Rotor and motor

Abstract

The invention provides a rotor and a motor, which can restrain reduction of effective magnetic flux caused by leakage magnetic flux passing through a protruding part from a magnet in a rotor iron core provided with an opening part. The rotor (30) includes: a rotor core (31) including a plurality of magnetic pole portions (34) extending radially outward in a radial direction from an annular portion (33); and a plurality of magnets (32) each disposed in a slit portion (50) formed between the magnetic pole portions (34) adjacent to each other in the circumferential direction. The magnetic pole portion (34) includes a protruding portion (341) that protrudes from a radially outer end portion toward both sides in a circumferential direction and forms an opening portion (310) on a radially outer side of the slit portion (50). The protruding part (341) is provided with a linear plane part (347) on the outer peripheral surface of the radial outer side.

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 portions arranged circumferentially. Magnets are arranged between adjacent magnetic pole portions. Circumferentially protruding portions are provided at both ends of the radially outer circumferential direction of the magnetic pole portions. The radially outer circumferential surface of the protrusions is arc-shaped. Openings are formed between the protrusions of adjacent magnetic pole portions. The radially outer end face of the magnet protrudes from the openings.

[0003] [Existing Technical Documents]

[0004] [Patent Literature]

[0005] [Patent Document 1] International Publication No. 2008 / 078584 Summary of the Invention

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

[0007] In the rotor of Patent Document 1, because the radial outer circumferential surface of the protrusion is arc-shaped, the leakage magnetic flux from the magnet through the protrusion increases, and the effective magnetic flux tends to decrease. Therefore, there is a problem of reduced output of the motor using the rotor.

[0008] In view of the above problems, the objective of the present invention is to provide a rotor capable of suppressing the reduction of effective magnetic flux caused by leakage magnetic flux from the magnet through the protrusion in a rotor core with an opening, and a motor using said rotor.

[0009] [Technical means to solve the problem]

[0010] To solve the aforementioned problem, the rotor of the present invention is characterized by comprising:

[0011] A rotor core, the rotor core including an annular portion and a plurality of magnetic pole portions extending radially outward from the annular portion; and

[0012] Multiple magnets are respectively disposed in the slits formed between adjacent magnetic pole portions in the circumferential direction.

[0013] The magnetic pole portion includes a protrusion that extends from a radially outer end toward both circumferential sides, forming an opening on the radially outer side of the slit portion.

[0014] 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.

[0015] The motor of the present invention is characterized by comprising: the rotor described herein, a shaft fixed to the rotor, and a stator, the stator comprising a plurality of salient poles formed by coils wound at equal angular intervals on the outer periphery of the rotor. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the motor of this type along the direction of rotation.

[0017] Figure 2 Is with Figure 1 A cross-sectional view of the motor's rotation axis in an orthogonal direction.

[0018] Figure 3 This is a perspective view of the rotor of Embodiment 1.

[0019] Figure 4 This is a plan view of the rotor according to Embodiment 1.

[0020] Figure 5 yes Figure 4 An enlarged view of region A.

[0021] Figure 6 yes Figure 5 An enlarged view of region B.

[0022] Figure 7 This diagram illustrates the shape of the rotor of this form and the rotor of the comparative example.

[0023] Figure 8 It means including Figure 7 The diagram shows the characteristics of the cogging torque of the rotor motors of Examples (CASE) 1 to Examples (CASE) 4.

[0024] Figure 9 This is a perspective view of the rotor in Embodiment 2.

[0025] Figure 10 This is a diagram illustrating the rotor of a modified example.

[0026] Explanation of icon numbers

[0027] 100: Motor

[0028] 11: Shaft (Output Shaft)

[0029] 12: Shell

[0030] 13: Cylinder section

[0031] 14: First bearing housing

[0032] 15: Second bearing housing

[0033] 16: First Bearing

[0034] 17: Second bearing

[0035] 20: Stator

[0036] 21: Stator core

[0037] 22: Insulating components

[0038] 23: Coil

[0039] 24: Salient pole

[0040] 30, 30A, 30B: Rotors

[0041] 31, 31A: Rotor core

[0042] 32, 32A, 32B: Magnets

[0043] 33: Circular portion

[0044] 34: Magnetic pole section

[0045] 36: Support section

[0046] 37: Connecting Part

[0047] 40: Adhesive

[0048] 50: Slit section

[0049] 51: First gap

[0050] 52: Second gap

[0051] 310: Opening

[0052] 321: First end face

[0053] 322: Second end face

[0054] 323: Corner

[0055] 324: Side View

[0056] 325: Chamfered section

[0057] 341: Protrusion

[0058] 342: Corner

[0059] 343: Chamfered section

[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: Inclined surface

[0069] 354: Inclined surface

[0070] 355: Innermost circumference

[0071] 356: Outermost circumference

[0072] 361: concave part

[0073] A, B: Areas

[0074] L: Rotation axis

[0075] L1: Output side

[0076] L2: Opposite output side

[0077] P: Axis Detailed Implementation

[0078] Hereinafter, embodiments of the rotor and motor to which the present invention is applied will be described with reference to the accompanying drawings.

[0079] (Implementation Method 1)

[0080] Figure 1 This is a cross-sectional view of the motor 100 of this type along the direction of the rotation axis L. Figure 2 Is with Figure 1 A cross-sectional view of the rotating shaft L of motor 100 in an orthogonal direction. Figure 3 This is a perspective view of the rotor 30 in Embodiment 1. Figure 4 This is a plan 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 "opposite output side L2".

[0081] (Overall structure)

[0082] 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 opening along the axis of rotation L of the motor 100; a first bearing housing 14 fixed to the output side L1 end of the cylindrical portion 13; and a second bearing housing 15 fixed to the opposite output side L2 end of the cylindrical portion 13. An outer ring of a first bearing 16 containing ball bearings is held on the inner circumference of the first bearing housing 14. Additionally, an outer ring of a second bearing 17 containing ball bearings is held on the inner circumference of the second bearing housing 15. Furthermore, an encoder (not shown) is disposed on the opposite output side L2 of the second bearing housing 15. The encoder detects the rotational speed or angular position of the rotor 30.

[0083] like Figure 1 and Figure 2 As shown, the stator 20 includes: a stator core 21, which includes a plurality of salient poles 24 protruding radially inward at equal angular intervals and in a ring shape; and a coil 23, which is wound around each of the salient poles 24 of the stator core 21 via an insulating member 22 and fixed to the inside of the cylindrical portion 13. The coil 23 is connected to a wiring board (not shown) disposed at the end of the stator core 21. A power supply line is connected to the wiring board. Power is supplied to the coil 23 via the power supply line and the wiring board. Three-phase currents, namely the U phase, V phase, and W phase, are supplied to the coil 23 wound on the salient poles 24.

[0084] like Figure 2 As shown, the rotor 30 is rotatably disposed inside the stator 20. 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 for fixing the rotor core 31 and the magnet 32.

[0085] (Rotor core)

[0086] 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 4 As shown, the rotor core 31 includes: an annular portion 33 for fixing the shaft 11 to its inner circumference; a plurality of magnetic pole portions 34 extending radially outward from the annular portion 33; and a support portion 36 for supporting the inner circumference 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.

[0087] like Figure 5 and Figure 6As shown, the magnetic pole portion 34 includes: a protrusion 341 that protrudes from the radially outer end toward both sides in the circumferential direction to form an opening 310 on the radially outer side of the slit portion 50; and a side portion 344 that faces the magnet 32 ​​in the circumferential direction. The protrusion 341 has a straight planar portion 347 formed on its radially outer outer peripheral surface.

[0088] 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 circumferentially recessed from the protrusion 341 at a position radially overlapping with the radially outward end portion of the magnet 32.

[0089] like Figure 6 As shown, 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, when viewed radially. In this configuration, the first end portion 349 is located at the circumferential center of the magnetic pole portion 34, which is opposite to the recess 345, when viewed radially.

[0090] like Figure 5 As shown, the support portion 36 protrudes from the annular portion 33 toward the slit portion 50 and supports 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, while a portion of the surface 362 of the support portion 36 is not in contact 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.

[0091] 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.

[0092] 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. The inclination direction of the inclined surfaces 353 and 354 is such that they incline 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 inclined surfaces 353 and 354.

[0093] (Adhesive)

[0094] 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 embodiment, adhesive 40 is applied to the entire second gap 52. The second gap 52 functions as an adhesive accumulation portion 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 ​​can also be fixed using the adhesive applied to the side surface 324 of the magnet 32.

[0095] 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.

[0096] (Magnetic flux characteristics of the rotor)

[0097] Next, the magnetic flux characteristics of rotor 30 will be explained. Figure 7 This diagram illustrates the shape of the rotor of this form and the rotor of the comparative example. Figure 8 It means including Figure 7 The graph shows the characteristics of the cogging torque of the rotor motors in Examples 1 to 4. Figure 7 In Embodiment 1, the rotor 30 has the same shape as the rotor of this form. In Embodiment 2, the rotor 30 has the same shape as the rotor of this form except that the recess 345 is not included. In Embodiment 3, the rotor 30 has the same shape as the rotor of this form except that the protrusion 341 is not included. In Embodiment 4, the rotor 30 has the same shape as the rotor of this form 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 ​​of Examples 2 to 4 to the effective magnetic flux and cogging torque values ​​of Example 1. That is, for example, if the effective magnetic flux value of Example 1 is 100 × 10⁻⁶... -6 [Wb], then the effective magnetic flux value of Example 2 is 100.3 × 10 -6 [Wb] If the cogging torque value of Example 1 is 100 [mN·m], then the cogging torque value of Example 2 is 118.0 [mN·m].

[0098] like Figure 8 As shown, the rotor 30 of this embodiment, as Example 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.

[0099] (Effects)

[0100] According to this rotor configuration, since the protrusion 341 has a straight planar portion 347 formed on its radially outer peripheral surface, the reduction in effective magnetic flux caused by leakage magnetic flux from the magnet 32 ​​through the protrusion 341 can be suppressed. As a result, the output reduction of the motor 100 can be suppressed.

[0101] 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 when viewed radially. This further suppresses the reduction in effective magnetic flux caused by leakage magnetic flux from the magnet 32 ​​through the protrusion 341.

[0102] The rotor 30 includes an adhesive 40 applied from the opening 310 to secure the magnetic pole portion 34 and the magnet 32. The magnetic pole portion 34 includes a side portion 344 facing the magnet 32 ​​in the circumferential direction. A protrusion 341 is located radially outward from a first end face 321 of the magnet 32. The side portion 344 includes a recess 345 that is circumferentially recessed from a position radially overlapping the radially outward end portion of the magnet 32. The 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 improving the bonding strength between the rotor core 31 and the magnet 32. In addition, the recess 345 is provided radially outward from the position where it overlaps radially with the radially outer end portion of the magnet 32, so the second gap 52 functions as an adhesive accumulation portion and also as a flux barrier.

[0103] The protrusion 341 includes a chamfered portion 343 at the radially inner corner 342 of the front end portion. As a result, the front end portion of the protrusion 341 is enlarged between itself and the first end face 321, so that when adhesive 40 is applied from the opening 310, adhesive 40 can easily flow into the first gap 51.

[0104] The corners 323 on both radially outer sides of the magnet 32 ​​include chamfered portions 325. When the adhesive 40 is applied from the opening 310, the adhesive 40 can easily flow from the first gap 51 into the second gap 52.

[0105] The rotor core 31 includes a support portion 36 that protrudes from the annular portion 33 toward the slit portion 50 and supports 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. 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.

[0106] 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, which is adjacent to the magnet 32A on one side of the circumferential direction among the two magnets 32 disposed on the circumferential sides of the hole 350; and a second parallel surface 352, parallel to the circumferential side surface of the magnet 32B, which is adjacent to the magnet 32B on the other side of the circumferential direction. 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. Thus, 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.

[0107] The hole 350 is hexagonal in shape. The hole 350 includes inclined surfaces 353 and 354, which are inclined relative to the circumferential end face of the magnet 32 ​​adjacent to the hole 350. 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 outward. As a result, the effective magnetic flux is increased.

[0108] (Implementation Method 2)

[0109] Figure 9 This is a perspective view of the rotor of Embodiment 2. The rotor 30A of Embodiment 2 is identical in structure to the rotor 30 of Embodiment 1, except for the structural differences in the rotor core 31A. Therefore, in Embodiment 2, the same symbols are sometimes used to denote structures identical to those in Embodiment 1, and descriptions are omitted.

[0110] The rotor core 31A includes a connecting portion 37, which circumferentially connects adjacent magnetic pole portions 34 in the radially outer direction. 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 in the radially outer direction of the slit portion 50 where the magnet 32 ​​is disposed, the reduction in strength of the rotor core 31A can be suppressed.

[0111] (Example of rotor core deformation)

[0112] Figure 10This 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. 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 ​​when viewed radially. In this configuration, 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 when viewed radially.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] In the rotor of the described form, the adhesive 40, when viewed from the radially outer side, 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, the adhesive 40, when viewed from the radially outer side, may be applied to cover the entire opening 310. In this case, as the adhesive 40 accumulates radially outward from the opening 310, the adhesive 40 is located inside an imaginary circle passing through the outermost diameter of the rotor. This prevents the adhesive 40 from contacting the stator 20 during rotor rotation.

[0117] In the rotor of Embodiment 1, the side portion 344 includes a recess 345, but in the rotor of the modified example, such as Figure 7 As shown in Embodiment 2, the recess 345 may not be included. Even in the case described above, such as Figure 8 As shown, the rotor 30, as a modified example of Embodiment 2, also effectively suppresses cogging torque while suppressing the reduction of effective magnetic flux.

[0118] In the rotor of the described form, adhesive 40 is applied from the opening 310 between the rotor core 31 and the magnet 32. However, since adhesive is applied between the side surface 324 of the magnet 32 ​​and the side surface 344 of the pole portion 34, adhesive 40 may not be applied in the modified rotor. Even in this case, the reduction in effective magnetic flux caused by leakage magnetic flux from the magnet 32 ​​through the protrusion 341 can be suppressed. As a result, the output reduction of the motor 100 can be suppressed.

[0119] Furthermore, this technology can adopt the following structure. (1)

[0121] A rotor, characterized in that it comprises:

[0122] A rotor core, the rotor core including an annular portion and a plurality of magnetic pole portions extending radially outward from the annular portion; and

[0123] Multiple magnets are respectively disposed in the slits formed between adjacent magnetic pole portions in the circumferential direction.

[0124] The magnetic pole portion includes a protrusion that extends from a radially outer end toward both circumferential sides, forming an opening on the radially outer side of the slit portion.

[0125] 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. (2)

[0127] According to the rotor described in (1), 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 at the circumferential central side of the magnetic pole portion when viewed radially. (3)

[0129] According to the rotor described in (1) or (2), the protrusion is located further radially outward than the first end face of the magnet facing radially outward. (4)

[0131] The rotor according to (3) is characterized in that it further includes an adhesive, which is applied from the opening to fix the magnetic pole portion and the magnet.

[0132] The magnetic pole portion includes a side portion facing the magnet in the circumferential direction.

[0133] The protrusion is located further radially outward than the first end face of the magnet facing radially outward.

[0134] The side portion includes a recess that is circumferentially recessed from a position that radially overlaps with the radially outer end portion of the magnet toward the radially outer side.

[0135] 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. (5)

[0137] The rotor according to any one of (1) to (4) is characterized in that the corner of the protrusion on the radially inner side of the front end portion includes a chamfered portion. (6)

[0139] The rotor according to any one of (1) to (5) is characterized in that the corners of the magnet on both sides of the radial outer side include chamfered portions. (7)

[0141] The rotor according to any one of (1) to (6) is 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.

[0142] 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. (8)

[0144] The rotor according to any one of (1) to (7) is characterized in that the rotor core includes a connecting portion that connects the adjacent magnetic pole portion circumferentially outside the magnetic pole portion. (9)

[0146] The rotor according to any one of (1) to (8) is characterized in that a hole is formed at the radially inner end of the magnetic pole portion.

[0147] The aperture includes: a first parallel surface parallel to the circumferential side surface of the magnet adjacent to the magnet on one side of the circumferential direction of the two magnets disposed on opposite sides of the aperture; and a second parallel surface parallel to the circumferential side surface of the magnet adjacent to the magnet on the other side of the circumferential direction.

[0148] 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. (10)

[0150] According to the rotor described in (9), the hole is characterized in that it is hexagonal in shape.

[0151] 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.

[0152] The inclined surface is inclined radially outward toward the circumferential center of the magnetic pole portion on which the hole is provided. (11)

[0154] A motor, comprising:

[0155] The rotor according to any one of (1) to (10);

[0156] A shaft, fixed to the rotor; and

[0157] The stator includes a plurality of salient poles formed by coils wound 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; as well as Multiple magnets are respectively disposed in the slits formed between adjacent magnetic pole portions in the circumferential direction. The magnetic pole portion includes a protrusion that extends from a radially outer end toward both circumferential sides, forming an opening on the radially outer side of the slit portion. 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.

2. The rotor according to claim 1, characterized in that, 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 when viewed radially.

3. The rotor according to claim 1, characterized in that, The protrusion is located further radially outward than the first end face of the magnet facing radially outward.

4. The rotor according to claim 3, characterized in that, It also includes an adhesive, which is applied from the opening to fix the magnetic pole portion and the magnet. The magnetic pole portion includes a side portion facing 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 circumferentially recessed from a position that radially overlaps with the radially outer end portion of the magnet toward the radially outer side. 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.

5. The rotor according to any one of claims 1 to 4, characterized in that, The protrusion includes a chamfered portion at the radially inner corner of the front end portion.

6. The rotor according to any one of claims 1 to 4, characterized in that, The magnet has chamfered corners on both sides of its radially outer side.

7. 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.

8. The rotor according to claim 1, characterized in that, The rotor core includes a connecting portion that connects the adjacent magnetic pole portion circumferentially outside the magnetic pole portion.

9. 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 surface parallel to the circumferential side surface of the magnet adjacent to the magnet on one side of the circumferential direction of the two magnets disposed on opposite sides of the aperture; and a second parallel surface parallel to the circumferential side surface of the magnet adjacent to the magnet on the other side of 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.

10. The rotor according to claim 9, 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 is inclined radially outward toward the circumferential center of the magnetic pole portion on which the hole is provided.

11. 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 salient poles formed by coils wound at equal angular intervals on the outer periphery of the rotor.

Images