Axial gap motor

Abstract

To provide an axial gap motor capable of achieving a high output.SOLUTION: An axial gap motor 100 includes: a rotor 150 in which a plate-shaped magnet holder 153 that holds a plurality of magnets 158 in a state of being disposed in an annular shape is provided to protrude in a flange shape around a rotatable rotor shaft 151; and a stator core 113 in which a plurality of winding 120, 140 for generating a magnetic field are disposed in an annular shape at a position facing the magnets 158 via a gap. The magnet holder 153 is formed of a carbon fiber reinforced plastic that is an insulator. The magnet holder 153 is composed of a first holder half body 154 having a first magnet holding portion 156 that holds the magnet 158 and a second holder half body 155 having a second magnet holding portion 157 that holds the magnet 158. The first magnet holding portion 156 and the second magnet holding portion 157 are formed at positions shifted in a circumferential direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an axial gap motor in which a magnetic gap is formed in the direction of the rotation axis of a rotor relative to a stator, and magnetic flux passes in the direction of the rotation axis. [Background technology]

[0002] Conventionally, there has been an axial gap motor in which a magnetic gap is formed in the axial direction of the rotor relative to the stator, and magnetic flux passes in the axial direction. For example, the following Patent Document 1 discloses an axial gap motor in which a winding coil unit is arranged for each magnet arranged on both sides of a disk constituting a rotor, and a front housing and a rear housing that house these two winding coil units are directly connected via bolts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-175338 A

[0004] However, in the axial gap motor described in Patent Document 1 above, the gap between the magnet in the rotor and the wound coil unit is determined by the positions of the mating surfaces of the front and rear housings, so each of the mating surfaces of the front and rear housings must be molded with extremely high precision, resulting in a large manufacturing and maintenance burden.

[0005] The present invention has been made to address the above problems, and an object of the present invention is to provide an axial gap motor that can reduce the manufacturing and maintenance burdens. Summary of the Invention

[0006] In order to achieve the above-mentioned object, the feature of the present invention is an axial gap motor comprising a rotor in which a magnet holder arranged in a circular ring shape with multiple magnets exposed on both sides of a plate-shaped body is provided to protrude like a flange around a rotatable rotor shaft, two sets of stators in which multiple electromagnets are arranged in a circular ring shape on both sides of the magnet holder in positions facing the magnets with a gap between them, and two housings formed in a concave shape with openings facing both sides of the magnet holder and accommodating each of the two sets of stators, and the two housings are integrally connected via an annular center plate arranged radially outside the magnet holder.

[0007] According to the features of the present invention configured in this manner, in the axial gap motor, the two housings are integrally connected via the annular center plate, so the gap between the magnet on the rotor side and the electromagnet on the stator side can be defined by manufacturing only the center plate with high precision, thereby reducing the manufacturing burden of the axial gap motor. In this case, the gap between the magnet on the rotor side and the electromagnet on the stator side can be easily changed by replacing the center plate, reducing the manufacturing and maintenance burden of the axial gap motor.

[0008] Another feature of the present invention is that in the axial gap motor, the center plate has a connecting portion for mounting the axial gap motor to an object to which the axial gap motor is to be mounted.

[0009] According to this, the axial gap motor can be attached to an object via a connecting portion formed on the center plate for attaching the axial gap motor to the object. Also, since the axial gap motor is attached to the object via the center plate, at least one of the two housings can be removed while the axial gap motor is attached to the object, and maintenance work can be performed on the axial gap motor.

[0010] Another feature of the present invention is that in the axial gap motor, the center plate is formed to protrude radially outward from the magnet holder relative to the two housings.

[0011] According to this, since the axial gap motor has a center plate that protrudes radially outward from the magnet holder relative to the two housings, heat inside the axial gap motor can be efficiently dissipated via the center plate.

[0012] Another feature of the present invention is that in the axial gap motor, the center plate has a jacket formed thereon that is recessed or penetrates in the axial direction of the rotor shaft along the circumferential direction of the center plate.

[0013] According to this, the axial gap motor has a jacket formed on the center plate that is recessed or penetrated in the axial direction of the rotor shaft along the circumferential direction of the center plate, so that the surface area of ​​the center plate can be increased and the heat inside the axial gap motor can be efficiently dissipated. In this case, the jacket may be formed so as to be exposed to the outside at a position on the radial outside of the two housings, or may be formed at a position inside the two housings. The jacket may also be filled with a coolant such as water.

[0014] Another feature of the present invention is that in the axial gap motor, the center plate has convex or concave positioning portions that fit into the two housings, respectively.

[0015] According to this, the axial gap motor has convex or concave positioning portions on the center plate that fit respectively into the two housings, so that the two housings can be easily positioned and attached to the center plate, facilitating assembly work.

[0016] Another feature of the present invention is that in the axial gap motor, stator cores constituting the electromagnets in the two sets of stators are in direct contact with the two housings, respectively.

[0017] According to this, in the axial gap motor, the stator cores constituting the electromagnets in the two stators are in direct contact with the two housings, respectively, so that the heat of the stator cores can be efficiently dissipated to the outside.

[0018] Moreover, the axial gap motor can also be configured as follows in order to reduce the amount of heat generated.

[0019] For example, an axial gap motor is an axial gap motor that includes a rotor in which a plate-shaped magnet holder that holds multiple magnets in a circular ring-shaped arrangement is arranged in a flange-like manner around a rotatable rotor shaft, a stator in which multiple electromagnets with windings arranged around a core are arranged in a circular ring-shaped arrangement in a position facing the magnets across a gap, a housing that houses the rotor in a rotatable state and the stator in a fixed state, and a core holder that fixes the core to the housing, and the core holder can be attached to the housing to fix the outer periphery of the core to the housing.

[0020] Also, for example, an axial gap motor is an axial gap motor that includes a rotor in which a plate-shaped magnet holder that holds multiple magnets in a circular ring-shaped arrangement is arranged in a flange-like manner around a rotatable rotor shaft, and a stator in which multiple windings for generating a magnetic field are arranged in a circular ring-shaped manner in a position facing the magnets across a gap, and the windings can be formed hollow.

[0021] Also, for example, an axial gap motor is an axial gap motor that includes a rotor in which a plate-shaped magnet holder that holds multiple magnets in a circular ring-shaped arrangement is arranged in a flange-like manner around a rotatable rotor shaft, and a stator in which multiple windings for generating a magnetic field are arranged in a circular ring-shaped manner in a position facing the magnets with a gap between them, and the magnet holder can be made of an insulator. [Brief description of the drawings]

[0022] [Figure 1] 1 is a cross-sectional view showing an outline of the internal configuration of an axial gap motor according to an embodiment of the present invention. [Diagram 2] 2 is a partially enlarged cross-sectional view of the axial gap motor shown in FIG. 1, in which a first stator half, a second stator half, and a center plate are mainly designated by reference numerals. [Diagram 3] 2 is a partially enlarged cross-sectional view of the axial gap motor shown in FIG. 1, in which a stator core, a core holder, and a winding are mainly designated by reference numerals. FIG. [Figure 4] 2 is a partially enlarged cross-sectional view of the axial gap motor shown in FIG. 1, with reference numbers assigned to the rotor at the center. [Diagram 5] 2 is a perspective view showing a schematic external configuration of the stator core shown in FIG. 1. [Figure 6] 2 is an exploded perspective view showing a schematic external configuration of the core holder shown in FIG. 1. [Figure 7] 2 is a perspective view showing a schematic external configuration of a winding assembly that constitutes the winding shown in FIG. 1. [Figure 8] 2 is an exploded perspective view showing a schematic external configuration of the rotor shown in FIG. 1. [Figure 9] 2 is a perspective view showing a state in which magnets are omitted from the rotor shown in FIG. 1. [Figure 10] FIG. 2 is a perspective view showing a schematic external configuration of the center plate shown in FIG. [Figure 11] 8 is a flowchart showing a manufacturing process of the winding shown in FIG. 7. [Figure 12]FIG. 2 is a cross-sectional view for explaining the process of forming the winding shown in FIG. 1 using a winding forming die, and is a schematic diagram showing a state in which a pipe material is set in a die plate that constitutes the winding forming die. [Figure 13] FIG. 2 is a cross-sectional view for explaining the process of forming the winding shown in FIG. 1 using a winding forming die, and is a schematic diagram showing the state in which a pipe material set in a die plate is pressed with a punch to form it. [Figure 14] 2 is a perspective view showing a state in which a core holder is disposed in a housing at the bottom of the first stator half shown in FIG. 1. FIG. [Figure 15] 15 is a perspective view showing a state in which a winding and a stator core are respectively arranged in the first stator half shown in FIG. 14. FIG. [Figure 16] 15 is a perspective view showing a state in which a center plate is disposed in the first stator half shown in FIG. 14. FIG. [Figure 17] 17 is a perspective view showing an axial gap motor in which a second stator half is disposed via a center plate on the first stator half shown in FIG. 16 and integrated with the first stator half, the perspective view being viewed from the first stator half side in an upside-down state. [Figure 18] 2 is an explanatory diagram showing a schematic diagram of the state of a magnetic circuit formed between the windings, the stator core, and the magnets shown in FIG. 1, in relation to a perspective view of the rotor. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of an axial gap motor according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an outline of the internal configuration of an axial gap motor 100 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view in which the first stator half 110, the second stator half 130, and the center plate 160 in the axial gap motor 100 shown in FIG. 1 are mainly labeled with reference numbers. FIG. 3 is a cross-sectional view in which the stator cores 113, 133, the core holders 115, 135, and the windings 120, 140 in the axial gap motor 100 shown in FIG. 1 are mainly labeled with reference numbers. FIG. 4 is a cross-sectional view in which the rotor 150 in the axial gap motor 100 shown in FIG. 1 is mainly labeled with reference numbers.

[0024] (Configuration of the axial gap motor 100) The axial gap motor 100 is an electric motor configured to have a magnetic gap S in the direction of the rotation axis of the rotor 150 relative to the stator core 113, and magnetic flux passes in the direction of the rotation axis. In this embodiment, the axial gap motor 100 is used as a prime mover that drives a propeller in a drone (unmanned aerial vehicle) or a manned aerial vehicle. The axial gap motor 100 is mainly configured to include a first stator half 110, a second stator half 130, a rotor 150, and a center plate 160.

[0025] The first stator half 110 and the second stator half 130 are components that constitute two stators in the axial gap motor 100. The first stator half 110 and the second stator half 130 are disposed opposite each other via the rotor 150, and are formed symmetrically with respect to each other via the rotor 150. For this reason, only the first stator half 110 will be described, and the second stator half 130 will be assigned a reference number corresponding to the first stator half 110 and its description will be omitted. The first stator half 110 includes a housing 111.

[0026] The housing 111 is a component that accommodates the stator core 113, the magnet facing portion 113a, and the windings 120, and is formed in a generally cylindrical shape with a bottom. In this case, a rotor through-hole 111a is formed in the center of the housing 111, through which the rotor shaft 151 of the rotor 150 passes, and the rotor shaft 151 is rotatably supported in the rotor through-hole 111a via a bearing 111b (such as a ball bearing or a conical bearing). In addition, a through-hole 111c is formed in the bottom of the housing 111, through which a bolt 116c for attaching a core holder 115 (described later) passes.

[0027] Further, a positioning portion 111d is formed at the opening of the housing 111. The positioning portion 111d is a portion that fits into a positioning portion 162 of the center plate 160 described later to position the housing 111 with respect to the center plate 160. In this case, the positioning portion 111d not only determines the radial position of the housing 111, but also determines the gap S between the magnet facing portion 133a of the stator core 113 and the magnet 158. The positioning portion 111d is formed in a shape that protrudes in an annular shape along the opening of the housing 111.

[0028] A connecting portion 111e is formed radially outwardly of the positioning portion 111d of the housing 111, protruding outwardly in the radial direction at intervals along the circumferential direction. A through hole is formed in the connecting portion 111e, through which a bolt 112a for attaching the second stator half 130 via the center plate 160 passes. In this case, the bolt 112a is fastened with a nut 112b to connect the first stator half 110 and the second stator half 130. The housing 111 is made of a metal material (e.g., aluminum material) or a resin material (e.g., CFRP).

[0029] Stator core 113 is a component that forms a magnetic circuit together with windings 120 to increase the density of the magnetic flux generated by windings 120, and is made of a magnetic material. Specifically, stator core 113 is formed by laminating powder magnetic cores or electromagnetic steel sheets (silicon steel sheets). As shown in Fig. 5, this stator core 113 is configured such that one tooth 113b is formed on one magnet facing portion 113a.

[0030] The magnet facing portion 113a is a portion for guiding the magnetic flux generated by the winding 120 to the magnet 158 ​​by facing the magnet 158 ​​held by the rotor 150 described later, and is configured as a fan-shaped plate in a plan view. The magnet facing portion 113a is formed by projecting from the outer periphery of the teeth 113b in a flange shape, and is formed to have an area larger than the cross-sectional area of ​​the teeth 113b in a plan view. In this case, the magnet facing portion 113a is formed to have an area smaller than the facing surface of the magnet 158 ​​facing the magnet facing portion 113a. The magnet facing portion 113a may be formed to have the same size as the facing surface of the magnet 158 ​​facing the magnet facing portion 113a, or an area larger than the facing surface.

[0031] The teeth 113b are portions for guiding the magnetic flux generated by the winding 120 to the magnet facing portion 113a, and are formed in a triangular prism shape extending in a direction perpendicular to the plate surface of the magnet facing portion 113a. In this embodiment, one tooth 113b is formed for each magnet facing portion 113a, but two or more teeth 113b may be formed for each magnet facing portion 113a. Core side fitting portions 114a, 114b are formed on the inner and outer circumferential portions of the teeth 113b along the circumferential direction, respectively. Note that the teeth 113b may be formed in a shape other than a triangular prism shape, such as a square prism shape or a cylindrical shape, as long as they are formed to extend in the axial direction of the winding 120.

[0032] The core side fitting portions 114a and 114b are portions into which a core holder 115 for fixing the stator core 113 in the housing 111 fits. Specifically, the core side fitting portion 114a is formed as a concave groove in the inner circumferential surface of the end portion of the tooth 113b opposite the magnet facing portion 113a. The core side fitting portion 114b is formed as a concave groove in the outer circumferential surface of the end portion of the tooth 113b opposite the magnet facing portion 113a.

[0033] The stator cores 113 are arranged in an annular shape on the radially outer side of the rotor shaft 151 in direct contact with the bottom of the housing 111. In this embodiment, twelve stator cores 113 are arranged in an annular shape on the radially outer side of the rotor shaft 151 at the bottom of the housing 111, but the number of stator cores 113 to be arranged is determined appropriately depending on the specifications of the axial gap motor 100.

[0034] Core holder 115 is a component for fixing stator core 113 to the bottom of housing 111, and is made of a non-magnetic metal material (e.g., aluminum material) or a resin material (e.g., CFRP), etc. This core holder 115 is mainly composed of two inner fixing members 116, two outer fixing members 117, and twelve stoppers 118, as shown in Fig. 6.

[0035] The inner fixing member 116 is a component for fixing the inner circumferential surfaces of the teeth 113b to the bottom of the housing 111, and is formed in a plate shape extending in an arc along the inner circumferential surfaces of the teeth 113b. In this embodiment, the inner fixing member 116 is formed in a semicircular arc along the inner circumferential surfaces of six teeth 113b, which is half of the twelve teeth 113b arranged in an annular shape.

[0036] That is, the inner fixing member 116 is formed in a semicircular arc shape to fix the inner circumferential surfaces of six teeth 113b, which is half of the twelve teeth 113b arranged in a circular ring, to the bottom of the housing 111. As a result, the inner circumferential surfaces of the twelve teeth 113b arranged in a circular ring are fixed to the bottom of the housing 111 by the two inner fixing members 116 formed in a semicircular arc shape. Fixed member side fitting portions 116a are formed in the arc portions of these two inner fixing members 116 that protrude outward in a convex manner.

[0037] The fixed member side fitting portion 116a is a portion for fitting into the core side fitting portion 114a formed on the inner surface of the tooth 113b, and is configured as a protrusion that protrudes in a convex shape from the outer arc portion of the inner fixed member 116. Also, a mounting through hole 116b is formed in the plate surface of each inner fixed member 116.

[0038] The mounting through-holes 116b are female threaded holes into which bolts 116c are threadedly fitted to fix the inner fixing member 116 to the bottom of the housing 111. In this embodiment, two mounting through-holes 116b are formed on the plate surface of the inner fixing member 116.

[0039] The outer fixing member 117 is a component for fixing the outer peripheral surface side of the teeth 113b to the bottom of the housing 111, and is formed in a plate shape extending in an arc along the outer peripheral surface of the teeth 113b. In this embodiment, the outer fixing member 117 is formed in a semicircular arc along the outer peripheral surfaces of six teeth 113b, which is half of the twelve teeth 113b arranged in an annular shape.

[0040] That is, outer fixing member 117 is formed in a semicircular arc shape to fix the outer peripheral surfaces of six teeth 113b, which is half of the twelve teeth 113b arranged in a circular ring, to the bottom of housing 111. In this way, outer fixing member 117 fixes the outer peripheral surfaces of the twelve teeth 113b arranged in a circular ring to the bottom of housing 111 by two outer fixing members 117 formed in a semicircular arc shape. Fixed member side fitting portion 117a is formed in each of the inwardly recessed arc portions of these two outer fixing members 117.

[0041] Fixed member side fitting portion 117a is a portion for fitting into core side fitting portion 114b formed on the outer surface of tooth 113b, and is configured as a protrusion protruding in a convex shape from the inner arc portion of outer fixed member 117. Also, mounting through-holes 117b are formed in the plate surface of each outer fixed member 117.

[0042] The mounting through-holes 117b are female threaded holes into which bolts 117c for fixing the outer fixing member 117 to the bottom of the housing 111 are screwed. In this embodiment, three mounting through-holes 117b are formed on the plate surface of the outer fixing member 117.

[0043] Stopper 118 is a component for preventing circumferential positional deviation of twelve teeth 113b arranged in an annular shape on the bottom of housing 111, and is composed of a plate-like body extending linearly in the radial direction of housing 111. Fixed member side fitting portions 118a are formed on both ends of stopper 118.

[0044] Fixed member side fitting portion 118a is a portion for fixing to the bottom of housing 111, and is formed into a shape into which fixed member side fitting portions 116a, 117a of inner fixed member 116 and outer fixed member 117 fit. That is, fixed member side fitting portion 118a is formed into a groove shape recessed into which fixed member side fitting portions 116a, 117a fit.

[0045] The winding 120 is a component that generates a magnetic flux when current is applied to form a magnetic circuit together with the stator core 113, and is made of a conductive metal material (for example, aluminum or copper). In this embodiment, the winding 120 is configured by winding a hollow aluminum pipe in a circular shape, and is wound around each of the twelve teeth 113b in a concentrated winding manner.

[0046] In this case, the windings 120 are formed by connecting the windings 120 of every four teeth 113b positioned at equal intervals on the 12 teeth 113b arranged in a ring shape with one conductor. That is, as shown in Fig. 7, the windings 120 are formed of three identical winding associations 121a, 121b, and 121c in which the four windings 120 are connected together via a connecting member 120a made of a conductor.

[0047] These winding assemblies 121a, 121b, 121c are all wound in the same direction to form the coils of the U-phase, V-phase, and W-phase of the three-phase AC coil, and are arranged in sequence in the circumferential direction of the U-phase, V-phase, and W-phase. A manufacturing method of the winding 120 will be described later. The stator core 113 and the winding 120 correspond to the stator according to the present invention.

[0048] The second stator half 130 is configured in the same manner as the first stator half 110. That is, the second stator half 130 is configured similarly to the first stator half 110, except that the housing 111, the rotor penetrating portion 111a, the bearing 111b, the through hole 111c, the positioning portion 111d, the connecting portion 111e, the stator core 113, the magnet facing portion 113a, the teeth 113b, the core side fitting portions 114a, 114b, the core holder 115, the inner fixing member 116, the fixing member side fitting portion 116a, the mounting through hole 116b, the bolt 116c, the outer fixing member 117, the fixing member side fitting portion 117a, the mounting through hole 117b, the bolt 117c, the stopper 118, the fixing member side fitting portion 118a, the winding 120 (winding association 121a, 121b, 121c) and the winding 120 (winding association 121a, 121b, 121c) are the same as those in the first stator half 110. 1, a housing 131, a rotor penetrating portion 131a, a bearing 131b, a through hole 131c, a positioning portion 131d, a connecting portion 131e, a stator core 133, a magnet facing portion 133a, teeth 133b, core side fitting portions 134a, 134b, a core holder 135, an inner fixing member 136, a fixing member side fitting portion 136a, a mounting through hole 136b, a bolt 136c, an outer fixing member 137, a fixing member side fitting portion 137a, a mounting through hole 137b, a bolt 137c, a stopper 138, a fixing member side fitting portion 138a, and a winding 140 (winding associations 141a, 141b, 141c and a connecting member 140a).

[0049] As shown in FIG. 8, rotor 150 is a component that is rotated relative to first stator half 110 and second stator half 130, and is mainly constituted by rotor shaft 151, magnet holder 153, and clamping body 159.

[0050] The rotor shaft 151 is a component that constitutes an output shaft of the axial gap motor 100 by being driven to rotate, and is configured by forming a metal material (for example, aluminum material or steel material) into a rod shape. This rotor shaft 151 is formed with a flange portion 151a that protrudes radially outward to hold the magnet holder 153 by sandwiching it with the clamping body 159. In this case, the flange portion 151a is formed with six through holes 151b aligned in the circumferential direction, through which the bolts 152 that screw into the clamping body 159 pass. In this embodiment, the flange portion 151a is integrally formed by machining the same material as the rotor shaft 151.

[0051] The magnet holder 153 is a part for holding the magnet 158, and is made of an insulating resin material. In this embodiment, it is made of prepreg (CFRP) in which carbon fibers are oriented in one direction and impregnated with resin. In this case, the prepreg is made by laminating chopped sheets made by cutting UD tape to a predetermined length. This magnet holder 153 is made of a first holder half 154 and a second holder half 155.

[0052] The first holder half 154 and the second holder half 155 are components for holding the magnet 158 ​​facing the stator core 113 of the first stator half 110 and the magnet 158 ​​facing the stator core 133 of the second stator half 130 at positions offset from each other in the rotational drive direction of the rotor 150. Specifically, the first holder half 154 and the second holder half 155 are each formed with shaft through holes 154a, 155a through which the rotor shaft 151 passes at the center of the disk body, and also formed with attachment holes 154b, 155b, a first magnet holding portion 156, and a second magnet holding portion 157 radially outward from the shaft through holes 154a, 155a, respectively.

[0053] The mounting holes 154b, 155b are through holes through which the bolts 152 that screw into the clamping body 159 pass, and six through holes are formed lined up along the circumferential direction. In this case, the mounting holes 154b formed in the first holder half 154 and the mounting holes 155b formed in the second holder half 155 are respectively formed at positions where they communicate with each other in a state where the first magnet holding portion 156 and the second magnet holding portion 157 described later are positioned at positions shifted from each other in the circumferential direction.

[0054] As shown in FIG. 9, the first magnet holding portion 156 and the second magnet holding portion 157 are portions that hold the magnet 158, and are formed in a shape that allows the magnet 158 ​​to fit therein. In this embodiment, the first magnet holding portion 156 and the second magnet holding portion 157 are configured as fan-shaped through holes that expand radially outward. That is, the first magnet holding portion 156 and the second magnet holding portion 157 are formed in an annular shape that surrounds the entire circumference of the magnet 158. In this case, the first magnet holding portion 156 and the second magnet holding portion 157 are formed in a wide shape that is longer than the circumferential length of the magnet facing portions 113a and 133a of the stator cores 113 and 133.

[0055] The first holder half 154 and the second holder half 155 are integrated by bonding their plate surfaces together with an adhesive. In this case, the first holder half 154 and the second holder half 155 are bonded together at positions offset from each other in the circumferential direction while maintaining a state in which the first magnet holding portion 156 and the second magnet holding portion 157 are in communication with each other, compared to a state in which the first magnet holding portion 156 and the second magnet holding portion 157 are arranged facing each other at exactly the same position in the circumferential direction.

[0056] As a result, first magnet holding portion 156 has a communicating portion 156a communicating with second magnet holding portion 157 formed in one part, and a non-communicating portion 156b blocked by second holder half 155 formed in the other part. Second magnet holding portion 157 has a communicating portion 157a communicating with first magnet holding portion 156 formed in one part, and a non-communicating portion 157b blocked by first holder half 154 formed in the other part. First holder half 154 and second holder half 155 may be integrated by a method other than adhesion, for example, welding or bolt fastening, or may be indirectly integrated by the magnetic force of magnet 158 ​​without using these adhesion, welding, or bolt fastening.

[0057] Magnet 158 ​​is a component for generating a magnetic force for each of stator cores 113, 133, and is made of a permanent magnet. In this embodiment, magnet 158 ​​is made of a bonded magnet formed into a fan-shaped plate in a plan view, but magnets other than bonded magnets, such as various magnets such as neodymium magnets, ferrite, samarium cobalt, or alnico, can be used.

[0058] This magnet 158 ​​is fitted into first magnet holding portion 156 and second magnet holding portion 157, respectively. In this case, first magnet holding portion 156 and second magnet holding portion 157, which face each other, face each other in a state of partial communication with each other via communication portion 156a and communication portion 157a, respectively. The two magnets 158 fitted into first magnet holding portion 156 and second magnet holding portion 157, which face each other, are fitted into first magnet holding portion 156 and second magnet holding portion 157, respectively, with opposite poles facing each other.

[0059] As a result, between the first magnet holding portion 156 and the second magnet holding portion 157 facing each other, parts of the two magnets 158 are in close contact with each other via the communicating portion 156a and the communicating portion 157a, respectively, and the other parts are in close contact with the non-communicating portion 156b or the non-communicating portion 157b. As a result, the two magnets 158 held between the first magnet holding portion 156 and the second magnet holding portion 157 facing each other are strongly in close contact with each other via the magnetic force via the communicating portions 156a and 157a and are substantially integrated, and are prevented from falling off (dislodging) from the first magnet holding portion 156 and the second magnet holding portion 157 by the non-communicating portions 156b and 157b. In this case, the magnets 158 may be attached to the first magnet holding portion 156 and the second magnet holding portion 157 by the adhesive force of an adhesive in addition to the magnetic force.

[0060] The clamping body 159 is a component for attaching the magnet holder 153 to the rotor shaft 151, and is configured by forming a metal material (for example, aluminum or steel) into a flat ring shape. This clamping body 159 has a shaft through hole 159a formed in the center of the disk body through which the rotor shaft 151 passes, and six female screw holes 159b into which the bolts 152 are screwed are formed lined up in the circumferential direction on the radial outside of this shaft through hole 159a.

[0061] The center plate 160 is a component that is interposed between the first stator half 110 and the second stator half 130 to define the gaps S between the stator core 113 of the first stator half 110 and the stator core 133 of the second stator half 130 and the magnets 158 held by the rotor 150, and is made of a metal material, a resin material, or the like. In this embodiment, the center plate 160 is made of an aluminum material, which is a metal material with high thermal conductivity. As shown in FIG. 10, the center plate 160 mainly includes an interposed portion 161 and a connecting portion 165.

[0062] The interposed portion 161 is a portion interposed between the housing 111 of the first stator half 110 and the housing 131 of the second stator half 130, and is formed in an annular shape. The interposed portion 161 mainly includes a positioning portion 162 and an extension portion 163.

[0063] Positioning portion 162 is a portion into which positioning portion 111d of housing 111 and positioning portion 131d of housing 131 are fitted, and is configured with annular flat surfaces recessed in a concave shape one step lower than extension portion 163 on each inner portion on both sides of intermediate portion 161. The thickness of positioning portion 162 determines the interval (distance) between magnet facing portion 113a of first stator half 110 and magnet facing portion 133a of second stator half 130. This also means that the interval (gap S) of stator core 113 and stator core 133 relative to magnet 158 ​​is determined.

[0064] The extension portion 163 is a portion that enhances the heat dissipation property of the inside of the axial gap motor 100, and is formed in an annular shape formed radially outward of the positioning portion 162. In this embodiment, the extension portion 163 is formed so as to protrude radially outward from each cylindrical outer periphery of the housings 111, 131 and the connecting portion 111e, 131e and to be exposed to the outside. The extension portion 163 is formed with a through hole 163a and a jacket 164. The through hole 163a is a through hole through which the bolt 112a that integrally connects the first stator half 110 and the second stator half 130 passes.

[0065] The jacket 164 is a portion for increasing the surface area of ​​the extension portion 163 to increase the area exposed to air, and is configured by intermittently forming grooves extending in a concave shape along the circumferential direction on one plate surface on both sides of the extension portion 163. In this embodiment, eight jackets 164 are formed on the radial outside of the housings 111, 131 in a state exposed to the outside.

[0066] The connecting portion 165 is a portion for mounting the axial gap motor 100 to an object to which the axial gap motor 100 is to be mounted, and is formed to extend radially outward from the intermediate portion 161 in a rectangular shape in a plan view. The connecting portion 165 has four through holes through which bolts (not shown) for mounting the axial gap motor 100 to an object to which the axial gap motor 100 is to be mounted pass. In this embodiment, the connecting portion 165 is mounted to a wirelessly controlled flying object (a so-called drone) (not shown). More specifically, the connecting portion 165 is connected to the tip of an arm extending radially from the center of the drone to support a plurality of propellers of the drone.

[0067] (Manufacturing process of the axial gap motor 100) Next, a manufacturing process for the axial gap motor 100 configured as above will be described. First, before describing the manufacturing process for the axial gap motor 100, a manufacturing process for the winding 120 will be described with reference to Fig. 11. Note that the manufacturing process for the winding 140 is the same as the manufacturing process for the winding 120, and therefore a description thereof will be omitted.

[0068] 12 and 13, the winding 120 is formed by a winding forming die M made of die steel. Specifically, the winding forming die M is configured to include a die plate M1 having a ring-shaped female forming portion SK that is recessed in the same shape as the winding 120 when viewed from above and into which the material is set, and a convex male punch M2 that enters the forming portion SK and compression-forms the material in the forming portion SK. The winding forming die M is then attached to a press device (not shown).

[0069] Specifically, in a first step, an operator sets a pipe material P made of the material for the winding in a forming portion SK on a die plate M1 of a winding forming die M (see FIG. 12). In this case, the operator winds the pipe material P around a teeth model die (not shown) that has the same cross-sectional shape as the teeth 113b but is thicker than the teeth 113b to form a coil shape, and inserts the semi-finished product of the winding 120 into the forming portion on the die plate M1 of the winding forming die M. In this case, an insulating paint is applied to the outer surface of the semi-finished product of the winding 120.

[0070] Next, in the second step, the worker forms the winding assembly 121a. Specifically, the worker operates the press device to cause the punch M2 to enter the forming section SK of the die plate M1 (see FIG. 13). As a result, the pipe material P in the forming section SK is crushed in the direction of entry of the punch M2 with deformation restricted by the forming section SK. In this case, the press device crushes the pipe material P with an entry amount such that the hollows in the pipe material P are not completely crushed and remain as hollows. As a result, the pipe material P in the forming section SK is deformed from a circular cross-sectional shape to a substantially rectangular shape, and adjacent pipe materials P in the direction of entry of the punch M2 come into close contact with each other to form the winding 120.

[0071] Next, in the third step, the worker removes the winding 120 from the winding forming die M. Specifically, the worker operates the press device to insert the ejector pin E into the forming section SK, thereby removing the winding 120 from within the forming section. In this case, adjacent pipe materials in the winding 120 in the direction in which the punch M2 enters (the axial direction of the winding 120) are insulated from each other by the insulating coating.

[0072] Next, in the fourth step, the worker produces winding assemblies 121a, 121b, and 121c. Specifically, the worker electrically connects the three formed windings 120 into a single piece via connecting member 120a. In this case, the worker can connect connecting member 120a, which is made of the same aluminum material as windings 120, to windings 120 by welding. In this way, the worker can produce windings 120. Windings 140 can also be produced in a similar manner.

[0073] The connecting member 120a may be made of a conductive material different from that of the winding 120. The connecting member 120a may be made of a hollow pipe material like the winding 120, or may be made of a solid material. The connecting member 120a may be formed in a plate shape or a wire shape.

[0074] In addition, the winding assembly 121a can ensure insulation between adjacent pipe materials P by a method other than the insulating coating. For example, in the pressing process of the semi-finished product of the winding assembly 121a, the worker can ensure insulation between the pipes by pressing with a punch penetration amount that does not cause adjacent pipes to come into contact with each other. In addition, in the pressing process of the semi-finished product of the winding assembly 121a, the worker can ensure insulation between the pipes by performing the pressing process with an insulator such as insulating paper placed between the adjacent pipes. In this case, the worker may remove the insulator interposed between the pipes after the pressing process, or may leave it permanently installed.

[0075] Also, the worker can form the winding associations 121a, 121b, and 121c using one pipe material P. For example, the worker can repeat the process of partially setting one long pipe material P in the winding forming die M to form one winding 120, and then setting the portion of the pipe material P on which the winding 120 is not formed in the winding forming die M again to form one winding 120, thereby forming the winding associations 121a, 121b, and 121c that are continuously connected in a single piece by a single identical member using one pipe material P.

[0076] Also, the worker can prepare three winding forming dies M corresponding to the winding associations 121a, 121b, and 121c, respectively, and set one pipe material P in these three winding forming dies M to form the winding associations 121a, 121b, and 121c simultaneously in one shot. In this way, by forming the winding associations 121a, 121b, and 121c in a single piece, if the winding associations 121a, 121b, and 121c are made of a pipe material, a coolant made of gas or liquid can be circulated within the winding associations 121a, 121b, and 121c by connecting a pump to the winding associations 121a, 121b, and 121c.

[0077] Next, a description will be given of the manufacturing process of the axial gap motor 100. First, in the first step, an operator assembles the first stator half 110 and the second stator half 130. In this case, since the assembly steps of the first stator half 110 and the second stator half 130 are the same, the assembly step of the first stator half 110 will be described.

[0078] As shown in Fig. 14, the worker temporarily places core holders 115 (inner fixing member 116, outer fixing member 117, stopper 118) in housing 111. Next, the worker places windings 120 (winding associations 121a, 121b, 121c) on core holders 115 temporarily placed in housing 111. Next, the worker places stator cores 113 in windings 120 (winding associations 121a, 121b, 121c) placed in housing 111, as shown in Fig. 15.

[0079] Thereafter, the worker fixes the core holder 115 (the inner fixed member 116, the outer fixed member 117, and the stopper 118) by passing the bolts 116c and 117c through the through holes 111c of the housing 111 from the outer surface. In this case, the worker fixes the stator core 113 to the housing 111 by tightening the bolts 116c and 117c to the core holder 115 while fitting the fixed member side fitting portion 116a of the inner fixed member 116 into the core side fitting portion 114a of the teeth 113b and the fixed member side fitting portion 118a of the stopper 118 and fitting the fixed member side fitting portion 117a of the outer fixed member 117 into the core side fitting portion 114b of the teeth 113b and the fixed member side fitting portion 118a of the stopper 118.

[0080] As a result, stator core 113 and windings 120 are attached inside housing 111 to assemble first stator half 110. In this case, both ends of windings 120 (winding assembly 121a, 121b, 121c) are pulled out to the outside of housing 111 from through holes (not shown) formed around rotor through-hole 111a at the bottom of housing 111.

[0081] Next, in a second step, the worker assembles the rotor 150 to the first stator half 110. In this case, specifically, the worker passes the rotor shaft 151 of the rotor 150 through the rotor penetration portion 111a of the first stator half 110 via the bearing 111b, as shown in Fig. 16. In this case, the axial position of the rotor 150 in the first stator half 110 is determined by the bearing 111b.

[0082] Next, in the third step, the worker assembles the second stator half 130. Specifically, as shown in Fig. 17, the worker places the positioning portion 162 of the interposed portion 161 of the center plate 160 on the positioning portion 111d of the first stator half 110, and then places the second stator half 130, which has been assembled in the same manner as the first stator half 110, on this interposed portion 161. In this case, the worker fits the rotor shaft 151 of the rotor 150 into the bearing 131b, which is fitted into the rotor penetration portion 131a of the second stator half 130.

[0083] Then, the worker integrally assembles the housing 111, the intermediate portion 161, and the housing 131 with the bolts 112a and the nuts 112b. This integrally assembles the first stator half 110, the center plate 160, and the second stator half 130 to complete the axial gap motor 100 (see FIGS. 1 and 17). In other words, two sets of stators are attached to one rotor 150.

[0084] In addition, if the gap S between the magnet facing portion 113a of the first stator half 110 and the magnet 158 ​​and / or the gap S between the magnet facing portion 133a of the second stator half 130 and the magnet 158 ​​is not the desired distance, the gap S can be adjusted by reducing the thickness of the positioning portion 162 of the center plate 160 and / or the thickness of the positioning portions 111d, 131d of the housings 111, 131 by cutting or by preparing a new center plate 160.

[0085] (Operation of the axial gap motor 100) Next, the operation of the axial gap motor 100 configured as described above will be described. The axial gap motor 100 is used, for example, as a prime mover for a propeller in a drone. In this case, in the axial gap motor 100, a propeller is connected to a rotor shaft 151 of a rotor 150, and three-phase AC is supplied to the windings 120, 140 from a battery provided in the drone via a three-phase inverter.

[0086] In the axial gap motor 100, the rotor 150 is driven to rotate in response to control operations by the drone pilot. In this case, in the axial gap motor 100, a magnetic circuit is formed between the windings 120, 140 and the stator cores 113, 133 and the magnet 158. In this case, in the axial gap motor 100, the magnet holder 153 arranged opposite the windings 120, 140 is made of an insulator, so that the amount of heat generated by eddy currents can be suppressed and high output can be achieved.

[0087] Furthermore, in the axial gap motor 100, the magnet facing portions 113a, 133a of the stator cores 113, 133 are formed to protrude like flanges from the teeth 113b, 133b arranged in the windings 120, 140, respectively, so that the magnetic flux generated by the windings 120, 140 can be efficiently guided to the magnet 158 ​​to generate a magnetic circuit, thereby achieving high output of the axial gap motor 100. In this case, the magnet facing portions 113a, 133a can also prevent the heat of the windings 120, 140 from propagating to the magnet 158.

[0088] In this case, the magnetic circuit MC formed between the windings 120, 140 and the stator cores 113, 133 and the magnets 158 is formed between adjacent magnets 158 arranged along the circumferential direction of the magnet holder 153, as shown in FIG. 18, and is not formed through the rotor shaft 151 including the flange portion 151a, so that heat generation in the rotor shaft 151 can also be suppressed.

[0089] Furthermore, in the axial gap motor 100, the core holders 115, 135 fix the outer peripheries of the teeth 113b, 133b to the housings 111, 131, so that it is possible to minimize the influence of the axial magnetic flux of the windings 120, 140 flowing through the teeth 113b, 133b, and to suppress heat generation in the core holders 115, 135. In this case, the core holders 115, 135 are able to suppress heat generation in the bolts 116c, 136c, because the bolts 116c, 136c are located outside the teeth 113b, 133b.

[0090] Furthermore, in the axial gap motor 100, the windings 120, 140 are formed hollow and have an air layer inside, which can suppress heat generation from the windings 120, 140. As a result, the axial gap motor 100 makes it possible to employ a magnet with a relatively weak magnetic force, such as a bonded magnet, as the magnet 158.

[0091] Furthermore, the axial gap motor 100 has the center plate 160 formed between the two housings 111 and 131 protruding radially outward and has the jacket 164, so that heat inside the housings 111, 131 can be released to the outside to suppress temperature rise. The center plate 160 can also damp vibrations that are generated in each of the first stator half 110 and the second stator half 130 and propagate to an object to which the axial gap motor 100 is attached.

[0092] Furthermore, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the object of the present invention.

[0093] For example, in the above embodiment, the magnet holder 153 is made of prepreg. However, it is sufficient that the magnet holder 153 is made of an insulating material. Therefore, the magnet holder 153 can be made of, for example, carbon fiber reinforced plastic, glass fiber reinforced plastic, or a material other than a resin material (for example, ceramic).

[0094] Also, in the above embodiment, first magnet holding portion 156 and second magnet holding portion 157 of magnet holder 153 are formed in an annular shape surrounding the outer periphery of magnet 158. However, first magnet holding portion 156 and second magnet holding portion 157 can also be configured to be formed to surround and hold part of magnet 158 ​​rather than the entire circumference. In other words, first magnet holding portion 156 and second magnet holding portion 157 may have a notch formed (e.g., C-shaped) in part of the entire circumference of magnet 158.

[0095] In the above embodiment, the magnet holder 153 is formed such that the first magnet holding portion 156 and the second magnet holding portion 157 are shifted from each other in the circumferential direction. However, the magnet holder 153 may be formed such that the first magnet holding portion 156 and the second magnet holding portion 157 are formed at the same position from each other in the circumferential direction. That is, the first magnet holding portion 156 and the second magnet holding portion 157 can be configured with only the communicating portions 156a and 157a, omitting the non-communicating portions 156b and 157b. The magnet holder 153 may also be formed such that the first magnet holding portion 156 and the second magnet holding portion 157 are shifted from each other in the circumferential direction so that they do not overlap each other.

[0096] In the above embodiment, magnet holder 153 is configured to have first magnet holding portion 156 and second magnet holding portion 157 in the form of through holes. However, magnet holder 153 can have first magnet holding portion 156 and second magnet holding portion 157 formed in the form of bottomed holes. Magnet holder 153 can also be formed in the form of a simple plate without through holes, and magnets 158 can be attached to positions corresponding to the positions where first magnet holding portion 156 and second magnet holding portion 157 are formed.

[0097] In the above embodiment, the magnet holder 153 is formed by bonding together the first holder half 154 and the second holder half 155. In other words, the magnet holder 153 is formed as a laminate. However, the magnet holder 153 can also be formed as a single-layer integral body by integrally molding the first holder half 154 and the second holder half 155 from a resin material.

[0098] In the above embodiment, the core holder 115, 135 is configured to include the inner fixed member 116, 136, the outer fixed member 117, 137, and the stopper 118, 138. However, the core holder 115, 135 may be configured by molding some or all of the inner fixed member 116, 136, the outer fixed member 117, 137, and the stopper 118, 138 as a single unit.

[0099] In the above embodiment, the windings 120, 140 are configured as hollow pipes. However, the windings 120, 140 may also be configured as solid wires. The windings 120, 140 can enhance the cooling effect in the housings 111, 131 by allowing air (or an inert gas) to flow in the hollow portion, or by filling or allowing a liquid or viscous fluid such as water or antifreeze to flow in the hollow portion.

[0100] In the above embodiment, the axial gap motor 100 is configured with the center plate 160 interposed between the first stator half 110 and the second stator half 130. However, the axial gap motor 100 can be configured by directly connecting the first stator half 110 and the second stator half 130 and omitting the center plate 160. The vibration-proofing properties of the center plate 160 can be improved by disposing a vibration-damping member made of an elastic material such as rubber between the first stator half 110 and the second stator half 130.

[0101] In the above embodiment, the center plate 160 is configured to include the intermediate portion 161 and the connecting portion 165. However, the center plate 160 may be configured to omit the connecting portion 165. In this case, the axial gap motor 100 may be configured, for example, to form the bolt 112a long so that the housings 111, 131 are directly attached to an attachment target such as a drone.

[0102] In the above embodiment, the connecting portion 165 is formed in a plate shape extending radially outward from the housings 111, 131. However, the connecting portion 165 may be formed in a rod or block shape extending radially outward from the housings 111, 131, or may be formed in such a way that a hole portion or a female screw portion for passing a bolt therethrough protrudes intermittently from the outer periphery of the intermediate portion 161 along the circumferential direction, like the connecting portions 111e, 131e of the housings 111, 131.

[0103] In the above embodiment, the extension portion 163 of the center plate 160 is formed to protrude radially outward from the housings 111, 131. However, the center plate 160 may be formed to have a size such that the extension portion 163 is flush with the cylindrical outer periphery of the housings 111, 131 or the connecting portion 111e, 131e or is located radially inward from these.

[0104] In the above embodiment, the center plate 160 is configured to include the jacket 164 having a bottomed hole shape. However, the center plate 160 may be configured without the jacket 164. In the above embodiment, the jacket 164 is formed outside the housing 111, 131, but it may be formed inside the housing 111, 131. The center plate 160 may be configured such that the jacket 164 is filled with a fluid or a viscous fluid such as air, an inert gas, water, or an antifreeze liquid, and is closed by the first stator half 110 or the second stator half 130. In this case, the center plate 160 may use a pump to move the fluid or the fluid inside the jacket 164.

[0105] Furthermore, in the above embodiment, the axial gap motor 100 is provided with the convex positioning portions 111d, 131d on the housings 111, 131, and the concave positioning portion 162 is formed on the center plate 160. However, the axial gap motor 100 can also be provided with the concave positioning portions 111d, 131d on the housings 111, 131, and the convex positioning portion 162 that fits into the positioning portions 111d, 131d is formed on the center plate 160. Furthermore, these positioning portions 111d, 131d, 162 can also be configured with flat surfaces when radial positioning of the housings 111, 131 is omitted and only the gap S is defined.

[0106] Furthermore, in the above embodiment, in the axial gap motor 100, the stator cores 113, 133 are in direct contact with the bottoms of the housings 111, 131 via the teeth 113b, 133b. This allows the axial gap motor 100 to effectively release heat generated in the stator cores 113, 133 to the outside via the housings 111, 131. However, the axial gap motor 100 can also be configured so that the stator cores 113, 133 do not directly contact the housings 111, 131.

[0107] In the above embodiment, the axial gap motor 100 is configured with the stator cores 113, 133 disposed on both axial sides of the magnet holder 153. However, the axial gap motor 100 can also be configured with the stator core 113 or the stator core 133 disposed on one of the axial sides of the magnet holder 153.

[0108] In the above embodiment, the axial gap motor 100 is used as a driving source for the propeller of a drone. However, the axial gap motor 100 according to the present invention can be used as a prime mover for a manned aircraft such as a driving source for the main rotor or tail rotor of a helicopter other than a drone, as well as a driving source for a self-propelled vehicle (including an electric wheelchair), that is, an in-wheel motor. The axial gap motor 100 according to the present invention can also be used as a driving source for a ship, a machine tool, or a construction machine. The axial gap motor 100 according to the present invention can also be used as a generator. [Explanation of symbols]

[0109] S: Gap between magnet facing part and magnet, M: Winding forming die, M1: Die plate, SK: Forming part, M2: Punch, P: Pipe material, E: Eject pin, MC: Magnetic circuit, 100...Axial gap motor, 110...first stator half, 111...housing, 111a...rotor through portion, 111b...bearing, 111c...through hole, 111d...positioning portion, 111e...connecting portion, 112a...bolt, 112b...nut, 113...stator core, 113a...magnet facing portion, 113b...teeth, 114a, 114b...core side fitting portion, 115...core holder, 116...inner fixing member, 116a...fixed member side fitting portion, 116b...mounting through hole, 116c...bolt, 117...outer fixing member, 117a...fixed member side fitting portion, 117b...mounting through hole, 117c...bolt, 118...stopper, 118a...fixed member side fitting portion, 120...winding, 120a...connecting member, 121a, 121b, 121c...winding assembly, 130...second stator half, 131...housing, 131a...rotor through portion, 131b...bearing, 131c...through hole, 131d...positioning portion, 131e...connecting portion, 133...stator core, 133a...magnet facing portion, 133b...teeth, 134a, 134b...core side fitting portion, 135...core holder, 136...inner fixing member, 136a...fixed member side fitting portion, 136b...mounting through hole, 136c...bolt, 137...outer fixing member, 137a...fixed member side fitting portion, 137b...mounting through hole, 137c...bolt, 138...stopper, 138a...fixed member side fitting portion, 140...winding, 140a...connecting member, 141a, 141b, 141c...winding assembly, 150... rotor, 151... rotor shaft, 151a... flange portion, 151b... through hole, 152... bolt, 153... magnet holder, 154... first holder half, 154a... shaft through hole, 154b... mounting hole, 155... second holder half, 155a... shaft through hole, 155b... mounting hole, 156... first magnet holding portion, 156a... communication portion, 156b... non-communication portion, 157... second magnet holding portion, 157a... communication portion, 157b... non-communication portion, 158... magnet, 159... clamp, 159a... shaft through hole, 159b... female screw hole, 160...center plate, 161...interposition portion, 162...positioning portion, 163...extension portion, 163a...through hole, 164...jacket, 165...connecting portion.

Claims

1. a rotor in which a magnet holder, with a plurality of magnets exposed on both sides of a plate body and arranged in a circular shape, is provided around a rotatable rotor shaft so as to protrude in a flange-like manner; two sets of stators each having a plurality of electromagnets arranged in an annular shape on both sides of the magnet holder at positions facing the magnets with gaps between them; and two housings each formed with a recessed shape that opens to both sides of the magnet holder and that accommodate the two sets of stators, respectively. The two housings are: An axial gap motor, characterized in that the magnet holder is integrally connected via an annular center plate arranged radially outside the magnet holder.

2. In the axial gap motor according to claim 1, The center plate is An axial gap motor comprising: a connecting portion for mounting the axial gap motor to an object to which the axial gap motor is to be mounted.

3. In the axial gap motor according to claim 1, The center plate is An axial gap motor, characterized in that it is formed so as to protrude radially outward from the magnet holder relative to the two housings.

4. In the axial gap motor according to claim 1, The center plate is a jacket that is recessed or penetrates in the axial direction of the rotor shaft along the circumferential direction of the center plate.

5. In the axial gap motor according to claim 1, The center plate is An axial gap motor having convex or concave positioning portions which fit into the two housings, respectively.

6. In the axial gap motor according to claim 1, An axial gap motor, characterized in that the stator cores constituting each of the electromagnets in the two sets of stators are in direct contact with the two housings, respectively.

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