Armature, rotary electric machine, manufacturing method for armature and manufacturing method for rotary electric machine

Abstract

To provide a high-performance, high-quality and low-cost armature, a rotary electric machine, a manufacturing method for the armature and a manufacturing method for the rotary electric machine.SOLUTION: An armature includes: an armature core 11 having a plurality of teeth 15a arranged in a circumferential direction Y; a coil 12 wound around the teeth 15a through an insulation structure 13; and a resin 14 for fixing the armature core 11, the insulation structure 13 and the coil 12. An uneven part 17 extending in at least one of the axial, radial and circumferential directions of the armature core 11 is formed at an opposing surface of one of opposing parts of the armature core 11 and the insulation structure 13. A resin layer 14Z as a part of the resin 14 is formed between the armature core 11 and the insulation structure 13.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to an armature, a rotating electric machine, a method for manufacturing an armature, and a method for manufacturing a rotating electric machine. [Background technology]

[0002] Conventionally, a known method for fixing an iron core and a coil wound around the iron core involves filling the spaces between the conductors of the coil and between the coil and the iron core with thermosetting resin (varnish), and then heating the spaces to harden the thermosetting resin.

[0003] One method for heating and curing varnish is the electric current heating method, which utilizes Joule heat generated when electricity is passed through a coil. As an example of background art, see Patent Document 1. This document discloses an insulating varnish impregnation method including a coil preheating step for preheating an electric device coil made of an iron core and a winding wound around the iron core, a varnish impregnation step for impregnating the coil with varnish, and a varnish curing step for heating and curing the varnish attached to the coil by the impregnation step, and the heating in the varnish curing step is performed by electric current heating of the coil.

[0004] Furthermore, Patent Document 2 discloses a method for independently performing induction heating of the stator core and electrical heating of the coil by providing an induction heating coil facing the inner or outer peripheral surface of the stator core and power supply terminals connected to the coil ends. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4160041 [Patent Document 2] Patent No. 4887990 Summary of the Invention [Problem to be solved by the invention]

[0006] In the heating method of Patent Document 1, heat is absorbed from the coil to the iron core, so the temperature of the coil drops, especially in the area where the coil and the iron core are close to each other, and the difference in temperature of the varnish causes a difference in viscosity, which reduces the surface tension and increases the dripping of the varnish. This reduces the adhesive strength between the conductors of the coil and between the coil and the iron core. Alternatively, there is a problem that the performance of the rotating electric machine decreases due to the deterioration of the heat dissipation performance from the coil to the iron core, and the quality decreases and the lifespan becomes shorter.

[0007] Furthermore, the heating method disclosed in Patent Document 2 requires two power sources, one for current heating of the coil and one for induction heating of the core, which increases the size of the equipment for heating the stator, resulting in an increase in the cost and space required for the equipment, and thus an increase in the manufacturing cost of the rotating electric machine.

[0008] The present disclosure discloses techniques for solving the problems described above, and aims to provide a high-performance, high-quality, and low-cost armature, a rotating electric machine, a method for manufacturing an armature, and a manufacturing method for a rotating electric machine. [Means for solving the problem]

[0009] The armature disclosed in the present disclosure comprises: an armature core having a plurality of teeth arranged in a circumferential direction; A coil wound around the teeth via an insulating structure; a resin that fixes the armature core, the insulating structure, and the coil; a concave-convex portion is formed on one of the opposing surfaces of the opposing portions of the armature core and the insulating structure, the concave-convex portion extending in at least one of the axial direction, the radial direction, and the circumferential direction of the armature core; A resin layer is formed as a part of the resin between the armature core and the insulating structure. Further, the rotating electric machine disclosed in the present disclosure is The armature is provided. Further, a method for manufacturing an armature disclosed in the present disclosure includes: an impregnation step of impregnating the armature core, the insulating structure, and the coil with a thermosetting resin, a part of which becomes the resin layer; and a curing step of applying current to the coil to heat and cure the thermosetting resin. In addition, the manufacturing method of a rotating electric machine disclosed in the present disclosure is such that a rotor is disposed facing the inside of a stator serving as the armature with a gap therebetween. Effect of the Invention

[0010] According to the armature, rotating electric machine, armature manufacturing method, and rotating electric machine manufacturing method disclosed in the present disclosure, it is possible to provide a high-performance, high-quality, and low-cost armature, rotating electric machine, armature manufacturing method, and rotating electric machine manufacturing method. [Brief description of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view of a rotating electric machine according to a first embodiment. [Diagram 2] 1 is a perspective view of a stator of a rotating electric machine according to a first embodiment. [Diagram 3] 1 is a cross-sectional view of a stator (armature) of a rotating electric machine according to a first embodiment, cut perpendicularly to an axial direction Z of a rotating shaft. [Figure 4] FIG. 4 is an enlarged view of a main part A in FIG. 3. [Diagram 5] 3 is a cross-sectional view of a conductor forming a stator coil and a rotor coil according to the first embodiment. FIG. [Figure 6] 2 is a schematic cross-sectional view of a main portion of a stator according to the first embodiment. FIG. [Figure 7] 5 is a flowchart showing a manufacturing process of the stator according to the first embodiment. [Figure 8] FIG. 2 is a schematic diagram showing a direct current heating method for curing a thermosetting resin according to the first embodiment. [Figure 9] Fig. 9A is a front view of core piece 211A, and Fig. 9B is a front view of core piece 211B. [Figure 10] FIG. 11 is a perspective view showing a main portion of a configuration of a stator core according to a second embodiment. [Figure 11] 11 is a schematic cross-sectional view of a main portion of a stator according to embodiment 3. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Embodiment 1 Hereinafter, the armature, the rotating electric machine, the method for manufacturing the armature, and the method for manufacturing the rotating electric machine according to the first embodiment will be described with reference to the drawings. In this specification, unless otherwise specified, the terms "axial direction", "circumferential direction", "radial direction", "inner peripheral side", "outer peripheral side", "inner peripheral surface", and "outer peripheral surface" refer to the "axial direction", "circumferential direction", "radial direction", "inner peripheral side", "outer peripheral side", "inner peripheral surface", and "outer peripheral surface" of the stator (armature), respectively. Furthermore, unless otherwise specified, when referring to "upper" and "lower", a plane perpendicular to the axial direction is assumed at the referenced location, and the side including the center point of the stator with the plane as the boundary is referred to as "lower", and the opposite is referred to as "upper". Furthermore, when comparing heights, the side with a longer distance from the center of the stator is referred to as "higher". Furthermore, the radial direction of the stator is referred to as the radial direction X, the circumferential direction of the stator is referred to as the circumferential direction Y, and the axial direction of the stator is referred to as the axial direction Z. The radial direction X, the circumferential direction Y, and the axial direction Z also coincide with the radial direction, circumferential direction, and axial direction of the rotor (armature) and the rotating electric machine.

[0013] FIG. 1 is a cross-sectional view of a rotating electric machine 100. FIG. 2 is a perspective view of the stator 10 of the rotating electric machine 100. As shown in FIG. FIG. 3 is a cross-sectional view of a stator 10 (armature) of a rotating electric machine 100 cut perpendicularly to an axial direction Z of a rotating shaft. FIG. 4 is an enlarged view of a main part A in FIG. FIG. 5 is a cross-sectional view of the conductor wire W that forms the coil 12 of the stator 10 and the coil 52 of the rotor 50. FIG. 6 is a schematic cross-sectional view of a main portion of the stator 10 according to the first embodiment.

[0014] 1 and 2, a rotating electric machine 100 includes an annular stator 10, a cylindrical rotor 50 disposed inside the stator 10 and rotatably facing the stator 10 with a gap therebetween, and a case 60 that houses them. The rotation axis of the rotor 50 is the rotation axis C shown in FIG.

[0015] The case 60 has a cylindrical case body 61 with a bottom that is open at one end in the axial direction Z, and a disk-shaped lid 62 that covers the opening of the case body 61. The stator 10 is fixed to the inside of the peripheral wall of the case body 61.

[0016] The bottom wall and the lid 62 of the case body 61 are provided with through holes in which the shaft 55 of the rotor 50 is disposed, and a bearing 63 is fixed to the inside of each through hole. The axis of each bearing 63 coincides with the rotation axis C of the rotor 50.

[0017] The rotor 50 is a wound rotor and includes a shaft 55, a rotor core 51 (armature core), a coil 52 wound around the rotor core 51, and an insulating structure 53 such as an insulator and insulating paper that is installed on the rotor core 51. The shaft 55 is fixed to the rotor core 51 by means of press fitting, shrink fitting, or the like, and is rotatably supported via bearings 63 on both sides of the case 60 in the axial direction Z.

[0018] The stator 10 has a stator core 11 (armature core), a coil 12 wound around the stator core 11, and an insulating structure 13 such as an insulator or insulating paper that is installed on the stator core 11.

[0019] The stator core 11 and the rotor core 51 are laminated cores in which thin-plate-like core pieces, which are made by pressing electromagnetic steel plate or SPCC (Steel Plate Cold Commercial) material and processing them into a predetermined shape by means of electric discharge machining or the like, are stacked in the axial direction Z. Each core has a plurality of teeth arranged at equal pitches in the circumferential direction Y.

[0020] The insulating structures 13, 53 are formed from a material with excellent electrical insulating properties, such as polyimide, polyethylene terephthalate (PET), polyphenylene sulfide (PPS), or polybutylene terephthalate (PBT), and are each arranged on the teeth.

[0021] The coils 12, 52 are formed by winding a conductor W made of copper, aluminum, or the like, around the teeth, the cross section of which is shown in Fig. 5. The conductor W is a conductor having a conductor portion W1 and a surface of the conductor portion W1 covered with an insulating coating W2 such as enamel resin. The conductor W is wound around each tooth via an insulating structure 13, 53.

[0022] Furthermore, a thermosetting resin 14 (hereinafter simply referred to as resin 14) is filled in the gaps between the stator core 11 and the insulating structure 13, between the rotor core 51 and the insulating structure 53, between the insulating structure 13 and the coil 12, between the insulating structure 53 and the coil 52, and between the conductors W of the coils 12 and 52. The resin 14 ensures adhesion, heat dissipation, and insulation between the various components.

[0023] The resin 14 is an insulating thermosetting resin, such as an unsaturated polyester resin, an epoxy resin, or a liquid crystal polymer.

[0024] Next, the detailed structure of the stator 10 will be described with reference to FIGS. 2 to 4 and 6. FIG. 3, the stator core 11 has an annular core back 15b, a plurality of teeth 15a protruding from an inner peripheral wall surface of the core back 15b toward the inside in the radial direction X at regular intervals in the circumferential direction Y, and shoes 15c protruding from the tips of the teeth 15a on both sides in the circumferential direction Y. A slot 16 is formed by being surrounded by the core back 15b and the teeth 15a adjacent to each other in the circumferential direction Y. Providing the shoes 15c on the stator core 11 reduces the magnetic resistance between the rotor 50 and the stator 10, thereby reducing the iron loss of the rotor 50.

[0025] The stator core 11 has an integral core structure in which the core back 15b is integrally formed over 360°, or a split core structure in which a plurality of split cores are arranged in the circumferential direction Y and joined by means of welding or the like. The stator core 11 shown in Fig. 3 has a split core structure.

[0026] The insulating structure 13 is formed by injection molding a thermoplastic resin such as PPS or PBT into a predetermined shape. For example, the insulating structure 13 is molded into a U-shape with a width slightly larger than that of the teeth 15a, and is fixed by fitting it into both sides of the axial direction Z of the teeth 15a.

[0027] Alternatively, an insulating paper made by sandwiching a thin plate material such as PET between flame-retardant papers may be directly attached to the slot 16 using tape or adhesive. Both may be used alone or in combination.

[0028] With the insulating structure 13 attached to the stator core 11, the coils 12 are wound around the teeth 15a via the insulating structure 13. In the case of concentrated winding, the coils are wound directly around the teeth 15a, while in the case of distributed winding, the coils 12 are wound around the teeth 15a across multiple slots. As a result, the coils 12 are wound around the teeth 15a via the insulating structure 13, so that even if electricity is passed through the coils 12, there is no electrical continuity to the teeth 15a.

[0029] The stator core 11, the insulating structure 13, and the coil 12 are fixed together with resin 14. A groove 17 extending in the axial direction Z of the stator core 11 is formed on the opposing surface of the stator core 11 at the opposing portion between the stator core 11 and the insulating structure 13, and a resin layer 14Z as part of the resin 14 is formed between the stator core 11 and the insulating structure 13.

[0030] Next, a method for manufacturing the stator 10 of the rotating electrical machine 100 will be described. FIG. 7 is a flowchart showing the manufacturing process of the stator 10. FIG. 8 is a schematic diagram showing a resistive heating method for curing the thermosetting resin 14. As shown in FIG. First, in the core lamination process of step S1, a predetermined number of core pieces are laminated in the axial direction Z (plate thickness direction) and the laminated layers are crimped, glued, or fixed by fastening means such as screws or rivets to manufacture stator core 11.

[0031] Next, in the insulation assembly process of step S2, an insulation structure 13 is installed on the stator core 11 so that the current flowing through the coil 12 does not leak to the stator core 11.

[0032] Next, in a winding process of step S3, an insulating coated conductor W is wound around the teeth 15a of the stator core 11 shown in Fig. 6 via an insulating structure 13 to form the coils 12. Next, in a connecting process of step S4, the multiple wound coils 12 are connected together.

[0033] Next, in a resin impregnation process of step S5, liquid resin 14 is filled into the gaps between the various components of stator core 11, insulating structure 13, and coil 12, between the conductors W of coil 12, and between adjacent coils 12, and in a resin heating process of step S6, current is passed through coil 12 as shown in Fig. 8 to heat coil 12 and harden the applied resin 14. In these two processes, stator core 11, insulating structure 13, coil 12, and conductors W of coil 12 are fixed to each other, and a resin layer 14Z shown in Fig. 6 is formed between the opposing surfaces of insulating structure 13 and stator core 11.

[0034] Specific methods for the resin impregnation process include a drop impregnation method in which the resin 14 is dropped from a nozzle and applied to the desired area, an immersion impregnation method in which the coil 12 is immersed in liquid resin 14 stored in a resin tank and impregnated by capillary action, and a vacuum impregnation method in which the stator 10 is placed in a container, vacuumed, and then the resin 14 is injected. These methods are used depending on the application, the type of coil 12 to be processed, and the process.

[0035] The resin heating process involves heating and hardening the impregnated resin 14. Methods include a hot air heating method in which the stator 10 is placed in a furnace and heated with hot air, an induction heating method in which the stator core 11 is induction heated, and a resistance heating method in which electricity is passed through the coil 12 to heat it using Joule heat.

[0036] The resistance heating method will be explained with reference to FIG. The electric current heating method is a technique in which electricity is directly applied to the coil 12 to which the resin 14 is applied, and the resin 14 is hardened by Joule heat generated by this current application.

[0037] Generally, the stator 10 is preheated before being impregnated with the resin 14 in order to remove moisture and to relieve stress (annealing treatment) during winding of the coil 12. The heating method may be hot air heating, induction heating, or electrical heating.

[0038] Although the manufacturing method of the stator 10 has been explained so far, the manufacturing method of the rotor 50 is generally similar to the manufacturing method of the stator 10, except for the addition of the step of assembling the shaft 55.

[0039] By applying liquid resin 14 to coil 12 while it is wound around teeth 15a, resin 14 fills gaps between each component of stator core 11, insulating structure 13, and coil 12, between conductors W of coil 12, and between adjacent coils 12. Resin 14 is heated and hardened in this state to prevent coil 12 from unwinding.

[0040] It is also possible to protect the insulating coating W2 formed on the coil 12 and maintain the insulating performance of the coil 12. It is also possible to improve the vibration resistance after being mounted on the rotating electric machine 100. Furthermore, by filling the spaces between the components with resin 14, it is possible to reduce the thermal resistance and improve the heat dissipation performance of the stator 10.

[0041] However, since the resin 14 is applied in a liquid state, the resin 14 drips down after application until it hardens. In particular, a gap is formed between the insulating structure 13 and the teeth 15a for assembly, so the amount of dripping from this portion increases. Furthermore, particularly when the electric heating method is used, the only heated portion during the heat hardening of the resin 14 is the coil 12, so a temperature difference occurs between the insulating structure 13 and the teeth 15a. As a result, it takes time to raise the temperature of the resin 14 filled in the gap between the insulating structure 13 and the teeth 15a to a temperature at which it hardens. Since the viscosity of the resin 14 changes depending on the temperature, if it takes time to raise the temperature, the resin 14 is exposed to a temperature range where the viscosity decreases (becomes thinner) for a longer period of time, and the amount of dripping of the resin 14 increases.

[0042] 6, in the first embodiment, grooves 17 (uneven portions) are formed on opposing surfaces 11T on the stator core 11 side (at least on both side surfaces in the circumferential direction Y of the teeth 15a and on one side of the inner peripheral surface in the radial direction X of the core back 15b) of the opposing portions of the stator core 11 and the insulating structure 13. The grooves 17 are formed so as to extend over the entire length of the stator core 11 in the axial direction Z. As a result, even if the temperature of the resin 14 rises and the viscosity of the resin 14 decreases, the surface tension can be maintained by the capillary phenomenon, and the amount of dripping of the resin 14 can be reduced.

[0043] 6, if groove 17 is formed so that its width gradually narrows from its opening on the slot 16 side toward the bottom of groove 17, resin 14 between stator core 11 and insulating structure 13 (this portion is resin layer 14Z) will act as a wedge, in addition to preventing sagging, and the adhesive strength between stator core 11 and insulating structure 13 will be increased. Furthermore, even if an electrical heating method is used as the means for heating resin 14, resin sagging can be suppressed, and the curing time of resin 14 can be shortened. In this embodiment, the grooves 17 are provided in both the teeth 15a and the core back 15b, but they may be provided in only one of them.

[0044] According to the armature according to the first embodiment, an armature core having a plurality of teeth arranged in a circumferential direction; A coil wound around the teeth via an insulating structure; a resin that fixes the armature core, the insulating structure, and the coil; a concave-convex portion is formed on one of the opposing surfaces of the opposing portions of the armature core and the insulating structure, the concave-convex portion extending in at least one of the axial direction, the radial direction, and the circumferential direction of the armature core; Since a resin layer is formed as a part of the resin between the armature core and the insulating structure, Even if the temperature of resin 14 rises and the viscosity of resin 14 drops, the surface tension of resin 14 can be maintained by capillary action, reducing the amount of resin dripping. This allows the gap between insulating structure 13 and stator core 11 to be filled with resin 14, making it possible to obtain a stator 10 with excellent heat dissipation performance, and to provide a rotating electric machine 100 with high output, high quality, and long life.

[0045] In addition, the groove extends in the axial direction, and the width of the groove is gradually narrowed from the opening on the slot side that houses the coil toward the bottom of the groove. In addition to the effect of preventing sagging of the resin 14, the resin 14 (resin layer 14Z) between the stator core 11 and the insulating structure 13 acts as a wedge, increasing the bonding strength between the stator core 11 and the insulating structure 13. This makes it possible to obtain a stator 10 that is excellent in heat dissipation performance and has high strength, and to provide a rotating electric machine 100 that has high output, high quality, and a long life.

[0046] an impregnation step of impregnating the armature core, the insulating structure, and the coil with a thermosetting resin, a part of which becomes the resin layer; and a curing step of applying current to the coil to heat and cure the thermosetting resin. Even if an electrical heating method is used as a means for heating the resin 14, dripping of the resin can be suppressed, and therefore the hardening time of the resin 14 can be shortened. This makes it possible to obtain a rotating electric machine 100 equipped with an inexpensive stator 10 with excellent productivity. The above effects also apply to the rotor 50.

[0047] Embodiment 2 The armature, the rotating electric machine, the manufacturing method of the armature, and the manufacturing method of the rotating electric machine according to the second embodiment will be described below, focusing on the differences from the first embodiment. Note that components that are substantially the same as those in the first embodiment will be given the same reference numerals and descriptions thereof will be omitted.

[0048] Fig. 9A is a front view of core piece 211A, and Fig. 9B is a front view of core piece 211B. FIG. 10 is a perspective view of a main part showing the configuration of a stator core 211 according to the second embodiment.

[0049] The first embodiment and the second embodiment are different in the configuration of the stator core 211. 9 and 10, the stator core 211 is formed by alternately stacking two types of core pieces 211A and 211B in the axial direction Z. The core pieces 211A and 211B have different widths in the circumferential direction Y of the teeth 215Aa and the teeth 215Ba, with the width WAT of the teeth 215Aa being larger than the width WBT of the teeth 215Ba. The core backs 215Ab and 215Bb also have different widths in the radial direction X, with the width WAY of the core back 215Ab being larger than the width WBY of the core back 15Bb.

[0050] As shown in FIG. 10, by stacking core pieces 211A, 211B alternately in the axial direction Z, grooves 217 extending in the radial direction X and circumferential direction Y can be formed on both side surfaces in the circumferential direction Y of teeth 215a of the stator core 211 and in the core back 215b.

[0051] According to the armature according to the second embodiment, The groove is formed by stacking a plurality of types of core pieces having different widths in the portion that forms the slot for accommodating the coil in the axial direction. Even if the temperature of resin 14 rises and the viscosity of resin 14 drops, the surface tension of resin 14 can be maintained by capillary action to reduce the amount of dripping, so that the gap between insulating structure 13 and stator core 211 is filled with resin 14. In addition, core pieces 211A and 211B are fixed together by resin 14, so the strength of stator core 211 is increased. This makes it possible to obtain stator 20 with excellent heat dissipation performance and high strength, and therefore makes it possible to provide rotating electric machine 100 with high output, high quality, and long life.

[0052] Furthermore, even if an electrical heating method is used as a means for heating the resin 14, dripping of the resin 14 can be suppressed, and therefore the hardening time of the resin 14 can be shortened. This makes it possible to obtain a rotating electric machine 100 equipped with an inexpensive stator 20 with excellent productivity. In this embodiment, two types of core pieces 211A, 211B are used in which the width of the teeth in the circumferential direction Y and the width of the core back in the radial direction X (the portion forming the slot) are different, but it is also possible for only one of the widths to be different.

[0053] Embodiment 3 The armature, the rotating electric machine, the method for manufacturing the armature, and the method for manufacturing the rotating electric machine according to the third embodiment will be described below, focusing on the differences from the first embodiment. Components that are substantially the same as those in the first embodiment are given the same reference numerals and the description thereof will be omitted.

[0054] FIG. 11 is a schematic cross-sectional view of a main part of a stator according to the third embodiment. In the first embodiment, grooves 17 were provided on both side surfaces in the circumferential direction Y of the teeth 15a of the stator core 11 and on the inner surface in the radial direction X of the core back 15b. However, in the third embodiment, the only difference from the first embodiment is that uneven portions 32 are formed on the teeth 315a of the insulating structure 313 and on the opposing surface 313T facing the core back 315b.

[0055] Of the opposing portions between the stator core 311 and the insulating structure 313, the uneven portion 32 is formed by molding or a mold on the opposing surface 313T on the insulating structure 313 side. Then, the resin layer 14Z is formed between the stator core 311 and the insulating structure 313.

[0056] According to the armature according to the third embodiment, Since the uneven portion is formed on the insulating structure, Even if the temperature of resin 14 rises and the viscosity of resin 14 drops, the surface tension of resin 14 can be maintained and the amount of dripping can be reduced by capillary action, so that resin 14 fills the gap between insulating structure 313 and stator core 311. This makes it possible to obtain stator 10 with excellent heat dissipation performance, and therefore a rotating electric machine 100 with high output, high quality, and long life can be provided.

[0057] Furthermore, even if an electrical heating method is used as a means for heating the resin 14, dripping of the resin 14 can be suppressed, and therefore the hardening time of the resin 14 can be shortened. This makes it possible to obtain a rotating electric machine 100 equipped with an inexpensive stator 10 with excellent productivity.

[0058] The cross-sectional shapes, grooves, shapes and numbers of recesses and protrusions, number of teeth, and number of coil turns of the stators and rotors shown in the first to third embodiments are not limited to those shown in the drawings, and can be changed as desired. Although the effects have been described using a stator, the same effects can also be obtained with a rotor. Although the rotors in the drawings are described as being wound rotors, for example, a rotor using permanent magnets may be used, and the structure for preventing resin dripping may be applied only to the stator.

[0059] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless modifications not exemplified are assumed within the scope of the technology disclosed in this disclosure, including, for example, modifying, adding, or omitting at least one component, and further, extracting at least one component and combining it with a component of another embodiment. [Explanation of symbols]

[0060] 100 rotating electric machine, 10 stator, 11,211,311 stator core, 12 coil, 13,313 insulating structure, 11T,313T opposing surface, 14 Thermosetting resin, 15a, 215a, 215Aa, 215Ba, 315a Teeth, 15b, 215b, 215Ab, 215Bb, 315b coreback, 15c shoe, 16 slot, 17,217 groove, 20 stator, 211A, 211B iron core piece, 32 uneven portion, 50 rotor, 51 rotor core, 52 coil, 53 insulating structure, 55 shaft, 60 case, 61 case body, 62 cover, 63 bearing, C rotating shaft, W conducting wire, W1 conductor part, W2 insulation coating.

Claims

1. an armature core having a plurality of teeth arranged in a circumferential direction; A coil wound around the teeth via an insulating structure; a resin that fixes the armature core, the insulating structure, and the coil; a concave-convex portion is formed on one of the opposing surfaces of the opposing portions of the armature core and the insulating structure, the concave-convex portion extending in at least one of the axial direction, the radial direction, and the circumferential direction of the armature core; an armature, wherein a resin layer is formed as a part of the resin between the armature core and the insulating structure;

2. The uneven portion is a groove, The armature according to claim 1 , wherein the grooves are formed in at least one of the teeth and a core back of the electric armature core.

3. 3. The armature according to claim 2, wherein the grooves are formed by stacking a plurality of types of core pieces, each having a different width at a portion that defines the slot for accommodating the coil, in the axial direction.

4. 3. The armature according to claim 2, wherein the groove extends in the axial direction and the width of the groove is gradually narrowed from an opening on the side of the slot that houses the coil toward a bottom of the groove.

5. The armature according to claim 1 , wherein the uneven portion is formed on the insulating structure.

6. A rotating electric machine comprising the armature according to any one of claims 1 to 5.

7. A method for manufacturing an armature according to any one of claims 1 to 5, comprising the steps of: a resin impregnation step of impregnating the armature core, the insulating structure, and the coil with a thermosetting resin, a part of which becomes the resin layer; and a resin heating step of passing an electric current through the coil to heat and harden the thermosetting resin.

8. A method for manufacturing a rotating electric machine, comprising: disposing a rotor facing an inner side of the stator as the armature according to claim 7 with a gap therebetween.

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