JP2010239737A - Interphase insulating sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a complicated structure of an interphase insulating sheet for securing interphase insulation between coils of a plurality of phases. <P>SOLUTION: The interphase insulating sheet 40A is provided with a plurality of insulating parts 41 arranged in a circumferential direction at prescribed intervals and coupling parts 42 coupling the two insulating parts 41 adjacent in the circumferential direction so as to secure interphase insulation between a coil end 23 in different phase, which is adjacent to an objective phase coil end arranged in the circumferential direction at the prescribed interval, with the coil end 23 of one phase in a plurality of phases as the objective phase coil end. The insulating part 41 has plane insulating parts 41a disposed to confront with the objective phase coil end from an axial direction and side insulating parts 41b formed by bending both end edges in the circumferential direction of the plane insulting part 41a to the axial direction. The plane insulating part 41a covers a part confronted with the coil end 23 with a different phase in the objective phase coil end in the axial direction. The side insulating part 41b covers a part confronted with the coil end 23 with a different phase in the objective phase coil end in the circumferential direction. <P>COPYRIGHT: (C)2011,JPO&amp;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 wound around a substantially cylindrical core. A bent coil end in which at least one end portion protruding in the axial direction from the core of the coil is bent radially inward and coil end portions of different phases are arranged in an axial direction and a circumferential direction. The coil end portion of the armature for a rotating electrical machine, which is a part, is attached to the bending coil end portion, and the coil end portion of one of the plurality of phases is set as a target phase coil end portion at a predetermined interval along the circumferential direction. In order to ensure interphase insulation between the arranged target phase coil end portions and the adjacent coil end portions of different phases, adjacent to the plurality of insulating portions arranged at predetermined intervals along the circumferential direction. A connecting portion for connecting the two insulating portions to each other, and the insulating portion includes a planar insulating portion disposed so as to face the target phase coil end portion from the axial direction, and both circumferential ends of the planar insulating portion. A side insulating portion formed by bending an edge in the axial direction, and the planar insulating portion covers a portion facing the coil end portion of the different phase in the target phase coil end portion in the axial direction, The said side surface insulation part exists in the point which covers at least one part of the part facing the said coil end part of the different phase in the said object phase coil end part in the circumferential direction.
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 said characteristic structure, a plane insulation part covers the part which faces the coil end part of a different phase which is a part of object phase coil end part, and an axial direction. This ensures insulation between the target phase coil end portions facing and adjacent to each other in the axial direction and the coil end portions of different phases.
Further, since the side surface insulating portion covers at least a part of the portion facing the coil end portion of the different phase in the circumferential direction in the target phase coil end portion, the target phase coil end portion is sandwiched from the circumferential direction by the side surface insulating portion. . Thereby, relative movement in the circumferential direction of the insulating portion (that is, the planar insulating portion and the side surface insulating portion) with respect to the target phase coil end portion is prevented. Here, when considering only the insulating portion attached to one target phase coil end portion, the insulating portion may move relative to the target phase coil end portion in the radial direction. That is, if the plurality of insulating portions are not connected to each other, each insulating portion may move in the radial direction. However, according to this characteristic configuration, the insulating portions are connected to each other by the connecting portions and are only allowed to move in the same direction as a unit, and therefore, the insulating portions cannot move in the radial direction. Therefore, the relative movement in the radial direction of the interphase insulating sheet with respect to the target phase coil end portion is also prevented.
Furthermore, according to this characteristic configuration, the shape of the insulating portion is previously formed into a shape that covers one surface in the axial direction and two surfaces in the circumferential direction of the target phase coil end portion. Therefore, the positioning when the interphase insulating sheet is mounted on the bent coil end portion becomes easy and can be mounted in a stable state.
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 armature for a rotating electrical machine is configured to include a plurality of slots extending in the axial direction in a distributed manner in the circumferential direction, and each slot having an inner peripheral opening that opens radially inward. Each of which comprises a core and a three-phase coil composed of a first phase, a second phase and a third phase wound in the form of distributed winding in the plurality of slots, and constitutes the bending coil end portion The coil end portion of the phase includes a radial conductor portion that is bent from the coil side portion disposed in each slot and extends in the radial direction, and a pair of the diameters on the radially inner side from the inner peripheral opening portion. A circumferential conductor portion extending in the circumferential direction so as to connect between the directional conductor portions, and the circumferential conductor portion of the coil end portion of the second phase has a step portion in an axial direction at an intermediate portion in the circumferential direction. And at one side in the circumferential direction from the stepped portion. The inner side portion positioned on the inner side in the axial direction and the outer side portion positioned on the other side in the circumferential direction and on the outer side in the axial direction than the stepped portion, and the first phase The coil end portion is adjacent to the outer side in the axial direction with respect to the inner side portion of the second phase coil end portion, and with respect to the outer side portion of the second phase coil end portion. Arranged adjacent to the circumferential direction, the coil end portion of the third phase is adjacent to the outer side portion of the coil end portion of the second phase axially inward, and The second phase coil end portion is arranged adjacent to the inner side portion in the circumferential direction, and the first phase coil end portion or the third phase coil end portion is the target phase coil. It is preferable that the end portion be configured.

  According to this configuration, among the three-phase coils, the first phase or the third phase coil end portion can be used as the target phase coil end portion, and the interphase insulation can be performed by the interphase insulating sheet between the second phase and the second phase. it can. If both the first phase and the third phase are the target coil end portions, the countermeasure for interphase insulation is applied to the coil end portions of the two-phase coils of the three phases. Insulation is ensured.

When the first phase coil end portion is the target phase coil end portion, the planar insulating portion covers the axially inner side of the first phase coil end portion, and the side insulating portion is Covering at least a part of the circumferential side portion of the first phase coil end portion, and arranging the connecting portion so as to pass the axially outward side of the outer side portion of the second phase coil end portion. And
When the third phase coil end portion is the target phase coil end portion, the planar insulating portion covers the axially outer side of the third phase coil end portion, and the side surface insulating portion is the first phase coil end portion. Covering at least a part of the circumferential side portion of the three-phase coil end portion, and arranging the connecting portion so as to pass through the inner side in the axial direction of the inner side portion of the second-phase coil end portion. A configuration is preferable.

  According to this configuration, the positional relationship between the first phase coil end portion and the second phase coil end portion and the positional relationship between the third phase coil end portion and the second phase coil end portion are It is symmetrical with respect to a plane orthogonal to the direction. That is, the interphase insulating sheet that uses the first phase coil end portion as the target phase coil end portion and the interphase insulating sheet that uses the third phase coil end portion as the target phase coil end portion This can be realized by the interphase insulating sheet having a shape.

  Moreover, it is suitable when the said side surface insulation part is set as the structure which can cover the whole circumferential direction side part of the said coil end part.

  According to this structure, the interphase insulation of the circumferential direction side part of a coil end part can be performed reliably.

  Further, it is preferable that the annular sheet member is formed by bending at a plurality of locations.

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

  In addition, it is preferable that a plurality of arc-shaped belt members having the same shape or different shapes are connected in the circumferential direction to form an annular shape and be bent at a plurality of locations.

  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. Moreover, it becomes easy to make it the shape which covers only the site | part which needs insulation. Therefore, the amount of material used for the interphase insulating sheet can be saved and the cost can be reduced.

  Further, it is preferable that the diameter of the outer peripheral edge is smaller than the diameter of the inner peripheral surface of the core.

  According to this configuration, 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 top, the interphase insulating sheet is inserted between the coil phases in the core state. Can pass through the interior space.

  In addition, it is preferable that a protrusion is provided at a position corresponding to the inner peripheral opening of each slot on the outer peripheral edge.

  According to this configuration, the protrusion of the interphase insulating sheet can pass through the inside of the slot. Therefore, if the diameter of the outer peripheral edge is smaller than the diameter of the inner peripheral surface of the stator core, the interphase insulating sheet is inserted between the coil phases in the interphase insulating sheet other than the protrusions. It can pass through the internal space.

  In addition, it is preferable that the diameter of the outer peripheral edge is larger than the diameter of the inner peripheral surface of the core, and that there is an expansion / contraction portion that can reduce the diameter of the outer peripheral edge.

  According to this configuration, even if the outer peripheral diameter of the interphase insulating sheet is larger than the inner peripheral surface of the core, the coil of each phase is inserted in the axial direction with respect to the slot with the bent coil end portion at the head. When wound, the interphase insulating sheet can be inserted between the coil phases, and the diameter of the outer peripheral edge of the interphase insulating sheet can be reduced by the expansion / contraction portion to pass through the inner space of the core.

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 top 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. 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. 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 of the phase insulation sheet of another embodiment. It is a perspective view of the phase insulation sheet of another embodiment. It is a perspective view of the phase insulation sheet of another embodiment. It is a perspective view of the phase insulation sheet of another embodiment. It is a perspective view of the phase insulation sheet of another embodiment. 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 FIG. 11 is a perspective view of the interphase insulating sheet. Specifically, FIG. 11A is a perspective view of the interphase insulating sheet 40 </ b> A, and FIG. 11B is a perspective view of the interphase insulating sheet 50. FIG. 12 is a plan view for explaining a bent state of the interphase insulating sheet 40A. 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 40A shown in FIG. 11A 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 to be interphase-insulated. is there. That is, the interphase insulating sheet 40 </ b> A 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 40A, 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 40A is formed by bending an annular sheet member S at a plurality of locations, and a plurality of insulating portions 41 arranged at predetermined intervals along the circumferential direction and two insulating portions 41 adjacent in the circumferential direction C. And a connecting portion 42 for connecting the two. 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.

  FIG. 12 illustrates a bent form of the interphase insulating sheet 40A. Specifically, in the case shown in FIG. 12A, the connection portion 42 and the side surface insulating portion 41b are bent on the first line B1 extending radially from the center point of the annular sheet member S, and the side surface insulating portion. Between 41b and the plane insulation part 41a, it is bent on the second line B2 parallel to the first line B1. By bending in this way, the distance between the first line B1 and the second line, that is, the height in the axial direction L of the interphase insulating sheet 40A shown in FIG. Become. In addition, as shown in FIG.12 (b), between the connection part 42 and the side surface insulation part 41b is bent on the 1st line B1 radially extended from the center point of the annular | circular shaped sheet member S, and the side surface insulation part 41b and You may bend on the 3rd line | wire B3 extended radially from the center point of the annular | circular shaped sheet | seat member S between the plane insulation parts 41a.

As shown in FIG. 13, when the interphase insulating sheet 40 </ b> A is attached to the U-phase coil end portion 23 as the target phase coil end portion, the U-phase coil end portion 23 arranged at a predetermined interval along the circumferential direction C. Interphase insulation between the V-phase and W-phase coil end portions 23 adjacent to the U-phase coil end portion 23 in the axial direction L can be ensured. Specifically, the planar insulating portion 41a includes a V-phase coil end portion 23 and a W-phase coil end portion 23 in the U-phase coil end portion 23 ("coil end portions of different phases" in the present invention) and shafts. Cover the part facing the 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, insulation between the W-phase coil end portion 23 and the coil end portions 23 of different phases (U-phase and V-phase) adjacent in the axial direction is ensured.

  The interphase insulating sheet 50 shown in FIG. 11B is provided between each set of the bent 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 interphase insulating sheet 50 has an annular portion 51 whose outer peripheral diameter is smaller than that of the inner peripheral surface of the stator core 11, and extends from the annular portion 51 partially protruding radially outward: R2. And at least one protrusion 52 sandwiched by the set of protrusions 33. And as shown in FIG. 14, the protrusion part 52 of the phase insulation sheet 50 is clamped by the group of the extension protrusion part 33 adjacent to the axial direction L. As shown in FIG. As the material of the interphase insulating sheet 50, 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.

  Both the interphase insulating sheet 40 </ b> A and the interphase insulating sheet 50 have an outer peripheral diameter 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 40A and 50 are inserted between the coil phases. It is possible to pass through the internal space of the stator core 11 in a state.

  Further, as shown in FIG. 14, the U-phase and W-phase bent coil end portions 24 (coil end portions 23) as the target phase coil end portions extend over the entire area in the circumferential direction of the radially outer side: R2 side portion. An outer peripheral side axial step portion 27 having an axial step is provided. And the radial direction outer side: R2 side part of the plane insulation part 41a is arrange | positioned so that the outer peripheral side axial step part 27 of an object phase coil end part may be covered.

  15 to 18 are perspective views for explaining the arrangement state of the interphase insulating sheet between the coils of each phase. 15 to 18 are drawn so that it is easy to understand the positional relationship between the coils 21 of the respective phases and the interphase insulating sheets 40A and 50, and the coils of the respective phases are illustrated. Unlike the actual arrangement, some of the linear conductors are omitted.

  15 shows a state in which the interphase insulating sheet 50 is disposed on the axially outward side: L1 side of the pair of bent coil end portions 24, and FIG. 16 shows the axially outer side of the interphase insulating sheet 50. Side: A state where the W-phase coil 21w is arranged on the L1 side is shown. As illustrated, the protrusion 52 of the interphase insulating sheet 50 is sandwiched from the axial direction L by the extension protrusion 33. As a result, the displacement of the interphase insulating sheet 50 is prevented.

FIG. 17 shows a state in which the interphase insulating sheet 40A 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 C by the side surface insulating portion 41b, the circumferential direction C of the insulating portion 41 with respect to the W-phase coil end portion 23 Relative movement to is prevented. The W-phase coil end portion 23 is not sandwiched between the insulating portions 41 in the radial direction R. However, since the plurality of insulating portions 41 are connected by the connecting portions 42, the plurality of insulating portions 41 are the same as one piece. It is only allowed to move in the direction. Therefore, each insulating part 41 cannot move in the radial direction R, and relative movement in the radial direction R of the interphase insulating sheet 40A with respect to the W-phase coil end part 23 is also prevented.
Further, since the shape of the insulating portion 41 is formed in advance so as 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 40A 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 40A having the W-phase coil end portion 23 as the target phase coil end portion. . Thereafter, the U-phase coil end portion 23 is arranged. At this time, the interphase insulating sheet 40A having the U-phase coil end portion 23 as the target phase coil end portion is arranged as shown in FIG. .

As described above, by using the interphase insulating sheet 40A according to the present invention, insulation between the target phase coil end portion 23 facing and adjacent to the axial direction L and the coil end portion 23 of the different phase is ensured. . Moreover, since the side surface insulating portion 41b covers at least a part of the portion facing the coil end portion 23 of the different phase and the circumferential direction C in the target phase coil end portion 23, the target phase coil end portion 23 becomes the side surface insulating portion 41b. From the circumferential direction C. Accordingly, the relative movement in the circumferential direction C of the insulating portion 41 (that is, the planar insulating portion 41a and the side surface insulating portion 41b) with respect to the target phase coil end portion 23 is prevented. Here, when only the insulating portion 41 attached to one target phase coil end portion 23 is considered, the insulating portion 41 may move relative to the target phase coil end portion 23 in the radial direction R. . That is, if the plurality of insulating parts 41 are not connected to each other, each insulating part 41 may move in the radial direction R. However, according to the present invention, the insulating portions 41 are connected to each other by the connecting portions 42 and are only allowed to move in the same direction as a single unit, and therefore, the insulating portions 41 cannot move in the radial direction R. Therefore, relative movement in the radial direction R of the interphase insulating sheet 40A with respect to the target phase coil end portion 23 is also prevented.
Furthermore, according to the present invention, the shape of the insulating portion 41 is formed in advance so as to cover one surface in the axial direction L and two surfaces in the circumferential direction C of the target phase coil end portion 23. Therefore, the positioning when the interphase insulating sheet 40A is mounted on the bending coil end portion 24 becomes easy and can be mounted in a stable state. In addition, since the interphase insulating sheet 40A does not cover the bending coil end portion 24 from the radial direction R, the refrigerant for cooling the bending coil end portion 24 easily passes from the radial direction R.

[Other Embodiments]
(1) In the above embodiment, the shape of the interphase insulating sheet 40A is exemplified, but the shape may be appropriately modified. 19 to 24 are perspective views of an interphase insulating sheet according to another embodiment.
As shown in FIG. 19, a protrusion 43 is provided on the outer peripheral edge of the interphase insulating sheet 40 </ b> B that partially protrudes radially outward: R <b> 2. The length of the projection 43 in the circumferential direction C is approximately the same as the circumferential width W1 of the inner circumferential opening 13 (see FIG. 3) that opens on the radially inner side of the slot 12: the R1 side. . 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 at the head, the protrusion 43 can pass through the inside of the slot 12. Therefore, the interphase insulating sheet 40 </ b> B only needs to have a diameter of the outer peripheral edge of the portion other than the protrusion 43 smaller than the diameter of the inner peripheral surface of the stator core 11.

FIG. 20 shows a case where an interphase insulating sheet 40C is formed by connecting a plurality of arc-shaped belt-like members 46 having the same shape or different shapes to each other in an annular shape by connecting them in the circumferential direction C at the connection portion 44 and bending them at a plurality of locations It is an example. The connection between the plurality of arc strip members 46 in the connecting portion 44 may be performed by bonding with an appropriate adhesive when the arc strip member 46 is a paper material, and appropriate when the arc strip member 46 is a resin material. Bonding or welding with an adhesive may be performed.
By forming the interphase insulating sheet 40C with a plurality of arc-shaped belt-like members 46, even if a defect such as a defective shape occurs in some members, only the defective member becomes an unusable member. Can be used in combination with members. Therefore, the yield of the interphase insulating sheet 40C as a whole can be improved. In FIG. 20, the arc-shaped belt-like member 46 in which the interphase insulating sheet 40 </ b> C is divided at the connecting portion 42 is shown, but the interphase insulating sheet 40 </ b> C is changed to a form divided at the planar insulating portion 41 a portion. May be.

FIG. 21 shows an example in which the interphase insulating sheet 40D has an expandable portion T that can reduce the diameter of the outer peripheral edge. Specifically, the stretchable part T shown in FIG. 21 is configured by a bent part 45 formed by bending the connecting part 42 into a waveform. That is, when the bent portion 45 is folded in the circumferential direction C, the diameter of the outer peripheral edge of the interphase insulating sheet 40D is reduced. On the other hand, when the bent portion 45 is stretched in the circumferential direction C, the diameter of the outer peripheral edge of the interphase insulating sheet 40D increases. Even if the diameter of the actual outer peripheral edge of the interphase insulating sheet 40D is larger than the inner peripheral surface of the stator core 11, the coil 21 of each phase has an axial direction L relative to the slot 12 with the bent coil end portion 24 at the head. When inserted and wound, the diameter of the apparent outer peripheral edge of the interphase insulating sheet 40D can be passed through the internal space of the stator core 12 in a state where the diameter is reduced by the bent portion 45 (expandable portion T).
Moreover, as an example of the said expansion-contraction part T, it is not limited to the bending part 45 mentioned above, There exists a thing of another form. For example, in the interphase insulating sheet 40 </ b> C shown in FIG. 20, if the arc-shaped belt-like members 46 are not connected to each other at one connection portion 44, the stretchable portion T becomes that portion. That is, the apparent outer peripheral diameter of the interphase insulating sheet can be reduced by increasing the overlap of the arc-shaped strip members 46 in the circumferential direction C at the portion where the arc-shaped strip members 46 are not connected to each other.

The interphase insulating sheet 40E shown in FIG. 22 is different from the interphase insulating sheet described above in the shape of the connecting portion 42. Specifically, the length of the connecting portion 42 in the radial direction R is narrower than the length of the insulating portion 41 in the radial direction R. In this case, the arc belt-shaped member constituting the insulating portion 41 and the arc belt-shaped member constituting the connecting portion 42 may be separately formed, and both may be connected at the connection portion 44. In other words, the interphase insulating sheet 40E is formed by connecting a plurality of arc-shaped belt-like members 41 and 42 having different shapes in the connection portion 44 in the circumferential direction C to form an annular shape and bending at a plurality of locations. By comprising in this way, the material for forming the connection part 42 can be decreased.
In FIG. 22, the connecting portion 42 is connected to the radially outer side of the insulating portion 41: the end portion on the R2 side. However, like the interphase insulating sheet 40 </ b> F in FIG. 23, the connecting portion 42 is connected to the insulating portion 41. You may connect to the radial direction intermediate part. Or you may connect the connection part 42 to other parts, such as the edge part of the radial direction inner side: R1 side of the insulation part 41. FIG.

  Further, as shown in FIG. 24, the length of the side surface insulating portion 41b in the radial direction R is shortened so that the side surface insulating portion 41b covers only a part of the side portion in the circumferential direction C of the target phase coil end portion. It may be configured. In the example of the interphase insulating sheet 40G shown in FIG. 24, the length in the radial direction of the side surface insulating portion 41b is approximately the same as the length in the radial direction R of the connecting portion 42 formed narrow as shown in FIGS. Is formed.

(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 25 Radial direction conductor part 26 Circumferential direction conductor part 33 Extension protrusion part 40A-40F Interphase insulation sheet 41 Insulation part 41a Planar insulation part 41b Side surface insulation part 42 Connection part 43 Protrusion part 45 Bent part (expandable part T)
46 Circular belt member L Axial direction R Radial direction C Circumferential direction S Annular sheet member

Claims (9)

An interphase insulating sheet for securing interphase insulation between a plurality of phase coils provided in an armature for a rotating electric machine,
In the coil wound around the substantially cylindrical core, at least one end portion protruding in the axial direction from the core is bent inward in the radial direction, and the coil end portions of different phases are in the axial direction and the circumferential direction. It is attached to the bending coil end portion of the armature for a rotating electrical machine that is a bending coil end portion that is arranged and aligned in the direction,
The coil end portion of one phase of the plurality of phases as a target phase coil end portion, and the target phase coil end portions arranged at predetermined intervals along the circumferential direction, and the coil end portions of different phases adjacent to each other A plurality of insulating portions arranged at a predetermined interval along the circumferential direction and a connecting portion that connects two insulating portions adjacent in the circumferential direction, in order to ensure interphase insulation between,
The insulating portion includes a planar insulating portion disposed so as to face the target phase coil end portion from the axial direction, and a side insulating portion formed by bending both circumferential edges of the planar insulating portion in the axial direction. Have
The planar insulating portion covers a portion facing the coil end portion of the different phase in the target phase coil end portion in the axial direction,
The said side surface insulation part is an interphase insulation sheet which covers at least one part of the part which opposes the said coil end part of the different phase in the said object phase coil end part in the circumferential direction. The rotary electric machine armature includes the core having a plurality of slots extending in the axial direction and distributed in the circumferential direction and each slot having an inner circumferential opening that opens radially inward. A three-phase coil composed of a first phase, a second phase, and a third phase wound in the form of distributed winding in the plurality of slots,
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 arranged in each slot and extends in the radial direction, and a diameter larger than that of the inner peripheral opening portion. A circumferential conductor portion extending in the circumferential direction so as to connect between the pair of radial conductor portions on the inner side in the direction,
The circumferential conductor portion of 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 is on one side in the circumferential direction and more inward in the axial direction than the step portion. An inner side portion that is positioned and an outer side portion that is positioned 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 interphase insulating sheet according to claim 1, wherein the first phase coil end portion or the third phase coil end portion is the target phase coil end portion. When the first phase coil end portion is the target phase coil end portion, the planar insulating portion covers the axially inner side of the first phase coil end portion, and the side insulating portion is the first phase coil end portion. Covering at least a part of the circumferential side of the one-phase coil end portion, and the connecting portion is arranged to pass through the axially outer side of the outer side portion of the second-phase coil end portion;
When the third phase coil end portion is the target phase coil end portion, the planar insulating portion covers the axially outer side of the third phase coil end portion, and the side surface insulating portion is the first phase coil end portion. Covering at least a part of the circumferential side portion of the three-phase coil end portion, and arranging the connecting portion so as to pass through the inner side in the axial direction of the inner side portion of the second-phase coil end portion. The interphase insulating sheet according to claim 2.   The interphase insulating sheet according to any one of claims 1 to 3, wherein the side surface insulating portion has a size capable of covering the entire circumferential side portion of the coil end portion.   The interphase insulating sheet according to any one of claims 1 to 4, wherein the annular sheet member is formed by bending at a plurality of locations.   The interphase insulating sheet according to any one of claims 1 to 4, wherein a plurality of arc-shaped belt members having the same shape or different shapes are connected in the circumferential direction to form an annular shape and are bent at a plurality of locations.   The interphase insulating sheet according to any one of claims 1 to 6, wherein a diameter of an outer peripheral edge is smaller than a diameter of an inner peripheral surface of the core.   The interphase insulating sheet according to any one of claims 1 to 7, wherein a protrusion is provided at a position corresponding to an inner peripheral opening of each slot on the outer peripheral edge.   The interphase according to any one of claims 1 to 6, wherein the outer peripheral edge has a diameter larger than that of the inner peripheral surface of the core, and has a stretchable portion capable of reducing the diameter of the outer peripheral edge. Insulating sheet.

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