Stator

Abstract

To close a slot sheet so as to avoid an exposure of a coil provided in a slot of a stator core to an open part side of the slot.SOLUTION: A stator core having a slot, comprises: a coil that is wound to a stator core so as to be inserted into the slot; and a slot sheet that isolates between the stator core and the coil so as to be provided into the slot. The slot sheet is a stator having a construction that a foam layer is formed to both surfaces of an insulation layer in a part where it is arranged to between the stator core and the coil. The slot sheet has a construction that it is laminated via the foam layer in a state where both end parts of the insulation layer is overlapped to a part where it is not arranged to between the stator core and the coil, and a surface directed to an inner side of a radial direction faced to an open part of the slit is formed by the insulation layer.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a stator. [Background technology]

[0002] Patent Document 1 discloses that in a stator having a coil wound around a stator core, an insulating sheet is provided in a slot of the stator core to insulate the coil from the stator core. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-120528 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration described in Patent Document 1, the insulating sheet is open at the point facing the slot opening, so the coil inside the slot is exposed facing the rotor, and there is a risk of discharge occurring between the coil and the rotor through the slot opening.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a stator in which the slot paper can be closed so that the coils arranged in the slots of the stator core are not exposed on the opening side of the slot. [Means for solving the problem]

[0006] The present invention is a stator comprising a stator core having a slot, a coil inserted into the slot and wound around the stator core, and slot paper provided in the slot to provide insulation between the stator core and the coil, wherein the slot paper has a structure in which a foam layer is formed on both sides of an insulating layer in the portion positioned between the stator core and the coil, and the slot paper has a structure in which both ends of the insulating layer are overlapped and laminated via the foam layer in the portion not positioned between the stator core and the coil, and the surface facing radially inward, facing the opening of the slot, is formed by the insulating layer. [Effects of the Invention]

[0007] In the present invention, the slot paper can be closed so that the coils provided in the slots of the stator core are not exposed on the opening side of the slots. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a stator according to an embodiment. [Figure 2] FIG. 2 is a diagram for explaining slot paper. [Figure 3] 3(a) is a schematic diagram for explaining a cross section taken along line AA in FIG. 2, and FIG. 3(b) is a schematic diagram for explaining a cross section taken along line BB in FIG. [Figure 4] FIG. 4 is a diagram for explaining the state in which the slot paper is open. [Figure 5] FIG. 5 is a diagram showing a state in which the slot paper is closed by the pressing jig. [Figure 6] FIG. 6 is a diagram showing a state in which the slot paper is in contact with the pressing jig. [Figure 7] FIG. 7 is a schematic diagram for explaining a cross section taken along line CC in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] A stator according to an embodiment of the present invention will be specifically described below, but the present invention is not limited to the embodiment described below.

[0010] FIG. 1 is a diagram showing a stator according to an embodiment. The stator 1 includes a stator core 11 and a coil 12 wound around the stator core 11. The stator 1 constitutes a motor and has a cylindrical structure disposed on the outer periphery of the rotor. The stator core 11 has slots 13. The coils 12 are inserted inside the slots 13.

[0011] The stator 1 includes slot paper 20 that is provided in the slot 13 of the stator core 11 and provides insulation between the stator core 11 and the coil 12 .

[0012] The slot paper 20 is a sheet-like insulating member for electrically insulating the stator core 11 from the coil 12 inserted into the slot 13. The slot paper 20 is arranged along the inner surface of the slot 13. The slot paper 20 is located between the inner surface of the slot 13 and the coil 12, and has the function of fixing the coil 12 to the slot 13.

[0013] As shown in FIGS. 2 and 3, the slotted paper 20 includes a sheet-like insulating layer 21 and foam layers 22 laminated on both sides of the insulating layer 21.

[0014] The insulating layer 21 is a base material of the slotted paper 20 and is made of an insulating material. For example, the insulating layer 21 is made of a plastic sheet, a polyethylene terephthalate film, a polyimide film, or heat-resistant amilado paper.

[0015] The foam layer 22 is an adhesive material and is made of a resin that foams when heated. For example, the foam layer 22 is made of a thermosetting foamable resin such as an epoxy-based foamable resin. Before being heated, the foam layer 22 is made up of foam beads. The foam beads expand when heated, and then the foam layer 22 hardens. The foam layer 22 is formed by applying a resin that foams when heated to both sides of the sheet-like insulating layer 21.

[0016] The slotted paper 20 has a structure in which the foam layer 22 is partially absent. The front surface 20a of the slotted paper 20 is configured such that the side of one end 23 is formed by the foam layer 22, and the side of the other end 24 is formed by the insulating layer 21. The back surface 20b of the slotted paper 20 is formed entirely by the foam layer 22. The side of the front surface 20a on the side of the other end 24 includes the surface from which the foam layer 22 has been removed, and is the surface that faces radially inward when the slotted paper 20 is folded and inserted into the slot 13.

[0017] When the slot paper 20 is disposed inside the slot 13, the portion of the slot paper 20 that is disposed between the stator core 11 and the coil 12 has a structure in which foam layers 22 are formed on both sides of the insulating layer 21. As shown in FIG. 1, when the slot paper 20 is disposed inside the slot 13, the portion of the slot paper 20 that is not disposed between the stator core 11 and the coil 12 has a structure in which the surface facing radially inward, that is, facing the opening 14 of the slot 13, is formed by the insulating layer 21. The surface of the surface 20a on the other end 24 side is the surface on which the insulating layer 21 is exposed, and the pressing jig 30 comes into contact with this exposed insulating layer 21. Note that, for ease of explanation, the insulating layer 21 is shown by hatching in FIG. 1, but this does not represent a cross section, but rather a surface.

[0018] As shown in Figure 4, when an inspection is carried out to measure the electrical resistance of the coil 12 inserted into the slot 13, the slot paper 20 is open on the opening 14 side. When both ends 23, 24 of the slot paper 20 are open, the slot paper 20 is open radially inward. In this case, the radially inner portion of the coil 12 is exposed, and this exposed portion has an exposed conductor portion 15 for inspection. When the slot paper 20 is open, the exposed conductor portion 15 is visible from the opening 14.

[0019] The state shown in Figure 4 transitions to the state shown in Figure 5, and the slotted paper 20 is pressed down by the pressing jig 30 so as to close the open slotted paper 20. In this case, as shown in Figure 6, the pressing jig 30 is inserted into the opening 14 of the slot 13 from the radially inside, and the slotted paper 20 is pressed down radially outward by the pressing jig 30 so that both ends 23, 24 of the slotted paper 20 overlap.

[0020] As shown in Figure 6, while the slotted paper 20 is being pressed against both ends 23, 24 with a pressing jig 30, the slotted paper 20 is heated to foam the foam layer 22 and fix the coil 12 in the slot 13. At this time, as shown in Figure 7, the surface that comes into contact with the pressing jig 30 is the surface on which the insulating layer 21 is exposed, so the pressing jig 30 and the slotted paper 20 are configured not to stick to each other. Furthermore, both ends 23, 24 of the slotted paper 20 are bonded to each other by the foam layer 22, with the insulating layer 21 sandwiched between them. Note that for ease of explanation, in Figure 7, the pressing jig 30, one end 23, the other end 24, and the coil 12 are shown separated from each other, but they are actually in contact with each other.

[0021] Specifically, the foam layer 22 on the front surface 20a of one end 23 and the foam layer 22 on the back surface 20b of the other end 24 foam, and the insulating layer 21 of one end 23 and the insulating layer 21 of the other end 24 are bonded together by the foam layer 22. In addition, between the coil 12 and the slotted paper 20 in the radial direction, the foam layer 22 on the back surface 20b of one end 23 foams when heated, and the insulating layer 21 of one end 23 is bonded to the coil 12 by this foam layer 22. When the foam layer 22 foams and hardens when heated with both ends 23, 24 overlapping in this way, the slotted paper 20, which has been closed with the ends 23, 24 bonded together, will not reopen. The slotted paper 20 is closed when both ends 23, 24 of the slotted paper 20 are bonded together and to the coil 12. Within the slot 13, in the portion of the slot paper 20 that is not positioned between the stator core 11 and the coil 12, both ends of the insulating layer 21 are overlapped and laminated via the foam layer 22, and the surface facing radially inward, facing the opening 14 of the slot 13, is formed by the insulating layer 21.

[0022] As described above, according to the embodiment, the slot paper 20 can be closed so that the coils 12 provided in the slots 13 of the stator core 11 are not exposed on the opening 14 side of the slots 13. This allows the slot paper 20 to insulate the coils 12 in the slots 13 from the rotor, and prevents discharge from occurring between the exposed conductor portions 15 of the coils 12 and the rotor.

[0023] The method for forming the structure in which insulating layer 21 is exposed on surface 20a on one end 24 side is not particularly limited. For example, it may be formed by a method in which a resin that foams when heated is not applied to the insulating layer 21 in the relevant area. Alternatively, it may be formed by a method in which a resin that foams when heated is applied to the entire area on both sides of insulating layer 21, and then the relevant area is rolled to break the foam beads. Alternatively, it may be formed by a method in which a resin that foams when heated is applied to the entire area on both sides of insulating layer 21, and then a non-adhesive seal (single-sided seal) is attached to one side of the relevant area. [Explanation of symbols]

[0024] 1 stator 11 Stator core 12 coils 13 slots 14 Openings 15 Exposed conductor 20 slot paper 21 Insulating layer 22 Foam layer 23,24 End 30 Presser jig

Claims

[Claim 1] a stator core having slots; A coil is inserted into the slot and wound around the stator core; a slot paper provided in the slot to insulate the stator core and the coil; Equipped with The slot paper is a stator having a structure in which foam layers are formed on both sides of an insulating layer in a portion disposed between the stator core and the coil, The slot paper has a structure in which, in a portion not disposed between the stator core and the coil, both ends of the insulating layer are laminated via the foam layer in a state of overlapping, and a surface facing the radially inward direction and facing the opening of the slot is formed by the insulating layer. A stator comprising:

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