JP2007325398A - Slot material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent residual deformation for blocking an opening in an almost U shape in a slot material even if it is inserted into a slot, and to prevent interference when a coil is inserted into the slot in the slot material of a rotary electric machine. <P>SOLUTION: In a three-layer structure of a high elastic material layer 23 where the slot material 19 is formed with a high elastic material such as insulating synthetic rubber, a high flexible material layer 25 formed by a high flexible material such as an insulating polyethylene sheet, and an adhesive layer 27 bonding the two layers; the high elastic material layer 23 on an inner side (coil side) is made thicker than the high flexible material layer 25 on an outer side (inner face side of slot). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure of a slot member of a rotating electrical machine such as a motor, a generator, and a motor generator.

  Hybrid vehicles and electric vehicles using a rotating electrical machine as a vehicle drive device are being put into practical use. In such a rotating electric machine, as shown in FIG. 6, a coil is wound around a slot 13 provided in an annular stator core 11, and the coil is separately wound with an electric wire (magnet wire) by a winding machine. A process is used in which the formed U-phase, V-phase, and W-phase field coils are sequentially inserted using an insertion machine (inserter). When the coil winding is inserted into the slot 13, a slot member 29, which is an insulating material, is attached to the slot 13 before the coil is inserted in order to ensure insulation between the coil and the core. The The slot material 29 has a cuff portion 31 that is curved in a substantially U shape and whose upper and lower ends are bent outward, and is inserted into the slot 13 from above or below the stator core 11 and attached (for example, , See Patent Document 1).

  As shown in FIG. 7, the conventional slot member 29 is a composite sheet having a three-layer structure in which two heat-resistant sheets made of polyamide resin are joined with an adhesive to increase electrical insulation and strength, for example, A three-layer composite sheet in which a PEN layer 35 (polyethylene naphthalate) is sandwiched between two heat-resistant polyamide papers 33 (NOMEX) and adhered with an adhesive layer 37 is used. The heat-resistant polyamide paper 33 (NOMEX) is made of a heat-resistant polyamide resin fiber, so-called Kevlar fiber, and the electrical insulation is ensured by filling the gap between the fibers with the PEN (for example, see Patent Document 2).

JP 2005-73413 A JP 2004-364382 A

  The heat-resistant polyamide resin (NOMEX) used for the conventional slot material 29 as described above is a material that is excellent in strength and insulation, but does not have great elasticity. On the other hand, when the slot member 29 having the cuff portions 31 at both ends is inserted into the slot 13 as shown in FIG. 6, it is necessary to compress the substantially U-shaped slot member 29 at one end and then insert it into the slot 13. . However, after the slot material 29 is compressed and inserted into the slot 13, there is a problem that the compression deformation at the time of insertion remains. As shown in FIG. 6, this residual deformation is a deformation in which the central portion of the slot member 29 is arcuate toward the center of the slot 13 and closes the substantially U-shaped opening. When the coil is inserted into the slot 13 by the inserter after inserting the coil, there is a problem that the coil and the slot member 29 interfere with each other.

  Accordingly, an object of the present invention is to prevent a residual deformation that closes a substantially U-shaped opening of a slot member even if it is inserted into a slot, and to prevent interference when a coil is inserted into the slot.

  The slot member of the present invention is a slot member that is inserted into each slot of the stator core and separates the coil inserted between the slots from the inner surface of the slot and the end surface of the stator core, and is provided on the coil side. And an insulating material layer on the inner surface side of the slot. In addition, it is preferable that the insulating material layer of the slot material is formed of an insulating high stretchable material thinner than the high elastic material layer. The slot material may be formed by two-layer extrusion molding, or may have a three-layer structure in which the high-elastic material layer and the insulating material layer are joined by an adhesive layer.

  The present invention has the effect of preventing residual deformation that closes the substantially U-shaped opening of the slot member even if it is inserted into the slot, thereby preventing interference during insertion of the coil into the slot.

  A preferred embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view showing a state in which a slot member and a coil are inserted into a slot of a rotary electric stator core, FIG. 2 is an explanatory view showing a process of inserting the slot member into the stator core, and FIG. FIG. 4 is a cross-sectional view of an embodiment of a slot member, FIG. 4 is a perspective view showing a state of deformation of the slot member when the slot member is inserted into the slot, and FIG. 5 is a state of restoration of the slot member inserted into the slot. FIG.

  As shown in FIG. 1, a stator core 11 made of a laminated steel plate of a rotating electrical machine is formed with many slots 13 toward the inner peripheral side. A substantially U-shaped slot member 19 having cuff portions 21 at both upper and lower ends is inserted into the slot 13. The coil 17 is inserted from the U-shaped opening side of the slot member 19. The coils 17 are inserted between the slots 13, and the coils 17 between the slots 13 form a coil end 18 on the end face of the stator core 11, and the coil 17 of the coil end 18 is connected by a coil bundle wire 15. They are united. The slot member 19 is sandwiched between the inner surface of the slot 13 and the coil 17 to separate the coil 17 from the inner surface of the slot 13, and the coil 17 is separated from the end surface of the stator core by the cuff part 21 protruding from the end surface of the stator core 11. To ensure insulation.

  As shown in FIG. 2, the slot member 19 is formed into a substantially U shape, and the cuff portions 21 at both ends are bent outward. As shown in FIG. 2, the slot material 19 is inserted into the slot 13 from the end face side of the stator core 11. Since the slot member 19 has the cuff part 21, the slot member 19 is compressed so as to close the substantially U-shaped opening at the time of insertion. When the insertion is completed, the cuff part 21 protrudes from both end faces of the stator core 11 to separate the coil end 18 and the stator end face, thereby maintaining insulation.

  As shown in FIG. 3, the slot member 19 of the present embodiment is made of a highly elastic material layer 23 formed of a highly elastic material such as an insulating synthetic rubber and a highly elastic material such as an insulating polyethylene sheet. It has a three-layer structure of the formed high stretchable material layer 25 and an adhesive layer 27 that joins these two layers. The high elastic material layer 23 is on the inner side (coil side) of the slot material 19 and the high elastic material layer 25 is on the outer side (slot inner surface side). The high elastic material layer 23 is thicker than the high elastic material layer 25. Yes.

  When the slot member 19 having such a configuration is inserted into the slot 13, as shown in FIG. 4, the slot member 19 is compressed in the direction in which the substantially U-shaped opening is closed by the compressive force from the outer surface. The high elastic material layer 25 on the outer surface stretches and deforms following such deformation, and does not become a resistance to compressive deformation of the high elastic material layer 23, so that it can be easily inserted. When the slot material 19 is completely inserted into the slot 13, the inner high elastic material layer 23 is deformed in a direction to open the substantially U-shaped opening so as to return to the original shape by the elastic force. At this time, since the outer high stretchable material layer 25 is made of a high stretchable material, it does not become a resistance to the return deformation. After the slot material 19 is inserted into the slot 13 by the inner high elastic material layer 23 as described above, the opening of the slot material 19 is opened and is in close contact with the inner surface of the slot 13 so that the substantially U-shaped opening is formed. Residual deformation that closes does not occur, and interference between the coil 17 and the slot member 19 when the coil 17 is inserted can be prevented. As a result, it is possible to reduce problems during insertion of the coil 17 and to save the trouble of correcting the position of the slot member 19 before inserting the coil.

  In the above embodiment, the case where the inner high elastic material layer 23 is configured to be thicker than the outer high elastic material layer 25 has been described. However, the high elastic material layer 23 and the high elastic material layer 25 are configured. Depending on the combination of materials used, the thickness may be equal, or the high elastic material layer 23 may be thin. In the above-described embodiment, the three-layer structure in which the high elastic material layer 23 and the high elastic material layer 25 are joined by the adhesive layer 27 has been described. However, the two-layer extrusion molding is performed by combining the high elastic material and the high elastic material. If possible, a two-layer structure without an adhesive layer may be used.

It is a perspective view which shows the state by which the slot material and the coil were inserted in the slot of the stator core of rotation electricity. It is explanatory drawing which shows the process of inserting a slot material in a stator core. It is sectional drawing of embodiment of the slot material of this invention. FIG. 6 is a perspective view showing a state of deformation of the slot material when the slot material is inserted into the slot. It is a perspective view which shows the mode of restoration of the slot material inserted in the slot. It is a figure which shows the mode of the residual deformation | transformation of a slot material when the slot material of a prior art is inserted in a slot. It is sectional drawing of the slot material of a prior art.

Explanation of symbols

  11 Stator core, 13 slots, 15 coil bundle wire, 17 coils, 18 coil ends, 19, 29 slot material, 21, 31 cuff part, 23 high elastic material layer, 25 high elastic material layer, 27, 37 adhesive layer, 33 Heat-resistant polyamide paper, 35 PEN layer.

Claims (4)

A slot member inserted in each slot of the stator core and separating the coil inserted between the slots from the inner surface of the slot and the end surface of the stator core,
An insulating synthetic rubber-based highly elastic material layer on the coil side;
An insulating material layer on the inner surface side of the slot;
A slot material characterized by comprising: The slot member according to claim 1,
The insulating material layer is formed of an insulating highly stretchable material thinner than the highly elastic material layer;
Slot material characterized by. The slot member according to claim 1 or 2,
The slot material was formed by two-layer extrusion,
Slot material characterized by. The slot member according to claim 1 or 2,
The slot material has a three-layer structure in which the high-elasticity material layer and the insulating material layer are joined by an adhesive layer;
Slot material characterized by.

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