Stator magnet assembly device, stator magnet assembly method, and manufacturing method of stator

Abstract

A stator magnet assembly apparatus is used to assemble magnets onto a stator core. The stator magnet assembly apparatus includes: a holding mechanism comprising a holding member formed of a magnetic material, the holding member having a holding lower surface for attracting and holding an upper surface of the magnet by magnetic force; a moving mechanism for moving the holding member so that the magnet held by the holding member is positioned at a predetermined position facing the magnet mounting surface of the stator core with a gap in the vertical direction; and a separating mechanism for separating the magnet held at the predetermined position from the holding lower surface toward the magnet mounting surface.

Description

Technical Field

[0001] This disclosure relates to a stator magnet assembly apparatus, a stator magnet assembly method, and a stator manufacturing method.

[0002] This application claims priority based on Japanese Patent Application No. 2024-003676 filed with the Japan Patent Office on January 15, 2024, the contents of which are incorporated herein by reference. Background Technology

[0003] Previously, stators assembled in magnetic gear electromechanical equipment were known. For example, the stator disclosed in Patent Document 1 includes a stator core extending circumferentially. Multiple magnets (stator magnets) are arranged circumferentially on multiple teeth provided on the stator core.

[0004] Existing technical documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2023-042363 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] The assembly of the stator magnets into the stator core is preferably carried out in a more efficient manner.

[0008] The purpose of this disclosure is to provide a stator magnet assembly apparatus, a stator magnet assembly method, and a stator manufacturing method that can efficiently assemble magnets into a stator core.

[0009] Methods for solving problems

[0010] The stator magnet assembly apparatus of at least one embodiment of this disclosure is a stator magnet assembly apparatus for assembling magnets onto a stator core, the stator magnet assembly apparatus comprising: A retaining mechanism includes a retaining member formed of a magnetic material, the retaining member having a retaining lower surface for attracting and retaining the upper surface of the magnet by magnetic force; A moving mechanism for moving the holding member so that the magnet held by the holding member is positioned at a predetermined position facing the magnet mounting surface of the stator core with a gap in the vertical direction; and A separation mechanism is used to separate the magnet, which is held at the predetermined position, from the holding lower surface toward the magnet mounting surface.

[0011] The stator magnet assembly method of at least one embodiment of this disclosure is a stator magnet assembly method for assembling a magnet onto a stator core, and the stator magnet assembly method comprises the following steps: The holding step involves attracting and holding the aforementioned magnet to the holding lower surface of the holding member formed of magnetic material; The moving step involves moving the holding member to position the held magnet at a predetermined location facing the magnet mounting surface of the stator core, spaced apart vertically; and The separation step involves separating the magnet held by the aforementioned holding member from the aforementioned holding lower surface toward the aforementioned magnet mounting surface.

[0012] The stator manufacturing method of at least one embodiment of this disclosure is a stator manufacturing method that assembles a plurality of the above-described magnets onto the stator core by repeatedly performing the above-described stator magnet assembly method, thereby assembling the stator core along its entire circumferential length. The aforementioned magnets include: The first radial magnet is magnetized radially outward from the stator core. The second radial magnet is magnetized toward the inner side in the aforementioned radial direction; The first circumferential magnet is magnetized to one side of the stator core in the circumferential direction; and The second circumferential magnet is magnetized to the other side of the aforementioned circumferential direction. The above-mentioned stator manufacturing method includes the following steps: The radial magnet arrangement step involves alternately arranging the first radial magnet and the second radial magnet at intervals along the circumferential direction of the stator core; and In the circumferential magnet arrangement step, after the radial magnet arrangement step, the first circumferential magnet and the second circumferential magnet are arranged at intervals in the circumferential direction. The first circumferential magnet is arranged on one side of the first radial magnet in the circumferential direction and on the other side of the second radial magnet in the circumferential direction. The second circumferential magnet is arranged on the other side of the first radial magnet and on one side of the second radial magnet in the circumferential direction.

[0013] Invention Effects

[0014] According to this disclosure, a stator magnet assembly apparatus, a stator magnet assembly method, and a stator manufacturing method can be provided that can efficiently assemble a stator core. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a magnetic gear electromechanical device according to one embodiment.

[0016] Figure 2 This is a schematic diagram of the stator in one embodiment.

[0017] Figure 3 This is a schematic diagram of the stator magnet assembly device according to the first embodiment.

[0018] Figure 4 This is a schematic diagram of the moving mechanism according to the first embodiment.

[0019] Figure 5 This is a schematic diagram of the holding mechanism and the separating mechanism of the first embodiment.

[0020] Figure 6 This is a schematic cross-sectional view of the holding mechanism and the separating mechanism of the first embodiment.

[0021] Figure 7 This is a schematic diagram of a rotating support mechanism according to one embodiment.

[0022] Figure 8 This is a flowchart of an assembly method for a magnet (stator magnet) according to one embodiment.

[0023] Figure 9A This is a schematic diagram illustrating a method for assembling a magnet according to one embodiment.

[0024] Figure 9B It means to continue Figure 9A A schematic diagram of the assembly method of the magnet.

[0025] Figure 9C It means to continue Figure 9B A schematic diagram of the assembly method of the magnet.

[0026] Figure 9D It means to continue Figure 9C A schematic diagram of the assembly method of the magnet.

[0027] Figure 9E It means to continue Figure 9D A schematic diagram of the assembly method of the magnet.

[0028] Figure 10A This is a schematic diagram of the separation mechanism of the first variant.

[0029] Figure 10B This is a schematic diagram of the separation mechanism in the second variation.

[0030] Figure 11 This is a schematic diagram of the stator magnet assembly device according to the second embodiment.

[0031] Figure 12A This is a schematic diagram of the moving steps in the second embodiment.

[0032] Figure 12B This is a schematic diagram of the separation steps in the second embodiment.

[0033] Figure 12C This is a schematic diagram showing the magnet after the separation step in the second embodiment.

[0034] Figure 13 This is a schematic diagram illustrating a method for manufacturing a stator according to one embodiment.

[0035] Figure 14 This is a schematic diagram illustrating the radial magnet configuration steps of one embodiment.

[0036] Figure 15 This is a schematic diagram illustrating the circumferential magnet configuration steps of one embodiment. Detailed Implementation

[0037] Hereinafter, several embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc., of the constituent components described as embodiments or shown in the drawings are not intended to limit the scope of the present disclosure, but are merely illustrative examples.

[0038] For example, expressions such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" indicate a relative or absolute configuration, which not only strictly indicate such a configuration, but also indicate a state of relative displacement by angle or distance with tolerance or to the extent that the same function can be obtained.

[0039] For example, expressions such as "same," "equal," and "homogeneous" that indicate the state of equality of things not only indicate a state of strict equality, but also indicate a state of difference where there is a tolerance or a degree of difference in the ability to obtain the same function.

[0040] For example, the description of shape, such as quadrilateral or cylindrical shape, not only refers to the shape in a strict geometric sense, but also to the shape that includes concave or convex parts or chamfered parts within the range that can achieve the same effect.

[0041] On the other hand, expressions such as “possessing,” “containing,” or “having” a constituent element are not exclusive expressions that exclude the existence of other constituent elements.

[0042] In addition, sometimes the same reference numerals are used to label the same structures and the descriptions are omitted.

[0043] <Basic Structure of Magnetic Gear Electric Machinery 10>

[0044] Reference Figure 1 Here is an overview of the magnetic gear electromechanical device 10, which includes a stator 20. The magnetic gear electromechanical device 10 has a rotating shaft 18 that connects to an external device 9. Figure 1 In order to simplify the drawings, the rotation shaft 18 is depicted as a solid shaft component, but this disclosure is not limited thereto. The rotation shaft 18 may be implemented by multiple shaft components, and the multiple shaft components may also include shaft components formed in a cylindrical shape.

[0045] In the following description, "axial" refers to the axial direction of the axis S of the rotating shaft 18, "circumferential" refers to the circumferential direction based on the axis S, and "radial" refers to the radial direction based on the axis S. "Inner radial direction" refers to the direction closer to the axis S, and "outer radial direction" refers to the direction farther from the axis S. Furthermore, the axis S is the center of the stator 20. Also, in this example, the axial direction is horizontal, while the radial direction includes both vertical and vertical directions.

[0046] The magnetic gear electromechanical device 10 includes a housing 17 that supports a rotating shaft 18 for rotatability and a stator 20 fixed to the housing 17. The stator 20 includes a stator core 24, a plurality of stator coils 27 disposed on the stator core 24, and a plurality of magnets (stator magnets) 5 disposed on the inner circumferential surface of the stator core 24. The stator coils 27 are electrically connected to an electrical system 16.

[0047] The magnetic gear electromechanical device 10 also includes a magnetic pole rotor 30. The magnetic pole rotor 30 includes: an annular body 35 extending radially inward along axis S from the stator 20; and a pair of connecting members 31 connecting the annular body 35 to the rotating shaft 18. The annular body 35 comprises a plurality of magnetic pole pieces 36 and a plurality of non-magnetic bodies (not shown) arranged alternately along the circumference. Each connecting member 31 is fixed to the rotating shaft 18, and the magnetic pole rotor 30 is configured to rotate integrally with the rotating shaft 18.

[0048] The magnetic gear electromechanical device 10 also includes a magnetic rotor 40 connected to a rotating shaft 18 between a pair of connecting parts 31. The magnetic rotor 40 includes a plurality of inner magnets 41 arranged circumferentially on the inner side radially inward of 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 bearings, and the magnetic rotor 40 is configured to rotate relative to the rotating shaft 18.

[0049] One embodiment of the magnetic gear electromechanical device 10 is a magnetic gear motor that receives power from the power system 16 to drive an external device 9. Its operating principle is as follows: The magnetic rotor 40 rotates due to the rotating magnetic field generated by the energization of the stator coil 27. The relative position of the annular body 35 with respect to the plurality of inner magnets 41 and the plurality of magnets 5 varies circumferentially. The magnetic flux between the magnetic rotor 40 and the stator 20 is modulated by the plurality of magnetic pole pieces 36, causing the magnetic pole piece rotor 30 to rotate. Torque is transmitted from the rotating shaft 18, which rotates together with the magnetic pole piece rotor 30, to the external device 9, thereby driving the external device 9.

[0050] The magnetic gear electromechanical device 10 of another embodiment is a magnetic gear generator that obtains power from an external device 9 and supplies power to the power system 16. Its operating principle is as follows: The external device 9 drives the rotating shaft 18, and the magnetic pole rotor 30 rotates together with the rotating shaft 18. The relative positional relationship of the annular body 35 with respect to the plurality of inner magnets 41 and the plurality of magnets 5 changes in the circumferential direction, and the magnetic rotor 40 rotates. Through electromagnetic induction that occurs along with the rotation of the magnetic pole rotor 30 and the magnetic rotor 40, a current is generated in the stator coil 27, and power is supplied to the power system 16.

[0051] exist Figure 1 The illustration shows a configuration in which the rotating shaft 18 rotates together with the magnetic pole rotor 30, but this disclosure is not limited to this. For example, a configuration in which the rotating shaft 18 rotates together with the magnetic rotor 40 may also be used. In this case, the magnetic pole rotor 30 is connected to the rotating shaft 18 via a bearing.

[0052] <Basic Structure of Stator 20>

[0053] Figure 2 This is a schematic diagram of a stator 20 according to one embodiment of the present disclosure. The stator core 24 of the stator 20 is formed of a soft magnetic material. The stator core 24 includes a circumferentially extending base 23 and a plurality of teeth 25 projecting radially inward from the base 23. The plurality of teeth 25 are arranged at intervals in the circumferential direction, and the aforementioned plurality of stator coils 27 are disposed on the plurality of teeth 25. Each tooth 25 has a front end portion 252, and a clamping member 209 is disposed in an opening formed between two adjacent front end portions 252. For example, the clamping member 209, which may be formed of a resin component, may be held by the two front end portions 252.

[0054] The stator 20 also has a plurality of protrusions 6 that protrude radially inwards from the plurality of teeth 25. Figure 2 The protrusion 6 illustrated includes a protrusion 7 that projects radially inward from the front end 252 of the tooth 25 and a protrusion 8 that projects radially inward from the clamping member 209. The protrusion 7 is integrally formed of the same soft magnetic material as the front end 252, and the protrusion 8 is integrally formed of the same resin material as the clamping member 209. The protrusions 7 and 8 have the same shape. Alternatively, the clamping member 209 is not a necessary component of the stator 20, and the protrusion 6 may not include the protrusion 8. In this case, the plurality of protrusions 6 may consist only of the plurality of protrusions 7. In the following description, when referring to protrusions 7 and 8 without distinction, they are sometimes referred to as "protrusion 6".

[0055] The stator 20 also includes a plurality of magnets 5 arranged alternately with the plurality of protrusions 6 in the circumferential direction. The plurality of magnets 5 are arranged radially inward from the plurality of teeth 25, and each magnet 5 is held between two adjacent protrusions 6 in the circumferential direction. Alternatively, an adhesive may be sandwiched between the magnets 5 and the teeth 25; in this case, the protrusions 6 may not be provided. Furthermore, an adhesive may also be present between two adjacent magnets 5 in the circumferential direction.

[0056] The array of multiple magnets 5 is a Hellbeck array. In this example, the Hellbeck array enhances the magnetic flux induced by the magnets 5 radially inside the multiple magnets 5 than radially outside the array. The Hellbeck array is implemented by circumferentially arranging a group of four magnets 5 magnetized in mutually different directions. As an example, the four magnets 5 constituting this group are... Figure 2 The double-dotted line J encloses the magnet. Furthermore, each magnet 5 extending along the axial direction is composed of multiple permanent magnets (not shown) stacked axially. For ease of explanation in this specification, each such axially extending magnet 5 is counted as one.

[0057] The four magnets 5 constituting the magnet group include: a first radial magnet 1 magnetized outward in the radial direction, a second radial magnet 2 magnetized inward in the radial direction, a first circumferential magnet 3 magnetized on one side in the circumferential direction, and a second circumferential magnet 4 magnetized on the other side in the circumferential direction. The first circumferential magnet 3 is located on the circumferential side of the first radial magnet 1, and the second circumferential magnet 4 is located on the other side in the circumferential direction of the first radial magnet 1. The magnetization directions of these four magnets 5 are indicated by thick arrows in each magnet 5, with the end of each magnet 5 pointing in the direction of the arrow being the N pole.

[0058] In the following description, when referring to the first radial magnet 1, the second radial magnet 2, the first circumferential magnet 3, and the second circumferential magnet 4 without distinguishing between them, it is sometimes referred to as "magnet 5".

[0059] <Stator magnet assembly apparatus 50A according to the first embodiment>

[0060] An overview of the stator magnet assembly device 50 used in the manufacture of stator 20 is provided. The stator magnet assembly device 50 is configured to assemble magnets 5 onto stator core 24. Figure 3 This is a schematic diagram showing the stator magnet assembly device 50A (50) according to the first embodiment. The stator 20 is formed into a cylindrical shape centered on the axis S, but only a part of it is shown in this figure. In addition, for the sake of simplicity, the illustration of the multiple teeth 25 is omitted in this figure.

[0061] In the following description, sometimes the inner circumferential surface of the stator core 24 (in other words, the inner circumferential surface of each of the plurality of teeth 25) located on the axis S of the stator 20 (refer to) Figure 1 The surface located on the lower side is called the "magnet mounting surface 29".

[0062] like Figure 3 As illustrated, the stator magnet assembly device 50A (50) includes: a holding mechanism 55A (55) for holding the magnet 5; a separating mechanism 70A (70) for separating the magnet 5 from the holding mechanism 55A; and a moving mechanism 60A (70) for moving the holding mechanism 55A together with the separating mechanism 70A. Figure 3 In this embodiment, the holding mechanism 55A, the separating mechanism 70A, and the moving mechanism 60A are all illustrated as part of the first embodiment. The holding mechanism 55B, the separating mechanism 70B, and the moving mechanism 60B of the second embodiment will be described later.

[0063] like Figure 5 As shown, the holding mechanism 55A includes a holding member 53 formed of a magnetic material. The lower holding surface 54 of the holding member 53 attracts and holds the upper surface 5a of the magnet 5 by magnetic force. More specifically, when the magnet 5 approaches the holding member 53, the holding member 53 is magnetized by the magnet 5. The magnet 5 is attracted to the lower holding surface 54 by the magnetic attraction generated between the magnet 5 and the holding member 53. The lower holding surface 54 can directly abut against the upper surface 5a (not shown) or indirectly abut against the upper surface 5a via other components such as the spacer 66 described later. In addition, the upper surface 5a is the radially inner end face of the magnet 5.

[0064] The retaining member 53 is an L-shaped plate extending axially. More specifically, the retaining member 53 has a horizontal plate 531 extending horizontally and a vertical plate 532 erected upward from the end of the horizontal plate 531. The retaining lower surface 54 is the lower surface of the horizontal plate 531. Alternatively, the retaining member 53 may also be a column (not shown) extending axially, and the retaining lower surface 54 may also be the lower surface of the column.

[0065] exist Figure 5 The separation mechanism 70A illustrated herein is configured to separate the magnet 5 held by the retaining lower surface 54 downwards. Several means may be employed as a means of separating the magnet 5, as described later. Details of these means will be described later. The separation mechanism 70A is mounted on the retaining member 53.

[0066] like Figure 3 As shown, the moving mechanism 60A supports the holding mechanism 55A so that it can move. Thus, the holding mechanism 55A moves together with the separating mechanism 70A. The moving mechanism 60A moves the holding member 53 of the holding mechanism 55A, and the magnet 5 held by the holding member 53 reaches a predetermined position.

[0067] Here, the predetermined position refers to the position of magnet 5 facing magnet mounting surface 29 with a gap in the vertical direction (see reference). Figure 9C The magnet 5, located at a predetermined position, faces the magnet mounting surface 29 with a gap along its entire axial length. The magnet 5, located at the predetermined position, is held on the retaining lower surface 54 by the magnetic attraction between the retaining member 53 and the magnet 5. Additionally, the magnet 5, located at the predetermined position, can also be attracted by the magnetic attraction from the stator core 24, which is made of a soft magnetic material. However, when the magnet 5 is positioned at the predetermined position, the attraction caused by the retaining member 53 is greater than the attraction caused by the stator core 24.

[0068] The magnet 5, held by the holding member 53, is separated from the holding lower surface 54 toward the magnet mounting surface 29 at a predetermined position by the separation mechanism 70A. The separation mechanism 70A can separate the magnet 5 directly abutting against the holding lower surface 54 from the holding lower surface 54, or it can separate the magnet 5 indirectly abutting against the holding lower surface 54 with the spacer 66 between them. If the magnet 5 at the predetermined position gets closer to the magnet mounting surface 29, the magnetic attraction between the magnet 5 and the stator core 24 increases, and the magnet 5 is attracted to and abuts against the magnet mounting surface 29.

[0069] According to the above structure, after the moving mechanism 60A moves the holding member 53 to position the magnet 5 in a predetermined position, the separating mechanism 70A separates the magnet 5 from the holding lower surface 54 downward toward the magnet mounting surface 29, thereby attracting the magnet 5 to the stator core 24 and mounting it on the magnet mounting surface 29. Since the magnet 5 can be mounted on the magnet mounting surface 29 without stopping, a stator magnet assembly device 50A (50) that can efficiently assemble the magnet 5 onto the stator core 24 is realized.

[0070] Hereinafter, the moving mechanism 60A (60), the separating mechanism 70A (70), and the holding mechanism 55A (55) of the first embodiment will be described in detail in sequence.

[0071] <Moving mechanism 60A of the first embodiment>

[0072] Reference Figure 3 , Figure 4 The moving mechanism 60A (60) of the first embodiment will be described in detail below. Additionally, in Figure 4 The diagram of retaining mechanism 55A is omitted in the text.

[0073] The moving mechanism 60A includes: a pair of struts 64 spaced apart axially, an axial guide 65A (65) supported by the pair of struts 64, and a slider 69 mounted on the axial guide 65A. The axial guide 65A extends axially through the inside of the stator 20, and for example, is located at a point relative to the axis S (refer to axis S) of the stator 20. Figure 4 The slider 69 is positioned slightly below the axial guide 65A.

[0074] The retaining member 53 of the retaining mechanism 55A is connected to the sliding member 69. Therefore, the retaining member 53, supported by the axial guide 65A, can move axially together with the separating mechanism 70A.

[0075] like Figure 4 As shown, the axial guide 65A (65) has: a first guide portion 61 disposed within the axial range of the stator core 24 and a second guide portion 62 disposed at a position away from the axial range of the stator core 24 on one side axially upward. The first guide portion 61 and the second guide portion 62 are integrally constructed of the same material, and the sliding member 69 (see reference) Figure 3 It moves linearly between the first guide portion 61 and the second guide portion 62. In addition, the axial length (dimension L2) of the second guide portion 62 is greater than the axial length (dimension L1) of the first guide portion 61.

[0076] return Figure 3 The moving mechanism 60A may further include a vertical moving mechanism 67 for moving the retaining member 53 in the vertical direction. The vertical moving mechanism 67 has a base 161 connected to the sliding member 69, a vertical track 162 disposed on the base 161 and extending in the vertical direction, and a movable support 163 connected to the vertical track 162 via a bearing. The movable support 163 is movable along the vertical track 162, and therefore can move relative to the sliding member 69 in the vertical direction. The retaining member 53 is fixed to the movable support 163 by a fastening member (not shown). Therefore, the retaining member 53 can move axially together with the sliding member 69 and can move vertically together with the movable support 163.

[0077] Magnet 5 maintains lower surface 54 (reference) Figure 5 The installation is performed as follows. First, with the retaining member 53 supported by the second guide 62, the magnet 5 is installed on the retaining lower surface 54 (see reference). Figure 3At this time, the retaining member 53 is located, for example, at the upper end of its movable range in the vertical direction (wherein, this disclosure is not limited to the retaining member 53 being located at the upper end of its movable range, as long as the retaining member 53 is positioned such that the magnet 5 is located above the magnet mounting surface 29). After the magnet 5 is installed, the retaining member 53 moves to the other side in the axial direction, and the magnet 5 moves to directly above the magnet mounting surface 29. Then, the retaining member 53 moves downward, and the magnet 5 reaches a predetermined position.

[0078] In this example, the retaining member 53 moves axially and vertically by the operator manually pressing it. However, this disclosure is not limited to this; the moving mechanism 60A may also include at least one drive source (not shown). The drive source is implemented by an electric motor, solenoid, cylinder, hydraulic cylinder, or a combination thereof.

[0079] According to the structure of the moving mechanism 60A including the axial guide 65A, the magnet 5 can be mounted on the holding member 53 at a position axially away from a predetermined position. Then, the holding member 53 can move stably axially to position the magnet 5 in the predetermined position. Therefore, the installation operation of the magnet 5 onto the magnet mounting surface 29 can be easily performed. Alternatively, one of the pair of pillars 64 of the moving mechanism 60A may not be provided. In this case, the axial guide 65A is cantilevered by a single pillar 64. Even in this case, the above-mentioned technical advantages can still be obtained.

[0080] With the structure that the axial length of the second guide portion 62 is greater than or equal to the axial length of the first guide portion 61, the magnet 5 can be mounted on the retaining lower surface 54 while the retaining member 53 is supported by the second guide portion 62. Since the magnet 5 is mounted at a position offset to one side from the axial direction of the stator core 24, the magnetic attraction between the magnet 5 and the stator core 24 does not hinder the mounting of the magnet 5. Therefore, the mounting operation of the magnet 5 can be performed easily.

[0081] According to the structure of the moving mechanism 60A, which includes the up-and-down moving mechanism 67, the magnet 5 can be mounted on the retaining lower surface 54 at a position above and away from the magnet mounting surface 29. The magnetic attraction between the magnet 5 and the stator core 24 does not hinder the installation of the magnet 5, thus the installation operation of the magnet 5 can be performed easily.

[0082] Alternatively, the moving mechanism 60A may not include the up-and-down moving mechanism 67. In this case, the retaining member 53 is directly mounted on the sliding member 69 (see reference). Figures 9A-9E ).

[0083] <Separation mechanism 70A of the first embodiment>

[0084] Reference Figure 5 , Figure 6 The separation mechanism 70A (70) of the first embodiment will be described in detail below. The separation mechanism 70A includes a force application unit 80 for separating the magnet 5 held by the holding member 53 from the holding lower surface 54 toward the magnet mounting surface 29.

[0085] The force-applying unit 80 has a force-applying rod 82 extending axially in the vertical direction. The force-applying rod 82 is inserted into a retaining hole 57 in the retaining member 53. Here, the retaining hole 57 is a through hole extending through the retaining member 53 in the vertical direction; in this example, an opening is formed on the retaining lower surface 54, which serves as the lower surface of the horizontal plate 531. In this example, force-applying rods 82 are inserted into a plurality of retaining holes 57 arranged at axial intervals. The force-applying rod 82 is configured to shift in the vertical direction.

[0086] More specifically, the retaining hole 57 is a threaded hole with an inner circumferential surface 58 having internal threads, and the force-applying rod 82 has a threaded shaft portion 83 that engages with the internal threads of the inner circumferential surface 58. The threaded shaft portion 83 can also be the shaft portion of a screw 37, such as a wing screw. When the operator rotates the screw 37, the force-applying rod 82 moves downward. When the lower end of the threaded shaft portion 83 protrudes downward from the retaining hole 57, it directly or indirectly abuts against the magnet 5. When the screw 37 rotates further, the threaded shaft portion 83 applies a downward force to the magnet 5, and the magnet 5 moves away from the retaining lower surface 54 toward the magnet mounting surface 29. After detaching from the magnet mounting surface 29, the magnet 5 is mounted on the magnet mounting surface 29 by the magnetic attraction force received from the stator 20.

[0087] According to the structure of the separation mechanism 70A including the force application unit 80, when the separation mechanism 70A separates the magnet 5 from the holding lower surface 54 toward the magnet mounting surface 29, even if the magnet 5 is subjected to a magnetic repulsive force from the magnet mounting surface 29 side, the magnet 5 can still be displaced to the magnet mounting surface 29. More specifically, when each magnet 5 is sequentially mounted on the magnet mounting surface 29 in such a way that the array of magnets 5 is a Heilbeck array, the magnet 5 held by the holding member 53 may sometimes be subjected to a repulsive force from the magnet 5 already mounted on the magnet mounting surface 29 (for further details, see...). Figure 15 (To be described later). In this respect, according to this structure, the force-applying unit 80 can displace the magnet 5 located at a predetermined position toward the magnet mounting surface 29, thereby suppressing the aforementioned repulsive force that hinders the installation operation. Therefore, the installation operation of the magnet 5 can be performed accurately and easily.

[0088] Alternatively, the force-applying unit 80 may include a jetting unit that sprays air onto the magnet 5 instead of the force-applying rod 82. In this case, the sprayed air also applies force to the magnet 5 located at a predetermined position toward the magnet mounting surface 29, thus achieving the aforementioned technical advantages.

[0089] Since the force-applying unit 80 has a structure in which a force-applying rod 82 is configured to displace in the vertical direction, the force-applying rod 82 applies a downward force to the magnet 5, and the magnet 5 can reliably displace toward the magnet mounting surface 29.

[0090] Alternatively, the force-applying rod 82 may not include the threaded shaft portion 83. For example, even if the force-applying rod 82 is the shaft portion of a cylinder or solenoid, the force-applying rod 82 can still apply downward force to the magnet 5, thus achieving the aforementioned technical advantages.

[0091] Based on the structure of the force-applying rod 82 having a threaded shaft portion 83 that engages with the inner circumferential surface 58 of the retaining hole 57, when the operator rotates the screw 37, the rotating force-applying rod 82 and the magnet 5 gradually move downward together. Because the speed of the magnet 5 as it approaches the magnet mounting surface 29 from the predetermined position can be reduced, the collision force generated between the magnet 5 and the magnet mounting surface 29 when the magnet 5 reaches the magnet mounting surface 29 by magnetic attraction can be reduced. Therefore, the magnet 5 can be more properly mounted on the magnet mounting surface 29.

[0092] Alternatively, the force-applying rod 82 can be rotated by an actuator such as an electric motor, replacing the operator. Even in this case, the aforementioned technical advantages can still be obtained.

[0093] <Retaining mechanism 55A of the first embodiment>

[0094] Reference Figure 6 The retaining mechanism 55A (55) of the first embodiment will be described in detail below. The retaining mechanism 55A further includes a pair of retaining protrusions 51 spaced apart along the retaining lower surface 54 in a direction orthogonal to the axial direction. Each retaining protrusion 51 protrudes downward from the retaining lower surface 54. Furthermore, each retaining protrusion 51 is separate from the retaining member 53 and is formed of a non-magnetic material. Each retaining protrusion 51 is fixed to the retaining lower surface 54, for example, by a fastening member. Moreover, each retaining protrusion 51 extends axially. The axial length of the retaining protrusion 51 may also be greater than the axial length of the magnet 5. An inner surface 51a is formed on each retaining protrusion 51. The pair of inner surface 51a faces each other in a direction perpendicular to the axial direction. Each retaining protrusion 51 is shorter than the magnet 5 in the vertical direction.

[0095] Furthermore, the retaining mechanism 55A includes a spacer 66 sandwiched between the upper surface 5a of the magnet 5 and the lower retaining surface 54. The spacer 66 is a plate extending axially between a pair of retaining protrusions 51 and has a thickness in the vertical direction. In this example, the spacer 66 abuts against each of the inner surfaces 51a. The spacer 66 is formed of a non-magnetic material with excellent lubricity and wear resistance.

[0096] Furthermore, the spacer 66 in this example has a flat lower surface 661 and a recess 662 formed on the lower surface 661. The recess 662 extends axially. The upper end of the magnet 5 is fitted into the recess 662, and the bottom surface 662a formed on the recess 662 directly abuts against the upper surface 5a of the magnet 5. In addition, although this is only one example, the vertical dimension (i.e., depth dimension) of the recess 662 is less than 1 / 2 of the vertical dimension of the magnet 5, and more specifically, less than 1 / 4.

[0097] The spacer 66 is installed on the retaining lower surface 54 as follows: The operator inserts the spacer 66 between a pair of retaining protrusions 51, bringing it into contact with the retaining lower surface 54. At this time, the retaining hole 57 is blocked from below by the spacer 66. The operator presses the spacer 66 against the retaining lower surface 54 and inserts the magnet 5 between the pair of retaining protrusions 51, embedding it into the recess 662. Through the attraction between the magnet 5 and the retaining member 53, the spacer 66 and the magnet 5 are installed together on the retaining lower surface 54. Then, when the aforementioned force-applying rod 82 protrudes downward from the retaining hole 57 and applies downward force to the spacer 66, the spacer 66 and the magnet 5 can be displaced downward along the pair of retaining protrusions 51 and move away from the retaining lower surface 54.

[0098] According to the structure of the retaining mechanism 55A, which includes a pair of retaining protrusions 51, when the magnet 5 is mounted on the retaining lower surface 54 and when the magnet 5 and the spacer 66 move away from the retaining lower surface 54, the pair of retaining protrusions 51 can guide the vertical displacement of the magnet 5. Therefore, the installation of the magnet 5 becomes easier. Alternatively, it is not necessary to form a recess 662 for embedding the magnet 5 on the lower surface 661 of the spacer 66. In this case, the above-mentioned technical advantages can also be obtained.

[0099] According to the structure of the holding mechanism 55A including the spacer 66, the force application unit 80 can apply force to the magnet 5 toward the magnet mounting surface 29 via the spacer 66. This prevents the force from concentrating on specific parts of the magnet 5, allowing the magnet 5 to leave the holding lower surface 54 in a position approximately parallel to the axial direction. Furthermore, since the spacer 66 abuts against a pair of inner surfaces 51a, tilting of the spacer 66 relative to the axial and circumferential directions is prevented. Therefore, the magnet 5 can be positioned further approximately parallel to the axial and circumferential directions. Additionally, the distance from the holding lower surface 54 to the magnet 5 in the vertical direction when the holding member 53 holds the magnet 5 is appropriated by adjusting the thickness of the spacer 66. This appropriates the magnetic attraction between the holding lower surface 54 and the magnet 5, allowing for smooth transfer of the magnet 5 from the holding lower surface 54 to the magnet mounting surface 29.

[0100] <Rotating Support Mechanism 90>

[0101] like Figure 3 , Figure 7 As shown, the stator magnet assembly device 50A (50) may also include a rotation support mechanism 90 configured to rotate the stator 20. By rotating the stator 20 in the circumferential direction, the relative position of the stator core 24 with respect to the holding member 53 is changed.

[0102] like Figure 3 As illustrated, the rotary support mechanism 90 includes: a pair of support walls 94, spaced apart axially; a plurality of support shafts 95, each supported by the pair of support walls 94; a rotating body 96, each supported by the plurality of support shafts 95; a stator support body 92, supporting the stator core 24; and a pin 98 extending axially.

[0103] A pair of support walls 94, extending in a direction orthogonal to the axial direction, are disposed between the aforementioned pair of pillars 64. Each support shaft 95 extends axially and supports the rotating body 96 via bearings. Therefore, each rotating body 96 can rotate about its respective support shaft 95. As an example, the rotating body 96 is a roller. Figure 7 In the example, multiple rotating bodies 96 are arranged in each support wall portion 94. However, this disclosure is not limited to this, and the number of rotating bodies 96 arranged between a pair of support wall portions 94 may also be one.

[0104] In this example, the stator support 92 is a pair of rings that axially hold the stator core 24. Each ring extends circumferentially. Each ring is supported by a plurality of rotating bodies 96, thereby allowing the stator support 92 to rotate circumferentially together with the stator core 24. The stator support 92 has a plurality of insertion holes 93 arranged circumferentially spaced apart. Each insertion hole 93 is open axially. A pin 98 is inserted into any one of the plurality of insertion holes 93 and a hole 94a formed in the support wall portion 94.

[0105] The assembly of the magnet 5 using the rotating support mechanism 90 is performed as follows. The operator removes pin 98, causing the stator support 92 and stator core 24 to rotate together in the circumferential direction. At this time, multiple rotating bodies 96 rotate in conjunction with the rotation of the stator support 92. The magnet reaches the axis S (refer to the desired location on the magnet mounting surface 29). Figure 4 When the stator is directly below the stator support 92, the operator stops rotating the stator support 92 and inserts the pin 98 into the holes 94a and 93. The stator core 24 is then fixed, allowing the operator to mount the magnet 5 onto the magnet mounting surface 29.

[0106] The stator magnet assembly device 50A has a structure including a rotating support mechanism 90, which changes the relative position of the stator core 24 with respect to the holding member 53 by rotating the stator core 24. This allows the desired magnet mounting surface 29 to be positioned directly below the magnet 5 held by the holding member 53. Therefore, the installation of the magnet 5 can be performed accurately.

[0107] The rotating support mechanism 90 is not limited to the embodiments described above. The stator support 92 may be a single ring instead of a pair of rings. Gear teeth extending continuously in the circumferential direction may also be formed on the outer circumferential surface of the single ring. In this case, the rotating body 96 is not a roller, but a gear (pinion) meshing with the gear teeth, and the lower part of the rotating body 96 meshes with a rack extending linearly in the horizontal direction. If the rack moves linearly by power applied from a drive source such as an electric motor, the stator support 92 can rotate together with the stator core 24. In this case, if the rotating support mechanism 90 has a stop to fix the rack in a predetermined position, the aforementioned insertion hole 93, hole 94a, and pin 98 are not required. Alternatively, the rack can be stopped using the holding torque (holding torque) of the electric motor. In this case, a stop is not required. In this embodiment, the relative position of the stator core 24 with respect to the holding member 53 is also changed by the rotation of the stator core 24, thus obtaining the aforementioned technical advantages.

[0108] <Stator magnet assembly method (first embodiment)>

[0109] Reference Figure 8 , Figures 9A-9D The assembly method of the magnet 5 (stator magnet) of the first embodiment will be described. In this assembly method, the stator magnet assembly device 50A of the first embodiment is used. Hereinafter, the moving mechanism 60A is shown as excluding the up-and-down moving mechanism 67 (see reference). Figure 3 The assembly method of the implementation of the above. Hereinafter, "step" will sometimes be abbreviated as "S".

[0110] First, a holding step (S11) is performed to attract and hold the magnet 5 to the holding lower surface 54. For example, as... Figure 9A , Figure 9B As shown, the operator moves the holding member 53 to the second guide 62 and mounts the magnet 5 onto the holding lower surface 54 via the spacer 66. Thus, the magnet 5 is held by the holding lower surface 54 at a position away from the axial direction of the stator core 24 and moving axially upwards.

[0111] Next, a rotation step (S13) is performed to rotate the stator core 24 to a predetermined rotation position and then stop it. S13 is performed using the rotation support mechanism 90. This rotation is achieved by rotating the stator core 24... Figure 9B Arrow A) indicates that the desired location in the magnet mounting surface 29 is directly below axis S.

[0112] Next, an adhesive bonding step (S15) is performed, in which adhesive is applied to at least one of the lower surface 5b of the magnet 5 or the magnet mounting surface 29 located directly below the axis S. The application of adhesive is performed by an operator, an industrial robot, or a combination thereof. Furthermore, the lower surface 5b is the surface of the magnet 5 opposite to the upper surface 5a.

[0113] Next, a moving step (S17) is performed to move the holding member 53, so that the magnet 5 held by the holding member 53 is positioned at a predetermined position. The holding member 53 moves along the second guide portion 62 and the first guide portion 61. By moving the holding member 53 along the axial direction, the magnet 5 reaches the predetermined position (see reference). Figure 9C At this time, the retaining member 53 is supported by the first guide 61 along its entire axial length and span of the retaining member 53.

[0114] Next, a separation step (S19) is performed to separate the magnet 5 held by the holding member 53 from the holding lower surface 54 toward the magnet mounting surface 29. S19 is performed by the force application unit 80 of the separation mechanism 70A described above. More specifically, the magnet 5 held by the holding member 53 is forceped toward the magnet mounting surface 29 to move away from the holding lower surface 54 (see reference). Figure 9D More specifically, the operator uses a force-applying rod 82 inserted into the retaining hole 57 to apply force to the magnet 5 and the spacer 66 toward the magnet mounting surface 29, so that the magnet 5 and the spacer 66 together leave the retaining lower surface 54.

[0115] The magnet 5, displaced downward from its predetermined position, is attracted by the attractive force from the stator core 24 to the magnet mounting surface 29. As a result, the magnet 5 is mounted on the magnet mounting surface 29 (see reference 29). Figure 9E Then remove spacer 66. This assembly method is now complete.

[0116] Alternatively, the moving mechanism 60A may also include the described vertical moving mechanism 67 (see reference). Figure 1 In this case, after moving the holding member 53 to the position supported by the first guide 61 in S17, the holding member 53 is moved downward to position the magnet 5 in the predetermined position. Furthermore, the order of S11, S13, and S15 can be any combination. Additionally, these three steps can be performed simultaneously.

[0117] According to the structure of performing the bonding step (S15), by performing the separation step (S19), it is possible to prevent the magnet 5 from floating off the magnet mounting surface 29 due to the influence of other magnets 5 after the magnet 5 is mounted on the magnet mounting surface 29.

[0118] <Modification of the separation mechanism 70A(70)>

[0119] Figure 10AThis is a schematic diagram showing the separation mechanism 70A of the first modified example. The separation mechanism 70A may also further include an electromagnet 72 disposed on the holding member 53. The electromagnet 72 is disposed, for example, on the upper surface of the horizontal plate 531. The electromagnet 72 has an energized coil (not shown) extending spirally in the vertical direction. The electromagnet 72 is turned on by current flowing through the energized coil, and is turned off when the energizing is stopped.

[0120] The use of electromagnet 72 is described below. When electromagnet 72 is in the energized state, the magnetic field generated in the energized coil attracts magnet 5 to the holding lower surface 54. If electromagnet 72 is de-energized after magnet 5 reaches a predetermined position, the magnetic force caused by electromagnet 72 disappears, and magnet 5 can easily be displaced downward from the holding lower surface 54.

[0121] If the winding method of the energized coil is changed, the magnetic field generated when the electromagnet 72 is in the energized state can also apply a downward magnetic force to the magnet 5. In this case, if the electromagnet 72 is switched from the de-energized state to the energized state after the magnet 5 reaches the predetermined position, the magnet 5 will move away from the holding lower surface 54 and towards the magnet mounting surface 29. Therefore, in the separation step (S19), the electromagnet 72 can be switched from the energized state to the de-energized state, or vice versa.

[0122] According to the above structure, by switching the state of the electromagnet 72, the separation mechanism 70A can separate the magnet 5 from the holding lower surface 54.

[0123] Furthermore, as described above, the magnet 5 in one embodiment of this disclosure includes a first radial magnet 1, a second radial magnet 2, a first circumferential magnet 3, and a second circumferential magnet 4. When a specific magnet 5 of these four types is mounted on the magnet mounting surface 29, an electromagnet 72 can also be used.

[0124] Figure 10B This is a schematic diagram showing the separation mechanism 70A of the second modification. The separation mechanism 70A may also further include a mounting magnet 74 that is detachably mounted to the holding member 53. The mounting magnet 74 is, for example, a permanent magnet disposed on the upper surface of the horizontal plate 531. By attracting the magnet 5 with the mounting magnet 74, the magnet 5 is more forcefully attracted to the lower holding surface 54. In this case, the mounting magnet 74 is removed in the separation step (S19).

[0125] According to the above structure, by removing the mounting magnet 74 from the holding member 53, the separation mechanism 70A can separate the magnet 5 from the holding lower surface 54. Furthermore, the present invention is not limited to removing the mounting magnet 74 upwards from the holding member 53. The mounting magnet 74 can also detach from the holding member 53 while sliding axially or circumferentially relative to the horizontal plate 531.

[0126] Furthermore, as described above, the magnet 5 in one embodiment of this disclosure includes a first radial magnet 1, a second radial magnet 2, a first circumferential magnet 3, and a second circumferential magnet 4. Multiple mounting magnets 74 may also be used separately based on these four types of magnets 5.

[0127] <Stator magnet assembly device 50B according to the second embodiment>

[0128] Reference Figure 8 , Figure 11 , Figures 12A-12C The stator magnet assembly apparatus 50B (50) of the second embodiment will be described below. In addition, for the components of the stator magnet assembly apparatus 50B that are the same as those in the first embodiment, the same reference numerals are used in the drawings, and their descriptions are sometimes omitted or simplified below.

[0129] like Figure 11 As illustrated, the stator magnet assembly device 50B (50) includes: a holding mechanism 55B (55), a moving mechanism 60B (60) and a separating mechanism 70B (70).

[0130] The retaining mechanism 55B includes a rod-shaped tool 45 extending along its length. The rod-shaped tool 45 has the aforementioned retaining member 53 formed on a first side along its length and a non-magnetic member 44 made of a non-magnetic material formed on a second side along its length. The retaining member 53 and the non-magnetic member 44 are interconnected and extend continuously and linearly along their length. The rod-shaped tool 45 may also be detachably mounted relative to the axial guide 65B (65) described later. The first side of the rod-shaped tool 45 along its length is the direction indicated by arrow Q1, and the second side along its length is the direction indicated by arrow Q2.

[0131] The axial guide 65B (65) of the moving mechanism 60B includes a third guide portion 63 disposed on the opposite side of the stator core 24 in the axial direction. The third guide portion 63 is integrally formed of the same material as the first guide portion 61. When the rod-shaped tool 45 is mounted on the axial guide 65B, the length direction of the rod-shaped tool 45 is parallel to the axial direction, and the second side in the length direction becomes the axial side. The mounted rod-shaped tool 45 can move along the axial guide 65B.

[0132] The separation mechanism 70B includes a protrusion 49 on the end face 24a of the stator core 24 fixed to the other side in the axial direction. The protrusion 49 protrudes further towards the axis S (i.e., the center side of the stator 20) than the magnet mounting surface 29 located directly below the axis S.

[0133] The method of using the stator magnet assembly device 50B is as follows: Figure 8 The flowchart is shown below. To avoid repetition, only the steps that differ from the first embodiment will be described below.

[0134] In the holding step (S11), the rod-shaped tool 45 is mounted on the axial guide 65B, and the magnet 5 is mounted on the holding member 53 (see reference). Figure 11 At this time, the retaining component 53 is supported by the second guide 62.

[0135] In the moving step (S17), the operator moves the rod-shaped tool 45 along the axial guide 65B to position the magnet 5 in a predetermined position. S17 ends when the magnet end face 5c of the magnet 5 on the other side of the axial direction abuts against the protrusion 49 (see reference). Figure 12A ).

[0136] In the separation step (S19), with the magnet end face 5c abutting against the protrusion 49, the operator moves the rod-shaped tool 45 further axially to the other side. The magnet 5 abutting against the protrusion 49 remains stationary. The rod-shaped tool 45 slides relative to the magnet 5 and moves axially to the other side. The end of the magnet 5 on the axial side abuts against the non-magnetic part 44 instead of the holding member 53 (see reference). Figure 12B As a result, this end of magnet 5 is displaced onto magnet mounting surface 29 by the magnetic attraction it receives from magnet mounting surface 29. After magnet 5 is in an axially inclined position, rod-shaped tool 45 continues to move. Soon, the end of magnet 5 on the other side of the axial direction receives a stronger attraction from magnet mounting surface 29 than from holding member 53, and moves from holding member 53 to magnet mounting surface 29. Thus, magnet 5 is mounted on magnet mounting surface 29 (see reference). Figure 12C ).

[0137] According to the above structure, the magnet 5 can be installed on the magnet mounting surface 29 simply by moving the rod-shaped tool 45 to the other side in the axial direction, thus enabling the magnet 5 to be efficiently assembled into the stator core 24.

[0138] <Stator Manufacturing Method>

[0139] Reference Figures 13-15 The manufacturing method of stator 20 will now be explained. In the manufacturing method of stator 20, the process involves repeated steps... Figure 8The stator magnet assembly method illustrated in the figure (S11~S19) involves assembling multiple magnets 5 onto the stator core 24 along its entire circumferential length. As a result, multiple magnets 5 are arranged in a Heilbeck array within the stator core 24.

[0140] The method for manufacturing the stator 20 includes: a radial magnet arrangement step (S21), in which a first radial magnet 1 and a second radial magnet 2 are alternately arranged at intervals in the circumferential direction of the stator core 24; and a circumferential magnet arrangement step (S23), in which a first circumferential magnet 3 and a second circumferential magnet 4 are arranged at intervals in the circumferential direction after S21.

[0141] In S21, via Figure 8 As shown in S11~S19, either the first radial magnet 1 or the second radial magnet 2 is configured. By repeatedly executing S11~S19, multiple first radial magnets 1 and multiple second radial magnets 2 are sequentially assembled onto the stator core 24 (see reference). Figure 14 ).

[0142] S23 is the same as S21. That is, through Figure 8 As shown in S11~S19, one of the first circumferential magnet 3 and the second circumferential magnet 4 is configured. By repeatedly executing S11~S19, multiple first circumferential magnets 3 and multiple second circumferential magnets 4 are sequentially assembled onto the stator core 24 (refer to...). Figure 15 The operator positions the first circumferential magnet 3 on one side of the first radial magnet 1 in the circumferential direction and on the other side of the second radial magnet 2 in the circumferential direction, and positions the second circumferential magnet 4 on the other side of the first radial magnet 1 in the circumferential direction and on one side of the second radial magnet 2 in the circumferential direction.

[0143] During the assembly of the first circumferential magnet 3 and the second circumferential magnet 4, the first radial magnet 1 and the second radial magnet 2 have already been assembled onto the stator core 24. Therefore, due to the magnetic fields generated by the first radial magnet 1 and the second radial magnet 2 respectively, the first radial magnet 1 and the second circumferential magnet 4 are respectively subjected to magnetic repulsion while being installed onto the stator core 24. Therefore, in Figure 8 In the separation step (S19) shown, it is preferable to use the force application unit 80 (refer to...) Figure 9D A force is applied to the first circumferential magnet 3 and the second circumferential magnet 4 toward the magnet mounting surface 29. As a result, the first circumferential magnet 3 and the second circumferential magnet 4 can reach the magnet mounting surface 29 while resisting the repulsive force.

[0144] Furthermore, even after the first circumferential magnet 3 and the second circumferential magnet 4 are installed on the magnet mounting surface 29, they may still be lifted off the magnet mounting surface 29 due to the influence of the magnetic field caused by the first radial magnet 1 and the second radial magnet 2, which exerts a force inward in the radial direction. To address this, by performing the bonding step (S15), the first circumferential magnet 3 and the second circumferential magnet 4 are bonded to the magnet mounting surface 29, thus suppressing the lifting of the first circumferential magnet 3 and the second circumferential magnet 4.

[0145] Summary

[0146] The contents described in the above-described embodiments are as follows.

[0147] 1) The stator magnet assembly apparatus (50) of at least one embodiment of the present disclosure is a stator magnet assembly apparatus for assembling a magnet (5) onto a stator core (24), the stator magnet assembly apparatus comprising: The retaining mechanism (55) includes a retaining member (53) formed of a magnetic material, the retaining member having a retaining lower surface (54) for attracting and retaining the upper surface (5a) of the magnet by magnetic force. The moving mechanism (60) is used to move the holding member so that the magnet held by the holding member is positioned at a predetermined position facing the magnet mounting surface (29) of the stator core in the vertical direction with a gap; and Separation mechanism (70) is used to separate the magnet held at the predetermined position from the holding lower surface toward the magnet mounting surface.

[0148] According to the structure described in 1) above, after the moving mechanism moves the holding member to position the magnet in a predetermined position, the separating mechanism separates the magnet from the lower surface of the holding member toward the magnet mounting surface, thereby attracting the magnet to the stator core and mounting it on the magnet mounting surface. Since the magnet can be mounted on the magnet mounting surface without stopping, a stator magnet assembly device that can efficiently assemble the magnet onto the stator core can be realized.

[0149] 2) In several embodiments, based on the stator magnet assembly device described in 1) above, The aforementioned moving mechanism also includes an axial guide (65) that extends along the axial direction of the aforementioned stator core and supports the aforementioned retaining member as movable.

[0150] According to the structure described in 2) above, the magnet can be mounted on the retaining member at a position away from a predetermined position along the axial direction. The retaining member can then be moved stably along the axial direction to position the magnet in the predetermined position. Therefore, the installation operation of the magnet onto the magnet mounting surface can be easily performed.

[0151] 3) In several embodiments, based on the stator magnet assembly device described in 2) above, The aforementioned axial guide includes: The first guide portion (61) is disposed within the axial range of the stator core; and The second guide section (62) is positioned at a location that moves away from the aforementioned axial range of the stator core to one side. The axial length of the second guide portion is greater than or equal to the axial length of the first guide portion.

[0152] According to the structure described in 3) above, the magnet can be mounted on the lower surface of the holder while the retaining member is supported by the second guide. Since the magnet is mounted at a position away from the axial direction of the stator core, the magnetic attraction between the magnet and the stator core will not hinder the installation of the magnet. Therefore, the magnet mounting operation can be performed easily.

[0153] 4) In several embodiments, based on the stator magnet assembly device described in 2) or 3) above, The aforementioned moving mechanism includes a vertical moving mechanism (60) for moving the aforementioned holding member along the aforementioned vertical direction.

[0154] Based on the structure described in 4) above, the magnet can be mounted on the retaining lower surface at a position that is offset upwards from the magnet mounting surface. Since the magnetic attraction between the magnet and the stator core does not hinder the installation of the magnet, the magnet installation operation can be performed easily.

[0155] 5) In several embodiments, based on the stator magnet assembly device described in any one of 1) to 4) above, The aforementioned retaining mechanism further includes a pair of retaining protrusions (51), which are formed of a non-magnetic material and protrude downward from the aforementioned retaining lower surface. The pair of retaining protrusions are spaced apart along the aforementioned retaining lower surface in a direction orthogonal to the axial direction of the aforementioned stator core.

[0156] According to the structure described in 5) above, when the magnet is mounted on the lower surface of the holder and when the magnet is removed from the lower surface of the holder, a pair of retaining protrusions can guide the vertical displacement of the magnet. Therefore, the installation of the magnet becomes easier.

[0157] 6) In several embodiments, based on the stator magnet assembly apparatus described in any one of 1) to 5) above, The separation mechanism includes a force-applying unit (80) for applying force to the magnet held by the holding member, so as to separate the magnet from the holding lower surface toward the magnet mounting surface.

[0158] According to the structure described in 6) above, when the separation mechanism separates the magnet from the holding lower surface toward the magnet mounting surface, even if the magnet is subjected to magnetic repulsion from the magnet mounting surface side, the magnet can still be displaced toward the magnet mounting surface by the force application unit. Therefore, the magnet installation operation can be performed accurately and easily.

[0159] 7) In several embodiments, based on the stator magnet assembly device described in 6) above, The aforementioned retaining member has a retaining hole (57) that opens on the lower surface of the retaining member. The aforementioned force-applying unit has a force-applying rod (82) inserted into the aforementioned retaining hole. The aforementioned force-applying rod is configured to be able to move vertically.

[0160] According to the structure in 7) above, the force bar applies a downward force to the magnet, thereby enabling the magnet to reliably displace towards the magnet mounting surface.

[0161] 8) In several embodiments, based on the stator magnet assembly device described in 7) above, The aforementioned retaining hole is a threaded hole having an inner circumferential surface (58) with internal threads. The aforementioned force-applying rod has a threaded shaft portion (83) that engages with the aforementioned inner circumferential surface.

[0162] Based on the structure described in 8) above, by rotating the force-applying rod, the force-applying rod and the magnet gradually move downwards together. Because the speed of the magnet approaching the magnet mounting surface can be reduced, the collision force generated between the two when the magnet reaches the magnet mounting surface can be reduced. Therefore, the magnet can be mounted more appropriately on the magnet mounting surface.

[0163] 9) In several embodiments, based on the stator magnet assembly apparatus described in any one of 6) to 8) above, The aforementioned holding mechanism further includes a spacer (66) sandwiched between the magnet and the holding lower surface, the spacer extending along the axial direction of the stator core and being formed of a non-magnetic material.

[0164] According to the structure described in 9) above, the force-applying unit can apply force to the magnet toward the magnet mounting surface via the spacer. This prevents the force from concentrating on specific parts of the magnet, allowing the magnet to leave the holding lower surface in a generally parallel posture relative to the axial direction. Furthermore, the distance from the holding lower surface to the magnet when the holding member holds the magnet is appropriately adjusted by regulating the thickness of the spacer. This appropriately regulates the magnetic attraction between the holding lower surface and the magnet, enabling smooth transfer of the magnet from the holding lower surface to the magnet mounting surface. Moreover, in the embodiment where the spacer abuts against the inner surfaces of each of the pair of holding protrusions, the spacer's tilt relative to the axial and circumferential directions can be suppressed, allowing the magnet to be positioned even more generally parallel relative to the axial and circumferential directions.

[0165] 10) In several embodiments, based on the stator magnet assembly apparatus described in any one of 1) to 9) above, The separation mechanism also includes an electromagnet disposed on the holding member.

[0166] According to the structure of 10) above, by switching the state of the electromagnet, the separation mechanism can make the magnet leave the holding lower surface.

[0167] 11) In several embodiments, based on any one of the stator magnet assembly devices described in 1) to 10) above, The aforementioned separation mechanism also includes a mounting magnet (74) that is detachably mounted to the aforementioned retaining member.

[0168] According to the structure of 11) above, by removing the mounting magnet from the holding member, the separation mechanism can make the magnet leave the lower surface of the holding member.

[0169] 12) In several embodiments, based on any one of the stator magnet assembly devices described in 2) to 4) above, The aforementioned retaining mechanism also includes a rod-shaped tool (45) with a length direction. The above-mentioned rod-shaped tool has: The aforementioned retaining member is formed on the first side in the aforementioned length direction; and A non-magnetic component is formed on the second side in the aforementioned length direction and is made of a non-magnetic material (44). The aforementioned axial guide is configured to support the rod-shaped tool so that its length direction is parallel to the aforementioned axial direction and the aforementioned second side is one side of the aforementioned axial direction, enabling it to move. The separation mechanism includes a protrusion (49) that protrudes toward the center of the stator core and is configured to abut against the end face (5c) of the magnet on the other side of the magnet at the predetermined position.

[0170] According to the structure described in 12) above, a rod-shaped tool can be positioned on the axial guide, and a magnet can be mounted on the retaining member. When the rod-shaped tool is moved to the other side axially, the end face of the magnet abuts against the protrusion. The rod-shaped tool continues to move to the other side without changing direction, and the magnet abutting against the protrusion remains stationary. The end of the magnet on the axial side abuts against the non-magnetic member instead of the retaining member, and as a result, it is displaced to the magnet mounting surface by the magnetic attraction force received from the magnet mounting surface. Then, the rod-shaped tool continues to move. Finally, the end of the magnet on the other side axially receives a stronger attraction force from the magnet mounting surface than from the retaining member, and moves from the retaining member to the magnet mounting surface. Thus, the magnet is mounted on the magnet mounting surface. In this way, the magnet can be mounted on the magnet mounting surface simply by moving the rod-shaped tool to the other side axially, thus enabling efficient assembly of the magnet into the stator core.

[0171] 13) In several embodiments, based on any one of the stator magnet assembly devices described in 1) to 12) above, The stator magnet assembly device also includes a rotating support mechanism (90), which is configured to change the relative position of the stator core with respect to the holding member by rotating the stator core.

[0172] According to the structure described in 13), the relative position of the stator core to the holding member is changed by rotating the stator core. This allows a desired magnet mounting surface to be positioned directly below the magnet held by the holding member. Therefore, the magnet mounting operation can be performed accurately.

[0173] 14) The stator magnet assembly method of at least one embodiment of the present disclosure is a stator magnet assembly method for assembling a magnet (5) onto a stator core (24), wherein the stator magnet assembly method comprises the following steps: In the holding step (S11), the magnet is attracted and held on the holding lower surface (54) of the holding member (53) formed of magnetic material. In the moving step (S17), the holding member is moved so that the held magnet is positioned at a predetermined position facing the magnet mounting surface (29) of the stator core, which is spaced apart vertically from it; and In the separation step (S19), the magnet held by the holding member is separated from the holding lower surface toward the magnet mounting surface.

[0174] Based on the structure described in 14), the same technical advantages as described in 1) can be obtained.

[0175] 15) In several embodiments, based on the stator magnet assembly method described in 14) above, Prior to the separation step described above, there is also an adhesion step (S15) in which an adhesive is applied to at least one of the lower surface (5b) of the magnet and the mounting surface of the magnet.

[0176] According to the structure of 15) above, after the magnet is installed on the magnet mounting surface by performing the separation step, it is possible to suppress the magnet from floating off the magnet mounting surface due to the magnetic force of other magnets.

[0177] 16) In several embodiments, based on the stator magnet assembly method described in 14) or 15) above, In the above-described holding step, the magnet is held on the lower holding surface at a position that is separated to one side from the axial direction of the stator core. In the above-described moving step, the holding member that holds the magnet is moved along the axial direction of the stator core.

[0178] Based on the structure described in 16), the same technical advantages as described in 3) can be obtained.

[0179] 17) In several embodiments, based on the stator magnet assembly method described in 16) above, In the above-described moving step, after the holding member is moved along the above-described axial direction, the holding member is moved downward in such a way that the magnet is positioned at the above-described predetermined position.

[0180] Based on the structure described in 17), the same technical advantages as described in 4) can be obtained.

[0181] 18) In several embodiments, based on any one of the stator magnet assembly methods described in 14) to 17) above, In the separation step described above, a force is applied to the magnet held by the holding member toward the magnet mounting surface to separate the magnet from the holding lower surface.

[0182] Based on the structure described in 18), the same technical advantages as described in 6) can be obtained.

[0183] 19) In several embodiments, based on the stator magnet assembly method described in 18) above, The aforementioned retaining member has a retaining hole (57) that opens on the lower surface of the retaining member. In the separation step described above, a force-applying rod (82) inserted into the retaining hole and capable of displacement along the vertical direction is used to apply force to the magnet toward the magnet mounting surface so that the magnet is separated from the retaining lower surface.

[0184] Based on the structure described in 19), the same technical advantages as described in 7) can be obtained.

[0185] 20) In several embodiments, based on any one of the stator magnet assembly methods described in 14) to 19) above, In the separation step, the electromagnet (72) disposed on the holding member is turned on or off.

[0186] Based on the structure of 20) above, the same technical advantages as those of 10) above can be obtained.

[0187] 21) In several embodiments, based on any one of the stator magnet assembly methods described in 14) to 20) above, In the separation step described above, the mounting magnet (74) installed on the retaining component is removed.

[0188] Based on the structure of 21) above, the same technical advantages as those of 11) above can be obtained.

[0189] 22) In several embodiments, based on the stator magnet assembly method described in 14) above, In the above-described holding step, the holding member of the rod-shaped tool (45) holds the magnet. The rod-shaped tool has a length direction, on which the holding member is formed on a first side and on which a non-magnetic member made of a non-magnetic material is formed on a second side. In the above-described moving step, the axial guide (65) of the rod-shaped tool is supported in such a way that its length direction is parallel to the axial direction of the stator core and its second side becomes one side of the axial direction of the stator core, and the rod-shaped tool is moved along the axial guide so that the magnet is positioned at the predetermined position. In the separation step described above, the protrusion (49) protruding toward the center side of the stator core is brought into contact with the magnet end face (5c) on the other side of the axial direction of the magnet that moves along with the moving step described above, and the rod-shaped tool is moved further toward the other side along the axial guide.

[0190] Based on the structure described in 22), the same technical advantages as described in 12) can be obtained.

[0191] 23) In several embodiments, based on any one of the stator magnet assembly methods described in 14) to 22) above, The above-mentioned stator magnet assembly method further includes a rotation step (S13) in which the stator core is rotated to a predetermined rotation position and then stopped before the above-mentioned moving step is performed.

[0192] Based on the structure described in 23), the same technical advantages as described in 13) can be obtained.

[0193] 24) The stator manufacturing method of at least one embodiment of this disclosure assembles a plurality of the above-described magnets onto the stator core by repeatedly performing the stator magnet assembly method described in 14) above, thereby assembling the magnets across the entire circumferential length of the stator core. The aforementioned magnets include: The first radial magnet (1) is magnetized radially outward of the stator core. The second radial magnet (2) is magnetized toward the inner side of the aforementioned radial direction; The first circumferential magnet (3) is magnetized on one side of the stator core in the circumferential direction; and The second circumferential magnet (4) is magnetized on the other side of the aforementioned circumferential direction. The above-mentioned stator manufacturing method includes the following steps: In the radial magnet arrangement step (S21), the first radial magnet and the second radial magnet are alternately arranged at intervals in the circumferential direction of the stator core; and In the circumferential magnet arrangement step (S23), after the radial magnet arrangement step, the first circumferential magnet and the second circumferential magnet are arranged at intervals in the circumferential direction. The first circumferential magnet is arranged on one side of the first radial magnet in the circumferential direction and on the other side of the second radial magnet in the circumferential direction. The second circumferential magnet is arranged on the other side of the first radial magnet and on one side of the second radial magnet in the circumferential direction.

[0194] Based on the structure described in 24), the same technical advantages as described in 1) can be obtained.

[0195] 25) In several embodiments, based on the stator manufacturing method described in 24) above, In the separation step described above, a force is applied to the first circumferential magnet or the second circumferential magnet held by the holding member toward the magnet mounting surface, so that the first circumferential magnet or the second circumferential magnet separates from the holding lower surface.

[0196] According to the structure of 25) above, when performing the circumferential magnet configuration step, even if the first circumferential magnet or the second circumferential magnet is subjected to magnetic repulsion force from the first radial magnet and the second radial magnet, they can still be circumferentially mounted on the magnet mounting surface.

[0197] Explanation of reference numerals in the attached figures

[0198] 1: First radial magnet

[0199] 2: Second radial magnet

[0200] 3: First circumferential magnet

[0201] 4: Second circumferential magnet

[0202] 5: Magnet

[0203] 5a: Upper surface

[0204] 5b: Lower surface

[0205] 5c: Magnet end face

[0206] 6~8: Protrusion

[0207] 9: External devices

[0208] 10: Magnetic Gear Electric Machinery

[0209] 16: Power System

[0210] 17: Shell

[0211] 18: Rotation axis

[0212] 20: Stator

[0213] 23: Base

[0214] 24: Stator core

[0215] 24a: End face

[0216] 25: Teeth

[0217] 27: Stator coil

[0218] 29: Magnet mounting surface

[0219] 30: Magnetic pole rotor

[0220] 31: Connecting components

[0221] 35: Ring-shaped body

[0222] 36: Magnetic pole piece

[0223] 37: Screw

[0224] 40: Magnet rotor

[0225] 41: Inner magnet

[0226] 42: Rotor core

[0227] 44: Non-magnetic components

[0228] 45: Rod-shaped tool

[0229] 49: Protrusion

[0230] 50: Stator magnet assembly device

[0231] 51: Maintain the protrusion

[0232] 51a: Inner surface

[0233] 53: Retaining component

[0234] 54: Maintain the lower surface

[0235] 55: Maintain the organization

[0236] 57: Retaining Hole

[0237] 58: Inner circumferential surface

[0238] 60: Mobile mechanism

[0239] 61: First Guiding Section

[0240] 62: Second Guiding Section

[0241] 63: Third Guiding Department

[0242] 64: Pillar

[0243] 65: Axial guide

[0244] 66: Spacer

[0245] 67: Up and down moving mechanism

[0246] 69: Slider

[0247] 70: Separation mechanism

[0248] 72: Electromagnets

[0249] 74: Install the magnet

[0250] 80: Force-applying unit

[0251] 82: Force-applying lever

[0252] 83: Threaded shaft portion

[0253] 90: Rotary support mechanism

[0254] 92: Stator support

[0255] 93: Insertion Hole

[0256] 94: Supporting wall section

[0257] 94a: Hole

[0258] 95: Support shaft

[0259] 96: Solid of Revolution

[0260] 98: Sales

[0261] 161: Abutment

[0262] 162: Vertical track

[0263] 163: Movable support

[0264] 209: Clamping components

[0265] 252: Front end

[0266] 531: Horizontal plate

[0267] 532: Plumb line

[0268] 661: Lower surface

[0269] 662: concave part

[0270] 662a: Bottom surface

[0271] A, Q1, Q2: Arrows

[0272] L1, L2: Dimensions

[0273] S: Axis.

Claims

1. A stator magnet assembly device for assembling magnets onto a stator core, the stator magnet assembly device comprising: A retaining mechanism includes a retaining member formed of a magnetic material, the retaining member having a retaining lower surface for attracting and retaining the upper surface of the magnet by magnetic force; A moving mechanism for moving the holding member so that the magnet held by the holding member is positioned at a predetermined position facing the magnet mounting surface of the stator core with a gap in the vertical direction; and A separation mechanism for separating the magnet held at the predetermined position from the holding lower surface toward the magnet mounting surface.

2. The stator magnet assembly device according to claim 1, wherein, The moving mechanism also includes an axial guide that extends along the axial direction of the stator core and supports the retaining member as a movable component.

3. The stator magnet assembly device according to claim 2, wherein, The axial guide includes: The first guide portion is disposed within the axial range of the stator core; and The second guide portion is positioned at a location that extends to one side from the axial range of the stator core. The axial length of the second guide portion is greater than or equal to the axial length of the first guide portion.

4. The stator magnet assembly apparatus according to claim 2 or 3, wherein, The moving mechanism includes a vertical moving mechanism for moving the holding member along the vertical direction.

5. The stator magnet assembly apparatus according to any one of claims 1 to 3, wherein, The retaining mechanism further includes a pair of retaining protrusions formed of a non-magnetic material and protruding downward from the lower retaining surface. The pair of retaining protrusions are spaced apart along the lower retaining surface in a direction orthogonal to the axial direction of the stator core.

6. The stator magnet assembly apparatus according to any one of claims 1 to 3, wherein, The separation mechanism includes a force-applying unit for applying force to the magnet held by the holding member to separate the magnet from the holding lower surface toward the magnet mounting surface.

7. The stator magnet assembly apparatus according to claim 6, wherein, The retaining member has a retaining hole that opens on the lower surface of the retaining member. The force-applying unit has a force-applying rod inserted into the retaining hole. The force-applying rod is configured to be able to move up and down.

8. The stator magnet assembly apparatus according to claim 7, wherein, The retaining hole is a threaded hole with an inner circumferential surface having an internal thread. The force-applying rod has a threaded shaft portion that is threaded into the inner circumferential surface.

9. The stator magnet assembly apparatus according to claim 6, wherein, The retaining mechanism further includes a spacer sandwiched between the magnet and the retaining lower surface, the spacer extending along the axial direction of the stator core and being formed of a non-magnetic material.

10. The stator magnet assembly apparatus according to any one of claims 1 to 3, wherein, The separation mechanism also includes an electromagnet disposed on the holding member.

11. The stator magnet assembly apparatus according to any one of claims 1 to 3, wherein, The separation mechanism further includes a mounting magnet that is detachably mounted to the retaining member.

12. The stator magnet assembly apparatus according to claim 2 or 3, wherein, The retaining mechanism also includes a rod-shaped tool with a length direction. The rod-shaped tool has: The retaining member is formed on a first side in the length direction; and A non-magnetic component, formed on the second side along the length direction and made of a non-magnetic material. The axial guide is configured to support the rod-shaped tool so that its length direction is parallel to the axial direction and the second side is one side of the axial direction, enabling it to move. The separation mechanism includes a protrusion that protrudes toward the center of the stator core and is configured to abut against the end face of the magnet on the other side of the magnet located at the predetermined position.

13. The stator magnet assembly apparatus according to any one of claims 1 to 3, wherein, The stator magnet assembly device also includes a rotating support mechanism, which is configured to change the relative position of the stator core with respect to the holding member by rotating the stator core.

14. A method for assembling a stator magnet, comprising assembling a magnet onto a stator core, the method comprising the following steps: The holding step involves attracting and holding the magnet to the lower holding surface of a holding member formed of magnetic material; The moving step involves moving the holding member to position the held magnet at a predetermined location facing the magnet mounting surface of the stator core, spaced apart vertically from it; and The separation step involves separating the magnet held by the holding member from the lower holding surface toward the magnet mounting surface.

15. The stator magnet assembly method according to claim 14, wherein, Prior to the separation step, there is also an adhesion step in which an adhesive is applied to at least one of the lower surface of the magnet and the mounting surface of the magnet.

16. The stator magnet assembly method according to claim 14 or 15, wherein, During the holding step, the magnet is held on the lower holding surface at a position that is axially separated from the stator core to one side. In the moving step, the holding member holding the magnet is moved along the axial direction of the stator core.

17. The stator magnet assembly method according to claim 16, wherein, In the moving step, after the holding member is moved along the axial direction, the holding member is moved downward in such a way that the magnet is positioned at the predetermined position.

18. The stator magnet assembly method according to claim 14 or 15, wherein, In the separation step, a force is applied to the magnet held by the holding member toward the magnet mounting surface to separate the magnet from the holding lower surface.

19. The stator magnet assembly method according to claim 18, wherein, The retaining member has a retaining hole that opens on the lower surface of the retaining member. In the separation step, a force-applying rod that is inserted through the retaining hole and is capable of displacement along the vertical direction is used to apply force to the magnet toward the magnet mounting surface, so as to separate the magnet from the retaining lower surface.

20. The stator magnet assembly method according to claim 14 or 15, wherein, In the separation step, the electromagnet disposed on the holding member is turned on or off.

21. The stator magnet assembly method according to claim 14 or 15, wherein, In the separation step, the mounting magnet installed on the retaining component is removed.

22. The stator magnet assembly method according to claim 14, wherein, In the holding step, the magnet is held by the holding member of the rod-shaped tool, which has a length direction, with the holding member formed on a first side of the length direction and a non-magnetic member made of a non-magnetic material formed on a second side of the length direction. In the moving step, an axial guide for the rod-shaped tool is used to support the rod-shaped tool in such a way that its length direction is parallel to the axial direction of the stator core and the second side becomes one side of the axial direction of the stator core, and the rod-shaped tool is moved along the axial guide to position the magnet at the predetermined position. In the separation step, the protrusion protruding toward the center side of the stator core abuts against the magnet end face on the other side of the axial direction of the magnet, which moves along with the moving step, and the rod-shaped tool is moved further toward the other side along the axial guide.

23. The stator magnet assembly method according to claim 14 or 15, wherein, The stator magnet assembly method further includes a rotation step of rotating the stator core to a predetermined rotation position and stopping it before performing the moving step.

24. A method for manufacturing a stator, comprising assembling a plurality of said magnets along the entire circumferential length of the stator core by repeatedly performing the stator magnet assembly method of claim 14. The plurality of magnets includes: The first radial magnet is magnetized radially outward from the stator core; The second radial magnet is magnetized toward the inner side in the radial direction; The first circumferential magnet is magnetized to one side of the stator core in the circumferential direction; and The second circumferential magnet is magnetized to the other side of the circumferential direction. The method for manufacturing the stator comprises the following steps: The radial magnet configuration step involves alternately arranging the first radial magnet and the second radial magnet in the circumferential direction of the stator core at intervals; and The circumferential magnet configuration step involves, after the radial magnet configuration step, arranging the first circumferential magnet and the second circumferential magnet at intervals in the circumferential direction, with the first circumferential magnet positioned on one side of the first radial magnet in the circumferential direction and on the other side of the second radial magnet in the circumferential direction, and the second circumferential magnet positioned on the other side of the first radial magnet and on one side of the second radial magnet in the circumferential direction.

25. The method for manufacturing a stator according to claim 24, wherein, In the separation step, a force is applied to the first circumferential magnet or the second circumferential magnet held by the holding member toward the magnet mounting surface, so that the first circumferential magnet or the second circumferential magnet separates from the holding lower surface.

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