Stator, magnetic gear electric machine, and method for assembling stator

Abstract

To provide a stator, a magnetic gear electric machine, and a method for assembling a stator, capable of preventing at least one of a plurality of magnets from falling out.SOLUTION: A Halbach-arrayed magnet group constituting a stator includes: a first radial magnet magnetized outward in a radial direction; a first circumferential magnet positioned on one side in a circumferential direction of the first radial magnet and magnetized toward the one side; and a second circumferential magnet positioned on the other side in the circumferential direction of the first radial magnet and magnetized toward the other side. At least one of one end surface and the other end surface in the circumferential direction of the first radial magnet has a first inclined end surface that is inclined toward a center side in the circumferential direction of the first radial magnet as the surface extends toward the inside in the radial direction. At least one of the other end surface in the circumferential direction of the first circumferential direction magnet and one end surface in the circumferential direction of the second circumferential direction magnet has a first abutting / inclined end surface that is inclined toward the center side in the circumferential direction of the first radial direction magnet as the surface extends toward the inside in the radial direction and that abuts the first inclined end surface.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a stator, a magnetic gear electric machine, and a method for assembling the stator. [Background technology]

[0002] The stator disclosed in Patent Document 1 is incorporated into a magnetic gear device. The stator includes a stator core and a plurality of magnets arranged in the circumferential direction on the radially inner side of the stator core. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2019 / 0157962 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventor of the present application has devised the application of a Halbach array, which concentrates magnetic flux radially inward from the stator, to the magnet arrangement of the stator. However, since the magnetization directions of adjacent magnets in the circumferential direction are different, there is a concern that the magnets may come off from the multiple teeth of the stator core. According to the inventor's knowledge, the magnetic force that a radially magnetized magnet receives is a relatively large force that faces inward in the radial direction, and there is a particular concern that the magnet may fall off.

[0005] An object of the present disclosure is to provide a stator, a magnetic gear electric machine, and an assembly method for a stator that can suppress the falling off of at least one of a plurality of magnets. [Means for solving the problem]

[0006] A stator according to at least one embodiment of the present disclosure includes: a stator core including a plurality of teeth spaced apart in a circumferential direction relative to an axis; A plurality of magnets including a magnet group continuously arranged in the circumferential direction radially inward of the plurality of teeth, the magnet group being arranged in a Halbach array; A stator comprising: The magnet group includes: a first radial magnet magnetized radially outward; a first circumferential magnet located on one side of the first radial magnet in the circumferential direction and magnetized to the one side; A second circumferential magnet is located on the other side of the circumferential direction relative to the first radial magnet and is magnetized on the other side; Including, At least one of the one end face and the other end face in the circumferential direction of the first radial magnet has a first inclined end face that inclines toward the center side of the circumferential direction of the first radial magnet as it moves toward the inside in the radial direction, At least one of the other end face in the circumferential direction of the first circumferential magnet or one end face in the circumferential direction of the second circumferential magnet has a first abutting inclined end face that inclines toward the center of the first radial magnet in the circumferential direction as it moves toward the inside in the radial direction and abuts against the first inclined end face.

[0007] According to one embodiment of the present disclosure, a magnetic gear electric machine includes: The stator, a pole piece rotor including a plurality of pole pieces arranged in the circumferential direction on the radially inner side of the stator; a magnet rotor including an inner magnet arranged radially inward of the plurality of magnetic pole pieces; Equipped with.

[0008] A method for assembling a stator according to an embodiment of the present disclosure includes: a stator core including a plurality of teeth spaced apart in a circumferential direction relative to an axis; A plurality of magnets including a magnet group continuously arranged in the circumferential direction radially inward of the plurality of teeth, the magnet group being arranged in a Halbach array; a plurality of protrusions that protrude radially inward beyond the plurality of teeth and are arranged alternately with the plurality of magnets in the circumferential direction; A method for assembling a stator comprising: The magnet group includes: a first radial magnet magnetized radially outward; a first circumferential magnet located on one side of the first radial magnet in the circumferential direction and magnetized to the one side; A second circumferential magnet is located on the other side of the circumferential direction relative to the first radial magnet and is magnetized on the other side; Including, At least one of the end faces of the first radial magnet in the circumferential direction has a first inclined end face that is inclined toward the center of the first radial magnet in the circumferential direction as it moves toward the inside in the radial direction, At least one of the other end surface in the circumferential direction of the first circumferential magnet and the one end surface in the circumferential direction of the second circumferential magnet has a first abutting inclined end surface that inclines toward the center side in the circumferential direction of the first radial magnet as it moves toward the inside in the radial direction and abuts against the first inclined end surface, The method for assembling the stator includes the steps of: disposing the first radial magnet between any two of the protrusions that are consecutively arranged in the circumferential direction; After performing the step of arranging the first radial magnets, the method further includes the step of arranging the first circumferential magnets and the second circumferential magnets between two other of the protrusions that are aligned consecutively in the circumferential direction. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a stator, a magnetic gear electric machine, and a method for assembling a stator, which are capable of suppressing the falling off of at least one of a plurality of magnets. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram of a magnetic gear electric machine according to an embodiment. [Diagram 2]FIG. 2 is a schematic diagram of a stator according to an embodiment. [Diagram 3] FIG. 3 is a partially enlarged view of FIG. [Figure 4] FIG. 13 is a schematic diagram illustrating forces acting on multiple magnets according to one embodiment. [Figure 5A] FIG. 2 is a schematic diagram of a plate according to the first embodiment. [Figure 5B] FIG. 11 is a schematic diagram of a plate according to a second embodiment. [Figure 5C] FIG. 11 is a schematic diagram of a plate according to a third embodiment. [Figure 6] FIG. 2 is a schematic diagram of a stator with plates according to an embodiment. [Figure 7] 4 is a flowchart of a method for assembling a stator according to an embodiment. [Figure 8] FIG. 13 is a schematic diagram illustrating a radial magnet placement step according to one embodiment. [Figure 9] FIG. 13 is a schematic diagram illustrating a circumferential magnet placement step according to one embodiment. [Figure 10] FIG. 11 is a schematic diagram of a stator according to another embodiment (first example). [Figure 11] FIG. 11 is a schematic diagram showing a radial magnet arrangement step according to another embodiment (second example). [Figure 12] FIG. 11 is a schematic diagram of a stator according to another embodiment (second example). [Figure 13] FIG. 11 is a schematic diagram of a stator according to another embodiment (third example). [Figure 14] FIG. 11 is a schematic diagram of a stator according to another embodiment (fourth example). [Figure 15] FIG. 13 is a schematic diagram of a stator according to another embodiment (fifth example). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure. For example, expressions expressing relative or absolute configuration, such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial," not only strictly express such a configuration, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions indicating that things are in an equal state, such as "identical," "equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to rectangular shapes, cylindrical shapes, etc. in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained. On the other hand, the expressions "comprise", "include", or "have" a certain element are not exclusive expressions excluding the presence of other elements. In addition, the same components are denoted by the same reference numerals and the description thereof may be omitted.

[0012] <Overall Configuration of Magnetic Gear Electric Machine 10> FIG. 1 is a schematic diagram of a magnetic gear electric machine 10 according to an embodiment of the present disclosure. The magnetic gear electric machine 10 includes a rotating shaft 18 connected to an external device 9. In the following description, the term "axial direction" refers to the axial direction of the axis S of the rotating shaft 18, the term "circumferential direction" refers to the circumferential direction based on the axis S, and the term "radial direction" refers to the radial direction based on the axis S. The term "radial inner side" refers to the direction toward the axis S, and the term "radial outer side" refers to the direction away from the axis S. The axis S is also the axis of a stator (stator 20) for the magnetic gear electric machine 10, which will be described later.

[0013] The magnetic gear electric machine 10 comprises a housing 17 which rotatably supports a rotating shaft 18 and a stator 20 fixed to the housing 17 .

[0014] The stator 20 includes a stator core 24 extending in the circumferential direction, a plurality of teeth 25 protruding radially inward from the stator core 24, a stator coil 27 wound around the plurality of teeth 25, and a plurality of magnets 5 supported by the plurality of teeth 25. The stator coil 27 is electrically connected to the power system 16. In this example, a surface permanent magnet (SPM) type configuration is adopted in which the plurality of magnets 5 are arranged on the inner circumferential surfaces of the plurality of teeth 25. The SPM type configuration of the stator 20 may be the configuration shown in FIG. 1 in which the magnets 5 are directly attached to the inner circumferential surfaces of the teeth 25, or may be a configuration in which the magnets 5 are attached to the inner circumferential surfaces of the teeth 25 via another member (see FIG. 10).

[0015] The magnetic gear electric machine 10 shown in FIG. 1 further includes a pole piece rotor 30. The pole piece rotor 30 includes an annular body 35 extending along the axis S radially inward of the stator 20, a connecting member 31 connecting one end of the annular body 35 to the rotating shaft 18, and a connecting member 32 connecting the other end of the annular body 35 to the rotating shaft 18. The annular body 35 faces the magnets 5 in the radial direction with an outer air gap G1 therebetween. The annular body 35 also includes a plurality of pole pieces 36 and a plurality of non-magnetic bodies (not shown) alternately arranged along the circumferential direction. The connecting members 31 and 32 extend along the radial direction. The connecting members 31 and 32 illustrated in FIG. 1 are fixed to the rotating shaft 18, and the pole piece rotor 30 is configured to rotate integrally with the rotating shaft 18. The pole pieces 36 may be a plurality of electromagnetic steel plates stacked in the axial direction, or at least one powder magnetic core extending in the axial direction, or a combination of these.

[0016] The magnetic gear electric machine 10 further includes a magnet rotor 40 connected to the rotating shaft 18 between the connecting members 31, 32. The magnet rotor 40 includes a plurality of inner magnets 41 arranged in the circumferential direction radially inside the annular body 35, and a rotor core 42 supporting the inner magnets 41. The rotor core 42 is connected to the rotating shaft 18 via a bearing, and the magnet rotor 40 is configured to rotate relatively to the rotating shaft 18. The magnet rotor 40 faces the annular body 35 in the radial direction with an inner air gap G2 therebetween. In the example of FIG. 1, an SPM type configuration in which the plurality of inner magnets 41 are arranged on the outer circumferential surface of the rotor core 42 is adopted, but an Interior Permanent Magnet (IPM) type configuration in which the plurality of inner magnets 41 are arranged inside the rotor core 42 may also be adopted.

[0017] The magnetic gear electric machine 10 according to one embodiment is a magnetic gear motor that receives power from a power system 16 to drive an external device 9, and its operating principle is as follows: A rotating magnetic field is generated when a current is applied to the stator coil 27, causing the magnet rotor 40 to rotate. The relative positional relationship of the annular body 35 to the multiple inner magnets 41 and the multiple magnets 5 changes in the circumferential direction, and the magnetic flux between the magnet rotor 40 and the stator 20 is modulated by the multiple pole pieces 36, causing the pole piece rotor 30 to rotate. Torque is transmitted from the rotating shaft 18 that rotates together with the pole piece rotor 30 to the external device 9, driving the external device 9.

[0018] The magnetic gear electric machine 10 according to another embodiment is a magnetic gear generator that receives power from an external device 9 and supplies electric power to a power grid 16, and its operating principle is as follows. When the external device 9 drives the rotating shaft 18, the pole piece rotor 30 rotates together with the rotating shaft 18. The relative positional relationship of the annular body 35 to the multiple inner magnets 41 and the multiple magnets 5 changes in the circumferential direction, causing the magnet rotor 40 to rotate. Electromagnetic induction occurs as the pole piece rotor 30 and the magnet rotor 40 rotate, generating a current in the stator coil 27, and power is supplied to the power grid 16.

[0019] If the number of magnetic poles in the pole piece 36 is NL, the number of magnetic pole pairs in the inner magnet 41 is NH, and the number of magnetic pole pairs in the magnet 5 is NS, then NL=NH+NS holds. When this relation holds, the ratio of the rotation speed of the magnet rotor 40 to the pole piece rotor 30 is expressed as NL / NH. In this example, NL / NH is greater than 1, and the magnet rotor 40 functions as a high-speed rotor, and the pole piece rotor 30 functions as a low-speed rotor. The number of magnetic poles NL in the pole piece 36 is less than the number of pole pairs NS in the magnet 5.

[0020] The magnetic gear electric machine 10 of the present disclosure is not limited to the above embodiment. The external device 9 may be connected to a power transmission shaft (not shown) arranged coaxially with the rotating shaft 18. The power transmission shaft and the rotating shaft 18 are not connected to each other. In this case, the connecting member 31 is connected to the rotating shaft 18 via a bearing, and the connecting member 32 is fixed to the power transmission shaft. Furthermore, the rotor core 42 of the magnet rotor 40 is fixed to the rotating shaft 18. Therefore, the magnet rotor 40 rotates integrally with the rotating shaft 18, and the pole piece rotor 30 rotates relative to the rotating shaft 18.

[0021] <Basic configuration of stator 20> 2 is a schematic diagram of a stator 20 according to an embodiment of the present disclosure. The stator 20 includes a cylindrical stator core 24 along the axial direction, a plurality of teeth 25 spaced apart from one another in the circumferential direction inside the stator core 24, and a stator coil 27 provided on the plurality of teeth 25.

[0022] The teeth 25 all extend in the axial direction. Each tooth 25 includes a protruding portion 251 protruding radially inward from the stator core 24, and a tip portion 252 connected to the tip of the protruding portion 251. The stator core 24, the protruding portion 251, and the tip portion 252 are integrally formed of the same soft magnetic material. The protruding portion 251 is shorter than the tip portion 252 in the circumferential direction. The stator coil 27 is provided so as to be wound around the protruding portion 251. A slot opening 201 is formed as a space between two tip portions 252 adjacent to each other in the circumferential direction, and a holding member 209, which may be formed of, for example, a resin member, is disposed in the slot opening 201. The holding member 209 is held by the circumferential ends of the two tip portions 252.

[0023] The stator 20 further includes a plurality of protrusions 50 that protrude radially inward from the plurality of teeth 25. The protrusions 50 illustrated in FIG. 2 include a protrusion 53 that protrudes radially inward from a tip 252 of the tooth 25, and a protrusion 54 that protrudes radially inward from the holding member 209. The protrusion 53 is integrally formed of the same soft magnetic material as the tip 252, and the protrusion 54 is integrally formed of the same resin material as the holding member 209. The protrusions 53 and 54 have the same shape. Note that the protrusion 50 does not need to include the protrusion 54, and the plurality of protrusions 50 may be formed only by the plurality of protrusions 53. In the following description, the protrusions 53 and 54 may be referred to as "protrusions 50" without distinguishing between them.

[0024] The stator 20 further includes a plurality of magnets 5 arranged alternately with the plurality of protrusions 50 in the circumferential direction. The plurality of magnets 5 are arranged radially inward of the plurality of teeth 25, and each magnet 5 is sandwiched between two of the plurality of protrusions 50 that are adjacent to each other in the circumferential direction.

[0025] The magnets 5 include a magnet group (four magnets 5 arranged continuously in the circumferential direction as an example) arranged continuously in the circumferential direction, and the magnet group is arranged in a Halbach array. This Halbach array strengthens the magnetic flux caused by the magnets 5 on the radial inner side of the magnets 5 compared to the radial outer side. The stator 20 of this embodiment employs a configuration in which a plurality of such magnet groups are arranged. In FIG. 2, four magnets 5 included in one magnet group are surrounded by a two-dot chain line J. Each magnet 5 extending in the axial direction is composed of a plurality of permanent magnets 12 stacked in the axial direction (see FIG. 13). In this specification, for convenience of explanation, each magnet 5 extending in the axial direction (see FIG. 2) is counted as one.

[0026] In the following description, the group of magnets arranged in a Halbach array may be referred to as "four magnets 5." In addition, the end face of magnet 5 on one circumferential side is referred to as "one end face 6," and the end face of magnet 5 on the other circumferential side is referred to as "other end face 7." In the example of Fig. 2, the clockwise side is one side, and the counterclockwise side is the other side. Although not shown in the figure, the counterclockwise side may be one side, and the clockwise side may be the other side.

[0027] The four magnets 5 arranged in the Halbach array include a first radial magnet 1 magnetized radially outward, a first circumferential magnet 3 magnetized on one side of the circumferential direction, a second circumferential magnet 4 magnetized on the other side of the circumferential direction, and a second radial magnet 2 magnetized radially inward. The first circumferential magnet 3 is located on one side of the circumferential direction from the first radial magnet 1, the second circumferential magnet 4 is located on the other side of the circumferential direction from the first radial magnet 1, and the second radial magnet 2 is located on the other side of the circumferential direction from the second circumferential magnet 4. The magnetization directions of these four magnets 5 are indicated by thick arrows on each magnet 5, and the end of each magnet 5 on the side in which the arrow points is the N pole. In this example, the magnetization direction components of the first radial magnet 1 and the second radial magnet 2 include only radial components and do not include circumferential components. In addition, the magnetization direction components of the first circumferential magnet 3 and the second circumferential magnet 4 include only circumferential components and do not include radial components. However, the present disclosure is not limited to this, and each magnetization direction component of the first circumferential magnet 3 and the second circumferential magnet 4 may include a radial component in addition to a circumferential component (details will be described later).

[0028] FIG. 3 is a partially enlarged view of FIG. 2. At least one of the one end face 11 (6) and the other end face 111 (7) of the first radial magnet 1 (magnet 5) has a first inclined end face 61. The first inclined end face 61 is inclined so as to approach the center C1 side of the circumferential direction of the first radial magnet 1 as it moves radially inward. In the example of FIG. 3, each of the one end face 11 and the other end face 111 has the first inclined end face 61. As a more specific example, the first radial magnet 1 has a shape that is symmetrical in the circumferential direction. In other words, at least a part of the first radial magnet 1 has a shape in which the circumferential length becomes shorter as it moves radially inward.

[0029] One end face 22 (6) of the second radial magnet 2 (magnet 5) has a second inclined end face 62. The second inclined end face 62 is inclined toward the center C2 side in the circumferential direction of the second radial magnet 2 as it moves toward the inside in the radial direction. As a more specific example, the second radial magnet 2 has a shape that is symmetrical in the circumferential direction. That is, the other end face 222 (7) of the second radial magnet 2 (magnet 5) also has the second inclined end face 62, and at least a part of the second radial magnet 2 has a shape in which the circumferential length becomes shorter as it moves toward the inside in the radial direction. The inclination angle (acute angle) of the second inclined end face 62 with respect to the radial direction is the same as the inclination angle (acute angle) of the first inclined end face 61 with respect to the radial direction. In this example, when viewed in the axial direction, the second radial magnet 2 has the same shape as the first radial magnet 1.

[0030] The other end face 333(7) of the first circumferential magnet 3 (magnet 5) is adjacent to one end face 11 of the first radial magnet 1 in the circumferential direction, and one end face 44(6) of the second circumferential magnet 4 (magnet 5) is adjacent to the other end face 111 of the first radial magnet 1 in the circumferential direction. At least one of the other end face 333 of the first circumferential magnet 3 and the one end face 44 of the second circumferential magnet 4 has a first abutting inclined end face 49. The first abutting inclined end face 49 is inclined toward the center C1 of the first radial magnet 1 as it moves radially inward. In the example of FIG. 3, each of the other end face 333 and the one end face 44 has the first abutting inclined end face 49.

[0031] Additionally, the other end face 444(7) of the second circumferential magnet 4 (magnet 5) has a second abutment inclined end face 48. The second abutment inclined end face 48 inclines toward the center C2 of the second radial magnet 2 as it moves radially inward. The second circumferential magnet 4 has a symmetrical shape in the circumferential direction, and the inclination angle (acute angle) of the second abutment inclined end face 48 relative to the radial direction is the same as the inclination angle (acute angle) of the first abutment inclined end face 49 relative to the radial direction.

[0032] Furthermore, one end face 33 (6) of the first circumferential magnet 3 (magnet 5) also has a second abutting inclined end face 48. The second abutting inclined end face 48 of the first circumferential magnet 3 is inclined toward the center C2 of the second radial magnet 2 located on one side of the first circumferential magnet 3 in the circumferential direction as it moves radially inward. In this example, the shape of the first circumferential magnet 3 is the same as the shape of the second circumferential magnet 4 when viewed in the axial direction.

[0033] Although not an essential component of the present disclosure, the stator 20 illustrated in Fig. 3 includes a plurality of intervening members 90 disposed radially inward of the plurality of protrusions 50. Each intervening member 90 is sandwiched between any two of the plurality of magnets 5 that are adjacent in the circumferential direction. That is, the first abutting inclined end surface 49 according to the example in the figure indirectly abuts against the first inclined end surface 61 of the first radial magnet 1 via the intervening member 90. Also, the second abutting inclined end surface 48 indirectly abuts against the second inclined end surface 62 of the second radial magnet 2 via the intervening member 90.

[0034] The intervening member 90 has a plate shape extending in the axial direction. In some embodiments, a radially outer end of the intervening member 90 abuts against a radially inner end of the protrusion 50. The intervening member 90 is preferably made of an insulating material. The intervening member 90 may be an adhesive or a resin member.

[0035] FIG. 4 is a schematic diagram showing the forces acting on a plurality of magnets 5 according to an embodiment of the present disclosure. Arrows A1 to A4 indicate the magnetic forces that each magnet 5 receives due to the magnetic flux of the other magnets 5. More specifically, arrow A1 indicates the magnitude and direction of the magnetic force received by the first radial magnet 1. Similarly, arrow A2 indicates the direction and magnitude of the magnetic force received by the second radial magnet 2, arrow A3 indicates the direction and magnitude of the magnetic force received by the first circumferential magnet 3, and arrow A4 indicates the direction and magnitude of the magnetic force received by the second circumferential magnet 4. The lengths of the arrows A1 to A4 indicate the magnitude of the magnetic force. The direction and magnitude of these magnetic forces can be determined by simulation. As can be seen from the figure, the largest magnetic force acting inward in the radial direction acts on the first radial magnet 1, and it can be seen that the risk of the first radial magnet 1 coming off the teeth 25 is higher than the risk of the other magnets 5 coming off the teeth 25.

[0036] In this regard, according to the configuration in which the first abutment inclined end surface 49 indirectly abuts against the first inclined end surface 61 via the intervening member 90, the force F acting from the first abutment inclined end surface 49 to the first inclined end surface 61 includes a force R that is a component force directed radially outward. The application of the force R can prevent the first radial magnet 1 from coming off the teeth 25. Thus, the stator 20 is realized that can prevent at least one of the multiple magnets 5 from falling off.

[0037] Of the one end face 11 or the other end face 111 of the first radial magnet 1, the other end face 111 may not have the first inclined end face 61. In this case, the one end face 44 of the second circumferential magnet 4 does not have the first abutting inclined end face 49. Alternatively, the one end face 11 may not have the first inclined end face 61. In this case, the other end face 333 of the first circumferential magnet 3 does not have the first abutting inclined end face 49. In addition, the second radial magnet 2 may not have the second inclined end face 62. Furthermore, the stator 20 may not have the intervening member 90 (details will be described later). In any embodiment, the force R directed in the radial direction generated by the abutment between the first abutting inclined end face 49 and the first inclined end face 61 acts on the first radial magnet 1, so that the above-mentioned advantages are obtained.

[0038] Furthermore, according to a configuration in which one end face 11 and the other end face 111 of the first radial magnet 1 each have a first inclined end face 61, and the first circumferential magnet 3 and the second circumferential magnet 4 each have a first abutment inclined end face 49, a force R directed radially outward is generated at each of the one end face 11 and the other end face 111, thereby further preventing the first radial magnet 1 from coming off the teeth 25.

[0039] 4, a magnetic force directed radially inward also acts on the second radial magnet 2. In this regard, according to a configuration in which the second abutment inclined end surface 48 indirectly abuts on the second inclined end surface 62 via the intervening member 90, a force directed radially outward (not shown) acts on the second radial magnet 2. This makes it possible to prevent the second radial magnet 2 from coming off the teeth 25, thereby realizing a stator 20 that can prevent the multiple magnets 5 from falling off.

[0040] Furthermore, according to a configuration in which the other end face 222 of the second radial magnet 2 has the second inclined end face 62 and the first circumferential magnet 3 located on the other circumferential side of the second radial magnet 2 has the second abutting inclined end face 48, a force directed radially outward is generated at each of the one end face 22 and the other end face 222. This further prevents the second radial magnet 2 from coming off the teeth 25.

[0041] Furthermore, according to the configuration in which the stator 20 includes a plurality of intervening members 90, the intervening members 90 are interposed between two adjacent magnets 5, so that the force transmitted from one of the two adjacent magnets 5 to the other can be suppressed from dispersing. As a more specific example, the first abutting inclined end surface 49 can be in stable surface contact with the first inclined end surface 61 via the intervening members 90, and the force F applied from the first abutting inclined end surface 49 to the first inclined end surface 61 can be suppressed from dispersing. This makes it possible to increase the radial force R acting on the first radial magnet 1, and to suppress the first radial magnet 1 from coming off the plurality of teeth 25. Therefore, the plurality of magnets 5 can be further suppressed from falling off.

[0042] <Relationship between the protrusion 50 and the magnet 5> Returning to FIG. 3, each of the protrusions 50 includes a first end face 51 and a second end face 52, which are both end faces in the circumferential direction. In addition, both the one end face 6 and the other end face 7 of each magnet 5 have a protrusion abutment surface 8 that abuts against the protrusion 50. The protrusion abutment surface 8 is located radially outward from the first inclined end face 61 and the first abutment inclined end face 49. More specifically, the protrusion abutment surface 8 is located radially outward from the first inclined end face 61, the second inclined end face 62, the first abutment inclined end face 49, and the second abutment inclined end face 48. In the example of FIG. 3, the two protrusion abutment surfaces 8 of each magnet 5 abut against the second end face 52 of the protrusion 50 on one side and abut against the first end face 51 of the protrusion 50 on the other side. As a result, each magnet 5 is sandwiched between the two protrusions 50. Note that an intervening member 90 may be interposed between each magnet 5 and the protrusion 50.

[0043] 3, the radial length (dimension M) of each protrusion 50 is half or less, more specifically one-third or less, and even more specifically one-quarter or less, of the radial length of each of the magnets 5. The radial length of each protrusion 50 is one-fifth or more of the radial length of each magnet 5. Furthermore, in this example, the circumferential length (maximum circumferential length) of each protrusion 50 is one-quarter or less of the radial length of each of the magnets 5.

[0044] According to the configuration in which the dimension M is equal to or less than half the radial length of the magnet 5, the radial length of each protrusion 50 can be shortened. As a result, in the assembly process of the stator 20, each of the multiple magnets 5 can be moved from the radial inside to a predetermined assembly position where it is sandwiched between two protrusions 50 (details of the assembly method will be described later). Conventionally, it was necessary to slide the magnet 5 in the axial direction to a predetermined assembly position where it is sandwiched between two fingers (not shown in this paper). However, since the fingers and the magnet 5 generally have a shape that extends in the axial direction, the sliding amount of the magnet 5 is large, and there was a problem that the assembly process of the magnet 5 was time-consuming. In this regard, according to the above configuration, since each magnet 5 is moved in the radial direction, the movement amount of the magnet 5 is reduced, and the assembly of the stator 20 can be improved.

[0045] 3, the first end face 51 and the second end face 52 extend in the radial direction. In other words, the first end face 51 and the second end face 52 are planes parallel to the radial direction. According to the above configuration, the configuration in which the first end face 51 and the second end face 52 extend in the radial direction results in a shape of the protrusion 50 whose circumferential length becomes shorter toward the inside in the radial direction, facilitating the process of moving the magnet 5 from the outside in the radial direction to a predetermined assembly position. This makes it possible to further facilitate the assembly process of the magnet 5.

[0046] In the example of FIG. 3, the projection abutment surface 8 of each magnet 5 is a plane extending in the radial direction. In other words, the projection abutment surface 8 is a plane parallel to the radial direction. According to the above configuration, the radial range in which the projection abutment surface 8 and the projection 50 abut can be widened. As a result, even if the radial length of the projection 50 is short, each magnet 5 is firmly sandwiched between the two projections 50. Therefore, the stator 20 is realized in which the plurality of magnets 5 are prevented from falling off. Furthermore, even if at least one of the first circumferential magnet 3 or the second circumferential magnet 4 has the first abutment inclined end surface 49 and the circumferential magnet has a shape in which the circumferential length increases toward the radial inside, since the projection abutment surface 8 extends in the radial direction, the circumferential magnet can be easily moved to a predetermined assembly position sandwiched between the two projections 50. Therefore, the assembly process of the stator 20 can be further simplified.

[0047] 3, the radial length of the projection abutment surface 8 is less than half, more specifically less than one-third, and even more specifically less than one-quarter of the radial length of each magnet 5. With the above configuration, the distance that the projection abutment surface 8 moves radially while sliding against the projection 50 in the magnet assembly process can be shortened, further simplifying the assembly process of the stator 20.

[0048] <Plate 70> 5A to 5C are schematic diagrams showing a plurality of magnets 5. In FIG. 5A to FIG. 5C, the circumferential direction is illustrated linearly, with the leftmost magnet 5 and the rightmost magnet 5 being adjacent to each other in the circumferential direction. Also, in FIG. 5A to FIG. 5C, the near side of the paper is the radially inner side, and the far side of the paper is the radially outer side. FIG. 5A to FIG. 5C each diagrammatically illustrates a plate 70A (70) according to a first embodiment, a plate 70B (70) according to a second embodiment, and a plate 70C (70) according to a third embodiment.

[0049] As shown in FIG. 5A to FIG. 5C, the plates 70A to 70C (70) extend in the circumferential direction. The plates 70A to 70C (70) are attached to the inner peripheral surface 15 (see FIG. 6) of two or more magnets 5 arranged continuously in the circumferential direction, for example, by adhesive. The two or more magnets 5 arranged continuously include the first radial magnet 1. The plates 70A to 70C (70) are formed of a nonmagnetic material. This makes it possible to suppress the flow of eddy currents in the plates 70, and to suppress iron loss in the stator 20. The plates 70 are preferably made of a nonmagnetic and nonconductive material. Examples of such materials include glass fiber reinforced plastics (GFRP), carbon fiber reinforced plastics (CFRP), and heat-resistant resin.

[0050] In the example of FIG. 5A, a plurality of plates 70A are arranged at equal intervals in the circumferential direction. The magnets 5 to which each plate 70A is attached include a first radial magnet 1 and a second radial magnet 2. In the example of the figure, the number of magnets 5 to which the plate 70A is attached is four or more, more specifically, four. The plate 70B shown in FIG. 5B is attached to the inner circumferential surface 15 of each of the plurality of magnets 5 over the entire circumferential length of the stator core 24 (see FIG. 2). In other words, the plate 70B is a single cylindrical member attached to the inner circumferential surface 15 of each of all the magnets 5 constituting the stator 20. In the example shown, the two plates 70B are attached to one end side and the other end side of the magnet 5 in the axial direction, respectively. Note that one plate 70B may be arranged so that one end in the axial direction of the magnet 5 and one end in the axial direction of the plate 70B are aligned. Similarly, the other plate 70B may be disposed so that the other axial end of the magnet 5 and the other axial end of the plate 70B are aligned.

[0051] The plate 70C shown in FIG. 5C includes a first plate portion 71 attached to the two or more magnets 5 described above, and a second plate portion 72 longer than the first plate portion 71 in the circumferential direction. The first plate portion 71 and the second plate portion 72 are integrally configured, and the second plate portion 72 is connected to one end of the first plate portion 71 in the axial direction. The number of magnets 5 to which the second plate portion 72 is attached is greater than the number of magnets 5 to which the first plate portion 71 is attached. More specifically, the magnets 5 to which the second plate portion 72 is attached include the magnet 5 to which the first plate portion 71 is attached and at least one other magnet 5. In the example of the figure, the second plate portion 72 is attached to all magnets 5 constituting the stator 20, and the number of magnets 5 to which the first plate portion 71 is attached is four. In the example of the figure, a plurality of first plate portions 71 are arranged at equal intervals in the circumferential direction. 5C, the number of first plate portions 71 is not limited to two or more, and may be one. Alternatively, the number of plates 70C is not limited to one, and may be two or more. In this case, a plurality of second plate portions 72 are disposed at equal intervals in the circumferential direction, and a plurality of first plate portions 71 are connected to each of the second plate portions 72.

[0052] Fig. 6 is a schematic diagram of a stator 20 including a plate 70A. The plate 70A shown in Fig. 6 is attached to four magnets 5 (i.e., a first radial magnet 1, a second radial magnet 2, a first circumferential magnet 3, and a second circumferential magnet 4) arranged in a Halbach array, so that the four magnets 5 are integrated together.

[0053] The advantages of having the stator 20 equipped with the plate 70A will be described. The angle between the protruding direction of the protrusions 50 and the horizontal direction tends to differ among the multiple protrusions 50. The smaller the angle between the protruding direction and the horizontal direction, the stronger the radially outward force acting from the protrusions 50 on the magnets 5. The stronger this force is, the greater the contribution it makes to preventing the magnets 5 from falling off.

[0054] To explain a specific example with reference to Figure 6, among the five protrusions 50 that come into contact with any of the four magnets 5 integrated by the attachment of the plate 70A, the angle between the protruding direction and the horizontal direction of the protrusion 50 located on the other circumferential side of the second radial magnet 2 is the smallest. The radially outward force Tr acting on the magnet 5 from this protrusion 50 is larger than the radially outward forces (not shown) acting from the other four protrusions 50, and contributes greatly to preventing the magnet 5 from falling off (suppressing falling off).

[0055] According to the configuration in which the stator 20 includes the plate 70A (70), the four magnets 5 are integrated by the plate 70A, so that the protrusion 50 in FIG. 6 which generates the force Tr can greatly contribute to preventing the second radial magnet 2 as well as the other three magnets 5 from falling off. This realizes a stator 20 which can further prevent the plurality of magnets 5 from falling off. The protrusion 50 protrudes in a direction parallel to the radial direction.

[0056] By the same principle, the above advantages can be obtained when plates 70B and 70C are used instead of plate 70A. For example, when plate 70B is used, all magnets 5 constituting stator 20 are integrated by the attachment of plate 70B, and falling off of magnets 5 is suppressed.

[0057] In addition, according to a configuration in which the magnets 5 attached to the plate 70A include the first radial magnet 1 and the second radial magnet 2, the plate 70A is attached to a plurality of magnets 5, including the first radial magnet 1 and the second radial magnet 2, which are the two magnets 5 that are relatively at high risk of falling off, so that the plurality of magnets 5 can be more reliably prevented from falling off.

[0058] Furthermore, since plate 70C includes first plate portion 71 and second plate portion 72, it is possible to attach second plate portion 72 to a location where the temperature rises slowly, and attach first plate portion 71 to a location where the temperature rises rapidly. This makes it possible to prevent integrated magnet 5 from falling off, and also to prevent damage to plate 70C caused by thermal deformation.

[0059] <Method of assembling the stator 20> A method for assembling the stator 20 will be described with reference to Figs. 6 to 9. In the following description, "step" may be abbreviated as "S". Fig. 7 is a flowchart of a method for assembling the stator 20 according to an embodiment of the present disclosure. Fig. 8 is a schematic diagram showing a radial magnet arrangement step (S11) according to an embodiment of the present disclosure. Fig. 9 is a schematic diagram showing a circumferential magnet arrangement step (S13) according to an embodiment of the present disclosure. The assembly is performed by a worker, a robot arm operated by a worker, or a combination thereof. At the start of the assembly, the holding member 209 is already arranged (see Fig. 9).

[0060] First, a radial magnet arrangement step (S11) is performed in which the first radial magnet 1 and the second radial magnet 2 are arranged between any two protrusions 50 that are consecutively arranged in the circumferential direction. As shown in FIG. 8, the first radial magnet 1 and the second radial magnet 2 are each moved from the inside to the outside in the radial direction to a predetermined assembly position where they are sandwiched between the two protrusions 50. In the example of FIG. 8, when the first radial magnet 1 moves, the two protrusion abutment surfaces 8 slide against the second end surface 52 of the protrusion 50 on one side and the first end surface 51 of the protrusion 50 on the other side, respectively. Thereafter, the first radial magnet 1 reaches the predetermined assembly position. Similarly, when the second radial magnet 2 moves, the two protrusion abutment surfaces 8 slide against the first end surface 51 and the second end surface 52, respectively, and then the second radial magnet 2 reaches the predetermined assembly position.

[0061] During the execution of S11, the first radial magnet 1 and the second radial magnet 2 that have reached the assembly position are subjected to magnetic forces that move toward each other in the circumferential direction (arrow W). This is because the radially inner end of the first radial magnet 1 has an S pole, and the inner end of the second radial magnet 2 has an N pole. Furthermore, the outer end of the first radial magnet 1 has an N pole, and the outer end of the second radial magnet 2 has an S pole. As a result, each protrusion 50 receives a force that faces the circumferential direction from the first radial magnet 1 and the second radial magnet 2. In this regard, according to a configuration in which the radial length of the protrusion 50 is half or less than the radial length of the magnet 5, it is possible to reduce the bending moment generated in the protrusion 50, and to suppress damage to the protrusion 50.

[0062] When S11 is completed (i.e., when the first radial magnets 1 and the second radial magnets 2 are arranged at equal intervals over the entire circumferential length of the stator 20), the bending moment generated in each protrusion 50 almost disappears. This is because the magnetic forces acting on the first radial magnets 1 and the second radial magnets 2 cancel each other out in the circumferential direction.

[0063] After completion of S11, an assembly jig (not shown) may be temporarily arranged to fix the first radial magnet 1 and the second radial magnet 2 at the assembly position. As one example, the assembly jig presses the first radial magnet 1 and the second radial magnet 2 from the inside to the outside in the radial direction.

[0064] Next, a circumferential magnet arrangement step (S13) is performed in which the first circumferential magnet 3 and the second circumferential magnet 4 are arranged between the other two protrusions 50 that are consecutively arranged in the circumferential direction. As shown in Fig. 9, the first circumferential magnet 3 and the second circumferential magnet 4 are each moved from the inner side to the outer side in the radial direction to a predetermined assembly position where they are sandwiched between the two protrusions 50. The details are the same as in S11.

[0065] Next, an intervening member disposing step (S15) is performed in which an intervening member 90 is disposed between two circumferentially adjacent magnets 5. As an example, in S15, the intervening member 90 is filled as an adhesive into the space formed between the two adjacent magnets 5, and then a hardening process such as a heat treatment is performed. This results in the intervening member 90 being disposed (see FIG. 6).

[0066] Next, a plate arrangement step (S17) is performed in which plate 70A (70) is arranged on inner circumferential surfaces 15 of two or more consecutively arranged magnets 5. Plate 70A is attached to inner circumferential surfaces 15 via, for example, an adhesive (not shown). This completes the method for assembling stator 20 (see FIG. 6).

[0067] <Another embodiment (first example)> 10 is a schematic diagram showing a stator 20A according to another embodiment. The stator 20A includes a cylindrical body 99 fitted into the inner circumferential surfaces of the plurality of tip portions 252, and the above-mentioned plurality of protrusions 53 (50) are integrally formed with the cylindrical body 99. The cylindrical body 99 is made of, for example, a non-magnetic material. More specifically, the cylindrical body 99 is formed of CFRP or GFRP.

[0068] The multiple protrusions 50 protrude radially inward from the cylindrical body 99. The protrusion 50 illustrated in Fig. 10 is formed integrally with the cylindrical body 99 and protrudes radially inward beyond the multiple teeth 25. The multiple protrusions 50 are connected to the multiple teeth 25 via the cylindrical body 99.

[0069] Furthermore, no intervening member 90 (see FIG. 3) is disposed between the multiple magnets 5 constituting the stator 20A. Therefore, the first abutment inclined end surface 49 of each of the first circumferential magnet 3 and the second circumferential magnet 4 directly abuts against the first inclined end surface 61 of the first radial magnet 1. Even in this case, the force acting from the first abutment inclined end surface 49 to the first inclined end surface 61 includes a force directed radially outward. The action of this force can prevent the first radial magnet 1 from coming off the teeth 25.

[0070] In addition, the second inclined end face 62 of the second radial magnet 2 also directly contacts the second inclined contact end face 48 of the second circumferential magnet 4. Even in this case, the force acting from the second inclined contact end face 48 to the second inclined end face 62 includes a force directed radially outward. The action of this force can prevent the second radial magnet 2 from coming off the teeth 25.

[0071] The stator 20A may further include the above-mentioned plate 70. Although the plate 70A is illustrated in Fig. 10, the stator 20A may also include plates 70B and 70C.

[0072] <Another embodiment (second example)> A radial magnet arrangement step (S11 in FIG. 7) according to another embodiment will be described with reference to FIG. 11. After the first radial magnet 1 is arranged between the two protrusions 50 in S11, a step of bending the two protrusions 50 toward the center C1 of the first radial magnet 1 may be performed. In this case, as an example, the magnet 5 moving from the inside to the outside in the radial direction may not slide against the protrusions 50.

[0073] The shape of the protrusions 50 after this step is performed (i.e., the shape of the protrusions 50 in the lower part of FIG. 11) will be described. In the following description, the pair of protrusions 50 that sandwich the first radial magnet 1 in the circumferential direction may be referred to as a pair of first protrusions 55.

[0074] Each first protrusion 55 includes a first base end side extension portion 551, a first tip end side extension portion 552 located radially inward from the first base end side extension portion 551, and a first bent portion 553 connected to the first base end side extension portion 551 and the first tip end side extension portion 552. The first base end side extension portion 551 and the first tip end side extension portion 552 extend along the radial direction, and the first bent portion 553 bends toward the center C1 of the first radial magnet 1 as it moves radially inward. At least one of the pair of first tip end side extension portions 552 abuts against the first inclined end surface 61 of the first radial magnet 1. In the example of FIG. 11, the first inclined end surface 61 is formed on each of the one end surface 11 and the other end surface 111 of the first radial magnet 1, and the pair of first tip end side extension portions 552 abut against the pair of first inclined end surfaces 61, respectively. In addition, the first base end side extending portion 551 in this example faces the first radial magnet 1 in the circumferential direction with a gap M1 therebetween.

[0075] According to the above configuration, since the angle (acute angle) between the first tip side extending portions 552 and the radial direction can be made small by providing the first bent portions 553, the pair of first tip side extending portions 552 can firmly sandwich the first radial magnet 1. Therefore, it is possible to prevent the first radial magnet 1 from falling off. In addition, the circumferential distance between the two protrusions 50 is relatively long before the bending process is performed to form the first bent portion 553. In this example, the first radial magnet 1 can be moved (inserted) between the two protrusions 50 before the bending process is performed, which facilitates the step (S11) of arranging the first radial magnet 1. At least one of the first end face 51 or the second end face 52, which are both end faces in the circumferential direction of each first protrusion 55 (protrusion 50), may be inclined with respect to the radial direction so as to move toward the center of the first protrusion 55 as it moves toward the inside in the radial direction. In this case, the step (S11) of moving the first radial magnet 1 to between the two first protrusions 55 before the bending process is performed becomes even easier. Furthermore, the radially inner end surface of each first protrusion 55 may be a curved surface that is convex toward the inside in the radial direction. Even in this case, the first radial magnet 1 moving toward between the two protrusions 50 is prevented from being hindered by the radially inner end surface of the first protrusion 55, so that the step (S11) of arranging the first radial magnet 1 can be further facilitated.

[0076] The configuration of the first protrusions 55 described above may be applied to a pair of protrusions 50 that circumferentially sandwich the second radial magnet 2 shown in Fig. 12. In the following description, the pair of protrusions 50 that circumferentially sandwich the second radial magnet 2 may be referred to as a pair of second protrusions 56.

[0077] Each second protrusion 56 includes a second base end side extension portion 561, a second tip end side extension portion 562 located radially inward from the second base end side extension portion 561, and a second bent portion 563 connected to the second base end side extension portion 561 and the second tip end side extension portion 562. The second base end side extension portion 561 and the second tip end side extension portion 562 extend along the radial direction, and the second bent portion 563 bends toward the center C2 of the second radial magnet 2 as it moves radially inward. At least one of the pair of second tip end side extension portions 562 abuts against the second inclined end surface 62 of the second radial magnet 2. In the example of FIG. 12, the second inclined end surface 62 is formed on each of the one end surface 22 and the other end surface 222 of the second radial magnet 2, and the pair of second tip end side extension portions 562 abut against the pair of second inclined end surfaces 62, respectively. In addition, the second base end side extending portion 561 in this example faces the second radial magnet 2 in the circumferential direction with a gap M2 therebetween.

[0078] According to the above configuration, the pair of second tip side extending portions 562 can firmly hold the second radial magnet 2, and the second radial magnet 2 can be prevented from falling off.

[0079] The radial length of at least one of the first protrusions 55 and the second protrusions 56 may be less than half the radial length of the magnet 5. An intervening member 90 (see FIG. 6) may be disposed between the magnet 5 and the protrusions 50 (i.e., the first protrusions 55 and the second protrusions 56) shown in FIG. 11 and FIG. 12, or a plate 70 (see FIG. 6) may be disposed on the magnet 5 shown in the same figures. The advantages obtained by employing at least one of these configurations have already been described, and therefore detailed description will be omitted.

[0080] <Another embodiment (third example)> A stator 20B according to another embodiment will be described with reference to Fig. 13. The stator 20B includes a pressing member 80. The number of pressing members 80 in this example is the same as the number of magnets 5 that constitute the stator 20.

[0081] Each magnet 5 constituting the stator 20B includes a plurality of permanent magnets 12 stacked in the axial direction. That is, each of the first radial magnet 1, the second radial magnet 2, the first circumferential magnet 3, and the second circumferential magnet 4 includes a plurality of permanent magnets 12. The pressing member 80 presses the inner circumferential surface 15 of each permanent magnet 12 radially outward. An example of a more specific configuration is as follows.

[0082] The permanent magnet 12 includes a first permanent magnet 121 located closest to a first side in the axial direction and a second permanent magnet 122 located closest to a second side opposite the first side, the first permanent magnet 121 having a first surface 121A facing the first side, and the second permanent magnet 122 having a second surface 122A facing the second side.

[0083] Stator 20B further includes a first reel 91 provided on first surface 121A and a second reel 92 provided on second surface 122A. The first reel 91 includes a first joint portion joined to the first surface 121A and a first columnar portion provided at the first joint portion. The first columnar portion extends linearly along the circumferential direction and faces the first surface 121A in the axial direction with a gap therebetween. The first columnar portion may be fixed to the first joint portion or may be rotatably provided at the first joint portion. Also, a first cylindrical portion may be provided instead of the first columnar portion. The second reel 92 includes a second joint portion joined to the second surface 122A and a second columnar portion provided at the second joint portion. The second columnar portion extends linearly along the circumferential direction and faces the second surface 122A in the axial direction with a gap therebetween. The second columnar portion may be fixed to the second joint portion or may be rotatably provided at the second joint portion. Also, a second cylindrical portion may be provided instead of the second columnar portion.

[0084] The pressing member 80 in this example is a wire 89 that binds together the first reel 91, the second reel 92, and each of the plurality of permanent magnets 12. The wire 89 is made of CFRP or GFRP.

[0085] The wire 89 includes a first winding portion 81 wound around a first reel 91, a first axially extending portion 83 pulled out from the first reel 91, a bent portion 85 connected to the first axially extending portion 83 and bent by contacting the second reel 92, a second axially extending portion 84 connected to the bent portion 85, and a second winding portion 82 connected to the second axially extending portion 84 and wound around the first reel 91. Note that, for ease of viewing the drawings, the second winding portion 82 is illustrated apart from the first reel 91, but the second winding portion 82 is actually wound around the first cylindrical portion of the first reel 91. For the same reason, the first axially extending portion 83 is illustrated apart from the inner circumferential surface 15 of the permanent magnet 12, but the first axially extending portion 83 actually contacts the inner circumferential surface 15.

[0086] The first winding portion 81 is wound around the first cylindrical portion of the first reel 91. The first axially extending portion 83 extends in the axial direction and abuts against the inner circumferential surface 15 of each of the permanent magnets 12 from the radially inner side. More specifically, a groove (not shown) extending in the axial direction is provided on the inner circumferential surface 15 of each of the permanent magnets 12, and the first axially extending portion 83 is disposed inside the groove. The first axially extending portion 83 presses each of the inner circumferential surfaces 15 radially outward. The bent portion 85 abuts against approximately half of the outer circumferential surface of the second cylindrical portion of the second reel 92. The bent portion 85 according to another example may be wound around the second reel 92. The second axially extending portion 84 extends in the axial direction radially outward from the first axially extending portion 83. In this example, a hole is formed in each permanent magnet 12, and the second axially extending portion 84 is disposed inside the hole. In another example, the second axially extending portion 84 may be disposed so as to abut against the outer circumferential surface of the tooth 25 (more specifically, the outer circumferential surface of the tip portion 252 shown in FIG. 10).

[0087] According to the configuration in which the stator 20B includes the pressing member 80, each permanent magnet 12 is pressed radially outward, so that at least one of the multiple permanent magnets 12 constituting each magnet 5 can be prevented from falling off. In particular, according to the configuration in which the pressing member 80 presses the multiple permanent magnets 12 of the first radial magnet 1, the first radial magnet 1, which has a relatively high risk of falling off, is pressed, so that at least one of the multiple permanent magnets 12 constituting the first radial magnet 1 can be prevented from falling off. Similarly, according to the configuration in which the pressing member 80 presses the multiple permanent magnets 12 constituting the second radial magnet 2, the second radial magnet 2, which has the second highest risk of falling off after the first radial magnet 1, is pressed, so that at least one of the multiple permanent magnets 12 constituting the second radial magnet 2 can be prevented from falling off. The pressing member 80 is not limited to the wire 89. For example, it may be a rubber band arranged to bind the stator core 24 and the multiple permanent magnets 12. The above advantages can be obtained in this embodiment as well. Also, at least one of the pressing member 80 pressing the first circumferential magnet 3 and the pressing member 80 pressing the second circumferential magnet 4 does not need to be provided. That is, the number of pressing members 80 may be less than the number of magnets 5 constituting the stator 20.

[0088] Furthermore, according to a configuration in which the pressing member 80 is the wire 89 that binds the first reel 91, the second reel 92, and each of the multiple permanent magnets 12, the second axially extending portion 84 presses each of the multiple permanent magnets 12 radially outward due to the tension of the wire 89 that is generated by winding the wire 89 around at least one of the first reel 91 or the second reel 92. This makes it possible to prevent at least one of the multiple permanent magnets 12 that constitute each magnet 5 from falling off. The stator 20B may include the plate 70 described above. In this case, the first axially extending portion 83 described above may be disposed in a groove formed on the inner surface of the plate 70. The first reel 91 and the second reel 92 may be provided on the teeth 25. In this case, the second axially extending portion 84 extends in the axial direction radially outward of the tip portion 252 (see FIG. 2). In any of the embodiments, the above advantages can be obtained.

[0089] <Another embodiment (fourth example)> A stator 20C (20) according to another embodiment will be described with reference to Fig. 14. More specifically, the shapes of the first circumferential magnets 3 and the second circumferential magnets 4 constituting the stator 20C will be described.

[0090] The other end surface 333 of the first circumferential magnet 3 and the one end surface 44 of the second circumferential magnet 4 each have a first abutting inclined end surface 49. The other end surface 333 and the one end surface 44 each further have a first extending surface 131 and a first connecting surface 141. The first extending surface 131 extends from the outside to the inside in the radial direction along the protrusion 53 (50) on the radial outside of the first abutting inclined end surface 49. The first extending surface 131 directly abuts against the protrusion 53. The first connecting surface 141 extends along the circumferential direction on the radial inside of the protrusion 53 (50). The first connecting surface 141 may extend parallel to the circumferential direction, or may extend inclined with respect to the circumferential direction as shown in the figure. Furthermore, the first connection surface 141 connects to an inner end 131a in the radial direction of the first extension surface 131 and an outer end 49a in the radial direction of the first abutment inclined end surface 49. At least a part of the circumferential range in which the first connection surface 141 is arranged is included in the circumferential range in which the protrusion 53 (50) that abuts against the first extension surface 131 is arranged.

[0091] In the example of FIG. 14, an intervening member 90 is interposed between the other end face 333 of the first circumferential magnet 3 and the first inclined end face 61 of the first radial magnet 1, and between the one end face 44 of the second circumferential magnet 4 and the first inclined end face 61 of the first radial magnet 1, but the present disclosure is not limited thereto. For example, the other end face 333 may directly abut the first inclined end face 61, or the one end face 44 may directly abut the first inclined end face 61. Furthermore, either the other end face 333 of the first circumferential magnet 3 or the one end face 44 of the second circumferential magnet 4 may not have the first abutting inclined end face 49, the first extending surface 131, or the first connecting surface 141. Furthermore, at least one of the one end face 33 of the first circumferential magnet 3 and the other end face 444 of the second circumferential magnet 4 may have a first abutting inclined end face 49, a first extending surface 131, and a first connecting surface 141.

[0092] According to the above configuration, since the first connecting surface 141 is interposed between the first abutting inclined end surface 49 and the first extending surface 131, at least one of the other end surface 333 of the first circumferential magnet 3 and the one end surface 44 of the second circumferential magnet 4 is raised in the circumferential direction. This makes it possible to increase the amount of magnets in the same space of at least one of the first circumferential magnet 3 and the second circumferential magnet 4.

[0093] <Another embodiment (fifth example)> A stator 20D according to another embodiment will be described with reference to Fig. 15. More specifically, the shape of the first radial magnets 1 constituting the stator 20D will be described.

[0094] Both the first end face 51 and the second end face 52 have a first inclined end face 61. Both the first end face 51 and the second end face 52 further have a second extending face 132 and a second connecting face 142. The second extending face 132 extends from the outside to the inside in the radial direction along the protrusion 53 (50) on the radial outside of the first inclined end face 61. The second extending face 132 directly abuts against the protrusion 53. The second connecting face 142 extends along the circumferential direction on the radial inside of the protrusion 53 (50). The second connecting face 142 may extend parallel to the circumferential direction, or may extend inclined with respect to the circumferential direction as shown in the figure. Furthermore, the second connecting face 142 connects the inner end 132a of the second extending face 132 in the radial direction and the outer end 61a of the first inclined end face 61 in the radial direction. At least a portion of the circumferential range in which the second connecting surface 142 is disposed is included in the circumferential range in which the protrusion 53 (50) that abuts against the second extending surface 132 is disposed.

[0095] 15, an intervening member 90 is interposed between the first radial magnet 1 and the first circumferential magnet 3, and between the first radial magnet 1 and the second circumferential magnet 4, but the present disclosure is not limited to this. For example, the two first inclined end faces 61 may directly abut the first circumferential magnet 3 and the second circumferential magnet 4, respectively. Furthermore, either the first end face 51 or the second end face 52 may not have the first inclined end face 61, the second extension surface 132, and the second connection surface 142.

[0096] According to the above configuration, since the second connecting surface 142 is interposed between the first inclined end surface 61 and the second extending surface 132, at least one of the first end surface 51 and the second end surface 52 is raised in the circumferential direction. This makes it possible to increase the amount of magnets in the same space of the first radial magnet 1.

[0097] It is also possible to apply both the other embodiment according to the fourth example and the other embodiment according to the fifth example to the stator 20. For example, when only the one end face 33 of the one end face 33 or the other end face 333 of the first circumferential magnet 3 has the first abutting inclined end face 49, the first extending face 131, and the first connecting face 141, only the first end face 51 of the first end face 51 or the second end face 52 of the first radial magnet 1 may have the first inclined end face 61, the second extending face 132, and the second connecting face 142.

[0098] <Another embodiment (sixth example)> The magnet group arranged in the Halbach array may be eight magnets 5 arranged continuously in the circumferential direction. In this case, the arrangement is a so-called dual Halbach array, and the magnetization direction components of the first circumferential magnet 3 and the second circumferential magnet 4 adjacent to the first radial magnet 1 in the circumferential direction each have not only a circumferential component but also a radial component.

[0099] <Summary> The contents described in the above-mentioned embodiments can be understood, for example, as follows.

[0100] 1) A stator (20, 20A, 20B, 20C, 20D) according to an embodiment of the present disclosure is a stator core (24) including a plurality of teeth (25) arranged at intervals in a circumferential direction based on an axis line (S); A plurality of magnets (5) including a magnet group (for example, four magnets 5 arranged continuously in the circumferential direction) arranged radially inside the plurality of teeth, the magnet group being arranged in a Halbach array; A stator comprising: The magnet group includes: A first radial magnet (1) magnetized radially outward; a first circumferential magnet (3) located on one side of the first radial magnet in the circumferential direction and magnetized on the one side; a second circumferential magnet (4) located on the other side of the circumferential direction relative to the first radial magnet and magnetized to the other side; Including, At least one of the one end face (11) and the other end face (111) in the circumferential direction of the first radial magnet has a first inclined end face (61) that inclines toward the center (C1) of the first radial magnet in the circumferential direction as it moves toward the inside in the radial direction, At least one of the other end face (333) in the circumferential direction of the first circumferential magnet or the one end face (44) in the circumferential direction of the second circumferential magnet has a first abutting inclined end face (49) that inclines toward the center of the first radial magnet in the circumferential direction as it moves toward the inside in the radial direction and abuts against the first inclined end face.

[0101] According to the above configuration 1), the first inclined contact end surface directly or indirectly contacts the first inclined end surface, so that a force directed radially outward acts on the first radial magnet. This makes it possible to prevent the first radial magnet from coming off the teeth. Thus, a stator is realized that can prevent at least one of the magnets from falling off.

[0102] 2) In some embodiments, the stator according to 1) above, Each of the one end surface and the other end surface of the first radial magnet has the first inclined end surface, The other end face of the first circumferential magnet and the one end face of the second circumferential magnet each have the first abutment inclined end surface.

[0103] According to the above configuration 2), a force acting radially outward is generated at each of the one end face and the other end face of the first radial magnet, which further prevents the first radial magnet from coming off the multiple teeth.

[0104] 3) In some embodiments, the stator according to 1) or 2) above, The magnet group further includes a second radial magnet (2) located on the other side in the circumferential direction relative to the second circumferential magnet and magnetized inward in the radial direction, One end surface (22) of the second radial magnet in the circumferential direction has a second inclined end surface (62) that is inclined toward the center (C2) of the second radial magnet in the circumferential direction as it moves toward the inside in the radial direction, The other end face (444) of the second circumferential magnet in the circumferential direction has a second abutting inclined end face (48) that inclines toward the center of the second radial magnet as it moves inward in the radial direction and abuts against the second inclined end face.

[0105] According to the above configuration 3), the second inclined contact end surface directly or indirectly contacts the second inclined end surface, so that a force directed radially outward acts on the second radial magnet. This makes it possible to prevent the second radial magnet from coming off the multiple teeth. This realizes a stator that can prevent the multiple magnets from falling off.

[0106] 4) In some embodiments, the stator according to any one of 1) to 3) above, The magnet further includes a plurality of protrusions (50) that protrude radially inward beyond the plurality of teeth and are arranged alternately with the plurality of magnets in the circumferential direction, Among the plurality of protrusions, two adjacent protrusions in the circumferential direction sandwich one of the plurality of magnets in the circumferential direction, The radial length of each of the plurality of protrusions is equal to or less than half the radial length of each of the plurality of magnets.

[0107] According to the configuration of 4) above, the radial length of each of the multiple protrusions can be shortened. As a result, in the assembly process of the stator, each of the multiple magnets can be moved from the radial inside to a predetermined assembly position where it is sandwiched between two protrusions. Conventionally, it was necessary to slide the magnet in the axial direction to a predetermined assembly position where it is sandwiched between two fingers. However, since the fingers and magnets generally have a shape that extends in the axial direction, the sliding amount of the magnet is large, and there was a problem that the assembly process of the magnet was time-consuming. In this regard, according to the above configuration, since each magnet is moved in the radial direction, the movement amount of the magnet can be reduced, and the assembly of the stator can be improved.

[0108] 5) In some embodiments, the stator according to 4) above, A first end face (51) and a second end face (52) in the circumferential direction of each of the plurality of protrusions both extend in the radial direction.

[0109] According to the above configuration 5), the projection has a shape in which the circumferential length becomes shorter toward the inside in the radial direction, which makes it easy to move the magnet from the outside in the radial direction to the specified assembly position. As a result, the magnet assembly process can be further simplified.

[0110] 6) In some embodiments, the stator according to 4) or 5) above, Each of the plurality of magnets has one end face (6) and the other end face (7) in the circumferential direction, a projection abutment surface (8) located radially outward of the first inclined end surface and the first abutment inclined end surface and abutting against the projection; The protrusion abutment surface extends in the radial direction.

[0111] According to the above configuration 6), since the protrusion abutment surface extends along the radial direction, the radial range in which the protrusion abutment surface abuts against the protrusion can be widened. As a result, even if the radial length of the protrusion is short, each magnet is firmly sandwiched between the two protrusions. Therefore, a stator in which multiple magnets are prevented from falling off is realized. Furthermore, even if at least one of the first circumferential magnet and the second circumferential magnet has a first abutment inclined end surface, since the protrusion abutment surface extends in the radial direction, the circumferential magnet can be easily moved to a predetermined assembly position where it is sandwiched between the two protrusions, further simplifying the assembly process of the stator.

[0112] 7) In some embodiments, the stator according to 6) above, The radial length of each of the protrusion abutment surfaces is equal to or less than half the radial length of each of the plurality of magnets.

[0113] According to the above configuration 7), the distance that the projection abutment surface slides over against the projection in the magnet installation process can be shortened, further simplifying the stator assembly process.

[0114] 8) In some embodiments, the stator according to any one of 1) to 3) above, The magnet further includes a plurality of protrusions (50) that protrude radially inward beyond the plurality of teeth and are arranged alternately with the plurality of magnets in the circumferential direction, Among the plurality of protrusions, two adjacent protrusions in the circumferential direction sandwich one of the plurality of magnets in the circumferential direction, The plurality of protrusions include a pair of first protrusions (55) that sandwich the first radial magnet, The pair of first protrusions each have a first bent portion (553) bent toward the center (C1) of the first radial magnet.

[0115] According to the above configuration 8), the pair of first protrusions can more firmly sandwich the first radial magnet, thereby making it possible to prevent the first radial magnet from falling off. In addition, the circumferential distance between the two protrusions before the bending process to form the first bent portion is relatively long. According to the configuration of 8) above, the first radial magnet can be moved (inserted) to between the two protrusions before the bending process is performed, which makes it possible to facilitate the process of arranging the first radial magnet 1.

[0116] 9) In some embodiments, the stator according to any one of 4) to 8) above, The magnet further includes a plurality of intervening members (90) that are arranged radially inward of the plurality of protrusions, and each intervening member is sandwiched between two of the plurality of magnets that are adjacent to each other in the circumferential direction.

[0117] According to the configuration of 9) above, since an intervening member is interposed between two adjacent magnets, it is possible to suppress dispersion of the force transmitted from one of the two adjacent magnets to the other. As a more specific example, the first abutment inclined end surface can be in stable surface contact with the first inclined end surface via the intervening member, and it is possible to suppress dispersion of the force applied from the first abutment inclined end surface to the first inclined end surface. This makes it possible to increase the radial force acting on the first radial magnet, and it is possible to suppress the first radial magnet from coming off the multiple teeth. Thus, a stator that can further suppress the multiple magnets from falling off is realized.

[0118] 10) In some embodiments, the stator according to any one of 4) to 9) above, The magnet further includes a plate (70) extending in the circumferential direction and attached to an inner circumferential surface (15) of each of the two or more magnets including the first radial magnet.

[0119] The angle between the protrusion direction and the horizontal direction of the multiple protrusions tends to be different for each of the multiple protrusions. The smaller the angle between the protrusion direction and the horizontal direction, the stronger the radial force acting from the protrusion on the magnet, making it less likely for the magnet to fall off. In this regard, according to the configuration of 10) above, the protrusion with the smallest angle among the three or more protrusions that contact the two or more magnets integrated by the plate contributes greatly to preventing the two or more integrated magnets from falling off. This realizes a stator that can further prevent the multiple magnets from falling off.

[0120] 11) In some embodiments, the stator according to 10) above, The magnet group further includes a second radial magnet (2) located on the other side in the circumferential direction relative to the second circumferential magnet and magnetized inward in the radial direction, The magnets to which the plate is attached include the first radial magnet and the second radial magnet.

[0121] According to the above configuration 11), the plate is attached to multiple magnets, including the first radial magnet and the second radial magnet, which are two magnets that are relatively at risk of falling off, so that the multiple magnets can be more reliably prevented from falling off.

[0122] 12) In some embodiments, the stator according to any one of 10) or 11) above, The plate is a single member attached to the inner circumferential surface of each of the plurality of magnets over the entire circumferential length of the stator core.

[0123] According to the above configuration 12), all the magnets are integrated by the plate, and the magnets are prevented from falling off.

[0124] 13) In some embodiments, the stator according to any one of 10) to 12) above, The plate is a first plate portion (71) attached to the two or more magnets; a second plate portion (72) connected to one axial end of the first plate portion and longer than the first plate portion in the circumferential direction; Includes The magnets to which the second plate portion is attached include the two or more magnets to which the first plate portion is attached and at least one other magnet.

[0125] According to the above configuration 13), it is possible to attach the second plate part to the place where the temperature rises slowly, and the first plate part to the place where the temperature rises rapidly. This makes it possible to prevent the integrated magnet from falling off, and also to prevent the plate from being damaged due to thermal deformation.

[0126] 14) In some embodiments, the stator according to any one of 1) to 13) above, The first radial magnet includes a plurality of permanent magnets (12) stacked in the axial direction, The stator further includes a pressing member (80) that presses the inner circumferential surface of each permanent magnet outward in the radial direction.

[0127] According to the above configuration 14), the first radial magnet, which has a relatively high risk of falling off, is pressed radially outward, thereby preventing at least one of the multiple permanent magnets constituting the first radial magnet from falling off.

[0128] 15) In some embodiments, the stator according to 14) above, The plurality of permanent magnets are a first permanent magnet (121) located on the first side in the axial direction; a second permanent magnet (122) located on the second most side in the axial direction; Including, The stator includes: a first reel (91) provided on a first surface (121A) of the first permanent magnet facing the first side; a second reel (92) provided on a second surface (121B) of the second permanent magnet facing the second side; Further equipped with The pressing member is a wire (89) that binds the first reel, the second reel, and each of the plurality of permanent magnets.

[0129] According to the above configuration 15), the permanent magnets are pressed radially outward by tension generated by winding the wire around at least one of the first reel and the second reel, thereby making it possible to prevent at least one of the permanent magnets constituting the magnet from falling off.

[0130] 16) In some embodiments, the stator according to any one of 1) to 15) above, The magnet further includes a plurality of protrusions (50) that protrude radially inward beyond the plurality of teeth and are arranged alternately with the plurality of magnets in the circumferential direction, Among the plurality of protrusions, two adjacent protrusions in the circumferential direction sandwich one of the plurality of magnets in the circumferential direction, At least one of the other end surface in the circumferential direction of the first circumferential magnet and the one end surface in the circumferential direction of the second circumferential magnet is a first extending surface (131) extending along the protrusion radially outward from the first inclined contact end surface; a first connection surface (141) extending along the circumferential direction radially inward of the protrusion and connecting an inner end of the first extension surface in the radial direction and an outer end of the first abutment inclined end surface in the radial direction; has.

[0131] According to the configuration of 16) above, since the first connecting surface is interposed between the first inclined end surface and the first extending surface, at least one of the other end surface of the first circumferential magnet and one end surface of the second circumferential magnet is raised in the circumferential direction, thereby increasing the amount of magnet in the same space of at least one of the first circumferential magnet and the second circumferential magnet.

[0132] 17) In some embodiments, the stator according to any one of 1) to 16) above, The magnet further includes a plurality of protrusions (50) that protrude radially inward beyond the plurality of teeth and are arranged alternately with the plurality of magnets in the circumferential direction, Among the plurality of protrusions, two adjacent protrusions in the circumferential direction sandwich one of the plurality of magnets in the circumferential direction, At least one of the one end surface and the other end surface in the circumferential direction of the first radial magnet is a second extending surface (132) extending along the protrusion radially outward from the first inclined end surface; a second connection surface (142) extending along the circumferential direction radially inward of the protrusion and connecting an inner end of the second extension surface in the radial direction and an outer end of the first inclined end surface in the radial direction; has.

[0133] According to the above configuration 17), since the second connecting surface is interposed between the first inclined end surface and the second extending surface, at least one of the first end surface and the second end surface is raised in the circumferential direction, thereby increasing the amount of magnets in the same space of the first radial magnet.

[0134] 18) The magnetic gear electric machine (10) according to at least one embodiment of the present disclosure comprises: A stator (20, 20A, 20B) according to any one of 1) to 13) above; a pole piece rotor (30) including a plurality of pole pieces (36) arranged in the circumferential direction on the radially inner side of the stator; a magnet rotor (40) including an inner magnet (41) disposed radially inward of the plurality of magnetic pole pieces; Equipped with.

[0135] According to the configuration 18) above, the same effects as those of 1) above can be obtained.

[0136] 19) A method for assembling a stator (20, 20A, 20B, 20C, 20D) according to at least one embodiment of the present disclosure, a stator core (24) including a plurality of teeth (25) arranged at intervals in a circumferential direction based on an axis line (S); A plurality of magnets (5) including a magnet group (for example, four magnets 5 arranged continuously in the circumferential direction) arranged radially inside the plurality of teeth, the magnet group being arranged in a Halbach array; a plurality of protrusions (50) that protrude radially inward beyond the plurality of teeth and are arranged alternately with the plurality of magnets in the circumferential direction; A method for manufacturing a stator comprising: The magnet group includes: A first radial magnet (1) magnetized radially outward; a first circumferential magnet (3) located on one side of the first radial magnet in the circumferential direction and magnetized on the one side; a second circumferential magnet (4) located on the other side of the circumferential direction relative to the first radial magnet and magnetized to the other side; Including, At least one of the one end face (11) and the other end face (111) in the circumferential direction of the first radial magnet has a first inclined end face (61) that inclines toward the center (C1) of the first radial magnet in the circumferential direction as it moves toward the inside in the radial direction, At least one of the other end surface (333) in the circumferential direction of the first circumferential magnet and the one end surface (44) in the circumferential direction of the second circumferential magnet has a first abutting inclined end surface (49) that inclines toward the center side in the circumferential direction of the first radial magnet as it moves toward the inside in the radial direction and abuts against the first inclined end surface, The method for assembling the stator includes the steps of: A step (S11) of disposing the first radial magnet and the second radial magnet between any two of the protrusions that are consecutively arranged in the circumferential direction; After performing the step of arranging the first radial magnets, the method includes a step (S13) of arranging the first circumferential magnets and the second circumferential magnets between other two of the protrusions that are aligned consecutively in the circumferential direction.

[0137] According to the configuration 19) above, the same effects as those of 1) above can be obtained. [Explanation of symbols]

[0138] 1: First radial magnet 2: Second radial magnet 3: First circumferential magnet 4:Second circumferential magnet 5: Magnet 6,11,22,33,44: One end surface 7,111,222,333,444 :Other end surface 8:Protrusion contact surface 10: Magnetic gear electric machine 12: Permanent magnet 15: Inner surface 20, 20A, 20B, 20C, 20D: Stator 24: Stator core 25: Teeth 30: Pole piece rotor 36 :Magnetic pole piece 40: Magnet rotor 41: Inner magnet 48: 2nd abutting inclined end surface 49: First contact inclined end surface 50,53,54 :Protrusion 51: 1st end surface 52: 2nd end face 55: 1st protrusion 56:Second protrusion 61: 1st inclined end surface 62: 2nd inclined end surface 70, 70A, 70B, 70C: Plate 71: First plate section 72: Second plate section 80: Pressing member 81: Volume 1 82: Volume 2 83: First axial extension part 84: Second axial extension part 85: Bend 89: Wire 90:Intervening member 91: 1st reel 92: Second reel 99: Cylindrical body 111: Other end face 121: First permanent magnet 121A: First surface 122: Second permanent magnet 122A: Second surface 201: Slot opening 209: Holding member 251: Protrusion 252: Tip portion 551: First base-end side extending portion 552: First tip-end side extending portion 553: First bending portion 561: Second base-end side extending portion 562: Second tip-end side extending portion 563: Second bending portion C1: Center C2: Center S: Axis

Claims

1. a stator core including a plurality of teeth spaced apart in a circumferential direction relative to an axis; A plurality of magnets including a magnet group that is continuously arranged in the circumferential direction radially inward of the plurality of teeth, the magnets being arranged in a Halbach array; A stator comprising: The magnet group includes: a first radial magnet magnetized radially outward; a first circumferential magnet located on one side of the first radial magnet in the circumferential direction and magnetized to the one side; a second circumferential magnet located on the other side of the circumferential direction relative to the first radial magnet and magnetized to the other side; Including, At least one of the one end face and the other end face in the circumferential direction of the first radial magnet has a first inclined end face that inclines toward the center side of the circumferential direction of the first radial magnet as it moves toward the inside in the radial direction, At least one of the other end surface in the circumferential direction of the first circumferential magnet and one end surface in the circumferential direction of the second circumferential magnet has a first abutting inclined end surface that inclines toward the center side in the circumferential direction of the first radial magnet as it moves toward the inside in the radial direction and abuts against the first inclined end surface. Stator.

2. Each of the one end surface and the other end surface of the first radial magnet has the first inclined end surface, The other end surface of the first circumferential magnet and the one end surface of the second circumferential magnet each have the first abutment inclined end surface. The stator according to claim 1 .

3. the magnet group further includes a second radial magnet located on the other side in the circumferential direction relative to the second circumferential magnet and magnetized inward in the radial direction, One end surface of the second radial magnet in the circumferential direction has a second inclined end surface that is inclined toward the center side of the second radial magnet in the circumferential direction as it approaches the inside in the radial direction, The other end surface of the second circumferential magnet in the circumferential direction is inclined toward the center side of the second radial magnet as it moves toward the inside in the radial direction, and has a second abutting inclined end surface that abuts against the second inclined end surface.

3. A stator according to claim 1 or 2.

4. The magnet further includes a plurality of protrusions that protrude radially inward beyond the plurality of teeth and are arranged alternately with the plurality of magnets in the circumferential direction, two of the plurality of protrusions adjacent to each other in the circumferential direction sandwich one of the plurality of magnets in the circumferential direction; The radial length of each of the plurality of protrusions is equal to or less than half the radial length of each of the plurality of magnets.

3. A stator according to claim 1 or 2.

5. A first end surface and a second end surface in the circumferential direction of each of the plurality of protrusions both extend in the radial direction.

5. The stator according to claim 4.

6. Each of the plurality of magnets has one end surface and the other end surface in the circumferential direction, a protrusion abutment surface that is located radially outward of the first inclined end surface and the first abutment inclined end surface and abuts against the protrusion; The protrusion abutment surface extends in the radial direction.

5. The stator according to claim 4.

7. The radial length of each of the projection abutment surfaces is equal to or less than half the radial length of each of the plurality of magnets.

7. The stator according to claim 6.

8. The magnet further includes a plurality of protrusions that protrude radially inward beyond the plurality of teeth and are arranged alternately with the plurality of magnets in the circumferential direction, two of the plurality of protrusions adjacent to each other in the circumferential direction sandwich one of the plurality of magnets in the circumferential direction; The plurality of protrusions include a pair of first protrusions sandwiching the first radial magnet therebetween, Each of the pair of first protrusions has a first bent portion that is bent toward the center of the first radial magnet.

3. A stator according to claim 1 or 2.

9. the magnets are arranged radially inward of the projections, the intermediate members being sandwiched between two of the magnets adjacent to each other in the circumferential direction.

5. The stator according to claim 4.

10. The magnet further includes a plate extending in the circumferential direction and attached to an inner circumferential surface of each of the two or more magnets, including the first radial magnet.

5. The stator according to claim 4.

11. the magnet group further includes a second radial magnet located on the other side in the circumferential direction relative to the second circumferential magnet and magnetized inward in the radial direction, The magnets to which the plate is attached include the first radial magnet and the second radial magnet. The stator of claim 10.

12. The plate is a single member attached to the inner circumferential surface of each of the plurality of magnets over the entire length of the stator core in the circumferential direction. The stator of claim 10.

13. The plate is A first plate portion attached to the two or more magnets; a second plate portion connected to one axial end of the first plate portion and longer than the first plate portion in the circumferential direction; Includes The magnets to which the second plate portion is attached include the two or more magnets to which the first plate portion is attached and at least one other magnet. The stator of claim 10.

14. The first radial magnet includes a plurality of permanent magnets stacked in the axial direction, The stator further includes a pressing member that presses an inner circumferential surface of each permanent magnet outward in the radial direction.

3. A stator according to claim 1 or 2.

15. The plurality of permanent magnets are A first permanent magnet located on the first side in the axial direction; a second permanent magnet located on the second most side in the axial direction; Including, The stator includes: a first reel provided on a first surface of the first permanent magnet facing the first side; a second reel provided on a second surface of the second permanent magnet facing the second side; Further equipped with The pressing member is a wire that binds the first reel, the second reel, and each of the plurality of permanent magnets.

15. A stator according to claim 14.

16. The magnet further includes a plurality of protrusions that protrude radially inward beyond the plurality of teeth and are arranged alternately with the plurality of magnets in the circumferential direction, two of the plurality of protrusions adjacent to each other in the circumferential direction sandwich one of the plurality of magnets in the circumferential direction; At least one of the other end surface in the circumferential direction of the first circumferential magnet and the one end surface in the circumferential direction of the second circumferential magnet is a first extending surface extending along the protrusion at a radially outer side of the first contact inclined end surface; a first connection surface that extends along the circumferential direction radially inward of the protrusion and that is connected to an inner end of the first extension surface in the radial direction and an outer end of the first abutment inclined end surface in the radial direction; have 3. A stator according to claim 1 or 2.

17. The magnet further includes a plurality of protrusions that protrude radially inward beyond the plurality of teeth and are arranged alternately with the plurality of magnets in the circumferential direction, two of the plurality of protrusions adjacent to each other in the circumferential direction sandwich one of the plurality of magnets in the circumferential direction; At least one of the one end surface and the other end surface in the circumferential direction of the first radial magnet is a second extending surface extending along the protrusion radially outward from the first inclined end surface; a second connection surface that extends along the circumferential direction radially inward of the protrusion and that is connected to an inner end of the second extension surface in the radial direction and an outer end of the first inclined end surface in the radial direction; have 3. A stator according to claim 1 or 2.

18. A stator according to claim 1 or 2; a pole piece rotor including a plurality of pole pieces arranged in the circumferential direction on the radially inner side of the stator; a magnet rotor including an inner magnet arranged radially inward of the plurality of magnetic pole pieces; 1. A magnetic gear electric machine comprising:

19. a stator core including a plurality of teeth spaced apart in a circumferential direction relative to an axis; A plurality of magnets including a magnet group continuously arranged in the circumferential direction radially inward of the plurality of teeth, the magnet group being arranged in a Halbach array; a plurality of protrusions that protrude radially inward beyond the plurality of teeth and are arranged alternately with the plurality of magnets in the circumferential direction; A method for assembling a stator comprising: The magnet group includes: a first radial magnet magnetized radially outward; a first circumferential magnet located on one side of the first radial magnet in the circumferential direction and magnetized to the one side; a second circumferential magnet located on the other side of the circumferential direction relative to the first radial magnet and magnetized to the other side; Including, At least one of the one end face and the other end face in the circumferential direction of the first radial magnet has a first inclined end face that inclines toward the center side of the circumferential direction of the first radial magnet as it moves toward the inside in the radial direction, At least one of the other end surface in the circumferential direction of the first circumferential magnet and the one end surface in the circumferential direction of the second circumferential magnet has a first abutting inclined end surface that inclines toward the center side in the circumferential direction of the first radial magnet as it moves toward the inside in the radial direction and abuts against the first inclined end surface, The method for assembling the stator includes the steps of: disposing the first radial magnet between any two of the protrusions that are consecutively arranged in the circumferential direction; and after performing the step of arranging the first radial magnet, a step of arranging the first circumferential magnet and the second circumferential magnet between other two of the protrusions that are consecutively arranged in the circumferential direction. How to assemble the stator.

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