Stator structure of generator

Abstract

To provide a stator structure of a generator that suppresses positional deviation in an axial direction between split cores.SOLUTION: A stator structure of a generator includes: a plurality of split cores arranged in a circumferential direction; an attachment overlapping with an axial end surface of at least two adjacent split cores among the plurality of split cores; and a plurality of coils wound about the plurality of split cores and the attachment.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a stator structure for use in a generator. [Background technology]

[0002] Patent Document 1 discloses a generator in which a stator core is formed by arranging a plurality of split cores in the circumferential direction. In Patent Document 1, between two split cores adjacent to each other in the circumferential direction, a recessed portion provided on one split core is fitted into a protruding portion provided on the other split core. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-176902 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration disclosed in Patent Document 1, the multiple split cores may be misaligned in the axial direction.

[0005] In view of the above, an object of one aspect of the present disclosure is to provide a stator structure for a generator that suppresses axial positional deviation of the split cores. [Means for solving the problem]

[0006] One aspect of the present disclosure is a stator structure of a generator comprising a plurality of split cores arranged in a circumferential direction, an attachment that overlaps with axial end faces of at least two adjacent split cores among the plurality of split cores, and a plurality of coils wound around the plurality of split cores and the attachment. Effect of the Invention

[0007] According to one aspect of the present disclosure, it is possible to suppress misalignment in the axial direction between two divided cores adjacent in the circumferential direction. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a generator including a stator structure according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view of a stator structure of the generator of FIG. 1. [Diagram 3] 3 is a perspective view of a split core, an attachment, and a coil in the stator structure of FIG. 2. [Figure 4] 4 is a cross-sectional view of a portion of the split core in FIG. 3 around which a coil is wound. [Diagram 5] 13 is a perspective view of a holder and a split core before being attached to the split core in a stator structure according to a second embodiment. FIG. [Figure 6] 6 is a perspective view of the split core in FIG. 5 with a holder attached thereto and an attachment being attached thereto. FIG. [Figure 7] 6 is a perspective view of the split core in FIG. 5 with the holder and attachment attached thereto and a coil wound thereon; FIG. [Figure 8] FIG. 11 is a perspective view of a pair of halves of a stator structure according to a third embodiment. [Figure 9] 9 is a perspective view of a holder and a divided core formed by a pair of halves in FIG. 8. FIG. [Figure 10] FIG. 13 is a perspective view of a pair of halves of a stator structure according to a fourth embodiment. [Figure 11] 11 is a perspective view of a holder and a divided core formed by a pair of halves in FIG. 10. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the stator structure of the generator according to the embodiment will be described with reference to the drawings. In this disclosure, the direction along the rotation axis X is defined as the axial direction D1, the direction in which the multiple split cores 6 are arranged is defined as the circumferential direction D2, and the radial direction of a circle centered on the rotation axis X is defined as the radial direction D3.

[0010] (First embodiment) 1 is a cross-sectional view of a generator 2 including a stator structure 1A according to a first embodiment. In this embodiment, the generator 2 is, for example, a generator provided inside a gas turbine engine. However, the generator 2 may be provided in other equipment.

[0011] In this embodiment, a generator 2 provided inside a gas turbine engine will be described. The gas turbine engine has a rotating shaft 3 extending in an axial direction D1 (FIG. 2). A rotor 4 is connected to the rotating shaft 3, and a stator structure 1A is arranged radially outside the rotor 4. A rotation axis X of the rotor 4 coincides with a rotation axis of the rotating shaft 3. The rotating shaft 3 is inserted into a hollow space on the rotation axis X of the rotor 4, and is coupled to rotate together with the rotor 4. For example, the rotating shaft 3 is connected to an inner peripheral surface of the rotor 4 by, for example, a spline connection. The generator 2 generates electricity when the rotating shaft 3 rotates and the rotor 4 rotates.

[0012] 2 is a perspective view of a stator structure 1A in a generator 2. The stator structure 1A includes an annular stator core 5 formed by laminating magnetic bodies. The stator core 5 includes a plurality of split cores 6 arranged in a circumferential direction D2. The stator core 5 includes nine split cores 6, although the number of split cores is not particularly limited.

[0013] The stator structure 1A includes attachments 7 and 8 arranged on one side and the other side in the axial direction D1. At least one attachment may be arranged on one side and the other side in the axial direction D1. The attachments 7 and 8 are end plates arranged on the axial end faces of the split core 6. The stator structure 1A also includes a coil 9 wound around the split core 6, the attachments 7, and the attachments 8.

[0014] Fig. 3 is a perspective view of the first divided core 6A, the attachment 7, the attachment 8, and the coil 9. In Fig. 3, the second divided core 6B adjacent to the first divided core 6A in the circumferential direction D2 is indicated by a two-dot chain line.

[0015] 3, the first split core 6A and the second split core 6B of the stator core 5 have an arc portion 10 extending in the circumferential direction, and teeth 11 extending radially from the arc portion 10 and around which coils 9 are wound. A groove 13 is provided on one end face 12 of the arc portion 10 in the circumferential direction D2. A protrusion 15 is provided on the other end face 14 of the arc portion 10 in the circumferential direction D2. When the stator structure 1A is assembled, the protrusion 15 of the first split core 6A fits into the groove 13 of the second split core 6B adjacent to it in the circumferential direction D2.

[0016] The first split core 6A and the second split core 6B have inner plate portions 20 having a plate shape extending in both directions in the circumferential direction D2 from the tooth portion 11 at their radially inner ends of the tooth portion 11. Because the first split core 6A and the second split core 6B have inner plate portions 20 having a plate shape extending in both directions in the circumferential direction D2 from the tooth portion 11 at their radially inner ends, a larger current can be generated in the generator 2 in response to a change in the magnetic field caused by the rotation of the rotor 4, and the power generation efficiency of the generator 2 can be improved.

[0017] Attachments 7 and 8 have a base portion 16 superimposed on the axial end face of the tooth portion 11 of the first split core 6A, and a stopper portion 18 superimposed on the axial end face 17 of the arc portion 10 of the first split core 6A and the axial end face 17 of the arc portion 10 of the second split core 6B.

[0018] The attachments 7 and 8 have a stopper portion 18 extending from the base portion 16 in one direction in the circumferential direction D2, and are formed in an L-shape. The L-shape does not have to be strictly an L-shape. The attachments 7 and 8 are attached corresponding to the multiple split cores 6. The multiple attachments 7 and 8 have the same shape, but may have multiple types of shapes.

[0019] The attachments 7 and 8 are made of an insulator. When the stator structure 1A is employed in the generator 2 of a gas turbine engine and used in a high-temperature environment, it is desirable that the attachments 7 and 8 are made of, for example, heat-resistant polyimide. Note that, in the present embodiment, a form in which the attachments 7 and 8 are made of an insulator is described, but this is not limited to the above embodiment. The attachments 7 and 8 may have their surfaces subjected to an insulating treatment.

[0020] Fig. 4 is a cross-sectional view taken along a plane perpendicular to the tooth portion 11 in the portion of the first split core 6A of the stator structure 1A around which the coil 9 is wound. Fig. 4 is a cross-sectional view taken at a radially intermediate position of the tooth portion 11 of the first split core 6A around which the coil 9 is wound. An attachment 7 is attached to one axial end face of the tooth portion 11 of the first split core 6A, and an attachment 8 is attached to the other axial end face of the tooth portion 11 of the first split core 6A. The coil 9 is wound around the outer circumference of the attachment 7, the attachment 8 and the tooth portion 11.

[0021] The end of the portion of the base 16 of the attachment 7 and the attachment 8 around which the coil 9 is wound is curved. Therefore, in the attachment 7 and the attachment 8, the corner of one end in the axial direction D1 that contacts the coil 9 is configured to have a curvature radius R1. Note that the curvature radius of the curved portion of the attachment 7 and the attachment 8 may be different between the attachment 7 and the attachment 8. Since the attachment 7 and the attachment 8 have a curved shape, the load applied to the coil 9 is alleviated when the coil 9 is wound around the tooth portion 11 of the first split core 6A, the attachment 7, and the attachment 8. The end of the portion of the attachment 7 and the attachment 8 around which the coil 9 is wound is not limited to a curved shape, and may be, for example, a notched shape.

[0022] As shown in FIG. 3, the first split core 6A includes a plurality of magnetic plates 19 stacked in the axial direction D1. The first split core 6A is formed by stacking a plurality of magnetic plates 19 in the axial direction. The laminate of the magnetic plates 19 is covered with a sheet-like insulator in a portion corresponding to the teeth 11 of the split core 6A. The sheet-like insulator is, for example, a sheet made of resin. In addition, an attachment 7 is attached to one side of the split core 6A in the axial direction D1, and an attachment 8 is attached to the other side of the split core 6A in the axial direction D1. The attachment 7 and the attachment 8 are bonded together, for example, by an adhesive.

[0023] The coil 9 is wound around the attachment 7, the attachment 8, and the teeth 11 of the split core 6A. The coil 9 positions the attachment 7 and the attachment 8 relative to the magnetic plates 19 while fixing the magnetic plates 19. In other words, the coil 9 can position the attachment 7 and the attachment 8 relative to the first split core 6A. This makes it possible to suppress misalignment in the axial direction D1 between the first split core 6A and the second split core 6B, which are adjacent to each other in the circumferential direction D2.

[0024] The attachment 7 and the attachment 8 include a stopper portion 18. The stopper portion 18 is overlapped with both the axial end face 17 of the arc portion 10 of the first split core 6A and the axial end face 17 of the arc portion 10 of the second split core 6B, and is positioned with respect to the first split core 6A by the coil 9. Therefore, the stopper portion 18 can suppress misalignment of the first split core 6A and the second split core 6B in the axial direction D1.

[0025] In the first split core 6A and the second split core 6B, the other end face 12 of the arc portion 10 of the first split core 6A in the circumferential direction D2 abuts against one end face 14 of the arc portion 10 of the second split core 6B in the circumferential direction D2. As described above, the end face 14 of the arc portion 10 of the first split core 6A may include a protrusion 15, and the end face 12 of the arc portion 10 of the second split core 6B may include a groove 13. In addition, the inner plate portion 21 of the inner plate portion 20 of the split core 6A extending from the tooth portion 11 in one direction in the circumferential direction D2 abuts against the inner plate portion 22 of the inner plate portion 20 of the split core 6B extending from the tooth portion 11 in the other direction in the circumferential direction D2. Therefore, when the stator structure 1A is assembled, the adjacent first split core 6A and second split core 6B abut against each other in the circumferential direction D2.

[0026] According to this embodiment, the stopper portions 18 of the attachments 7 and 8 are overlapped on both the axial end face 17 of the arc portion 10 of the first split core 6A and the axial end face 17 of the arc portion 10 of the second split core 6B, so that the stopper portions 18 can suppress misalignment of the first split core 6A and the second split core 6B in the axial direction D1.

[0027] According to this embodiment, the ends of the portions around which the coil 9 is wound at the bases 16 of the attachments 7 and 8 are curved or tapered, thereby reducing the load on the coil 9 and preventing breakage of the coil 9, etc.

[0028] According to this embodiment, the attachments 7 and 8 are end plates arranged on the axial end faces of the split core 6, so that the configuration of the attachments 7 and 8 is simplified and the manufacturing costs of the stator structure 1A can be kept low.

[0029] According to this embodiment, the attachments 7 have the same shape, which makes manufacturing easier and allows the manufacturing cost of the stator structure 1A to be kept low.

[0030] According to this embodiment, a groove 13 is provided on the circumferential end face 12 of the second split core 6B, and a protrusion 15 is provided on the circumferential end face 14 of the arc portion 10 of the first split core 6A, and by fitting the protrusion 15 into the groove 13, radial positional deviation between the first split core 6A and the second split core 6B can be suppressed.

[0031] In the above embodiment, the configuration in which the attachment 7 and the attachment 8 are formed in an L-shape has been described, but the present invention is not limited to the above embodiment. The number and shape of the attachments 7 and the attachments 8 are not particularly limited. The attachments 7 and the attachments 8 may be attached to all adjacent split cores, or to some of the split cores. The attachments may have any shape as long as they are disposed on the axial end faces of at least two split cores adjacent in the circumferential direction, thereby allowing the multiple split cores to be positioned in the axial direction. The attachment 7 may be formed, for example, in a T-shape. The shapes of the multiple attachments 7 and the attachments 8 do not all need to be the same, and only a specific attachment may have a different shape.

[0032] Second embodiment Next, a generator stator structure 1B according to the second embodiment will be described. Note that a description of parts common to the first embodiment will be omitted. In the second embodiment, a plurality of magnetic plates stacked in the axial direction are covered with an insulating holder attached to the plurality of magnetic plates from the outside in the circumferential direction.

[0033] 5 is a perspective view of the first split core 6A and the holding body 23 before being attached to the first split core 6A. The holding body 23 is a pair of halves, a first holding body 24 and a second holding body 25, which can be divided into two in the circumferential direction D2. The holding body 23 may be configured to be divisible into two or more parts. In the generator stator structure 1B, the holding body 23 is attached to the first split core 6A from both sides in the circumferential direction.

[0034] In the holder 23, both the first holder 24 and the second holder 25 are made of an insulator. The first holder 24 and the second holder 25 are made of, for example, polyimide. In the present embodiment, the first holder 24 and the second holder 25 are made of an insulator, but are not limited to the above embodiment. The first holder 24 and the second holder 25 may have their surfaces subjected to an insulating treatment.

[0035] Fig. 6 is a perspective view of the first split core 6A in a state in which the first holding body 24 and the second holding body 25 are attached to the first split core 6A and the attachment 7 and the attachment 8 are about to be attached. As shown in Fig. 6, the first holding body 24 has a tooth abutment portion 26 that abuts against the tooth portion 11 of the first split core 6A, an arc abutment portion 27 that abuts against a radially inner surface of the arc portion 10 of the first split core 6A, a plate-shaped inner protrusion portion 56 that protrudes from the tooth abutment portion 26 radially inward toward the outside in the axial direction D1 and the outside in the circumferential direction D2, and an outer protrusion portion 57 that protrudes from the tooth abutment portion 26 radially outward from the tooth abutment portion 26.

[0036] The second retaining body 25 has a tooth abutment portion 28 that abuts against the tooth portion 11 of the first split core 6A, an arc abutment portion 29 that abuts against the radially inner surface of the arc portion 10 of the first split core 6A, a plate-shaped inner protrusion portion 58 that protrudes radially inward from the tooth abutment portion 28 toward the outside in the axial direction D1 and the circumferential direction D2, and an outer protrusion portion 59 that protrudes radially outward from the tooth abutment portion 28 toward the outside in the circumferential direction D2.

[0037] Fig. 7 shows a perspective view of the holder 23 and the first split core 6A on which the attachment 7 and the attachment 8 are attached and the coil 9 is wound. In Fig. 7, the second split core 6B adjacent to the first split core 6A in the circumferential direction is indicated by a two-dot chain line.

[0038] As shown in Fig. 7, the holder 23 is attached to both circumferential sides of the first split core 6A. An attachment 7 is attached to one axial end face of the holder 23, and an attachment 8 is attached to the other axial end face of the holder 23. A stopper portion 18 of the attachment 7 is provided on the holder 23 so as to overlap both the axial end face of the first split core 6A and the axial end face of the second split core 6B. Similarly, a stopper portion of the attachment 8 is provided on the holder 23 so as to overlap both the axial end face of the first split core 6A and the axial end face of the second split core 6B.

[0039] 6, the attachment 7 is attached to the holder 23 such that the base 16 of the attachment 7 abuts against a portion of the holder 23 that holds the teeth 11 of the first split core 6A. Similarly, the attachment 8 is attached to the holder 23 such that the base 16 of the attachment 7 abuts against a portion of the holder 23 that holds the teeth 11 of the first split core 6A. Note that the attachment 7 and the attachment 8 are attached using, for example, an adhesive, but are not limited to this.

[0040] 7, the coil 9 is wound around the attachment 7, the attachment 8, and the teeth 11 of the split core 6A. The coil 9 positions the attachment 7 and the attachment 8 relative to the holder 23 while fixing the holder 23 attached to a plurality of magnetic plates 19. In other words, the coil 9 can position the holder 23, the attachment 7, and the attachment 8 relative to the first split core 6A. This makes it possible to suppress misalignment in the axial direction D1 between the first split core 6A and the second split core 6B, which are adjacent to each other in the circumferential direction D2.

[0041] According to this embodiment, the holder 23 holds the multiple magnetic plates 19 stacked in the axial direction D1 in the circumferential and axial directions by the first holder 24 and the second holder 25. Furthermore, the multiple magnetic plates 19 are held in the radial direction D3 by the arc portion abutment portion 27 of the first holder 24 and the arc portion abutment portion 29 of the second holder 25. Thus, the multiple magnetic plates 19 stacked in the axial direction D1 are stably held by the holder 23.

[0042] According to this embodiment, an inner protrusion 56 and an outer protrusion 57 are provided on the first holding body 24, and an inner protrusion 58 and an outer protrusion 59 are provided on the second holding body 25, and the outer peripheral surface of the tooth abutment portion 26 and the outer peripheral surface of the tooth abutment portion 28 serve as guides when winding the coil 9 around the first split core 6A, making it possible to easily wind the coil 9 around the first split core 6A.

[0043] Third embodiment Next, a stator structure of a generator according to a third embodiment will be described. Note that a description of parts common to the first and second embodiments will be omitted. In the third embodiment, the attachment is attached to a holder composed of a pair of halves.

[0044] Fig. 8 is a perspective view of the holding body 30 composed of a pair of halves. The first half body 31 includes a first side plate portion 33 overlapping the tooth portion 11 of the first split core 6A (Fig. 9) from one side in the circumferential direction D2 and extending in the axial direction D1, a first end plate portion 34 connected to one end of the first side plate portion 33 in the axial direction D1 and overlapping the axial end face of the first split core 6A on one side in the axial direction D1, and a second end plate portion 35 connected to the other end of the first side plate portion 33 in the axial direction D1 and overlapping the axial end face of the first split core 6A on the other side in the axial direction D1. The second half 32 also includes a second side plate portion 36 that overlaps the tooth portion 11 of the first split core 6A (Figure 9) from the other side in the circumferential direction D2 and extends in the axial direction D1, a first end plate portion 37 that is connected to one end of the second side plate portion 36 in the axial direction D1 and overlaps the axial end face of the first split core 6A on one side in the axial direction D1, and a second end plate portion 38 that is connected to the other end of the second side plate portion 36 in the axial direction D1 and overlaps the axial end face of the first split core 6A on the other side in the axial direction D1.

[0045] 8, the first half 31 has a first end plate portion 34 and a second end plate portion 35 extending in the circumferential direction and abutting both the first split core 6A and the second split core 6B adjacent to the second split core 6A, and is provided with stopper portions 54 and 55 for axially positioning the first split core 6A and the second split core 6B. Also, in the first half 31, the first end plate portion 34 and the second end plate portion 35 are provided with portions 34a, 35a that abut the axial end face of the tooth portion 11 of the first split core 6A, and portions 34b, 35b that abut the axial end face of the inner plate portion 22.

[0046] 8, in the second half 32, the first end plate portion 37 and the second end plate portion 38 are provided with portions 37a, 38a that abut against the axial end faces of the teeth portion 11 of the first split core 6A, and portions 37b, 38b that abut against the axial end face of the inner plate portion 22. In the second half 32, the first end plate portion 37 and the second end plate portion 38 do not extend in the circumferential direction, and no stopper portion is provided that abuts against both the first split core 6A and the second split core 6B adjacent to the first split core 6A.

[0047] Fig. 9 is a perspective view of the holding body 30 and the first divided core 6A. In Fig. 9, the second divided core 6B adjacent to the first divided core 6A in the circumferential direction is indicated by a two-dot chain line.

[0048] 9, the first end plate portion 34 of the first half 31 overlaps both an axial end face 39 on one side of the first split core 6A and an axial end face 40 on one side of the second split core 6B adjacent to the first split core 6A. In addition, the second end plate portion 35 (FIG. 8) of the first half 31 overlaps both an axial end face on the other side of the first split core 6A and an axial end face on the other side of the second split core 6B adjacent to the first split core 6A.

[0049] 8 and 9, the attachment 7 is attached to a holding body 30 composed of a pair of halves, and prevents the adjacent first and second split cores 6A, 6B from being misaligned in the axial direction. At the same time, the holding body 30 holds the first split core 6A from both sides in the circumferential direction. When the first split core 6A is sandwiched between the first and second halves 31, 32 and the holding body 30 is attached to the first split core 6A, the coil 9 is wound around the teeth 11 of the first split core 6A from above the first and second halves 31, 32.

[0050] The first half 31 and the second half 32 of the holder 30 are both made of an insulator. The first half 31 and the second half 32 are made of, for example, polyimide. In the present embodiment, the first half 31 and the second half 32 are made of an insulator, but the present invention is not limited to the above embodiment. The first half 31 and the second half 32 may have their surfaces subjected to an insulating treatment.

[0051] According to this embodiment, the holder 30 holds the first divided core 6A, in which the multiple magnetic plates 19 are stacked, in the circumferential direction D2, so that the first divided core 6A can be stably held.

[0052] According to this embodiment, the holding body 30 to which the attachment 7 is attached can also serve as an insulator interposed between the coil 9 and the first split core 6A, thereby simplifying the configuration of the generator using a stator structure.

[0053] According to this embodiment, the holder 30 includes the first half 31 and the second half 32, the first half 31 includes the first side plate 33, the first end plate 34, and the second end plate 35, and the second half 32 includes the first side plate 36, the first end plate 37, and the second end plate 38, so that the first split core 6A can be held simply by attaching the first half 31 and the second half 32 to the first split core 6A. Therefore, the pair of halves 30 that sandwich the first split core 6A in the circumferential direction can be made to have a simple configuration.

[0054] According to this embodiment, the first half 31 of the holder 30 includes the first end plate 34 and the second end plate 35, and the first end plate 34 and the second end plate 35 have the stopper portions 54 and 55 extending in the circumferential direction at the portions corresponding to the arc portions 10 of the first split core 6A, so that the stopper portions 54 and 55 abut against both the first split core 6A and the second split core 6B adjacent to the first split core 6A, and position the first split core 6A and the second split core 6B adjacent to the first split core 6A in the axial direction D1. Therefore, it is possible to prevent the first split core 6A and the second split core 6B adjacent to the first split core 6A in the circumferential direction D2 from being misaligned in the axial direction D1.

[0055] (Fourth embodiment) Next, a stator structure of a generator according to a fourth embodiment will be described. Note that a description of parts configured similarly to the first to third embodiments will be omitted. In the fourth embodiment, as in the third embodiment, the attachment is attached to a holder configured of a pair of halves.

[0056] Fig. 10 is a perspective view of the holding body 41 composed of a pair of halves. As shown in Fig. 10, the first half 42 of the holding body 41 includes a first side plate portion 44 overlapping the tooth portion 11 of the first split core 6A from one side in the circumferential direction D2 and extending in the axial direction D1, a first end plate portion 45 connected to one end of the first side plate portion 44 in the axial direction D1 and overlapping the axial end face of the first split core 6A on one side in the axial direction D1, and a second end plate portion 46 connected to the other end of the first side plate portion 44 in the axial direction D1 and overlapping the axial end face of the first split core 6A on the other side in the axial direction D1. In addition, the second half 43 of the retaining body 41 includes a second side plate portion 47 that overlaps the tooth portion 11 of the first split core 6A from the other side in the circumferential direction D2 and extends in the axial direction D1, a first end plate portion 48 connected to one end of the second side plate portion 47 in the axial direction D1 and overlaps the axial end face of the first split core 6A on one side in the axial direction D1, and a second end plate portion 49 connected to the other end of the second side plate portion 47 in the axial direction D1 and overlaps the axial end face of the first split core 6A on the other side in the axial direction D1.

[0057] The first end plate portion 45 of the first half 42 overlaps both an axial end face 50 on one side of the first split core 6A and an axial end face 51 on one side of the second split core 6B adjacent to the first split core 6A (FIG. 11). The second end plate portion 46 of the first half 42 overlaps the tooth portion 11 of the first split core 6A but does not overlap the axial end face on the other side of the second split core 6B adjacent to the first split core 6A. In the first half 42, the first end plate portion 45 extends in the circumferential direction at a portion corresponding to the arc portion 10 of the first split core 6A and has a stopper portion 52 for axially positioning the first split core 6A and the second split core 6B, while the second end plate portion 46 does not have a stopper portion for axially positioning the first split core 6A and the second split core 6B. In addition, in the first half 42, the first end plate portion 45 and the second end plate portion 46 have portions 45a, 46a that abut the axial end faces of the tooth portion 11 of the first split core 6A, and portions 45b, 46b that abut the axial end faces of the inner plate portions.

[0058] The first end plate portion 48 of the second half 43 overlaps with the teeth 11 of the first split core 6A, but does not overlap with one axial end face of the third split core 6C adjacent to the first split core 6A. The second end plate portion 49 of the second half 43 overlaps with both the other axial end face of the first split core 6A and the other axial end face of the third split core 6C adjacent to the first split core 6A. In the second half 43, the first end plate portion 48 of the second half 43 does not have a stopper portion for axially positioning the first split core 6A and the third split core 6C adjacent to the first split core 6A, and the second end plate portion 49 of the second half 43 extends in the circumferential direction at a portion corresponding to the arc portion 10 of the first split core 6A and has a stopper portion 53 for axially positioning the first split core 6A and the third split core 6C adjacent to the first split core 6A. In addition, in the second half 43, the first end plate portion 48 and the second end plate portion 49 are provided with portions 48a, 49a that abut the axial end surface of the tooth portion 11 of the first split core 6A, and portions 48b, 49b that abut the axial end surface of the inner plate portion.

[0059] Fig. 11 is a perspective view of a first divided core 6A sandwiched between a pair of halves in a stator 1D of a generator according to a fourth embodiment. In Fig. 11, a second divided core 6B adjacent to one side of the first divided core 6A in the circumferential direction D2 and a third divided core 6C adjacent to the other side of the first divided core 6A in the circumferential direction D2 are indicated by two-dot chain lines.

[0060] 11, of the holder 41, the first end plate portion 45 of the first half 42 determines the positioning of the first split core 6A and the second split core 6B adjacent to the first split core 6A in the axial direction D1, while the second end plate portion 46 of the first half does not determine the positioning of the first split core 6A and the second split core 6B in the axial direction D1. In addition, the first end plate portion 48 of the second half 43 does not determine the positioning of the first split core 6A and the third split core 6C in the axial direction D1, while the second end plate portion 49 of the second half 43 determines the positioning of the first split core 6A and the third split core 6C in the axial direction D1.

[0061] 10 and 11, a stator 1D of a generator according to the fourth embodiment includes an attachment 7 attached to a holder 41. The holder 41 includes a first half 42 and a second half 43. The first half 42 and the second half 43 sandwich the first split core 6A in the circumferential direction, thereby attaching the holder 41 to the first split core 6A.

[0062] In the holder 41, both the first half 42 and the second half 43 are made of an insulator. The first half 42 and the second half 43 are made of, for example, polyimide. In the present embodiment, the first half 42 and the second half 43 are made of an insulator, but the present invention is not limited to the above embodiment. The first half 42 and the second half 43 may have their surfaces subjected to an insulating treatment.

[0063] According to this embodiment, the first half 42 and the second half 43 can be made to have the same shape, and therefore the shape of the halves can be made the same throughout the stator 1D. This allows the manufacturing cost of the stator 1D to be reduced, and the manufacturing cost of the generator 2 to be reduced.

[0064] In the technology disclosed herein, it is assumed that the stator will be used in a high-temperature environment, and therefore a form in which components such as the attachment, the holder, and the pair of halves are made of heat-resistant polyimide has been described, but if the stator is not exposed to a high-temperature environment, the attachment, the holder, and the pair of halves do not require heat resistance. In such a case, the attachment, the holder, and the pair of halves may be made of a material that does not have heat resistance.

[0065] As described above, the above embodiment has been described as an example of the technology disclosed in this application. However, the technology in this disclosure is not limited to this, and can be applied to embodiments in which modifications, replacements, additions, omissions, etc. have been made as appropriate. In addition, it is also possible to combine the components described in the above embodiment to create a new embodiment. For example, a part of the configuration or method in one embodiment may be applied to another embodiment, and a part of the configuration in an embodiment can be separated from other configurations in that embodiment and arbitrarily extracted. In addition, the components described in the attached drawings and detailed description include not only components essential for solving the problem, but also components that are not essential for solving the problem in order to exemplify the technology.

[0066] Each of the following sections is a disclosure of a preferred embodiment.

[0067] [Item 1] A plurality of divided cores arranged in a circumferential direction; an attachment overlapping axial end surfaces of at least two adjacent split cores among the plurality of split cores; A stator structure of a generator comprising: a plurality of coils wound around the plurality of split cores and the attachment.

[0068] [Item 2] The split core has an arc portion extending in the circumferential direction and a tooth portion extending radially from the arc portion and around which a coil is wound, The plurality of divided cores include a first divided core and a second divided core adjacent to each other, The attachment comprises: a base portion overlapping an axial end surface of the tooth portion of the first split core; a stopper portion overlapping an axial end surface of the arc portion of the first split core and an axial end surface of the arc portion of the second split core.

[0069] [Item 3] the first divided core and the second divided core have circumferential end faces that abut against each other in the circumferential direction, one of the circumferential end surface of the first divided core and the circumferential end surface of the second divided core has a groove extending in the axial direction and open in the axial direction, the other of the circumferential end surface of the first divided core and the circumferential end surface of the second divided core has a protrusion extending in the axial direction, 3. The stator structure of a generator according to claim 2, wherein the protrusion is fitted into the groove.

[0070] [Item 4] 4. The stator structure of a generator according to item 2 or 3, wherein an end of the base of the attachment, around which the coil is wound, has a curved or tapered shape.

[0071] [Item 5] 5. The stator structure of a generator according to any one of items 1 to 4, wherein the attachment is an end plate arranged on the axial end surface of the split core.

[0072] [Item 6] a holder that holds at least one of the divided cores in the circumferential direction, 6. The stator structure of a generator according to any one of items 1 to 5, wherein the attachment is attached to the holder.

[0073] [Item 7] 7. The stator structure of a generator according to any one of items 1 to 6, wherein the attachment is an insulator.

[0074] [Item 8] 7. The stator structure of a generator according to any one of items 1 to 6, wherein the attachment has a surface that is insulated.

[0075] [Item 9] The pair of halves includes a first half and a second half, The first half is a first side plate portion overlapping the tooth portion of the divided core from one side in the circumferential direction and extending in the axial direction; a first end plate portion connected to one end of the first side plate portion in the axial direction and overlapping an axial end surface on one side of the split core in the axial direction; a second end plate portion connected to the other end of the first side plate portion in the axial direction and overlapping an axial end surface of the split core on the other side in the axial direction, The second half is a second side plate portion overlapping the tooth portion of the divided core from the other side in the circumferential direction and extending in the axial direction; a first end plate portion connected to one end of the second side plate portion in the axial direction and overlapping an axial end surface on one side of the split core in the axial direction; a second end plate portion connected to the other axial end of the second side plate portion and overlapping an axial end face of the split core on the other side in the axial direction.

[0076] [Item 10] 10. A stator structure for a generator as described in item 9, wherein the first end plate portion of the first half overlaps both an axial end face on one side of the corresponding split core and an axial end face on one side of the split core adjacent to the corresponding split core.

[0077] [Item 11] Item 11. A stator structure for a generator according to item 10, wherein the second end plate portion of the first half overlaps both the axial end face on the other side of the corresponding split core and the axial end face on the other side of the split core adjacent to the corresponding split core.

[0078] [Item 12] 10. The stator structure of a generator according to item 9, wherein the first half and the second half have the same shape as each other. [Explanation of symbols]

[0079] 1A, 1B, 1C, 1D Stator 2. Generator 5 Stator core 6, 6A, 6B, 6C split core 7, 8 Attachment 9 Coil 10 arc 11 Teeth 13 Groove 15 Protrusions 16 base 18 Stopper part 19 Magnetic plate 30 Holder 31 First half 32 Second half 33 First side plate part 34 First end plate part 35 Second end plate part 36 Second side plate part 37 First end plate part 38 Second end plate section 41 Holding body 42 First half 43 Second half 44 First side plate part 45 First end plate part 46 Second end plate part 47 Second side plate part 48 1st end plate section 49 Second end plate part 52, 53, 54, 55 Stopper part

Claims

1. A plurality of divided cores arranged in a circumferential direction; an attachment overlapping axial end surfaces of at least two adjacent split cores among the plurality of split cores; A stator structure of a generator comprising: a plurality of coils wound around the plurality of split cores and the attachment.

2. The split core has an arc portion extending in the circumferential direction and a tooth portion extending radially from the arc portion and around which a coil is wound, The plurality of split cores include a first split core and a second split core adjacent to each other, The attachment comprises: a base portion overlapping an axial end surface of the tooth portion of the first split core; 2. The stator structure of a generator according to claim 1, further comprising: a stopper portion overlapping an axial end surface of the arc portion of the first split core and an axial end surface of the arc portion of the second split core.

3. The first divided core and the second divided core have circumferential end surfaces that abut against each other in the circumferential direction, one of the circumferential end surface of the first divided core and the circumferential end surface of the second divided core has a groove extending in the axial direction and open in the axial direction, the other of the circumferential end surface of the first divided core and the circumferential end surface of the second divided core has a protrusion extending in the axial direction, The stator structure of a generator according to claim 2 , wherein the protrusion is fitted into the groove.

4. 4. The generator stator structure according to claim 2, wherein an end of the base of the attachment, around which the coil is wound, has a curved or tapered shape.

5. 3. The generator stator structure according to claim 1, wherein the attachment is an end plate disposed on an axial end surface of the split core.

6. a holder that holds at least one of the divided cores in the circumferential direction, The stator structure of a generator according to claim 1 or 2, wherein the attachment is attached to the holder.

7. The generator stator structure according to claim 1 or 2, wherein the attachment is an insulator.

8. 3. The generator stator structure according to claim 1, wherein a surface of the attachment is subjected to an insulating treatment.

9. The holder includes a first half and a second half, The first half is a first side plate portion overlapping the tooth portion of the divided core from one side in the circumferential direction and extending in the axial direction; a first end plate portion connected to one end of the first side plate portion in the axial direction and overlapping an axial end surface on one side of the split core in the axial direction; a second end plate portion connected to the other end of the first side plate portion in the axial direction and overlapping an axial end surface of the split core on the other side in the axial direction, The second half is a second side plate portion overlapping the tooth portion of the divided core from the other side in the circumferential direction and extending in the axial direction; a first end plate portion connected to one end of the second side plate portion in the axial direction and overlapping an axial end surface on one side of the split core in the axial direction; 7. The stator structure of a generator according to claim 6, further comprising: a second end plate portion connected to the other axial end of the second side plate portion and overlapping an axial end face on the other side of the split core in the axial direction.

10. 10. The stator structure of a generator as described in claim 9, wherein the first end plate portion of the first half overlaps both an axial end face on one side of the corresponding split core and an axial end face on one side of the split core adjacent to the corresponding split core.

11. 11. The stator structure of a generator as described in claim 10, wherein the second end plate portion of the first half overlaps both the axial end face on the other side of the corresponding split core and the axial end face on the other side of the split core adjacent to the corresponding split core.

12. The generator stator structure according to claim 9 , wherein the first half and the second half have the same shape as each other.

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