WO2021192236A1 - 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法 - Google Patents
回転子、電動機、送風機、空気調和装置、及び回転子の製造方法 Download PDFInfo
- Publication number
- WO2021192236A1 WO2021192236A1 PCT/JP2020/014062 JP2020014062W WO2021192236A1 WO 2021192236 A1 WO2021192236 A1 WO 2021192236A1 JP 2020014062 W JP2020014062 W JP 2020014062W WO 2021192236 A1 WO2021192236 A1 WO 2021192236A1
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- WIPO (PCT)
- Prior art keywords
- rotor
- permanent magnet
- bond magnet
- rare earth
- overhanging
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 12
- 238000004378 air conditioning Methods 0.000 title 1
- 229910000859 α-Fe Inorganic materials 0.000 claims description 199
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 181
- 230000002093 peripheral effect Effects 0.000 claims description 21
- 229920005989 resin Polymers 0.000 claims description 21
- 239000011347 resin Substances 0.000 claims description 21
- 230000004048 modification Effects 0.000 description 53
- 238000012986 modification Methods 0.000 description 53
- 230000004323 axial length Effects 0.000 description 22
- 230000004907 flux Effects 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 19
- 239000002994 raw material Substances 0.000 description 12
- 238000000465 moulding Methods 0.000 description 10
- 238000009826 distribution Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000004734 Polyphenylene sulfide Substances 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229920000069 polyphenylene sulfide Polymers 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004412 Bulk moulding compound Substances 0.000 description 2
- 102100035353 Cyclin-dependent kinase 2-associated protein 1 Human genes 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 229920006337 unsaturated polyester resin Polymers 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 101000737813 Homo sapiens Cyclin-dependent kinase 2-associated protein 1 Proteins 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 102100029860 Suppressor of tumorigenicity 20 protein Human genes 0.000 description 1
- PRQMIVBGRIUJHV-UHFFFAOYSA-N [N].[Fe].[Sm] Chemical compound [N].[Fe].[Sm] PRQMIVBGRIUJHV-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Definitions
- This disclosure relates to a rotor, a motor, a blower, an air conditioner, and a method for manufacturing a rotor.
- the purpose of this disclosure is to prevent the permanent magnets from falling off.
- the rotor includes a rotation shaft and a rotor body supported by the rotation shaft, and the rotor body has a first permanent magnet and a second permanent magnet.
- the second permanent magnet has a first overhanging portion that is in contact with the first end portion of the first permanent magnet in the axial direction of the rotation axis, and the first overhanging portion and the first overhanging portion. The ends of the are joined to each other.
- FIG. 1 It is a side view which shows the structure of the rotor which concerns on Embodiment 1.
- FIG. It is a top view which shows the structure of the rotor which concerns on Embodiment 1.
- FIG. It is a bottom view which shows the structure of the rotor which concerns on Embodiment 1.
- FIG. It is a top view which shows the structure of the 2nd permanent magnet which concerns on Embodiment 1.
- FIG. It is sectional drawing which cut
- FIG. It is a flowchart which shows the detail of the process of forming a rotor main body which concerns on Embodiment 1.
- FIG. It is a top view which shows the structure of the rotor main body which concerns on a comparative example. It is a graph which shows the distribution of the surface magnetic flux density of the rotor main body which concerns on Embodiment 1, and the distribution of the surface magnetic flux density of the rotor main body which concerns on a comparative example.
- It is a partial cross-sectional view which shows the structure of the rotor main body which concerns on Embodiment 2.
- FIG. It is a partial cross-sectional view which shows the structure of the rotor main body in the modification of Embodiment 2.
- FIG. 1 is an enlarged plan view showing a part of the structure of the rotor main body according to the fourth embodiment.
- B is an enlarged bottom view showing a part of the configuration of the rotor main body according to the fourth embodiment.
- FIG. 20 A) cut along the line A20-A20. It is a top view which shows the structure of the rotor main body which concerns on Embodiment 5.
- FIG. 1 is another cross-sectional view showing the configuration of the rotor main body according to the third modification of the seventh embodiment. It is a block diagram which shows the partial cross section and the side surface of the electric motor which concerns on Embodiment 8. It is a figure which shows schematic the structure of the air conditioner which concerns on Embodiment 9. FIG.
- the drawing shows the xyz Cartesian coordinate system for easy understanding of the description.
- the z-axis is a coordinate axis parallel to the axis of the rotor.
- the x-axis is a coordinate axis orthogonal to the z-axis.
- the y-axis is a coordinate axis orthogonal to both the x-axis and the z-axis.
- FIG. 1 is a side view showing the configuration of the rotor 1 according to the first embodiment.
- FIG. 2 is a plan view showing the configuration of the rotor 1 according to the first embodiment.
- the figure is a bottom view which shows the structure of the rotor 1 which concerns on embodiment 1.
- the rotor 1 includes a shaft 10 as a rotating shaft, a rotor main body 11 supported by the shaft 10, and a connecting portion 12 connecting the shaft 10 and the rotor main body 11. have.
- the rotor 1 is rotatable about the axis C1 of the shaft 10.
- the shaft 10 extends in the z-axis direction.
- the direction along the circumference of the circle centered on the axis C1 of the shaft 10 is referred to as "circumferential direction”
- the z-axis direction is referred to as “axial direction”
- the direction orthogonal to the axial direction is referred to as “diameter direction”. ..
- the rotor body 11 has a plurality of rare earth bond magnets 21 as first permanent magnets and a ferrite bond magnet 22 as second permanent magnets. That is, the two permanent magnets (hereinafter, also referred to as "bond magnets") of the rotor body 11 are of different types. Specifically, the two permanent magnets of the rotor body 11 have different magnetic pole strengths (that is, magnetic charges) from each other. In the first embodiment, the strength of the magnetic poles of the rare earth bond magnet 21 is larger than the strength of the magnetic poles of the ferrite bond magnet 22. Further, in the first embodiment, the two bond magnets of the rotor main body 11 have different coefficients of linear expansion from each other.
- the rare earth bond magnet 21 includes a rare earth magnet and a resin.
- Rare earth magnets include, for example, neodymium magnets containing neodymium (Nd), iron (Fe) and boron (B), or samarium iron-nitrogen magnets containing samarium (Sm), iron (Fe) and nitrogen (N).
- the resin contained in the rare earth bond magnet is, for example, a nylon resin, a PPS (Polyphenylene sulfide) resin, an epoxy resin, or the like.
- the ferrite bond magnet 22 includes a ferrite magnet and a resin.
- the resin contained in the ferrite bond magnet 22 is a nylon resin, a PPS resin, an epoxy resin, or the like, similarly to the resin contained in the rare earth bond magnet.
- FIG. 4 is a plan view showing the configuration of the ferrite bond magnet 22.
- the planar shape of the ferrite bond magnet 22 parallel to the xy plane is an annular shape centered on the axis C1.
- the outer peripheral surface 22e of the ferrite bond magnet 22 forms a part of the outer peripheral surface 11a (see FIG. 2) of the rotor main body 11.
- the ferrite bond magnet 22 has a plurality of (eight in FIG. 4) groove portions 22f formed between a plurality of outer peripheral surfaces 22e adjacent to each other in the circumferential direction R1.
- the plurality of groove portions 22f are arranged at intervals in the circumferential direction R1 about the axis C1.
- the groove portion 22f is a long groove that is long in the axial direction.
- the ferrite bond magnet 22 is oriented so as to have polar anisotropy.
- the bottom surfaces 22g of the plurality of groove portions 22f adjacent to the circumferential direction R1 have magnetic poles having different polarities from each other.
- the arcuate arrow F2 shown in FIG. 4 indicates the direction of the magnetic flux in the ferrite bond magnet 22.
- the magnetic flux flowing from the radial outside of the groove portion 22f of the S pole proceeds to the groove portion 22f of the N pole adjacent in the circumferential direction. Therefore, the rotor 1 does not require a rotor core that forms a magnetic path inside the ferrite bond magnet 22 in the radial direction. Therefore, the number of parts in the rotor 1 can be reduced, and the weight of the rotor 1 can be reduced.
- the connecting portion 12 is formed of, for example, an unsaturated polyester resin.
- the connecting portion 12 has an inner cylinder portion 12a, an outer cylinder portion 12b, and a plurality of (four in the first embodiment) ribs 12c.
- the inner cylinder portion 12a has a cylindrical shape and is fixed to the outer peripheral surface of the shaft 10.
- the outer cylinder portion 12b has a cylindrical shape and is fixed to the inner peripheral surface of the ferrite bond magnet 22.
- the plurality of ribs 12c connect the inner cylinder portion 12a and the outer cylinder portion 12b.
- the plurality of ribs 12c extend radially outward from the inner cylinder portion 12a.
- the plurality of ribs 12c are arranged at equiangular positions in the circumferential direction R1 with the axis C1 as the center.
- the ferrite bond magnet 22 may be directly fixed to the shaft 10 without passing through the connecting portion 12.
- a plurality of rare earth bond magnets 21 (8 in the first embodiment) are supported by the ferrite bond magnet 22.
- the plurality of rare earth bond magnets 21 are arranged at intervals in the circumferential direction R1.
- Each outer peripheral surface 21c of the plurality of rare earth bond magnets 21 forms a part of the outer peripheral surface 11a of the rotor main body 11.
- Each of the plurality of rare earth bond magnets 21 is oriented so as to have polar anisotropy.
- the plurality of rare earth bond magnets 21 adjacent to the circumferential direction R1 have magnetic poles having different polarities from each other.
- the arcuate arrow F1 shown in FIGS. 2 and 3 indicates the direction of the magnetic flux in the rare earth bond magnet 21.
- the magnetic flux flowing from the radial outside of the S-pole rare earth bond magnet 21 proceeds to the N-pole rare earth bond magnet 21 adjacent to the circumferential direction R1.
- the rotor main body 11 has eight magnetic poles.
- the number of poles of the rotor body 11 is not limited to eight, and may be 2n or more. n is a natural number of 1 or more.
- FIG. 5 is a cross-sectional view of the rotor 1 shown in FIG. 1 cut along the A5-A5 line.
- FIG. 6 is a cross-sectional view of the rotor body 11 shown in FIG. 5 cut along the A6-A6 line.
- the shaft 10 and the connecting portion 12 are not shown.
- the rare earth bond magnet 21 has a pillar portion 41, a first overhanging portion 42, and a second overhanging portion 43.
- the pillar portion 41 is arranged in the groove portion 22f (see FIG. 4) of the ferrite bond magnet 22.
- the pillar portion 41 is arranged radially outside the bottom surface 22g of the groove portion 22f.
- the pillar portion 41 extends in the axial direction.
- the axial length L41 of the column portion 41 is longer than the axial length L22 of the ferrite bond magnet 22.
- the shape of the pillar portion 41 when viewed in the ⁇ z axis direction is, for example, a fan shape.
- the inner peripheral surface and the outer peripheral surface of the pillar portion 41 are formed concentrically. That is, the thickness of the pillar portion 41 in the xy plane is constant in the circumferential direction R1.
- the first overhanging portion 42 extends inward in the radial direction from the end portion 41a on the + z axis side of the pillar portion 41.
- the pillar portion 41 is located radially outside the first overhanging portion 42.
- the first overhanging portion 42 is in contact with the + z-axis side end portion 22c as the first end portion of the ferrite bond magnet 22.
- the width of the circumferential direction R1 in the first overhanging portion 42 becomes narrower toward the inner side in the radial direction.
- the shape of the first overhanging portion 42 when viewed in the ⁇ z axis direction is, for example, a substantially triangular shape.
- the second overhanging portion 43 extends radially inward from the end portion 41b on the ⁇ z axis side of the pillar portion 41.
- the second overhanging portion 43 is in contact with the end portion 22d on the ⁇ z axis side as the second end portion of the ferrite bond magnet 22.
- the width of the circumferential direction R1 in the second overhanging portion 43 becomes narrower toward the inner side in the radial direction.
- the shape of the second overhanging portion 43 when viewed in the ⁇ z axis direction is, for example, substantially a triangle, as in the case of the first overhanging portion 42.
- the shape of the first overhanging portion 42 and the shape of the second overhanging portion 43 when viewed in the ⁇ z axis direction are not limited to a substantially triangular shape, and may be other shapes. Further, the rare earth bond magnet 21 may have only one of the first overhanging portion 42 and the second overhanging portion 43.
- the rare earth bond magnet 21 and the ferrite bond magnet 22 are integrally molded (also referred to as "two-color molding"), whereby the pillar portion 41 and the groove portion 22f are joined.
- the rare earth bond magnet 21 and the ferrite bond magnet 22 are integrally molded means that the rare earth bond magnet 21 is molded with the previously manufactured ferrite bond magnet 22 placed in the mold. Then, the rare earth bond magnet 21 and the ferrite bond magnet 22 are integrated.
- the first overhanging portion 42 and the end portion 22c of the ferrite bond magnet 22 on the + z axis side are joined, and the second overhanging portion 43 and the ferrite bond magnet 22 on the ⁇ z axis side are joined.
- the end 22d is joined.
- the bonding area between the rare earth bond magnet 21 and the ferrite bond magnet 22 can be increased. ..
- the rare earth bond magnet 21 falls off from the ferrite bond magnet 22. Can be prevented.
- FIG. 7 is a flowchart showing a manufacturing process of the rotor 1.
- step ST1 the rotor body 11 is formed.
- the details of step ST1 will be described later.
- step ST2 the rotor body 11 is connected to the shaft 10.
- the rotor main body 11 and the shaft 10 are integrated via the connecting portion 12, so that the rotor main body 11 is connected to the shaft 10.
- step ST3 for example, the rotor body 11 is magnetized using a magnetizer. Specifically, the rare earth bond magnet 21 and the ferrite bond magnet 22 are magnetized so that the rare earth bond magnet 21 and the ferrite bond magnet 22 have polar anisotropy.
- FIG. 8 is a flowchart showing details of the process of forming the rotor main body 11.
- a second mold for molding the ferrite bond magnet 22 and a first mold for molding the rare earth bond magnet 21 supported by the ferrite bond magnet 22 are used.
- a magnet for orientation is used.
- step ST11 the raw material of the ferrite bond magnet 22 is filled inside the second mold for molding the ferrite bond magnet 22.
- the ferrite bond magnet 22 is formed by, for example, injection molding.
- the ferrite bond magnet 22 is not limited to injection molding and may be molded by another molding method such as pressure molding.
- step ST12 the ferrite bond magnet 22 having a predetermined shape is formed while orienting the raw material of the ferrite bond magnet 22.
- step ST12 for example, the ferrite bond magnet 22 is formed while orienting the raw material of the ferrite bond magnet 22 in a state where an extremely anisotropic magnetic field is generated inside the second mold using an orientation magnet. do. As a result, the ferrite bond magnet 22 having polar anisotropy is formed.
- step ST13 the molded ferrite bond magnet 22 is cooled.
- step ST14 the ferrite bond magnet 22 is taken out from the second mold.
- step ST15 the removed ferrite bond magnet 22 is demagnetized.
- step ST16 the ferrite bond magnet 22 is arranged inside the first mold for injection molding the rare earth bond magnet 21.
- the raw materials of the rare earth bond magnet 21 are filled into the plurality of groove portions 22f of the ferrite bond magnet 22 arranged in the first mold.
- the rare earth bond magnet 21 is formed by, for example, injection molding.
- the rare earth bond magnet 21 is not limited to injection molding and may be molded by another molding method such as pressure molding.
- step ST18 the rare earth bond magnet 21 having a predetermined shape is formed while orienting the raw material of the rare earth bond magnet 21.
- step ST18 for example, the rare earth bond magnet 21 is placed while orienting the raw material of the rare earth bond magnet 21 in a state where a very different magnetic field is generated inside the first mold using a magnet for light distribution. Mold.
- the rare earth bond magnet 21 having a plurality of rare earth bond magnets 21 having polar anisotropy is formed. That is, the rotor body 11 in which the rare earth bond magnet 21 and the ferrite bond magnet 22 are integrally molded is formed.
- the rare earth bond magnet 21 and the ferrite bond magnet 22 are integrally molded, two bond magnets of different types are fused.
- the first overhanging portion 42 of the rare earth bond magnet 21 is fixed to the + z-axis side end portion 22c of the ferrite bond magnet 22, and the second overhanging portion 43 is the ⁇ z-axis side end portion of the ferrite bond magnet 22. It is fixed at 22d.
- step ST19 the formed rotor body 11 is cooled.
- step ST20 the rotor body 11 is taken out from the first mold.
- step ST21 the removed rotor body 11 is demagnetized.
- FIG. 9 is a plan view showing the configuration of the rotor main body 111 according to the comparative example.
- the annular rare earth bond magnet 121 is arranged outside the annular ferrite bond magnet 122. That is, in the rotor main body 111 according to the comparative example, the entire outer peripheral surface of the rotor main body 111 is formed by the outer peripheral surface 121a of the rare earth bond magnet 121.
- the outer peripheral surface 11a of the rotor main body 11 is formed by the outer peripheral surface 22e of the ferrite bond magnet 22 and the outer peripheral surface 21c of the rare earth bond magnet 21.
- the amount of the rare earth bond magnet 21 can be reduced as compared with the rotor main body 111 according to the comparative example.
- the amount of the rare earth bond magnet 21 can be reduced by about 20% as compared with the rotor 1 according to the comparative example.
- the rare earth bond magnet 21 is more expensive than the ferrite bond magnet 22.
- the material unit price of a rare earth bond magnet is 10 times or more the material unit price of a ferrite bond magnet. Therefore, the manufacturing cost of the rotor main body 11 according to the first embodiment can be reduced.
- FIG. 10 is a graph showing the distribution of the surface magnetic flux density of the rotor main body 11 according to the first embodiment and the distribution of the surface magnetic flux density of the rotor main body 111 according to the comparative example.
- the horizontal axis represents the position [degree] of the circumferential direction R1 on the outer peripheral surface of the rotor main body 11 or the outer peripheral surface of the rotor main body 111
- the vertical axis represents the surface magnetic flux density [a. u. ] Is shown.
- the solid line shows the distribution of the surface magnetic flux density of the rotor main body 11 according to the first embodiment
- the broken line shows the distribution of the surface magnetic flux density of the rotor main body 111 according to the comparative example.
- the distribution of the surface magnetic flux density of the rotor main body 111 according to the comparative example is represented by the uniform sinusoidal waveform S1.
- the distribution of the surface magnetic flux density of the rotor main body 11 according to the first embodiment is also represented by a substantially uniform sine wave waveform S2. That is, as compared with the rotor main body 111 according to the comparative example, the rotor main body 11 according to the first embodiment also suppresses a rapid change in the surface magnetic flux density in the circumferential direction R1.
- the same magnetic flux density as that of the rotor main body 111 according to the comparative example can be obtained, but the interpole portion (inter-pole portion).
- the rotor body 11 according to the first embodiment is provided with a plurality of rare earth bond magnets 21 even if the amount of the ferrite bond magnets 22 is smaller than that of the rotor body 111 according to the comparative example. , The decrease in magnetic flux density can be compensated. As a result, the rotor main body 11 according to the first embodiment can obtain an induced voltage equivalent to that of the rotor main body 111 according to the comparative example.
- the first overhanging portion 42 of the rare earth bond magnet 21 and the end portion 22c on the + z axis side of the ferrite bond magnet 22 are joined. ..
- the bonding area between the rare earth bond magnet 21 and the ferrite bond magnet 22 increases, so that the rare earth bond magnet 21 can be prevented from falling off from the ferrite bond magnet 22.
- the second overhanging portion 43 of the rare earth bond magnet 21 and the end portion 22d on the ⁇ z axis side of the ferrite bond magnet 22 are joined.
- the bonding area between the rare earth bond magnet 21 and the ferrite bond magnet 22 is further increased, so that the rare earth bond magnet 21 is more difficult to fall off from the ferrite bond magnet 22.
- the ferrite bond magnet 22 supported by the shaft 10 has polar anisotropy. As a result, it is not necessary to arrange the rotor core forming the magnetic path inside the ferrite bond magnet 22 in the radial direction, so that the number of parts in the rotor 1 can be reduced and the weight of the rotor 1 can be reduced. Can be done.
- the outer peripheral surface of the rotor main body 11 is formed by the outer peripheral surface 22e of the ferrite bond magnet 22 and the outer peripheral surface 21c of the rare earth bond magnet 21.
- the rare earth bond magnet 21 is more expensive than the ferrite bond magnet 22.
- the amount of the rare earth bond magnet 21 can be reduced, so that the manufacturing cost of the rotor 1 can be reduced.
- the rotor 1 according to the first embodiment even when the amount of the rare earth bond magnet 21 is reduced, a sudden change in the surface magnetic flux density of the rotor main body 11 is suppressed, so that the rotor In No. 1, an induced voltage equivalent to that of the rotor according to the comparative example can be obtained. Therefore, the rotor 1 according to the first embodiment can obtain the same rotation control accuracy as the rotor 1 according to the comparative example.
- FIG. 11 is a partial cross-sectional view showing the configuration of the rotor main body 211 of the rotor according to the second embodiment.
- the same or corresponding components as those shown in FIG. 6 are designated by the same reference numerals as those in FIG.
- the rotor main body 211 according to the second embodiment is different from the rotor main body 111 according to the first embodiment in that an overhanging portion is fitted in a concave portion formed in the ferrite bond magnet 222.
- the rotor main body 211 has a rare earth bond magnet 221 and a ferrite bond magnet 222.
- the ferrite bond magnet 222 has a first recess 222h formed at the end 222c on the + z-axis side and a second recess 222i formed at the end 222d on the ⁇ z-axis side.
- the ferrite bond magnet 222 may have only one of the first recess 222h and the second recess 222i. Further, the ferrite bond magnet 222 may have a plurality of first recesses 222h or a plurality of second recesses 222i.
- the rare earth bond magnet 221 has a pillar portion 41, a first overhanging portion 242, and a second overhanging portion 243.
- the first overhanging portion 242 has a convex portion 242b as a first fitting portion.
- the convex portion 242b projects from the end surface 242c on the ⁇ z axis side of the first overhanging portion 242 toward the ferrite bond magnet 222.
- the convex portion 242b is fitted in the first concave portion 222h.
- the second overhanging portion 243 has a convex portion 243b as a second fitting portion.
- the convex portion 243b projects from the end surface 243c on the + z-axis side of the second overhanging portion 243 toward the ferrite bond magnet 222.
- the convex portion 243b is fitted in the second concave portion 222i.
- the axial length L1 between the + z-axis side end 222c and the ⁇ z-axis side end 222d is the bottom surface 222j of the first recess 222h and the bottom surface 222k of the second recess 222i.
- the convex portion 242b of the first overhanging portion 242 is fitted into the first concave portion 222h. This makes it more difficult for the rare earth bond magnet 221 to fall off from the ferrite bond magnet 222.
- the convex portion 243b of the second overhanging portion 243 is fitted into the second concave portion 222i. This makes it more difficult for the rare earth bond magnet 221 to fall off from the ferrite bond magnet 222.
- FIG. 12 is a partial cross-sectional view showing the configuration of the rotor main body 211A of the rotor according to the modified example of the second embodiment.
- components that are the same as or correspond to the components shown in FIG. 11 are designated by the same reference numerals as those shown in FIG.
- the rotor main body 211A according to the modified example of the second embodiment is different from the rotor main body 111 according to the first embodiment in that the overhanging portion is fitted to the convex portion formed on the ferrite bond magnet 222A. ..
- the rotor main body 211A has a rare earth bond magnet 221A and a ferrite bond magnet 222A.
- the ferrite bond magnet 222A has a first convex portion 222m formed on the end portion 222c on the + z-axis side and a second convex portion 222n formed on the end portion 222d on the ⁇ z-axis side.
- the surface 222u on the + z-axis side of the first convex portion 222m is flush with the surface on the + z-axis side of the ferrite bond magnet 722A.
- the surface 222v on the ⁇ z axis side of the second convex portion 222n is flush with the surface on the ⁇ z axis side of the ferrite bond magnet 722A.
- the ferrite bond magnet 222A may have only one of the first convex portion 222m and the second convex portion 222n. Further, the ferrite bond magnet 222A may have a plurality of first convex portions 222m or a plurality of second convex portions 222n.
- the rare earth bond magnet 221A has a pillar portion 41, a first overhanging portion 242A, and a second overhanging portion 243A.
- the first overhanging portion 242A has a through hole 242e as a first fitting portion.
- the through hole 242e is fitted in the first convex portion 222m.
- the first overhanging portion 242A is not limited to the through hole 242e, and may have a recess that fits into the first convex portion 222m.
- the second overhanging portion 243A has a through hole 243e as a second fitting portion.
- the through hole 243e is fitted in the second convex portion 222n.
- the second overhanging portion 243A is not limited to the through hole 243e, and may have a recess that fits into the second convex portion 222n.
- the axial length L1 between the end portion 222c on the + z-axis side and the end portion 222d on the ⁇ z-axis side is the surface 222u on the + z-axis side of the first convex portion 222m and the second surface 222u on the + z-axis side. It is smaller than the axial length L3 between the convex portion 222n and the surface 222v on the ⁇ z axis side.
- the through hole 242e of the first overhanging portion 242A is fitted to the first convex portion 221g of the ferrite bond magnet 222. This makes it more difficult for the rare earth bond magnet 221 to fall off from the ferrite bond magnet 222.
- the through hole 243e of the second overhanging portion 243A is fitted to the second convex portion 221h of the ferrite bond magnet 222. This makes it more difficult for the rare earth bond magnet 221 to fall off from the ferrite bond magnet 222.
- the first overhanging portion 242A and the second overhanging portion 243A have through holes 242e and 243e.
- the amount of the rare earth bond magnet 221A in the rotor main body 211A is reduced, so that the manufacturing cost of the rotor can be reduced.
- FIG. 13 is a cross-sectional view showing the configuration of the rotor main body 311 of the rotor according to the third embodiment.
- the same or corresponding components as those shown in FIG. 6 are designated by the same reference numerals as those shown in FIG.
- the rotor main body 311 according to the third embodiment is different from the rotor main body 111 according to the first embodiment in that a step portion is formed in the ferrite bond magnet 322.
- the rotor main body 311 of the rotor has a rare earth bond magnet 321 and a ferrite bond magnet 322.
- the ferrite bond magnet 322 has a first step portion 322p formed at the end portion 322c on the + z axis side and a second step portion 322q formed at the end portion 322d on the ⁇ z axis side.
- the first step portion 322p is recessed in the ⁇ z axis direction from the end portion 322c on the + z axis side.
- the second step portion 322q is recessed in the + z axis direction from the end portion 322d on the ⁇ z axis side.
- the ferrite bond magnet 322 may have only one of the first step portion 322p and the second step portion 322q.
- the rare earth bond magnet 321 has a pillar portion 341, a first overhanging portion 342, and a second overhanging portion 343.
- the axial length L341 of the column portion 341 is equal to the axial length L22 of the ferrite bond magnet 322.
- the first overhanging portion 342 is joined to the bottom surface 322r of the first stepped portion 322p.
- the second overhanging portion 343 is joined to the bottom surface 322s of the second stepped portion 322q.
- FIG. 14 is a plan view showing the configuration of the ferrite bond magnet 322 according to the third embodiment.
- components that are the same as or correspond to the components shown in FIG. 4 are designated by the same reference numerals as those shown in FIG.
- the ferrite bond magnet 322 has a plurality of first stepped portions 322p arranged at intervals in the circumferential direction R1.
- the first step portion 322p is located radially inside the groove portion 22f.
- the width of the first step portion 322p in the circumferential direction R1 becomes narrower toward the inner side in the radial direction.
- the shape of the first step portion 322p when viewed in the ⁇ z axis direction is substantially a triangle. That is, the shape of the first step portion 322p is the same as the shape of the first overhanging portion 342. In other words, the shape of the first step portion 322p corresponds to the shape of the first overhanging portion 342.
- the shape of the second step portion 322q (see FIG. 12) when viewed in the ⁇ z axis direction is the same as the shape of the second overhanging portion 343.
- the first overhanging portion 342 of the rare earth bond magnet 321 is joined to the bottom surface 322r of the first stepped portion 322p formed on the ferrite bond magnet 322. There is. This makes it possible to prevent the rare earth bond magnet 321 from falling off from the ferrite bond magnet 322.
- the second overhanging portion 343 of the rare earth bond magnet 321 is joined to the bottom surface 322s of the second step portion 322q formed on the ferrite bond magnet 322. This makes it more difficult for the rare earth bond magnet 321 to fall off from the ferrite bond magnet 322.
- the axial length L341 of the pillar portion 341 of the rare earth bond magnet 321 is equal to the axial length L22 of the ferrite bond magnet 322.
- the amount of the rare earth bond magnet 321 can be reduced, so that the manufacturing cost of the rotor can be reduced.
- FIG. 15 is a partial cross-sectional view showing the configuration of the rotor main body 311A of the rotor according to the first modification of the third embodiment.
- components that are the same as or correspond to the components shown in FIGS. 11 and 13 are designated by the same reference numerals as those shown in FIGS. 11 and 13.
- the rotor main body 311 according to the first modification of the third embodiment is the rotor main body 311 according to the third embodiment in that the overhanging portion is fitted in the recess formed in the stepped portion of the ferrite bond magnet 322A. Is different from.
- the rotor main body 311A has a rare earth bond magnet 321A and a ferrite bond magnet 322A.
- the ferrite bond magnet 322A has a first recess 322h formed on the bottom surface 322r of the first step portion 322p and a second recess 322i formed on the bottom surface 322s of the second step portion 322q. ..
- the ferrite bond magnet 322A may have one of the first recess 322h and the second recess 322i. Further, the ferrite bond magnet 322A may have a plurality of first recesses 322h or a plurality of second recesses 322i.
- the rare earth bond magnet 321A has a pillar portion 341, a first overhanging portion 342A, and a second overhanging portion 343A.
- the first overhanging portion 342A has a convex portion 42b as a first fitting portion.
- the convex portion 42b is fitted in the first concave portion 322h.
- the second overhanging portion 343A has a convex portion 43b as a second fitting portion.
- the convex portion 43b is fitted in the second concave portion 322i.
- the axial length L4 between the bottom surface 322r of the first step portion 322p and the bottom surface 322s of the second step portion 322q is the bottom surface of the first recess 322h and the second recess 322i. It is larger than the axial length L5 between it and the bottom surface.
- the convex portion 42b of the first overhanging portion 342A is formed on the first stepped portion 322p of the ferrite bond magnet 322A. It is fitted in the recess 322h. This makes it more difficult for the rare earth bond magnet 321A to fall off from the ferrite bond magnet 322A.
- the convex portion 43b of the second overhanging portion 343A is formed in the second stepped portion 322q of the ferrite bond magnet 322A, and the second concave portion 322i is formed. Fitted in. This makes it more difficult for the rare earth bond magnet 321A to fall off from the ferrite bond magnet 322A.
- FIG. 16 is a partial cross-sectional view showing the configuration of the rotor main body 311B of the rotor according to the second modification of the third embodiment.
- components that are the same as or correspond to the components shown in FIGS. 12 and 13 are designated by the same reference numerals as those shown in FIGS. 12 and 13.
- the overhanging portion is fitted to the convex portion formed in the stepped portion of the ferrite bond magnet 322B, and the rotor main body according to the third embodiment is fitted. Different from 311.
- the rotor main body 311B has a rare earth bond magnet 321B and a ferrite bond magnet 322B.
- the ferrite bond magnet 322B has a first convex portion 322m protruding from the bottom surface 322r of the first step portion 322p toward the + z axis side and a second convex portion 322m protruding from the bottom surface 322s of the second step portion 322q toward the ⁇ z axis side. It has a convex portion 322n.
- the surface 322u on the + z-axis side of the first convex portion 322m is flush with the surface on the + z-axis side of the ferrite bond magnet 322B.
- the surface 322v of the second convex portion 322n on the ⁇ z axis side is flush with the surface of the ferrite bond magnet 322B on the ⁇ z axis side.
- the ferrite bond magnet 322B may have only one of the first convex portion 322m and the second convex portion 322n. Further, the ferrite bond magnet 322B may have a plurality of first convex portions 322m or a plurality of second convex portions 322n.
- the ferrite bond magnet 322B has a pillar portion 341, a first overhanging portion 342B, and a second overhanging portion 343B.
- the first overhanging portion 342B has a through hole 342e as a first fitting portion.
- the through hole 342e is fitted in the first convex portion 322m.
- the second overhanging portion 343B has a through hole 343e as a second fitting portion.
- the through hole 343e is fitted in the second convex portion 322n.
- the axial length L4 between the bottom surface 322r of the first step portion 322p and the bottom surface 322s of the second step portion 322q is the surface 322u on the + z axis side of the first convex portion 322m. It is smaller than the axial length L6 between the second convex portion 322n and the surface 322v on the ⁇ z axis side.
- the through hole 342e of the first overhanging portion 342B is formed in the first stepped portion 322p of the ferrite bond magnet 322B.
- the convex portion 322m is fitted. This makes it more difficult for the rare earth bond magnet 321B to fall off from the ferrite bond magnet 322B.
- the through hole 342e of the second overhanging portion 343B is formed in the second stepped portion 322q of the ferrite bond magnet 322B. 322n is fitted. This makes it more difficult for the rare earth bond magnet 321B to fall off from the ferrite bond magnet 322B.
- FIG. 17A is an enlarged plan view showing the configuration of the rotor main body 411 of the rotor according to the fourth embodiment.
- FIG. 17B is an enlarged bottom view showing the configuration of the rotor main body 411 of the rotor according to the fourth embodiment.
- the same or corresponding components as those shown in FIG. 4 are designated by the same reference numerals as those shown in FIG.
- the rotor main body 411 according to the fourth embodiment is different from the rotor main body 111 according to the first embodiment in the shape of the overhanging portion.
- the rotor main body 411 of the rotor has a rare earth bond magnet 421 and a ferrite bond magnet 22.
- the rare earth bond magnet 421 has a diameter from the pillar 41, the first overhang 442 extending radially inward from the + z-axis end 41a of the pillar 41, and the ⁇ z-axis end 41b of the pillar 41. It has a second overhanging portion 443 extending inward in the direction.
- the length A1 of the first overhanging portion 442 in the circumferential direction R1 is longer than the length A2 of the end portion 41a on the + z axis side of the pillar portion 41 in the circumferential direction R1.
- the length A3 of the second overhanging portion 443 in the circumferential direction R1 is longer than the length A4 of the end portion 41b on the ⁇ z axis side of the pillar portion 41 in the circumferential direction R1.
- the "length of the circumferential direction R1 of the first overhanging portion 442 (or the second overhanging portion 443) is defined as the axis C1 in the first overhanging portion 442 (or the second overhanging portion 443). It is the length of a straight line extending in a direction perpendicular to the straight line M connecting the first overhanging portion 442. Further, “the length of the end portion 41a on the + z-axis side (or the end portion 41b on the -z-axis side) in the circumferential direction” means the end portion 41a on the + z-axis side (or the end portion 41b on the -z-axis side). Is the length of the straight line having the shortest distance among the straight lines extending in the direction perpendicular to the straight line M connecting the axis C1 and the pillar portion 41.
- the length A3 of the second overhanging portion 443 is the same as the length A1 of the first overhanging portion 442. Further, in the pillar portion 41, the length A4 of the end portion 41b on the ⁇ z axis side is the same as the length A2 of the end portion 41a on the + z axis side.
- the length A1 in the circumferential direction R1 of the first overhanging portion 442 is the length R1 in the circumferential direction of the end portion 41a on the + z axis side of the pillar portion 41. Longer than A2. As a result, the bonding area between the first overhanging portion 442 and the end portion 22c on the + z-axis side of the ferrite bond magnet 22 increases, so that the rare earth bond magnet 421 is more difficult to fall off from the ferrite bond magnet 22.
- the length A3 in the circumferential direction R1 of the second overhanging portion 443 is the length A4 in the circumferential direction R1 of the end portion 41b on the ⁇ z axis side of the pillar portion 41. Longer. As a result, the bonding area between the second overhanging portion 443 and the end portion 22d on the ⁇ z axis side of the ferrite bond magnet 22 increases, so that the rare earth bond magnet 421 is more difficult to fall off from the ferrite bond magnet 22.
- FIG. 18 is a side view showing the configuration of the rotor main body 411A of the rotor according to the first modification of the fourth embodiment.
- FIG. 19A is an enlarged plan view showing the configuration of the rotor main body 411A of the rotor according to the fourth embodiment.
- FIG. 19B is an enlarged bottom view showing the configuration of the rotor main body 411A of the rotor according to the fourth embodiment.
- the rotor main body 411A according to the first modification of the fourth embodiment is different from the rotor main body 411 according to the fourth embodiment in the shape of the second overhanging portion.
- the rotor main body 411A has a plurality of rare earth bond magnets 421A and a ferrite bond magnet 422A.
- the rare earth bond magnet 421A includes a pillar portion 41 and a first overhanging portion 442A extending radially inward from the end portion 41a on the + z axis side of the pillar portion 41. It has a second overhanging portion 443A extending inward in the radial direction from the end portion 41b on the ⁇ z axis side of the pillar portion 41.
- the length A13 of the second overhanging portion 443A is different from the length A1 of the first overhanging portion 442A. Specifically, the length A13 of the second overhanging portion 443A is longer than the length A1 of the first overhanging portion 442. That is, in the modified example of the fourth embodiment, the shapes of the first overhanging portion 442 and the second overhanging portion 443 are different from each other. The length A13 may be shorter than the length A1.
- the length A14 of the end portion 41b on the ⁇ z axis side is different from the length A2 of the end portion 41a on the + z axis side. That is, in the rare earth bond magnet 421, the length of the circumferential direction R1 of the overhanging portions on both sides in the axial direction is non-uniform. Specifically, in the pillar portion 41, the length A14 of the end portion 41b on the ⁇ z axis side is longer than the length A2 of the end portion 41a on the + z axis side. The length A14 may be shorter than the length A2.
- the length A13 of the second overhanging portion 443A is different from the length A1 of the first overhanging portion 442A.
- the expansion amount (or contraction amount) of the first overhanging portion 442A and the expansion amount (or contraction amount) of the second overhanging portion 443A are different.
- the force for fixing the rare earth bond magnet 421A to the ferrite bond magnet 422A is strengthened, so that the rare earth bond magnet 421A is more difficult to fall off from the ferrite bond magnet 422A.
- FIG. 20A is an enlarged plan view showing the configuration of the rotor main body 411B of the rotor according to the second modification of the fourth embodiment.
- components that are the same as or correspond to the components shown in FIG. 4 are designated by the same reference numerals as those shown in FIG.
- the rotor main body 411A according to the modified example of the fourth embodiment is different from the rotor main body 11 according to the first embodiment in the shape of the overhanging portion.
- the rotor main body 411B has a rare earth bond magnet 421B and a ferrite bond magnet 422B.
- the rare earth bond magnet 421B has a pillar portion 41 and a first overhanging portion 442B extending radially inward from the end portion 41a on the + z axis side of the pillar portion 41.
- the first overhanging portion 442B extends from the end portion 41a on the + z-axis side of the pillar portion 41 toward one side of the circumferential direction R1 and the first portion 442e, and from the end portion 41a on the + z-axis side to the other end portion 41a in the circumferential direction. It has a second portion 442f extending towards it.
- the first portion 442e and the second portion 442f are extended so that the distance between the first portion 442e and the second portion 442f in the circumferential direction R1 becomes large. There is.
- the length of the first overhanging portion 442B in the circumferential direction R1 is longer than the length A2 of the end portion 41a on the + z axis side of the pillar portion 41 in the circumferential direction R1 (see FIG. 17).
- An end portion 422c of the ferrite bond magnet 422B on the + z axis side is arranged between the first portion 442e and the second portion 442f.
- FIG. 20 (B) is a cross-sectional view of the rotor main body 411B shown in FIG. 20 (A) cut along the line A20-A20.
- components that are the same as or correspond to the components shown in FIG. 15 are designated by the same reference numerals as those shown in FIG.
- the first portion 442e has a convex portion 442g as a fitting portion.
- the convex portion 442g is fitted in the concave portion 422h formed in the stepped portion 422p of the ferrite bond magnet 422B.
- the second portion 442f has a convex portion 442h as a fitting portion.
- the convex portion 442h is fitted in a concave portion (not shown) formed in the ferrite bond magnet 422B.
- the first portion 442e and the second portion 442f may have a fitting portion (for example, a through hole or a concave portion) that fits with the convex portion formed on the ferrite bond magnet 422B.
- the distance r1 is Longer than the distance r2.
- the first overhanging portion 442B is the first portion 442e extending from the end portion 41a on the + z axis side of the pillar portion 41 to both sides in the circumferential direction.
- a second portion 442f, and a ferrite bond magnet 422B is arranged between the first portion 442e and the second portion 442f.
- FIG. 21 is a plan view showing the configuration of the rotor main body 511 of the rotor according to the fifth embodiment.
- FIG. 22 is a cross-sectional view of the rotor body 511 shown in FIG. 21 cut along the line A22-A22.
- the same or corresponding components as those shown in FIGS. 1 and 6 are designated by the same reference numerals as those shown in FIGS. 1 and 6.
- the rotor main body 511 according to the fifth embodiment is different from the rotor main body 11 according to the first embodiment in that the rare earth bond magnet 521 is configured.
- the rotor body 511 has a rare earth bond magnet 521 and a ferrite bond magnet 522.
- the rare earth bond magnet 521 has a plurality of pillar portions 41 arranged at intervals in the circumferential direction R1, and ring portions 551 and 552 located radially inside the plurality of pillar portions 41.
- the ring portion 551 is joined to the end portion 22c on the + z axis side of the ferrite bond magnet 522.
- the ring portion 551 is composed of a plurality of first overhanging portions 42 and a connecting portion 44 connecting a plurality of first overhanging portions 42 adjacent to each other in the circumferential direction.
- the ring portion 552 is joined to the end portion 22d on the ⁇ z axis side of the ferrite bond magnet 522.
- the ring portion 552 is composed of a plurality of first overhanging portions 42 and a connecting portion (not shown) connecting the plurality of second overhanging portions 43 adjacent in the circumferential direction.
- the rare earth bond magnet 521 may have only one of the ring portion 551 on the + z-axis side and the ring portion 552 on the ⁇ z-axis side.
- the rare earth bond magnet 521 has a ring portion 551 including a connecting portion 44 for connecting a plurality of first overhanging portions 42 adjacent to the circumferential direction R1. ing. This makes it more difficult for the rare earth bond magnet 521 to fall off from the ferrite bond magnet 522.
- the rare earth bond magnet 521 further has a ring portion 552 including a connecting portion for connecting a plurality of second overhanging portions 43 adjacent to the circumferential direction R1. .. This makes it more difficult for the rare earth bond magnet 521 to fall off from the ferrite bond magnet 522.
- FIG. 23 is a cross-sectional view showing the configuration of the rotor main body 511A of the rotor according to the modified example of the fifth embodiment.
- FIG. 24 is a plan view showing the configuration of the ferrite bond magnet 522A according to the modified example of the fifth embodiment.
- components that are the same as or correspond to the components shown in FIGS. 21 and 22 are designated by the same reference numerals as those shown in FIGS. 21 and 22.
- the rotor main body 511A according to the modified example of the fifth embodiment is different from the rotor main body 511 according to the fifth embodiment in that the ring portions 551 and 552 are arranged in the annular recesses 522r and 522s of the ferrite bond magnet 522A. It's different.
- the rotor main body 511A has a rare earth bond magnet 521A and a ferrite bond magnet 522A.
- the ring portion 551 of the rare earth bond magnet 521 is arranged in the annular recess 522r as a recess formed in the end portion 22c on the + z axis side of the ferrite bond magnet 522.
- the end face of the ring portion 551 on the + z-axis side is flush with the end face of the ferrite bond magnet 522A on the + z-axis side.
- the ring portion 552 is arranged in the annular recess 522s formed at the end portion 22d on the ⁇ z axis side of the ferrite bond magnet 522.
- the end face of the ring portion 552 on the ⁇ z axis side is flush with the end face of the ferrite bond magnet 522A on the ⁇ z axis side.
- the annular recess 522r is located radially inside the groove 22f at the + z-axis end 22c of the ferrite bond magnet 522.
- the shape of the annular recess 522r when viewed in the ⁇ z axis direction is an annular shape centered on the axis C1.
- the ferrite bond magnet 522A has an annular recess 522r and 522s in which the ring portions 551 and 552 are arranged. As a result, the amount of the rare earth bond magnet 521A in the rotor body 511A is reduced, so that the manufacturing cost of the rotor can be reduced.
- FIG. 25 is a plan view showing the configuration of the rotor 6 according to the sixth embodiment.
- FIG. 26 is a cross-sectional view of the rotor 6 shown in FIG. 25 cut along the line A26-A26.
- the same or corresponding components as those shown in FIG. 13 are designated by the same reference numerals as those shown in FIG.
- the rotor 6 according to the sixth embodiment is different from the rotor according to any one of the first to fifth embodiments in that it further includes the ring members 661 and 662. Note that, in FIGS. 25 and 26, the rotor 6 will be described with reference to an example in which the rotor 6 has the rotor main body 311 according to the third embodiment.
- the rotor 6 has a shaft 10, a rotor main body 311 and a connecting portion 12, and ring members 661 and 662.
- the ring members 661 and 662 are annular members centered on the axis C1, respectively.
- the ring members 661 and 662 are formed of, for example, a resin such as an unsaturated polyester resin.
- the ring member 661 is located on the + z-axis side of the rotor body 311.
- the ring member 661 is fixed to the + z-axis side end surface 342f of the first overhanging portion 342 and the + z-axis side end 322c of the ferrite bond magnet 322. That is, when the rotor 6 is viewed in the ⁇ z axis direction, the ring member 662 is arranged at a position where it overlaps the boundary surface between the first overhanging portion 342 and the ferrite bond magnet 322.
- the ring member 662 is located on the -z axis side of the rotor body 311.
- the ring member 662 is fixed to the end surface 343f on the ⁇ z axis side of the second overhanging portion 343 and the end portion 322d on the ⁇ z axis side of the ferrite bond magnet 22. That is, when the rotor 6 is viewed in the + z-axis direction, the ring member 662 is arranged at a position where it overlaps the boundary surface between the second overhanging portion 343 and the ferrite bond magnet 322.
- the rotor 6 may have only one of the ring member 661 on the + z-axis side and the ring member 662 on the ⁇ z-axis side.
- the ring member 661 is fixed to the first overhanging portion 342 and the ferrite bond magnet 322 on the + z-axis side of the rotor main body 311. This makes it more difficult for the rare earth bond magnet 321 to fall off from the ferrite bond magnet 322.
- the ring member 662 is fixed to the second overhanging portion 343 and the ferrite bond magnet 322 on the ⁇ z axis side of the rotor main body 311. This makes it more difficult for the rare earth bond magnet 321 to fall off from the ferrite bond magnet 322.
- FIG. 27 is a plan view showing the configuration of the rotor 6A according to the modified example of the sixth embodiment.
- FIG. 27 is a cross-sectional view of the rotor 6A shown in FIG. 28 cut along the line A28-A28.
- the rotor 6A according to the modified example of the sixth embodiment is different from the rotor 6 according to the sixth embodiment in that the ring members 661 and 662 are integrated with the connecting portion 12.
- the rotor 6A includes a shaft 10, a rotor body 311 and ring members 661 and 662 as a first resin portion, and a connecting portion 12 as a second resin portion. have.
- the ring members 661 and 662 are integrally molded with the connecting portion 12, so that the ring members 661 and 662 are connected to the connecting portion 12.
- the ring members 661 and 662 are connected to the rib 12c of the connecting portion 12. That is, in the modified example of the sixth embodiment, the shaft 10 and the rotor main body 311 are connected via the connecting portion 12 and the ring members 661 and 662.
- the ring members 661 and 662 are connected to the connecting portion 12.
- the ring members 661 and 662 can also be molded at the same time, thus reducing the manufacturing process of the rotor 6. be able to.
- the natural frequency of the rotor 6A changes depending on the rigidity of the rotor 6A.
- the rigidity of the rotor 6A can be adjusted by changing the width, length and number of ribs 12c.
- the rib 12c is connected to the ring members 661 and 662, the length of the rib is long. Therefore, the rigidity of the rotor 6A changes, and the natural frequency of the rotor 6A changes. As a result, the occurrence of resonance can be suppressed, and the vibration characteristics of the rotor 6A can be adjusted.
- the moment of inertia of the rotor 6A changes depending on the mass of the rotor 6A.
- the mass of the rotor 6A can be adjusted by changing the width, length and number of ribs 12c.
- the larger the moment of inertia the larger the starting torque is required, but the rotation of the rotor 1 can be stabilized.
- the rib 12c is connected to the ring members 661 and 662 to change the shape of the rib 12c and adjust the natural frequency and moment of inertia of the rotor 6A. can.
- the natural frequency and moment of inertia of the rotor 6A may be changed depending on the number of ribs 12c.
- FIG. 29 is a side view showing the configuration of the rotor main body 711 of the rotor according to the seventh embodiment.
- FIG. 30 is a cross-sectional view showing the configuration of the rotor main body 711 according to the seventh embodiment.
- the rotor main body 711 according to the seventh embodiment is different from any of the rotor main bodies of the first to sixth embodiments in that the overhanging portion is provided on the ferrite bond magnet 721.
- the rotor main body 711 has a ferrite bond magnet 721 as a first permanent magnet and a plurality of rare earth bond magnets 722 as a second permanent magnet.
- the plurality of rare earth bond magnets 722 are arranged at intervals in the circumferential direction R1.
- the ferrite bond magnet 721 has a cylindrical portion 71, a first overhanging portion 72, and a second overhanging portion 73.
- the cylindrical portion 71 is supported by the shaft 10 (see FIG. 1) via the connecting portion 12 (see FIG. 1).
- the axial length L71 of the cylindrical portion 71 is longer than the axial length L72 of the rare earth bond magnet 722.
- the first overhanging portion 72 extends radially outward from the end portion 71a on the + z-axis side of the cylindrical portion 71.
- the first overhanging portion 72 is in contact with the + z-axis side end portion 722c of the rare earth bond magnet 722.
- the second overhanging portion 73 extends radially outward from the end portion 71b of the cylindrical portion 71 on the ⁇ z axis side.
- the second overhanging portion 73 is in contact with the end portion 722d on the ⁇ z axis side of the rare earth bond magnet 722.
- the radial inner end of the first overhang 72 and the radial inner end of the second overhang 73 are flush with the outer peripheral surface of the rare earth bond magnet 722.
- the cylindrical portion 71 and the rare earth bond magnet 722 are joined by integrally molding the ferrite bond magnet 721 and the rare earth bond magnet 722.
- the ferrite bond magnet 721 and the rare earth bond magnet 722 are integrally molded by molding the ferrite bond magnet 721 with the previously manufactured rare earth bond magnet 722 placed in the mold. The ferrite bond magnet 721 and the rare earth bond magnet 722 are integrated.
- the first overhanging portion 72 and the end portion 722c on the + z-axis side of the rare earth bond magnet 722 are joined, and the second overhanging portion 73 and the rare earth bond magnet 722 on the ⁇ z-axis side are joined. It is joined to the end 722d.
- the bonding area between the ferrite bond magnet 721 and the rare earth bond magnet 722 can be increased. .. Therefore, it is possible to prevent the rare earth bond magnet 722 from falling off from the ferrite bond magnet 721.
- FIG. 31 is a flowchart showing a process of forming the rotor main body 711.
- step ST71 the raw material of the rare earth bond magnet 722 is filled inside the first mold for injection molding the rare earth bond magnet 722.
- step ST72 the rare earth bond magnet 722 having a predetermined shape is formed while orienting the raw material of the rare earth bond magnet 722.
- step ST72 for example, the rare earth bond magnet 722 is formed while orienting the raw material of the rare earth bond magnet 722 in a state where a very different magnetic field is generated inside the first mold using an orientation magnet. do. As a result, a rare earth bond magnet 722 with polar anisotropy orientation is formed.
- step ST73 the molded rare earth bond magnet 722 is cooled.
- step ST74 the rare earth bond magnet 722 is taken out from the inside of the first mold.
- step ST75 the taken-out rare earth bond magnet 722 is demagnetized.
- step ST76 the rare earth bond magnet 722 is placed inside the second mold.
- step ST77 the raw material of the ferrite bond magnet 721 is filled inside the second mold.
- step ST78 the ferrite bond magnet 721 having a predetermined shape is formed while orienting the raw material of the ferrite bond magnet 721.
- step ST78 for example, the ferrite bond magnet 721 is formed while orienting the raw material of the ferrite bond magnet 721 in a state where an extremely anisotropic magnetic field is generated inside the second mold using an orientation magnet. do.
- Steps ST79 to ST81 are the same as steps ST19 to ST21 shown in FIG.
- the first overhanging portion 72 of the ferrite bond magnet 721 is joined to the end portion 722c on the + z axis side of the rare earth bond magnet 722.
- the bonding area between the rare earth bond magnet 722 and the ferrite bond magnet 721 increases, so that the rare earth bond magnet 722 can be prevented from falling off from the ferrite bond magnet 721.
- the second overhanging portion 73 of the ferrite bond magnet 721 is joined to the end portion 722d on the ⁇ z axis side of the rare earth bond magnet 722.
- the bonding area between the rare earth bond magnet 722 and the ferrite bond magnet 721 is further increased, so that the rare earth bond magnet 722 is more difficult to fall off from the ferrite bond magnet 721.
- the overhanging portion (that is, the first overhanging portion 72 and the second overhanging portion 73) for preventing the rare earth bond magnet 722 from falling off is provided in the ferrite bond magnet 721.
- the axial length of the rare earth bond magnet 722 is reduced as compared with the axial length of the rare earth bond magnet 21 according to the first embodiment, so that the amount of the rare earth bond magnet 722 can be reduced. Therefore, the manufacturing cost of the rotor can be reduced.
- FIG. 32 is a partial cross-sectional view showing the configuration of the rotor main body 711A of the rotor according to the first modification of the seventh embodiment.
- components that are the same as or correspond to the components shown in FIG. 30 are designated by the same reference numerals as those shown in FIG.
- the rotor main body 711A according to the first modification of the seventh embodiment is different from the rotor main body 711 according to the seventh embodiment in that the overhanging portion is fitted in the recess formed in the rare earth bond magnet.
- the rotor main body 711A of the rotor has a ferrite bond magnet 721A and a rare earth bond magnet 722A.
- the rare earth bond magnet 722A has a first recess 722h formed at the end 722c on the + z-axis side and a second recess 722i formed at the end 722d on the ⁇ z-axis side.
- the rare earth bond magnet 722A may have only one of the first recess 722h and the second recess 722i. Further, the rare earth bond magnet 722A may have a plurality of first recesses 722h or a plurality of second recesses 722i.
- the ferrite bond magnet 721A has a cylindrical portion 71, a first overhanging portion 72A, and a second overhanging portion 73A.
- the first overhanging portion 72A has a convex portion 72c as a first fitting portion.
- the convex portion 72c projects from the end surface of the first overhanging portion 72A on the ⁇ z axis side toward the rare earth bond magnet 722A.
- the convex portion 72c is fitted in the first concave portion 722h.
- the second overhanging portion 73A has a convex portion 73c as a second fitting portion.
- the convex portion 73c projects from the end face of the second overhanging portion 73A on the + z-axis side toward the rare earth bond magnet 722A.
- the convex portion 73c is fitted in the second concave portion 722i.
- the axial length L7 between the end portion 722c on the + z-axis side and the end portion 722d on the ⁇ z-axis side is the bottom surface 722j of the first recess 722h and the bottom surface 722k of the second recess 722i.
- the convex portion 72c of the first overhanging portion 72A is fitted into the first concave portion 722h formed in the rare earth bond magnet 722A. .. This makes it more difficult for the rare earth bond magnet 722A to fall off from the ferrite bond magnet 721A.
- the convex portion 73a of the second overhanging portion 73A is fitted into the second concave portion 722i formed at the end portion 722d on the ⁇ z axis side. ing. This makes it more difficult for the rare earth bond magnet 722A to fall off from the ferrite bond magnet 721A.
- FIG. 33 is a partial cross-sectional view showing the configuration of the rotor main body 711B of the rotor according to the second modification of the seventh embodiment.
- components that are the same as or correspond to the components shown in FIG. 30 are designated by the same reference numerals as those shown in FIG.
- the rotor body 711B according to the second modification of the seventh embodiment is different from the rotor body 711 according to the seventh embodiment in that the overhanging portion is fitted to the convex portion formed on the rare earth bond magnet. ..
- the rotor main body 711B has a ferrite bond magnet 721B and a rare earth bond magnet 722B.
- the rare earth bond magnet 722B has a first convex portion 722 m protruding from the + z-axis side end 722c to the + z-axis side and a second convex portion 722n protruding from the -z-axis side end 722d to the -z-axis side. And have.
- the rare earth bond magnet 722B may have only one of the first convex portion 722m and the second convex portion 722n. Further, the rare earth bond magnet 722B may have a plurality of first convex portions 722m or a plurality of second convex portions 722n.
- the ferrite bond magnet 721B has a cylindrical portion 71, a first overhanging portion 72B, and a second overhanging portion 73B.
- the first overhanging portion 72B has a through hole 72e as a first fitting portion.
- the through hole 72e is fitted in the first convex portion 722m.
- the first overhanging portion 72A may have a recess that fits into the first convex portion 722m instead of the through hole 72e.
- the second overhanging portion 73B has a through hole 73e as a second fitting portion.
- the through hole 73e is fitted in the second convex portion 722n.
- the second overhanging portion 73B may have a recess that fits into the second convex portion 722n instead of the through hole 73e.
- the axial length L7 between the end portion 722c on the + z-axis side and the end portion 722d on the ⁇ z-axis side is the tip surface 222j of the first convex portion 222m and the second convex portion 222n. It is smaller than the axial length L9 between the tip surface and the tip surface 222k.
- the through hole 72e of the first overhanging portion 72A is fitted to the first convex portion 722m of the rare earth bond magnet 722. This makes it more difficult for the rare earth bond magnet 722B to fall off from the ferrite bond magnet 721B.
- the through hole 73e of the second overhanging portion 73A is fitted to the second convex portion 722n of the rare earth bond magnet 722. This makes it more difficult for the rare earth bond magnet 722B to fall off from the ferrite bond magnet 721B.
- FIG. 34 (A) is a cross-sectional view showing the configuration of the rotor main body 711C of the rotor according to the third modification of the seventh embodiment.
- FIG. 34 (B) is another cross-sectional view showing the configuration of the rotor main body 711C of the rotor according to the third modification of the seventh embodiment.
- the rotor body 711C according to the third modification of the seventh embodiment is different from the rotor body 711 according to the seventh embodiment in that a plurality of rare earth bond magnets are connected to each other.
- the rotor main body 711C has a ferrite bond magnet 721 and a rare earth bond magnet 722.
- the rare earth bond magnet 722 has a plurality of pillar portions 741 arranged at intervals in the circumferential direction R1 and a connecting portion 751 for connecting the plurality of pillar portions 741 to each other.
- the outer diameter D72 of the ferrite bond magnet 721 is larger than the outer diameter D75 of the connecting portion 751.
- the connecting portion 751 is arranged between the end portion 722c on the + z-axis side and the end portion 722d on the ⁇ z-axis side of the rare earth bond magnet 722.
- the connecting portion 751 is arranged at the central portion in the axial direction of the rare earth bond magnet 722.
- the rare earth bond magnet 722 of the rotor main body 711 has a connecting portion 751 for connecting a plurality of pillar portions 741 to each other. This makes it more difficult for the rare earth bond magnet 722A to fall off from the ferrite bond magnet 721 during rotation.
- FIG. 35 is a configuration diagram showing a partial cross section and side surfaces of the motor 80 according to the eighth embodiment.
- the electric motor 80 has a stator 81 and a rotor 82.
- the electric motor 80 is, for example, a permanent magnet synchronous electric motor.
- the stator 81 has a stator core 81a and a mold resin portion 81b that covers the stator core 81a.
- a coil 81d is wound around the stator core 81a via an insulator 81c.
- the mold resin portion 81b is formed of, for example, a thermosetting resin such as BMC (Bulk Molding Compound) resin.
- the rotor 82 is arranged inside the stator 81 in the radial direction. That is, the electric motor 80 is an inner rotor type electric motor. Any of the rotors 1 to 7 of the first to seventh embodiments can be applied to the rotor 82.
- the shaft 10 of the rotor 82 is rotatably supported by bearings 83 and 84.
- the rotor 82 is provided with a sensor magnet 85.
- the sensor magnet 85 faces the circuit board 86.
- the rotation position of the rotor is detected by detecting the magnetic field of the sensor magnet 85 by the magnetic sensor 87 provided on the circuit board 86.
- the quality of the rotor can be improved because the rare earth bond magnet arranged on the outside is prevented from falling off. Therefore, the quality of the motor provided with the rotor can also be improved.
- FIG. 36 is a diagram schematically showing the configuration of the air conditioner 90 according to the ninth embodiment.
- the air conditioner 90 has an indoor unit 91 and an outdoor unit 95 connected to the indoor unit 91 via a refrigerant pipe 94.
- a cooling operation in which cold air is blown from the indoor unit 91, a heating operation in which warm air is blown, or the like can be performed.
- the indoor unit 91 has an indoor blower 92 as a blower and a housing 93 that covers the indoor blower 92.
- the indoor blower 92 has an electric motor 80 and an impeller 92a fixed to the shaft of the electric motor 80.
- the impeller 92a is driven by the electric motor 80 to generate an air flow.
- the impeller 92a is, for example, a cross flow fan.
- the outdoor unit 95 has an outdoor blower 96 as a blower, a compressor 97, and a housing 98 that covers the outdoor blower 96 and the compressor 97.
- the outdoor blower 96 has an electric motor 80 and an impeller 96a fixed to the shaft of the electric motor 80.
- the impeller 96a is driven by the electric motor 80 to generate an air flow.
- the impeller 96a is, for example, a propeller fan.
- the compressor 97 has an electric motor 97a and a compression mechanism 97b driven by the electric motor 97a.
- the electric motor 80 according to the eighth embodiment is applied to the indoor blower 92 and the outdoor blower 96.
- the quality of the motor 80 is improved because the rare earth bond magnet is prevented from falling off in the rotor. Therefore, the quality of the indoor blower 92 and the outdoor blower 96 is also improved. Further, the quality of the air conditioner 90 having the indoor blower 92 and the outdoor blower 96 is also improved.
- the electric motor 80 may be provided in either the indoor blower 92 or the outdoor blower 96. Further, the electric motor 80 may be applied to the electric motor 97a of the compressor 97. Further, the electric motor 80 according to the eighth embodiment may be mounted on another device other than the air conditioner 90.
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- Engineering & Computer Science (AREA)
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
図1は、実施の形態1に係る回転子1の構成を示す側面図である。図2は、実施の形態1に係る回転子1の構成を示す平面図である。図は、実施の形態1に係る回転子1の構成を示す底面図である。図1~3に示されるように、回転子1は、回転軸としてのシャフト10と、シャフト10に支持される回転子本体11と、シャフト10と回転子本体11とを連結する連結部12とを有している。回転子1は、シャフト10の軸線C1を中心に回転可能である。シャフト10は、z軸方向に延びている。以下の説明では、シャフト10の軸線C1を中心とする円の円周に沿った方向を「周方向」、z軸方向を「軸方向」、軸方向に直交する方向を「径方向」と呼ぶ。
図11は、実施の形態2に係る回転子の回転子本体211の構成を示す部分断面図である。図11において、図6に示される構成要素と同一又は対応する構成要素には、図6と同じ符号が付されている。実施の形態2に係る回転子本体211は、フェライトボンド磁石222に形成された凹部に張り出し部が嵌合している点で、実施の形態1に係る回転子本体111と相違する。
図12は、実施の形態2の変形例に係る回転子の回転子本体211Aの構成を示す部分断面図である。図12において、図11に示される構成要素と同一又は対応する構成要素には、図11に示される符号と同じ符号が付されている。実施の形態2の変形例に係る回転子本体211Aは、フェライトボンド磁石222Aに形成された凸部に張り出し部が嵌合している点で、実施の形態1に係る回転子本体111と相違する。
図13は、実施の形態3に係る回転子の回転子本体311の構成を示す断面図である。図13において、図6に示される構成要素と同一又は対応する構成要素には、図6に示される符号と同じ符号が付されている。実施の形態3に係る回転子本体311は、フェライトボンド磁石322に段差部が形成されている点で、実施の形態1に係る回転子本体111と相違する。
図15は、実施の形態3の変形例1に係る回転子の回転子本体311Aの構成を示す部分断面図である。図15において、図11及び13に示される構成要素と同一又は対応する構成要素には、図11及び13に示される符号と同じ符号が付されている。実施の形態3の変形例1に係る回転子本体311は、フェライトボンド磁石322Aの段差部に形成された凹部に張り出し部が嵌合している点で、実施の形態3に係る回転子本体311と相違する。
図16は、実施の形態3の変形例2に係る回転子の回転子本体311Bの構成を示す部分断面図である。図16において、図12及び13に示される構成要素と同一又は対応する構成要素には、図12及び13に示される符号と同じ符号が付されている。実施の形態3の変形例2に係る回転子本体311Bでは、フェライトボンド磁石322Bの段差部に形成された凸部に張り出し部が嵌合している点で、実施の形態3に係る回転子本体311と相違する。
図17(A)は、実施の形態4に係る回転子の回転子本体411の構成を示す拡大平面図である。図17(B)は、実施の形態4に係る回転子の回転子本体411の構成を示す拡大底面図である。図17(A)及び(B)において、図4に示される構成要素と同一又は対応する構成要素には、図4に示される符号と同じ符号が付されている。実施の形態4に係る回転子本体411は、張り出し部の形状の点で、実施の形態1に係る回転子本体111と相違する。
図18は、実施の形態4の変形例1に係る回転子の回転子本体411Aの構成を示す側面図である。図19(A)は、実施の形態4に係る回転子の回転子本体411Aの構成を示す拡大平面図である。図19(B)は、実施の形態4に係る回転子の回転子本体411Aの構成を示す拡大底面図である。実施の形態4の変形例1に係る回転子本体411Aは、第2の張り出し部の形状の点で、実施の形態4に係る回転子本体411と相違する。
図20(A)は、実施の形態4の変形例2に係る回転子の回転子本体411Bの構成を示す拡大平面図である。図20(A)において、図4に示される構成要素と同一又は対応する構成要素には、図4に示される符号と同じ符号が付されている。実施の形態4の変形例に係る回転子本体411Aは、張り出し部の形状の点で、実施の形態1に係る回転子本体11と相違する。
図21は、実施の形態5に係る回転子の回転子本体511の構成を示す平面図である。図22は、図21に示される回転子本体511をA22-A22線で切断した断面図である。図21及び22において、図1及び6に示される構成要素と同一又は対応する構成要素には、図1及び6に示される符号と同じ符号が付されている。実施の形態5に係る回転子本体511は、希土類ボンド磁石521の構成の点で、実施の形態1に係る回転子本体11と相違する。
図23は、実施の形態5の変形例に係る回転子の回転子本体511Aの構成を示す断面図である。図24は、実施の形態5の変形例に係るフェライトボンド磁石522Aの構成を示す平面図である。図23及び24において、図21及び22に示される構成要素と同一又は対応する構成要素には、図21及び22に示される符号と同じ符号が付されている。実施の形態5の変形例に係る回転子本体511Aは、リング部551、552がフェライトボンド磁石522Aの環状凹部522r、522sに配置されている点で、実施の形態5に係る回転子本体511と相違する。
図25は、実施の形態6に係る回転子6の構成を示す平面図である。図26は、図25に示される回転子6をA26-A26線で切断した断面図である。図25及び26において、図13に示される構成要素と同一又は対応する構成要素には、図13に示される符号と同じ符号が付されている。実施の形態6に係る回転子6は、リング部材661、662を更に有している点で、実施の形態1から5のいずれかに係る回転子と相違する。なお、図25及び26では、回転子6は、実施の形態3に係る回転子本体311を有している例を用いて説明する。
図27は、実施の形態6の変形例に係る回転子6Aの構成を示す平面図である。図27は、図28に示される回転子6AをA28-A28線で切断した断面図である。実施の形態6の変形例に係る回転子6Aは、リング部材661、662が連結部12と一体化されている点で、実施の形態6に係る回転子6と相違する。
図29は、実施の形態7に係る回転子の回転子本体711の構成を示す側面図である。図30は、実施の形態7に係る回転子本体711の構成を示す断面図である。実施の形態7に係る回転子本体711は、張り出し部がフェライトボンド磁石721に備えられている点で、実施の形態1から6のいずれかの回転子本体と相違する。
図32は、実施の形態7の変形例1に係る回転子の回転子本体711Aの構成を示す部分断面図である。図32において、図30に示される構成要素と同一又は対応する構成要素には、図30に示される符号と同じ符号が付されている。実施の形態7の変形例1に係る回転子本体711Aは、希土類ボンド磁石に形成された凹部に張り出し部が嵌合している点で、実施の形態7に係る回転子本体711と相違する。
図33は、実施の形態7の変形例2に係る回転子の回転子本体711Bの構成を示す部分断面図である。図33において、図30に示される構成要素と同一又は対応する構成要素には、図30に示される符号と同じ符号が付されている。実施の形態7の変形例2に係る回転子本体711Bは、希土類ボンド磁石に形成された凸部に張り出し部が嵌合している点で、実施の形態7に係る回転子本体711と相違する。
図34(A)は、実施の形態7の変形例3に係る回転子の回転子本体711Cの構成を示す断面図である。図34(B)は、実施の形態7の変形例3に係る回転子の回転子本体711Cの構成を示す他の断面図である。実施の形態7の変形例3に係る回転子本体711Cは、複数の希土類ボンド磁石が連結されている点で、実施の形態7に係る回転子本体711と相違する。
次に、上述した実施の形態1~7のいずれかの回転子を有する電動機80について説明する。図35は、実施の形態8に係る電動機80の部分断面及び側面を示す構成図である。図35に示されるように、電動機80は、固定子81と、回転子82とを有している。電動機80は、例えば、永久磁石同期電動機である。
図36は、実施の形態9に係る空気調和装置90の構成を概略的に示す図である。図36に示されるように、空気調和装置90は、室内機91と、冷媒配管94を介して室内機91に接続された室外機95とを有している。空気調和装置90では、例えば、室内機91から冷たい空気を送風する冷房運転、又は温かい空気を送風する暖房運転等を行うことができる。
Claims (25)
- 回転軸と、
前記回転軸に支持された回転子本体と
を有し、
前記回転子本体は、第1の永久磁石及び第2の永久磁石を有し、
前記第1の永久磁石は、前記第2の永久磁石の前記回転軸の軸方向の第1の端部に接する第1の張り出し部を有し、
前記第1の張り出し部と前記第1の端部とは、互いに接合されている
回転子。 - 前記第1の永久磁石は、前記軸方向の前記第1の端部の反対側の第2の端部に接する第2の張り出し部を更に有し、
前記第2の張り出し部と前記第2の端部とは、互いに接合されている
請求項1に記載の回転子。 - 前記第2の永久磁石は、前記軸方向の第1の端部に形成された第1の凹部又は第1の凸部を有し、
前記第1の張り出し部は、前記第1の凹部又は第1の凸部に嵌合する第1の嵌合部を有する
請求項1に記載の回転子。 - 前記第2の永久磁石は、前記軸方向の前記第1の端部の反対側の第2の端部に形成された第2の凹部又は第2の凸部を有し、
前記第1の永久磁石は、前記第1の端部の反対側の第2の端部に接する第2の張り出し部を更に有し、
前記第2の張り出し部は、前記第2の凹部又は第2の凸部に嵌合する第2の嵌合部を有する
請求項3に記載の回転子。 - 前記第2の永久磁石は、前記第1の端部から前記軸方向の一方に向けて凹む第1の段差部を有し、
前記第1の張り出し部と前記第1の段差部の底面とは、互いに接合されている
請求項1に記載の回転子。 - 前記第2の永久磁石は、前記軸方向の前記第1の端部の反対側の第2の端部から前記軸方向の他方に向けて第2の段差部を更に有し、
前記第1の永久磁石は、前記軸方向の前記第1の端部の反対側の第2の端部に接する第2の張り出し部を更に有し、
前記第2の張り出し部と前記第2の段差部の底面とは、互いに接合されている
請求項5に記載の回転子。 - 前記第2の永久磁石は、前記回転軸に支持され、
前記第1の永久磁石は、前記第2の永久磁石の外側に配置され、前記第2の永久磁石に支持されている
請求項1から6のいずれか1項に記載の回転子。 - 前記第1の永久磁石は、前記第1の張り出し部よりも前記回転子の径方向の外側に位置して前記第2の永久磁石に支持される柱部を更に有し、
前記第1の張り出し部の前記回転子の周方向の長さは、前記柱部の前記周方向の長さよりも長い
請求項7に記載の回転子。 - 前記第1の永久磁石は、前記軸方向の前記第1の端部の反対側の第2の端部に接する第2の張り出し部を更に有し、
前記第2の張り出し部と前記第2の端部とは、互いに接合されていて、
前記第2の張り出し部の周方向の長さは、前記第1の張り出し部の前記周方向の長さと同じである
請求項8に記載の回転子。 - 前記第1の永久磁石は、前記軸方向の前記第1の端部の反対側の第2の端部に接する第2の張り出し部を更に有し、
前記第2の張り出し部と前記第2の端部とは、互いに接合されていて、
前記第2の張り出し部の周方向の長さは、前記第1の張り出し部の前記周方向の長さと異なる
請求項8に記載の回転子。 - 前記第1の張り出し部は、前記柱部から前記回転子の周方向の一方に向かって延びる第1の部分と、前記柱部から前記周方向の他方に向かって延びる第2の部分とを有し、
前記周方向において前記第1の部分と前記第2の部分との間には、前記第2の永久磁石が配置されている
請求項8から10のいずれか1項に記載の回転子。 - 前記第1の永久磁石は、前記回転子の周方向に間隔をあけて配置されて前記第1の張り出し部を含む複数の第1の張り出し部と、前記周方向に隣接する前記複数の第1の張り出し部を連結する連結部とを有する
請求項7から11のいずれか1項に記載の回転子。 - 前記第2の永久磁石は、前記第1の端部に形成されて前記連結部が配置される溝部を有する
請求項12に記載の回転子。 - 前記軸方向において、前記第1の張り出し部及び前記第2の永久磁石に固定される第1の樹脂部を更に有する
請求項7から13のいずれか1項に記載の回転子。 - 前記回転軸と前記回転子本体とを連結する第2の樹脂部を更に有し、
前記第1の樹脂部は、前記第2の樹脂部と繋がっている
請求項14に記載の回転子。 - 前記第1の永久磁石は、希土類ボンド磁石であり、
前記第2の永久磁石は、フェライトボンド磁石である
請求項7から15のいずれか1項に記載の回転子。 - 前記第1の永久磁石は、前記回転軸に支持され、
前記第2の永久磁石は、前記第1の永久磁石の外側に配置され、前記第1の永久磁石に支持されている
請求項1から6のいずれか1項に記載の回転子。 - 前記第2の永久磁石は、前記回転子の周方向に間隔をあけて配置された複数の柱部と、前記周方向に隣接する前記複数の柱部を連結する連結部とを有する
請求項17に記載の回転子。 - 前記連結部は、前記第2の永久磁石の前記軸方向の前記第1の端部と前記第1の端部の反対側の第2の端部との間に配置されている
請求項18に記載の回転子。 - 前記第1の永久磁石は、フェライトボンド磁石であり、
前記第2の永久磁石は、希土類ボンド磁石である
請求項17から19のいずれか1項に記載の回転子。 - 2n(nは、1以上の自然数)個の磁極を有する回転子であって、
前記回転子本体の外周面を形成する前記第1の永久磁石及び前記第2の永久磁石は極異方性を有しており、磁極の強さが互いに異なる
請求項1から20のいずれか1項に記載の回転子。 - 請求項1から21のいずれか1項に記載の回転子と、
固定子と
を有する電動機。 - 請求項22に記載の電動機と、
前記電動機によって駆動される羽根車と
を有する送風機。 - 室内機と、
前記室内機に接続された室外機と
を有し、
前記室内機及び前記室外機の少なくとも1つは請求項22に記載の電動機を有する
空気調和装置。 - 第1の永久磁石及び第2の永久磁石を有する回転子本体を形成する工程と、
前記回転子本体を回転軸に連結する工程と
を有し、
前記回転子本体を形成する工程では、前記第1の永久磁石が前記第2の永久磁石の前記回転軸の軸方向の第1の端部に接する第1の張り出し部を有し且つ前記第1の張り出し部と前記第1の端部とが互いに連結されるように、前記第1の永久磁石と前記第2の永久磁石とを一体成形によって形成する
回転子の製造方法。
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CN202080098837.8A CN115298932A (zh) | 2020-03-27 | 2020-03-27 | 转子、电动机、送风机、空气调节装置及转子的制造方法 |
JP2022510338A JP7309039B2 (ja) | 2020-03-27 | 2020-03-27 | 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法 |
US17/796,424 US20230163648A1 (en) | 2020-03-27 | 2020-03-27 | Rotor, motor, blower, air conditioner, and manufacturing method of rotor |
PCT/JP2020/014062 WO2021192236A1 (ja) | 2020-03-27 | 2020-03-27 | 回転子、電動機、送風機、空気調和装置、及び回転子の製造方法 |
AU2020437705A AU2020437705C1 (en) | 2020-03-27 | 2020-03-27 | Rotor, motor, blower, air conditioner, and manufacturing method of rotor |
EP20927824.1A EP4131730A4 (en) | 2020-03-27 | 2020-03-27 | ROTOR, MOTOR, BLOWER, AIR CONDITIONING DEVICE AND METHOD OF MAKING ROTOR |
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JP2011087393A (ja) | 2009-10-14 | 2011-04-28 | Mitsubishi Electric Corp | 同期電動機の回転子 |
JP2016219607A (ja) * | 2015-05-21 | 2016-12-22 | 中川電化産業株式会社 | 磁石およびマグネットロータ |
WO2018016067A1 (ja) * | 2016-07-22 | 2018-01-25 | 三菱電機株式会社 | 電動機、空気調和機、回転子、及び電動機の製造方法 |
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JP5752273B2 (ja) * | 2011-12-27 | 2015-07-22 | 三菱電機株式会社 | 電動機 |
EP3902114A4 (en) * | 2018-12-17 | 2021-12-29 | Mitsubishi Electric Corporation | Rotor, electric motor, fan, air conditioner, and method for manufacturing rotor |
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JPH0993842A (ja) * | 1995-09-28 | 1997-04-04 | Sankyo Seiki Mfg Co Ltd | 小型モータのロータ |
JP2005151757A (ja) | 2003-11-19 | 2005-06-09 | Mate Co Ltd | ローター及びローターの製造方法 |
JP2011087393A (ja) | 2009-10-14 | 2011-04-28 | Mitsubishi Electric Corp | 同期電動機の回転子 |
JP2016219607A (ja) * | 2015-05-21 | 2016-12-22 | 中川電化産業株式会社 | 磁石およびマグネットロータ |
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WO2023144919A1 (ja) * | 2022-01-26 | 2023-08-03 | 三菱電機株式会社 | 回転子、電動機、送風機及び空気調和装置 |
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EP4131730A1 (en) | 2023-02-08 |
AU2020437705B2 (en) | 2023-10-19 |
CN115298932A (zh) | 2022-11-04 |
EP4131730A4 (en) | 2023-05-24 |
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AU2020437705A1 (en) | 2022-09-01 |
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