Rotor and motor

Abstract

The present invention provides a rotor and a motor. The rotor (30) includes: a rotor core (31) comprising a plurality of magnetic pole portions (34) extending radially outward from an annular portion (33); a plurality of magnets (32) respectively disposed in slit portions (50) formed between adjacent magnetic pole portions (34) in the circumferential direction; and an adhesive (40) applied from an opening (310) formed in the radially outward of the slit portion (50) to fix the magnetic pole portions (34) and the magnets (32). The magnetic pole portion (34) includes: a protrusion (341) protruding from a radially outward end portion to both sides in the circumferential direction to form an opening (310); and a side portion (344) facing the magnet (32) in the circumferential direction. The side portion (344) includes a recess (345) which is recessed in the circumferential direction from a position that overlaps radially with the radially outward end portion of the magnet (32). 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).

Description

[Technical Field]

[0001] This invention relates to a rotor and a motor. [Previous 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 outerward than the radially outer end face of the magnet. [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-124112 [Summary of the Invention]

[0004] [Problem to be solved by the invention] In the rotor of Patent Document 1, sometimes an adhesive is applied between the protrusion and the magnet from 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 problem of weak adhesion strength between the magnetic pole piece and the magnet.

[0005] In view of the above problems, the object of the present invention is to provide a rotor that can ensure the amount of adhesive applied from the opening, thereby improving the bonding strength between the rotor core and the magnet, and a motor using said rotor. [Technical Means for Solving the Problem]

[0006] To solve the aforementioned problem, the rotor of the present invention is characterized by comprising: a rotor core including an annular portion and a plurality of magnetic pole portions extending radially outward from the annular portion; a plurality of magnets respectively disposed in slit portions formed between adjacent magnetic pole portions in the circumferential direction; and an adhesive applied from an opening formed in the radially outward direction of the slit portion to fix the magnetic pole portions and the magnets, the magnetic pole portion comprising: a protrusion protruding from an end portion in the radial direction to both sides in the circumferential direction to form the opening portion; and a side portion facing the magnet in the circumferential direction, the protrusion being located further radially outward than a first end face of the magnet facing radially outward, the side portion including a recess recessing in the circumferential direction from a position overlapping radially with the end portion of the radially outward direction of the magnet, the adhesive being 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.

[0007] The motor of the present invention is characterized in that it comprises: a rotor as described above; a shaft fixed to the rotor; and a stator comprising a plurality of coiled protrusions arranged at equal angular intervals on the outer periphery of the rotor.

Implementation Method

[0009] Hereinafter, embodiments of the rotor and motor to which the present invention is applied will be described with reference to the accompanying drawings.

[0010] (Embodiment 1) FIG1 is a cross-sectional view along the direction of the rotation axis L of the motor 100 of this embodiment. FIG2 is a cross-section in a direction orthogonal to the rotation axis L of the motor 100 of FIG1. ​​FIG3 is an external perspective view of the rotor 30 of Embodiment 1. FIG4 is a top view of the rotor 30 of Embodiment 1. FIG5 is an enlarged view of region A of FIG4. FIG6 is an enlarged view of region B of FIG5. In this specification, one side along the axial direction of the rotation axis L is designated as "output side L1 (the side protruding from the shaft 11)", and the other side opposite to the output side L1 is designated as "reverse output side L2".

[0011] (Overall Structure) The motor 100 shown in FIG1 is an embedded magnet type motor in which magnets are embedded in the rotor core. As shown in FIG1, 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 along 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. The outer ring of a first bearing 16, which is made of ball bearings, is held on the inner circumferential side of the first bearing retainer 14. In addition, the outer ring of a second bearing 17, which is made of ball bearings, is held on the inner circumferential side of the second bearing retainer 15. In addition, 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.

[0012] As shown in Figures 1 and 2, 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 on the poles 24.

[0013] As shown in Figure 2, 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.

[0014] (Rotor Core) The rotor core 31 is a laminated body made of multiple sheets of magnetic materials such as silicon steel plates (magnetic plates). As shown in Figures 3 and 4, the rotor core 31 includes an annular portion 33 that fixes the shaft 11 to the inner circumferential side, a plurality of magnetic pole portions 34 that extend 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 in the axial direction. In addition, when the magnet 32 ​​is inserted into the slit portion 50, an adhesive is applied to the side of the magnet 32.

[0015] As shown in Figures 5 and 6, 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.

[0016] As shown in FIG. 6, the planar portion 347 is a plane orthogonal to the axis P extending circumferentially from the center. Furthermore, 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 in the circumferential direction. 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.

[0017] As shown in FIG6, 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 embodiment, 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.

[0018] As shown in FIG. 5, 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.

[0019] As shown in FIG. 5, 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. In addition, 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 side surface 324 of the inner circumferential side of the magnet 32A. In addition, at least a portion of the second parallel surface 352 is located radially outer than the side surface 324 of the inner circumferential side of the magnet 32B. As a result, the portion between the hole 350 and the magnets 32A and 32B becomes a thin wall of a certain thickness, thereby suppressing the leakage magnetic flux through the inner peripheral end of the magnetic pole portion 34.

[0020] 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 a direction inclined toward 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.

[0021] (Adhesive) As shown in Figures 5 and 6, 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 manner, 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 ​​are fixed even by the adhesive applied to the side surface 324 of the magnet 32.

[0022] Here, as shown in FIG6, the corner 342 of the radially inner side of the protrusion 341 includes a chamfered portion 343. The corners 323 of the magnet 32 ​​on both sides of the radially outer side include chamfered portions 325. The chamfered portions 343 and 325 are C-shaped or R-shaped. As a result, the adhesive 40 applied from the opening 310 can easily flow from the first gap 51 into the second gap 52.

[0023] (Magnetic Flux Characteristics of the Rotor) Next, the magnetic flux characteristics of the rotor 30 will be explained. Figure 7 is a diagram illustrating the shape of the rotor of this embodiment and the rotor of the comparative example. Figure 8 is a diagram showing the characteristics of the cogging torque of the motor including cases 1 to 4 of Figure 7. In Figure 7, case 1 has the same shape as the rotor 30 of this embodiment. Case 2 has the same shape as the rotor 30 of this embodiment except that the recess 345 is not included. Case 3 has the same shape as the rotor 30 of this embodiment except that the protrusion 341 is not included. Case 4 has the same shape as the rotor 30 of this embodiment except that the protrusion 341 and the recess 345 are not included. In addition, the adhesive is omitted in Figure 7. In Figure 8, the ratio is the ratio of the effective magnetic flux and cogging torque values ​​of cases 2 to 4 to the effective magnetic flux and cogging torque values ​​of case 1. That is, for example, if the effective magnetic flux in case 1 is 100 × 10⁻⁶ [Wb], then the effective magnetic flux in case 2 is 100.3 × 10⁻⁶ [Wb]. If the cogging torque in case 1 is 100 [mN·m], then the cogging torque in case 2 is 118.0 [mN·m].

[0024] As shown in Figure 8, the rotor 30 of this method, 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.

[0025] (Effective Effect) 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 the 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.

[0026] The corner 342 of the protrusion 341 on the radially inner side of the front end portion includes a chamfer 343. As a result, since the front end portion of the protrusion 341 is enlarged between the first end face 321, the adhesive 40 applied from the opening 310 can easily flow into the first gap 51.

[0027] The corners 323 on both sides of the outer radial side 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.

[0028] 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 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.

[0029] 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. As a result, the output reduction of the motor 100 is suppressed.

[0030] 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. As a result, the reduction in effective magnetic flux caused by leakage magnetic flux from the magnet 32 ​​through the protrusion 341 can be further suppressed.

[0031] 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. 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.

[0032] The hole portion 350 is hexagonal in shape. The hole portion 350 includes inclined surfaces 353 and 354 that are inclined relative to the circumferential end face of the magnet 32 ​​adjacent to the hole portion 350 in the circumferential direction. The inclined surfaces 353 and 354 are inclined toward the circumferential center of the magnetic pole portion 34 where the hole portion 350 is provided, while moving radially outward. As a result, since the magnetic flux is guided along the inclined surfaces 353 and 354, the magnetic flux is guided toward the center of the magnetic pole portion 34 and toward the outer periphery. As a result, the effective magnetic flux can be increased.

[0033] (Embodiment 2) Figure 9 is a perspective view of the rotor of Embodiment 2. The rotor 30A of Embodiment 2 has the same structure as the rotor 30 of Embodiment 1, except for the different structure of the rotor core 31A. Therefore, in Embodiment 2, the same symbols are sometimes used to mark the same structures as in Embodiment 1 and the description is omitted.

[0034] 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. Furthermore, the connecting portion 37 is not limited to a structure 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.

[0035] (Modified Example of Rotor Core) Figure 10 illustrates a modified example of rotor 30B. As shown in Figure 10, the protrusion 341 has a concave portion 348 recessed radially inward on its outer peripheral surface. When viewed radially, the first end 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 349 is located at the circumferential center of the magnetic pole portion 34, which is further than the concave portion 345.

[0036] 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.

[0037] 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 example, the planar portion 347 may also be a plane that is radially inward toward the front end portion of the protrusion 341.

[0038] 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.

[0039] 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, when the adhesive 40 protrudes radially outward from the opening 310, the adhesive 40 is located inside an imaginary circle passing through the outermost diameter of the rotor. Thus, when the rotor rotates, contact between the adhesive 40 and the stator 20 can be suppressed.

[0040] In addition, the present technology can adopt the following structure.

[0041] (1) A rotor, characterized in that it comprises: a rotor core including an annular portion and a plurality of magnetic pole portions extending radially outward from the annular portion; a plurality of magnets respectively disposed in slit portions formed between adjacent magnetic pole portions in the circumferential direction; and an adhesive applied from an opening formed in the radially outward direction of the slit portion to fix the magnetic pole portions and the magnets, the magnetic pole portions comprising: a protrusion protruding from an end portion in the radial direction to both sides in the circumferential direction to form the opening portion; and a side portion facing the magnet in the circumferential direction, the protrusion being located further radially outward than a first end face of the magnet facing radially outward, the side portion including a recess recessing in the circumferential direction from a position overlapping radially with the end portion of the radially outward direction of the magnet, the adhesive being 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.

[0042] (2) The rotor according to (1) is characterized in that the corner of the protrusion on the radially inner side of the front end portion includes a chamfered portion.

[0043] (3)The rotor according to (1) or (2) is characterized in that the corners of the magnet on both sides of the radial outer side include chamfered portions.

[0044] (4)The rotor according to any one of (1) to (3), characterized in that the rotor core includes a support portion that protrudes from the annular portion toward the slit portion to support a second end face of the magnet facing radially inward, the support portion being in contact with the central portion of the second end face in the circumferential direction and not in contact with the two circumferential portions of the second end face in the circumferential direction.

[0045] (5)The rotor according to any one of (1) to (4) is characterized in that the protrusion has a straight planar portion formed on the outer peripheral surface of the radially outer side, or has a concave portion recessed towards the radially inner side formed on the outer peripheral surface of the radially outer side.

[0046] (6) The rotor according to (5) is characterized in that, when viewed from the radial direction, the first end of the planar portion or the concave portion is located on the side opposite to the front end portion of the protrusion, which is located on the circumferential central side of the magnetic pole portion, which is closer to the magnet than the magnet.

[0047] (7)The rotor according to any one of (1) to (6), characterized in that the rotor core includes a connecting portion of the magnetic pole portion that is circumferentially connected to the outer side of the magnetic pole portion.

[0048] (8)The rotor according to any one of (1) to (7) is characterized in that a hole is formed at the radially inner end of the magnetic pole portion, the hole comprising a first parallel surface parallel to the circumferential side surface of the magnet adjacent to one side of the two magnets arranged on both sides of the hole in the circumferential direction, and a second parallel surface 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 surface and the second parallel surface being located radially outer than the second end face of the magnet radially inner.

[0049] (9) The rotor according to (8) is characterized in that the shape of the hole is hexagonal, the hole includes an inclined surface that is inclined relative to the circumferential end face of the magnet adjacent to the hole in the circumferential direction, the inclined surface being inclined toward the circumferential center of the magnetic pole portion on which the hole is provided as it is directed toward the radially outward direction.

[0050] (10) A motor, characterized in that it comprises: a rotor according to any one of (1) to (9); a shaft fixed to the rotor; and a stator comprising a plurality of coiled protrusions arranged at equal angular intervals on the outer periphery of the rotor. [Simplified Explanation of the Diagram]

[0008] Figure 1 is a cross-sectional view along the direction of the rotation axis of the motor of this embodiment. Figure 2 is a cross-section in a direction orthogonal to the rotation axis of the motor of Figure 1. Figure 3 is an external perspective view of the rotor of Embodiment 1. Figure 4 is a top view of the rotor of Embodiment 1. Figure 5 is an enlarged view of region A in Figure 4. Figure 6 is an enlarged view of region B in Figure 5. Figure 7 is a diagram illustrating the shape of the rotor of this embodiment and the rotor of the comparative example. Figure 8 is a diagram showing the characteristics of the cogging torque of the motor including the rotors of cases 1 to 4 in Figure 7. Figure 9 is a perspective view of the rotor of Embodiment 2. Figure 10 is a diagram illustrating the rotor of the modified example.

Claims

1. A rotor, comprising: 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; An adhesive is applied from the opening formed on the radially outer side of the slit portion to fix the magnetic pole portion and the magnet, the magnetic pole portion including: a protrusion that protrudes from the radially outer end to both circumferential sides to form the opening portion; The side portion 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 outward 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 as claimed in claim 1, wherein the corner of the protrusion on the radially inner side of the front end portion includes a chamfer.

3. The rotor as claimed in claim 1 or 2, wherein the corners of the magnets on both radially outer sides include chamfered portions.

4. The rotor as claimed in claim 1, wherein the rotor core includes a support portion that protrudes from the annular portion toward the slit portion to support a second end face of the magnet facing radially inward, the support portion being in contact with the circumferential central portion of the second end face but not with the circumferential side portions of the second end face.

5. The rotor as claimed in claim 1, wherein the protrusion has a straight planar portion formed on its radially outer peripheral surface, or has a concave portion formed on its radially outer peripheral surface that is recessed radially inward.

6. The rotor as claimed in claim 5, wherein, 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, closer to the magnet.

7. The rotor as claimed in claim 1, wherein the rotor core includes a connecting portion of the magnetic pole portions that are circumferentially connected to adjacent magnetic pole portions on the radially outer side of the magnetic pole portions.

8. The rotor as claimed in claim 1, wherein a hole is formed at the radially inner end of the magnetic pole portion, the hole including a first parallel surface parallel to the circumferential side surface of one of the two magnets disposed on both sides of the hole in the circumferential direction adjacent to the circumferential side of the magnet on one side of the circumferential direction, and a second parallel surface parallel to the circumferential side surface of the magnet adjacent to the other side of the circumferential direction, at least a portion of the first parallel surface and the second parallel surface being located radially outer than the second end face of the magnet in the radial direction.

9. The rotor as claimed in claim 8, wherein the bore is hexagonal in shape, the bore including an inclined surface that is inclined relative to the circumferential end face of the magnet adjacent to the bore in the circumferential direction, the inclined surface being inclined toward the circumferential center of the magnetic pole portion on which the bore is disposed as it moves radially outward.

10. A motor, comprising: The rotor as described in claim 1; The shaft is fixed to the rotor; And the stator, including a plurality of coiled protrusions arranged at equal angular intervals on the outer periphery of the rotor.

Images