Rotor and motor
The rotor design with protrusions and recesses ensures adequate adhesive application and flux guidance, enhancing adhesive strength and reducing cogging torque, thereby improving rotor performance.
Patent Information
- Application Number
- JP2024125204
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2026-02-13
AI Technical Summary
The adhesive strength between the rotor core and magnets in existing rotors is insufficient due to inadequate application of adhesive through openings, leading to weak bonding.
A rotor design with protrusions and recesses that allow adhesive to be applied from a first gap to a second gap between the protrusion and magnet, forming an adhesive reservoir and flux barrier, while chamfered corners facilitate adhesive flow, and a support portion ensures easy magnet insertion without corner interference.
Enhances adhesive strength, suppresses cogging torque, and maintains effective magnetic flux, improving rotor performance by ensuring sufficient adhesive application and preventing magnet insertion issues.
Smart Images
Figure 2026023292000001_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to a rotor and a motor.
[0002] A rotor with embedded magnets is described in Patent Document 1. The rotor in 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. The magnets are arranged between adjacent magnetic pole pieces. A protrusion that protrudes circumferentially is provided at both radially outer circumferential ends of the magnetic pole pieces. An opening is formed between the protrusions of adjacent magnetic pole pieces. The end face of the magnet facing radially outward is exposed from the opening. The protrusion is located radially outward from the end face of the magnet facing radially outward. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] Japanese Patent Publication No. 2020-124112 Summary of the Invention [Problem to be solved by the invention]
[0004] In the rotor of Patent Document 1, adhesive is sometimes applied between the protrusion and the magnet through the opening to fix the 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 adhesive strength between the pole piece and the magnet.
[0005] In view of the above problems, an object of the present invention is to provide a rotor that can ensure the amount of adhesive applied through the opening and improve the adhesive strength between the rotor core and the magnet, and a motor using the rotor. [Means for solving the problem]
[0006] In order to solve the above problems, the rotor of the present invention includes 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 disposed in slits formed between the magnetic pole portions adjacent in the circumferential direction; an adhesive that is applied from an opening formed on the radial outside of the slit portion and fixes the magnetic pole portion and the magnet; Equipped with The magnetic pole portion includes a protruding portion that protrudes from a radially outer end portion to both sides in the circumferential direction to form the opening, and a side portion that faces the magnet in the circumferential direction, the protrusion is located radially outward from a first end face of the magnet that faces radially outward, the side surface portion includes a recess recessed in a circumferential direction from a position radially overlapping with a radially outer end portion of the magnet toward the radially outer side, The adhesive is characterized in that it is applied from a first gap formed between the protrusion and the first end face in the radial direction to at least a portion of a second gap formed between the recess and the magnet in the circumferential direction.
[0007] The motor of the present invention is characterized by comprising the rotor described above, a shaft fixed to the rotor, and a stator having a plurality of salient poles around which coils are wound, the salient poles being arranged at equal angular intervals on the outer periphery of the rotor. [Brief explanation of the drawings]
[0008] [Figure 1] FIG. 1 is a cross-sectional view taken along the rotation axis of the motor of this embodiment. [Figure 2] FIG. 2 is a cross section of the motor of FIG. 1 taken in a direction perpendicular to the rotation axis. [Figure 3] FIG. 3 is a perspective view of the rotor of the first embodiment. [Figure 4] FIG. 4 is a plan view of the rotor of the first embodiment. [Figure 5] FIG. 5 is an enlarged view of area A in FIG. [Figure 6]FIG. 6 is an enlarged view of region B in FIG. [Figure 7] FIG. 7 is a diagram illustrating the shapes of the rotor of this embodiment and a rotor of a comparative example. [Figure 8] FIG. 8 is a diagram showing the cogging torque characteristics of a motor equipped with the rotors of CASE 1 to CASE 4 in FIG. [Figure 9] FIG. 9 is a perspective view of the rotor of the second embodiment. [Figure 10] FIG. 10 is a diagram illustrating a rotor according to a modified example. DETAILED DESCRIPTION OF THE INVENTION
[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a rotor and a motor to which the present invention is applied will be described with reference to the drawings.
[0010] (Embodiment 1) FIG. 1 is a cross-sectional view along the rotation axis L of a motor 100 of this embodiment. FIG. 2 is a cross-sectional view perpendicular to the rotation axis L of the motor 100 of FIG. 1. FIG. 3 is an external perspective view of a rotor 30 of embodiment 1. FIG. 4 is a plan view of the rotor 30 of embodiment 1. FIG. 5 is an enlarged view of area A in FIG. 4. FIG. 6 is an enlarged view of area B in FIG. 5. In this specification, one side in the axial direction along the rotation axis L is referred to as the "output side L1 (the side from which the shaft 11 protrudes)," and the other side opposite the output side L1 is referred to as the "anti-output side L2."
[0011] (Overall structure) The motor 100 shown in FIG. 1 is an interior magnet motor with a magnet embedded in a rotor core. As shown in FIG. 1, 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 having an opening oriented in the axial direction along the rotation axis L of the motor 100, a first bearing holder 14 fixed to the end of the cylindrical portion 13 on the output side L1, and a second bearing holder 15 fixed to the end of the cylindrical portion 13 on the counter-output side L2. The inner periphery of the first bearing holder 14 holds the outer ring of a first bearing 16, which is a ball bearing. The inner periphery of the second bearing holder 15 holds the outer ring of a second bearing 17, which is also a ball bearing. An encoder (not shown) is disposed on the counter-output side L2 of the second bearing holder 15. The encoder detects the rotation speed and angular position of the rotor 30 .
[0012] As shown in FIGS. 1 and 2 , the stator 20 includes an annular stator core 21 having a plurality of salient poles 24 protruding radially inward at equal angular intervals, and a coil 23 wound around each salient pole 24 of the stator core 21 via an insulating member 22, and is fixed to the inside of the cylindrical portion 13. The coil 23 is connected to a wiring board (not shown) disposed at an 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, U-phase, V-phase, and W-phase, are supplied to the coil 23 wound around the salient poles 24.
[0013] 2, 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, magnets 32 embedded in the rotor core 31, and an adhesive 40 that fixes the rotor core 31 and the magnets 32 together.
[0014] (rotor core) The rotor core 31 is a laminated body formed by stacking multiple magnetic plates (magnetic plates) such as silicon steel plates. As shown in FIGS. 3 and 4 , the rotor core 31 includes an annular portion 33 that fixes the shaft 11 to its inner periphery, multiple magnetic pole portions 34 that extend radially outward from the annular portion 33, and support portions 36 that support the inner periphery of the magnets 32. The magnetic pole portions 34 are arranged at equal angular intervals. Slit portions 50 are formed between adjacent magnetic pole portions 34 in the circumferential direction. The magnets 32 are inserted axially into the slit portions 50 and embedded therein. When the magnets 32 are inserted into the slit portions 50, an adhesive is applied to the side surfaces of the magnets 32.
[0015] 5 and 6, the magnetic pole portion 34 includes protruding portions 341 that protrude from the radially outer end portion to both sides in the circumferential direction and form openings 310 on the radially outer side of the slit portion 50, and a side surface portion 344 that faces the magnet 32 in the circumferential direction. The protruding portion 341 has a linear flat portion 347 formed on the outer peripheral surface on the radially outer side.
[0016] As shown in FIG. 6, the flat portion 347 is a plane perpendicular to the axis P extending circumferentially from the center. Furthermore, the radially inner circumferential surface of the protruding portion 341 is a plane perpendicular to the axis P extending circumferentially from the center. Therefore, the radial thickness of the protruding portion 341 is approximately constant in the circumferential direction. The protruding portion 341 is located radially outward from the first end face 321 facing radially outward of the magnet 32. The side surface portion 344 has a recess 345 recessed in the circumferential direction from a position radially overlapping with the radially outer end portion of the magnet 32 toward the protruding portion 341 at the radially outer end.
[0017] 6, a first end 349 of the flat portion 347 opposite to the tip end of the protrusion 341 is located toward the center in the circumferential direction of the magnetic pole portion 34, opposite the magnet 32, when viewed from the radial direction. In this embodiment, the first end 349 is located toward the center in the circumferential direction of the magnetic pole portion 34 with respect to the recess 345 when viewed from the radial direction.
[0018] 5, the support portion 36 protrudes from the annular portion 33 into the slit portion 50 and supports the second end surface 322 facing radially inward of the magnet 32. The support portion 36 contacts the circumferential central portion of the second end surface 322, but does not contact either side of the second end surface 322 in the circumferential direction. In other words, a recess 361 is formed between the support portion 36 and the side surface 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 shape of the hole 350 is hexagonal. Magnets 32 are disposed on both circumferential sides of the hole 350. One of the inner circumferential surfaces of the hole 350 is a first parallel surface 351 parallel to the circumferential side surface 324 of the adjacent magnet 32A on one circumferential side. The other of the inner circumferential surfaces of the hole 350 is a second parallel surface 352 parallel to the circumferential side surface 324 of the adjacent magnet 32B on the other circumferential side. At least a portion of the first parallel surface 351 is located radially outward from the inner circumferential side surface 324 of the magnet 32A. At least a portion of the second parallel surface 352 is located radially outward from the inner circumferential side surface 324 of the magnet 32B. As a result, the portions between the hole 350 and the magnets 32A, 32B are thin and have a uniform thickness, so that leakage magnetic flux passing through the inner peripheral end of the magnetic pole portion 34 is suppressed.
[0020] The inner peripheral surface of the hole 350 is composed of an innermost peripheral surface 355 connecting the inner peripheral ends of the first parallel surface 351 and the second parallel surface 352, an outermost peripheral surface 356 facing the innermost peripheral surface 355, an inclined surface 353 located between the outermost peripheral surface 356 and the first parallel surface 351, and an inclined surface 354 located between the outermost peripheral surface 356 and the second parallel surface 352. The inclined surfaces 353 and 354 are inclined with respect to the circumferential side surfaces 324 of the magnets 32A and 32B adjacent to the hole 350 in the circumferential direction. The inclined surfaces 353 and 354 are inclined toward the circumferential center of the magnetic pole portion 34 in which the hole 350 is provided. As a result, the magnetic flux passing through the magnetic pole portion 34 is inclined toward the inclined surfaces 353 and 354. It is directed in the direction of 354.
[0021] (glue) As shown in FIGS. 5 and 6 , the adhesive 40 is applied through the opening 310 to secure the magnetic pole portion 34 and the magnet 32. When the adhesive 40 is applied through the opening 310, it flows from the first gap 51 formed between the protrusion 341 and the first end face 321 in the radial direction to at least a portion of the second gap 52 formed between the recess 345 and the magnet 32 in the circumferential direction. That is, the adhesive 40 is applied from the first gap 51 to at least a portion of the second gap 52. In this embodiment, the adhesive 40 is applied to the entire second gap 52. The second gap 52 functions as an adhesive reservoir and also as a flux barrier. Although not shown, the magnetic pole portion 34 and the magnet 32 are also secured by the adhesive applied to the side surface 324 of the magnet 32 when the magnet 32 is inserted into the slit portion 50.
[0022] 6, protrusion 341 has chamfered portions 343 at radially inner corners 342 of its tip portion. Magnet 32 has chamfered portions 325 at both radially outer corners 323. Chamfered portions 343 and 325 have a C-chamfered shape or an R-chamfered shape. This makes it easier for adhesive 40 applied from opening 310 to flow from first gap 51 to second gap 52.
[0023] (Rotor magnetic flux characteristics) Next, the magnetic flux characteristics of the rotor 30 will be described. FIG. 7 is a diagram illustrating the shapes of the rotor of this embodiment and a rotor of a comparative example. FIG. 8 is a diagram illustrating the cogging torque characteristics of a motor equipped with the rotors of CASE 1 to CASE 4 of FIG. 7. In FIG. 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 it does not have the recessed portion 345. CASE 3 has the same shape as the rotor 30 of this embodiment except that it does not have the protruding portion 341. CASE 4 has the same shape as the rotor 30 of this embodiment except that it does not have the protruding portion 341 or the recessed portion 345. Note that adhesive is omitted in FIG. 7. In FIG. 8, the ratios are the ratios of the effective magnetic flux and cogging torque values of CASE 2 to the effective magnetic flux and cogging torque values of CASE 1. That is, for example, when the effective magnetic flux value of CASE 1 is 100×10 -6 [Wb], the value of the effective magnetic flux in CASE2 is 100.3×10 -6 [Wb], and if the cogging torque value of CASE 1 is 100 [mN·m], the cogging torque value of CASE 2 is 118.0 [mN·m].
[0024] 8, the rotor 30 of this embodiment, which is CASE 1, effectively suppresses the cogging torque while suppressing the decrease in effective magnetic flux. Here, in terms of performance of the motor 100, it is desirable to further suppress the cogging torque.
[0025] (Action and effect) According to the rotor of this embodiment, adhesive 40 is applied from first gap 51 formed between protrusion 341 and first end face 321 in the radial direction to at least a portion of second gap 52 formed between recess 345 and magnet 32 in the circumferential direction. This ensures a sufficient amount of adhesive 40 to be applied from opening 310, thereby improving the adhesive strength between rotor core 31 and magnet 32. Furthermore, recess 345 is provided radially outward from a position that radially overlaps with the radially outer end portion of magnet 32, so second gap 52 functions as an adhesive reservoir and also as a flux barrier.
[0026] The protrusion 341 has a chamfered portion 343 at a corner 342 on the radially inner side of the tip portion. This widens the gap between the tip portion of the protrusion 341 and the first end face 321, thereby increasing the width of the opening 310. The adhesive 40 applied from the first gap 51 is more likely to flow into the first gap 51.
[0027] The magnet 32 has chamfered portions 325 at both corners 323 on the outer side in the radial direction. The adhesive 40 applied from the opening 310 flows from the first gap 51 into the second gap 52 more easily.
[0028] The rotor core 31 includes a support portion 36 that protrudes from the annular portion 33 into the slit portion 50 and supports the second end surface 322 of the magnet 32, which faces radially inward. The support portion 36 contacts a circumferential central portion of the second end surface 322, but does not contact both circumferential side portions of the second end surface 322. As a result, no corners are formed between the abutment surface of the support portion 36 and the side surface portion 344 of the magnetic pole portion 34, so that when the magnet 32 is inserted into the slit portion 50, the radially inner corners of the magnet 32 can be prevented from getting caught 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 linear flat portion 347 formed on the outer peripheral surface on the radially outer side, which makes it possible to suppress a decrease in effective magnetic flux due to leakage magnetic flux passing from the magnet 32 through the protrusion 341. As a result, it is possible to suppress a decrease in the output of the motor 100.
[0030] When viewed from the radial direction, a first end 349 of the flat portion 347 opposite to the tip end of the protrusion 341 is located closer to the center in the circumferential direction of the magnetic pole portion 34 with respect to the recess 345. This makes it possible to further suppress a decrease in effective magnetic flux due to leakage magnetic flux passing from the magnet 32 through the protrusion 341.
[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 adjacent magnet 32A on one circumferential side of the two magnets 32 arranged on both circumferential sides of the hole 350, and a second parallel surface 352 parallel to the circumferential side surface of the adjacent magnet 32B on the other circumferential side. At least a portion of the first parallel surface 351 and the second parallel surface 352 is located radially outward of the radially inner second end face 322 of the magnet 32. In this manner, the hole 350 can reduce leakage magnetic flux from the magnet 32 toward the radially inner side of the magnetic pole portion 34, thereby suppressing a decrease in effective magnetic flux.
[0032] The shape of the hole 350 is hexagonal. The hole 350 has inclined surfaces 353, 354 that are inclined with respect to the circumferential end face of the magnet 32 circumferentially adjacent to the hole 350. The inclined surfaces 353, 354 are inclined in a direction toward the circumferential center of the magnetic pole portion 34 in which the hole 350 is provided as they extend radially outward. As a result, the magnetic flux is guided along the inclined surfaces 353, 354, and 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) 9 is a perspective view of a rotor according to embodiment 2. A rotor 30A according to embodiment 2 has the same configuration as the rotor 30 according to embodiment 1, except for a different configuration of a rotor core 31A. Therefore, in embodiment 2, the same components as those in embodiment 1 are denoted by the same reference numerals, and descriptions thereof may be omitted.
[0034] The rotor core 31A includes connecting portions 37 that connect adjacent magnetic pole portions 34 in the circumferential direction on the radially outer side of the magnetic pole portions 34. In this embodiment, the connecting portions 37 are provided at both axial end portions of the rotor core 31. Note that the connecting portions 37 are not limited to being provided at both axial end portions of the rotor core 31. For example, the connecting portions 37 may be provided at the axial center portion of the rotor core 31 in addition to both axial end portions of the rotor core 31. Furthermore, the connecting portions 37 may be provided only at the axial center portion of the rotor core 31. According to the rotor 30A of this embodiment, since the rotor core 31A includes the connecting portions 37, the magnets 32 are arranged Even when the openings 310 are formed radially outward of the slits 50, it is possible to prevent the strength of the rotor core 31A from decreasing.
[0035] (Modified rotor core) 10 is a diagram illustrating a modified rotor 30B. As shown in FIG. 10, a concave portion 348 that is recessed radially inward is formed on the outer peripheral surface of the radially outer side of the protruding portion 341. A first end 349 of the concave portion 348 opposite the tip end portion of the protruding portion 341 is located toward the center of the circumferential direction of the magnetic pole portion 34, opposite the magnet 32, when viewed from the radial direction. In this embodiment, the first end 349 is located toward the center of the circumferential direction of the magnetic pole portion 34 from the recess 345 when viewed from the radial direction.
[0036] Furthermore, since the concave surface 348 is recessed radially inward, the radial thickness of the protruding portion 341 gradually decreases toward the tip portion. Even with the rotor 30B of the modified example, the same effects as those of the first embodiment can be obtained.
[0037] In the rotor of embodiment 1, the flat portion 347 is a plane perpendicular to the axis extending circumferentially from the center, but in the rotor of the modified example, the flat portion 347 may be a plane that inclines radially inward toward the tip 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 example, the adhesive 40 only needs to be applied to at least a portion of the second gap 52.
[0039] In the rotor of the above embodiment, adhesive 40 is applied to a portion of opening 310 (the edge portion at the tip of protrusion 341) when viewed from the radial outside, but in a rotor of a modified example, adhesive 40 may be applied so as to cover the entire opening 310 when viewed from the radial outside. In this case, if adhesive 40 bulges radially outward from opening 310, adhesive 40 is located inside an imaginary circle that passes through the outermost diameter of the rotor. This makes it possible to prevent adhesive 40 from coming into contact with stator 20 when the rotor rotates.
[0040] The present technology can be configured as follows.
[0041] (1) 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 disposed in slits formed between the magnetic pole portions adjacent in the circumferential direction; an adhesive that is applied from an opening formed on the radial outside of the slit portion and fixes the magnetic pole portion and the magnet; Equipped with The magnetic pole portion includes a protruding portion that protrudes from a radially outer end portion to both sides in the circumferential direction to form the opening, and a side portion that faces the magnet in the circumferential direction, the protrusion is located radially outward from a first end face of the magnet that faces radially outward, the side surface portion includes a recess recessed in a circumferential direction from a position radially overlapping with a radially outer end portion of the magnet toward the radially outer side, The rotor is characterized in that the adhesive is applied from a first gap formed between the protrusion and the first end face in the radial direction to at least a portion of a second gap formed between the recess and the magnet in the circumferential direction.
[0042] (2) The rotor according to (1), wherein the protrusion has a chamfered portion at a radially inner corner of the tip portion.
[0043] (3) The rotor according to (1) or (2), wherein the magnet has chamfered corners on both radially outer sides.
[0044] (4) the rotor core includes a support portion that protrudes from the annular portion to the slit portion and supports a second end surface of the magnet that faces radially inward, The rotor described in any one of (1) to (3) is characterized in that the support portion is in contact with the circumferential central portion of the second end face and is not in contact with both circumferential side portions of the second end face.
[0045] (5) The rotor described in any one of (1) to (4) is characterized in that the protrusion has a linear flat portion formed on the outer peripheral surface on the radially outer side, or a concave portion formed on the outer peripheral surface on the radially outer side that is recessed radially inward.
[0046] (6) The rotor described in (5) is characterized in that the first end of the flat portion or the concave portion opposite the tip portion of the protrusion is located closer to the circumferential center of the magnetic pole portion than the magnet when viewed radially.
[0047] (7) The rotor according to any one of (1) to (6), wherein the rotor core has a connecting portion that connects adjacent magnetic pole portions in the circumferential direction on the radially outer side of the magnetic pole portions.
[0048] (8) A hole is formed at the radially inner end of the magnetic pole portion, The hole has a first parallel surface parallel to the circumferential side surface of the adjacent magnet on one circumferential 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 adjacent magnet on the other circumferential side, A rotor described in any one of (1) to (7), characterized in that at least a portion of the first parallel surface and the second parallel surface is located radially outward from a radially inner second end face of the magnet.
[0049] (9) The shape of the hole is hexagonal, the hole has an inclined surface inclined with respect to an end surface in the circumferential direction of the magnet adjacent to the hole in the circumferential direction, The rotor according to (8), wherein the inclined surface is inclined in a direction toward the circumferential center of the magnetic pole portion in which the hole is provided as it extends radially outward.
[0050] (10) A rotor according to any one of (1) to (9), a shaft fixed to the rotor; a stator including a plurality of salient poles around which coils are wound, the salient poles being arranged at equal angular intervals on the outer periphery of the rotor; A motor comprising: [Explanation of symbols]
[0051] 100...motor, 11...shaft, 12...housing, 13...cylindrical portion, 14...first bearing holder, 15...second bearing holder, 16...first bearing, 17...second bearing, 20...stator, 21...stator core, 22...insulating member, 23...coil, 24...salient pole, 30, 30A, 30B...rotor, 31, 31A...rotor core, 32...magnet, 33...annular portion, 34...magnetic pole portion, 36...support portion, 37...connecting portion, 40...adhesive, 50...slit portion, 51...first Gap, 52...second gap, 310...opening, 321...first end surface, 322...second end surface, 323...corner portion, 324...side surface, 325...chamfered portion, 341...protrusion, 342...corner portion, 343...chamfered portion, 344...side surface portion, 345...recess, 347...flat portion, 348...concave portion, 349...first end portion, 350...hole portion, 351...first parallel surface, 352...second parallel surface, 353...inclined surface, 354...inclined surface, 355...innermost surface, 356...outermost surface, 361...recess.
Claims
1. 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 disposed in slits formed between the magnetic pole portions adjacent in the circumferential direction; an adhesive that is applied from an opening formed on the radial outside of the slit portion and fixes the magnetic pole portion and the magnet; Equipped with The magnetic pole portion includes a protruding portion that protrudes from a radially outer end portion to both sides in the circumferential direction to form the opening, and a side surface portion that faces the magnet in the circumferential direction, the protruding portion is located radially outward from a first end surface of the magnet that faces radially outward, the side surface portion includes a recess recessed in a circumferential direction from a position radially overlapping with a radially outer end portion of the magnet toward the radially outer side, A rotor characterized in that the adhesive is applied from a first gap formed between the protrusion and the first end face in the radial direction to at least a portion of a second gap formed between the recess and the magnet in the circumferential direction.
2. The rotor according to claim 1 , wherein the protrusion has a chamfered portion at a radially inner corner of a tip portion.
3. 3. The rotor according to claim 1, wherein the magnet has chamfered corners on both radially outer sides.
4. the rotor core includes a support portion that protrudes from the annular portion to the slit portion and supports a second end surface of the magnet that faces radially inward, 2. The rotor according to claim 1, wherein the support portion is in contact with a central portion of the second end face in the circumferential direction, but is not in contact with both side portions of the second end face in the circumferential direction.
5. 2. The rotor according to claim 1, wherein the protrusion has a linear flat portion formed on the outer peripheral surface on the radially outer side, or a concave portion formed on the outer peripheral surface on the radially outer side that is recessed radially inward.
6. The rotor according to claim 5, characterized in that the first end of the flat portion or the concave portion opposite the tip portion of the protrusion is located closer to the circumferential center of the magnetic pole portion than the magnet when viewed radially.
7. 2. The rotor according to claim 1, wherein the rotor core includes a connecting portion that connects adjacent magnetic pole portions in the circumferential direction, radially outside the magnetic pole portions.
8. A hole is formed at the radially inner end of the magnetic pole portion, the hole includes a first parallel surface parallel to the circumferential side surface of the adjacent magnet on one circumferential side of the two magnets arranged on both circumferential sides of the hole, and a second parallel surface parallel to the circumferential side surface of the adjacent magnet on the other circumferential side, 2. The rotor according to claim 1, wherein at least a portion of the first parallel surface and the second parallel surface is located radially outward of a second end face of the magnet that is located radially inward.
9. The shape of the hole is hexagonal, the hole has an inclined surface inclined with respect to an end surface in the circumferential direction of the magnet adjacent to the hole in the circumferential direction, The inclined surface is such that the circumferential direction of the magnetic pole portion in which the hole is provided becomes gradually larger as it moves radially outward.
9. The rotor according to claim 8, wherein the rotor is inclined in a direction toward the center of the rotor.
10. The rotor according to claim 1; a shaft fixed to the rotor; a stator including a plurality of salient poles around which coils are wound, the salient poles being arranged at equal angular intervals on the outer periphery of the rotor; A motor comprising:
Citation Information
Patent Citations
Rotor, motor in which rotor is used and electronic apparatus
JP2020124112A