Armature, rotating electric macine, and armature manufacturing method

Abstract

This armature has: a plurality of armature cores (21) that are formed of a magnetic body and are disposed side by side in an annular shape; and a plurality of coils that are respectively wound around the plurality of armature cores. Each armature core has: a winding part (211) around which each coil is wound; flange parts (212) that are provided at both axial end parts of the winding part; a radially extending part (213) that extends from each flange part to the outer diameter side; and an axially extending part (214) that extends in the axial direction from the outer diameter-side end part of the radially extending part. The area of a cross section of the flange part orthogonal to the axial direction is greater than the area of a cross section of the winding part orthogonal to the axial direction.

Description

Armature, rotating electric machine, and method for manufacturing an armature

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

[0002] As a thin rotating electric machine, an axial-gap type rotating electric machine in which a disk-shaped armature and a rotor are arranged to face each other in the axial direction is known. As an armature of a conventional axial-gap type rotating electric machine, a structure is disclosed in which a support plate that holds an armature core made of a compressed powder body from both sides in the axial direction is provided, and this support plate is fixed to the frame of the armature (see, for example, Patent Document 1). Further, as another armature, an armature core made of a compressed powder body has a plurality of teeth and an annular back yoke arranged on the outer peripheral side of the teeth, and the teeth are inserted into grooves of the back yoke provided in the circumferential direction from the axial direction and fixed to the back yoke (see, for example, Patent Document 2).

[0003] Japanese Patent Publication No. 2013-537797 International Publication No. 2015 / 170518

[0004] In a conventional armature, since a support plate or a back yoke is arranged between the armature core and the rotor, there is a problem that the gap between the armature core and the rotor cannot be narrowed. Therefore, in a conventional axial-gap type rotating electric machine, there is a problem that the torque characteristics are low.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a rotating electric machine capable of narrowing the gap between an armature core and a rotor and having high torque characteristics.

[0006] The armature of the present disclosure is an armature having a plurality of armature cores made of a magnetic material and arranged in an annular shape, and a plurality of coils wound around the plurality of armature cores respectively. The armature core has a winding portion around which the coil is wound, a flange portion provided at both axial ends of the winding portion, a radially extending portion extending from the flange portion to the outer diameter side, and an axially extending portion extending axially from the outer diameter side end of the radially extending portion. The area of a cross section orthogonal to the axial direction of the flange portion is larger than the area of a cross section orthogonal to the axial direction of the winding portion.

[0007] In the armature of this disclosure, the armature core has a winding portion around which a coil is wound, flange portions provided at both axial ends of the winding portion, a radially extended portion extending outward from the flange portion, and an axially extended portion extending axially from the outer end of the radially extended portion. Since the area of ​​the cross-section of the flange portion perpendicular to the axial direction is larger than the area of ​​the cross-section of the winding portion perpendicular to the axial direction, the gap between the armature core and the rotor can be narrowed. Therefore, the torque characteristics of a rotating electric machine equipped with this armature can be improved.

[0008] This is a cross-sectional view of a rotating electric machine according to Embodiment 1. This is a perspective view of an armature core according to Embodiment 1. This is a diagram illustrating the assembly method of the armature according to Embodiment 1. This is a diagram illustrating the assembly method of the armature according to Embodiment 1. This is a perspective view of an armature core2. This is a perspective view of an armature core according to Embodiment 3. This is a perspective view of an armature core according to Embodiment 4. This is a perspective view of an armature core according to Embodiment 5.

[0009] The armature and rotating electric machine relating to embodiments for implementing this disclosure will be described in detail below with reference to the drawings. In each drawing, the same reference numerals indicate the same or corresponding parts.

[0010] Embodiment 1. Figure 1 is a cross-sectional view of a rotating electric machine according to Embodiment 1. Figure 1 is a cross-sectional view of a plane parallel to the axis of rotation. As shown in Figure 1, the rotating electric machine 100 according to this embodiment has a housing 10 consisting of a cylindrical frame 11 with a bottom and an end plate 12 that closes the opening of the frame 11, an armature 20 fixed to the inner diameter side of the frame 11, and a rotor 30 arranged with an axial gap between the armature 20 and the rotor.

[0011] The armature 20 includes a plurality of armature cores 21 made of magnetic material, a plurality of coils 22 wound around the armature cores 21, a connection plate 23 for distributing current to the plurality of coils 22, and a bobbin 24 for electrically insulating the armature cores 21, coils 22, and connection plate 23. Three connection plates 23 are provided, one for each of the three phases, and each is electrically connected to a coil 22 of a different phase. Methods such as TIG (Tungsten Inert Gas) welding, resistance brazing, laser welding, and pressure welding can be used for the electrical connection between the connection plates 23 and the coils 22. The bobbin 24 is made of an insulator such as resin. As will be described later, the armature core 21 is divided into two parts in the axial direction.

[0012] The rotor 30 has an annular yoke 31 made of a steel plate that easily conducts magnetic flux, and permanent magnets 32 arranged circumferentially on the yoke 31. A rotating shaft 40 is fastened to the center of the rotor 30. In this embodiment, the rotating electric machine 100 has two rotors 30 facing each other on both sides of the armature 20 with a gap in between in the axial direction. The rotating shaft 40 is rotatably supported by the frame 11 and end plate 12 via bearings 50. The rotor 30 rotates relative to the armature 20 around the rotating shaft 40. Here, the direction parallel to the rotating shaft 40 is called the axial direction, the direction perpendicular to the rotating shaft 40 is called the radial direction, and the direction in which the rotor 30 rotates is called the circumferential direction. The inner diameter side is the direction approaching the rotating shaft 40 in the radial direction, and the outer diameter side is the direction moving away from the rotating shaft 40 in the radial direction.

[0013] The frame 11 and armature core 21 at the position where the armature 20 is fixed are provided with through-holes 13 for circulating coolant. By circulating coolant through these through-holes 13 into the housing 10, the armature 20 and the connection plate 23 can be cooled.

[0014] The rotating electric machine 100 of this embodiment is an axial gap type rotating electric machine, in which the armature 20 is located in the axial center, and two rotors 30 are arranged opposite each other on both sides of the armature 20 in the axial direction, forming a double rotor structure. Compared to a radial gap type rotating electric machine in which the armature and rotor are arranged opposite each other in the radial direction, this axial gap type rotating electric machine can increase the area through which magnetic flux passes, and is therefore characterized by its ability to increase the power density of the rotating electric machine.

[0015] Figure 2 is a perspective view of the armature core according to this embodiment. The armature core 21 in this embodiment is divided into two parts in the axial direction, and the two divided armature cores 21a and 21b are fastened together in the axial direction. Figure 2 shows the two divided armature cores 21a and 21b separated for illustrative purposes. In this embodiment, the armature is arranged in a ring shape with multiple armature cores 21 as shown in Figure 2.

[0016] The armature core 21 of this embodiment is made of a compacted magnetic core formed by compression molding of powder such as iron. As shown in Figure 2, the armature core 21 of this embodiment is divided into two parts in the axial direction. One armature core 21a is made up of a winding portion 211 in which the coil is wound, a flange portion 212 at one end of the winding portion 211 in the axial direction having a cross-sectional area larger than the area of ​​the cross-section perpendicular to the axial direction of the winding portion 211, a radially extended portion 213 extending outward from the flange portion 212, and an axially extended portion 214 extending in the axial direction from the outer diameter end of the radially extended portion 213. In each of the two divided armature cores 21a and 21b, at least the winding portion 211 and the flange portion 212 are integrally formed. It is preferable that the two divided armature cores 21a and 21b are integrally formed, including the radially extended portion 213 and the axially extended portion 214, respectively. In this embodiment, the armature core 21 is constructed by fastening two divided armature cores 21a and 21b together at their winding portions 211. One method for fastening the two divided armature cores 21a and 21b together is to apply adhesive to the fastening surfaces of the winding portions 211 and then fasten them together.

[0017] Figure 3 is a diagram illustrating the assembly method of the armature according to this embodiment. As shown in Figure 3, when fastening the winding portions 211 of the two divided armature cores 21a and 21b together, the coil 22 is fixed around the winding portion 211. Although not shown, a bobbin is actually placed between the armature core 21 and the coil 22, and this bobbin electrically insulates the armature core 21 and the coil 22.

[0018] The coil 22 can be made by bending a flat wire in advance using a winding frame shaped to match the bobbin, or by winding a round wire on a winding frame using a nozzle winding method. In this case, the bobbin is placed around each winding portion 211 of the two pre-divided armature cores 21a and 21b, and then the coil 22 is inserted between the two pre-divided armature cores 21a and 21b. In this case, a method of directly forming the bobbin on the surface of the armature core 21 can also be adopted. Alternatively, the coil may be wound onto the bobbin in advance, and the coil integrated with the bobbin may be inserted between the two pre-divided armature cores 21a and 21b.

[0019] After inserting the coil 22 and fastening the winding portions 211 of the two divided armature cores 21a and 21b together, the axially extended portion 214 is fixed to the inner circumferential surface of the frame 11. Methods such as shrink fitting and press-fitting can be used to fix the axially extended portion 214 to the inner circumferential surface of the frame 11. In the armature of this embodiment, the armature core 21 can be directly fixed to the frame 11, so no fixing parts are required. Also, since the armature core 21 is directly fixed to the frame 11, the Joule heat generated by copper loss in the armature core 21 when current flows through the coil 22 can be directly transmitted to the frame 11 via the axially extended portion 214. Therefore, the cooling performance is improved.

[0020] In an armature configured in this way, the flanges of the armature core are exposed at both ends of the armature in the axial direction. As a result, the gap between the armature core and the rotor can be narrowed in a rotating electric machine using this armature. Therefore, the torque characteristics of a rotating electric machine equipped with this armature can be improved. Furthermore, since the area of ​​the cross-section of the flange perpendicular to the axial direction is larger than the area of ​​the cross-section of the winding perpendicular to the axial direction, the area through which the magnetic flux passes is widened, further improving the torque characteristics.

[0021] Figure 4 is a diagram illustrating the assembly method of the armature according to this embodiment. As shown in Figure 4, a fitting portion 215 may be provided on the fastening surfaces when fastening the two divided armature cores. The fitting portion 215 is composed of, for example, a combination of a projection and a groove. By providing fitting portions 215, each composed of a combination of a projection and a groove, on the fastening surfaces of the two divided armature cores 21a and 21b, and fitting the projections and grooves of each other, the two divided armature cores 21a and 21b can be firmly fastened. As a method for firmly fastening the two divided armature cores 21a and 21b, a method of integrally molding the armature core and coil with resin after they have been assembled can also be considered.

[0022] Figure 5 is a perspective view of another armature core according to this embodiment. In this armature core 21, notches 216 are provided at both circumferential ends of the flange portions 212 of the two divided armature cores 21a and 21b. When magnetic flux passes through the armature core, a magnetic short-circuit path is easily formed between armature cores arranged adjacent to each other in the circumferential direction. When a magnetic short-circuit path is formed in the circumferential direction, the axial magnetic flux linked with the rotor decreases, and the torque decreases. Figure 6 is a perspective view when the armature cores shown in Figure 5 are arranged side by side in the circumferential direction. However, only one of the two divided armature cores in the axial direction is shown. As shown in Figure 6, the notches 216 create an air gap between armature cores arranged adjacent to each other in the circumferential direction, so that a magnetic short-circuit in the circumferential direction can be suppressed. As a result, the torque characteristics are further improved in a rotating electric machine using this armature. Note that the notches 216 only need to be provided at at least one circumferential end of the flange portion 212. If the notches 216 are provided at at least one end of the flange portion 212 in the circumferential direction, gaps will be formed between the armature cores when the armature cores are arranged side by side in the circumferential direction.

[0023] Figure 7 is a perspective view of another armature core according to this embodiment. As shown in Figure 7, the notches 216 provided at the circumferential ends of the flange portions 212 of the two divided armature cores 21a and 21b may extend to the inner diameter end. Also, the notches 216 may be provided at the circumferential ends of the radially extended portions 213.

[0024] Figure 8 is a perspective view of another armature core according to this embodiment. In this armature core 21, notches 216 are provided at both ends in the circumferential direction of the flange portions 212 of the two divided armature cores 21a and 21b, and a notch 217 is provided in the circumferential center of the axially extended portion 214. When magnetic flux passes through the armature core, a magnetic short-circuit path is easily formed between the radially adjacent winding portion 211 and the axially extended portion 214. When a magnetic short-circuit path is formed in the radial direction, the axial magnetic flux linked with the rotor decreases, and the torque decreases. By providing a notch 217 in the circumferential center of the axially extended portion 214, a radial magnetic short-circuit can be suppressed.

[0025] In this embodiment, a rotating electric machine with a double rotor structure was described. The armature of this embodiment can also be applied to a rotating electric machine with a single rotor structure, in which one rotor is positioned in the axial center and armatures are positioned on either side or one side of the rotor in the axial direction with gaps in between. In the case of a rotating electric machine with a single rotor structure, the armature can be fixed to the bottom or end plate of the frame.

[0026] Embodiment 2. In the armature according to Embodiment 1, each of the multiple armature cores had one winding section. That is, one armature core had one winding section. In the armature according to Embodiment 2, one armature core has multiple winding sections.

[0027] Figure 9 is a perspective view of the armature core according to this embodiment. The armature core of this embodiment is divided into two parts in the axial direction, similar to the armature core of Embodiment 1. Figure 9 shows only one of the two parts of the armature core divided in the axial direction. As shown in Figure 9, one of the two parts of the armature core 21c divided in the axial direction is formed by connecting two armature cores shown in Figure 8 of Embodiment 1 in the circumferential direction. In the armature core of this embodiment, the notch 216 provided at the circumferential end of the flange portion 212 extends to the inner diameter end.

[0028] Armature cores of this shape are manufactured, for example, by compression molding of powder such as iron. When using a mold that opens in the axial direction for compression molding, if the axially extended portion 214 has a continuous shape, the axially extended portion 214 may lose its shape when the mold opens. In the armature core of this embodiment, a notch 217 is provided in the axially extended portion 214, so that deformation of the axially extended portion 214 can be suppressed even when using a mold that opens in the axial direction.

[0029] In an armature configured in this way, since one armature core has multiple winding sections, it is possible to reduce the number of parts and production processes. Furthermore, by insert molding the bobbin and the armature core, the process of positioning the bobbin can be eliminated. In this embodiment, an armature core with two winding sections is shown, but depending on the size of the armature core, the number of winding sections, etc., one armature core may have three or more winding sections.

[0030] Embodiment 3. In the armature according to Embodiment 1, the armature core was divided into two axial sections at approximately the center of the winding section in the axial direction. That is, each of the two axially divided armature cores had both a winding section and a flange section. In the armature according to Embodiment 3, the axial division position of the armature core is changed to the position of one end of the winding section in the axial direction. That is, in this embodiment, one of the two axially divided armature cores has both a winding section and a flange section, while the other armature core has only a flange section.

[0031] Figure 10 is a perspective view of the armature core according to this embodiment. The armature core 21 of this embodiment is composed of armature cores 21d and 21e, which are divided axially at one end of the winding portion 211. The two divided armature cores 21d and 21e of this embodiment are fastened together in the axial direction. Figure 10 shows the two divided armature cores 21d and 21e separated for illustrative purposes. One armature core 21d is composed of a winding portion 211, a flange portion 212, a radially extended portion 213, and an axially extended portion 214. The other armature core 21e is composed only of a flange portion 212 and a radially extended portion 213. A groove 218 is formed in the flange portion 212 of the other armature core 21e into which the winding portion 211 of the other armature core 21d is fitted. In this embodiment, the armature core 21 is fastened by fitting the winding portion 211 of one armature core 21d into the groove 218 of the other armature core 21e. The winding portion 211 of one armature core 21d and the groove 218 of the other armature core 21e are fastened together by adhesive, press-fitting, or the like.

[0032] In this embodiment, the armature can be assembled by first placing the bobbin and coil on the winding portion 211 of one armature core 21d, and then fitting the winding portion 211 of one armature core 21d into the groove 218 of the other armature core 21e. At this time, since the winding portion 211 is not divided into two, the positioning of the bobbin and coil becomes easier. In addition, since the coils can be wired before fastening the two axially divided armature cores together, work efficiency is improved.

[0033] Furthermore, by combining armature cores 21d, each composed of a winding section, a flange section, a radially extended section, and an axially extended section, it is possible to construct an armature core with a longer axial length. As a result, the number of armature types can be increased.

[0034] Furthermore, the division points of the armature core may be set at both ends in the axial direction of the winding portion, and the armature core may be divided into three parts in the axial direction. For example, the armature core may consist of a first armature core having only a winding portion and two second armature cores having a flange portion and a radially extended portion, and at least one of the two second armature cores may have an axially extended portion.

[0035] A method for manufacturing an armature when such an armature core is divided into three parts in the axial direction will be described. First, one of the second armature cores is arranged in a ring shape. Next, the first armature cores are fastened to each of the second armature cores arranged in a ring shape. Next, coils are wound around the winding portion of each of the first armature cores. Finally, the other second armature core is fastened to each of the first armature cores.

[0036] The armature core configured in this way can easily accommodate changes in armature model simply by changing the axial length of the first armature core, which consists only of the winding section.

[0037] Embodiment 4. In the armature according to Embodiment 1, the armature core is provided with an axially extended portion extending axially from the outer diameter end of the radially extended portion, and the armature core was fixed to the inner circumferential surface of the frame by this axially extended portion. The armature core according to Embodiment 4 does not have an axially extended portion, and the armature core is fixed to the inner circumferential surface of the frame by the radially extended portion.

[0038] Figure 11 is a perspective view of the armature core according to this embodiment. The armature core 21 of this embodiment is composed of armature cores 21f and 21g, which are divided axially at one end of the winding portion 211. The two divided armature cores 21f and 21g of this embodiment are fastened together in the axial direction. Figure 11 shows the two divided armature cores 21f and 21g separated for illustrative purposes. The two divided armature cores 21f and 21g are each composed of a winding portion 211, a flange portion 212, and a radially extended portion 213. In each of the two divided armature cores 21f and 21g, at least the winding portion 211 and the flange portion 212 are integrally formed. It is preferable that the two divided armature cores 21f and 21g are integrally formed, including the radially extended portion 213. The flange portion 212 and the radially extended portion 213 have an axial thickness of 2 mm or more, and the armature core 21 is fixed to the inner circumferential surface of the frame by the radially extended portion 213. The outer diameter side surface of the radially extended portion 213 and the inner circumferential surface of the frame are fastened together by methods such as shrink fitting or adhesive bonding.

[0039] In the armature configured in this way, an axial extension portion is unnecessary compared to the armature shown in Embodiment 1, thus simplifying the structure of the mold used when manufacturing the armature core by compression molding of powder such as iron. As a result, productivity is improved.

[0040] In addition, in the armature core of this embodiment, as shown in Figure 5 of the armature of Embodiment 1, notches may be provided at both ends in the circumferential direction of the flange portion 212 of the two divided armature cores 21f and 21g. Since the notches create an air gap between armature cores that are arranged adjacent to each other in the circumferential direction, circumferential magnetic short circuits can be suppressed.

[0041] Embodiment 5. Figure 12 is a perspective view of the armature core according to Embodiment 5. The armature core 21 of this embodiment is composed of two divided armature cores 21h and 21k. The armature core 21 of this embodiment is fastened together with the two divided armature cores 21h and 21k. Figure 12 shows the two divided armature cores 21h and 21k separated for illustrative purposes.

[0042] As shown in FIG. 12, one armature core 21h of the two-divided armature core is composed of a winding portion 211, a flange portion 212, and a radially extending portion 213. A cavity portion 219 is formed inside the winding portion 211 of this armature core 21h. The other armature core 21k is composed of an insertion portion 220, a flange portion 212, and a radially extending portion 213. The insertion portion 220 of this armature core 21k is configured to be inserted into the cavity portion 219 of the winding portion 211 of one armature core 21h. The armature core 21 is formed by inserting the insertion portion 220 into the cavity portion 219 of the winding portion 211, thereby fastening the armature core 21h and the armature core 21k. The cavity portion 219 of the winding portion 211 and the insertion portion 220 are fastened by methods such as shrink fitting and adhesion. Similar to the armature of Embodiment 4, the armature of the present embodiment is fixed to the inner peripheral surface of the frame by the radially extending portion 213.

[0043] In the armature configured as described above, since the two-divided armature cores are fastened in the circumferential direction rather than in the axial direction, the magnetic resistance in the axial direction decreases. As a result, the magnetic characteristics of the armature are improved.

[0044] In the armature core of the present embodiment shown in FIG. 12, although the cavity portion 219 of one armature core 21h penetrates in the axial direction, it is not necessary for the cavity portion 219 to necessarily penetrate as long as there is a space into which the insertion portion 220 of the other armature core 21k can be inserted.

[0045] Although various exemplary embodiments and examples are described in the present disclosure, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a specific embodiment, but can be applied to embodiments alone or in various combinations. Therefore, countless variations not illustrated are envisioned within the scope of the technology disclosed in this specification. For example, it includes cases where at least one component is modified, added, or omitted, and further, cases where at least one component is extracted and combined with components of other embodiments.

[0046] 10 Housing, 11 Frame, 12 End plate, 13 Through hole, 20 Armature, 21, 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h, 21k Armature core, 22 Coil, 23 Connection plate, 24 Bobbin, 30 Rotor, 31 Yoke, 32 Permanent magnet, 40 Rotating shaft, 50 Bearing, 211 Winding section, 212 Flange section, 213 Radial extension section, 214 Axial extension section, 215 Fitting section, 216, 217 Notch section, 218 Groove, 219 Cavity section, 220 Insertion section, 100 Rotating electric machine.

Claims

1. An armature comprising a plurality of armature cores made of a magnetic material and arranged in a ring shape, and a plurality of coils wound around each of the plurality of armature cores, wherein the armature core has a winding portion around which the coils are wound, flange portions provided at both ends of the winding portion in the axial direction, a radially extended portion extending outward from the flange portion, and an axially extended portion extending in the axial direction from the outer diameter end of the radially extended portion, wherein the area of ​​the cross-section of the flange portion perpendicular to the axial direction is larger than the area of ​​the cross-section of the winding portion perpendicular to the axial direction.

2. The armature according to claim 1, characterized in that a notch is provided at the circumferential end of the flange portion.

3. The armature according to claim 1 or 2, characterized in that a notch is provided in the axially extended portion.

4. The armature according to any one of claims 1 to 3, characterized in that the plurality of armature cores are composed of compacted magnetic cores formed by compression molding of magnetic powder.

5. The armature according to any one of claims 1 to 4, characterized in that the winding portion and the flange portion are integrally formed.

6. The armature according to any one of claims 1 to 4, wherein each of the multiple armature cores is composed of a first armature core and a second armature core that are each divided into two in the axial direction, the first armature core having the winding portion, the flange portion and the radially extended portion, the second armature core having at least the flange portion and the radially extended portion, and at least one of the first armature core and the second armature core having the axially extended portion.

7. The armature according to claim 6, characterized in that the first armature core and the second armature core are fastened together with an adhesive.

8. The armature according to claim 6 or 7, characterized in that a fitting portion is formed on the fastening surface between the first armature core and the second armature core.

9. The armature according to any one of claims 1 to 4, wherein each of the multiple armature cores is composed of a first armature core having only the winding portion and two second armature cores having the flange portion and the radially extended portion, and at least one of the two second armature cores has the axially extended portion.

10. An armature comprising a plurality of armature cores made of a magnetic material and arranged in a ring shape, and a plurality of coils wound around each of the plurality of armature cores, wherein the armature core has a winding portion around which the coils are wound, flange portions provided at both ends of the winding portion in the axial direction, and radially extended portions extending outward from the flange portions, wherein the area of ​​the cross-section of the flange portion perpendicular to the axial direction is larger than the area of ​​the cross-section of the winding portion perpendicular to the axial direction.

11. The armature according to claim 10, characterized in that a notch is provided at the circumferential end of the flange portion.

12. The armature according to claim 10 or 11, characterized in that the winding portion and the flange portion are integrally formed.

13. The armature according to claim 10 or 11, wherein each of the multiple armature cores is composed of a first armature core and a second armature core, each divided into two parts in the axial direction, the first armature core having the winding portion, the flange portion and the radially extended portion, and the second armature core having at least the flange portion and the radially extended portion.

14. The armature according to claim 13, characterized in that the first armature core has a cavity inside the winding portion, and the second armature core further comprises an insertion portion that is inserted into the cavity of the first armature core.

15. The armature according to any one of claims 1 to 14, characterized in that the armature core and the coil are fixed by integral molding of resin.

16. A rotating electric machine having an armature according to any one of claims 1 to 9, a rotor disposed axially with a gap between it and the armature, and a cylindrical housing in which the armature is fixed, wherein the axial extension portion is fastened to the inner surface of the housing and the armature is fixed inside the housing.

17. A rotating electric machine having an armature according to any one of claims 10 to 15, a rotor disposed axially with a gap between it and the armature, and a cylindrical housing in which the armature is fixed, characterized in that the radially extended portion is fastened to the inner surface of the housing and the armature is fixed inside the housing.

18. A method for manufacturing an armature according to any one of claims 6 to 8 and 13 to 14, comprising the steps of: arranging a plurality of first armature cores in an annular shape; winding a plurality of coils around the winding portions of the plurality of first armature cores; and fastening a plurality of second armature cores to the plurality of first armature cores.

19. A method for manufacturing an armature according to claim 9, comprising the steps of: arranging one of the second armature cores in an annular shape; fastening the first armature cores to the second armature cores arranged in an annular shape; winding the coils around the winding portion of the first armature core; and fastening the other second armature core to the first armature core.

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