JP2009232607A - Winding for stator of rotating electric machine and rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a winding for a stator of a rotating electric machine which is excellent in a space factor and electric insulation, and to provide the rotating electric machine. <P>SOLUTION: The winding 40 for the stator of the rotating electric machine includes: a linear conductor part 41 having an approximately rectangular cross-sectional shape; and a coating part 42 made of insulating resin formed in the outer periphery of the conductor part 41. The coating part 42 includes: a projection part 422 projected on one surface side of the conductor part 41; and a recessed groove part 423 into which a projection 422 formed on the surface side back facing the one surface side can be inserted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stator winding for a rotating electrical machine and a rotating electrical machine that can obtain high insulation performance and space factor.

  In recent years, rotating electric machines used as electric motors and generators have been required to be small and have high output and improved quality.

  For example, in a rotating electrical machine mounted on a vehicle, a space for mounting the rotating electrical machine in an engine room of the vehicle is becoming smaller, and an improvement in power generation output due to an increase in vehicle load is required. There is also a need for improved reliability.

  As one of the improvements in the performance of a rotating electrical machine, there is a method in which the winding of the stator is replaced with a round wire having a round cross-sectional shape and a rectangular wire having a square cross-sectional shape. When a flat wire is used, the space factor of the coil is improved. That is, no space loss occurs in the rotating electrical machine. Such flat wires are disclosed in, for example, Patent Documents 1 and 2.

  Patent Document 1 discloses an insulated wire (winding) in which an enamel baking layer is formed on the outer periphery of a rectangular cross section and an extrusion-coated resin layer is formed on the outer side thereof.

  Patent Document 2 discloses a rectangular wire (winding) having a coating formed on a rectangular conductor and heated and melted and fixed, and having an engaging portion that engages when the coating is wound. Yes.

  However, in these rotating electrical machines, the windings can be assembled closer to each other, but a sufficient distance between the conductors cannot be ensured to ensure insulation performance. If a sufficient distance between the conductors cannot be secured, a discharge is generated from the exposed conductor of the winding when the coating of the winding is damaged.

Furthermore, since the winding described in Patent Document 2 is made of a material that can be melted by heat, the unevenness of the coating disappears by heat treatment during assembly. As a result, a sufficient distance between the conductors could not be secured.
JP 2005-203334 A JP 2006-100039 A

  This invention is made | formed in view of the said actual condition, and makes it a subject to provide the coil | winding for stators of a rotary electric machine excellent in a space factor and electrical insulation, and a rotary electric machine.

  In order to solve the above-mentioned problems, the present inventors have made studies of the present invention as a result of repeated investigations on the structure of the coating on the outer periphery of the conductor portion of the winding.

  That is, the stator winding of the rotating electrical machine according to the first aspect of the present invention includes a linear conductor portion having a substantially square cross section and a coating portion made of an insulating resin formed on the outer periphery of the conductor portion. In a winding for a stator of a rotating electrical machine having a, the coating portion is inserted with a ridge portion protruding on one surface side of the conductor portion and a ridge formed on the surface side facing away from one surface side. And a possible concave groove.

  A stator winding of a rotating electrical machine according to a second aspect of the present invention is the stator winding according to the first aspect, wherein the stator winding has two or more ridges and concave grooves. .

  A stator winding of a rotating electrical machine according to a third aspect of the present invention is the stator winding according to any one of the first to second aspects, wherein the coating portion of the stator winding has a thickness of at least 50 μm or more. Features.

  According to a fourth aspect of the present invention, there is provided a rotating electrical machine of the present invention using the stator winding of the rotating electric machine according to any one of the first to third aspects.

  In the stator winding according to the first aspect of the present invention, the coating portion is formed on the surface of the ridge portion and the groove portion facing away from each other. When the stator windings are overlapped in a parallel state, the protrusions can be inserted into the recessed groove portions of the adjacent windings. Thereby, the distance between conductor parts can be shortened and a space factor improves. Further, when the stator windings are overlapped in an intersecting state, the protrusions are not inserted into the recessed groove portions. That is, it is possible to ensure at least the total distance between the height of the protrusion and the distance to the opened surface of the groove. Thereby, the distance between conductor parts can be lengthened. As the distance between the conductor portions increases, even if the coating portion is damaged and the conductor portions are exposed, the discharge between the exposed conductor portions is less likely to occur. As a result, when the stator winding according to the present invention is used, an effect that a short circuit due to discharge is less likely to occur is exhibited.

  In the stator winding according to the second aspect of the present invention, two or more ridges and concave grooves are formed. With such a configuration, when the stator windings are overlapped in an intersecting state, the overlapping stator windings come into contact with each other at a plurality of positions in the width direction of the stator windings, and the stator windings are fixed. It tilts with respect to the surface of the child winding and does not overlap.

  In the stator winding according to the third aspect of the present invention, the coating portion has a thickness of at least 50 μm. Thereby, the distance between conductor parts can be made into the distance which can ensure the minimum electrical insulation.

  According to a fourth aspect of the present invention, there is provided a rotating electrical machine according to the present invention using the stator winding of the rotating electrical machine. Since the stator winding described above is a winding that can ensure a high space factor and electrical insulation, the rotating electrical machine of the present invention is a rotating electrical machine having excellent characteristics.

  Hereinafter, the present invention will be specifically described with reference to embodiments.

  As an embodiment of the present invention, first, a stator winding of a rotating electrical machine and a rotating electrical machine using the stator winding were manufactured.

(First embodiment)
The stator winding 40 of the rotating electrical machine according to the present embodiment is used in the rotating electrical machine 1 including the stator 3 including the coil 4 and the stator core 30 and the rotor 2.

  As shown in FIG. 1, the stator winding 40 is formed of a copper conductor 41 and an insulating film 42 made of an insulating resin that covers the outer periphery of the conductor 41 and insulates the conductor 41. . The conductor 41 has a substantially rectangular cross section perpendicular to the direction in which the winding 40 extends. The insulating film 42 covers the outer periphery of the conductor 41.

  The insulating film 42 is formed so as to have a concavo-convex shape on the long side of the rectangular shape. That is, the insulating film 42 has an uneven shape including a thin film portion 420 and a thick film portion 421. In this embodiment, the insulating coating 42 forms a protrusion 422 whose one side protrudes from the center in the width direction on the long side of the rectangle (the other side is a concave groove 423). ). And the uneven | corrugated shape of the surface of the long side which mutually faced the insulating film 42 is a shape symmetrical with respect to an axis | shaft.

  The concave groove 423 has an inner peripheral shape that substantially matches the outer peripheral shape of the protrusion 422. That is, the protrusion 422 can be fitted into the concave groove 423.

  The thickness of the thin film portion 420 of the insulating film 42 is set to 50 μm or more. The thickness of the thick film portion 421 is not particularly limited, and can be appropriately determined depending on the use conditions of the stator winding 40. That is, as the protruding height of the protrusion 422 (or the thickness of the thick film portion 421) increases, the electrical insulation by the insulating film 42 improves, and it becomes possible to flow electricity at a higher voltage to the winding 40. .

  The material of the resin constituting the insulating film 42 is not particularly limited as long as the ridges 422 and the concave grooves 423 disappear due to heat during assembly or subsequent use, and a conventionally known material is used. be able to. For example, a resin having insulating properties such as nylon, polyamideimide, polyphenylene sulfide (PPS), and the like can be given.

  The insulating film 42 may be formed from a single resin layer or a plurality of laminated resin layers. When the insulating film 42 is formed from a plurality of resin layers, the thin film portion 420 and the thick film portion 421 can be formed by adjusting the thickness of at least one of the plurality of resin layers. When the insulating film 42 includes a plurality of resin layers, the amount of the resin material constituting any of the resin layers is not particularly limited.

(Second embodiment)
The stator winding 40 of this embodiment is the same as that of the first embodiment except that the uneven shape of the insulating coating 42 is different. A cross section of the stator winding 40 of this embodiment is shown in FIG.

  The uneven shape of the insulating film 42 in the present embodiment is such that one side of the long side of the rectangular shape is on the other side from the central portion in the width direction on one side of the pair of surfaces having the long side of the rectangular shape. A protrusion 422 protruding from the side is formed (the other side is a concave groove 423). Then, on the other of the pair of surfaces having the long side of the rectangular shape, the central part and both end parts of the long side of the rectangular shape become the thin film part 420 having the thinner insulating film 42 than the other parts. ing. That is, the groove 423 is formed.

(Comparative example)
The stator winding 40 of this comparative embodiment has the same winding as that of the first embodiment, except that the insulating coating 42 is formed with a uniform film thickness on the pair of long sides of the rectangular shape. Is a line. A cross section of the stator winding 40 of this comparative embodiment is shown in FIG.

  The insulating coating 42 of the winding 40 of this comparative embodiment is composed only of the thick film portion 421 of the insulating coating 42 of the winding 40 of the first embodiment.

(Rotating electric machine)
The stator winding 40 of each of the above embodiments is used in the rotating electrical machine 1 including the stator 3 including the coil 4 and the stator core 30 and the rotor 2. Below, the structure of the rotary electric machine 1 using the coil | winding 40 for stators is demonstrated. The configuration of the rotating electrical machine of this embodiment is shown in FIG.

  The rotating electrical machine 1 according to the present embodiment includes a housing 10 in which a pair of substantially bottomed cylindrical housing members 100 and 101 are joined to each other through an opening, and is rotatably supported by the housing 10 via bearings 110 and 111. And a stator 3 fixed to the housing 10 at a position surrounding the rotor 2 inside the housing 10.

  The rotor 2 is formed with a plurality of magnetic poles that are alternately different in the circumferential direction by permanent magnets on the outer peripheral side facing the inner peripheral side of the stator 3. The number of magnetic poles of the rotor 2 is not limited because it varies depending on the rotating electric machine. In this embodiment, an 8-pole rotor (N pole: 4, S pole: 4) is used.

  As shown in FIG. 5, the stator 3 is disposed between the stator core 30, the three-phase coil 4 formed of the stator winding 40, and the stator core 30 and the coil 4. And an insulating paper 5.

  The stator core 30 has an annular shape in which a plurality of slots 31 are formed on the inner periphery. The plurality of slots 31 are formed such that the depth direction thereof coincides with the radial direction. The number of slots 31 formed in the stator core 30 is formed at a ratio of two per one phase of the coil 4 with respect to the number of magnetic poles of the rotor 2. That is, 8 × 3 × 2 = 48 slots 31 are formed.

  The stator core 30 is formed by arranging a predetermined number of divided cores in the circumferential direction. In the present embodiment, there are 24. The split core defines one slot 31 and one slot between the circumferentially adjacent split cores (a tooth core extending radially inward and a back core formed with the teeth) Part).

  The stator core 30 (a divided core constituting the stator core 30) is formed by laminating 410 electromagnetic steel sheets having a thickness of 0.3 mm. An insulating thin film is disposed between the laminated electrical steel sheets. The stator core 30 may be formed not only from the laminated body of electromagnetic steel sheets but also using conventionally known metal thin plates and insulating thin films.

  The coil 4 is formed by forming a large number of substantially U-shaped segments from the stator winding 40 and joining predetermined end portions of the formed many segments. The substantially U-shaped segment includes a linear slot accommodating portion 44 that is accommodated in a slot 31 formed in the stator core 30, and a connection portion 45 that connects the slot accommodating portions 44 to each other. And the edge part of the side in which the connection part 45 of the slot accommodating part 44 is not formed is joined. A segment is joined to another segment without twisting.

  In the present embodiment, the coil 4 is formed to form two three-phase windings (U1, U2, V1, V2, W1, W2), respectively, as shown in FIG.

  The two slot accommodating portions 44 of one segment are accommodated in the slots 31 for each predetermined number of slots (3 phases × 2 = 6 in this embodiment). The connecting portion 45 is formed so as to protrude from the end surface of the stator core 30 in the axial direction.

  The slot accommodating portions 44 accommodated in the slots 31 are accommodated in a state where a plurality are arranged in the depth direction of the slots. At this time, the slot accommodating portion 44 is accommodated in a state of being arranged in the short side direction having a rectangular cross section.

  When the slot accommodating portion 44 is accommodated in the slot 31, all the connecting portions 45 are located on one end side of the stator core 30. That is, the end portion of the segment is disposed on the other end portion side of the stator core 30. The end portion of the segment protruding from the other end face of the stator core is bent in the circumferential direction (in a direction in which the substantially U-shape expands), and the slot accommodating portion 44 is accommodated in another slot separated by a predetermined number of slots. The end of another segment overlaps with the circumferential position. At this time, the radial surfaces (the inner diameter side surface and the outer diameter side surface) of the two segments are brought into contact / joining (welding).

  The form of the coil connection in the rotating electrical machine 1 of this embodiment is shown in FIG. In FIG. 7, the connection form of one phase of the multiphase winding 40 in the coil 4 of the rotating electrical machine 1 of the present embodiment is shown. The portion shown in the in-phase contact in FIG. 7 is a portion where the slot accommodating portion 44 accommodated in the slot 31 overlaps. Moreover, the part shown by the cross contact with the other phase of FIG. 7 is a contact part of the edge parts of the segment of a different phase shown in FIG.

  In the first embodiment and the second embodiment, as shown in FIGS. 9 to 10, the protrusion 422 formed in the slot accommodating portion 44 is fitted into the concave groove 423 of the adjacent slot accommodating portion 44. As a result, the distance between the conductors 41 in the slot 31 is the total thickness of the thin film portion 420 and the thick film portion 421. On the other hand, in the comparative embodiment, as shown in FIG. 11, the distance between the conductors 41 in the slot 31 is the total thickness of the two thick film portions 421. That is, the space factor of the coil 4 became high by using the stator winding 40 of each embodiment.

  The end of the segment intersects with the end of another segment protruding from the adjacent slot 31 in contact. The intersections of the end portions of the segments are made when the surfaces on the inner diameter side and the outer diameter side (surfaces on the long side of the cross-sectional square shape) come into contact with each other. In 1st embodiment and 2nd embodiment, as shown in FIGS. 12-13, by the thickness of each thick film part 421 which divides the protrusion 422 and the ditch | groove 423 of the coil | winding 40 for stators, Spacing between the ends of the segments is ensured. Further, in the comparative example, as shown in FIG. 14, the interval between the end portions of the segments is ensured by the thickness of the thick film portion 421. That is, each embodiment and the comparison form have ensured the distance between the conductors 41 long.

  Furthermore, when the stator winding 40 of the second embodiment is used, two thick film portions 421 are formed on each of the contact surfaces of the two windings 40. As a result, the abutment surface abuts without twisting.

  Since a long distance between the conductors 41 can be secured, even if the insulating coating 42 is damaged and the conductor 41 is exposed, the distance between the exposed conductors 41 is long. As the distance between the exposed conductors 41 increases, a greater potential is required to generate a discharge. That is, high insulation performance can be obtained by using the stator windings 40 of the embodiments and comparative embodiments.

  As described above, it can be seen that the rotating electrical machine using the stator winding 40 of the first embodiment and the second embodiment has a high coil space factor and high electrical insulation.

  In the rotary electric machine 1 described above, the segment is formed from the stator winding 40 of the rotary electric machine of each embodiment, and the coil is formed from this segment. However, the present invention is not limited to this form. That is, a rotating electrical machine including the coil 4 in which the stator winding 40 is wound may be used. Further, the shape of the connecting portion 45 is not particularly limited.

  Further, in each of the above embodiments, the thin film portion 420 and the thick film portion 421 are formed only on the surface defined by the long side of the rectangular shape, and the short side is formed only by the thin film portion 420. The thin film portion 420 and the thick film portion 421 (the protrusion 422 and the concave groove 423) may be formed also on the surface partitioned into two. Such a configuration is effective when the winding has a square cross section.

It is sectional drawing which showed the structure of the coil | winding for stators of the example of 1st embodiment. It is sectional drawing which showed the structure of the coil | winding for stators of the example of 2nd embodiment. It is sectional drawing which showed the structure of the coil | winding for stators of the comparative example. It is the figure which showed the structure of the rotary electric machine of the example of an embodiment. It is the figure which showed the structure of the stator of the rotary electric machine of the example of an embodiment. It is the figure which showed the wiring method of the coil of the rotary electric machine of the example of an embodiment. It is the figure which showed the connection of each phase winding of the coil of the rotary electric machine of the example of an embodiment. It is the enlarged view which showed the structure of the other edge part of the stator of the rotary electric machine of the example of an embodiment. It is sectional drawing which showed the structure of the slot vicinity of the rotary electric machine of 1st embodiment. It is sectional drawing which showed the structure of the slot vicinity of the rotary electric machine of a 2nd embodiment. It is sectional drawing which showed the structure of the slot vicinity of the rotary electric machine of the comparative example. It is the figure which showed the structure of the other edge part vicinity of the stator core of the rotary electric machine of 1st embodiment. It is the figure which showed the structure of the other edge part vicinity of the stator core of the rotary electric machine of 2nd embodiment. It is the figure which showed the structure of the other edge part vicinity of the stator core of the rotary electric machine of the comparative example.

Explanation of symbols

1: Rotating electric machine 10: Housing 110, 111: Bearing 2: Rotor 20: Rotating shaft 3: Stator 30: Stator core 31: Slot 4: Coil 40: Each phase winding 41: Conductor 42: Insulating film 420: Thin film part 421: Thick film part 422: Projection 423: Concave groove 44: Slot accommodating part 45: Connection part 5: Insulating paper

Claims (4)

A linear conductor portion having a substantially rectangular cross section;
A coating portion made of an insulating resin formed on the outer periphery of the conductor portion;
In the stator winding of the rotating electrical machine having
The coating part has a protrusion protruding to one surface side of the conductor part, and a concave groove part formed on the surface side facing away from the one surface side into which the protrusion can be inserted. Winding for a stator of a rotating electric machine characterized by   The stator winding according to claim 1, wherein the stator winding is formed with two or more protrusions and concave grooves.   The stator winding according to claim 1, wherein the coating portion of the stator winding has a thickness of at least 50 μm.   A rotating electrical machine comprising the stator winding of the rotating electrical machine according to claim 1.

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