JP2012239322A - Rotary electric machine - Google Patents

Abstract

A rotating electrical machine capable of ensuring the insulation performance of a coil with respect to a stator core while suppressing a decrease in the space factor of the coil in the slot.
An insulating paper 50 and a coil 30 wound around the insulating paper 50 are inserted into a slot 38 of a stator core 28 of a rotating electrical machine. The insulating paper 50 includes side insulating portions 52 and 54 interposed between two side wall surfaces 382 and 383 facing the circumferential direction of the slot 38 and the coil 30, and an inner circumferential surface 381 radially outward of the slot 38. And an outer peripheral insulating portion 56 interposed between the coil 30 and the inner peripheral insulating portion 62 wound around the inner peripheral side of the coil at a position facing the radially inner opening 40 of the slot 38. The side insulating portions 52 and 54 and the outer peripheral insulating portion 56 are formed of a single continuous sheet, while the inner peripheral insulating portion 62 has bent portions 58 and 60 at the ends of the side insulating portions 52 and 54. It is configured as an overlapping part.
[Selection] Figure 3

Description

  The present invention relates to a rotating electrical machine, and more particularly, to a rotating electrical machine that secures insulation performance from a stator core by disposing insulating paper around a coil inserted into a slot of a stator core.

  Conventionally, for example, in Japanese Patent Application Laid-Open No. 2009-195008 (Patent Document 1), in a stator of a rotating electrical machine, a plurality of coil wires made of rectangular wires arranged in a slot are bundled and wound with an insulating material. The overlapping portions are formed by overlapping and welding the end portions, and the overlapping portions of the insulating material are arranged at the intermediate position in the radial direction or the outermost peripheral position in the slot. In this manner, the coil element group arranged in the slot is described.

JP 2009-195008 A

  As described in Patent Document 1, when the overlapping portion of the insulating material is arranged at the radial intermediate position or the radially outermost position in the slot, the space factor of the coil wire in the slot is lowered. It will be.

  The objective of this invention is providing the rotary electric machine which can ensure the insulation performance of the coil with respect to a stator core, suppressing the fall of the coil space factor in a slot.

  A rotating electrical machine according to the present invention includes a rotor that is rotatably provided, and an annular stator that is disposed around the rotor, and the stator is a slot that is formed at intervals in the circumferential direction of the stator. A stator core formed by extending in a radial direction, insulating paper inserted into the slot, and a coil that is insulated from the stator core by being wound around the insulating paper and disposed in the slot. The insulating paper includes first and second side surface insulating portions interposed between the coil and two side surfaces facing the circumferential direction of the stator in the slot, and a radially outer inner surface of the slot. And an outer peripheral insulating part interposed between the coil and an inner peripheral part wound around the inner peripheral side of the coil at a position facing the radially inner opening of the slot, The first and second side insulating portions and the outer peripheral insulating portion are formed by a single continuous sheet, while the inner peripheral portion is a first bent portion formed at an end portion of the first side insulating portion. And a second bent portion formed at an end of the second side surface insulating portion is configured as an overlapping portion.

  In the rotating electrical machine according to the present invention, a radially inner opening of the slot is narrowed by a protrusion protruding in a circumferential direction from a side surface of the slot, and the overlapping portion is radially extended from the opening. The first bent portion and the second bent portion may be pressed and maintained in a closed state by a holding member that is inserted and engaged with the back surface of the protruding portion and disposed in the slot.

  In this case, the holding member may also function as a pressing member that pushes the coil radially outward through the inner peripheral portion of the insulating paper in the slot.

  Further, in the rotating electrical machine according to the present invention, the insulating paper has a folded portion at an end portion in the axial direction of the stator, and a tip end portion of the folded portion abuts against an axial end surface of the stator core, thereby The position of the insulating paper may be determined.

  In this case, the folded portion may be provided at both ends in the axial direction of the insulating paper.

  Further, in the rotating electrical machine according to the present invention, the folded portion formed at the axial end portion of the second bent portion forms the overlapping portion by pressing the inner peripheral surface of the first bent portion. You may help.

  In the rotating electrical machine according to the present invention, the insulating paper may be formed by laminating a foam layer on one surface of an insulating substrate and an adhesive layer on the other surface.

  In the rotating electrical machine according to the present invention, the insulating paper may be made of a porous insulating base material into which an adhesive is immersed.

  Further, in the rotating electrical machine according to the present invention, the insulating paper is configured by adhering a non-working cloth on both surfaces of an insulating base material, and by impregnating the insulating paper with varnish after the stator core is assembled. The coil and the insulating paper may be fixed in the slot.

  Furthermore, in the rotating electrical machine according to the present invention, the insulating paper is made of a porous insulating base material, and the coil and the insulating paper are impregnated by impregnating the insulating paper with varnish after the stator core is assembled. It may be fixed in the slot.

  In the rotating electrical machine according to the present invention, among the first and second side surface insulating portions, the outer peripheral insulating portion, and the inner peripheral portion constituting the insulating paper wound around the coil in the slot, the opening in the radial direction of the slot Only the inner peripheral portion disposed to face the portion is configured as an overlapping portion in which the end portions of the insulating paper overlap each other. In the innermost slot portion of the slot, it is desirable to set a certain distance in order to reduce the vortex loss caused by the magnetic flux generated from the rotor crossing the coil. Even if the overlapping portions of the insulating paper are arranged, the space factor in the slot is not lowered. Therefore, according to this invention, the insulation performance of the coil with respect to a stator core is securable, suppressing the fall of the coil space factor in a slot.

It is sectional drawing of the axial direction of the rotary electric machine which is one embodiment of this invention. It is sectional drawing of the stator core in the AA line shown in FIG. It is sectional drawing which expands and shows one slot in FIG. It is a perspective view of one conducting wire segment which is a unit which constitutes a coil. It is a development top view of insulating paper. It is a side view which shows the bending state of the insulating paper before slot insertion. It is a partial expansion perspective view which shows the insulating paper, coil, and wedge member which are arrange | positioned in a slot. It is a figure similar to FIG. 7 which shows the modification of insulating paper. It is an expansion perspective view of a wedge member. It is a figure which shows the state before inserting a wedge member in a slot. It is a figure which shows the state which inserted and arrange | positioned the wedge member in the slot. It is an expanded sectional view of the innermost peripheral part of a slot. It is a flowchart which shows the manufacturing procedure of a stator. It is a perspective view which shows a mode that insulating paper is inserted in a slot. It is a figure similar to FIG. 12 which shows another embodiment of insulating paper. It is a figure similar to FIG. 12 which shows another embodiment of insulating paper. It is a figure similar to FIG. 12 which shows another embodiment of insulating paper.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like.

  FIG. 1 is a side sectional view of a rotating electrical machine 10 according to an embodiment of the present invention. As shown in FIG. 1, the rotating electrical machine 10 includes a rotor 14 fixed to a rotating shaft 12 provided to be rotatable about a rotation center axis X, and an annular stator 16 provided around the rotor 14. And.

  The rotor 14 includes a rotor core 18 formed by laminating a plurality of electromagnetic steel plates and a plurality of permanent magnet insertion holes 20 formed on the outer peripheral edge side of the rotor core 18 and extending in the rotation center axis X direction. A permanent magnet 22 and an end plate 24 that clamps the rotor core 18 from both sides in the axial direction are provided. The permanent magnet 22 is fixed in the permanent magnet insertion hole 20 with a resin 26.

  The stator 16 includes a stator core 28 formed in an annular shape so as to surround the rotor 14, and a coil 30 attached to the stator core 28. The stator core 28 is fixed in a cylindrical case 32.

  2 is a cross-sectional view of stator core 28 taken along line AA shown in FIG. As shown in FIG. 2, the stator core 28 includes an annular yoke portion 34 extending in the circumferential direction of the stator core 28, and projects radially inward from the inner circumferential surface of the yoke portion 34 toward the rotor 14. And a teeth portion 36 provided with a gap. A slot 38 extending in the radial direction of the stator core 28 is formed between the teeth portions. The slots 38 also extend in the radial direction of the stator core 28 and are formed at intervals in the circumferential direction.

  FIG. 3 is an enlarged sectional view showing one slot 38 in FIG. The slot 38 opens toward the inner peripheral surface of the stator core 28. The opening 40 on the radially inner side of the slot 38 is defined by the end surface on the radially inner side of the tooth portion 36 adjacent in the circumferential direction.

  Here, the teeth portion 36 is formed at a main body portion 42 that protrudes in the radial direction of the stator core 28 from the inner peripheral surface of the yoke portion 34, and a radially inner side end portion of the main body portion 42. Protrusions 44 and 45 projecting in the radial direction are provided. Thereby, the opening 40 on the radially inner side is defined between the protrusions 44 and 45 on both sides, and is formed narrower than the width w of the slot 38 on the radially outer side than the opening 40.

  The inner surface of the slot 38 is an inner peripheral surface (inner surface) 381 positioned on the radially outermost side, and a side defined by the side surface of the main body portion 42 of the tooth portion 36 that is connected to the inner peripheral surface 381. A wall surface (side surface) 382, a side wall surface (side surface) 383 that faces the side wall surface 382 in the circumferential direction, a front wall surface 384 that is continuous with the side wall surface 382 on the radially inner side, and a side on the radially inner side And a front wall surface 385 connected to the wall surface 383. Here, the front wall surface 384 is defined by the back surface of the protruding portion 44, and the front wall surface 385 is defined by the back surface of the protruding portion 45.

  Insulating paper 50 disposed along the inner surface of the slot 38 is inserted into the slot 38 formed in this way. The insulating paper 50 includes a side surface insulating portion 52 extending along the side wall surface 382, a side surface insulating portion 54 extending along the side wall surface 383, a radially outer end of the side surface insulating portion 52, and the side surface insulating portion 54. An outer peripheral insulating portion 56 that connects the radially outer end and a bent portion (first bent portion) 58 that is formed at the other end of the side insulating portion 52 and bent toward the side insulating portion 54 side. And a bent portion (second bent portion) 60 formed at the other end portion of the side surface insulating portion 54 and bent toward the side surface insulating portion 52 side.

  Here, the length in the longitudinal direction (that is, the radial direction) of the side surface insulating portion 54 is shorter than the length in the longitudinal direction of the side surface insulating portion 52. For this reason, the front end side of the bent portion 60 formed at the end of the side surface insulating portion 54 extends on the back side of the bent portion 58 (the side surface on the inner side of the slot 38). As a result, the bent portions 58 and 60 constitute an overlapping portion (inner peripheral portion) 62 that overlaps each other, and the radially inner side of the insulating paper 50 is closed.

  The coil 30 is inserted into the slot 38 in which the insulating paper 50 is inserted. The coil 30 is disposed in a state of being insulated from the stator core 28 by winding an insulating paper 50 around the coil 30. The coil 30 is constituted by a coil wire 68 having a rectangular wire having a substantially rectangular cross section, and a plurality of (10 in this embodiment) coil wire 68 are arranged in a line in one slot 38. Yes.

  The rotating electrical machine 10 according to the present embodiment is supplied with three-phase AC power, and the coil 30 includes a U-phase coil, a V-phase coil, and a W-phase coil. Each of these three-phase coils is accommodated in, for example, eighteen slots 38 in slots 38 formed in a line of 48 pieces in the circumferential direction. In this case, a U-phase coil, a V-phase coil, and a W-phase coil may be sequentially arranged in each slot 38 along the circumferential direction, or an in-phase coil is inserted in each of two adjacent slots 38. And you may arrange | position each phase coil sequentially in the circumferential direction.

  FIG. 4 is a perspective view showing the conductor segment 100 as a unit of the coil wire 68 constituting the coil 30. The conductor segment 100 is formed by bending a rectangular wire having a rectangular cross section into a U shape, and is continuous with two leg portions 102 and 104 extending in parallel to each other and one end portion of each leg portion 102 and 104. And a bending portion 106. For example, a copper core 108 is exposed at the other end of the legs 102 and 104 by removing the insulation coating. A part of the leg portions 102 and 104 or the intermediate portions 102 a and 104 a constitute a coil wire 68 disposed in the slot 38.

  The leg portions 102 and 104 of the conductor segment 100 having such a shape are inserted from one end side in the axial direction of the stator core 28 into the insulating paper 50 inserted into the two slots 38 spaced in the circumferential direction. The plurality of conductor segments 100 are sequentially inserted into the two slots 38 in the same manner and arranged in the radial direction, so that the coil strands 68 are aligned and inserted into the slots 38. . At this time, the tip portions of the leg portions 102 and 104 protrude from the other axial end surface of the stator core 28.

  Then, the distal end portions of the leg portions 102 and 104 of the conductor segment 100 are bent outward at the other axial end of the stator core 28 as indicated by a broken line 110 in FIG. The legs 102 or 104 of the conductor segment 100 and the core member 108 are welded to each other, or are bent inward as indicated by a one-dot chain line 112 in FIG. The cores 108 of the legs 102 or 104 of another conductor segment 100 adjacent to each other are welded to each other, or one leg 102 is bent outward while the other leg 104 is inward. And welded to another conductor segment 100 adjacent in the circumferential direction or radial direction.

  Thus, the conductor segments 100 arranged in the slots 38 are sequentially electrically connected to form a U-phase coil, a V-phase coil, and a W-phase coil, and one end portion of each phase coil is the three-phase of the rotating electrical machine 10. The AC power input terminals are connected to each other, and the other end portions of the respective phase coils are commonly connected at a neutral point.

  FIG. 5 is a developed plan view of the insulating paper 50 before being inserted into the slot 38. The insulating paper 50 is configured by bending a substantially rectangular insulating sheet 51.

  The insulating sheet 51 includes four valley fold lines 53a, 53b, 53c, and 53d that are parallel to the short side direction. When the insulating sheet 51 is valley-folded on each of the valley fold lines 53a, 53b, 53c, and 53d, a cylindrical insulating paper 50 having a flat, substantially rectangular parallelepiped inner space is formed as shown in FIG. become.

  Here, the region between the valley fold lines 53a and 53b is a portion that becomes the side surface insulating portion 52, the region between the valley fold lines 53c and 53d is the portion that becomes the side surface insulating portion 54, and the region between the valley fold lines 53b and 53c is This is a portion that becomes the outer peripheral insulating portion 56. Further, an end portion outside the valley fold line 53 a is a portion that becomes the bent portion 58, and an end portion outside the valley fold line 53 d is a portion that becomes the bent portion 60.

  As shown in FIGS. 5 and 6, the longitudinal length L <b> 2 of the side surface insulating portion 54 is shorter than the longitudinal length L <b> 1 of the side surface insulating portion 52. Accordingly, when the insulating sheet 51 is bent to form the insulating paper 50, the bent portion 58 provided continuously with the side insulating portion 52 is disposed outside the bent portion 60 provided continuously with the side insulating portion 54. The overlapping state of the bent portions 58 and 60 in the overlapping portion 62 is made uniform between the slots 38.

  Further, the length or width L4 of the bent portion 58 is longer than the length or width L5 of the bent portion 60. This also ensures that the bent portion 58 overlaps from the outside of the bent portion 60 when the insulating sheet 51 is bent to form the insulating paper 50.

  The length L3 between the valley lines 53b and 53c is set slightly shorter than the width w of the slot 38. As a result, the width of the outer peripheral insulating portion 56 of the bent insulating paper 50 is formed slightly smaller than the opening width w of the slot 38, so that the operation of inserting the insulating paper 50 from the axial opening of the slot 38 is easy. Can be.

  Even if the width of the outer peripheral insulating portion 56 is made smaller than the width w of the slot 38 as described above, the insulating paper 50 includes the foamed layer as will be described later. By expanding, the space between the insulating paper 50 and the stator core 28 can be filled without a gap.

  As shown in FIG. 5, the insulating sheet 51 further includes two mountain fold lines 55a and 55b parallel to the long side direction. A folded portion 57 is formed at the end of the insulating paper 50 in the axial direction by folding the insulating sheet 51 on the mountain fold lines 55a, 55b before or after the valley fold. The function of this folding portion 57 will be described later.

  Further, the length H1 in the longitudinal direction (corresponding to the axial direction) of the insulating sheet 51 excluding the folded portion 57 is a value obtained by subtracting the width (2 × H2) of the folded portion 57 at both ends from the length H1. It is set to be substantially the same as the axial length of 28. As a result, when the folded insulating paper 50 is inserted into the slot 38, as shown in FIG. 7, the front end portions 57a of the folded portions 57 formed at both ends are formed on both end surfaces in the axial direction of the stator core 28. Specifically, they are in contact with both end surfaces in the axial direction of the main body portion 42 of the teeth portion 36.

  Furthermore, the insulating sheet 51 has four rectangular portions 59a, 59b, 59c, 59d indicated by hatching in FIG. As a result, when the insulating paper 50 is bent and formed, bent portions 58 and 60 are not formed in the bent portions 58 and 60 at the portions protruding outward in the axial direction from the openings of the slots 38.

  However, the present invention is not limited to this, and the folded portions are formed in the bent portions 58 and 60 using the insulating sheet 51 in a rectangular shape without cutting the four corner portions 59a, 59b, 59c, and 59d. You may make it do.

  Alternatively, two corners 59a and 59b continuous to the bent portion 58 are cut off, while a cut having a length H2 is formed on the valley fold line 53d without cutting the two corner portions 59c and 59d continuous to the bent portion 60. May be. In this case, as shown in FIG. 8, the folded portion 57 b formed at the end in the axial direction of the bent portion 60 presses the inner peripheral surface of the bent portion 58, thereby forming the overlapping portion 62 of the bent portions 58 and 60. Can help. As a result, it is possible to insert the insulating paper 50 into the slot 38 while maintaining the bent portions 58 and 60 in an overlapping state. As a result, the bent portions 58 and 60 protrude into the slot to insert the coil. Sometimes, interference with the coil wire 68 can be avoided.

  Referring to FIG. 3 again, a wedge member 70 having a mountain shape is attached to the innermost peripheral side in the slot 38. The wedge member 70 is a holding member that presses the bent portions 58 and 60 of the insulating paper 50 disposed in the slot 38 toward the back of the slot, that is, radially outward. Thus, the bent portion 58 is held in a state of being overlapped and closed on the bent portion 60.

  The wedge member 70 is preferably integrally formed with an insulating resin such as polyetherimide. Further, as shown in FIG. 9, the wedge member 70 includes a flat bottom portion 72 and overhang portions 74 and 76 provided on both sides of the bottom portion 72, and has a substantially U-shaped or substantially trapezoidal end surface. And has a cross section. In addition, the wedge member 70 is formed to have substantially the same length as the axial length of the stator core 28, that is, the axial length of the slot 38, and extends over the entire length of the slot 38.

  As shown in FIG. 10, the wedge member 70 is formed on the inner periphery of the stator core 28 after the insertion of the coil wire 68 constituting the coil 30 is completed inside the insulating paper 50 arranged in the slot 38. It is inserted into the slot 38 from the opening 40. The insertion of the wedge member 70 can be suitably performed using a pushing jig 78 having a width smaller than that of the opening 40.

  When the wedge member 70 is pushed through the opening 40, the overhanging portions 74, 76 and / or the bottom 72 are elastically deformed to narrow the width, thereby passing through the opening 40 and being inserted into the slot 38. Can.

  The wedge member 70 that has passed through the opening 40 in this manner returns to its original shape with the overhang portions 74 and 76 elastically expanding. Then, as shown in FIG. 11, the bottom portion 72 of the wedge member 70 presses the coil wire 68 radially outward via the overlapping portion 62 of the insulating paper 50, and the tip portions of the overhang portions 74 and 76. Engage with the back surfaces of the protrusions 44 and 45 that define the opening 40, respectively.

  The wedge member 70 arranged in the slot 38 in this way not only functions to form the overlapping portion 62 described above, but also functions as a pressing member that pushes the coil wire 68 toward the back of the slot in the slot 38. To do. As a result, a predetermined distance d (see FIG. 3) can be secured between the inner peripheral tip surface of the tooth portion 36 and the coil element wire 68 located on the innermost peripheral side in the slot 38. As a result, coil vortex loss caused by the interlinkage magnetic flux from the rotor 14 can be suppressed.

  Further, the coil element wire 68 disposed in the slot 38 is pressed radially outward by the pressing function of the wedge member 70, whereby the coil element wires 68 in close contact with each other are firmly fixed in the slot 38, As a result, the coil 30 is attached to the stator core 28 in a stable state.

  Further, the wedge member 70 is disposed so as to close the opening 40 of the slot 38 as described above, so that a part of the coil wire 68, the insulating paper 50, the varnish, and the like protrudes radially inward from the slot 38. Can be reliably prevented.

  In addition, the shape of the wedge member 70 is not limited to the above-described one, and may be any shape as long as it has an equivalent function. For example, although it has been described above that it has a substantially U-shaped end surface and a cross section, other shapes such as a substantially U shape, a substantially V shape, and a substantially semicircular shape may be used.

  Next, the layer structure of the insulating paper 50 will be described with reference to FIG. FIG. 12 is a partially enlarged cross-sectional view of the innermost peripheral portion of the slot 38.

  The insulating paper 50 has a three-layer structure formed by laminating a foam layer 82 on one surface of a sheet-like insulating substrate 80 and an adhesive layer 84 on the other surface. In this case, the foam layer 82 is directed to the stator core 28 side, and the adhesive layer is directed to the coil 30 side.

  For the insulating substrate 80, for example, a resin film such as polyethylene naphthalate is preferably used. Further, the foam layer 82 is preferably formed of, for example, an epoxy-based foam resin material, and the adhesive layer 84 is preferably formed of, for example, an unsaturated polyester-based resin material.

  The foamed layer 82 of the insulating paper 50 foams and expands in the thickness direction when the stator core 28 assembled with the insulating paper 50, the coil 30 and the wedge member 70 is heat-treated, whereby the adhesive layer 84 is pressed against the coil 30 side. As a result, the insulating paper 50 is firmly fixed to the coil 30.

  Further, since the foam layer 82 also has adhesive performance, it is firmly fixed to the stator core 28 by being pressed against the inner wall surface of the slot 38 by its own foaming. As a result, the coil 30 is firmly fixed to the stator core 28 via the insulating paper 50.

  Further, the overlapping portion 62 of the insulating paper 50 is firmly bonded to the bent portion 60 by the adhesive layer 84 of the bent portion 58 by the heat treatment. Thereby, the overlapping part 62 of the insulating paper 50 is maintained in a firmly closed state.

  Next, a method for manufacturing the stator 16 of the rotating electrical machine 10 will be described with reference to FIGS. FIG. 13 is a flowchart showing the manufacturing procedure of the stator 16, and FIG. 14 is a perspective view showing how the insulating paper 50 is inserted into the slot 38.

  Referring to FIG. 13, first, in step S10, the insulating paper 50 is processed. Here, as described above with reference to FIGS. 5 and 6, the insulating sheet 51 is cut out from the belt-like base material, the corners 59 a to 59 d of the insulating sheet 51 are cut off, and the valley fold lines 53 a to 53 d and the mountain fold lines 55 a. , 55b, the insulating paper 50 folded into a flat rectangular cylinder is obtained.

  Next, in step S12, the insulating paper 50 processed in this way is inserted into the slot 38 of the stator core 28 from the axial opening as shown in FIG. At this time, the folded portion 57 positioned on the front end side of the insertion is inserted while sliding on the side wall surfaces 382 and 383 of the slot 38 while being pressed against the side surface insulating portions 52 and 54. Does not interfere with work.

  As shown in FIG. 7, when the front end portion 57 a of the folded portion 57 located on the insertion rear end side comes into contact with one axial end surface of the teeth portion 36 of the stator core 28, the axial position of the insulating paper 50 is determined. The insertion work is completed. At this time, the folded-back portion 57 on the insertion front end side slightly spreads outward due to its own elastic force that the insulating sheet 51 has when passing through the slot 38. Thereby, the front end portion 57a of the folded portion 57 on the insertion front end side can be brought into contact with or engaged with the other axial end surface of the tooth portion 36, thereby restricting the movement of the insulating paper 50 to the side opposite to the insertion direction. Is done. As a result, the axial position of the insulating paper 50 with respect to the stator core 28 is substantially determined, so that the insulating paper 50 can be prevented from shifting in the axial direction regardless of the coil insertion direction.

  In this embodiment, the folded portions 57 are provided at both ends of the insulating paper 50. However, the present invention is not limited to this, and the folded portions 57 are provided only at the ends of the insulating paper 50 on the rear end side in the coil insertion direction. It may be provided. Thereby, the axial direction length of the insulating sheet 51 can be made small, and cost reduction can be aimed at. This effect becomes more remarkable as the number of slots 38 formed in the stator core 28 increases. Even in this case, when the insulating paper 50 is inserted into the slot 38, the insulating paper 50 can be positioned with respect to the stator core 28, and the conductor segment 100 constituting the coil 30 is inserted in the same direction as the inserting direction of the insulating paper 50. In this case, the insulating paper 50 can be prevented from shifting in the axial direction because the tip end portion of the folded portion 57 is engaged with the end surface of the tooth portion 36.

  Next, in step S <b> 14, the coil 30 is inserted into the slot 38. Specifically, the conductor segment 100 constituting the coil 30 is inserted and arranged inside the insulating paper 50 arranged in the slot 38. Then, by bending and connecting the leg portions 102 and 104 of the conductor segment 100, the coil 30 including the U-phase coil, the V-phase coil, and the W-phase coil is formed.

  After the coil 30 is inserted into the slot 38 in this way, the wedge member 70 is inserted into the slot 38 in the subsequent step S16. As described above with reference to FIGS. 10 and 11, the wedge member 70 is inserted and attached through the opening 40 from the radially inner side of the slot 38.

  In subsequent step S18, the stator core 28 to which the insulating paper 50, the coil 30, and the wedge member 70 are assembled is subjected to a heat treatment. Thereby, in the insulating paper 50, for example, the adhesive layer 84 made of a thermoplastic resin is melted to exhibit a strong adhesive performance, and the foamed layer 82 is expanded and expanded, whereby the insulating paper 50 is expanded to the inner wall surface of the slot 38. 381, 382, 383 and the coil wire 68 are pressed and firmly bonded. As a result, the coil 30 is firmly fixed to the stator core 28 via the insulating paper 50.

  In this way, the manufacture of the stator 16 including the stator core 28, the coil 30, the insulating paper 50, and the wedge member 70 is completed.

  As described above, according to the rotating electrical machine 10 of the present embodiment, the side insulating portions 52 and 54, the outer peripheral insulating portion 56, and the inner peripheral portion constituting the insulating paper 50 wound around the coil 30 in the slot 38. Of the corresponding overlapping portion 62, only the overlapping portion 62 arranged to face the opening 40 on the radially inner side of the slot 38 is formed by overlapping the bent portions 58 and 60 of the insulating paper 50. Here, in the innermost peripheral portion of the slot 38, it is desirable to set a certain distance d in order to reduce eddy loss caused by the magnetic flux generated from the rotor 14 crossing the coil wire 68 of the coil 30. Therefore, even if the overlapping portion 62 of the insulating paper 50 as described above is disposed on the innermost peripheral portion of the slot 38, the space factor, which is the ratio of the cross section of the coil wire 68 to the area of the slot 38, is reduced. Never do. Therefore, according to the rotating electrical machine 10 of the present embodiment, it is possible to ensure the insulation performance of the coil 30 with respect to the stator core 28 while suppressing a decrease in the space factor in the slot 38.

  Next, a modified example of the insulating paper 50 will be described with reference to FIGS. 15 to 17. However, since the constituent elements other than the insulating paper 50 are the same as those described above, the same reference numerals are used for overlapping description. Omitted by support.

  FIG. 15 is a view similar to FIG. 12 showing a first modification of the insulating paper 50. The insulating paper 50 of this modified example is composed of a porous insulating base material 86 in which an adhesive is soaked. Thus, if the insulating paper 50 is made into a single layer structure and the adhesive is soaked in, the manufacturing cost can be reduced as compared with the insulating paper having the three-layer structure in the embodiment.

  FIG. 16 is a view similar to FIG. 12 showing a second modification of the insulating paper 50. The insulating paper 50 of this modified example is configured by attaching unemployed fabrics 90 and 92 to both surfaces of an insulating base 88 made of a resin film such as polyethylene naphthalate. The coil 30 and the insulating paper 50 are fixed in the slot 38 by impregnating the insulating paper 50 with the varnish 94 and curing it after the heat treatment of the stator core 28. In this case, the insulating paper 50 is impregnated with varnish, and the varnish is filled between the insulating paper 50 and the coil 30 and the stator core 28 without any gap, so that the electric insulation performance and the solidity between the coil 30 and the stator core 28 are improved. The wearing power can be further improved.

  FIG. 17 is a view similar to FIG. 12 showing a third modification of the insulating paper 50. The insulating paper 50 of this modification is composed of a porous insulating base material 96. Instead of the heat treatment of the stator core 28, the insulating paper 50 is impregnated with varnish and cured, whereby the coil 30 and the insulating paper 50 are formed. It is fixed in the slot 38. Also according to this modification, the insulating paper 50 is impregnated with varnish, and the insulating paper 50 is filled with the varnish between the coil 30 and the stator core 28, so that the electric insulation between the coil 30 and the stator core 28 is achieved. Performance and adhesion can be further improved.

  The insulating paper in the rotating electrical machine according to the present invention is not limited to those in the above-described embodiment and modifications, and various improvements or changes may be made.

  For example, the insulating paper 50 according to the above embodiment has been described as having the folded portion 57 at the end in the axial direction, but may not have the folded portion. In this case, it is sufficient for the insulating paper to have at least an axial length equivalent to that of the stator core, and it does not have to protrude outward from the end face of the stator core, or an axial end where no folded portion is formed. It is good also as a structure which a part protrudes outside from the end surface of a stator core.

  Further, in the insulating paper 50 of the above-described embodiment, it has been described that the bent portions 58 and 60 are fixed to each other by the adhesive layer 84. However, the present invention is not limited to this, and the bent portion 58 and 60 is bent only by being pressed by the wedge member 70. The overlapping state of the portions 58 and 60 may be maintained.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Rotating shaft, 14 Rotor, 16 Stator, 18 Rotor core, 20 Permanent magnet insertion hole, 22 Permanent magnet, 24 End plate, 26 Resin, 28 Stator core, 30 Coil, 32 Case, 34 York part, 36 Teeth part , 38 slots, 40 openings, 42 body parts, 44, 45 protrusions, 50 insulation paper, 51 insulation sheets, 52, 54 side insulation parts, 53a, 53b, 53c, 53d valley fold lines, 55a, 55b mountain fold lines, 56 Outer peripheral insulating part, 57, 57b Folded part, 57a Tip part, 58, 60 Bent part, 59a, 59b, 59c, 59d Corner part, 62 Overlapping part or inner peripheral insulating part, 68 Coil wire, 70 Wedge member, 72 Bottom part 74,76 Overhanging part, 78 Indentation jig, 80,88 Insulating base material, 8 2 Foamed layer, 84 Adhesive layer, 86,96 Porous insulating substrate, 90,92 Non-woven cloth, 94 Varnish, 100 Conductor segment, 102,104 Leg part, 102a, 104a Partial or intermediate part, 106 Curved part, 108 core material, 381 inner peripheral surface, 382, 383 side wall surface, 384, 385 front wall surface, d distance, L1-L5 length or width, H1, H2 length or width, w width, X rotation center axis.

Claims (10)

A rotor provided rotatably,
An annular stator disposed around the rotor,
The stator is wound around the stator core formed by radially extending slots formed at intervals in the circumferential direction of the stator, insulating paper inserted into the slots, and the insulating paper. A coil that is insulated from the stator core and disposed in the slot,
The insulating paper includes first and second side surface insulating portions interposed between the coil and two side surfaces facing the circumferential direction of the stator in the slot, the radially inner surface of the slot, and the An outer peripheral insulating portion interposed between the coil and an inner peripheral portion wound around the inner peripheral side of the coil at a position facing the radially inner opening of the slot; The two side surface insulating portions and the outer peripheral insulating portion are formed by a single continuous sheet, while the inner peripheral portion is formed by an end portion of the first side surface insulating portion and the second bent portion and the second A rotating electrical machine configured as an overlapping portion in which a second bent portion formed at an end of a side surface insulating portion overlaps. In the rotating electrical machine according to claim 1,
A radially inner opening of the slot is narrowed by a protrusion protruding in a circumferential direction from a side surface of the slot, and the overlapping portion is inserted in the radial direction from the opening to be back of the protrusion. The rotating electric machine is characterized in that the first bent portion and the second bent portion are pressed and maintained in a closed state by a holding member disposed in the slot by engaging with the. The rotating electrical machine according to claim 2,
The rotating electric machine according to claim 1, wherein the holding member also functions as a pressing member that pushes the coil radially outward through an inner peripheral portion of the insulating paper in the slot. In the rotating electrical machine according to any one of claims 1 to 3,
The insulating paper has a folded portion at an end portion in the axial direction of the stator, and a position of the insulating paper with respect to the stator core is determined by abutting a tip portion of the folded portion with an axial end surface of the stator core. A rotating electric machine that is characterized. In the rotating electrical machine according to claim 4,
The rotating electric machine according to claim 1, wherein the folded portion is provided at both axial ends of the insulating paper. In the rotating electrical machine according to claim 4 or 5,
A rotating electrical machine characterized in that a folded portion formed at an end portion in the axial direction of the second bent portion assists in forming the overlapping portion by pressing an inner peripheral surface of the first bent portion. In the rotary electric machine according to any one of claims 1 to 6,
The rotating electric machine is characterized in that the insulating paper is formed by laminating a foam layer on one surface of an insulating base material and an adhesive layer on the other surface. In the rotary electric machine according to any one of claims 1 to 6,
The rotating electric machine is characterized in that the insulating paper is made of a porous insulating base material into which an adhesive is immersed. In the rotary electric machine according to any one of claims 1 to 6,
The insulating paper is configured by adhering unemployed cloth on both surfaces of an insulating base material, and the coil and the insulating paper are placed in the slot by impregnating the insulating paper with varnish after the stator core is assembled. Rotating electric machine characterized by being fixed to. In the rotary electric machine according to any one of claims 1 to 6,
The insulating paper is composed of a porous insulating base material, and the coil and the insulating paper are fixed in the slot by impregnating the insulating paper with varnish after the stator core is assembled. Rotating electric machine.

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