JP2017118596A - Axial air gap type rotary electric machine, and bobbin for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain coil alignment improvement and bobbin strength improvement in an axial air gap type rotary electric machine.SOLUTION: The present invention relates to an axial air gap type rotary electric machine (1) comprising a stator (2) and a rotor (30). In the stator, multiple core members (6) each including a core (8), a coil (9) wound around an outer periphery of the core and having a radius (r), and a bobbin (7) disposed between the core and the coil are arrayed in an annular shape around an axis of rotation. A face of the rotor opposes an end face of the core via a gap in a radial direction of the axis of rotation. The bobbin includes: a cylindrical part (7b) around which the coil is wound; and a flange part (7a) which extends from the vicinity of an opening in an end portion of the cylindrical part over a full outer periphery of the cylindrical part for a predetermined length in a vertical direction. The bobbin also includes a corner part (7c) of which the thickness in an extension direction of the cylindrical part becomes (r) from a position of (r) in an extension direction of the flange part from an intersection (x) between an extension in the extension direction of the flange part and an extension in an extension direction of the outer periphery of the cylindrical part along a joint source of the cylindrical part (7b) and the flange part (7a). The coil is brought into contact with the cylindrical part and a portion where the thickness becomes (r).SELECTED DRAWING: Figure 5

Description

  The present invention relates to an axial air gap type rotating electrical machine and a bobbin for a rotating electrical machine, and more particularly to an axial air gap type electric motor and a rotating electrical machine bobbin including a stator in which a coil is wound around an iron core.

  In recent years, PM (Permanent Magnet) motors have become widespread for increasing the efficiency of electric motors. Although a neodymium magnet is more efficient as a magnet, it is a rare metal (rare earth), and thus there are problems such as cost.

  As a magnet that does not use rare metals, it is common to use a ferrite magnet, but in a radial air gap type motor having an air gap in the same direction as the rotating shaft, a ferrite magnet is used along the rotating direction of the output shaft. In order to obtain the same performance as the neodymium magnet, it is necessary to increase the electric motor and the volume of the ferrite magnet. That is, there is a problem that the output and the size of the device are traded off.

  An axial air gap type motor is known as a motor that solves the relationship between the output and the size of the device. The axial air gap type motor has a feature that the thickness in the direction of the rotation axis can be reduced, that is, flattened, compared to a radial air gap type motor such as an inner rotor type.

  Patent Document 1 is a rotating electrical machine including a stator in which a coil is wound for each magnetic pole tooth such as a DC brushless motor or a stepping motor, and the shape of a winding frame of an insulating bobbin is devised to reduce the axis of the coil. Disclosed is a technique for reducing the size of a motor by shortening the bulge dimension in the direction. Specifically, an inclined corner portion is provided at a corner portion around which the coil is wound, or a projection corner portion that matches the diameter of the electric wire is provided. At this time, Patent Document 1 discloses that the shape to be formed is 2.1 times or 1.21 times the wire diameter, or a coil wire diameter or 0.87 times the coil wire diameter.

JP 2000-341896 A

  A stator of an axial air gap type rotating electrical machine is different from a general radial air gap type rotating electrical machine in that a plurality of core members are arranged in an annular shape around the rotational axis in a plane direction orthogonal to the rotational axis. It becomes a configuration (generally donut shape). The core member includes an iron core, a bobbin made of an insulating member, a coil, and the like. When arranging the core members in a ring shape, it is necessary to provide a predetermined gap between adjacent core members (particularly, between the coils) because of the requirement for insulation or the like. For this reason, when the winding of the coil is disturbed, the outermost periphery of the coil swells and a predetermined gap may not be secured.

  The performance of the rotating electrical machine depends on the coil winding amount and space factor per iron core, but since it is necessary to provide a gap between the core members, the tension of the coil wound around the bobbin outer periphery is increased, or the coil is wound after winding. If the molding is performed, a load is generated on the bobbin, which causes breakage. That is, a member that exerts stress against the force in the extending direction of the iron core that is divided in the extending direction of the iron core by the coil tension that works toward the center of the iron core (for example, the flange provided at the end of the bobbin) ) Overload.

  Although it is conceivable to increase the thickness of the entire bobbin with respect to such a load, the bobbin becomes larger and as a result, the motor becomes larger.

  Patent Document 1 is premised on a radial air gap type rotating electrical machine. Considering the application to an axial air gap type rotating electrical machine, the effective space for winding the coil is narrowed in the gap formed by the formed projection and the coil wound around the projection. The problem remains that becomes larger.

  In order to solve the above-described problems, for example, the configurations described in the claims are applied. That is, an iron core, a coil having a radius r wound around the outer periphery of the iron core, and a plurality of core members having a bobbin disposed between the iron core and the coil, and a stator arranged in an annular shape around the rotation axis, and a rotation shaft radial direction An axial air gap type rotating electrical machine having a rotor that faces the end face of the iron core through a predetermined air gap, wherein the bobbin winds the coil, and an end opening of the tubular part And having a flange extending a predetermined length in the vertical direction over the entire outer periphery of the cylindrical portion from the vicinity, along the joining source of the cylindrical portion and the flange portion, the extending direction extension line of the flange portion, From the intersection with the extension direction extension line of the outer periphery of the cylinder part, it has a corner part whose thickness is r from the position of r toward the collar part extension direction in the cylinder part extension direction, and the coil is the cylinder Part and the part where the thickness is r Is an axial air gap type rotary electric machine is intended.

  Furthermore, a bobbin for a rotating electrical machine having a cylindrical portion around which an iron core is inserted on the inner periphery and a coil having a radius r is wound on the outer periphery, An intersection of an eaves portion extending a predetermined width in the vertical direction from the tube portion, an extension line extending in the elongate direction of the tube portion, and an extension line in the elongating direction of the tube portion along a joining source of the tube portion and the eaves portion From the position of r toward the flange extending direction, the bobbin for a rotating electrical machine has a corner where the thickness in the tube extending direction is r.

According to one aspect of the present invention, the alignment of the coils is uniform, and a predetermined gap can be secured between adjacent coils. Further, the strength of the bobbin is increased, and more coils can be wound. There are effects such as improved performance of the rotating electrical machine, downsizing, and improved productivity.
Other configurations, problems, and effects of the present invention will become apparent from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional side view schematically showing the overall configuration of an axial air gap motor according to a first embodiment to which the present invention is applied. It is the longitudinal cross-sectional perspective view which showed typically the armature structure of the motor by 1st Embodiment. (A) is the top view which showed typically the stator of the motor by 1st Embodiment from the rotating shaft direction. (B) is a perspective view showing a configuration of a core member for one slot according to the first embodiment. (A) is a perspective view which shows the structure of the bobbin by 1st Embodiment. (B) is a side view of the bobbin. It is the fragmentary sectional view which expanded and showed the corner | angular part of the bobbin by 1st Embodiment. (A) is a fragmentary sectional view showing a state where a coil is wound around the bobbin according to the first embodiment. (B) is a fragmentary sectional view which shows typically the relation between the corner of the bobbin and the coil. It is a fragmentary perspective view which shows the bobbin structure of the motor by 2nd Embodiment. (A) is a fragmentary sectional view which expands and shows the corner | angular part of the bobbin by 2nd Embodiment. (B) is the elements on larger scale which show the relationship between a coil and a groove part.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a side view of a partial cross section showing the overall configuration of an axial air gap type motor 1 (hereinafter sometimes referred to as “motor 1”) that is a first embodiment to which the present invention is applied.

  The motor 1 has a substantially donut-shaped stator 2 whose outer periphery extends along the inner periphery of the housing 5 and two disk-shaped rotors 3 arranged so as to sandwich the stator 2 from the output side and the counter-output side. It has an armature configuration that faces the surface in the radial direction through a predetermined air gap. The present invention is not limited to this, and can be applied to various types such as a single rotor type and a type including a plurality of stators and a plurality of rotors.

  The rotating shaft 4 passes through the center of the stator 2 having a donut shape in a non-contact manner, is connected to the rotor 3, and the output side and the non-output side are rotatably connected to the bracket via a bearing. The bracket is mechanically connected to the substantially cylindrical housing 5. An end of the rotating shaft 4 on the side opposite to the output side is provided with an outer fan that projects from the bracket and rotates together with the rotation. The outer fan is covered with a fan cover, and cooling air generated in the direction of the rotation axis by rotation is guided to the outer peripheral surface of the housing 5 by the fan cover.

FIG. 2 is a sectional view showing a schematic configuration of the armature of the motor 1. The stator 2 is disposed near the center of the inner cylinder of the housing 5. A plurality of core members 6 described later and the inner peripheral surface of the housing 5 are integrally molded with a resin 30, and the stator 2 is supported and fixed to the housing 5. The stator 2 may be separately solidified as a strength member by resin molding or the like, and may be fixed to the motor housing 5 with bolts or the like.
The rotor 3 includes a permanent magnet 3a, a back yoke 3b, and a yoke 3c. Flat permanent magnets having a substantially sector shape with different magnetic poles are alternately arranged on one plane of a yoke 3c made of a disk-shaped metal member via back yokes 3b.

The configuration of the core member 6 will be described with reference to FIG. FIG. 3A shows a state in which the stator 2 is observed from the rotation axis direction. The stator 2 is formed by arranging 12 core members in an annular shape around the rotational axis direction. Each core member 6 functions as a 1-slot stator.
FIG. 3B shows the configuration of core members for one slot. The core member 6 includes an iron core 8, a bobbin 7 and a coil 9. The iron core 8 is a laminated iron core, and has an end face that has a substantially trapezoidal shape (including a fan shape and a shape similar thereto). The iron core 8 is formed by processing a plate-like member (including a tape) containing a magnetic material (in this example, amorphous) into a plate piece that increases in width from the axial center toward the housing. Are obtained by laminating. Note that the iron core 21 may be a dust core or a machined core, and is not limited to a laminated iron core. An iron core 8 is inserted into the bobbin 7, and a coil is wound around the outer periphery of the bobbin 7.

The configuration of the bobbin 7 will be described with reference to FIG. FIG. 4A is a perspective view of the bobbin 7. The bobbin 7 mainly includes a flange portion 7a and a cylindrical portion 7b, and a corner portion 7c is provided in the vicinity of the base between the flange portion 7a and the cylindrical portion 7b. The cylindrical portion 7 b has an inner diameter that approximately matches the outer diameter of the iron core 8 and is shorter than the length of the iron core 8. This is because the vicinity of both end faces of the iron core 8 is projected to radiate heat from the iron core 8. In addition, the structure divided | segmented by the center of the extending | stretching direction etc. may be sufficient as the cylinder part 7b.
In the vicinity of both openings of the flange portion 7b, the flange portion 7a extending a predetermined width in the extending direction and the vertical direction is disposed over the entire outer periphery of the cylindrical portion. On the other hand, the coil 9 is wound around the base of the collar portion 7a.

  FIG. 4B is a side view of the bobbin 7. A corner portion (reinforcing portion) 7c is provided over the entire circumference of the base portion of the flange portion 7a and the cylindrical portion 7a, and a predetermined gap is required between the coils 9 of the adjacent core members 6, When manufacturing a more compact motor, it is necessary to form the surface of the wound coil 9. However, when the coil 9 wound around the outermost periphery is moved, the molding load is applied to the bobbin 7. In particular, since the corner portion formed by the bobbin collar 7a orthogonal to the bobbin cylindrical outer peripheral portion 7b is broken, it is necessary to avoid excessive molding. The strength of the bobbin 7, the force at the time of molding the coil 9 (molding force), and the size of the gap between adjacent coils are in a contradictory relationship.

  If the strength of the bobbin 7 is weak and sufficient molding cannot be performed, a predetermined gap is not formed between the adjacent coils 9. On the other hand, if the surface of the coil 9 is molded to secure the predetermined gap, the bobbin 7 The risk of breakage increases. If a stronger bobbin is used, productivity and downsizing are hindered. In the present embodiment, such a problem is solved by providing the corner 7c on the bobbin 7.

The shape of the bobbin, which is one of the features of this embodiment, will be described in detail.
In FIG. 5, the enlarged view of the orthogonal part of the collar part 7a and the cylinder part 7c is shown. As shown in the figure, the flange portion 7a is arranged so as to be orthogonal to the end portion of the cylindrical portion 7b. A corner portion 7c is provided in the vicinity of a corner (joining / base) at which each straight line portion is orthogonal. The corner portion 7c is formed in the direction in which the coil 9 is wound (in the direction of the rotation axis) along the surface of the coil 9 along the surface that winds H (2r) having the same dimension as the wire diameter of the coil 9 and the same layer. It is formed with the dimension W (1 / 2r) of about half of the wire diameter. Furthermore, the corner portion 7c is rounded with a dimension R (r) that is approximately half the coil wire diameter.

  In the present embodiment, the corner portion 7c is provided along the entire circumference of the joint portion between the flange portion 7a and the cylindrical portion 7c, but may not necessarily be the entire circumference. It may be provided along. For example, the vicinity of the corner of the cylindrical portion 7a having a substantially trapezoidal shape is a portion where the coil winding tension acts particularly strongly, and the corner portion may be installed in such a portion, but the present invention is not limited thereto. It is not a thing.

FIG. 6A shows a state in which the coil 9 is wound around the bobbin 7 configured as shown in FIG.
The coil 9 is wound by aligned winding along the outer periphery of the cylindrical portion 7b from the corner portion 7c, and the first layer 9a is formed. Thereafter, the coil 9 moves to the upper layer of the first layer 9a and is wound in order in the direction opposite to that of the first layer 9a to form the second layer coil 9b. Thereafter, the third layer coil 9c and the subsequent coils are repeatedly wound up to a predetermined number of winding layers.

  FIG. 6B shows an enlarged view of the corner 7c. The corner portion 7c is a portion having a thickness of r in the extending direction of the cylinder portion 7b from the position r in the extending direction of the flange portion 7a from the intersection X of the extended line of the flange portion 7a and the extending line of the cylinder portion 7b. It contacts the first turn coil 9a1 at the first contact n). Further, the corner portion 7c is a portion having a thickness of r (2 + √3) / 2 from the position of r (2 + √3) / 2 in the extending direction of the flange portion 7a from the intersection X to the extending direction of the cylindrical portion 7b ( At the contact m), the coil 9b2 in the final turn of the second layer is contacted. That is, the corner 7c comes into contact with the coil 9 at only two points in the cross section.

  If the thickness dimension in the winding direction (rotation axis direction) of the corner portion 7c is less than half of the coil wire diameter, the final coil 9b1 of the second layer 9b is wound one before, the flange portion 7a, After the third layer coil 9c, the alignment in the vicinity of the coil 9b1 is deteriorated, and the outermost peripheral surface of the coil 9 is finally increased. On the other hand, when the thickness dimension in the winding direction (rotation axis direction) of the corner portion 7c is set to be more than half of the coil wire diameter, the coil 9b1 of the final turn of the second layer 9b and the bobbin flange portion 7a There is a possibility that a gap is formed, the alignment property in the vicinity of 9b1 after the third layer 9c is deteriorated, and the surface of the coil 9 is finally enlarged. As a result, when both core members 6 are arranged in an annular shape, a predetermined stable gap cannot be formed between adjacent coils, and a predetermined effect cannot be obtained.

  Further, in the corner portion 7c, the projecting portion H provided in the direction in which the coil is wound also has a core member 6 in an annular shape as in the projecting portion W described above, in a dimension setting that deviates from the same dimension as the coil wire diameter. When arranged in a shape, a predetermined stable gap cannot be formed between adjacent coils, and a predetermined effect cannot be obtained.

  According to this embodiment, since the corner portion 7c is formed in accordance with the wire diameter of the coil 9 wound around the bobbin 7, the strength necessary for manufacturing the core member 6 is ensured on the bobbin 7, and more A compact core member 6 can be obtained. As a result, the motor 1 is also reduced in size. In addition, the gap formed between the adjacent coils 9 is not only effective for insulation between the coils 9 but also improves the workability of being arranged in an annular shape, and further, when the stator is resin molded, It can be used as a flow channel for improving productivity and quality.

  In the first embodiment, the shape of the corner 7c is a shape whose cross section approximates a substantially trapezoidal shape, but is limited to this shape as long as the relationship between the contact point m and the contact point n described above is satisfied. It is not a thing.

[Second Embodiment]
Next, a second embodiment to which the present invention is applied will be described.
FIG. 7 is a partial cross-sectional perspective view of the bobbin 7 according to the second embodiment. In the present embodiment, a groove 10 for maintaining the alignment of the coil wound in the first layer is combined on the surface of the bobbin cylindrical outer peripheral portion 7b around which the coil is wound in the first embodiment. Is one of the characteristics. The coil of the first layer 9a wound around the cylindrical portion 7b is housed in the groove 10 and thus shifts even when receiving the load of the coil after the second layer 9b wound around the upper layer. There is no. As a result, it is possible to reduce the load applied to the corner 7c, not only prevent the bobbin 7 from being damaged, but also improve the alignment of the coil, thereby providing a more compact coil.

  8A and 8B are enlarged views of the corner portion 7c and the groove portion 10. FIG. The groove 10 includes two edge portions 10a and a bottom portion 10b. The height of the edge portion 10a is lower than the wire diameter of the coil 9, and the interval between the edge portions 10a sandwiching the bottom portion 10b is narrower than the coil diameter. The hypotenuse portion of the edge portion 10a is in contact with the coil 9 and is configured to support the coil at the bottom portion 10b. The coil 9 may not necessarily contact the bottom portion 10b, and may be configured to be supported only at two oblique sides of the edge portion 10a.

  Further, the joint (base) between the corner portion 7c and the cylindrical portion 7b is formed integrally with one edge portion 10a of the groove portion 10, and is further thickened in the rotation axis direction. The coil 9a1 of the first turn of the first layer 9a is surely supported at four points: both the oblique sides of the edge portion 10a of the groove portion 10, the bottom portion 10b, and the corner portion 7c.

  According to the present embodiment, the groove portion 10b reliably prevents misalignment in the rotation axis direction (winding direction) of the coil of each turn of the first layer 9a. As a result, the pressing force in the direction of the rotation axis applied to the corner portion 7c can be reduced, and breakage of the flange portion 7a is prevented.

  Further, the edge portion 10a of the groove portion 10a is provided so as to fill and fill the gap between the coils of adjacent turns, so that the coil alignment state can be reliably maintained without increasing the size of the entire coil 9. Exhibits sufficient stress even during coil forming.

  Further, the base portion of the corner portion 7c on the cylindrical portion 7b side is further thickened by being integrated with the edge portion 1a of the groove portion 10, and the strength of the corner portion 7c is improved.

〔Production method〕
The bobbin 7 in each of the above embodiments is formed from an insulating resin and is manufactured by resin molding. However, the present invention is not limited to this, and can be manufactured by a three-dimensional modeling machine or the like described below. That is, the bobbin 7 itself can be manufactured not only by a three-dimensional modeling machine but also by manufacturing a mold for resin molding by three-dimensional modeling with a three-dimensional modeling machine or by cutting with a cutting RP device. 7 can be obtained.

As the layered modeling, an optical modeling method, a powder sintering layered modeling method, an ink jet method, a resin dissolution lamination method, a gypsum powder method, a sheet molding method, a film transfer image lamination method, a metal stereolithography combined processing method, and the like can be applied.
The data for additive manufacturing and cutting is generated by processing 3D data generated by CAD, CG software, or a 3D scanner into NC data by CAM. Three-dimensional modeling is performed by inputting the data to a three-dimensional modeling machine or a cutting RP device. Note that NC data may be directly generated from 3D data by CAD / CAM software.

  In addition, as a method of obtaining the bobbin 22 and its resin injection mold, a data provider or servicer who created 3D data or NC data can be distributed in a predetermined file format via a communication line such as the Internet, and the user However, it is also possible to manufacture the bobbin 7 by downloading the data to a 3D modeling machine, a computer that controls the data, or accessing the data as a cloud-type service and molding and outputting the data with a three-dimensional modeling machine. It is also possible for the data provider to record 3D data or NC data on a non-volatile recording medium and provide it to the user.

  If one aspect of the bobbin 7 of this embodiment by such a manufacturing method is shown, it is a method for manufacturing a bobbin for a rotating electrical machine, in which an iron core is inserted on the inner periphery and a coil having a radius r is wound on the outer periphery. A bobbin for a rotating electrical machine having a cylindrical portion that has a flange extending a predetermined width in the vertical direction from the cylindrical portion on the entire periphery near the opening end of the cylindrical portion, and the cylindrical portion and the flange portion. Along the joining source, from the intersection of the extending direction extension line of the flange part and the extending line extension direction of the tubular part, the thickness from the position r toward the extending direction of the flange part from the position of the tubular part extending direction is It is a method of manufacturing with a three-dimensional modeling machine based on three-dimensional data of a rotating electrical machine bobbin having a corner portion r.

  Furthermore, if the other aspect of the manufacturing method of the bobbin 7 by such a manufacturing method is shown, the bobbin for rotary electric machines which has a cylinder part by which the coil of a radius r is wound by the outer periphery is inserted in an inner periphery. The three-dimensional modeling machine data is transmitted / distributed, on the entire circumference in the vicinity of the opening end of the cylindrical portion, a collar portion extending in a vertical direction from the cylindrical portion, the cylindrical portion, From the intersection of the extending direction extension line of the eaves part and the extending line of the elongate direction of the tube part along the joint of the eaves part, from the position of r toward the eaves extending direction, the extending direction of the tube part Is a method of transmitting and distributing data for a three-dimensional modeling machine of a bobbin for a rotating electrical machine having a corner portion having a thickness of r through a communication line.

  As mentioned above, although the form for implementing this invention was demonstrated, it cannot be overemphasized that this invention is not limited to the said various example, A various change is possible in the range which does not deviate from the meaning. Yes. For example, the corner portion 7c is not necessarily formed integrally with the bobbin 7. For example, when the coil 9 is wound, the coil 9 is wound after the trapezoidal annular corner portion 7c manufactured separately is attached. May be.

  In addition, the groove portion 10 of the second embodiment may be configured such that all the coils 9 of the first layer 9a are not supported by both of the two edge portions 10a sandwiching the bottom portion 10b but are in contact with a part of the top of the head. . Even in such a configuration, the groove portion 10 can be expected to have an anti-slip effect in the rotation axis direction of the coil 9. Moreover, although this embodiment gave the example applied to a motor, this invention is applicable also to a generator.

DESCRIPTION OF SYMBOLS 1 ... Axial air gap type motor (motor), 2 ... Stator, 3 ... Rotor, 4 ... Rotating shaft, 5 ... Housing, 6 ... Core member, 7 ... Bobbin, 7a ... Gutter part, 7b ... Cylindrical part, 7c ... Corner part , 8 ... laminated core (core), 9, 9a, 9b, 9c ... coil, 10 ... groove, 10a ... edge, 10b ... bottom

Claims (13)

A plurality of core members each having an iron core, a coil having a radius r wound around the outer periphery of the iron core, and a bobbin disposed between the iron core and the coil, and a stator arranged in an annular shape around the rotation axis; An axial air gap type rotating electrical machine having a rotor facing the end surface of the iron core through the air gap of
The bobbin
A cylindrical portion around which the coil is wound, and a flange extending a predetermined length in the vertical direction from the vicinity of the end opening of the cylindrical portion over the entire outer periphery of the cylindrical portion,
Along the joint between the tube portion and the flange portion,
From the intersection of the extending direction extension line of the flange part and the extending direction extension line of the outer periphery of the cylinder part toward the flange extension direction, from the position of r, the corner where the thickness in the cylinder extension direction becomes r Have
An axial air gap type rotating electrical machine in which the coil is in contact with the cylindrical portion and a portion where the thickness is r. The axial air gap type rotating electrical machine according to claim 1,
The corner portion further has a portion where the thickness from the position of r (2 + √3) / 2 from the intersecting point toward the buttock extending direction to the cylindrical portion extending direction is r (2-√3) / 2. ,
An axial air gap type rotating electrical machine in which the coil is in contact with the cylindrical portion and a portion where the thickness is r and the thickness is r (2-√3) / 2. The axial air gap type rotating electrical machine according to claim 1,
The collar portion is installed in the vicinity of both openings of the cylindrical portion,
An axial air gap type rotating electrical machine in which the corner portion is installed at a joint between the flange portion and the cylindrical portion. The axial air gap type rotating electrical machine according to claim 1,
An axial air gap type rotating electrical machine in which the corner portion has a shape having a thickness including a portion of r from the joining source toward the tube portion extending direction. The axial air gap type rotating electrical machine according to claim 1,
An axial air gap type rotating electrical machine in which the corner is provided along the entire circumference of the joining source. The axial air gap type rotating electrical machine according to claim 1,
An axial air gap type rotating electrical machine in which the corner portion is provided along a part of the joining source. The axial air gap type rotating electrical machine according to claim 1,
The cylindrical portion further has a groove portion in the winding direction of the coil, the groove portion having an edge portion having an interval smaller than the coil diameter and a height smaller than the coil radius along the winding direction of the coil. An axial air gap type rotating electrical machine. An axial air gap type rotating electrical machine according to claim 7,
An axial air gap type rotating electrical machine in which a joint portion of the corner portion with the cylindrical portion is integrated with the edge portion. An axial air gap type rotating electrical machine according to any one of claims 1 to 8,
An axial air gap type rotating electrical machine in which an inner peripheral surface of a housing that houses the plurality of core members and the stator is integrally formed by a resin mold. A bobbin for a rotating electrical machine having a cylindrical portion around which an iron core is inserted on the inner periphery and a coil having a radius r is wound on the outer periphery,
On the entire circumference in the vicinity of the opening end of the cylindrical portion, a collar portion extending a predetermined width in the vertical direction from the cylindrical portion,
From the intersection of the extending direction extension line of the flange part and the extending line of the extending direction of the cylinder part, from the position r toward the extending direction of the flange part, along the joining source of the tubular part and the flange part. A bobbin for a rotating electrical machine having a corner portion having a thickness r in a tube portion extending direction. A bobbin for a rotating electrical machine according to claim 11,
The corner portion further has a portion in which the thickness from the position of r (2 + √3) / 2 from the intersection point toward the buttock extending direction to the cylindrical portion extending direction is r (2-√3) / 2 Bobbin for rotating electrical machines. A bobbin for a rotating electrical machine according to claim 10 or 11,
The collar portion is installed in the vicinity of both openings of the cylindrical portion,
A bobbin for a rotating electrical machine in which the corner portion is installed at a joint between both flange portions and the cylindrical portion. A bobbin for a rotating electrical machine according to claim 10,
A bobbin for a rotating electrical machine in which the coil is in contact with a portion where the thickness of the cylindrical portion and the corner portion is r at the same time.

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