Rotor, motor provided with same, and method for manufacturing rotor

Abstract

The rotor is provided with: a columnar rotor core having a plurality of core plates and magnet insertion holes; and a magnet inserted into the magnet insertion hole. The plurality of core plates have: a first core plate; and a second core plate which is stacked adjacent to the first core plate in the magnet insertion direction, and which has an insertion part constituting a part of the magnet insertion hole. The first core plate is provided with a protruding part which forms a part of the inner surface of the magnet insertion hole, and when the rotor is observed from the axial direction, the protruding part protrudes towards the inner side of the insertion part and makes contact with the magnet. The rotor has: a housing part which is located in the first core plate or the second core plate in a direction opposite to the protruding direction of the protruding part when the rotor is viewed from the axial direction; and a restricting member which is housed in the housing portion at a position in the opposite direction with respect to the protruding portion and restricts displacement of the protruding portion in the opposite direction.

Description

Technical Field

[0001] The present invention relates to a rotor, a motor including the rotor, and a method for manufacturing the rotor. Background Art

[0002] In a motor rotor for inserting a magnet into a magnet insertion hole, the following structure is known: a portion of the inner surface of the magnet insertion hole presses the magnet inwardly of the magnet insertion hole, thereby holding the magnet in the magnet insertion hole. For example, Japanese Publication No. 2013-126330 discloses an iron core of a rotating electric machine, wherein a plurality of core plates having insertion holes are stacked, a permanent magnet is inserted into the insertion hole, a bridge portion between the outer periphery of the core plate and the inner edge of the insertion hole is deformed toward the permanent magnet side, and the bridge portion presses the permanent magnet.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2013-126330 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the structure in which the magnet is held in the magnet insertion hole by pressing the magnet with a protrusion protruding from the inner surface of the magnet insertion hole as described above, when the magnet inserted in the magnet insertion hole is magnetized, a force pressing the protrusion is sometimes generated on the magnet due to magnetic flux. In the case where the protrusion is movable in the magnet insertion hole, when the magnet is magnetized as described above, the magnet presses the protrusion, whereby the protrusion or the portion supporting the protrusion may be plastically deformed. In this way, there is a possibility that the force holding the magnet in the magnet insertion hole by the protrusion is reduced.

[0008] Therefore, in a rotor in which the magnets are held in the magnet insertion holes by the protrusions, a structure capable of suppressing a decrease in the holding force of the magnets is required.

[0009] An object of the present invention is to realize a structure capable of suppressing a decrease in the holding force of a magnet in a rotor that holds a magnet inserted into a magnet insertion hole by a protrusion.

[0010] Solutions to Solve Problems

[0011] A rotor according to one embodiment of the present invention comprises: a columnar rotor core having a plurality of core plates stacked in the thickness direction and a magnet insertion hole extending in the axial direction; and a magnet inserted into the magnet insertion hole. The plurality of core plates comprises: a first core plate; and a second core plate stacked adjacent to the first core plate in the magnet insertion direction of the magnet and having an insertion portion constituting a portion of the magnet insertion hole. The first core plate comprises a protrusion constituting a portion of the inner surface of the magnet insertion hole and protruding inwardly of the insertion portion and contacting the magnet when the rotor is viewed from the axial direction. The rotor comprises: a housing portion located in the opposite direction of the protruding direction of the protruding portion in the first core plate or the second core plate when the rotor is viewed from the axial direction; and a limiting member housed in the housing portion at a position in the opposite direction relative to the protruding portion and limiting displacement of the protruding portion in the opposite direction.

[0012] A motor according to an embodiment of the present invention includes: a rotor having the above-described structure; and a stator including a stator coil and a stator core.

[0013] A manufacturing method of a rotor according to one embodiment of the present invention is a method for manufacturing the following rotor, which comprises: a cylindrical rotor core having a plurality of core plates stacked in the thickness direction and a magnet insertion hole extending in the axial direction; and a magnet inserted into the magnet insertion hole. The manufacturing method of the rotor comprises: a core plate forming step, forming a first core plate and a second core plate, the second core plate being stacked adjacent to the first core plate in the magnet insertion direction of the magnet, and having an insertion portion constituting a portion of the magnet insertion hole, and forming a protrusion on the first core plate, and forming a displacement allowance on the first core plate or the second core plate, the protrusion constituting a portion of the inner surface of the magnet insertion hole, and when the rotor is viewed from the axial direction, the protrusion protrudes inwardly of the insertion portion and contacts the magnet, and when the rotor is viewed from the axial direction, the displacement allowance is located on the opposite side of the protrusion to the protrusion direction of the protrusion. direction, and allowing the above-mentioned protrusion to be displaced in the above-mentioned opposite direction; a core plate stacking step, stacking the above-mentioned multiple core plates including the above-mentioned first core plate and the above-mentioned second core plate in the thickness direction, thereby obtaining the above-mentioned columnar rotor core having the above-mentioned magnet insertion hole extending in the axial direction; a magnet insertion step, inserting the above-mentioned magnet into the above-mentioned magnet insertion hole of the above-mentioned rotor core; a limiting component accommodation step, after the above-mentioned magnet insertion step, accommodating the limiting component that limits the displacement of the above-mentioned protrusion to the above-mentioned opposite direction in the above-mentioned displacement allowing portion on the above-mentioned first core plate or the above-mentioned second core plate; and a magnetization step, after the above-mentioned limiting component accommodation step, magnetizing the above-mentioned magnet inserted in the above-mentioned magnet insertion hole.

[0014] Effects of the Invention

[0015] According to one embodiment of the present invention, in a rotor that holds magnets inserted into magnet insertion holes by protrusions, a structure capable of suppressing a decrease in the holding force of the magnets is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram showing an example of a motor according to the first embodiment.

[0017] Figure 2 This is a diagram showing an example of a rotor according to the first embodiment.

[0018] Figure 3 This is a diagram showing an example of a rotor according to the first embodiment.

[0019] Figure 4 yes Figure 3 Sectional view along line IV-IV.

[0020] Figure 5 This is a diagram showing an example of a first core plate according to the first embodiment.

[0021] Figure 6 This is a diagram showing an example of a second core plate according to the first embodiment.

[0022] Figure 7 This is a diagram showing an example of a method for manufacturing a rotor according to the first embodiment.

[0023] Figure 8 This is a diagram showing an example of inserting magnets into the rotor core according to the first embodiment.

[0024] Fig. 9 This is a diagram showing an example of inserting magnets into the rotor core according to the first embodiment.

[0025] Fig.10 This is a diagram showing an example of insertion of the restriction member according to the first embodiment.

[0026] Fig.11 This is a diagram showing an example of a rotor according to the second embodiment.

[0027] Fig.12 This is a diagram showing an example of a rotor according to the second embodiment.

[0028] Fig.13 yes Fig.12 Cross-sectional view along line XIII-XIII.

[0029] Fig.14 This is a diagram showing an example of a reference core plate according to the second embodiment.

[0030] Fig.15 This is a diagram showing an example of a first core plate according to the second embodiment.

[0031] Fig.16 This is a diagram showing an example of a second core plate according to the second embodiment.

[0032] Fig.17 This is a diagram showing an example of a method for manufacturing a rotor according to the second embodiment.

[0033] Fig.18 This is a diagram showing an example of a rotor according to the third embodiment.

[0034] Fig.19 This is a diagram showing an example of a method for manufacturing a rotor according to the third embodiment. DETAILED DESCRIPTION

[0035] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same or equivalent parts in the drawings are marked with the same symbols, and their descriptions are not repeated. In addition, the sizes of the components in each figure do not faithfully represent the actual sizes of the components and the size ratios of the components.

[0036] In addition, in the following description of the motor 100, the direction parallel to the central axis P of the rotor 10, 10A, 10B is referred to as the "axial direction", the direction orthogonal to the central axis P is referred to as the "radial direction", and the direction along the arc centered on the central axis P is referred to as the "circumferential direction". In addition, in the following description, the thickness direction of the core plate 3 and the stacking direction of the core plate 3 are sometimes described, and the thickness direction and the stacking direction are parallel to the axial direction. However, these definitions are not intended to limit the orientation of the rotor 10, 10A, 10B during manufacturing and use.

[0037] In the following description, “same” includes not only the case of being strictly the same but also the range that can be regarded as substantially the same. That is, it only needs to be the same to the extent that the effect of the invention is achieved.

[0038] In addition, in the following description, expressions such as "fixed", "connected" and "mounted" (hereinafter referred to as fixed, etc.) include not only cases where components are directly fixed to each other, but also cases where components are fixed via other components. That is, in the following description, expressions such as fixed include the meaning of direct and indirect fixing of components to each other.

[0039] (Implementation Method 1)

[0040] (motor)

[0041] use Figure 1 An example of the motor 100 according to Embodiment 1 will be described. The motor 100 is an IPM motor.

[0042] like Figure 1As shown, the motor 100 includes a rotor 10, a stator 102, a housing 103, and a shaft 104. The rotor 10 rotates about a central axis P relative to the stator 102. In the present embodiment, the motor 100 is a so-called inner rotor type motor in which the rotor 10 is rotatably located about the central axis P in the cylindrical stator 102.

[0043] The rotor 10 includes a rotor core 1 and a magnet 2. The rotor 10 is located radially inward of the stator 102 and is rotatable about a central axis P relative to the stator 102.

[0044] The stator 102 is housed in the housing 103. In the present embodiment, the stator 102 is cylindrical. The rotor 10 is located radially inward of the stator 102. That is, the stator 102 is arranged to face the rotor 10 in the radial direction.

[0045] The stator 102 includes a stator core 105 and a stator coil 106. The stator coil 106 is wound around the stator core 105. The detailed structure of the stator 102 will be omitted.

[0046] (Rotor)

[0047] like Figure 2 As shown, the rotor 10 has a columnar shape extending along the central axis P. The rotor 10 includes a rotor core 1 and a plurality of magnets 2 .

[0048] (Rotor core and magnet 2)

[0049] like Figure 2 As shown in FIG. 1 , the rotor core 1 has a shaft insertion hole 1 a extending along the central axis P and penetrating therethrough. Figure 1 As shown in FIG. 1 , the shaft 104 is fixed in a state of penetrating the shaft insertion hole 1 a in the axial direction. As a result, the rotor core 1 rotates together with the shaft 104 .

[0050] The rotor core 1 has a plurality of core plates 3 and a plurality of magnet insertion holes 4. The plurality of core plates 3 are stacked in the thickness direction of the core plates 3. Each core plate 3 is a disk-shaped electromagnetic steel plate formed into a predetermined shape.

[0051] The plurality of magnet insertion holes 4 are arranged at predetermined intervals in the circumferential direction. The plurality of magnet insertion holes 4 penetrate the rotor core 1 in the axial direction. When viewed from the axial direction, the plurality of magnet insertion holes 4 are rectangular and are longer in one direction. The plurality of magnet insertion holes 4 include: magnet insertion holes 4 whose length direction is along the outer circumference of the rotor core 1 when viewed from the axial direction; and magnet insertion holes 4 extending from the radial outer peripheral side to the radial inner peripheral side of the rotor core 1 when viewed from the axial direction. The magnets 2 are accommodated in the magnet insertion holes 4. In addition, the plurality of magnet insertion holes 4 may also include magnet insertion holes 4 extending in the radial direction of the rotor core 1 when viewed from the axial direction.

[0052] The magnet 2 is rectangular and extends in the axial direction. The magnet 2 is inserted into the magnet insertion hole 4 along the magnet insertion direction from one side of the axial direction of the rotor 10, and is accommodated in the magnet insertion hole 4. The magnet 2 is fixed relative to the magnet insertion hole 4 by the retaining portion 53 of the first core plate 5 described later.

[0053] Figure 3 This is a diagram showing the rotor 10 and the first core plate 5 as viewed from the axial direction. Figure 4 yes Figure 3 IV-IV line cross-sectional view. Figure 4 As shown, the stacked core plates 3 include a plurality of first core plates 5 and a plurality of second core plates 6 .

[0054] like Figure 4 As shown, a plurality of first core plates 5 are continuously stacked. One of the plurality of first core plates 5 is located at an axial end surface of the rotor 10. In addition, each first core plate 5 has the same structure.

[0055] In addition, if Figure 4 As shown, multiple second core plates 6 are stacked continuously. In addition, the multiple second core plates 6 are located on the magnet insertion direction side relative to the multiple first core plates 5. In addition, each second core plate 6 has the same structure. In addition, the magnet insertion direction is the direction of inserting the magnet 2 into the magnet insertion hole 4. The above-mentioned magnet insertion direction side refers to the front side of the magnet insertion direction.

[0056] (First core board)

[0057] use Figures 3 to 5 An example of the first core plate 5 of the first embodiment is described. Figure 3 As shown, the first core plate 5 has a plurality of first insertion portions 51 , a plurality of receiving portions 52 , and a plurality of holding portions 53 .

[0058] Specifically, the first core plate 5 of the present embodiment has two receiving portions 52 and two retaining portions 53 for one first insertion portion 51. In addition, the structures of the plurality of first insertion portions 51 of the first core plate 5 are the same. In addition, the structures of the receiving portions 52 and retaining portions 53 relative to each first insertion portion 51 are the same. Therefore, below, a first insertion portion 51, a receiving portion 52 relative to the first insertion portion 51, and a retaining portion 53 located between the first insertion portion 51 and the receiving portion 52 are described.

[0059] The first insertion portion 51 is a through hole that penetrates the first core plate 5 in the thickness direction. The magnet 2 is located in the first insertion portion 51. Thus, the first insertion portion 51 constitutes a part of the magnet insertion hole 4. Figure 5As shown, when the first core plate 5 is viewed from the axial direction, the first insertion portion 51 has a shape that is long in one direction. Here, when the first core plate 5 is viewed from the axial direction, the first insertion portion 51 has a shape that is long in one direction perpendicular to the radial direction. In addition, Figure 5 yes Figure 3 An enlarged view of the dotted line portion of .

[0060] The housing portion 52 is a through hole that penetrates the first core plate 5 in the thickness direction. When the first core plate 5 is viewed from the axial direction, the housing portion 52 has a rectangular shape, which is long in one direction perpendicular to the radial direction.

[0061] The housing portion 52 is located in the opposite direction of the protruding direction of the protruding portion 54 relative to the first insertion portion 51 and the protruding portion 54 described later. For example, the protruding direction is radially outward. In this case, the opposite direction is radially inward.

[0062] Specifically, if Figure 5 As shown, when the first core plate 5 is viewed from the axial direction, the receiving portion 52 is located on the opposite side to the inner surface 51a of one of the pair of inner surfaces extending in the longitudinal direction of the first insertion portion 51. That is, the receiving portion 52 is located radially inward relative to the first insertion portion 51.

[0063] The holding portion 53 is a portion of the first core plate 5 that holds the magnet 2 inserted into the magnet insertion hole 4. The holding portion 53 is located between the first insertion portion 51 and the receiving portion 52. Therefore, the receiving portion 52 is located on the opposite side of the magnet 2 with respect to the holding portion 53.

[0064] like Figure 5 As shown, the retaining portion 53 constitutes a part of the inner surface 51a. Moreover, the retaining portion 53 has a protrusion 54 on the magnet 2 side. That is, the retaining portion 53 of the first core plate 5 has a protrusion 54, which is located on the inner surface 51a of the first insertion portion 51, and when the rotor 10 is observed from the axial direction, it protrudes inward of the first insertion portion 51 and the second insertion portion 61 described later and contacts the magnet 2. The protrusion 54, which is a part of the retaining portion 53, constitutes a part of the inner surface of the magnet insertion hole 4. The protrusion 54 protrudes to the side opposite to the storage portion 52. For example, the protrusion 54 protrudes radially outward. In addition, the protruding direction of the protrusion 54 is not limited to the radial outward.

[0065] In addition, if Figure 4 As shown, the first insertion portions 51 of the plurality of first core plates 5 are arranged in the axial direction. The first insertion portions 51 of the plurality of stacked first core plates 5 constitute a part of the magnet insertion hole 4.

[0066] In addition, if Figure 4As shown, each of the plurality of first core plates 5 has a housing portion 52. The plurality of housing portions 52 are arranged in the axial direction. That is, the housing portion 52 of the first core plate 5 in one axial direction is connected to the housing portion 52 of the first core plate 5 in the other axial direction.

[0067] In addition, if Figure 4 As shown, the plurality of retaining portions 53 are arranged in the axial direction. That is, when the first core plate 5 is viewed from the axial direction, the retaining portion 53 of the first core plate 5 on one side of the axial direction overlaps with the retaining portion 53 of the first core plate 5 on the other side of the axial direction. Furthermore, the plurality of protrusions 54 are arranged in the axial direction.

[0068] (Second core board)

[0069] use Figure 6 An example of the second core plate 6 according to the first embodiment will be described. Figure 6 This is a diagram showing the second core plate 6 stacked on the rotor core 1 as viewed from the axial direction.

[0070] like Figure 4 As shown, the second core plate 6 is stacked adjacent to the first core plate 5 in the magnet insertion direction of the magnet 2. In addition, the second core plate 6 has a second insertion portion 61 that constitutes a part of the magnet insertion hole 4. Specifically, as Figure 6 As shown, the second core plate 6 has a second inserting portion 61 and a covering portion 62 .

[0071] The second insertion portion 61 is a through hole that penetrates the second core plate 6 in the thickness direction. The first insertion portion 51 of the first core plate 5 and the second insertion portion 61 of the second core plate 6 are arranged in the axial direction. That is, when the rotor 10 is observed from the axial direction, the first insertion portion 51 of the first core plate 5 and the second insertion portion 61 of the second core plate 6 overlap. In this way, the second insertion portion 61 constitutes a part of the magnet insertion hole 4 of the rotor core 1.

[0072] When the rotor 10 is viewed from the axial direction, the covering portion 62 overlaps with the housing portion 52 of the first core plate 5. Therefore, the second core plate 6 stacked adjacent to the first core plate 5 covers the housing portion 52 in the axial direction.

[0073] (Storage section and restriction member)

[0074] The plurality of core plates 3 include a plurality of first core plates 5 . Furthermore, the plurality of first core plates 5 each include a storage portion 52 .

[0075] The storage portion 52 is a through hole that is located in the opposite direction to the protruding direction of the protruding portion 54 relative to the protruding portion 54 of the first core plate 5 and penetrates the plurality of first core plates 5 in the thickness direction. In addition, the storage portion 52 is open at the axial end face of the rotor core 1. In addition, the storage portion 52 may also be connected to a portion of the first insertion portion 51 of the first core plate 5. That is, the storage portion 52 may also be a portion of the first insertion portion 51 of the first core plate 5.

[0076] like Figure 4 As shown in FIG. 1 , the rotor 10 includes a limiting member 7. The limiting member 7 is housed in the housing portion 52 at a position in the opposite direction relative to the protrusion 54, and limits the displacement of the retaining portion 53 and the protrusion 54 in the opposite direction. In the present embodiment, the limiting member 7 is a rod inserted into the housing portion 52. In addition, the limiting member 7 may be a resin that has fluidity in the initial state and can be cured after injection.

[0077] When the rotor 10 is viewed from the axial direction, for example, the limiting member 7 has a rectangular shape. Figure 4 As shown, the restricting member 7 is in contact with the inner surface of the housing portion 52 .

[0078] In addition, if Figure 4 As shown, the axial length of the restricting member 7 is the same as the axial thickness of the plurality of first core plates 5. However, the axial length of the restricting member 7 may be different from the axial thickness of the plurality of first core plates 5.

[0079] (Method of Manufacturing Rotor 10)

[0080] use Figures 7 to 10 An example of a method for manufacturing the rotor 10 according to the first embodiment will be described. Figure 7 As shown, the method for manufacturing the rotor 10 includes a core plate forming step S1 , a core plate laminating step S2 , a magnet inserting step S3 , a restricting member accommodating step S4 , and a magnetizing step S5 .

[0081] The core plate forming step S1 is a step of forming the first core plate 5 and the second core plate 6. The first core plate 5 is formed by the core plate forming step S1, and the first core plate 5 has: a plurality of first insertion portions 51 constituting a part of the magnet insertion hole 4; a receiving portion 52 located radially inward relative to the first insertion portion 51; and a retaining portion 53 located between the first insertion portion 51 and the receiving portion 52.

[0082] Furthermore, the first core plate 5 is provided with a protrusion 54 which constitutes a portion of the inner surface of the magnet insertion hole 4 and protrudes inwardly of the first insertion portion 51 and contacts the magnet 2 when the rotor 10 is viewed from the axial direction.

[0083] Furthermore, the core plate forming step S1 forms the second core plate 6 which is stacked adjacent to the first core plate 5 in the magnet insertion direction of the magnet 2 and has the second insertion portion 61 constituting a part of the magnet insertion hole 4 .

[0084] Here, the storage portion 52 of the first core plate 5 is a through hole, and is a space in the state before the limiting component 7 is stored. Therefore, in the state where the storage portion 52 does not store the limiting component 7, when the retaining portion 53 and the protruding portion 54 are pressed in the above-mentioned opposite direction, the retaining portion 53 is deformed in the above-mentioned opposite direction. That is, in the case where the storage portion 52 does not store the limiting component 7, the storage portion 52 is a displacement allowing portion that allows the retaining portion 53 and the protruding portion 54 to be displaced in the above-mentioned opposite direction. Therefore, the core plate forming process is also a process of forming a displacement allowing portion in the first core plate 5, and the displacement allowing portion is located in the opposite direction opposite to the protruding direction of the protruding portion 54 relative to the protruding portion 54, and allows the protruding portion 54 to be displaced in the above-mentioned opposite direction.

[0085] The core plate stacking step S2 is a step of stacking a plurality of core plates 3 including a first core plate 5 and a second core plate 6 in a predetermined order in the thickness direction. Specifically, the plurality of second core plates 6 are stacked adjacent to the plurality of first core plates 5 in the magnet insertion direction. By completing the core plate stacking step S2, a columnar rotor core 1 having a magnet insertion hole 4 extending in the axial direction is obtained.

[0086] The magnet insertion step S3 is a step of inserting the magnet 2 into the magnet insertion hole 4. Figure 8 and Fig. 9 An example of the magnet insertion step S3 is described below. Figure 8 As shown, in a state where the magnet 2 is not inserted into the magnet insertion hole 4 , the holding portion 53 and the protruding portion 54 protrude toward the inside of the magnet insertion hole 4 .

[0087] like Figure 8 As shown in FIG. 1 , when the magnet 2 is inserted into the magnet insertion hole 4, the front end of the magnet 2 contacts the protrusion 54, whereby the holding portion 53 and the protrusion 54 are pressed in the direction of the receiving portion 52, that is, in the opposite direction described above. That is, the holding portion 53 is deformed radially inward through the space of the receiving portion 52. As a result, the holding portion 53 and the protrusion 54 are displaced in the opposite direction described above. The magnet 2 can be smoothly inserted by the deformation of the holding portion 53 and the displacement of the protrusion 54.

[0088] On the other hand, the holding portion 53 has elastic restoring force. Fig. 9 As shown, the protrusion 54 in contact with the magnet 2 presses the magnet 2 toward the inside of the magnet insertion hole 4, that is, the protruding direction of the protrusion 54, by the elastic restoring force. As a result, the magnet 2 inserted into the magnet insertion hole 4 is pressed against the inner surface of the magnet insertion hole 4 on the side opposite to the retaining portion 53 across the magnet 2. As a result, the magnet 2 is retained in the magnet insertion hole 4.

[0089] The limiting member storage step S4 is a step of storing the limiting member 7 for limiting the displacement of the protruding portion 54 in the reverse direction in the storage portion 52, that is, in the displacement allowing portion. Fig.10As shown, after the magnet insertion step S3, the rod-shaped limiting member 7 is inserted into the storage portion 52 of the plurality of first core plates 5 in the axial direction. Fig.10 As shown, one axial end of the restricting member 7 is thinner than the other axial end.

[0090] In the limiting component storage step S4, axial pressure is applied to the limiting component 7 during insertion. That is, the limiting component 7 is pressed into the storage portion 52. Specifically, the limiting component 7 is inserted axially into the storage portion 52 from the thinner front end. When the first core plate 5 is observed from the axial direction, a portion of the limiting component 7 has a thickness greater than the inner diameter of the short side direction of the storage portion 52. Fig.10 The state where the restriction member 7 is in contact with the inner surface of the housing portion 52 during the insertion is shown. In this way, the restriction member 7 is pushed in while the outer surface of the restriction member 7 and the inner surface of the housing portion 52 are rubbed against each other.

[0091] By the press-fitting, the outer surface of the restricting member 7 accommodated in the accommodating portion 52 and the inner surface of the accommodating portion 52 are pressed against each other. Thus, the restricting member 7 is reliably fixed in the accommodating portion 52.

[0092] After the restriction member storing step S4 , the magnetizing step S5 is performed. The magnetizing step S5 is a step of magnetizing the magnet 2 inserted into the magnet insertion hole 4 .

[0093] When magnetizing the magnet 2 inserted into the magnet insertion hole 4, if the storage portion 52 does not accommodate the limiting component 7, the protrusion 54 may be deformed in the above-mentioned opposite direction due to the space of the storage portion 52. Here, the rotor 10 of embodiment 1 has a limiting component that is accommodated in the storage portion 52 at a position in the above-mentioned opposite direction relative to the protrusion 54 and limits the displacement of the protrusion 54 in the above-mentioned opposite direction. According to this structure, when the magnet 2 is magnetized, the displacement of the protrusion 54 in the above-mentioned opposite direction is suppressed compared with the case where the limiting component 7 is not accommodated in the storage portion 52. Therefore, when the magnet 2 is magnetized, the plastic deformation of the protrusion 54 in the above-mentioned opposite direction can be prevented. Therefore, the rotor 10 that can suppress the reduction of the holding force of the magnet 2 inserted into the magnet insertion hole 4 is realized.

[0094] In addition, in the rotor 10 of embodiment 1, the plurality of core plates 3 have a plurality of first core plates 5. The plurality of first core plates 5 respectively have a storage portion 52. The storage portion 52 is a through hole that is located in the opposite direction to the protrusion 54 of the first core plate 5 and penetrates the plurality of first core plates 5 in the thickness direction. The limiting component 7 is located in the through hole. By the limiting component 7 located in the storage portion 52, the displacement of the protrusion 54 in the plurality of first core plates 5 in the opposite direction is suppressed. Therefore, the magnet 2 inserted into the magnet insertion hole 4 can be more reliably maintained.

[0095] The housing portion 52 is open at the axial end surface of the rotor core 1. According to this configuration, the work of filling the housing portion 52 with the restriction member 7 can be easily performed.

[0096] The restricting member 7 includes a rod inserted into the housing portion 52. According to this configuration, the restricting member 7 can be formed in the housing portion 52 by a simple operation of inserting the rod. Thus, the rotor 10 in which the displacement of the protruding portion 54 of the first core plate 5 is suppressed can be easily manufactured.

[0097] Thus, the motor 100 includes the rotor 10 of the first embodiment and the stator 102 including the stator coil 106 and the stator core 105. With this structure, the rotor 10 has a holding force for holding the magnet 2 inserted into the magnet insertion hole 4. Therefore, a motor that is less likely to fail can be provided.

[0098] Moreover, according to the manufacturing method of the present invention, the magnet 2 is inserted into the magnet insertion hole 4 before the limiting component 7 is stored in the storage portion 52. Therefore, compared with inserting the magnet 2 into the magnet insertion hole 4 after the limiting component 7 is stored, the protrusion 54 is easily displaced in the opposite direction of the protruding direction, and the magnet 2 can be smoothly inserted into the magnet insertion hole 4.

[0099] Furthermore, after the restricting members 7, 7A, 7B are housed in the housing portion 52, the magnets 2 in the magnet insertion holes 4 are magnetized, so that the displacement of the protrusions 54 in the reverse direction is suppressed. Therefore, the rotor 10 in which the magnets 2 inserted in the magnet insertion holes 4 are held can be manufactured.

[0100] (Implementation Method 2)

[0101] Next, refer to Figures 11 to 17 An example of a rotor 10A according to Embodiment 2 is described. The rotor 10A according to Embodiment 2 is different from the rotor 10 according to Embodiment 1 in the structure of the first core plate and the second core plate, and other aspects are the same. Hereinafter, the same reference numerals are given to the same structures as those in Embodiment 1, and their description is omitted.

[0102] Fig.11 This is a diagram of a rotor 10A according to the second embodiment as viewed from the axial direction. Fig.12 yes Fig.11 An enlarged view of the portion surrounded by the dotted line. Fig.13 yes Fig.12 Cross-sectional view along line XIII-XIII.

[0103] like Fig.13As shown, in the rotor core 1A, a plurality of core plates 3 are stacked in the thickness direction. The plurality of core plates 3 include a basic core plate 80, a first core plate 50, and a second core plate 60. The inner surface of the magnet insertion hole 4 of the rotor core 1A includes the inner surface of the basic insertion portion 801 of the basic core plate 80, the inner surface of the first insertion portion 501 of the first core plate 50, and the inner surface of the second insertion portion 601 of the second core plate 60.

[0104] like Fig.13 As shown, the rotor core 1A has a lamination group 31 including a basic core plate 80, a first core plate 50, and a second core plate 60 which are laminated in a predetermined order. A plurality of lamination groups 31 are laminated in the axial direction.

[0105] In this embodiment, the stacking group 31 includes a first core plate 50, a second core plate 60, and a plurality of basic core plates 80. The second core plate 60 is stacked adjacent to the first core plate 50 on one axial side. A plurality of basic core plates 80 are stacked continuously on the other axial side of the second core plate 60.

[0106] Fig.14 It is located at the axial direction Fig.11 An enlarged view of the basic core panel 80 is shown in the dashed line portion. Fig.15 It is located at the axial direction Fig.11 FIG. 5 is an enlarged view of the first core plate 50 of the dotted line portion. Fig.16 It is located at the axial direction Fig.11 The dotted line portion of the second core plate 60 is an enlarged view. Figures 14 to 16 In FIG. 4 , the dotted line indicates an example of the position of the magnet 2 inserted into the magnet insertion hole 4 .

[0107] like Fig.14 As shown, the basic core plate 80 has a basic insertion portion 801. The basic insertion portion 801 is a through hole that penetrates the basic core plate 80 in the thickness direction. The basic insertion portion 801 constitutes a part of the magnet insertion hole 4. Here, when the basic core plate 80 is viewed from the axial direction, the basic insertion portion 801 is a shape that is long in a direction perpendicular to the radial direction.

[0108] like Fig.15 As shown, the first core plate 50 has a first insertion portion 501. The first insertion portion 501 is a through hole that penetrates the first core plate 50 in the thickness direction. The first insertion portion 501 constitutes a part of the magnet insertion hole 4. Here, when the first core plate 50 is observed from the axial direction, the first insertion portion 501 of the first core plate 50 is a shape that is longer in a direction perpendicular to the radial direction. In Embodiment 1 and Embodiment 2, the shape of the first insertion portion is different.

[0109] The first core plate 50 has a protruding portion 502 and a pair of slits 503. The protruding portion 502 protrudes toward the inside of the first insertion portion 501 and contacts the magnet 2. The pair of slits 503 are provided with a base end portion 504 of the protruding portion 502 interposed therebetween.

[0110] The pair of slits 503 extend in the protruding direction of the protruding portion 502 relative to the base end portion 504. Here, the pair of slits 503 extend in the radial direction relative to the base end portion 504. The portion sandwiched by the slits 503 constitutes the protruding portion 502. In addition, the direction in which the pair of slits 503 extend is not limited to the radial direction.

[0111] like Fig.16 As shown, the second core plate 60 has a second insertion portion 601. The second insertion portion 601 is a through hole that penetrates the second core plate 60 in the thickness direction. The second insertion portion 601 constitutes a part of the magnet insertion hole 4. When observing the second core plate 60 from the axial direction, the second insertion portion 601 of the second core plate 60 is a shape that is longer in one direction. In Embodiment 1 and Embodiment 2, the shape of the second insertion portion is different.

[0112] When the rotor 10A is viewed from the axial direction, the second insertion portion 601 overlaps with the protrusion 502 of the first core plate 50. In addition, when the rotor 10A is viewed from the axial direction, the protrusion 502 of the first core plate 50 partially overlaps with the position of the magnet 2 inserted into the magnet insertion hole 4. Fig.16 As shown, the second insertion portion 601 has a recessed portion 602 located in a portion recessed in a direction opposite to the protruding direction of the protruding portion 502. When the rotor 10A is viewed from the axial direction, the portion of the protruding portion 502 from the base end portion 504 to the tip end portion 505 is located inside the recessed portion 602.

[0113] like Fig.13 As shown, when the magnet 2 is inserted into the magnet insertion hole 4, the protrusion 502 is bent at the base end 504 in the thickness direction of the first core plate 50. The front end 505 of the protrusion 502 is located in the magnet insertion hole 4 on the magnet insertion direction side relative to the base end 504 of the protrusion 502. The front end 505 of the protrusion 502 is clamped by the magnet 2 and the inner surface of the basic insertion portion 801 of the basic core plate 80.

[0114] (Storage section and restriction member)

[0115] In the first embodiment, the first core plate 5 has the storage portion 52 , whereas in the second embodiment, the second core plate 60 has the storage portion 603 .

[0116] like Fig.13As shown, the storage portion 603 is adjacent to the protrusion 502 on the magnet insertion direction side. Specifically, when observing the rotor 10A from the axial direction, the storage portion 603 is a portion of the second insertion portion 601 of the second core plate 60 that overlaps with the protrusion 502 of the first core plate 50. For example, the recess 602 of the second insertion portion 601 can be used as the storage portion 52. The storage portion 603 is connected to the magnet insertion hole 601. That is, the inner surface of the storage portion 603 is connected to the inner surface of the magnet insertion hole 601.

[0117] Moreover, if Fig.13 As shown, the rotor 10A of the second embodiment has a limiting component 7A. When the rotor 10A is observed from the axial direction, the limiting component 7A is housed in the housing portion 603. Here, it is not necessary to completely fill the housing portion 603 with the limiting component 7A, and a portion of the limiting component 7A may protrude out of the housing portion 603. In addition, a portion of the housing portion 603 may not be filled with the limiting component 7A. Specifically, the limiting component 7A is located in the second core plate 60 in the opposite direction relative to the front end of the protrusion 502. The limiting component 7A limits the displacement of the protrusion 502 in the opposite direction. The details of the limiting component 7A will be described later.

[0118] (Method for manufacturing rotor)

[0119] Next, use Fig.17 An example of a method for manufacturing the rotor 10A according to the second embodiment will be described. Figure 7 Similarly, the process includes a core plate forming step S1 , a core plate laminating step S2 , a magnet inserting step S3 , a restricting member accommodating step S4 , and a magnetizing step S5 .

[0120] The core plate forming step S1 is a step of forming a basic core plate 80, a first core plate 50, and a second core plate 60. Through the core plate forming step S1, a basic core plate 80 having a basic insertion portion 801 is formed. In addition, a first core plate 50 having a first insertion portion 501, a protrusion 502, and a pair of slits 503 is formed. In addition, a second core plate 60 having a second insertion portion 601 and a storage portion 603 is formed.

[0121] Here, before the limiting component 7A is stored, the storage portion 603 is a space. Therefore, in a state where the storage portion 603 does not store the limiting component 7A, when the protrusion 502 is pressed in the above-mentioned opposite direction, the protrusion 502 may be deformed in the above-mentioned opposite direction. That is, the storage portion 603 is a displacement-allowing portion that allows the protrusion 502 to be displaced in the above-mentioned opposite direction when the storage portion 603 does not store the limiting component 7A. Therefore, the core plate forming process is also a process of forming a displacement-allowing portion that allows the protrusion 502 to be displaced in the above-mentioned opposite direction in the second core plate 60.

[0122] The core plate stacking step S2 is a step of stacking the basic core plate 80, the first core plate 50, and the second core plate 60 in a predetermined order in the thickness direction. The core plate stacking step S2 obtains the cylindrical rotor core 1A having the magnet insertion hole 4 extending in the axial direction.

[0123] The magnet insertion step S3 is a step of inserting the magnet 2 into the magnet insertion hole 4. Fig.17 As shown, when the magnet 2 is inserted into the magnet insertion hole 4, the front end of the magnet 2 presses the protrusion 502. As a result, the protrusion 502 is bent in the magnet insertion direction. By pushing the magnet 2 into the magnet insertion hole 4, the front end 505 of the protrusion 502 is sandwiched between the magnet 2 and the inner surface of the magnet insertion hole 4.

[0124] The limiting member storage step S4 is a step of storing the limiting member 7A in the storage portion 603, that is, in the displacement allowance portion. Fig.13 As shown, after the magnet inserting step S3 , the housing portion 603 of the second core plate 60 is filled with resin.

[0125] In the second embodiment, the limiting member 7A is a resin that has fluidity in the initial state and can be cured after being injected into the storage portion 603. For example, the limiting member 7A is an adhesive. In addition, the limiting member 7A can be a resin that is cured by evaporation of components, a resin that is cured by light energy or heat energy, or a resin that is cured by a chemical reaction.

[0126] Specifically, in the limiting member storing step S4, the limiting member 7A is injected into the storing portion 603. For example, an injector (not shown) is inserted from the axial end surface of the rotor core 1A into the magnet insertion hole 4. The limiting member 7A is injected into the storing portion 603 by the injector (not shown). As a result, the space of the storing portion 603 is filled with resin.

[0127] After the restriction member storing step S4 , the magnetizing step S5 is performed. The magnetizing step S5 is a step of magnetizing the magnet 2 inserted into the magnet insertion hole 4 .

[0128] When magnetizing the magnet 2 inserted into the magnet insertion hole 4, if the storage portion 603 does not accommodate the limiting component 7A, the protrusion 502 may be deformed in the opposite direction due to the space of the storage portion 603. However, when the rotor 10A is observed from the axial direction, the second core plate 60 of the second embodiment has a storage portion 603 at a position overlapping with the protrusion 502 of the first core plate 50. According to this structure, the limiting component 7A in the storage portion 603 of the second core plate 60 suppresses the displacement of the protrusion 502 in the direction of the storage portion 603. Therefore, the magnet 2 inserted into the magnet insertion hole 4 can be more reliably held by the protrusion 502.

[0129] In the second embodiment, the limiting member 7A is a resin filled in the housing portion 603. According to this structure, by filling the resin, the housing portion 603 can be filled with the limiting member 7A. Thus, the rotor 10A in which the displacement of the protruding portion 502 of the first core plate 50 is suppressed can be easily manufactured. In addition, the limiting member 7A may be a rod material or may not be a resin.

[0130] (Implementation method 3)

[0131] Next, refer to Fig.18 , Fig.19 An example of a rotor 10B of Embodiment 3 is described. The rotor 10B of Embodiment 3 is different from the rotor 10 of Embodiment 1 in that it has a third core plate 9. In other respects, the structure of Embodiment 3 is the same as that of Embodiment 1. Hereinafter, the same reference numerals are given to the same structures as those of Embodiment 1, and description thereof is omitted.

[0132] like Fig.18 As shown, the rotor core 1B of the third embodiment includes a third core plate 9. The third core plate 9 includes a third insertion portion 91 and a covering portion 92. The third core plate 9 is stacked adjacent to the first core plate 5 at an axial end portion of the rotor core 1B.

[0133] The third insertion portion 91 is a through hole that penetrates the third core plate 9 in the thickness direction. The magnet 2 is located in the third insertion portion 91. The third insertion portion 91 constitutes a part of the magnet insertion hole 4.

[0134] The covering portion 92 axially covers at least a portion of the through hole of the first core plate 5 constituting the housing portion 52. The covering portion 92 has a caulking portion recessed in the axial direction. In the third embodiment, the caulking portion is the restricting member 7B.

[0135] like Fig.18 As shown, when observing the second core plate 6 from the axial direction, the rivet portion is a portion of the cover portion 92 that is recessed on one surface of the second core plate 6 and protrudes on the other surface at a position that overlaps with the receiving portion 52. Specifically, the rivet portion protrudes into the receiving portion 52.

[0136] Moreover, if Fig.18 As shown, the portion of the riveted portion protruding toward the first core plate 5 contacts the inner surface of the storage portion 52. Thus, in Embodiment 3, the limiting component 7B is a riveted portion protruding toward the first core plate 5 in the covering portion 92 of the third core plate 9. The third core plate 9 is a steel plate, and therefore the limiting component 7B of this embodiment is metal.

[0137] In the method for manufacturing the rotor 10B of the third embodiment, the third core plate 9 is formed in the core plate forming step S1 . In the core plate laminating step S2 , the third core plate 9 is laminated adjacent to the first core plate 5 at the axial end of the rotor 10B.

[0138] In addition, the manufacturing method of the third embodiment is different from the first embodiment in that the restricting member 7B is formed using a caulking tool 70 in the restricting member storage step S4. Fig.19 As shown, the front end of one side of the caulking tool 70 abuts against the cover portion 92. The front end of the other side of the caulking tool 70 is pressed in the axial direction. Thus, the restricting member 7B protruding into the housing portion 52 is formed.

[0139] In addition, the magnet inserting step S3 and the magnetizing step S5 of the third embodiment are the same as those of the first embodiment.

[0140] In the rotor 10B of the third embodiment, when the first core plate 5 is observed from the axial direction, the limiting component 7B is a riveted portion of the covering portion 92 that protrudes toward the inside of the housing portion 52 at a position that overlaps with the housing portion 52. According to this structure, the riveted portion of the covering portion 92 located in the housing portion 52 limits the displacement of the protrusion 54 in the above-mentioned opposite direction. Thus, the rotor 10B in which the displacement of the protrusion 54 of the first core plate 5 is suppressed can be easily manufactured. Therefore, the rotor 10B that can suppress the reduction of the holding force of the magnet 2 inserted in the magnet insertion hole 4 is realized.

[0141] As described above, the rotors 10 , 10A, and 10B of the first, second, and third embodiments have the following features.

[0142] (1) The rotor 10, 10A, 10B of the embodiment includes: a columnar rotor core 1, 1A, 1B including a plurality of core plates 3 stacked in the thickness direction and a magnet insertion hole 4 extending in the axial direction; and a magnet 2 inserted into the magnet insertion hole 4. The plurality of core plates 3 include: a first core plate 5, 50; and a second core plate 6, 60, which is stacked adjacent to the first core plate 5, 50 in the magnet insertion direction of the magnet 2 and has an insertion portion (second insertion portion 61, 601) constituting a portion of the magnet insertion hole 4. The first core plate 5, 50 includes a protrusion 54, 502 constituting a portion of the inner surface of the magnet insertion hole 4, and when the rotor 10, 10A, 10B is viewed from the axial direction, the protrusion 54, 502 protrudes inward of the insertion portion and contacts the magnet 2. In addition, the above-mentioned rotors 10, 10A, 10B have: a receiving portion 52, 603, which is located in the opposite direction of the protruding direction of the above-mentioned protrusions 54, 502 relative to the above-mentioned protrusions 54, 502 when the above-mentioned rotors 10, 10A, 10B are observed from the above-mentioned axial direction in the above-mentioned first core plate 5 or the above-mentioned second core plate 60; and a limiting component 7, 7A, 7B, which is received in the above-mentioned receiving portion 52, 603 at a position in the above-mentioned opposite direction relative to the above-mentioned protrusions 54, 502, and limits the displacement of the above-mentioned protrusions 54 in the above-mentioned opposite direction.

[0143] (2) In the rotor 10, 10B described in (1), the plurality of core plates 3 include the plurality of first core plates 5. The plurality of first core plates 5 each include the housing portion 52. The housing portion 52 is a through hole that is located in the opposite direction to the protrusion 54 of the first core plate 5 and penetrates the plurality of first core plates 5 in the thickness direction. The limiting member 7, 7B is located in the through hole.

[0144] (3) In the rotor 10A described in (1), when the rotor core 1B is viewed from the axial direction, the second core plate 60 has the housing portion 603 at a position overlapping the protruding portion 502 of the first core plate 50 .

[0145] (4) In the rotor 10 described in (2), the through hole opens at the axial end surface of the rotor core 1 .

[0146] (5) In the rotor 10 or 10A according to any one of (1) to (4), the restriction member 7 or 7A includes a rod material inserted into the housing portion 52 .

[0147] (6) In the rotor 10 or 10A described in (1) or (5), the restriction member 7 or 7A is a resin filled in the housing portion 52 .

[0148] (7) In the rotor 10B described in (2), there is a third core plate 9, which is stacked adjacent to the first core plate 5 at the axial end of the rotor core 1B and has a covering portion 92 that covers at least a portion of the through hole in the axial direction. The limiting component 7B is a covering portion 92 that protrudes into the interior of the through hole at least at a position that overlaps with the through hole when the first core plate 5 is observed from the axial direction.

[0149] (8) A motor includes: the rotor 10 , 10A, 10B according to any one of (1) to (7); and a stator including a stator coil and a stator core.

[0150] (9) The manufacturing method of the rotor 10, 10A, 10B of the above-mentioned embodiment is a method for manufacturing the rotor 10, 10A, 10B, wherein the rotor 10, 10A, 10B comprises: a cylindrical rotor core 1, 1A, 1B having a plurality of core plates 3 stacked in the thickness direction and a magnet insertion hole 4 extending in the axial direction; and a magnet 2 inserted into the magnet insertion hole 4. The manufacturing method comprises: a core plate forming step, forming a first core plate 5, 50 and a second core plate 6, 60, wherein the second core plate 6, 60 is adjacently stacked relative to the first core plate 5, 50 in the magnet insertion direction of the magnet 2 and has an insertion portion (second insertion portion 61, 601) constituting a part of the magnet insertion hole 4, and a protrusion 54, 502 is formed on the first core plate 5, 50, and a displacement allowance portion is formed on the first core plate 5, 50 or the second core plate 6, 60, wherein the protrusion 54, 502 constitutes a part of the inner surface of the magnet insertion hole 4, and when the rotor 10, 10A, 10B is observed from the axial direction, the protrusion 54, 502 protrudes in the direction inside the insertion portion and contacts the magnet 2, and the displacement allowance portion is located relative to the protrusion 54, 502 in the opposite direction to the protrusion direction of the protrusion 54, 502 , and allowing the above-mentioned protrusions 54, 512 to be displaced in the above-mentioned opposite direction; a core plate stacking process, stacking the above-mentioned multiple core plates 3 including the above-mentioned first core plates 5, 50 and the above-mentioned second core plates 6, 60 in the thickness direction, thereby obtaining the above-mentioned columnar rotor core 1, 1A, 1B having the above-mentioned magnet insertion hole 4 extending in the axial direction; a magnet insertion process, inserting the above-mentioned magnet 2 into the above-mentioned magnet insertion hole 4 of the above-mentioned rotor core 1, 1A, 1B; a limiting component storage process S4, after the above-mentioned magnet insertion process, the limiting components 7, 7A, 7B that limit the displacement of the above-mentioned protrusions 54, 512 in the above-mentioned opposite direction are stored in the above-mentioned displacement allowing portion on the above-mentioned first core plates 5, 50 or the above-mentioned second core plates 6, 60; and a magnetization process, after the above-mentioned limiting component storage process S4, magnetizing the above-mentioned magnet 2 inserted in the above-mentioned magnet insertion hole 4.

[0151] (Other embodiments)

[0152] The embodiments of the present invention have been described above, but the above embodiments are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above embodiments, and the above embodiments can be appropriately modified and implemented within the scope of the present invention.

[0153] In the above-mentioned embodiment 1, the storage portion 52 of the first core plate 5 located at the end face of the rotor core 1 is a through hole that opens at the axial end face of the rotor core 1 and penetrates the first core plate 5 in the thickness direction. However, the storage portion of the first core plate located at the end face of the rotor core may be a recessed portion instead of penetrating the first core plate in the thickness direction.

[0154] In the second embodiment, when the rotor 10A is viewed axially, the second core plate 60 has the housing portion 603 at a position overlapping with the protrusion 502 of the first core plate 50. However, when the rotor is viewed axially, the housing portion may have a portion overlapping with the protrusion of the first core plate and a portion not overlapping.

[0155] In the above-mentioned first embodiment, the limiting member 7 is a resin rod inserted into the storage portion 52. However, in the first embodiment, the rod is not limited to the resin, and may be, for example, metal. In addition, the limiting member is not limited to the rod, and may be a resin that has fluidity in the initial state and solidifies after injection. In addition, as the limiting member, the rod and the above-mentioned resin may be used at the same time.

[0156] In the above-mentioned first embodiment, one rod is inserted into one housing portion 52. However, a plurality of rods may be inserted into one housing portion.

[0157] In the second embodiment, liquid is injected into the storage portion 603 of the second core plate 60. However, a rod may be inserted into the storage portion. Furthermore, the restriction member may be made of both the rod and the resin.

[0158] In the second embodiment, the storage portion 603 of the second core plate 60 is filled with resin. However, the storage portion of the second core plate may be filled with a material other than resin. For example, the storage portion of the second core plate may be filled with a metal or non-metal material.

[0159] In the second embodiment, the restricting member 7A is injected into the housing portion 603 of the second core plate 60. However, in the injection step, the restricting member may be injected into a space other than the housing portion of the magnet insertion hole.

[0160] In the second embodiment, the stacking group 31 includes one first core plate 50, one second core plate 60, and a plurality of basic core plates 80. However, the stacking group may include a plurality of first core plates, a plurality of second core plates, or a single basic core plate.

[0161] In the above-mentioned second embodiment, the second core plate 60 has the recessed portion 602. However, the second core plate 60 may not have the recessed portion.

[0162] The rotor core 1B of the third embodiment has a third core plate 9. Here, the third core plate 9 before the caulking portion is formed may be the same shape as the second core plate 6. That is, the second core plate may be stacked adjacent to the first core plate at the end portion in the axial direction of the rotor, and the caulking portion may be formed on the second core plate.

[0163] In the third embodiment, the caulking portion is the restricting member 7B. However, the caulking portion may protrude into the housing portion and the housing portion may be filled with resin.

[0164] In the first and third embodiments, the portion of the second core plate 6 overlapping the housing portion 52 of the first core plate 5 does not penetrate when the rotor 10 and 10B are viewed axially. However, the portion of the second core plate overlapping the housing portion of the first core plate may penetrate when the rotor is viewed axially.

[0165] In the above-mentioned Embodiments 1 and 3, the plurality of first core plates 5 are stacked continuously. However, the plurality of first core plates 5 may not be stacked continuously.

[0166] In the above-mentioned Embodiments 1 and 3, the plurality of second core plates 6 are stacked continuously. However, the plurality of second core plates 6 may not be stacked continuously.

[0167] In the above-mentioned embodiments 1 and 3, the storage portion 52 is located radially inward relative to the first insertion portion 51. However, the storage portion only needs to be located on the side opposite to the magnet with respect to the first insertion portion separated by the retaining portion. That is, when viewed from the axial direction, the storage portion only needs to be located on one side or the other side of the circumferential direction of the first core plate relative to the first insertion portion that constitutes a part of the magnet insertion hole extending radially of the rotor core.

[0168] In the above-mentioned Embodiments 1 and 3, the first core plate 5 has two receiving portions 52 for one first insertion portion 51. However, the first core plate may have one, three, or more than three receiving portions for one first insertion portion.

[0169] In the above-mentioned Embodiments 1 and 3, the first core plate 5 has the housing portion 52 for all the first insertion portions 51. However, the first core plate may have the housing portion for a part of the first insertion portions.

[0170] In the above-mentioned Embodiments 1 and 3, the first core plate 5 has the holding portion 53 for all the first insertion portions 51. However, the first core plate may have the holding portion for a part of the first insertion portions.

[0171] In the above-mentioned Embodiments 1 and 3, the first core plate 5 has one storage portion 52 for one holding portion 53. However, the number of holding portions may be different from the number of storage portions.

[0172] In the above-mentioned embodiments 1 and 3, the storage portion 52 is rectangular when viewed from the axial direction. However, the through hole of the storage portion may be in a shape other than a rectangle. The through hole may be in any shape as long as it can deform the holding portion in the arrangement direction of the holding portion and the storage portion.

[0173] In the above-mentioned Embodiments 1 and 3, the plurality of storage sections 52 have the same shape. However, some of the storage sections may have different shapes.

[0174] Availability in production

[0175] The present invention can be used for a rotor of a motor.

[0176] Explanation of symbols

[0177] 100—motor, 102—stator, 103—housing, 104—shaft, 105—stator core, 106—stator coil, 10, 10A, 10B—rotor, 1, 1A, 1B—rotor core, 1a—shaft insertion hole, 2—magnet, 3—core plate, 31—stacked group, 4—magnet insertion hole, 5, 50—first core plate, 51, 501—first insertion portion, 51a—inner surface, 52—storage portion (displacement allowance portion), 53—holding portion , 54, 502—protrusion, 503—slit, 504—base end, 505—front end, 6, 60—second core plate, 61, 601—second insertion portion, 62—covering portion, 602—recess, 603—storage portion (displacement allowing portion), 7, 7A, 7B—limiting component, 70—riveting tool, 80—basic core plate, 801—basic insertion portion, 9—third core plate, 91—third insertion portion, 92—covering portion, P—center axis.

Claims

1. A rotor comprising: a columnar rotor core having a plurality of core plates stacked in a thickness direction and a magnet insertion hole extending in an axial direction; and a magnet inserted into the magnet insertion hole, The above rotor is characterized in that The plurality of core plates include: a first core plate; and a second core plate which is stacked adjacent to the first core plate in the magnet insertion direction of the magnet and has an insertion portion constituting a portion of the magnet insertion hole. The first core plate has a protrusion which constitutes a part of the inner surface of the magnet insertion hole and protrudes inwardly of the insertion portion to contact the magnet when the rotor is viewed from the axial direction. The rotor has: a housing portion located in the first core plate or the second core plate in a direction opposite to a protruding direction of the protruding portion when the rotor is viewed from the axial direction; and A restricting member is housed in the housing portion at a position in the opposite direction relative to the protruding portion and restricts displacement of the protruding portion in the opposite direction.

2. The rotor according to claim 1, characterized in that The plurality of core plates include a plurality of first core plates. The plurality of first core plates respectively have the above-mentioned storage portion, The receiving portion is a through hole located in the opposite direction to the protruding portion of the first core plate and penetrating the plurality of first core plates in the thickness direction. The limiting component is located in the through hole.

3. The rotor according to claim 1, characterized in that When the rotor core is viewed from the axial direction, the second core plate has the housing portion at a position overlapping the protruding portion of the first core plate.

4. The rotor according to claim 2, characterized in that The through hole opens at the axial end surface of the rotor core.

5. The rotor according to any one of claims 1 to 3, characterized in that The restricting member includes a rod inserted into the housing portion.

6. The rotor according to claim 2 or 3, characterized in that: The restriction member is a resin filled in the housing portion.

7. The rotor according to claim 2, characterized in that A third core plate is stacked adjacent to the first core plate at an axial end of the rotor core and has a covering portion covering at least a portion of the through hole in the axial direction. The restriction member is a covering portion that protrudes toward the inside of the through hole at least at a position overlapping the through hole when the first core plate is viewed in the axial direction.

8. A motor, characterized in that: have: The rotor according to any one of claims 1 to 3; and The stator comprises a stator coil and a stator core.

9. A method for manufacturing a rotor, the rotor comprising: a cylindrical rotor core having a plurality of core plates stacked in a thickness direction and a magnet insertion hole extending in an axial direction; and A magnet is inserted into the magnet insertion hole. The above-mentioned method for manufacturing a rotor is characterized by comprising: A core plate forming step, forming a first core plate and a second core plate, the second core plate being adjacently stacked relative to the first core plate in a magnet insertion direction of the magnet and having an insertion portion constituting a portion of the magnet insertion hole, and a protrusion is formed on the first core plate, and a displacement allowing portion is formed on the first core plate or the second core plate, the protrusion constituting a portion of an inner surface of the magnet insertion hole and protruding in a direction inward of the insertion portion and contacting the magnet when the rotor core is observed from an axial direction, the displacement allowing portion being located in an opposite direction to the protruding direction of the protrusion relative to the protruding portion and allowing displacement of the protrusion in the opposite direction; a core plate laminating step of laminating the plurality of core plates including the first core plate and the second core plate in a thickness direction, thereby obtaining the columnar rotor core having the magnet insertion hole extending in the axial direction; A magnet inserting step of inserting the magnet into the magnet insertion hole of the rotor core; a limiting member accommodating step of accommodating a limiting member for limiting displacement of the protruding portion in the reverse direction in the first core plate or the second core plate after the magnet inserting step; and The magnetizing step is to magnetize the magnet inserted into the magnet insertion hole after the restriction member accommodating step.

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