Rotor and motor

Abstract

The invention provides a rotor and a motor capable of ensuring the amount of an adhesive applied from an opening part and improving the bonding strength between a rotor core and a magnet. The rotor includes: a rotor core including a plurality of magnetic pole portions radially extending radially outward from an annular portion; a plurality of magnets each disposed in a slit portion formed between the magnetic pole portions adjacent to each other in the circumferential direction; and an adhesive applied from an opening formed on the radially outer side of the slit portion to fix the magnetic pole portion and the magnet. The magnetic pole portion includes: a protruding portion protruding from a radially outer end portion toward both sides in a circumferential direction to form an opening portion; and a side surface portion facing the magnet in the circumferential direction. The side surface portion includes a recessed portion that is recessed in the circumferential direction toward the radially outer side from a position that overlaps the radially outer end portion of the magnet in the radial direction. The adhesive is applied from a first gap formed between the protruding portion and the first end face in the radial direction to at least a part of a second gap formed between the recessed portion and the magnet in the circumferential direction.

Description

Technical Field

[0001] This invention relates to a rotor and a motor. Background Technology

[0002] A rotor with embedded magnets is described in Patent Document 1. The rotor of Patent Document 1 includes a rotor core and magnets embedded in the rotor core. The rotor core includes a plurality of magnetic pole pieces arranged circumferentially. Magnets are disposed between adjacent magnetic pole pieces. Protrusions protruding circumferentially are provided at both ends of the magnetic pole pieces on their radially outer sides. Openings are formed between the protrusions of adjacent magnetic pole pieces. The radially outer end face of the magnet protrudes from the openings. The protrusions are located radially outer than the radially outer end face of the magnet.

[0003] [Existing Technical Documents]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2020-124112 Summary of the Invention

[0006] [The problem the invention aims to solve]

[0007] In the rotor of Patent Document 1, an adhesive is sometimes applied between the protrusion and the magnet through the opening to fix the magnetic pole piece and the magnet. However, in this case, the amount of adhesive applied between the protrusion and the magnet is insufficient, resulting in a weak bond strength between the magnetic pole piece and the magnet.

[0008] In view of the above problems, the objective of the present invention is to provide a rotor that can ensure the amount of adhesive applied from the opening to improve the bonding strength between the rotor core and the magnet, and a motor using said rotor.

[0009] [Technical means to solve the problem]

[0010] To address the aforementioned issues, the rotor of the present invention includes: a rotor core comprising an annular portion and a plurality of magnetic pole portions extending radially outward from the annular portion;

[0011] Multiple magnets are respectively disposed in slits formed between adjacent magnetic pole portions in the circumferential direction; and

[0012] An adhesive is applied from the opening formed radially outward of the slit portion to secure the magnetic pole portion and the magnet.

[0013] The magnetic pole portion includes: a protrusion that protrudes from a radially outer end toward both circumferential sides to form the opening; and a side portion that faces the magnet in the circumferential direction.

[0014] The protrusion is located further radially outward than the first end face of the magnet facing radially outward.

[0015] The side portion includes a recess that is recessed circumferentially from a position where it overlaps radially with the radially outer end portion of the magnet.

[0016] The adhesive is applied from a first gap formed radially between the protrusion and the first end face to at least a portion of a second gap formed circumferentially between the recess and the magnet.

[0017] The motor of the present invention includes: a rotor as described above; a shaft fixed to the rotor; and a stator including a plurality of coiled protrusions arranged at equal angular intervals on the outer periphery of the rotor. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view along the direction of the rotation axis of the motor in this configuration.

[0019] Figure 2 Is with Figure 1 A cross-section in a direction orthogonal to the rotation axis of the motor.

[0020] Figure 3 This is a perspective view of the rotor of Embodiment 1.

[0021] Figure 4 This is a top view of the rotor in Embodiment 1.

[0022] Figure 5 yes Figure 4 An enlarged view of region A.

[0023] Figure 6 yes Figure 5 An enlarged view of region B.

[0024] Figure 7 This is a diagram illustrating the shape of the rotor in this embodiment and the rotor in the comparative example.

[0025] Figure 8 It means including Figure 7 The diagram shows the characteristics of the cogging torque of the rotor motor in cases 1 to 4.

[0026] Figure 9 This is a perspective view of the rotor in Embodiment 2.

[0027] Figure 10 This is a diagram illustrating the rotor of a modified example.

[0028] Explanation of icon numbers

[0029] 11: Shaft (Output Shaft)

[0030] 12: Shell

[0031] 13: Cylinder section

[0032] 14: First bearing retainer

[0033] 15: Second bearing retainer

[0034] 16: First Bearing

[0035] 17: Second bearing

[0036] 20: Stator

[0037] 21: Stator core

[0038] 22: Insulating components

[0039] 23: Coil

[0040] 24: Sudden pole

[0041] 30, 30A, 30B: Rotors

[0042] 31, 31A: Rotor core

[0043] 32, 32A, 32B: Magnets

[0044] 33: Circular portion

[0045] 34: Magnetic pole section

[0046] 36: Support section

[0047] 37: Connecting Part

[0048] 40: Adhesive

[0049] 50: Slit section

[0050] 51: First gap

[0051] 52: Second gap

[0052] 100: Motor

[0053] 310: Opening

[0054] 321: First end face

[0055] 322: Second end face

[0056] 323, 342: Corner

[0057] 324: Side View

[0058] 325, 343: Chamfered section

[0059] 341: Protrusion

[0060] 344: Side profile

[0061] 345: concave part

[0062] 347: Planar part

[0063] 348: concave face

[0064] 349: First end

[0065] 350: Hole

[0066] 351: First parallel plane

[0067] 352: Second parallel plane

[0068] 353, 354: Inclined surfaces

[0069] 355: Innermost circumference

[0070] 356: Outermost circumference

[0071] 361: concave part

[0072] A, B: Areas

[0073] L: Rotation axis

[0074] L1: Output side

[0075] L2: Reverse output side

[0076] P: Axis Detailed Implementation

[0077] Hereinafter, embodiments of the rotor and motor to which the present invention is applied will be described with reference to the accompanying drawings.

[0078] (Implementation Method 1)

[0079] Figure 1 This is a cross-sectional view along the direction of the rotation axis L of the motor 100 in this configuration. Figure 2 Is with Figure 1 A cross-section of the rotating shaft L of motor 100 in a direction orthogonal to it. Figure 3 This is a perspective view of the rotor 30 in Embodiment 1. Figure 4 This is a top view of the rotor 30 according to Embodiment 1. Figure 5 yes Figure 4 An enlarged view of region A. Figure 6 yes Figure 5 An enlarged view of section B. In this specification, one side along the axis of rotation L is designated as "output side L1 (the side protruding from shaft 11)", and the other side opposite to output side L1 is designated as "reverse output side L2".

[0080] (Overall structure)

[0081] Figure 1 The motor 100 shown is a magnet-embedded type motor in which magnets are embedded in the rotor core. For example... Figure 1 As shown, the motor 100 includes: a housing 12, a cylindrical stator 20 disposed inside the housing 12, a rotor 30 rotatably disposed inside the stator 20, and a shaft (output shaft) 11 fixed to the rotor 30. The housing 12 includes: a cylindrical portion 13 with an opening facing the axis of rotation L of the motor 100; a first bearing retainer 14 fixed to the output side L1 end of the cylindrical portion 13; and a second bearing retainer 15 fixed to the reverse output side L2 end of the cylindrical portion 13. An outer ring of a first bearing 16, made of ball bearings, is held on the inner circumference of the first bearing retainer 14. Additionally, an outer ring of a second bearing 17, also made of ball bearings, is held on the inner circumference of the second bearing retainer 15. Furthermore, an encoder (not shown) is disposed on the reverse output side L2 of the second bearing retainer 15. The encoder detects the rotational speed or angular position of the rotor 30.

[0082] like Figure 1 and Figure 2 As shown, the stator 20 includes an annular stator core 21 with a plurality of radially inwardly projecting poles 24 spaced at equal angles, and coils 23 wound around each pole 24 of the stator core 21 via insulating members 22, and fixed inside the cylindrical portion 13. The coils 23 are connected to a wiring board (not shown) disposed at the end of the stator core 21. Power supply lines are connected to the wiring board. Power is supplied to the coils 23 via the power supply lines and the wiring board. Three-phase currents (U-phase, V-phase, and W-phase) are supplied to the coils 23 wound around the poles 24.

[0083] like Figure 2 As shown, the rotor 30 is arranged inside the stator 20 in a rotatable state. The rotor 30 includes a rotor core 31 to which the shaft 11 of the motor 100 is fixed, a magnet 32 ​​embedded in the rotor core 31, and an adhesive 40 to fix the rotor core 31 and the magnet 32.

[0084] (Rotor core)

[0085] The rotor core 31 is a laminated body composed of multiple sheets of magnetic materials such as silicon steel plates (magnetic plates). For example... Figure 3 and Figure 4As shown, the rotor core 31 includes an annular portion 33 that fixes the shaft 11 to its inner circumferential side, a plurality of magnetic pole portions 34 extending radially outward from the annular portion 33, and a support portion 36 that supports the inner circumferential side of the magnet 32. The magnetic pole portions 34 are arranged at equal angular intervals. A slit portion 50 is formed between adjacent magnetic pole portions 34 in the circumferential direction. The magnet 32 ​​is inserted into and embedded in the slit portion 50 from the axial direction. Furthermore, when the magnet 32 ​​is inserted into the slit portion 50, an adhesive is applied to the side surface of the magnet 32.

[0086] like Figure 5 and Figure 6 As shown, the magnetic pole portion 34 includes: a protrusion 341 that protrudes from the radially outer end to both sides in the circumferential direction and forms an opening 310 on the radially outer side of the slit portion 50, and a side portion 344 facing the magnet 32 ​​in the circumferential direction. The protrusion 341 has a straight planar portion 347 formed on its radially outer outer peripheral surface.

[0087] like Figure 6 As shown, the planar portion 347 is a plane orthogonal to the axis P extending circumferentially from the center. Additionally, the inner circumferential surface of the radially inner side of the protrusion 341 is a plane orthogonal to the axis P extending circumferentially from the center. Therefore, the radial thickness of the protrusion 341 is approximately constant circumferentially. The protrusion 341 is located radially outward from the first radially outward end face 321 of the magnet 32. The side portion 344 includes a recess 345, which is recessed circumferentially from the protrusion 341 at a position radially overlapping with the radially outward end portion of the magnet 32.

[0088] like Figure 6 As shown, when viewed radially, the first end portion 349 of the planar portion 347, which is opposite to one side of the front end portion of the protrusion 341, is located at the circumferential center of the magnetic pole portion 34, which is opposite to the magnet 32. In this configuration, when viewed radially, the first end portion 349 is located at the circumferential center of the magnetic pole portion 34 with respect to the recess 345.

[0089] like Figure 5 As shown, the support portion 36 protrudes from the annular portion 33 toward the slit portion 50 to support the second end face 322 of the magnet 32 ​​facing radially inward. The support portion 36 is in contact with the circumferential central portion of the second end face 322, but not with the circumferential side portions of the second end face 322. That is, a recess 361 is formed between the support portion 36 and the side portion 344.

[0090] like Figure 5As shown, a hole 350 is formed at the radially inner end of the magnetic pole portion 34. The hole 350 is hexagonal in shape. Magnets 32 are arranged on both sides of the hole 350 in the circumferential direction. One side of the inner circumferential surface of the hole 350 becomes a first parallel surface 351 parallel to the circumferential side surface 324 of the magnet 32A adjacent on one side in the circumferential direction. The other side of the inner circumferential surface of the hole 350 becomes a second parallel surface 352 parallel to the circumferential side surface 324 of the magnet 32B adjacent on the other side in the circumferential direction. At least a portion of the first parallel surface 351 is located radially outer than the inner circumferential side surface 324 of the magnet 32A. Similarly, at least a portion of the second parallel surface 352 is located radially outer than the inner circumferential side surface 324 of the magnet 32B. Thus, the portion between the hole 350 and the magnets 32A and 32B becomes a thin wall of a certain thickness, thereby suppressing leakage magnetic flux through the inner circumferential end of the magnetic pole portion 34.

[0091] The inner circumferential surface of the hole 350 includes: an innermost circumferential surface 355 connecting the inner circumferential ends of the first parallel surface 351 and the second parallel surface 352; an outermost circumferential surface 356 facing the innermost circumferential surface 355; an inclined surface 353 located between the outermost circumferential surface 356 and the first parallel surface 351; and an inclined surface 354 located between the outermost circumferential surface 356 and the second parallel surface 352. The inclined surfaces 353 and 354 are inclined relative to the circumferential side surfaces 324 of the magnets 32A and 32B adjacent to the hole 350 in the circumferential direction. The inclination direction of the inclined surfaces 353 and 354 is towards the circumferential center of the magnetic pole portion 34 on which the hole 350 is provided. Thus, the magnetic flux through the magnetic pole portion 34 is guided along the direction of the inclined surfaces 353 and 354.

[0092] (Adhesive)

[0093] like Figure 5 and Figure 6 As shown, adhesive 40 is applied from the opening 310 to fix the magnetic pole portion 34 and the magnet 32. When adhesive 40 is applied from the opening 310, it flows from the first gap 51 formed radially between the protrusion 341 and the first end face 321 into at least a portion of the second gap 52 formed circumferentially between the recess 345 and the magnet 32. That is, adhesive 40 is applied from the first gap 51 to at least a portion of the second gap 52. In this configuration, adhesive 40 is applied to the entire second gap 52. The second gap 52 functions as an adhesive accumulation area and also as a flux barrier. Furthermore, although not shown, when the magnet 32 ​​is inserted into the slit portion 50, the magnetic pole portion 34 and the magnet 32 ​​are fixed even by the adhesive applied to the side surface 324 of the magnet 32.

[0094] Here, as Figure 6 As shown, the protrusion 341 includes a chamfered portion 343 at its radially inner corner 342 on the front end portion. The magnet 32 ​​includes chamfered portions 325 at its radially outer corners 323 on both sides. The chamfered portions 343 and 325 are either C-shaped or R-shaped. Therefore, the adhesive 40 applied from the opening 310 can easily flow from the first gap 51 into the second gap 52.

[0095] (Magnetic flux characteristics of the rotor)

[0096] Next, the magnetic flux characteristics of rotor 30 will be explained. Figure 7 This is a diagram illustrating the shape of the rotor in this embodiment and the rotor in the comparative example. Figure 8 It means including Figure 7 The diagram shows the cogging torque characteristics of the rotor motor for cases 1 through 4. Figure 7 In case 1, the shape is the same as that of the rotor 30 of this embodiment. In case 2, the shape is the same as that of the rotor 30 of this embodiment except that the recess 345 is not included. In case 3, the shape is the same as that of the rotor 30 of this embodiment except that the protrusion 341 is not included. In case 4, the shape is the same as that of the rotor 30 of this embodiment except that both the protrusion 341 and the recess 345 are not included. Furthermore, in Figure 7 The adhesive has been omitted. Figure 8 In this context, the ratio is the ratio of the effective magnetic flux and cogging torque values ​​in cases 2 to 4 to the effective magnetic flux and cogging torque values ​​in case 1. That is, for example, if the effective magnetic flux value in case 1 is 100 × 10⁻⁶... -6 [Wb], then the effective magnetic flux value in case 2 is 100.3 × 10 -6 [Wb] If the cogging torque value in case 1 is 100 [mN·m], then the cogging torque value in case 2 is 118.0 [mN·m].

[0097] like Figure 8 As shown, the rotor 30 in this embodiment, as case 1, effectively suppresses cogging torque while suppressing the decrease in effective magnetic flux. Here, it is ideal to further suppress cogging torque in the performance of the motor 100.

[0098] (Effects)

[0099] According to this rotor, adhesive 40 is applied from a first gap 51 formed radially between the protrusion 341 and the first end face 321 to at least a portion of a second gap 52 formed circumferentially between the recess 345 and the magnet 32. This ensures an adequate amount of adhesive 40 applied from the opening 310, thereby increasing the bonding strength between the rotor core 31 and the magnet 32. Furthermore, since the recess 345 is positioned radially outward from its radially overlapping end portion with the radially outer side of the magnet 32, the second gap 52 functions as an adhesive accumulation area and also as a magnetic bridge.

[0100] The protrusion 341 includes a chamfered portion 343 at the radially inner corner 342 of the front end portion. As a result, since the front end portion of the protrusion 341 is enlarged between itself and the first end face 321, the adhesive 40 applied from the opening 310 can easily flow into the first gap 51.

[0101] The corners 323 on both radially outer sides of the magnet 32 ​​include chamfered portions 325. The adhesive 40 applied from the opening 310 can easily flow from the first gap 51 into the second gap 52.

[0102] The rotor core 31 includes a support portion 36 that protrudes from the annular portion 33 toward the slit portion 50 to support the second end face 322 of the magnet 32 ​​facing radially inward. The support portion 36 contacts the central portion of the second end face 322 in the circumferential direction, but not the two circumferential portions of the second end face 322 in the circumferential direction. Therefore, since the contact surface of the support portion 36 does not form an angle with the side surface 344 of the magnetic pole portion 34, when the magnet 32 ​​is inserted into the slit portion 50, the radially inward corner of the magnet 32 ​​can be prevented from getting stuck inside the slit portion 50. As a result, the magnet 32 ​​can be easily inserted into the slit portion 50.

[0103] The protrusion 341 has a straight planar portion 347 formed on its radially outer peripheral surface. This suppresses the reduction in effective magnetic flux caused by leakage magnetic flux from the magnet 32 ​​through the protrusion 341. Consequently, it suppresses the reduction in the output of the motor 100.

[0104] When viewed radially, the first end portion 349 of the planar portion 347, which is opposite to one side of the front end portion of the protrusion 341, is located at the circumferential center of the magnetic pole portion 34 relative to the recess 345. This further suppresses the reduction in effective magnetic flux caused by leakage magnetic flux from the magnet 32 ​​through the protrusion 341.

[0105] A hole 350 is formed at the radially inner end of the magnetic pole portion 34. The hole 350 includes a first parallel surface 351 parallel to the circumferential side surface of the magnet 32A adjacent to one side of the two magnets 32 arranged on the circumferential sides of the hole 350, and a second parallel surface 352 parallel to the circumferential side surface of the magnet 32B adjacent to the other side of the circumferential side. At least a portion of the first parallel surface 351 and the second parallel surface 352 is located radially outer than the second end face 322 of the magnet 32 ​​on the radially inner side. In this way, the leakage magnetic flux from the magnet 32 ​​toward the radially inner side of the magnetic pole portion 34 can be reduced through the hole 350, thereby suppressing the reduction of effective magnetic flux.

[0106] The hole 350 is hexagonal in shape. The hole 350 includes inclined surfaces 353 and 354 that are inclined relative to the circumferential end face of the magnet 32 ​​adjacent to the hole 350 in the circumferential direction. The inclined surfaces 353 and 354 are inclined radially outward towards the circumferential center of the magnetic pole portion 34 where the hole 350 is located. Therefore, since magnetic flux is guided along the inclined surfaces 353 and 354, the magnetic flux is guided both towards the center of the magnetic pole portion 34 and towards the outer periphery. As a result, the effective magnetic flux is increased.

[0107] (Implementation Method 2)

[0108] Figure 9 This is a perspective view of the rotor of Embodiment 2. Except for the structural differences in the rotor core 31A, the rotor 30A of Embodiment 2 has the same structure as the rotor 30 of Embodiment 1. Therefore, in Embodiment 2, the same symbols are sometimes used to denote structures identical to those in Embodiment 1, and descriptions are omitted.

[0109] The rotor core 31A includes a connecting portion 37 that connects adjacent magnetic pole portions 34 circumferentially to the radially outer side of the magnetic pole portion 34. In this embodiment, the connecting portion 37 is provided at both ends in the axial direction of the rotor core 31. However, the connecting portion 37 is not limited to being provided at both ends in the axial direction of the rotor core 31. For example, in addition to being provided at both ends in the axial direction of the rotor core 31, the connecting portion 37 may also be provided at the central portion in the axial direction of the rotor core 31. Alternatively, the connecting portion 37 may be provided only at the central portion in the axial direction of the rotor core 31. According to this embodiment of the rotor 30A, since the rotor core 31A includes the connecting portion 37, even when an opening 310 is formed radially outer side of the slit portion 50 where the magnet 32 ​​is disposed, the reduction in strength of the rotor core 31A can be suppressed.

[0110] (Example of rotor core deformation)

[0111] Figure 10 This is a diagram illustrating the modified rotor 30B. (As shown...) Figure 10 As shown, the protrusion 341 has a concave portion 348 formed on its radially outer peripheral surface, which is recessed radially inward. When viewed radially, the first end portion 349 of the concave portion 348, which is opposite to the front end portion of the protrusion 341, is located at the circumferential center of the magnetic pole portion 34, which is further opposite to the magnet 32. In this embodiment, when viewed radially, the first end portion 349 is located at the circumferential center of the magnetic pole portion 34, which is further than the concave portion 345.

[0112] Furthermore, by recessing the concave portion 348 radially inward, the radial thickness of the protruding portion 341 gradually thins towards the front end. Even in the modified rotor 30B, the same effect as in Embodiment 1 can be achieved.

[0113] In the rotor of Embodiment 1, the planar portion 347 is a plane orthogonal to the axis extending circumferentially from the center. However, in the rotor of the modified embodiment, the planar portion 347 may also be a plane that is radially inward toward the front end portion of the protrusion 341.

[0114] In the rotor of Embodiment 1, the adhesive 40 is applied to the entire second gap 52, but in the rotor of the modified embodiment, the adhesive 40 is only applied to at least a portion of the second gap 52.

[0115] In the rotor described above, when viewed from the radially outer side, the adhesive 40 is applied to a portion of the opening 310 (the edge portion of the front end of the protrusion 341). However, in the modified rotor, when viewed from the radially outer side, the adhesive 40 may be applied to cover the entire opening 310. In this case, with the adhesive 40 bulging radially outward from the opening 310, the adhesive 40 is located inside an imaginary circle passing through the outermost diameter of the rotor. Therefore, when the rotor rotates, contact between the adhesive 40 and the stator 20 can be suppressed.

[0116] Furthermore, this technology can adopt the following structure. (1)

[0118] A rotor, comprising:

[0119] The rotor core includes an annular portion and a plurality of magnetic pole portions extending radially outward from the annular portion;

[0120] Multiple magnets are respectively disposed in slits formed between adjacent magnetic pole portions in the circumferential direction; and

[0121] An adhesive is applied from the opening formed radially outward of the slit portion to secure the magnetic pole portion and the magnet.

[0122] The magnetic pole portion includes: a protrusion that protrudes from a radially outer end toward both circumferential sides to form the opening; and a side portion that faces the magnet in the circumferential direction.

[0123] The protrusion is located further radially outward than the first end face of the magnet facing radially outward.

[0124] The side portion includes a recess that is recessed circumferentially from a position where it overlaps radially with the radially outer end portion of the magnet.

[0125] The adhesive is applied from a first gap formed radially between the protrusion and the first end face to at least a portion of a second gap formed circumferentially between the recess and the magnet. (2)

[0127] According to the rotor described in (1), the protrusion includes a chamfered portion at the radially inner corner of the front end portion. (3)

[0129] According to the rotor described in (1) or (2), the corners of the magnet on both sides of the radial outer side include chamfered portions. (4)

[0131] According to any one of (1) to (3), the rotor core includes a support portion that protrudes from the annular portion toward the slit portion and supports a second end face of the magnet facing radially inward.

[0132] The support portion is connected to the central portion of the second end face in the circumferential direction, but not to the two circumferential portions of the second end face in the circumferential direction. (5)

[0134] According to any one of (1) to (4), the protrusion has a straight planar portion formed on the outer peripheral surface of the radially outer side, or a concave portion formed on the outer peripheral surface of the radially outer side that is recessed towards the radially inner side. (6)

[0136] According to the rotor described in (5), when viewed radially, the first end of the planar portion or the concave portion, which is opposite to one side of the front end portion of the protrusion, is located on the circumferential central side of the magnetic pole portion, which is closer to the magnet than the magnet. (7)

[0138] According to any one of (1) to (6), the rotor core includes a connecting portion of the magnetic pole portion that is circumferentially connected to the adjacent magnetic pole portion on the radially outer side of the magnetic pole portion. (8)

[0140] According to any one of (1) to (7), a hole is formed at the radially inner end of the magnetic pole portion of the rotor.

[0141] The aperture includes a first parallel plane parallel to the circumferential side surface of the magnet adjacent to one side of the two magnets arranged on both sides of the aperture in the circumferential direction, and a second parallel plane parallel to the circumferential side surface of the magnet adjacent to the other side in the circumferential direction.

[0142] At least a portion of the first parallel plane and the second parallel plane are located radially outward from the second end face, which is radially inward from the magnet. (9)

[0144] According to the rotor described in (8), the shape of the hole is hexagonal.

[0145] The aperture includes an inclined surface that is inclined relative to the circumferential end face of the magnet adjacent to the aperture in the circumferential direction.

[0146] The inclined surface tilts radially outward toward the circumferential center of the magnetic pole portion where the hole is located. (10)

[0148] A motor, comprising:

[0149] The rotor according to any one of (1) to (9);

[0150] The shaft is fixed to the rotor; and

[0151] The stator includes a plurality of coiled salient poles arranged at equal angular intervals on the outer periphery of the rotor.

Claims

1. A rotor, characterized in that, include: The rotor core includes an annular portion and a plurality of magnetic pole portions extending radially outward from the annular portion; Multiple magnets are respectively disposed in slits formed between adjacent magnetic pole portions in the circumferential direction; as well as An adhesive is applied from the opening formed radially outward of the slit portion to secure the magnetic pole portion and the magnet. The magnetic pole portion includes: a protrusion that protrudes from the radially outer end to both circumferential sides to form the opening; And the side portion, which faces the magnet in the circumferential direction. The protrusion is located further radially outward than the first end face of the magnet facing radially outward. The side portion includes a recess that is recessed circumferentially from a position where it overlaps radially with the radially outer end portion of the magnet. The adhesive is applied from a first gap formed radially between the protrusion and the first end face to at least a portion of a second gap formed circumferentially between the recess and the magnet.

2. The rotor according to claim 1, characterized in that, The protrusion includes a chamfered portion at the radially inner corner of the front end portion.

3. The rotor according to claim 1 or 2, characterized in that, The magnet has chamfered corners on both sides of its radially outer side.

4. The rotor according to claim 1, characterized in that, The rotor core includes a support portion that protrudes from the annular portion toward the slit portion and supports the second end face of the magnet facing radially inward. The support portion is connected to the central portion of the second end face in the circumferential direction, but not to the two circumferential portions of the second end face in the circumferential direction.

5. The rotor according to claim 1, characterized in that, The protrusion has a straight planar portion on its radially outer peripheral surface, or a concave portion that is recessed radially inward on its radially outer peripheral surface.

6. The rotor according to claim 5, characterized in that, When viewed radially, the first end of the planar portion or the concave portion, which is opposite to one side of the front end portion of the protrusion, is located on the circumferential central side of the magnetic pole portion, which is closer to the magnet than the magnet.

7. The rotor according to claim 1, characterized in that, The rotor core includes a connecting portion of the magnetic poles that is circumferentially connected to each other on the radially outer side of the magnetic poles.

8. The rotor according to claim 1, characterized in that, A hole is formed at the radially inner end of the magnetic pole portion. The aperture includes a first parallel plane parallel to the circumferential side surface of the magnet adjacent to one side of the two magnets arranged on both sides of the aperture in the circumferential direction, and a second parallel plane parallel to the circumferential side surface of the magnet adjacent to the other side in the circumferential direction. At least a portion of the first parallel plane and the second parallel plane are located radially outward from the second end face, which is radially inward from the magnet.

9. The rotor according to claim 8, characterized in that, The hole is hexagonal in shape. The aperture includes an inclined surface that is inclined relative to the circumferential end face of the magnet adjacent to the aperture in the circumferential direction. The inclined surface tilts radially outward toward the circumferential center of the magnetic pole portion where the hole is located.

10. A motor, characterized in that, include: The rotor as described in claim 1; The shaft is fixed to the rotor; as well as The stator includes a plurality of coiled salient poles arranged at equal angular intervals on the outer periphery of the rotor.

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