional drawing of the stator which shows the state by which the interphase insulating sheet was provided between the coils of each phase. (A) is a perspective view explaining the arrangement | positioning state of the phase insulation sheet between the coils of each phase, (b) is a top view explaining an arrangement | positioning state. It is a perspective view explaining the arrangement | positioning state of the phase insulation sheet between the coils of each phase. It is a perspective view explaining the arrangement | positioning state of the phase insulation sheet between the coils of each phase. It is a perspective view explaining the arrangement | positioning state of the phase insulation sheet between the coils of each phase. (A) is a perspective view of the phase insulation sheet of another embodiment between the coils of each phase, (b) is a top view explaining an arrangement state. It is a perspective view of the phase insulation sheet of another embodiment.

An embodiment of an interphase insulating sheet according to the present invention will be described with reference to the drawings. In the present embodiment, a case where the interphase insulating sheet according to the present invention is used in an armature of a rotating electrical machine (hereinafter referred to as “stator”) will be described as an example. First, the configuration of the rotating electrical machine in the form in which the interphase insulating sheet is not provided will be described, and then the configuration of the rotating electrical machine in the form in which the interphase insulating sheet is provided 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 a stator obtained by winding a three-phase coil around a stator core as seen from the bent coil end portion side. FIG. 8 is a diagram schematically showing a VIII-VIII cross section (a circumferential cross section of the stator) of FIG. 7, and FIG. 9 is a cross section of IX-IX of FIG. 7 (a radial cross section of the stator). As described above, since the purpose is to explain the configuration of the coil 21, the interphase insulating sheet is not shown.

First, the shape of each phase of the coil 21 will be described with reference to FIGS. Thereafter, the structure of the bending coil end portion will be described with reference to FIGS.
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 coil 21 of each phase is a coil end that connects a coil side portion 22 arranged in the slot 12 and a pair of coil side portions 22 arranged in different slots 12 at both ends in the axial direction L of the stator core 11. Part 23. 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 is formed so as to extend along the circumferential direction C by connecting a pair of coil side portions 22 arranged in different slots 12. As shown in FIG. 2, each coil end portion 23 is disposed so as to protrude from both end portions in the axial direction L of the stator core 11 in the axial directions L1 and L2 of the stator core 11. As shown in FIGS. 4 to 6, the coil 21 extends in the axial direction L and is sequentially arranged in the plurality of slots 12. The coil side portions 22 are arranged on one axial end side: L2 side coil end portion. 23 and the other axial end side: the coil end portions 23 (bending coil end portions 24) on the L1 side are alternately connected to form a waveform that circulates in the circumferential direction C of the stator core 11. 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. .

  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 Bending Coil End Part Next, the configuration of the bending coil end part will be described with reference to FIGS.
Among the coils 21 of each phase, at least the other axial end side protruding from the stator core 11 in the axial direction L: the coil end portion 23 on the L1 side is bent and formed radially inward: R1 side, and different phases These coil end portions are bent coil end portions 24 arranged in the axial direction and the circumferential direction. As shown in FIG. 9, 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 is bent from the coil side portion 22 disposed in each slot 12 as shown in FIGS. A radial conductor portion 25 extending in the radial direction R, and a radial conductor extending in the circumferential direction C so as to connect between the pair of radial conductor portions 25 on the R1 side relative to the inner circumferential opening 13. Part 26.

  The linear conductor 31 constituting the radial conductor portion 25 is formed to extend from the coil side portion 22 in the axial direction L of the stator core 11 and then bend to the radially inward side: R1 side. As described above, since the six linear conductors 31 constituting the coil side portion 22 are arranged in a line in the radial direction R in the slot 12, the radial conductor portion 25 has six wires. The conductors 31 are aligned and arranged so as to be bent from the state substantially parallel to the axial direction L to the radially inward side: R1 side and to be substantially parallel to the radial direction R while maintaining the state of being aligned in a line. ing. Thereby, the radial direction conductor part 25 becomes the structure arrange | positioned in order in the axial direction L. Further, the radial conductor portion 25 extends inward in the radial direction R from at least the inner peripheral surface of the stator core 11. In the present embodiment, the portion of the linear conductor 31 constituting the bent coil end portion 24 that has the same position in the circumferential direction C as the coil side portion 22 is used as the radial conductor portion 25.

  The linear conductor 31 constituting the circumferential conductor portion 26 extends while bending in the circumferential direction C from the radial conductor portion 25 corresponding to one slot 12 toward the radial conductor portion 25 corresponding to the other slot 12. After being drawn out, it is formed so as to be bent radially outward: R2 side and connected to the radial conductor portion 25 corresponding to the other slot 12. As described above, since the radial conductor portion 25 extends at least inward in the radial direction R from the inner peripheral surface of the stator core 11, the circumferential conductor portion 26 is inward in the radial direction R from the inner peripheral surface of the stator core 11. Placed in.

  As shown in FIG. 8, the bending coil end portion 24 is configured with the U-phase, V-phase, and W-phase coil end portions 23 as one set, and a plurality of sets (three sets in this embodiment) of the bending coil end portions 24. Are arranged side by side in the axial direction L. Specifically, a set of bent coil end portions 24 is configured by the U-phase, V-phase, and W-phase coil end portions 23 of the first and second layers from the top in FIG. In addition, another set of bent coil end portions 24 is constituted by the U-phase, V-phase, and W-phase coil end portions 23 of the third and fourth layers. Furthermore, another set of bent coil end portions 24 is constituted by the fifth-layer and sixth-layer U-phase, V-phase, and W-phase coil end portions 23.

As shown in FIG. 9, of the six linear conductors 31 arranged in a line in the radial direction R in the slot 12, the two linear conductors arranged on the radially outer side: R2 side. The conductors 31 are arranged in two rows in the radial direction R as the circumferential conductor portion 26 of the bending coil end portion 24. Further, when attention is paid to two slots 12 of the same phase adjacent in the circumferential direction, a total of four linear conductors 31 including two linear conductors 31 arranged on the radially outer side: R2 side in each of them are combined. The conductors 31 are arranged in four rows in the radial direction R as the circumferential conductor portions 26. This radial outer side: a total of four linear conductors 31 arranged on the R2 side is composed of the U-phase, V-phase and W-phase of the first and second layers from the top in FIG. This is a set of bent coil end portions 24 constituted by the coil end portions 23.
Of the six linear conductors 31 arranged in a line in the radial direction R in the slot 12, the two linear conductors 31 arranged on the radial inner side: R1 side are bent. The circumferential conductor portions 26 of the coil end portion 24 are arranged in two rows in the radial direction R. Further, when attention is paid to two slots 12 of the same phase adjacent in the circumferential direction, a total of four linear conductors 31 including two linear conductors 31 arranged on the radially inner side: R1 side in each of them are combined. The conductors 31 are arranged in four rows in the radial direction R as the circumferential conductor portions 26. This radial inner side: a total of four linear conductors 31 arranged on the R1 side are the U-phase, V-phase and W-phase of the fifth and sixth layers from the top in FIG. This is a set of bent coil end portions 24 constituted by the coil end portions 23.
Further, among the six linear conductors 31 arranged in a line in the radial direction R in the slot 12, the remaining two linear conductors 31 are used as the circumferential conductor portions 26 of the bending coil end portion 24. They are arranged in two rows in the radial direction R. When attention is paid to the two slots 12 of the same phase adjacent in the circumferential direction, a total of four linear conductors 31 including the remaining two linear conductors 31 in each of the slots 12 have a diameter as the circumferential conductor portion 26. They are arranged in four rows in the direction R. A total of four linear conductors 31 are composed of a set of bends composed of the U-phase, V-phase, and W-phase coil end portions 23 of the third and fourth layers from the top in FIG. This is a coil end portion 24.

2.2 (1) Bending coil end portion of V-phase coil As shown in FIGS. 5 and 8, when focusing on one set of bending coil end portions 24, the bending coil end portion 24 of the V-phase coil 21v is linear. An outer side portion 26a in which the conductor 31 is aligned adjacently in the circumferential direction and the radial direction on the axially outward side: L1 side, and a linear conductor 31 is the circumferential direction and diameter on the axially inward side: L2 side. It has an inner side portion 26b aligned adjacent to each other and a step portion 26c between the outer side portion 26a and the inner side portion 26b.
Specifically, the circumferential conductor portion 26 in the V-phase bent coil end portion 24 has a step portion 26 c that is bent in the axial direction L at an intermediate portion in the circumferential direction C. Further, the circumferential conductor portion 26 has an inner side portion 26b positioned on the one side in the circumferential direction C1 side and on the inner side in the axial direction L2 side with respect to the step portion 26c, and the other in the circumferential direction with respect to the step portion 26c. Side: C2 side and axially outward side: an outer side portion 26a located on the L1 side. That is, as shown in FIGS. 5 and 8, in the outer side portion 26a of the circumferential conductor portion 26 in the V-phase bent coil end portion 24, the four linear conductors 31 are axially outward: L1. In the inner side portion 26b, the four linear conductors 31 are aligned on the axially inner side: L2 side.

  More specifically, when the two linear conductors 31 of the V-phase coil 21v located on the radially outer side of the slot 12 on the R2 side are bent at the bent portion 34, they are positioned on the outer side of the axis L1 side. The other two linear conductors 31 of the V-phase coil 21v on the radially inner side of the slot 12 on the R1 side are positioned on the axially inner side: L2 side when bent at the bent portion 34. And in the outer side part 26a of the circumferential direction conductor part 26, the two linear conductors 31 located in the axial direction inner side: L2 side are two linear conductors of the axial direction outer side: L1 side. The outer circumferential side axial stepped portion 27 is formed so as to be aligned adjacent to the circumferential direction C and the radial direction R with respect to 31 and bent in the axially outward direction: L1 side. Further, in the inner side portion 26b of the circumferential conductor portion 26, the two linear conductors 31 positioned on the outer side in the axial direction: L1 side are the two linear conductors on the inner side in the axial direction: L2 side. The outer circumferential side axial stepped portion 27 is formed so as to be aligned adjacent to the circumferential direction C and the radial direction R with respect to 31 and bent inward in the axial direction: L2.

2.2 (2) Bend coil end portion of U-phase coil As shown in FIGS. 4 and 8, in the circumferential conductor portion 26 in the U-phase bent coil end portion 24, four linear conductors 31 are arranged in the axial direction. Outer side: Align on the L1 side. Specifically, the U-phase bending coil end portion 24 is adjacent to the inner side portion 26b of the V-phase bending coil end portion 24 in the axially outward side: L1 side, and is bent in the V-phase. The coil end portion 24 is disposed adjacent to the outer side portion 26 a in the circumferential direction C.
Specifically, when the two linear conductors 31 of the U-phase coil 21u located on the radially outer side of the slot 12 on the R2 side are bent at the bent portion 34, they are positioned on the outer side of the axis L1 side. The other two linear conductors 31 of the U-phase coil 21u located on the radially inner side of the slot 12: R1 are positioned on the axially inner side: L2 side when bent at the bent portion 34. . In the bending coil end portion 24, the two linear conductors 31 positioned on the inner side in the axial direction: L2 side are circumferential with respect to the two linear conductors 31 on the outer side in the axial direction: L1 side. The outer peripheral side axial stepped portion 27 is formed so as to be aligned adjacent to C and the radial direction R while being bent toward the axially outward side: L1 side.

2.2 (3) Bend coil end portion of W-phase coil As shown in FIGS. 6 and 8, in the circumferential conductor portion 26 in the W-phase coil end portion 23, four linear conductors 31 are arranged in the axial direction. Side: Align on the L2 side. Specifically, the W-phase bending coil end portion 24 is adjacent to the outer side portion 26a of the V-phase bending coil end portion 24 in the axially inward side: L2 side and is bent in the V-phase. The coil end portion 24 is disposed adjacent to the inner side portion 26b in the circumferential direction.
Specifically, when the two linear conductors 31 of the W-phase coil 21w located on the radially outer side of the slot 12 on the R2 side are bent at the bent portion 34, they are positioned on the outer side of the axis L1 side. The other two linear conductors 31 of the W-phase coil 21w located on the radial inner side: R1 side of the slot 12 are positioned on the axial inner side: L2 side when bent at the bent portion 34. . In the bending coil end portion 24, the two linear conductors 31 positioned on the axially outer side: L1 side are circumferential with respect to the two linear conductors 31 on the axially inner side: L2 side. The outer peripheral side axial stepped portion 27 is formed so as to be aligned adjacent to C and the radial direction R while being bent toward the axially outward side: L1 side.

2.3 Configuration of Radial Conductor Portion Next, the configuration of the radial conductor portion 25 of the bent coil end portion 24 in each coil 21 will be described. As shown in FIG. 3B and FIG. 4, the radial conductor portion 25 includes a narrow recess 32 whose circumferential width W7 is narrower than the circumferential width W1 of the inner circumferential opening 13 of the slot 12. . The narrow recess 32 is provided at a specific portion in the radial direction R corresponding to the inner peripheral opening 13 of the slot 12 in the radial conductor portion 25. Note that the circumferential width of the portion other than the narrow recess 32 in the radial conductor portion 25 is equal to the circumferential width W5 of the linear conductor 31 constituting the coil 21, and therefore the circumferential direction of the inner circumferential opening 13 of the slot 12. It is formed wider than the width W1. That is, in the radial conductor portion 25, a narrow recess having a shape recessed with respect to a portion other than the position of the radial conductor portion 25 at a specific portion in the radial direction R corresponding to the inner peripheral opening portion 13 of the slot 12. 32 is formed.

  When viewed from the axial direction L, the narrow recess 32 has an outer shape corresponding to the outer shape of the protruding portion 16 provided at the radial inner side of the teeth 15 of the stator core 11: the end portion on the R1 side. Is formed. That is, in the radial conductor portion 25, a narrow recess 32 is formed by recessing only the vicinity of a specific portion corresponding to the inner peripheral opening 13 of the slot 12. At this time, the circumferential width W 7 of the narrow recess 32 is formed to be narrower than the circumferential width W 1 of the inner circumferential opening 13 of the slot 12. In this way, only in a specific portion corresponding to the inner peripheral opening 13 of the slot 12 in the radial conductor portion 25, the narrow recess 32 whose circumferential width W7 is narrower than the circumferential width W7 of the inner peripheral opening 13 is provided. Is formed. In addition, since only the predetermined position of the radial direction conductor part 25 is made into the narrow recessed part 32, the process site | part of the coil 21 becomes only the specific site | part corresponding to the inner peripheral opening part 13, and a process becomes easy.

  As described above, since the radial conductor portion 25 includes the narrow concave portion 32 having a shape corresponding to the outer shape of the protruding portion 16 at a specific portion corresponding to the inner peripheral opening portion 13 of the slot 12, the teeth of the stator core 11. 15 inward in the radial direction: the protrusion 16 provided at the end on the R1 side and the linear conductor 31 constituting the coil 21 are configured so as not to overlap when viewed from the axial direction L. Therefore, as in the present embodiment, a semi-open slot type stator core 11 and a coil 21 constituted by a linear conductor 31 having a circumferential width W5 substantially equal to the circumferential width W3 of the slot inside 14 of the stator core 11 are used. Even when the stator 2 is configured, the coil 21 is connected to the slot 12 by passing the narrow recess 32 through the inner peripheral opening 13 of the slot 12 included in the stator core 11. It can be inserted in the axial direction L from the side.

  Here, in the present embodiment, the narrow concave portion 32 is formed by compressing a portion extending in the radial direction R of the radial conductor portion 25 in the circumferential direction C and extending in the axial direction L. It is said that. As shown in FIGS. 7 and 9, the radial conductor portion 25 is compressed in the circumferential direction C and extended in the axial direction L by the extension protrusion 33. The extension protrusions 33 are arranged in the axial direction L. In the present embodiment, the extension protrusion 33 has a cross-sectional area perpendicular to the energization direction of the coil 21 in the extension protrusion 33 at a portion other than the extension protrusion 33 over the entire radial direction R. It is extended in the axial direction L while being compressed in the circumferential direction C so as to be substantially equal to the cross-sectional area of the cross section. Thereby, since the cross-sectional area of the cross section orthogonal to the energization direction is kept substantially constant over the entire coil 21, the electrical resistance value in the extension projection 33 is substantially equal to the electrical resistance value in the portion other than the extension projection 33. Can be equal. Therefore, it is possible to suppress the occurrence of inconveniences such as locally increasing heat generation at the extension protrusion 33.

  Further, as shown in FIG. 9, the extension protrusion 33 is formed by extending in the axial direction L, and portions of the extension protrusion 33 extending in the axial direction L are arranged side by side in the axial direction L. The portions of the extension protrusion 33 that have extended in the axial direction L are in contact with each other in the axial direction L, and are in contact with each other. As a result, as can be understood with reference to FIG. 4 to FIG. 6 and FIG. 9, the portions other than the extension projections 33 of the bending coil end 24 are adjacent to the axial direction L even without providing a spacer or the like. The axial distance D between the linear conductors 31 increases. Thereby, for example, when a refrigerant is caused to flow between the linear conductors 31 in order to cool the bending coil end portion 24, the refrigerant easily flows between the linear conductors 31 and heat exchange efficiency is increased. improves.

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 bent in a state where the extending protrusion 33 as the narrow recess 32 in the radial conductor portion 25 and the inner peripheral opening 13 of the slot 12 of the stator core 11 correspond to each other. Inserted in the axial direction L into the slot 12 from the 24 side.
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 Insulating Sheet FIGS. 11 and 12 are perspective views of the interphase insulating sheet. Specifically, FIG. 11 is a perspective view of the interphase insulating sheet 40, and FIG. 12 is a perspective view of the interphase insulating sheet 50A. FIG. 13 is a circumferential sectional view of a stator schematically showing a state in which an interphase insulating sheet is provided between coils of each phase, and FIG. 14 is a state in which an interphase insulating sheet is provided between the coils of each phase. It is radial direction sectional drawing of the stator which shows.

  The interphase insulating sheet 40 shown in FIG. 11 is used when the U-phase and W-phase coil end portions 23 of the bent coil end portions 24 are the target phase coil end portions that are subject to interphase insulation. That is, the interphase insulating sheet 40 is attached to the U-phase and W-phase coil end portions 23 (bending coil end portions 24) as the target phase coil end portions inside the pair of bending coil end portions 24. As the material of the interphase insulating sheet 40, 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 interphase insulating sheet 40 is formed by bending an annular sheet member S1 at a plurality of locations, and includes a plurality of insulating portions 41 arranged at predetermined intervals along the circumferential direction and two insulating portions 41 adjacent in the circumferential direction. And a connecting portion 42 for connecting the two. The annular sheet member S1 can be manufactured using a resin sheet or a paper material. The insulating portion 41 includes a planar insulating portion 41a disposed so as to face the U-phase and W-phase coil end portions 23 as target phase coil end portions from the axial direction L, and both circumferential edges of the planar insulating portion 41a. And a side surface insulating portion 41b formed by bending in the axial direction L.

As shown in FIG. 13, when the interphase insulating sheet 40 is attached to the U-phase coil end portion 23 as the target phase coil end portion, the U-phase coil end portions arranged at predetermined intervals along the circumferential direction; Interphase insulation between the V-phase and W-phase coil end portions 23 adjacent in the axial direction to the U-phase coil end portion can be ensured.
Specifically, the planar insulating portion 41 a covers a portion of the U-phase coil end portion 23 that faces the V-phase coil end portion 23 and the W-phase coil end portion 23 in the axial direction L.
The side surface insulating portion 41 b may have a shape that covers at least a part of the U-phase coil end portion 23 that faces the coil end portion 23 of the V-phase coil end portion 23 in the circumferential direction. That is, the side-surface insulating portion 41b covers at least part of the U-phase coil end portion 23 that faces the V-phase coil end portion 23 in the circumferential direction C, so that the U-phase coil end portion 23 is side-insulated. It is sandwiched from the circumferential direction C by the portion 41b. Accordingly, the relative movement in the circumferential direction C of the insulating portion 41 (that is, the planar insulating portion 41a and the side insulating portion 41b) with respect to the U-phase coil end portion 23 is prevented. However, in the present embodiment, the side insulating portion 41b has a size that can cover the entire side portion in the circumferential direction C of the U-phase coil end portion (target coil end portion). Thereby, the interphase insulation at the side portion in the circumferential direction C of the U-phase coil end portion 23 can be reliably performed.

  As described above, when the U-phase coil end portion 23 is used as the target phase coil end portion, the planar insulating portion 41a covers the inner side in the axial direction: L2 side of the U-phase coil end portion 23, and is insulated from the side surface. The portion 41b covers at least a part of the side portion in the circumferential direction C of the U-phase coil end portion 23, and the connecting portion 42 is the axially outward side of the outer side portion 26a of the V-phase coil end portion 23: L1 It is arranged to pass through the side. As a result, insulation between the U-phase coil end portion 23 and the coil end portions 23 of different phases (V-phase and W-phase) adjacent in the axial direction L is ensured.

  The same applies to the case where the W-phase coil end portion 23 is the target phase coil end portion. The planar insulating portion 41a covers the axially outward side of the W-phase coil end portion 23: the L1 side, and the side-surface insulating portion 41b It covers at least a part of the side portion in the circumferential direction C of the W-phase coil end portion 23, and the connecting portion 42 passes through the L2 side in the axial direction inward side portion 26 b of the V-phase coil end portion 23. Are arranged as follows. As a result, the insulation between the W-phase coil end portion 23 and the coil end portions 23 of different phases (U-phase and V-phase) adjacent to it in the axial direction L is ensured.

  The interphase insulating sheet 50 </ b> A shown in FIG. 12 is formed by an annular sheet member S <b> 2 and is provided between each set of the bending coil end portions 24. As described above, the extension protrusion 33 extending in the axial direction L is provided at a specific portion in the radial direction R of the radial conductor portion 25, and the plurality of coil end portions 23 constituting the plurality of sets of bending coil end portions 24. Are aligned in the axial direction L. The annular sheet member S2 constituting the interphase insulating sheet 50A includes an annular portion 51 in which the diameter of the outer peripheral edge is smaller than the diameter of the inner peripheral surface of the stator core 11, and a portion radially outside the annular portion 51. One side: It has at least one protrusion 52 that protrudes toward the R2 side and is sandwiched by the set of extension protrusions 33. The interphase insulating sheet 50 </ b> A is sandwiched between sets of extension protrusions 33 adjacent in the axial direction L. As the material of the interphase insulating sheet 50A, 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. In the present embodiment, an example in which the interphase insulating sheet 50 </ b> A has a plurality of protrusions 52 is sufficient, but it is sufficient that there is at least one protrusion 52.

  In each of the annular portions 51 of the interphase insulating sheet 40 and the interphase insulating sheet 50A, the diameter of the outer peripheral edge is smaller than the diameter of the inner peripheral surface of the stator core 11. Therefore, when the coil 21 of each phase is inserted and wound in the axial direction L with respect to the slot 12 with the bent coil end portion 24 as the head, the interphase insulating sheets 40 and 50A are inserted between the coil phases. In this state, it can pass through the internal space of the stator core 11.

  15-18 is a figure explaining the arrangement | positioning state of the phase insulation sheet between the coils of each phase. 15 to 18 are drawn so that it is easy to understand the positional relationship between the coil 21 of each phase and the interphase insulating sheets 40 and 50A. The arrangement form is different from the actual one.

FIG. 15A is a perspective view showing a state in which the interphase insulating sheet 50A is disposed on the axially outward side L1 side of the pair of bending coil end portions 24, and FIG. 15B is a plan view thereof. It is. As shown in FIG. 15, the annular portion 51 of the interphase insulating sheet 50 </ b> A has an outer peripheral diameter smaller than the inner peripheral surface of the stator core 11. The circumferential length of the protrusion 52 of the interphase insulating sheet 50 </ b> A is a length extending between the plurality of slots 12 arranged in the circumferential direction. Further, the projecting portion 52 of the interphase insulating sheet 50 </ b> A is located at a position sandwiched from the axial direction L by the set of the extending projections 33. Therefore, when the coil 21 is inserted in the axial direction L from the bent coil end portion 24 side, the protruding portion 52 of the interphase insulating sheet 50 </ b> A interferes with the teeth 15. However, since the interphase insulating sheet 50A is formed of a highly flexible material such as a resin sheet or paper, it is easily deformed when the coil 21 is inserted in the axial direction L from the bent coil end portion 24 side. Therefore, there is a low possibility that problems such as breakage will occur in the interphase insulating sheet 50A.
FIG. 16 shows a state in which the W-phase coil 21w is disposed on the axially outward side: L1 side of the interphase insulating sheet 50A. As illustrated, the protrusion 52 of the interphase insulating sheet 50 </ b> A is sandwiched from the axial direction L by the extension protrusion 33. As a result, the positional displacement of the interphase insulating sheet 50A does not occur.

FIG. 17 shows a state in which the interphase insulating sheet 40 is arranged with the coil end portion 23 of the W-phase coil 21w as the target phase coil end portion. As shown in FIG. 17, since the W-phase coil end portion 23 as the target phase coil end portion is sandwiched from the circumferential direction by the side surface insulating portion 41b, the insulating portion 41 with respect to the W-phase coil end portion 23 extends in the circumferential direction. Relative movement is prevented. Although the W-phase coil end portion 23 is not sandwiched in the radial direction by the insulating portion 41, the plurality of insulating portions 41 are connected by the connecting portion 42, so that the plurality of insulating portions 41 move together in the same direction. It is only allowed to do. Accordingly, each insulating portion 41 cannot move in the radial direction, and relative movement in the radial direction of the interphase insulating sheet 40 with respect to the W-phase coil end portion 23 is also prevented.
Furthermore, since the shape of the insulating portion 41 is previously formed to cover one surface in the axial direction L and two surfaces in the circumferential direction C of the coil end portion 23 of the W phase, the interphase insulating sheet 40 is bent. Positioning when mounting on the end portion 24 becomes easy and mounting is possible in a stable state.

  Further, as shown in FIG. 18, the V-phase coil end portion 23 is disposed on the L1 side in the axially outward side of the interphase insulating sheet 40 having the W-phase coil end portion 23 as the target phase coil end portion. . Thereafter, the U-phase coil end portion 23 is disposed. At that time, the interphase insulating sheet 40 having the U-phase coil end portion 23 as the target phase coil end portion is disposed as shown in FIG. .

  As described above, since the interphase insulating sheet 50A is constituted by the annular sheet member S2 sandwiched between the two bent coil end portions 24, the insulation between the two bent coil end portions 24, that is, the different-phase coil Interphase insulation is ensured. Further, since the interphase insulating sheet 50A is sandwiched between the two bent coil end portions 24, it is possible to prevent the positional displacement of the interphase insulating sheet 50A.

[Other Embodiments]
(1) In the above embodiment, the shape of the interphase insulating sheet 50A is exemplified, but the shape may be appropriately modified.
FIG. 19A is a perspective view of an interphase insulating sheet 50B of another embodiment, and FIG. 19B shows the interphase insulating sheet 50B on the axially outward side of the pair of bending coil end portions 24: L1 side. It is a top view which shows the state arrange | positioned. As shown in the figure, in the interphase insulating sheet 50B, the circumferential length of the protrusion 52 is approximately the same as the circumferential width W1 of the inner circumferential opening 13 that opens on the radially inner side of the slot 12: R1 side. ing. As a result, when the coil 21 is inserted in the axial direction L from the bent coil end portion 24 side, the protruding portion 52 of the interphase insulating sheet 50 can pass through the slot 12 without interference.

FIG. 20 shows an example in which the interphase insulating sheet 50C is formed in an annular shape by connecting a plurality of arc-shaped belt-like members 53 having the same shape to each other in the circumferential direction C at the connection portion 54. The connection between the plurality of arc-shaped strip members 53 at the connecting portion 54 may be performed by bonding with an appropriate adhesive when the arc-shaped strip member 53 is a paper material, and appropriate when the arc-shaped strip member 53 is a resin material. Bonding or welding with an adhesive may be performed. It should be noted that members having different shapes may be included in the plurality of arc-shaped band members 53.
By forming the interphase insulating sheet 50C with a plurality of members, even if a defect such as a defective shape occurs in some members, only the defective member becomes an unusable member, and the other members are combined with another member. Can be used. Therefore, the yield of the interphase insulating sheet 50C as a whole can be improved.

(2) In the above embodiment, the narrow recess 32 is circumferentially arranged so that the cross-sectional area of the cross section perpendicular to the energizing direction of the coil 21 is substantially equal to the cross-sectional area of the cross section in the portion other than the extending projection 33. The case where the extension protrusion 33 is formed by being compressed in C and extended in the axial direction L has been described as an example. However, the embodiment of the present invention is not limited to this. That is, when the extension projection 33 is formed by being compressed in the circumferential direction C and extending in the axial direction L, the cross-sectional area of the cross section perpendicular to the energizing direction of the coil 21 is a cross-section breakage at a portion other than the extension projection 33 One of the preferred embodiments of the present invention is to form a narrow recess 32 as the extension protrusion 33 formed to have a different area.

(3) In the above-described embodiment, the linear conductor 31 is configured by a single rectangular conductor having a substantially rectangular cross section, and its circumferential width W5 is equal to the circumferential width W3 of the slot interior 14. The case where they are formed so as to be substantially equal has been described as an example. However, the embodiment of the present invention is not limited to this. That is, when the semi-open slot is adopted, the circumferential width W5 of the linear conductor 31 only needs to be wider than the circumferential width W1 of the inner circumferential opening 13 of the slot 12, and the circumferential width W1 of the inner circumferential opening 13 is sufficient. To the circumferential width W3 of the slot interior 14 can be arbitrarily set. 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 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). ).

(5) 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.

(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 APPLICATION This invention can be utilized suitably for the interphase insulation sheet for ensuring the interphase insulation between the coils of multiple phases with which the armature for rotary electric machines is equipped.

1 Rotating electrical machine 2 Stator (armature for rotating electrical machine)
11 Stator core (core)
12 Slot 13 Inner peripheral opening 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 24 Bending coil end part 33 Extension protrusion part 50A-50C Interphase insulating sheet 51 Annular part 52 Projection part L Axial direction R Radial direction C Circumferential direction S2 Annular sheet member

Claims (7)

An interphase insulating sheet for securing interphase insulation between a plurality of phase coils provided in an armature for a rotating electric machine,
A coil wound around a substantially cylindrical core in which a plurality of slots extending in the axial direction are distributed in the circumferential direction, and at least one end protruding in the axial direction from the core is bent inward in the radial direction. In addition, the coil end portions of different phases are arranged in the axial direction and the circumferential direction, and a plurality of coils are formed as a bent coil end portion. An interphase insulating sheet constituted by an annular sheet member sandwiched between two bending coil end portions of an armature for a rotating electrical machine arranged side by side in a direction. The coil end portion of each phase constituting the bent coil end portion is a radial conductor portion that is bent from a coil side portion disposed in each slot and extends in the radial direction, and a pair of the radial conductor portions. A circumferential conductor portion extending in the circumferential direction so as to connect,
In a specific portion in the radial direction of the radial conductor portion, an extension projection portion extending in the axial direction is aligned in the axial direction between the plurality of coil end portions constituting the plurality of sets of the bent coil end portions. Formed,
2. The interphase insulating sheet according to claim 1, wherein the annular sheet member is sandwiched by a set of the extension protrusions adjacent in the axial direction. The slot is formed such that the circumferential width of the inner circumferential opening that opens radially inward is narrower than the circumferential width of the slot located radially outward than the inner circumferential opening,
The specific portion where the extension protrusion is formed is a portion corresponding to the inner peripheral opening in the axial direction,
3. The shape according to claim 2, wherein the extension protrusion is formed in a shape recessed with respect to another portion of the radial conductor portion so that a circumferential width of the extension protrusion is narrower than a circumferential width of the inner peripheral opening. Interphase insulation sheet.   The annular sheet member includes an annular portion in which a diameter of an outer peripheral edge is smaller than a diameter of an inner peripheral surface of the core, and a portion protruding from the annular portion radially outward to the extension protrusion portion. The interphase insulating sheet according to claim 2, further comprising at least one protrusion sandwiched between the sets.   The interphase insulating sheet according to claim 4, wherein a circumferential length of the protrusion is a length extending between a plurality of slots arranged in the circumferential direction.   5. The interphase insulating sheet according to claim 4, wherein a circumferential length of the protruding portion is substantially equal to a circumferential width of an inner circumferential opening that opens radially inward of the slot. The armature for a rotating electric machine is wound around in the form of distributed winding in the core, the core having an inner peripheral opening portion in which each slot opens radially inward, and the plurality of slots. A three-phase coil composed of one phase, a second phase and a third phase;
The coil end portion of the second phase has a step portion in the axial direction at an intermediate portion in the circumferential direction, and an inner side portion located on one end side in the circumferential direction and on the inner side in the axial direction from the step portion. And an outer side portion located on the other side in the circumferential direction from the stepped portion and on the outer side in the axial direction,
The coil end portion of the first phase is adjacent to the outer side in the axial direction with respect to the inner side portion of the coil end portion of the second phase, and the outer side of the coil end portion of the second phase. It is arranged adjacent to the side part in the circumferential direction,
The coil end portion of the third phase is adjacent to the inner side in the axial direction with respect to the outer side portion of the coil end portion of the second phase, and the inner end of the coil end portion of the second phase. It is arranged adjacent to the side part in the circumferential direction,
The annular sheet member is a single bent portion configured on an axially outer side of the first-phase coil end portion and an axially outer side of the outer-side portion of the second-phase coil end portion. An axially outward surface of the coil end portion, an axially inward side of the third phase coil end portion, and an axially inward side of the inward side portion of the second phase coil end portion The interphase insulating sheet according to any one of claims 1 to 6, wherein the interphase insulating sheet is sandwiched between an axially inward side surface of the other bent coil end portion.

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