JP2013055776A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine which can prevent a coil and an insulation paper from being protruded from a slot to a radially inward side, and prevent a magnetic plate from being floated at an axial direction end portion of a stator core consisting of a magnetic plate laminated body.SOLUTION: A stator of a rotary electric machine in which a coil 68 is arranged in a slot 38 of a stator core consisting of a magnetic plate laminated body, includes a wedge member 70 comprising: an intermediate portion 72 which is disposed in the slot 38 to close an aperture 40 in a radially inward side of the stator core; and end portion 74 which is continued to the intermediate portion 72 and protrudes from an axial end face of the stator core to the outside. The end portion 74 of the wedge member 70 hangs over in the circumferential direction and can be latched on the axial end face 37 in the radially inward side of a tooth 36 which is arranged on both sides of the slot 38 in the circumferential direction.

Description

  The present invention relates to a stator of a rotating electrical machine, and more particularly to a stator of a rotating electrical machine in which a coil is inserted and disposed in a slot of a stator core made of a magnetic plate material laminate.

  Conventionally, for example, in Japanese Patent Application Laid-Open No. 2009-11063 (Patent Document 1), in a stator of a rotating electrical machine, coils made of rectangular wires are arranged in a row and inserted into a slot, and thereafter, radially inward of the slot. It is described that a wedge (82) made of an insulating resin or the like is inserted in the opening in the axial direction and closed.

JP 2009-11063 A

  A stator core constituting a stator of a rotating electric machine is formed by laminating a large number of magnetic plate materials such as electromagnetic steel plates punched into a ring shape and connecting them by caulking, welding, or the like. In this case, since the connecting portion such as the caulking is located on the radially outer side, the plate material constituting the axial end surface of the stator core is located on the radially inner side, more specifically, on the radially inner end portion of the teeth portion of the stator core. It may float to the outside in the axial direction. When such lifting occurs, it causes vibration and noise during operation of the rotating electrical machine, and the axial dimension of the stator core increases, leading to an increase in the size of the stator core.

  An object of the present invention is to suppress the lifting of a magnetic plate material at the axial end of a stator core made of a magnetic plate material laminate while preventing the coil and insulating paper from protruding radially inward from the slot in a stator of a rotating electrical machine. It is to provide a stator for a rotating electrical machine.

  A stator of a rotating electrical machine according to the present invention is a stator of a rotating electrical machine in which a coil is disposed in a slot of a stator core made of a magnetic plate laminate, and is located in the slot and has an opening radially inward of the slot. A coil pressing member having an intermediate portion that closes the portion and an end portion that is connected to the intermediate portion and protrudes outward from the axial end surface of the stator core, and the end portion of the coil pressing member projects in the circumferential direction. The teeth can be locked on the axial end surfaces on the radially inner side of the teeth portions located on both sides in the circumferential direction of the slot.

  In the stator of the rotating electrical machine according to the present invention, the coil pressing member may be inserted into the slot by being pushed radially outward from the slot opening.

  According to the stator of the rotating electrical machine according to the present invention, the opening portion on the radially inner side of the slot is closed by the intermediate portion of the coil pressing member, so that the coil and the insulating paper are prevented from jumping out radially inward from the opening portion. it can. Further, the end portion of the coil pressing member projects in the circumferential direction and is locked on the axial end surface on the radially inner side of the teeth portion positioned on both sides in the circumferential direction of the slot, thereby being positioned at the axial end portion of the stator core. Lifting at the tip of the teeth portion of the magnetic plate material can be effectively suppressed. As a result, vibration and noise during the operation of the rotating electrical machine can be reduced, and the axial dimension of the stator core can be suppressed from being increased and downsized.

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 segment conductor which is a unit which constitutes a coil. It is an enlarged view which shows a mode that the insulating paper in a slot is arrange | positioned in the state opened toward the opening part of the slot. It is a top view of the wedge member before being inserted in a slot. It is a partial expansion perspective view which shows the edge part of the wedge member inserted in the slot. It is a figure which shows a mode that the edge part of a wedge member is pinched | interposed and arranged between a coil end part and a stator core.

  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 sectional view in the axial direction of a rotating electrical machine 10 including a stator according to an embodiment of the present invention. As shown in FIG. 1, the rotating electrical machine 10 is provided with a rotor 14 fixed to a rotating shaft 12 provided to be rotatable around a rotation center axis X and a predetermined gap around the rotor 14. The cylindrical stator 16 is provided.

  The rotor 14 is inserted and disposed in a rotor core 18 formed by laminating a plurality of electromagnetic steel plates and a permanent magnet insertion hole 20 formed by extending in the axial direction on the outer peripheral edge side of the rotor core 18. A plurality of permanent magnets 22 and an end plate 24 that clamps the rotor core 18 from both sides in the axial direction are included. 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 that is formed in a cylindrical shape so as to surround the rotor 14, and a coil 30 that is attached to the stator core 28. The stator core 28 is fixed on the inner peripheral surface of the cylindrical case 32. In addition, the stator core 28 is configured by stacking a large number of magnetic plate materials such as electromagnetic steel plates punched into a substantially annular shape in the axial direction and integrally connected by caulking, welding, or the like.

  The coil 30 wound around the stator core 28 includes an in-slot portion disposed in a slot, which will be described later, and coil end portions 31 a and 31 b formed to protrude outward from the axial end surface of the stator core 28. In the present embodiment, the coil end portions 31 a and 31 b on both sides in the axial direction are formed so as to bulge radially inward from the inner peripheral surface of the stator core 28. Further, the coil end portions 31a and 31b are formed in a substantially annular shape when viewed from the axial direction. FIG. 1 shows an example in which the coil end portions 31 a and 31 b on both sides in the axial direction are formed to bulge inward in the radial direction, but only one of the coil end portions is larger than the inner peripheral surface of the stator core 28. It may be formed to bulge radially inward.

  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 36. The slots 38 are also formed in the same number as the teeth portions 36 at intervals in the circumferential direction.

  The magnetic plate members constituting the stator core 28 are connected in a state in which crimped portions (not shown) formed in the yoke portion 34 are fitted to be uneven. Further, when the magnetic plate members are further connected by welding, they are welded along the axial direction on the outer peripheral surface of the stator core 28. Therefore, in the magnetic plate material connected by the yoke portion 34 positioned on the radially outer side in this way, the radially inner portion of the magnetic plate material positioned on the axial end portion of the stator core 28, more specifically, the tooth portion. There is a case where the floating or turning is generated at the tip portion on the radially inner side of 36. In the present embodiment, such lifting of the magnetic plate material is suppressed by the wedge member, which will be described in detail later.

  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.

  The teeth portion 36 of the stator core 28 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 end portion of the main body portion 42. Overhang portions 44 and 45 projecting in the circumferential direction are provided. Thereby, the opening 40 on the radially inner side is defined between the protruding portions 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.

  In the present embodiment, an example is shown in which the circumferential width w of the slot 38 is formed constant in the radial direction, but the present invention is not limited to this. For example, the slot may be formed in a substantially trapezoidal shape whose circumferential width expands outward in the radial direction.

  The inner surface of the slot 38 includes an inner peripheral surface 381 located on the outermost radial direction side, and a side wall surface 382 defined by the side surface of the main body 42 of the tooth portion 36, which is connected to the inner peripheral surface 381. The side wall surface 383 that faces the side wall surface 382 in the circumferential direction, the front wall surface 384 that is connected to the side wall surface 382 on the radially inner side, and the front wall surface that is connected to the side wall surface 383 on the radially inner side 385. Here, the front wall surface 384 is defined by the back surface of the overhang portion 44, and the front wall surface 385 is defined by the back surface of the overhang 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. A peripheral insulating portion 56 that connects the radially outer end, a bent portion 58 that is formed at the other end of the side insulating portion 52 and bends toward the side insulating portion 54, and the side insulating portion 54. And a bent portion 60 which is bent toward the side insulating portion 52 side.

  Here, in the insulating paper 50, the radial length of the side insulating portion 54 is shorter than the radial length of the side 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 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 square wire having a substantially square cross section, and a plurality of (10 in this embodiment) coil wire 68 are arranged in a line in one slot 38. Yes.

  As the coil wire 68 of the present embodiment, a rectangular wire having a rectangular cross section is used, but a square wire having a substantially square cross section may be used. The circumferential width of the coil wire 68 is set to be slightly smaller than the value obtained by subtracting the thickness of the side insulating portions 52 and 54 from the slot width w. That is, when the coil wire 68 is inserted into the insulating paper 50 disposed in the slot 38 from the axial direction, the coil wire 68 can be inserted so as not to contact the inner surface of the insulating paper 50. Furthermore, when a plurality of coil strands 68 arranged in the same slot 38 are pressed radially outward by a wedge member 70 to be described later and brought into close contact with each other without a gap, the coil strands 68 positioned at the innermost peripheral portion The dimensions of the slot 38, the insulating paper 50, and the wedge member 70 are set so that a predetermined distance d is ensured between the radially inner side surface and the radially inner end surface of the tooth portion 36. Yes. By securing such a distance d, the amount of magnetic flux generated from the rotor 14 and interlinked with the coil wire 68 can be reduced, and as a result, the occurrence of coil copper vortex loss can be suppressed.

  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, 16 slots 38 in slots 38 formed in a line of 48 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 segment conductor 100 as a unit of the coil wire 68 constituting the coil 30. The segment conductor 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 with 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. The intermediate portions 102 a and 104 a of the leg portions 102 and 104 constitute a coil wire 68 disposed in the slot 38.

  The leg portions 102 and 104 of the segment conductor 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 segment conductors 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.

  The tip portions of the leg portions 102 and 104 of the segment conductor 100 are bent outward at the other axial end of the stator core 28 as indicated by a broken line 110 in FIG. The leg portions 102 or 104 of the segment conductor 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 leg portions 102 or 104 of the other segment conductors 100 adjacent to each other and the core member 108 are welded to each other, or one leg portion 102 is bent outward while the other leg portion 104 is inward. The other segment conductors 100 and the core members 108 which are bent in the circumferential direction and adjacent in the circumferential direction or the radial direction are welded and connected.

  In this way, the segment conductors 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. One end of each phase coil is connected to the input terminal of the three-phase AC voltage of the rotating electrical machine 10, and the other end of each phase coil is commonly connected at the neutral point.

  Referring again to FIG. 3, a wedge member (coil pressing member) 70 is disposed on the innermost peripheral side in the slot 38. The wedge member 70 closes the opening 40 of the slot 38 in the axial direction. This prevents the coil wire 68 and the insulating paper 50 from jumping inward in the radial direction from the slot 38 during operation of the rotating electrical machine 10 in which the three-phase AC voltage is applied to the coil 30 and the rotor 14 is rotationally driven. Can do. The wedge member 70 also functions as a coil fixing member that fixes the coil 30 to the stator core 28 by pressing the coil wire 68 radially outward through the overlapping portion 62 of the insulating paper 50. it can.

  In the above description, it has been described that the coil 30 is constituted by the coil wire 68 made of a flat wire or a square wire, but the present invention is not limited to this. For example, as shown in FIG. 5, the coil may be constituted by a large number of circular cross-section conductors 69 that are inserted into the slots and wound around the teeth portion. Further, the radially inner end portions of the insulating paper 50 do not necessarily overlap each other, and the end portions 52a and 54a of the side surface insulating portions 52 and 54 are the side wall surfaces 382 and 383 of the slot 38, as shown in FIG. It is good also as a state which opened and opened toward the opening part 40. FIG. By doing so, there is an advantage that the amount of insulating paper used can be reduced and the cost can be reduced.

  FIG. 6 is a plan view of the wedge member 70 before being inserted into the slot 38. As shown in FIG. 6, the wedge member 70 includes an intermediate portion 72 that is located in the slot 38 and closes the opening 40 on the radially inner side of the slot 38, and an end portion 74 that is connected to the intermediate portion 72. Have The wedge member 70 is made of, for example, a flexible plate formed of an insulating resin such as polyetherimide, and forms a rectangular flat plate before being inserted into the slot 38.

  The intermediate portion 72 of the wedge member 70 is formed to have a length L1 corresponding to the axial length of the stator core 28. Thereby, the opening 40 of the slot 38 can be closed over the axial direction. In addition, the wedge member 70 has a pair of cut portions 76a and 76b that define the intermediate portion 72 and the end portion 74 at a predetermined length (for example, approximately the full width) from both side edges in the width direction, which is the horizontal direction in FIG. 1/3). A portion between the pair of cut portions 76 a and 76 b is a connection portion 78 that connects the intermediate portion 72 and the end portion 74. The cut portions 76a and 76b may be formed in a straight line as shown in FIG. 6, or may be formed by being cut into a substantially V shape or a wedge shape.

  In addition, the broken line 79a which connects the back side edge parts of the two notch parts 76a of the longitudinal direction both sides of the intermediate part 72 in the width direction one side of the wedge member 70, and the back side edge parts of the remaining two notch parts 76b are shown. The broken line 79b to be connected becomes a bent line when the wedge member 70 is inserted into the slot 38. In order to facilitate the bending on the broken lines 79a and 79b, a shallow groove may be formed in at least one of the front and back surfaces of the wedge member 70.

  Here, the width M1 of the end portion 74 corresponding to the entire width of the wedge member 70 is formed larger than the circumferential width w of the slot 38 (see FIG. 3). As a result, as described later, when the wedge member 70 is pushed radially outward from the opening 40 and inserted into the slot 38, the end portion 74 of the wedge member 70 protrudes to both sides in the circumferential direction, and the slot 38 It can be locked on the axial end surface on the radially inner side of the teeth portion 36 located on the circumferential direction agency side.

  Further, it is preferable that the width M2 of the connection portion 78 left between the pair of cut portions 76a and 76b in the wedge member 70 is narrower than the width S of the opening 40 of the slot 38 (see FIG. 7). In this way, there is an advantage that the operation of inserting the wedge member 70 into the slot 38 through the opening 40 becomes easy. However, the present invention is not limited to this, and the width M2 of the connecting portion 78 is equal to the width S of the opening 40 of the slot 38 if the resin plate constituting the wedge member 70 has good flexibility. Or a little larger. Thus, the central portion 80 extending in a rectangular shape with the width M2 in the intermediate portion 72 of the wedge member 70 functions as a portion for holding the coil wire 68 in the radial direction by the slot 38. The central portion 80 serving as the coil pressing portion may include the connection portion 78 and a part of the end portion 74.

  FIG. 7 is a partially enlarged perspective view showing an end portion of the wedge member 70 inserted into the slot 38. As shown in FIG. 7, the wedge member 70 is inserted from the radially inner side of the stator core 28 through the opening 40 after the insulating paper 50 and the coil wire 68 are disposed in the slot 38. In this insertion operation, the wedge member 70 is pushed in the direction of arrow B by a pushing tool (not shown).

  When the intermediate portion 72 of the wedge member 70 is about to pass through the opening 40, it can be inserted into the slot 38 by bending along the broken lines 79a and 79b. At this time, the passage of the opening 40 becomes easier by designing the thickness, rigidity, material, etc. so that the central portion 80 of the intermediate portion 72 is elastically deformed and bent.

  When the wedge member 70 passes through the opening 40 and is disposed in the slot 38, the intermediate portion 72 is elastically restored and opened, so that both side edges are on the back surfaces of the protruding portions 44 and 45 of the tooth portion 36, respectively. Engage. At this time, the intermediate portion 72 of the wedge member 70 is pressed by a radially inward springback force received from the coil wire 68 in the slot 38 in a state of being bent into a substantially U shape or a substantially trapezoidal shape. Fixed inside.

  The intermediate portion 72 of the wedge member 70 inserted and arranged in the slot 38 in this manner is fixed in a state where the opening 40 of the slot 38 is closed. Accordingly, it is possible to reliably prevent the coil wire 68 and the insulating paper 50 from protruding out of the slot 38 radially inward and come into contact with the rotating rotor 14.

  On the other hand, as shown in FIG. 7, the end portion 74 of the wedge member 70 protrudes in the axial direction from the slot 38 and protrudes to both sides in the circumferential direction of the slot 38 in more detail on the axial end surface of the stator core 28. Is locked on the axial end surface 37 on the radially inner side of the teeth portion 36 located on both sides in the circumferential direction of the slot 38. As a result, a pressing force can be applied to the magnetic plate material positioned at the axial end of the stator core 28, and the magnetic plate material can be prevented from being lifted or turned up.

  Further, as shown in FIG. 8, the end portion 74 of the wedge member 70 is disposed so as to be sandwiched between the coil end portion 31 a (or 31 b) bulging radially inward and the axial end surface 37 of the stator core 28. If it makes it, the pressing force with respect to the magnetic board | plate material located in an axial direction edge part can be increased. Thereby, the effect of preventing the magnetic plate material from lifting can be more reliably exhibited.

  Furthermore, in the present embodiment, end portions 74 are provided on both sides of the wedge member 70 in the axial direction, and are engaged with end surfaces on both sides of the stator core 28 in the axial direction. Thereby, the axial position of the wedge member 70 with respect to the stator core 28 is accurately determined. Therefore, it is possible to reliably prevent the wedge member 70 from shifting in the axial direction during the operation of the rotating electrical machine 10.

  As described above, according to the stator 16 of the rotating electrical machine 10 of the present embodiment, the opening 40 on the radially inner side of the slot 38 is closed by the intermediate portion 72 of the wedge member 70. It is possible to prevent the insulating paper 50 from jumping out inward in the radial direction. Further, the end portion 74 of the wedge member 70 projects in the circumferential direction and is locked on the axially end surface 37 on the radially inner side of the teeth portion 36 located on both sides in the circumferential direction of the slot 38, thereby the axial direction of the stator core 28. It is possible to effectively suppress the floating at the tip of the teeth portion of the magnetic plate located at the end. Thereby, vibration and noise during operation of the rotating electrical machine 10 can be reduced, and the axial dimension of the stator core 28 can be suppressed from being increased, and the size can be reduced.

  The stator of the rotating electrical machine according to the present invention is not limited to the above-described embodiment and its modifications, and various improvements or changes may be made.

  For example, in the above embodiment, the wedge member 70 has been described as being inserted into the slot from the radially inner side of the stator core. However, the present invention is not limited to this, and the wedge member 70 is inserted into the slot from the axial end surface of the stator core. May be arranged. In this case, the overhang amount of the end of the wedge portion is set small, and the end portion moves while being elastically deformed in an arc shape while being inserted in the slot in the axial direction, and penetrates in the axial direction. When it comes off, it may be elastically restored and locked on the end surface in the axial direction of the tooth portion.

  In the above description, the intermediate portion 72 of the wedge member 70 is described as being disposed in the slot 38 in a state of being bent into a substantially trapezoidal shape, but may be disposed in the slot in a state of being bent in a substantially arc shape. . In this case, the end portion 74 of the wedge member 70 may also be locked to the end surface of the tooth portion in a state where the whole or a part thereof is curved and deformed in a substantially arc shape.

  DESCRIPTION OF SYMBOLS 10 Rotating electric 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, 31a, 31b Coil end part, 32 Case, 34 Yoke part, 36 teeth part, 37 axial end face, 38 slot, 40 opening part, 42 body part, 44, 45 overhang part, 50 insulating paper, 52, 54 side insulation part, 52a, 54a end part, 56 outer circumference Insulating part, 58, 60 bent part, 62 overlapping part, 68 coil element wire, 69 lead wire, 70 wedge member, 72 intermediate part, 74 end part, 76a, 76b notch part, 78 connecting part, 79a, 79b broken line, 80 center Part, 100 segment conductor, 102, 104 leg, 102a, 104a Middle portion, 106 curved portion, 108 core material, 110 broken line, 112 dashed line, 381 inner peripheral surface, 382, 383 side wall surface, 384, 385 front wall surface, d distance, M1, M2, S width, w slot width, X Center axis of rotation.

Claims (2)

A stator of a rotating electrical machine in which a coil is disposed in a slot of a stator core made of a magnetic plate material laminate,
A coil pressing member having an intermediate portion that is located in the slot and closes an opening portion on the radially inner side of the slot, and an end portion that is connected to the intermediate portion and protrudes outward from the axial end surface of the stator core. And a stator of a rotating electrical machine, wherein the end of the coil pressing member projects in the circumferential direction and can be locked on a radially inner end surface in the radial direction of the tooth portion located on both sides in the circumferential direction of the slot. In the stator of the rotating electrical machine according to claim 1,
The stator of a rotating electrical machine, wherein the coil pressing member is pushed radially outward from the slot opening and inserted into the slot.

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