Rotating electric machines

Abstract

The axial gap type motor is provided with: a stator; and a rotor, which is arranged to be opposite to the stator in the axial direction. The rotor is provided with an annular rotor yoke and a plurality of magnets, which are arranged at predetermined intervals in the circumferential direction so that the magnetic poles are alternately different, and the plurality of magnets are in contact with one surface of the rotor yoke. The aforementioned one surface includes a plurality of facing areas and non-facing areas, the plurality of facing areas face and contact the plurality of magnets, and the non-facing areas do not face the plurality of magnets. The non-facing area includes a local area, each of which is located between a pair of facing areas adjacent to each other in the circumferential direction in the plurality of facing areas, and the local area is formed as a recessed portion that is axially recessed relative to the facing area.

Description

Technical Field

[0001] The present disclosure relates to a rotating electric machine.

[0002] This application claims priority from Japanese Patent Application No. 2018-173510 filed on September 18, 2018, which is hereby incorporated by reference herein in its entirety. Background Art

[0003] In recent years, an axial gap type motor having a thin size and providing a high torque (torque) has attracted attention.

[0004] In an axial gap motor, a gap is provided between a rotor and a stator in the axial direction (for example, see Non-Patent Document 1).

[0005] Citation List

[0006] [Non-patent literature]

[0007] Non-patent document 1: Asako Watanabe et al., “Thin and High-Torque Axial Gap Motor Using Soft Magnetic Powder Cores”, January 2018, SEI technical review, No. 192, pp. 119-125. Summary of the invention

[0008] The rotating electric machine according to the embodiment includes: a stator; and a rotor, which is arranged to be opposite to the stator in the axial direction. The rotor includes: an annular rotor yoke; and a plurality of magnets, which are arranged to contact one surface of the rotor yoke so as to be arranged at predetermined intervals in the circumferential direction, and the magnetic poles of the plurality of magnets are alternately different. One surface includes a plurality of facing areas and non-facing areas, the plurality of facing areas face and contact the plurality of magnets, and the non-facing areas do not face the plurality of magnets. The non-facing area includes a local area, each of which is located between a pair of facing areas adjacent to each other in the circumferential direction in the plurality of facing areas. The local area is formed as a recessed portion that is axially recessed relative to the facing area. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] [ Figure 1 ] Figure 1 is a perspective view showing the structure of an axial gap type motor according to an embodiment.

[0010] [ Figure 2 ] Figure 2 is an external view of a main body portion according to the first embodiment.

[0011] [ Figure 3 ] Figure 3is an external view of the rotor yoke according to the first embodiment.

[0012] [ Figure 4 ] Figure 4 This is a view of one surface of the rotor yoke viewed from the axial direction.

[0013] [ Figure 5 ] Figure 5 This is a partial cross-sectional view of an axial gap type motor.

[0014] [ Figure 6 ] Figure 6 yes Figure 5 Magnified view of a specific section.

[0015] [ Figure 7 ] Figure 7 is a partial cross-sectional view of an axial gap type motor according to a second embodiment.

[0016] [ Figure 8 ] Figure 8 is a perspective view of a rotor used in a conventional axial gap type motor.

[0017] [ Fig. 9 ] Fig. 9 is a cross-sectional view showing a portion of a conventional axial gap type motor. DETAILED DESCRIPTION

[0018] [Problems to be Solved by the Present Disclosure]

[0019] The structure of the axial gap motor includes a double-stator structure and a single-stator structure. The stators in the double-stator structure are arranged on both sides of the rotor in the axial direction, and the stator in the single-stator structure is arranged on only one side of the rotor in the axial direction.

[0020] Figure 8 is a perspective view of a rotor used in a conventional axial gap type motor.

[0021] exist Figure 8 In the embodiment, a rotor 100 for a single stator structure includes an annular body portion 101 having a plurality of magnets 102 , and an annular rotor yoke 103 concentrically fixed to the body portion 101 .

[0022] The plurality of magnets 102 are held by a holding member 104 made of a non-magnetic material, thereby forming an annular body portion 101. The plurality of magnets 102 are arranged at predetermined intervals in the circumferential direction, and the magnetic poles of the plurality of magnets 102 are alternately different.

[0023] The rotor yoke 103 is fixed with one surface 103 a thereof in contact with the main body portion 101 .

[0024] Fig. 9 is a cross-sectional view showing a portion of a conventional axial gap type motor. Fig. 9 , the arrows indicate the magnetic flux flowing through the various parts.

[0025] like Fig. 9 As shown, the rotor 100 is disposed to be opposed to the teeth 105 as the iron core in the axial direction, and the teeth 105 are provided to protrude on the stator and are wound with coils.

[0026] A plurality of magnets 102 a , 102 b arranged at predetermined intervals in the circumferential direction and a holding member 104 interposed between the plurality of magnets 102 a , 102 b are in contact with one surface 103 a of the rotor yoke 103 .

[0027] Therefore, one surface 103a of the rotor yoke 103 has facing regions 106a, 106b facing and contacting the magnets 102a, 102b, and a non-facing region 107 facing and contacting the holding member 104 without facing the magnets 102a, 102b.

[0028] exist Fig. 9 , the magnetic flux from the magnet 102a flows from the magnetic pole surface 102a1 of the magnet 102a as the N pole to the magnetic pole surface 102b1 of the magnet 102b as the S pole through the rotor yoke 103.

[0029] The flow of magnetic flux from the magnet 102 a to the magnet 102 b becomes a magnetic flux linkage as magnetic flux penetrating the coil wound around the tooth portion 105 .

[0030] The flux linkage affects the output torque of the axial gap motor. That is, the greater the flux linkage, the greater the output torque of the axial gap motor.

[0031] However, there is a case where a magnetic short circuit occurs between the side surface 102a2 of the magnet 102a and the non-facing region 107 and between the side surface 102b2 of the magnet 102b and the non-facing region 107, and therefore, Fig. 9 As shown, magnetic flux given from pole surface 102a1 to rotor yoke 103 flows from non-facing region 107 to side surface 102a2 before reaching magnet 102b side, or magnetic flux flowing from magnet 102b toward teeth 105 flows from side surface 102b2 to non-facing region 107.

[0032] When this magnetic short circuit occurs, the flux linkage is reduced, thus causing the motor's output torque to decrease.

[0033] The present disclosure has been made in view of the above-described circumstances, and an object of the present disclosure is to provide a rotating electric machine capable of improving output.

[0034] [Effects of the present disclosure]

[0035] The present disclosure makes it possible to increase output.

[0036] First, the contents of each embodiment are listed and described.

[0037] [Overview of Embodiments]

[0038] (1) A rotating electric machine according to an embodiment includes: a stator; and a rotor, which is arranged to be opposite to the stator in the axial direction. The rotor includes an annular rotor yoke, and a plurality of magnets, which are arranged to contact one surface of the rotor yoke so as to be arranged at predetermined intervals in the circumferential direction, and the magnetic poles of the plurality of magnets are alternately different. One surface includes a plurality of facing areas, the plurality of facing areas face and contact the plurality of magnets, and the non-facing areas do not face the plurality of magnets. The non-facing area includes a local area, each of which is located between a pair of facing areas adjacent to each other in the circumferential direction in the plurality of facing areas. The local area is formed as a recessed portion that is recessed in the axial direction relative to the facing area.

[0039] In the rotary electric machine having the above-mentioned configuration, on one surface of the rotor yoke, a local area of ​​the non-facing area between a pair of facing areas adjacent to each other in the circumferential direction is formed as a recess. Therefore, the rotor yoke surface in the non-facing area can be further spaced apart from a pair of magnets contacting a pair of facing areas, compared with the case where there is no recess in the conventional example. Therefore, the magnetic resistance between the rotor yoke surface in the non-facing area and the pair of magnets can be increased.

[0040] Therefore, magnetic short circuit between the rotor yoke surface and a pair of magnets in the non-facing area can be suppressed, and the reduction of magnetic flux linkage due to short circuit can be suppressed. As a result, a larger amount of magnetic flux linkage can be generated, thereby increasing the output of the rotating electric machine.

[0041] (2) In the above-mentioned rotating electrical machine, a cross-sectional shape of the recessed portion in a range between the pair of facing regions is a shape in which an opening edge and a bottom portion of the recessed portion are connected by a curved surface.

[0042] In this case, in the recessed portion, the distance between the side wall portion and the bottom portion from the opening edge to the bottom portion is suppressed from being shortened, and therefore the occurrence of a magnetic short circuit within the recessed portion can be suppressed.

[0043] (3) In the above-mentioned rotating electric machine, the opening edge of the recess formed by the edges of the pair of facing regions may be located on the magnetic pole surfaces of a pair of magnets in contact with the pair of facing regions among the plurality of magnets.

[0044] In this case, the opening width of the recess can be made larger than a predetermined interval between a pair of magnets adjacent to each other in the circumferential direction, and thus the recess can be provided to ensure that the non-facing region is included in the circumferential direction.

[0045] (4) In the above-mentioned rotating electrical machine, the recessed portion may extend from the inner circumferential edge to the outer circumferential edge on one surface.

[0046] In this case, when providing the recessed portion, it is not necessary to adjust the position of the recessed portion in the radial direction at least, so that it becomes easy to provide the recessed portion.

[0047] In the above rotating electrical machine, the stator may have a stator core formed of a press-formed body of soft magnetic powder whose surface is coated with an insulating film.

[0048] [Details of each embodiment]

[0049] Hereinafter, preferred embodiments will be described with reference to the accompanying drawings.

[0050] At least some parts of the embodiments described below may be combined together as desired.

[0051] [Structure of axial gap type motor]

[0052] Figure 1 is a perspective view showing the structure of the axial gap type motor according to the present embodiment. Figure 1 In the figure, part of the structure is not shown to illustrate the internal structure.

[0053] exist Figure 1 In the drawings, the axial gap type motor 1 is a motor in which a gap is provided between a rotor and a stator in the axial direction, and includes a disc-shaped rotor 2, a stator 4, and a housing 6 accommodating the rotor 2 and the stator 4, thus having a single-stator structure.

[0054] exist Figure 1 In the embodiment, the rotating shaft which is inserted into the hole portion 6a of the housing 6 and is rotatably provided relative to the housing 6 is not shown. It should be noted that the axial direction is a direction parallel to the axis S of the rotating shaft.

[0055] The rotor 2 has an annular shape and is fixed to a rotating shaft (not shown) so as to rotate integrally with the rotating shaft.

[0056] The rotor 2 includes an annular main body portion 7 having a plurality of magnets 8 , and an annular rotor yoke 9 concentrically fixed to the main body portion 7 .

[0057] The rotor 2 will be described in detail later.

[0058] The stator 4 is disposed opposite to one surface 2a of the rotor 2, and a gap is provided in the axial direction between the stator 4 and the one surface 2a. The stator 4 is annular in shape and is disposed concentrically with the rotor 2. The stator 4 is fixed to a cover 10 of the housing 6. Therefore, the rotor 2 and the stator 4 are configured to be rotatable relative to each other.

[0059] The stator 4 includes a stator core 20 and a plurality of coils 24 wound around a plurality of teeth 22 included in the stator core 20 .

[0060] The stator core 20 is formed of a soft magnetic powder core. The soft magnetic powder core is a pressed body of soft magnetic powder with an insulating film coated on the surface.

[0061] The end surfaces 22a of the plurality of teeth 22 around which the coils 24 are wound face the one surface 2a of the rotor 2. A gap is formed between the end surfaces 22a of the plurality of teeth 22 and the one surface 2a of the rotor 2.

[0062] [Rotor According to First Embodiment]

[0063] As described above, the rotor 2 includes the main body portion 7 and the rotor yoke 9 .

[0064] Figure 2 It is an external view of the main body 7.

[0065] like Figure 2 As shown, the main body 7 is formed in an annular plate shape having a hole 7c for inserting the rotating shaft. The plurality of magnets 8 are held by a holding member 11 made of a non-magnetic material such as austenitic stainless steel, for example.

[0066] Neodymium bond magnets, neodymium sintered magnets, or the like are used as the plurality of magnets 8. The material used for the magnets 8 preferably satisfies the condition that the residual magnetization (Br) of the magnets 8 is 0.7 T (Tesla) or more.

[0067] The plurality of magnets 8 are all formed in a plate shape. One surface 8a and the other surface 8b of each of the plurality of magnets 8 are exposed on one surface 7a and the other surface 7b of the main body, respectively. The outer shape of each of the plurality of magnets 8 is a sector having a small diameter arc and a large diameter arc.

[0068] The plurality of magnets 8 are arranged in a ring shape along the circumferential direction.

[0069] One surface 8a and the other surface 8b of each of the plurality of magnets 8 are magnetic pole surfaces. Among the plurality of magnets 8, the magnets 8 adjacent to each other are arranged so that the magnetic poles of the one surface 8a (the other surface 8b) of the magnet 8 are different from each other. That is, the magnetic poles of the one surface 8a (the other surface 8b) of the plurality of magnets 8 are alternately different in the circumferential direction.

[0070] The holding member 11 includes: an annular portion 11 a ; a plurality of columnar portions 11 b extending radially outward from the annular portion 11 a ; and an outer peripheral holding portion 11 c provided at ends of the plurality of columnar portions 11 b .

[0071] The annular portion 11a contacts the inner peripheral surfaces of the plurality of magnets 8. The columnar portion 11b is inserted between the magnets 8 adjacent in the circumferential direction and contacts the radial side surfaces of the plurality of magnets 8. The outer peripheral holding portion 11c contacts the outer peripheral surfaces of the plurality of magnets 8.

[0072] In this way, the holding member 11 comes into contact with the periphery of the plurality of magnets 8 , thereby holding the plurality of magnets 8 in the ring shape.

[0073] As described above, the rotor yoke 9 is fixed to the other surface 7 b of the main body portion 7 .

[0074] Figure 3 is an external view of the rotor yoke 9.

[0075] For example, the rotor yoke 9 is formed into an annular plate shape using a steel plate for mechanical structure. The material used as the rotor yoke 9 preferably satisfies the condition that the material is a magnetic material having a relative magnetic permeability of 100 or more.

[0076] The inner diameter and the outer diameter of the rotor yoke 9 are almost equal to the inner diameter and the outer diameter of the main body portion 7 .

[0077] Therefore, when the rotor yoke 9 is fixed to the main body portion 7 , the inner and outer peripheral surfaces of the rotor yoke 9 are almost flush with the inner and outer peripheral surfaces of the main body portion 7 .

[0078] The rotor yoke 9 is fixed with one surface 9 a thereof in contact with the other surface 7 b of the body portion 7 .

[0079] like Figure 3 As shown, one surface 9 a of the rotor yoke 9 includes: a plurality of recessed portions 30 extending from an inner circumferential edge 9 a 1 to an outer circumferential edge 9 a 2 on the one surface 9 a ; and a plurality of flat portions 32 connecting adjacent recessed portions 30 .

[0080] The plurality of recessed portions 30 are recessed grooves which are recessed in the axial direction relative to the flat surface portion 32 and extend radially from the inner circumferential edge 9 a 1 to the outer circumferential edge 9 a 2 so as to correspond to the columnar portion 11 b of the retaining member 11 .

[0081] The groove width dimension of the recessed portion 30 is the same as the width dimension of the column portion 11b. In addition, the angular intervals of the recessed portions 30 along the circumferential direction are the same as the angular intervals of the column portion 11b along the circumferential direction.

[0082] The rotor yoke 9 is fixed to the other surface 7 b of the body portion 7 in a state where the plurality of recessed portions 30 and the plurality of columnar portions 11 b are matched with each other over the entire range in the radial direction.

[0083] Figure 4 This is a view of one surface 9a of the rotor yoke 9 viewed from the front in the axial direction.

[0084] The plurality of recessed portions 30 and the plurality of columnar portions 11 b are set to match each other over the entire range in the radial direction. Therefore, the other surface 8 b of the magnet 8 of the body portion 7 faces and contacts the respective flat surface portions 32 .

[0085] The other surface 8b of the magnet 8 matches with a plurality of regions 40 indicated by dotted hatching on the plane portion 32. Therefore, the region 40 forms a plurality of facing regions 40 that face and contact with the other surface 8b of the plurality of magnets 8.

[0086] On the other hand, a region other than the facing region 40 on the one surface 9 a is a non-facing region 41 that does not face the other surface 8 b of the plurality of magnets 8 .

[0087] like Figure 4 As shown, the non-facing area 41 exists in the entire area of ​​the recessed portion 30 and in the vicinity of the inner circumferential edge and the outer circumferential edge of the flat portion 32 .

[0088] That is, the non-facing region 41 includes a partial region located between pairs of facing regions 40 adjacent to each other in the circumferential direction among the plurality of facing regions 40 .

[0089] The recessed portion 30 is provided in a partial region of the non-facing region 41 between pairs of facing regions 40 adjacent to each other in the circumferential direction.

[0090] Figure 5 is a partial cross-sectional view of the axial gap type motor 1 , and shows a cross section perpendicular to one column portion 11 b . Figure 5 The cross section shown is perpendicular to Figure 5 A cross section of the column portion 11b at the center of FIG.

[0091] like Figure 5 As shown, in a state where the rotor yoke 9 is fixed to the main body portion 7 , the plurality of recessed portions 30 provided on one surface 9 a of the rotor yoke 9 are matched with the plurality of columnar portions 11 b .

[0092] As described above, the rotor 2 is disposed opposite to the stator 4 , and a gap is provided between the rotor 2 and the stator 4 in the axial direction.

[0093] More specifically, one surface 7 a of the body portion 7 (one surface 2 a of the rotor 2 ) and the end surfaces 22 a of the plurality of teeth portions 22 are opposed to each other.

[0094] Therefore, the magnetic flux from the magnet 8 passes through the coil 24 wound around the tooth portion 22 and becomes a magnetic flux linkage.

[0095] Figure 6 yes Figure 5 Magnified view of a specific portion of the . Figure 6 The arrows in indicate the magnetic flux flowing through each section. Figure 6, the magnet 8 at the left side of the drawing is referred to as magnet 81 , and the magnet 8 at the right side of the drawing is referred to as magnet 82 .

[0096] As described above, the groove width dimension of the recess 30 is the same as the width dimension of the column 11b. Therefore, one opening edge 30a of the recess 30 matches the boundary between the column 11b and the magnet 81, and the other opening edge 30a matches the boundary between the column 11b and the magnet 82.

[0097] Preferably, the depth dimension of the recess 30 is set to be no greater than 50% of the thickness dimension of the rotor yoke 9 .

[0098] The flat surface portion 32a of the rotor yoke 9 contacts the other surface 81b which is the magnetic pole surface (N pole) of the magnet 81. The flat surface portion 32b contacts the other surface 82b which is the magnetic pole surface (S pole) of the magnet 82.

[0099] exist Figure 6 In the embodiment, the magnetic flux from the magnet 81 flows from the other surface 81 b of the magnet 81 to the other surface 82 b of the magnet 82 through the rotor yoke 9 .

[0100] The flow of magnetic flux from the magnet 81 to the magnet 82 becomes a magnetic flux linkage as magnetic flux penetrating the coil 24 wound around the tooth portion 22 .

[0101] In the present embodiment, on one surface 9a of the rotor yoke 9, a local area of ​​the non-facing area 41 between a pair of facing areas 40 (planar portions 32a, 32b) adjacent to each other in the circumferential direction is formed as a recess 30. Therefore, compared with the case where there is no recess in the conventional example, the surface of the rotor yoke 9 located in the non-facing area 41 (the inner surface of the recess 30) can be further spaced from the side surface 81c of the magnet 81 and the side surface 82c of the magnet 82. Therefore, the magnetic resistance between the surface of the rotor yoke 9 located in the non-facing area 41 (the inner surface of the recess 30) and the side surface 81c of the magnet 81 (the side surface 82c of the magnet 82) can be increased.

[0102] Therefore, it is possible to suppress the occurrence of magnetic short circuits between the surface of the rotor yoke 9 located in the non-facing area 41 (the inner surface of the recess 30), the side surface 81c of the magnet 81 (the side surface 82c of the magnet 82), and the magnet, and to suppress the reduction of magnetic flux linkage due to the short circuit. As a result, a larger amount of magnetic flux linkage can be generated, thereby improving the output torque of the axial gap type motor 1.

[0103] like Figure 6 As shown, the cross-sectional shape of the recess 30 in the range between the pair of facing regions 40 (the flat surface portions 32a, 32b) is a shape in which the opening edge 30a and the bottom 30b of the recess 30 are connected by a curved surface.

[0104] In this case, in the recess 30 , the distance between the side wall portion from the opening edge 30 a to the bottom 30 b and the bottom 30 b is suppressed from being shortened, and thus the occurrence of a magnetic short circuit inside the recess 30 can be suppressed.

[0105] In the present embodiment, the recess 30 is formed in a groove shape extending from the inner circumferential edge 9a1 to the outer circumferential edge 9a2 on one surface 9a of the rotor yoke 9. Therefore, when the recess 30 is provided, at least the position of the recess 30 in the radial direction does not need to be adjusted, etc., so that it becomes easy to provide the recess 30.

[0106] [Rotor According to Second Embodiment]

[0107] Figure 7 is a partial cross-sectional view of an axial gap type motor 1 according to a second embodiment.

[0108] This embodiment differs from the first embodiment in that one opening edge 30 a of the recess 30 is located on the other surface 81 b as the magnetic pole surface of the magnet 81 , and the other opening edge 30 a is located on the other surface 82 b as the magnetic pole surface of the magnet 82 .

[0109] Also in the present embodiment, the inner surface of the recess 30 and the magnet 81 (magnet 82 ) can be further spaced apart, whereby the magnetic resistance between the inner surface of the recess 30 and the magnet 81 (magnet 82 ) can be increased.

[0110] Also in this case, the opening width of the recess 30 can be made larger than the predetermined interval between a pair of magnets 8 adjacent to each other in the circumferential direction, and thus the recess 30 can be provided to ensure that the non-facing region 41 is included in the circumferential direction.

[0111] For example, when the opening width of the recess 30 is set to a size that is almost the same as the predetermined interval between a pair of magnets 8 adjacent to each other in the circumferential direction, the opening edge 30a of the recess 30 may be located on the column portion 11b due to component errors, assembly errors, etc., and this may become a cause of the occurrence of a magnetic short circuit.

[0112] In contrast, in the present embodiment, recess 30 is provided to ensure that non-facing region 41 is included in the circumferential direction. Therefore, occurrence of magnetic short circuit as described above can be suppressed, and magnetic resistance between the inner surface of recess 30 and magnet 81 (magnet 82) can be increased.

[0113] [Evaluation test]

[0114] Next, the results of an evaluation test conducted on the output torque of the axial gap type motor 1 according to the present embodiment will be described.

[0115] The evaluation test was conducted as follows. The axial gap type motor 1 of the first embodiment was used as an example product, and an axial gap type motor which differed from the example product only in that the rotor yoke was not provided with a groove portion was used as a comparative example product. The output torques of the example product and the comparative example product were calculated by CAE simulation, and the output torques of the example product and the comparative example product were compared with each other.

[0116] The output torque obtained from the example product was 4.96 Nm, and the output torque obtained from the comparative example product was 4.80 Nm.

[0117] From the above results, it can be found that the axial gap type motor of the present embodiment enables an increase in output torque.

[0118] [other]

[0119] The embodiments disclosed herein are merely illustrative in all aspects and should not be considered restrictive.

[0120] For example, in the above-described embodiment, the case where the recess 30 is provided on the rotor yoke 9 of the axial gap type motor 1 as a rotating electric machine has been shown. However, the same recess may be provided on the rotor yoke of the axial gap type generator. In this case, the output of the generator can be increased.

[0121] In the above-described embodiment, the case where the recessed portion 30 is provided in a groove shape in a local area of ​​the non-facing area 41 between a pair of circumferentially adjacent facing areas 40 has been shown. However, a plurality of recessed portions may be formed side by side in a local area of ​​the non-facing area 41 between a pair of circumferentially adjacent facing areas 40.

[0122] In the above-described embodiment, the case where the recessed portion 30 on one surface 9a of the rotor yoke 9 is provided to extend from the inner circumferential edge 9a1 to the outer circumferential edge 9a2 has been shown. However, the recessed portion 30 does not necessarily extend to a region other than a partial region between a pair of facing regions 40 adjacent to each other in the circumferential direction on the non-facing region 41. Therefore, the recessed portion 30 does not necessarily extend to a region other than a region between a pair of facing regions 40 and existing in the vicinity of the inner circumferential edge 9a1 and the outer circumferential edge 9a2 on one surface 9a of the rotor yoke 9.

[0123] In the above embodiment, the cross-sectional shape of the recess 30 within the range between the pair of facing regions is shown as a shape in which the opening edge 30a and the bottom 30b of the recess 30 are connected by a curved surface. However, the cross-sectional shape of the recess 30 may be other shapes such as a rectangular shape or a polygonal shape as long as the cross-sectional shape is concave in the axial direction.

[0124] The scope of the present disclosure is defined by the scope of the claims rather than the above description, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

[0125] Reference numerals list

[0126] 1 Axial gap motor

[0127] 2 Rotors

[0128] 2a A surface

[0129] 4 Stator

[0130] 6 Housing

[0131] 6a Hole

[0132] 7 Main body

[0133] 7a A surface

[0134] 7b Another surface

[0135] 7c hole

[0136] 8 Magnets

[0137] 8a A surface

[0138] 8b Another surface

[0139] 9 Rotor yoke

[0140] 9a A surface

[0141] 9a1 Inner peripheral edge

[0142] 9a2 Outer peripheral edge

[0143] 10 Cover

[0144] 11. Retaining member

[0145] 11a Ring

[0146] 11b Column

[0147] 11c Peripheral retaining part

[0148] 20 stator core

[0149] 22 teeth

[0150] 22a End face

[0151] 24 Coil

[0152] 30 concavity

[0153] 30a Opening edge

[0154] 30b Bottom

[0155] 32, 32a, 32b Flat surface

[0156] 40 Facing Area

[0157] 41 Non-facing area

[0158] 81 Magnet

[0159] 81b Another surface

[0160] 81c Side surface

[0161] 82 Magnet

[0162] 82b Another surface

[0163] 82c Side surface

[0164] S axis

Claims

1. A rotating electrical machine, comprising: stator; as well as a rotor arranged axially opposite to the stator, wherein: The rotor comprises: The annular rotor yoke, a plurality of magnets which are arranged in contact with one surface of the rotor yoke so as to be arranged at predetermined intervals in the circumferential direction and whose magnetic poles are alternately different, and a holding member that holds the plurality of magnets and is made of a non-magnetic material, The one surface includes a plurality of facing areas and non-facing areas, the plurality of facing areas face and contact the plurality of magnets, the non-facing areas do not face the plurality of magnets, the non-facing areas include partial areas, each of the partial areas is located between a pair of facing areas adjacent to each other in the circumferential direction in the plurality of facing areas, The partial region is formed as a recessed portion recessed in the axial direction relative to the facing region, the holding member includes a column portion inserted between magnets adjacent in the circumferential direction among the plurality of magnets, and The groove width of the concave portion is the same as the width of the column portion.

2. The rotating electrical machine according to claim 1, wherein: The cross-sectional shape of the recessed portion in the range between the pair of facing regions is a shape in which an opening edge and a bottom of the recessed portion are connected by a curved surface.

3. The rotating electrical machine according to claim 1 or 2, wherein: The opening edge of the recessed portion formed by the edges of the pair of facing regions is located on the magnetic pole surfaces of a pair of the magnets in contact with the pair of facing regions among the plurality of magnets.

4. The rotating electrical machine according to any one of claims 1 to 3, wherein: The recess extends from an inner peripheral edge to an outer peripheral edge on the one surface.

5. The rotating electrical machine according to any one of claims 1 to 4, wherein: The stator has a stator core formed of a press-formed body of soft magnetic powder whose surface is coated with an insulating film.

Images