WO2017141412A1

WO2017141412A1 - Axial gap rotary electric machine

Info

Publication number: WO2017141412A1
Application number: PCT/JP2016/054774
Authority: WO
Inventors: 恭永米岡; 利文鈴木; 高橋　秀一; 博洋床井
Original assignee: 株式会社日立産機システム
Priority date: 2016-02-19
Filing date: 2016-02-19
Publication date: 2017-08-24
Also published as: JPWO2017141412A1

Abstract

In order to improve operability and productivity in an axial gap rotary electric machine and ensure the gap length between the stator and rotors, this axial gap rotary electric machine has a stator, which has magnetic flux end surfaces in the direction of a rotary shaft and is formed by arranging multiple core members in a circular arrangement centered on the rotary shaft and not in contact with the rotary shaft, and rotors the surfaces of which oppose the magnetic flux end surfaces in the direction of the rotary shaft, and the rotary shaft rotates together with the rotors. In addition, this axial gap rotary electric machine has bearings having one-side wheels, which are arranged between the stator and the rotor on the rotary shaft, and which contact the rotary-shaft-side end surface of the stator end surface opposing the rotor, other-side wheels, which are arranged between the stator and the rotor on the rotary shaft, and which contact the rotor end surface opposing the stator, and rolling bodies, which contact the axial-direction opposing surfaces of the one-side wheels and the other-side wheels, and the other-side wheels rotate in conjunction with the rotation of the rotary shaft.

Description

Axial gap rotating electric machine

The present invention relates to an axial gap rotating electrical machine, and more particularly to an axial gap rotating electrical machine in which a bearing is disposed between a stator and a rotor.

In an axial gap rotating electrical machine in which the stator and the rotor face each other in the axial direction with a predetermined gap in the axial direction, the gap management between the stator and the rotor is important from the viewpoint of performance and reliability.

Patent Document 1 discloses a gap length holding method for an axial gap rotating machine. More specifically, the stator, two rotors arranged so as to sandwich the stator from both sides in the axial direction, a rotating shaft that rotates together with the rotor, and thermal expansion in the axial direction of the stator are managed. A free side armature plate (first plate) and a fixed side armature plate (second plate) are provided at both ends of the stator in the axial direction, and the end of the rotating shaft on the fixed side armature plate side is a thrust bearing. The structure is such that it is axially supported on the frame and the end on the free armature plate side is axially supported on the frame by a radial bearing (cylindrical roller bearing). Accordingly, the armature core is positioned, and the armature core and the rotor are provided by providing the fixed-side bearing on the second plate side where the variation in the distance from the rotor is relatively smaller than the first plate side. The structure which stabilizes the position (specifically distance between axial gap surfaces) is disclosed.

JP 2012-152019 A

However, in Patent Document 1, the one that holds the gap (gap length) between the stator and the rotor is only absorption of the load by the fixed-side bearing. Therefore, considering the difference in the axial thermal expansion of the stator and the axial movement difference of the two rotors due to the thermal expansion of the rotating shaft, precise and complex machining accuracy and assembly accuracy are required, which improves workability and productivity. There are challenges. In particular, there is no mechanical or structural shield between the stator and the rotor, and there remains a problem in reliability of securing a gap.

In this respect, gap management can be facilitated by inserting a metal or resin spacer between the stator and the rotor to secure the gap, but the spacer is inserted between the rotor and the fixed object. Therefore, there is a possibility that the gap length varies due to wear and heat generation and loss due to friction occur.
A technique capable of improving workability and productivity and managing the gap with high accuracy is desired.

In order to solve the above problems, for example, the configuration described in the claims is applied. That is, a stator having a magnetic flux end surface in the direction of the rotation axis, and a plurality of core members arranged in an annular shape in contact with the rotation shaft around the rotation axis, and a rotor facing the magnetic flux end surface in the direction of the rotation axis. An axial gap rotating electrical machine in which the rotating shaft rotates together with the rotor, and is disposed between the stator of the rotating shaft and the rotor, and the end surface on the rotational axis side of the stator end surface facing the rotor A rotating body that is in contact with the axially facing surfaces of the one side wheel that contacts the stator, the other side wheel that contacts the rotor end surface facing the stator, and the one side wheel and the other side wheel. And having a bearing that rotates the other wheel as the rotating shaft rotates.

According to one aspect of the present invention, gap management, workability, and productivity of an axial gap rotating electrical machine are improved. In addition, the reliability and performance of securing the gap between the stator and the rotor can be maintained.
Other problems, configurations, and effects of the present invention will become apparent from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view schematically showing a structure of an electronic machine for an axial gap rotating electrical machine according to a first embodiment to which the present invention is applied. It is a schematic diagram which shows the example of a process which applies mold resin to the stator of the axial gap rotary electric machine by Example 1. FIG. 3 is a partial cross-sectional view in the rotation axis direction of the axial gap rotating electrical machine according to the first embodiment. FIG. 3 is an enlarged schematic diagram of a configuration example in the vicinity of a thrust bearing of the axial gap rotating electrical machine according to the first embodiment. It is a schematic diagram which shows the example of the cap dimension measurement location by a comparative example. 4 is a schematic diagram illustrating an example of a gap dimension measurement location according to Example 1. FIG. It is a partial cross-sectional view of the axial direction of the axial gap rotating electrical machine according to the second embodiment to which the present invention is applied. It is a rotation direction fragmentary sectional view of the axial gap rotary electric machine by Example 3 to which this invention is applied.

Hereinafter, modes for carrying out the invention will be described with reference to the drawings.

FIG. 1 schematically shows an armature configuration of an axial gap rotating electrical machine 1A according to a first embodiment to which the present invention is applied. The axial gap rotating electrical machine 1A includes a stator 100 that mainly generates a rotating magnetic flux in the axial direction, and two rotors 200 that are disposed so as to sandwich the stator 100 from the axial direction. In this embodiment, a 1-stator / 2-rotor configuration is applied, but the present invention is not limited to this, and there is at least one such as 1-stator / 1-rotor, 2-stator / 1-rotor, 2-stator-3-rotor, etc. The present invention can be applied to a configuration including a stator and one rotor. Further, it may be an electric motor or a generator.

The stator 100 is formed by arranging a plurality of core members 140 in an annular shape around the rotation axis. The core member 140 includes a columnar core 110, a bobbin 120 that insulates the radial outer periphery of the column, and a coil 130. The core 110 is an iron core obtained by various methods such as cutting, powder compaction, or laminating plate-like pieces. In this embodiment, a core made of a laminate of foil strips made of amorphous metal is applied. For example, the core 110 is laminated with foil strips that gradually increase in width in the rotational direction from the axial center side toward the radially outer side. As another example, the width in the radial direction may be changed and the foil strips may be stacked in the rotational direction. The core 110 is exemplified as a column having a substantially trapezoidal cross-sectional shape, but various configurations in which the cross-section has a circular shape, another rectangular shape, or a different cross-sectional shape in the axial direction can also be applied.

The bobbin 100 is made of an insulating material such as resin, has an inner cylinder having a size that roughly matches the outer diameter shape of the core 110 in the radial direction, and covers the outer periphery of the outer diameter. The bobbin 100 may be configured to be divided in the axial direction or the radial direction, or another insulator (application of insulating paper or an insulating agent) may be applied instead of the bobbin 100.
A coil 130 made of copper or aluminum is wound around an outer cylinder on the back side of the inner cylinder of the bobbin 100.

The coils 130 of the adjacent core members 140 are arranged in a non-contact manner in consideration of insulation in the plurality of core members 140 arranged in an annular shape around the rotation axis. In this embodiment, a mold resin for covering and fixing the core members 140 is provided, and the stator 100 is fixed in the housing 300 by the mold resin.

FIG. 2 is a side sectional view schematically showing an example of the molding resin process. The housing 300 is a housing having an inner cylindrical space that encloses part or all of the stator 100, the rotor 200, the rotating shaft 201, and the like. Each core member 140 is placed on the outer periphery of a cylindrical inner diameter mold 510 in which a lower mold 500 substantially matching the inner cylinder diameter of the housing 300 is inserted from one opening and a through shaft through which the rotation shaft penetrates the stator 100 is formed. Deploy. Thereafter, an upper mold (not shown) having the same diameter as the lower mold is inserted from the other opening of the housing 300. For each core member 140 surrounded by the housing 300, the mold lower mold 500, the inner diameter mold 510, and the mold upper mold, resin is sealed from the outside in the axial direction of the mold, and between each core member 140 and part or all of the axial end surface. A mold resin 104 is formed along an annular shape. In other words, the stator 100 has an annular mold resin on the outer periphery.

At the same time, the stator 100 is fixed in the housing by enclosing the resin between each core member 140 and the inner peripheral wall of the housing 300. Further, in this embodiment, the housing 300 has one or a plurality of through holes 310 at the outer peripheral position facing the radial direction of the core member 140, and the stator 100 is fixed inside the housing by the mold resin that enters the through holes 310. It comes to secure. The position of the through hole 310 is preferably a position in which part or all of the through hole 310 overlaps any one of the regions extending in the radial direction by the axial width of the molded resin. Moreover, the through-hole 310 can be used also as an outlet of a leader line, and there may be a plurality of through-holes 310.

The fixing of the core members 140 is not limited to the mold resin. For example, the outer peripheral ends of the adjacent core members 140 are connected to each other by a plate-like member or a fitting, or the ring is integrally connected by a ring. It may be configured to be fixed with screws, bolts, pins or the like from the outer cylinder side or the inner cylinder side of 300. Alternatively, another mold resin may be applied to the annularly arranged core member 140, and then placed in the housing 300 and fixed with a bolt or the like, and various methods can be applied.

1, the rotor 200 includes a magnet 220 made of various magnetic materials such as ferrite and neodymium, and a yoke 210 that supports the magnet 220 from the outside in the axial direction. The magnet 220 is formed by annularly arranging a plurality of fan-shaped magnet pieces with the rotation axis as the center. The poles of adjacent magnet pieces are arranged in different directions in the axial direction.

The yoke 210 is an annular member made of metal or the like, has a flat surface that substantially matches the annular shape of the magnet 220, and supports one axial surface of the magnet 220. In addition, along the inner ring and outer ring shapes of the magnet 220, support walls having a thickness that is the same as or different from the thickness of the magnet 220 are provided on the outer periphery of the magnet 220 to further support the radial circumferential surface of the magnet 220. The yoke 210 and the magnet 220 may be fixed with an adhesive. Further, the yoke 210 has a through hole 205 in the center on the shaft center side, and fixes the rotor 200 and the rotary shaft 201 by press-fitting or engagement by unevenness.

FIG. 3 shows a partial cross section in the axial direction of the axial gap rotating electrical machine 1A. The housing 300 is connected to the

brackets

400a and 400b at both axial openings.

Radial bearings

202a and 202b are arranged in the center of the

brackets

400a and 400b, and the rotary shaft 201 is rotatably supported.

The center of the stator 100 having the mold resin 104 has a shaft through hole 107 in the axial direction, and the rotating shaft 201 penetrates without contact. The present embodiment is characterized in that a bearing having an equivalent or strong (advantageous) axial stress resistance compared to the radial direction is disposed in the vicinity of both axial openings of the axial through hole 107. A thrust bearing, an angular bearing, a conical roller bearing, or the like can be applied as a bearing having a relatively high stress resistance in the axial direction. In this embodiment, the

thrust bearings

240a and 240b are described.

FIG. 4 shows an enlarged view around the thrust bearing 240. In the case of one thrust bearing 240b, the stator-side ring 241b comes into contact with the mold resin end face in the predetermined width-diameter direction from the opening end of the shaft through hole 107. The stator-side ring 241b, which is a ring on one side of the thrust bearing, is formed on the contact surface with the mold resin, for example, a notch or irregularity that engages in the stress, adhesive, or rotational direction of the bearing or rotor press-fitted into the rotating shaft. Etc., and the rotation is limited. Further, as shown in FIG. 4A, the inner diameter of the stator side wheel 241 b on the axial center side is larger than the outer diameter of the rotating shaft 201 and is preferably not in contact with the rotating shaft 201. As another example, as shown in FIG. 4 (b), the rotation shaft 201 can also realize a non-contact state by reducing the diameter of the portion facing the stator side wheel 241b in the axial direction. .

On the other hand, the rotor-side ring 242b, which is the other-side ring of the thrust bearing 240, comes into contact with the surface near the root of the rotation axis of the rotor yoke 210b via an annular spacer 230b made of metal or resin. The contact surfaces in the axial direction of the rotor-side ring 242b of the rotor yoke 210b, the spacer 230b, and the thrust bearing 240b are fixed by, for example, stress for press-fitting, adhesive, or notches or irregularities that engage in the rotational direction. Further, the inner diameter on the shaft center side of the wheel on the shaft end side is substantially the same as the outer diameter of the rotating shaft 201, and is fixed in contact with the rotating shaft 201. If positioning is possible, the shaft center side inner diameter of the wheel on the shaft end side may be larger than the outer diameter of the rotating shaft and may be non-contact.

The axial thicknesses of the

thrust bearings

240a and 240b and the

spacers

230a and 230b are in contact with the axial base surfaces of the yoke 210a and the yoke 210b, and the axial end surfaces of the stator 100 and the stators of the

magnets

220a and 220b. The gap in the axial direction can be secured by determining the dimensions in advance so that a predetermined gap is formed between the opposite surfaces. The error of each member can also be adjusted by increasing the number of spacers 230 or not attaching them at all.

In the present embodiment, the axial thickness of the spacers 230a and 230b is preferably smaller than the axial thickness of the thrust bearing 240 or the axial thickness of any one of the rings. There is no limitation, and the axial thickness may be equal to or greater than these. Further, as shown by a dotted line in FIG. 4B, the position where the spacer is attached is not only between the yoke 210 and the rotor-side ring 242b, but also between the stator-side ring 241 and the stator 100 (spacer 242c) or It can also be installed in both of them.

According to the present embodiment, by installing the thrust bearing 240 (and the spacer 230 as necessary) between the stator 100 and the rotor 200, the gap length between the stator and the rotor can be secured and the performance can be maintained. . Even if the fixed state between the rotor 200 and the rotating shaft 201 is loosened due to secular change or the like and the rotor 200 is slightly displaced in the axial direction, the thrust bearing 240 or the like restricts the movement to the stator 100 side, and the magnet Maintenance of the magnetic flux surface such as the surface and the stator end surface can be reliably performed. The same effect can be expected when the housing fixing state of the stator 100 is loosened.

Further, according to the present embodiment, since the thrust bearings 240 are provided on both sides in the axial direction across the stator 100, the one thrust bearing 240 restricts the movement of the rotor 200 and the like toward the stator 100 and the other The thrust bearing 240 prevents the rotor 200 and the like from separating from the stator 100 side, and ensures that the predetermined gap length is maintained.

Also, in order to secure the gap between the stator and the rotor, there is no friction loss as in the case of installing only the spacer, and the performance can be secured. Furthermore, since at least the stator-side ring 241 of the thrust bearing 230 is not in contact with the rotating shaft 201, there is no friction loss between the bearing ring and the rotating shaft due to rotation.

Furthermore, in this embodiment, since the axial width of the thrust bearing 240 and the like is defined in advance, it can be expected that the gap can be easily secured even on the assembly surface. Further, since the gap length can be adjusted by increasing / decreasing the spacer 230, the gap length can be easily changed only by adjusting the error of the member or by increasing / decreasing the spacer 230. Below, the point which becomes easy for such gap adjustment and assembly property is demonstrated using FIG.5 and FIG.6.

FIG. 5 shows the configuration of a comparative example in which the

thrust bearings

240a and 240b are not used, unlike the axial gap rotating electrical machine 1A of the first embodiment shown in FIG. Since it is difficult to measure the gap length between the stator and the rotor after assembly, it is necessary to measure the dimensions of each part and calculate the gap length before assembly.

As shown in FIG. 5, when the gap length is ensured without installing the thrust bearing 240, the total eight dimensions [A] to [H] are measured, and the assembled gap length is calculated. As a result, assembly is performed so that a desired gap length is obtained. In the case of this method, the measurement and calculation steps are increased, and furthermore, high accuracy is required for assembling each member.
In addition, in order to limit the movement of the rotary shaft 201 and the like in the axial direction, it is also necessary to provide a bearing fixing plate 410 and the like that limit at least the movement of the outer ring of the radial bearing 202a toward the rotor 200 and the like.

On the other hand, as shown in FIG. 6, when the

thrust bearings

240a and 240b are used, since the bearing is inserted between the rotor and the stator, the gap length can be surely ensured. Also, if the bearing has high dimensional accuracy (generally high accuracy), only two points [G] and [H] are necessary for measuring the thickness of the spacer to obtain the desired gap length. Become. Thereby, a man-hour can be reduced and reliability can also be improved. Further, since the thrust bearing 240 receives an axial load (axial load), the bearing fixing plate 410 and the like are not required. Thus, according to the present embodiment, the adjustment of the gap length and the assembly process are also simplified.

Next, an axial gap rotating electrical machine 1B according to a second embodiment to which the present invention is applied will be described. In the following description, members having the same functions as those of the first embodiment are denoted by the same reference numerals, and detailed description may be omitted.
In FIG. 7, the axial direction fragmentary sectional view of the axial gap rotary electric machine 1B is shown. The main differences from the first embodiment are that the rotor 200 is a single stator / one rotor type and that the stator 110 has a stator back yoke 111 on the end surface on the side opposite to the rotor of the core 110. In the case of the 1-stator / 1-rotor type, since the magnetic flux surface of the stator 100 is opposed to the rotor 200 mainly in one axial direction, a back yoke (relay) is formed on the opposite side in the axial direction, and the magnetic flux It is designed to increase the density efficiency.

In this embodiment, as in the first embodiment, the gap length can be secured by inserting the thrust bearing 240 between the mold resin 104 near the shaft through hole 107 of the stator 100 and the rotor 200. In addition, only [J] is a dimension measurement place necessary to obtain a desired gap length. That is, the horizontal width between the axial extension line of the magnet 220 facing the stator 100 and the axial extension line of the surface of the thrust bearing 240 facing the rotor-side ring 242 is measured. By managing the thickness of the spacer 230 based on the above, the gap can be easily adjusted.

Next, an axial gap rotating electrical machine 1C according to a third embodiment to which the present invention is applied will be described. In the following description, members having the same functions as those of the first or second embodiment are denoted by the same reference numerals, and detailed description may be omitted.
FIG. 8 is a partial sectional view in the axial direction of the axial gap rotating electrical machine 1C. The main difference from the other embodiments is that there is one rotor 200 and the stator 100 is a so-called two-stator / one-rotor type. One of the stators 100 is fixed to the housing 300 by the mold resin 104 as in the other embodiments, and the other is resin-molded separately, and then inserted into the housing 300 and fixed by bolts, engaging portions or adhesives. It is a point that has come to do.

The two stators 100A and 100B have the stator back

yokes

111a and 111b on the end surfaces of the

cores

110a and 110b on the opposite side of the rotor 200 and the axially facing surface, as in the second embodiment.

The axial end surfaces of the stator-side rings 241 a and 241 b of the

thrust bearings

240 a and 240 b are in contact with the portion of the mold resin 104 in the vicinity of the opening of the shaft through hole 107 of both the stators 100, and are not in contact with the rotating shaft 201. On the other hand, the axial end surfaces of the rotor-

side rings

242a and 242b are in contact with the yoke 210 via the

spacers

230a and 230b and are not in contact with or in contact with the rotating shaft 201 (see FIG. 4).

Even in the case of the third embodiment, the gap between the stator and the rotor can be secured easily by managing the

spacers

230a and 230b based on the dimension measurement of [L] and [K]. be able to.

As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the said various example, A various deformation | transformation is possible in the range which does not deviate from the meaning. For example, a part or all of the above-described embodiments can be replaced with other embodiments, or a part of the configuration can be omitted.

For example, in the above embodiment, an example of a stator having a mold resin that integrally covers the core members has been described. However, the present invention is not limited to this, and the core members can be made of metal or the like without using the mold resin. The present invention can also be applied to a stator having a configuration in which each core member 140 is exposed in a ring shape by a connecting member. In this case, it is preferable to secure and maintain the strength of the contact portion through an annular contact plate member made of metal, a silica material, resin, rubber, or the like at a portion that contacts the stator-side ring 241 of the thrust bearing. Furthermore, it is preferable to ensure sufficient insulation (insulating material, structural separation, etc.) between the stator-side ring 241 of the thrust bearing and the core 110 and the coil 130.

Moreover, in the said Example, although the structural example which assembles the rotor 200 and the rotating shaft 201 in the state in which the stator 100 was being fixed to the housing 300 was demonstrated, this invention is not limited to this, The stator 100, rotor The present invention can also be applied to the case where 200 and the rotary shaft 201 are assembled first, and then installed in a desired casing, housing, or frame, and similar effects can be expected.

1A, 1B, 1C: Axial gap rotating electrical machine, 100: Stator, 107: Shaft through hole, 110, 110a, 100b ... Stator core, 111, 111a, 111b ... Stator back yoke, 120 ... Bobbin, 130 / 130a / 130b ... Coil , 140: core member, 200: rotor, 201: rotating shaft, 202 / 202a / 202b ... radial bearing, 210 / 210a / 210b ... rotor yoke, 220 / 220a / 220b ... magnet, 230 / 230a / 230b ... spacer, 240 / 240a 240b:

Thrust bearings

241, 241a, 241b: Stator side wheel, 242, 242a, 242b, 242c ... Rotor side wheel, 300: Housing, 301: Through hole, 400, 400a, 400b ... End bracket, 410 ... axis Fixed plate, 500 ... lower mold, 510 ... inner diameter type, A ... distance between load side radial bearing insertion end surface and housing load side end surface, B ... distance between housing load side end surface and load side resin end surface, C ... housing anti-load The distance between the side end surface and the anti-load side resin end surface, D: Distance between both end surfaces of the housing, E: Distance between the shaft load side radial bearing butting portion and the shaft load side rotor yoke butting portion, F: Shaft load side radial bearing Distance between the abutting part and the shaft counter load side rotor yoke abutting part, G: Distance between the load side rotor yoke facing surface and the load side magnet facing surface, H: Distance between the anti load side rotor yoke facing surface and the anti load side magnet facing surface , J: Distance between rotor yoke facing surface and magnet facing surface, K: Distance between rotor yoke load side facing surface and magnet load side facing surface, L: Rotor yo The distance between the click counter-load-side opposing face-magnet non-load-side opposing face

Claims

A stator having a magnetic flux end surface in the direction of the rotation axis, and a plurality of core members arranged in an annular shape without contact with the rotation shaft around the rotation axis, and a rotor facing the magnetic flux end surface in the direction of the rotation axis. And an axial gap rotating electrical machine in which the rotating shaft rotates together with the rotor,
Arranged between the stator and the rotor of the rotating shaft;
A ring on one side in contact with the end surface on the rotation axis side of the stator end surface facing the rotor;
A ring on the other side in contact with the rotor end surface facing the stator;
A rotating body that abuts against the opposing surfaces in the axial direction of the one side wheel and the other side wheel;
An axial gap rotating electrical machine having a bearing that rotates the other wheel as the rotating shaft rotates.
The axial gap rotating electrical machine according to claim 1,
An axial gap rotating electrical machine further comprising a housing having an inner cylindrical space for fixing the stator on a radially outer peripheral side of the stator.
The axial gap rotating electrical machine according to claim 2,
An axial gap rotating electrical machine in which the housing includes the rotor and the bearing in the inner space.
An axial gap rotating electrical machine according to claim 2 or 3,
An axial gap rotating electrical machine in which the inner cylinder space fixes the stator via screws, bolts, or pins.
The axial gap rotating electrical machine according to claim 1,
Covering a part or all of the outer periphery of the plurality of core members, further comprising a mold resin that annularly covers the stator along an arrangement around the rotation axis,
An axial gap rotating electrical machine in which one ring of the bearing is in contact with the end surface on the rotation axis side of the stator end surface through the mold resin.
The axial gap rotating electrical machine according to claim 4,
An axial gap rotating electrical machine further comprising a housing having an inner cylindrical space for fixing the stator on a radially outer peripheral side of the stator.
The axial gap rotating electrical machine according to claim 4,
An axial gap rotating electrical machine in which the inner cylindrical space is fixed by the mold resin.
The axial gap rotating electrical machine according to claim 1,
An axial gap rotating electrical machine in which the other wheel contacts the rotor end face via at least one spacer.
The axial gap rotating electrical machine according to claim 1,
An axial gap rotating electrical machine in which the ring on the one side is in contact with the end face of the stator via at least one spacer.
An axial gap rotating electrical machine according to claim 8 or 9,
An axial gap rotating electrical machine in which the thickness of the spacer in the rotation axis direction is smaller than the thickness of the bearing in the rotation axis direction.
An axial gap rotating electrical machine according to claim 8 or 9,
An axial gap rotating electrical machine in which a thickness of the spacer in the rotation axis direction is smaller than a thickness of the one wheel or the other wheel in the rotation axis direction.
The axial gap rotating electrical machine according to claim 1,
An axial gap rotating electrical machine, wherein the bearing is a thrust bearing, a conical roller bearing, or an angular bearing.