Rotary electric machine

Abstract

To obtain a rotary electric machine in which a fixed state between a fixing member and a stator winding is easily maintained for a long period of time.SOLUTION: The rotary electric machine includes a stator and a rotor. The stator includes a stator core, a stator winding, a fixing member, a pulp member, a first resin part, and a second resin part. The stator core has an inner peripheral surface and is provided with slots provided on the inner peripheral surface. The stator winding is received in the slots. The fixing member is located on the rotor side with respect to the stator winding in the slot and is fixed to the stator core. The pulp member includes pulp and is provided between the stator winding and the fixing member. The first resin portion contains a resin, is interposed between the fixing member and the pulp member, and fixes the fixing member and the pulp member to each other. The second resin portion contains a resin, is interposed between the stator winding and the pulp member, and fixes the stator winding and the pulp member to each other.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a rotating electric machine. [Background technology]

[0002] A conventional stator for a rotating electric machine includes a stator core with slots, a stator winding inserted in the slots, a fixed member located on the rotor side of the stator winding and fixed to the stator core, and a filler member provided between the stator winding and the fixed member. The filler member is made of a glass cloth laminate. In this configuration, the fixed member and the fixed winding are fixed to each other via the filler member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-158316 Summary of the Invention [Problem to be solved by the invention]

[0004] In this type of rotating electrical machine, it is beneficial if the fixed state between the fixed member and the stator winding can be maintained for a long period of time.

[0005] An object of the present invention is to provide a rotating electric machine in which the fixed state between the fixed member and the stator winding is likely to be maintained for a long period of time. [Means for solving the problem]

[0006] A rotating electric machine according to an embodiment of the present invention comprises a stator and a rotor rotatable relative to the stator, the stator having an inner circumferential surface surrounding the rotor and a stator core with concave slots formed on the inner circumferential surface, a stator winding inserted in the slot, a fixing member located on the rotor side of the stator winding within the slot and fixed to the stator core, a pulp member containing pulp and provided between the stator winding and the fixing member, a first resin part containing resin, interposed between the fixing member and the pulp member and fixing the fixing member to the pulp member, and a second resin part containing resin, interposed between the stator winding and the pulp member and fixing the stator winding to the pulp member. [Effects of the Invention]

[0007] According to the rotating electric machine of the embodiment of the present invention, it is possible to obtain a rotating electric machine in which the fixed member and the stator winding are likely to be fixed to each other for a long period of time. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing the configuration of a rotating electric machine according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing a part of the stator of the rotating electric machine according to the embodiment. [Figure 3] FIG. 3 is a cross-sectional view showing a portion including a pulp member in a stator according to the embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing a part of the pulp member according to the embodiment. [Figure 5] FIG. 5 is a perspective view showing the configuration of the insulated coil according to the embodiment. [Figure 6] FIG. 6 is a cross-sectional view showing the configuration of an insulated coil according to an embodiment. [Figure 7] FIG. 7 is a cross-sectional view schematically showing the configuration of an insulating tape according to an embodiment. [Figure 8] FIG. 8 is a cross-sectional view that schematically shows the internal structure of the main insulating part according to the embodiment. [Figure 9]FIG. 9 is a cross-sectional view of a main insulating portion, which schematically illustrates the effect of the mica particles according to the embodiment. [Figure 10] FIG. 10 is a cross-sectional view of an insulating tape, which schematically illustrates the effect of silica particles according to the embodiment. [Figure 11] FIG. 11 is a flowchart showing the steps of a method for manufacturing an insulating structure for an insulated coil according to an embodiment. [Figure 12] FIG. 12 is a diagram showing the state of an impregnation device used in a manufacturing method of an insulating structure according to an embodiment in the first half of the process. [Figure 13] FIG. 13 is a diagram showing the state of an impregnation device used in a manufacturing method of an insulating structure according to an embodiment in a latter stage. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification, components according to the embodiments and descriptions of the components may be described using multiple expressions. The components and their descriptions are merely examples and are not limited by the expressions in this specification. The components may also be identified by names different from those in this specification. Furthermore, the components may also be described using expressions different from those in this specification.

[0010] <Configuration of rotating electric machine>

[0011] FIG. 1 is a cross-sectional view showing the configuration of a rotating electrical machine 1 according to an embodiment.

[0012] The rotating electric machine 1 has a rotor 10 and a stator 20. The rotor 10 is rotatable relative to the stator 20. The rotating electric machine 1 is a component of, for example, an electric motor, a generator, or the like.

[0013] The rotor 10 has a rotor shaft 11 and a rotor core 12. The rotor shaft 11 is rotatably supported near both ends by bearings 5. The bearings 5 ​​are fixed to bearing brackets 7 that are integral with a frame 6 that forms the outer shell of the rotating electric machine 1. The rotor core 12 is fixed to the outer surface of the rotor shaft 11 and rotates together with the rotor shaft 11. The rotor 10 is rotatable around a central axis of rotation. The central axis of rotation is the center of rotation of the rotor 10 (rotor shaft 11) and is an imaginary line that passes through the center of the rotor 10 (rotor shaft 11). Hereinafter, unless otherwise specified, the axial, radial, and circumferential directions refer to the axial, radial, and circumferential directions of the rotor 10 (rotor shaft 11), i.e., the axial, radial, and circumferential directions of the central axis of rotation.

[0014] <Configuration of stator>

[0015] Fig. 2 is a cross-sectional view showing a part of the stator 20 of the rotating electric machine 1 according to the embodiment. Fig. 3 is a cross-sectional view showing a part including the pulp member 24 in the stator 20 according to the embodiment. Fig. 4 is a cross-sectional view showing a part of the pulp member 24 according to the embodiment.

[0016] 1 to 3, stator 20 has stator core 21, insulated coil 22, fixing member 23, multiple pulp members 24A, 24B, and 24C, and resin part 25 (FIG. 3). Stator 20 is formed in a cylindrical shape surrounding rotor core 12, which is a part of rotor 10. Hereinafter, pulp member 24 will be used as a general term for the multiple pulp members 24A, 24B, and 24C.

[0017] 1, stator core 21 is formed in a cylindrical shape surrounding rotor core 12. Stator core 21 is disposed radially outward from rotor core 12 with a gap therebetween. Stator core 21 has an inner circumferential surface 21a. Inner circumferential surface 21a is disposed radially outward from rotor core 12 with a gap therebetween, and surrounds rotor 10.

[0018] As shown in FIG. 2, concave slots 21b are provided in the inner circumferential surface 21a. A plurality of slots 21b are provided. The plurality of slots 21b are provided at intervals in the circumferential direction. Note that only one slot 21b is shown in FIG. 2. The slot 21b opens radially inward from the inner circumferential surface 21a and is concave radially outward. The slot 21b penetrates the stator core 21 in the axial direction. The slot 21b is also provided with a pair of grooves 21c. The pair of grooves 21c are formed in a concave shape so as to be spaced apart from each other in the circumferential direction.

[0019] The insulated coil 22 shown in FIGS. 1 and 2 is a component incorporated into the stator core 21 to generate a magnetic field essential for the rotating electric machine 1, and an insulating structure (described later) is provided on its outer periphery. As shown in FIG. 2, the insulated coil 22 is inserted into the slot 21b and fixed to the stator core 21 by a fixing member 23, a pulp member 24, and a resin portion 25 (FIG. 3). As an example, the insulated coil 22 is arranged in the slot 21b in a two-layer lap winding structure. That is, the insulated coil 22 has two layers 22a and 22b that are overlapped with each other. Note that the insulated coil 22 is not limited to the above. The insulated coil 22 is an example of a stator winding.

[0020] As shown in FIG. 2, a fixing member 23 is provided for each slot 21b. The fixing member 23 is located within the slot 21b on the rotor 10 side with respect to the insulated coil 22, and is fixed to the stator core 21. The fixing member 23 extends in the axial direction and covers the insulated coil 22. The fixing member 23 limits the movement of the insulated coil 22 radially outward. The fixing member 23 is made of a material such as, but not limited to, a magnetic material or a glass material. The fixing member 23 is also called a wedge.

[0021] 2, the pulp members 24A to 24C are provided in the slots 21b. The pulp member 24A is provided between the radially inner layer 22a of the insulated coil 22 and the fixing member 23. The pulp member 24B is provided between the two layers 22a and 22b of the insulated coil 22. The pulp member 24C is provided between the radially outer layer 22b of the insulated coil 22 and the stator core 21.

[0022] As shown in FIG. 3, the pulp member 24 contains pulp and is formed into a plate shape. The pulp member has insulating properties. The pulp member 24 is made of, for example, a molded pulp plate. The molded pulp plate is made by solidifying multiple pieces of pulp into a plate shape. The molded pulp plate is mainly composed of pulp. The molded pulp plate may be made of pulp alone, or may contain other materials such as a binder in addition to pulp. The pulp of the pulp member can be made of various known plant fibers. For example, fibers of softwood or hardwood are used as the pulp. Preferably, softwood fibers are used as the pulp. The diameter of a single pulp (fiber) is, for example, 50 μm to 100 μm. Softwood fibers are denser and thinner than hardwood fibers, for example, and therefore the strength of the pulp member 24 can be easily increased. The pulp member 24 is also called an insulating member or a spacer.

[0023] The pulp member 24 has one surface 24a located on the inside in the radial direction and another surface 24b located on the outside in the radial direction. The one surface 24a and the other surface 24b each have an uneven portion 24d. The uneven portion 24d includes a convex portion 24e and a concave portion 24f. The uneven portion 24d is formed when the pulp member 24, i.e., the molded pulp plate, is molded. Because the molded pulp plate is primarily composed of pulp, the size of the uneven portion 24d (the height of the convex portion 24e and the depth of the concave portion 24f) is relatively large. As shown in FIG. 4, the pulp member 24 has a porous structure. That is, a plurality of holes 24c are formed inside the pulp member 24. At least some of the plurality of holes 24c communicate with each other to form a void portion 24g. The void portion 24g is shown schematically. The void portion 24g is connected to the one surface 24a and the other surface 24b.

[0024] As shown in Fig. 3, the resin portion 25 is provided for each pulp member 24. Note that the resin portion 25 is not shown in Fig. 2. The resin portion 3 provided for the pulp member 24A will be described in detail below.

[0025] As shown in Fig. 3, the resin portion 25 has a first resin portion 25a, a second resin portion 25b, and a third resin portion 25c. The first resin portion 25a, the second resin portion 25b, and the third resin portion 25c are integrated together. The resin portion 25 has insulating properties. The resin portion 25 (the first resin portion 25a, the second resin portion 25b, and the third resin portion 25c) contains a resin. The resin of the resin portion 25 will be described in detail later.

[0026] The first resin portion 25a is interposed between the fixing member 23 and one surface 24a of the pulp member 24A, and fixes (secures) the fixing member 23 and the pulp member 24A. The first resin portion 25a is configured in a shape that follows the uneven portion 24d of the one surface 24a of the pulp member 24, and is in contact with the uneven portion 24d. In other words, the first resin portion 25a is placed in the recess 24f.

[0027] The second resin portion 25b is interposed between the insulating coil 22 and the other surface 24b of the pulp member 24A, and fixes the insulating coil 22 to the pulp member 24A. The second resin portion 25b is configured in a shape that follows the uneven portion 24d on the other surface 24ba of the pulp member 24, and is in contact with the uneven portion 24d. In other words, the second resin portion 25b is placed in the recess 24f.

[0028] The third resin portion 25c is provided inside the pulp member 24A, specifically in the void portion 24g, and connects the first resin portion 25a and the second resin portion 25b. The third resin portion 25c fills the void portion 24g. The third resin portion 25c is impregnated into the pulp member 24A. In other words, the third resin portion 25c fills the void portion 24g of the pulp member 24A. The void portion 24g is also referred to as an impregnated portion, a filled portion, or the like.

[0029] The resin portion 3 provided for the pulp members 24B and 24C has the same configuration as the resin portion 25 provided for the pulp member 24A.

[0030] The fixing member 23 and the insulating coil 22 are fixed (secured) by a pulp member 24A and a resin portion 25.

[0031] <Insulated coil configuration>

[0032] Fig. 5 is a perspective view showing the configuration of the insulated coil 22 according to the embodiment, and Fig. 6 is a cross-sectional view showing the configuration of the insulated coil 22 according to the embodiment.

[0033] The insulated coil 22 has a laminated conductor 31 (electrical conductor), a turn insulating portion 33, and a main insulating portion 35. The turn insulating portion 33 and the main insulating portion 35 form the insulating structure of the insulated coil 22.

[0034] The laminated conductor 31 is formed by stacking a plurality of conductive wires 31A. The laminated conductor 31 according to this embodiment is formed by bundling 14 conductive wires 31A (7 layers, 2 columns). However, the configuration of the laminated conductor 31 is not limited to this, and should be designed appropriately depending on the usage situation. For example, the laminated conductor 31 may be formed by stacking more than 14 conductive wires 31A, or may be formed by stacking only one conductive wire 31A.

[0035] A turn insulation portion 33 is provided on the outer surface of each conductor 31A. As a result, the outer surface of the laminated conductor 31 is covered with the turn insulation portion 33. A main insulation portion 35 is provided on the outside of the turn insulation portion 33. The main insulation portion 35 includes a wound insulating tape 40 (tape-shaped member).

[0036] The insulating tape 40 according to this embodiment is wound spirally using a half-wrap method. When the width of the insulating tape 40 is W, the spiral pitch is W / 2. That is, the insulating tape 40 is wound so as to overlap half of the insulating tape 40 wound in the previous turn. After winding around the entire longitudinal direction of the laminated conductor 31 is completed, an additional insulating tape 40 may be wound on top of it. This allows the insulating tape 40 to be formed in multiple layers. The more layers of insulating tape 40 there are, the more the insulating performance can be improved. The number of turns of insulating tape 40 may be selected appropriately depending on the required insulating performance, etc.

[0037] FIG. 7 is a cross-sectional view that schematically shows the configuration of an insulating tape 40 according to an embodiment.

[0038] The insulating tape 40 has a base layer 41, two reinforcing layers 43A and 43B, and two adhesive layers 42A and 42B. Hereinafter, the two reinforcing layers 43A and 43B will be collectively referred to as the reinforcing layer 43, and the two adhesive layers 42A and 42B will be collectively referred to as the adhesive layer. The base layer 41 will also be referred to as the main insulating layer, the adhesive layer 42 will also be referred to as the polymer layer, and the reinforcing layer 43 will also be referred to as the fiber-reinforced layer.

[0039] The base layer 41 is made of a non-conductive material and is the main component for realizing the insulating function of the insulating tape 40. The reinforcing layer 43 supports the base layer 41 and ensures the overall strength of the insulating tape 40. The adhesive layer 42 adheres the reinforcing layer 43 to the base layer 41.

[0040] The base layer 41 has a first surface 41a and a second surface 41b opposite to the first surface 41a. The base layer 41 contains an inorganic material such as mica, asbestos, or porcelain powder as a main component. The thickness of the base layer 41 is, for example, thicker than the thicknesses of the reinforcing layer 43 and the adhesive layer 42, and is, for example, approximately 100 μm.

[0041] Of the two adhesive layers 42, adhesive layer 42A is superposed on the first surface 41a, and adhesive layer 42B is superposed on the second surface 41b.

[0042] The adhesive layer 42 includes a bonding polymer, etc. For example, the adhesive layer 42 includes an epoxy resin and nano-sized silica particles 44.

[0043] Two reinforcing layers 43 are provided on the first surface 41a and the second surface 41b, respectively, and are adhered to the base layer 41 by adhesive layers 42. Specifically, reinforcing layer 43A is provided on the first surface 41a and is adhered to the first surface 41a by adhesive layer 42A. Reinforcing layer 43B is provided on the second surface 41b and is adhered to the second surface 41b by adhesive layer 42B.

[0044] The reinforcing layer 43 contains, for example, glass fiber, polyester fiber, etc. as a main component, and is usually woven in a mesh pattern. The reinforcing layer 43 is not limited to fiber, and may be made of nonwoven fabric or a polymer film such as polyester or polyimide. The adhesive layer 42 contains, for example, unsaturated polyester resin, epoxy resin, etc. as a main component.

[0045] <Internal structure of the main insulation part>

[0046] FIG. 8 is a cross-sectional view that schematically shows the internal structure of the main insulating part 35 according to the embodiment.

[0047] 8 shows a cross section along the longitudinal direction of the laminated conductor 31 (conductor wire 31A). Fig. 8 shows a case where the insulating tape 40 is wound twice, and the main insulating part 35 includes a taping layer A formed by the first winding and a taping layer B formed by the second winding.

[0048] The main insulating section 35 includes an insulating tape 40 and a covering section 50. In each of taping layers A and B, adjacent base layers 41 in the longitudinal direction overlap each other by half their width. This is due to the half-wrap winding method described above. The covering section 50 is also called an impregnation section.

[0049] The covering portion 50 adheres (joins) the insulating tape 40 to the turn insulating portion 33 and also adheres the overlapping portions 40a, 40b of the insulating tape 40. The covering portion 50 also covers the laminated conductor 31.

[0050] The covering portion 50 has a resin containing mica particles 55 formed by solidifying a resin 47 described below. The mica particles are an example of a nanofiller. In FIG. 8, the insulating tape 40 is depicted as being thin to emphasize the covering portion 50. As shown in FIG. 8, the insulating tape 40 is surrounded by the covering portion 50 in which the mica particles 55 are dispersed.

[0051] The mica particles 55 are non-conductive nano-order particles, for example, particles containing metal oxide. The particle size of the mica particles 55 is preferably 50 nm or less. Specific examples of materials constituting the mica particles 55 will be described later.

[0052] Fig. 9 is a cross-sectional view of the main insulating part 35, schematically illustrating the effect of the mica particles 55 according to the embodiment. Fig. 10 is a cross-sectional view of the insulating tape 40, schematically illustrating the effect of the silica particles 44 according to the embodiment.

[0053] 9 shows a state in which an electrical tree T has occurred in the coating portion 50. The electrical tree T is an electrical deterioration phenomenon caused by a voltage applied to the laminated conductor 31 and the stator 20. When the electrical tree T progresses and reaches the surface layer of the main insulation portion 35, a dielectric breakdown occurs, causing the rotating electric machine 1 to stop operating.

[0054] The mica particles 55 dispersed in the coating 50 have a propagation suppression effect of suppressing the linear propagation of the electrical tree T and slowing down the propagation speed of the electrical tree T. This can improve the insulating performance of the main insulation 35. This propagation suppression effect strongly depends not only on the content of the mica particles 55 but also on their dispersibility. The propagation suppression effect increases as the dispersibility (uniformity of dispersion) of the mica particles 55 in the coating 50 increases. Therefore, in order to improve the propagation suppression effect (insulating performance), it is important to use a resin with high dispersibility of the mica particles 55.

[0055] 10 , the electrical tree T tends to propagate on the first surface 41a and the second surface 41b of the base layer 41 in the insulating tape 40. That is, the electrical tree T propagates through the adhesive layer 42 in the insulating tape 40. At this time, the silica particles 44 in the adhesive layer 42 suppress the propagation of the electrical tree T. The first surface 41a and the second surface 41b of the base layer 41 can also be said to be the interface between the base layer 41 and the adhesive layer 42.

[0056] <Insulation structure manufacturing method>

[0057] Fig. 11 is a flowchart showing the steps in the method for manufacturing the insulating structure of the insulated coil 22 according to the embodiment. Fig. 12 is a diagram showing the state of an impregnation apparatus 60 used in the method for manufacturing the insulating structure according to the embodiment in a first half of the process. Fig. 13 is a diagram showing the state of an impregnation apparatus 60 used in the method for manufacturing the insulating structure according to the embodiment in a second half of the process. The insulating structure of the insulated coil 22 includes a resin portion 25, and the method for manufacturing the insulating structure of the insulated coil 22 is, for example, a vacuum pressure impregnation method.

[0058] First, insulating tape 40 is wound around laminated conductor 31 (see FIG. 5) to form insulated coil 22 before resin impregnation (S101). Then, the insulated coil before resin impregnation is inserted into slot 21b of stator core 21, and pulp member 24 and fixing member 23 are attached to stator core 21 to form stator unit 90 (see FIG. 12) (S102). Then, stator unit 90 is placed in impregnation device 60 (S103), and the inside of impregnation device 60 is evacuated (S104).

[0059] 12, the impregnation device 60 includes an airtight container 61, an exhaust pipe 62, an exhaust valve 62A, a supply pipe 63, a supply valve 63A, and a treatment tank 64. In step S103, the stator unit 90 is placed in the treatment tank 64 placed in the airtight container 61. Then, in step S104, the airtight container 61 is evacuated. When evacuating, the supply valve 63A is closed, and air is sucked out of the airtight container 61 by a suction device connected to the exhaust pipe 62. As a result, the inside of the insulated coil 22, the turn insulating portion 33, and the space within the insulating tape 40 wound therearound are all evacuated.

[0060] After evacuation as described above, the stator unit 90 in the treatment tank 64 is immersed in the resin 47 (S105), as shown in Fig. 13. At this time, the exhaust valve 62A is closed, and the resin 47 is supplied into the treatment tank 64 from the supply pipe 63. The resin 47 is supplied so that the entire stator unit 90 is immersed.

[0061] After the stator unit 90 is immersed in the resin 47 as described above, the impregnation device 60 (airtight container 61) is pressurized (S106). As shown in FIG. 13, the pressurization is performed by opening the supply valve 63A and supplying pressurized gas 65 into the airtight container 61 from the supply pipe 63. The pressurized gas 65 is preferably a substance that does not react with the resin 47, and is preferably an inert gas such as nitrogen gas or dry air. By pressurizing the airtight container 61 in this manner, the resin 47 containing the mica particles 55 is impregnated into the turn insulating portion 33 of the insulated coil 22 and the overlapping portion of the insulating tape 40. At this time, the resin 47 also impregnates the pulp members 24A to 24C. At this time, resin 47 is impregnated (filled) between pulp member 24A and fixing member 23, between pulp member 24A and insulating coil 22, between pulp member 24B and layer 22a of insulating coil 22, between pulp member 24B and layer 22b of insulating coil 22, between pulp member 24C and layer 22b of insulating coil 22, and between pulp member 24C and stator core 21 (bottom of slot 21b).

[0062] The stator unit 90 is then removed from the impregnation device 60 (S107), and the resin 47 impregnated into the interior of the insulating coil 22 including the insulating tape 40, the interior of the pulp members 24A-24C, and the exterior of the pulp members 24A-24C is solidified (S108). The method for solidifying the resin 47 is determined depending on the properties of the epoxy resin used. For example, when a thermosetting epoxy resin is used, the stator unit 90 may be placed in a drying oven at a predetermined temperature for a predetermined time, ultimately resulting in the stator 20 (see FIG. 1). The stator 20 is then attached to the frame 6 that forms the outer shell. Depending on the specifications of the rotating electric machine 1, the insulating coil 22 may be assembled into the stator core 21 that is pre-assembled in the frame 6. In this case, the assembled assembly of the frame 6, the stator core 21, and the insulating coil 22 is treated as the stator unit 90. As can be seen from the above, the resin portion 25 includes the resin 47, which is an example of a resin. The resin of the resin portion 25 is not limited to the resin 47 .

[0063] <Resin composition>

[0064] The resin 47 according to this embodiment is a composition produced by mixing an epoxy resin, a nanofiller, a reactive diluent, and an acid anhydride-based curing agent (hardening agent).

[0065] Epoxy resins include compounds that contain two or more three-membered rings consisting of two carbon atoms and one oxygen atom per molecule and can be cured. Epoxy resins include, for example, bisphenol A epoxy resins, alicyclic epoxy resins, bisphenol F epoxy resins, biphenyl epoxy resins, naphthalene epoxy resins, novolac epoxy resins, and phenol novolac epoxy resins as their main components. The epoxy resin may contain one of these compounds alone or two or more of them. In particular, it is preferable for the epoxy resin to contain an alicyclic epoxy resin from the viewpoint of chemical affinity with reactive diluents.

[0066] Nanofillers include non-conductive metal oxides and the like. Nanofillers include, for example, alumina, silica, titanium oxide, magnesium oxide, bismuth trioxide, cerium dioxide, cobalt monoxide, copper oxide, iron trioxide, holmium oxide, indium oxide, manganese oxide, tin oxide, yttrium oxide, zinc oxide, and the like as their main components. Nanofillers may contain these compounds alone or in combination. The surface of the nanofiller may be modified with a coupling agent to improve dispersibility in epoxy resins, prevent re-aggregation, improve adhesion, and the like.

[0067] Reactive diluents react with epoxy resins to reduce their viscosity. Reactive diluents include compounds that have reactive groups in their molecular skeletons and thus can become part of the skeleton of the cured product of a thermosetting resin composition. Examples of reactive diluents include butyl glycidyl ether, 1,4-butanediol diglycidyl ether, alkylene monoglycidyl ether, alkylphenol monoglycidyl ether, polypropylene glycol diglycidyl ether, alkylene diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, 1,12-dodecanediol diglycidyl ether, o-cresyl glycidyl ether, and 1,2-epoxytetradecane as their main components. The reactive diluent may contain one of these compounds alone or two or more of them. In particular, when the epoxy resin contains an alicyclic epoxy resin, it is preferable for the reactive diluent to contain butyl glycidyl ether.

[0068] The acid anhydride curing agent contains, as a main component, for example, 4-methylhexahydrophthalic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, 4-methyltetrahydrophthalic anhydride, tetrabromophthalic anhydride, nadic anhydride, methylnadic anhydride, trimellitic anhydride, pyromellitic anhydride, methylhimic anhydride, etc. The acid anhydride curing agent may contain these compounds alone or in combination of two or more.

[0069] A curing accelerator may be used to speed up the reaction in the process of solidifying (curing) the resin 47 in a drying oven or the like. The curing accelerator includes, for example, a compound that can accelerate the crosslinking reaction between an epoxy compound and an acid anhydride curing agent. The curing accelerator includes, for example, a metal chelate compound, an ammonium ion compound, an imidazole compound, or the like as a main component. The curing accelerator may include one of these compounds alone or two or more of them.

[0070] Resin 47 contains, for example, an epoxy resin, a nanofiller, a reactive diluent, and an acid anhydride curing agent in the following proportions. Epoxy resin: 30wt%~60wt% …(1) Acid anhydride hardener: 30 wt% to 60 wt% … (2) Reactive diluent: 5wt%~30wt% …(3) Nanofiller: 2 wt% to 30 wt% of the total mixture of (1) to (3)

[0071] <Effects of the embodiment>

[0072] As described above, in this embodiment, the rotating electric machine 1 includes the stator 20 and the rotor 10. The rotor 10 is rotatable relative to the stator 20. The stator 20 includes a stator core 21, an insulated coil 22 (stator winding), a fixing member 23, a pulp member 24A, a first resin portion 25a, and a second resin portion 25b. The stator core 21 has an inner circumferential surface 21a that surrounds the rotor 10, and is provided with concave slots 21b in the inner circumferential surface 21a. The insulated coil 22 is inserted in the slots 21b. The fixing member 23 is located within the slots 21b on the rotor 10 side with respect to the insulated coil 22 and is fixed to the stator core 21. The pulp member 24A includes pulp and is provided between the insulated coil 22 and the fixing member 23. The first resin portion 25a contains a resin and is interposed between the fixing member 23 and the pulp member 24A to fix the fixing member 23 to the pulp member 24A. The second resin portion 25b contains a resin and is interposed between the insulating coil 22 and the pulp member 24A to fix the insulating coil 22 to the pulp member 24A.

[0073] With this configuration, the fixing member 23 and the insulated coil 22 are fixed to each other via the first resin portion 25a, the pulp member 24A, and the second resin portion 25b, which makes it easy to maintain the fixed state between the fixing member 23 and the insulated coil 22 for a long period of time. This makes it possible to prevent the insulated coil 22 from becoming loose, and to prevent electromagnetic vibration (fretting).

[0074] Here, the pulp member 24A is a filler member between the fixing member 23 and the insulating coil 22, and it prevents the insulating coil 22 from being scratched and adjusts the gap between the fixing member 23 and the insulating coil 22. When this filler member is made of a glass cloth laminate, the surface of the glass cloth laminate is smooth and flat, making it difficult for gaps to form between the glass cloth laminate and the fixing member 23 and between the glass cloth laminate and the insulating coil 22. Therefore, in the vacuum pressure impregnation method, it is difficult for the resin 47 to impregnate (fill) between the glass cloth laminate and the fixing member 23 and between the glass cloth laminate and the insulating coil 22. Therefore, even if the resin 47 does enter between the glass cloth laminate and the fixing member 23 and between the glass cloth laminate and the insulating coil 22, the amount of resin 47 is small. Therefore, the resin 47 gradually thins due to vibration, etc., making it difficult to maintain the fixed state between the fixing member 23 and the insulating coil 22 for a long period of time.

[0075] In contrast, the pulp member 24A of this embodiment has surfaces (one side 24a, the other side 24b) that are not smooth and flat but have an uneven shape with concave and convex portions 25d. Therefore, larger gaps are more likely to occur between the one side 24a and the fixing member 23 and between the other side 24b and the insulating coil 22 than in a glass cloth laminate. Therefore, a larger amount of resin 47 enters between the pulp member 24A and the fixing member 23 and between the pulp member 24A and the insulating coil 22. In other words, the resin is highly impregnated. Therefore, the resin 47 is retained between the pulp member 24A and the fixing member 23 and between the pulp member 24A and the insulating coil 22 for a long period of time, which makes it easier to maintain the fixed state between the fixing member 23 and the insulating coil 22 for a long period of time. Furthermore, the above configuration reduces the labor required by workers compared to, for example, when workers manually create uneven portions in a glass cloth laminate.

[0076] The stator 20 also has a third resin portion 25c. The third resin portion 25c contains resin, is provided inside the pulp member 24A, and connects the first resin portion 25a and the second resin portion 25b.

[0077] With this configuration, the fixed state between the fixing member 23 and the insulated coil 22 is more likely to be maintained for a longer period of time.

[0078] The above-described embodiments of the present invention do not limit the scope of the invention, but are merely examples within the scope of the invention. Some embodiments of the present invention may be modified, omitted, or added to the above-described embodiments, for example, with respect to at least part of the specific applications, structures, shapes, actions, and effects, without departing from the spirit of the invention. [Explanation of symbols]

[0079] 1...rotating electric machine, 10...rotor, 20...stator, 21...stator core, 21a...inner surface, 21b...slot, 22...insulated coil (stator winding), 23...fixing member, 24, 24A...pulp member, 25a...first resin part, 25b...second resin part, 25c...third resin part.

Claims

1. A stator; a rotor rotatable relative to the stator; Equipped with The stator includes: a stator core having an inner circumferential surface surrounding the rotor and having concave slots formed in the inner circumferential surface; a stator winding inserted in the slot; a fixed member located in the slot on the rotor side with respect to the stator winding and fixed to the stator core; a pulp member including pulp and provided between the stator winding and the fixed member; a first resin portion including a resin, interposed between the fixing member and the pulp member, and fixing the fixing member and the pulp member together; a second resin portion including a resin, interposed between the stator winding and the pulp member, and fixing the stator winding and the pulp member together; It had Rotating electric motor.

2. the stator includes a third resin portion that includes a resin, is provided inside the pulp member, and connects the first resin portion and the second resin portion; The rotating electric machine according to claim 1 .

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