WO2023007706A1 - ロータ、モータ、及びロータの製造方法 - Google Patents

ロータ、モータ、及びロータの製造方法 Download PDF

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Publication number
WO2023007706A1
WO2023007706A1 PCT/JP2021/028378 JP2021028378W WO2023007706A1 WO 2023007706 A1 WO2023007706 A1 WO 2023007706A1 JP 2021028378 W JP2021028378 W JP 2021028378W WO 2023007706 A1 WO2023007706 A1 WO 2023007706A1
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WO
WIPO (PCT)
Prior art keywords
magnet
bond
rotor
magnets
bond magnet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/028378
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
義康 柴山
圭伍 今村
一輝 植田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
Kawasaki Jukogyo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawasaki Heavy Industries Ltd, Kawasaki Jukogyo KK filed Critical Kawasaki Heavy Industries Ltd
Priority to PCT/JP2021/028378 priority Critical patent/WO2023007706A1/ja
Priority to PCT/JP2022/023674 priority patent/WO2023007967A1/ja
Priority to JP2023538320A priority patent/JP7654795B2/ja
Publication of WO2023007706A1 publication Critical patent/WO2023007706A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • 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

  • the technology disclosed herein relates to a rotor, a motor, and a rotor manufacturing method.
  • a rotor provided with bond magnets as permanent magnets has been known, for example, as disclosed in Patent Document 1.
  • a plurality of magnet holes are formed in the rotor core in the circumferential direction, and bond magnets are embedded in each of the magnet holes.
  • the technology disclosed here has been made in view of this point, and its purpose is to reduce the manufacturing cost of rotors using bonded magnets.
  • the rotor disclosed herein includes a rotor body having a rotation axis, a plurality of first bond magnets arranged alternately in the rotor body in a circumferential direction about the rotation axis, and forming magnetic poles different from each other, and a plurality of bond magnets. and a second bonded magnet.
  • the first bond magnet and the second bond magnet are connected to each other.
  • the motor disclosed herein includes a cylindrical stator and the aforementioned rotor arranged inside the stator.
  • the rotor manufacturing method disclosed herein includes a rotor body having a rotating shaft, and a plurality of first magnetic poles arranged alternately in the rotor body in a circumferential direction centering on the rotating shaft and forming magnetic poles different from each other.
  • the rotor body formed by connecting a first placement hole for placing the first bond magnet and a second placement hole for placing the second bond magnet is coated with a predetermined metal.
  • FIG. 1 is a cross-sectional view of a motor according to Embodiment 1.
  • FIG. FIG. 2 is a plan view of the rotor according to Embodiment 1 as viewed in the direction of the rotation axis.
  • 3 is a perspective view of a magnet unit according to Embodiment 1.
  • FIG. FIG. 4 is a flowchart showing a rotor manufacturing method according to the first embodiment.
  • FIG. 5 is a diagram schematically showing a mold in which the rotor core according to Embodiment 1 is installed.
  • FIG. 6 is a cross-sectional view of a motor according to Embodiment 2.
  • FIG. FIG. 7 is a plan view of the rotor according to Embodiment 2 as viewed in the direction of the rotation axis.
  • FIG. 8 is a cross-sectional view taken along line XX shown in FIG.
  • FIG. 9 is a diagram schematically showing a mold in which a rotor core according to Embodiment 2 is installed
  • FIG. 1 is a cross-sectional view of a motor 100 according to Embodiment 1.
  • FIG. 2 is a plan view of the rotor 1 according to Embodiment 1 as viewed in the direction of the rotation axis A.
  • FIG. 1 is a cross-sectional view of a motor 100 according to Embodiment 1.
  • FIG. 2 is a plan view of the rotor 1 according to Embodiment 1 as viewed in the direction of the rotation axis A.
  • the motor 100 includes a rotor 1 that rotates around a predetermined rotation axis A, and a stator 6 that rotates the rotor 1 around the rotation axis A. Permanent magnets are embedded in the rotor 1 . That is, the motor 100 is an IPM (Interior Permanent Magnet) motor.
  • the motor 100 may further include a motor case 7 .
  • a motor case 7 accommodates the rotor 1 and the stator 6 .
  • the stator 6 is fixed with respect to the motor case 7 .
  • the rotor 1 is rotatably supported by the motor case 7 .
  • rotational axis direction A circumferential direction about the rotation axis A is called a “circumferential direction”.
  • a radial direction about the rotation axis A is called a “radial direction”.
  • the side facing the rotation axis A in the radial direction is referred to as “radial inner side”, and the side opposite to the rotation axis A is referred to as "radial outer side”.
  • the stator 6 has a stator core 61 and windings 62 .
  • Stator core 61 is a soft magnetic material.
  • the stator core 61 is formed, for example, from a plurality of magnetic steel sheets laminated together.
  • the stator core 61 is cylindrical.
  • the stator core 61 is fixed to the motor case 7 .
  • the stator core 61 is formed with a plurality of teeth 61a projecting inwardly of the stator core 61 .
  • a plurality of teeth 61a are arranged in a line in the circumferential direction of stator core 61 at intervals.
  • the winding 62 is wound around a plurality of teeth 61a.
  • the stator 6 forms a rotating magnetic field that rotates the rotor 1 when current is supplied to the windings 62 .
  • the rotor 1 includes a rotor body 2 having a rotation axis A, and a plurality of first bond magnets 41 and a plurality of second bond magnets 42 arranged on the rotor body 2 .
  • At least part of the rotor body 2 is made of a soft magnetic material.
  • the rotor body 2 has magnetic saliency and generates reluctance torque in the rotating magnetic field generated by the stator 6 .
  • the rotor body 2 rotates around the rotation axis A.
  • the rotor body 2 includes a cylindrical rotor core 3 and a shaft 5 .
  • a rotation axis A of the rotor main body 2 coincides with the axial center of each of the rotor core 3 and the shaft 5 .
  • the rotor core 3 is a soft magnetic material.
  • the rotor core 3 is formed, for example, from a plurality of magnetic steel sheets laminated together.
  • the rotor core 3 is formed in a cylindrical shape concentric with the stator core 61 .
  • the outer peripheral surface of the rotor core 3 forms the outer peripheral surface of the rotor body 2 .
  • the cross-sectional shape of the rotor core 3 perpendicular to the rotation axis A is the same over the entire length of the rotor core 3 in the rotation axis direction.
  • An air gap 10 is formed between the outer peripheral surface of the rotor core 3 and the inner peripheral surface of the stator core 61 .
  • the shaft 5 is fitted inside the rotor core 20 .
  • Shaft 5 is fixed to rotor core 20 .
  • the axis of the shaft 5 coincides with the rotation axis A.
  • the shaft 5 is rotatably supported by the motor case 7 via bearings and the like.
  • the rotor core 20 rotates around the rotation axis A together with the shaft 5 .
  • the shaft 5 is a soft magnetic material.
  • the first bond magnet 41 and the second bond magnet 42 are permanent magnets.
  • the plurality of first bond magnets 41 and the plurality of second bond magnets 42 are alternately arranged in the circumferential direction around the rotation axis A in the rotor body 2 to form magnetic poles different from each other.
  • the plurality of first bond magnets 41 and the plurality of second bond magnets 42 are alternately arranged in the rotor core 3 in the circumferential direction.
  • the first bond magnets 41 and the second bond magnets 42 are provided in the same number as each other, and in this example, six each are provided.
  • the first bond magnet 41 and the second bond magnet 42 are embedded in the rotor core 3. More specifically, the first bond magnet 41 and the second bond magnet 42 are embedded in a portion of the rotor core 3 radially inside the outer peripheral surface of the rotor core 3 in this example.
  • the first bond magnet 41 and the second bond magnet 42 have the same shape as each other in this example.
  • cross-sectional shape means a cross-sectional shape perpendicular to the rotation axis A.
  • the first bond magnet 41 and the second bond magnet 42 are formed in a plate shape extending in the rotation axis direction. More specifically, first bond magnet 41 and second bond magnet 42 extend over the entire length of rotor core 3 in the rotation axis direction.
  • the cross-sectional shape of each of the first bond magnet 41 and the second bond magnet 42 is the same over the entire length in the rotation axis direction of the first bond magnet 41 and the second bond magnet 42 .
  • the cross-sectional shape of each of the first bond magnet 41 and the second bond magnet 42 is linear. That is, the cross-sectional shape of each of the first bond magnet 41 and the second bond magnet 42 has a shape extending along a predetermined reference line.
  • the first bond magnet 41 has two ends 41a in the direction in which the reference line extends.
  • the second bond magnet 42 also has two ends 42a in the direction in which the reference line extends.
  • the cross-sectional shape of each of the first bond magnet 41 and the second bond magnet 42 is a curved shape concaved radially inward (that is, the rotation axis A), and in this example, is formed in a U shape. ing.
  • the first bond magnet 41 and the second bond magnet 42 are magnetized in a direction intersecting the reference line in a cross section perpendicular to the rotation axis A. Specifically, the magnetization directions of the first bond magnet 41 and the second bond magnet 42 are orthogonal to the reference line.
  • the first bond magnet 41 and the second bond magnet 42 are made of the same material. That is, the first bond magnet 41 and the second bond magnet 42 are each formed of a material (hereinafter also referred to as "magnet material") in which magnet powder and a binder for binding the magnet powder are mixed.
  • magnet material a material in which magnet powder and a binder for binding the magnet powder are mixed.
  • the magnet powder is, for example, a powder such as a neodymium magnet, a samarium iron nitrogen magnet, a samarium cobalt magnet, a ferrite magnet or an alnico magnet, or a mixture of two or more of these powders.
  • the binder is, for example, thermosetting resin such as epoxy resin, thermoplastic resin such as polyamide resin, or rubber. Bonded magnets can be molded like resin, and have higher dimensional accuracy and greater freedom in shape than sintered magnets.
  • the first bond magnet 41 and the second bond magnet 42 are connected to each other. That is, the first bond magnet 41 and the second bond magnet 42 are physically connected. Specifically, the first bond magnet 41 and the second bond magnet 42 that are connected to each other are connected so as to be in contact with each other in the rotor core 3 in the circumferential direction.
  • one set of magnet units 4 is formed by one first bond magnet 41 and one second bond magnet 42 that are adjacent in the circumferential direction.
  • the first bonded magnets 41 of one set of magnet units 4 are connected to the second bonded magnets 42 of the one set of magnet units 4, and are connected to the second bonded magnets 42 of the other set of magnet units 4.
  • one set of magnet units 4 is a single structure formed of one first bonded magnet 41 and one second bonded magnet 42 that are connected in the circumferential direction.
  • the rotor 1 is provided with a plurality of sets (six sets in this example) of the magnet units 4 .
  • the multiple sets of magnet units 4 are arranged at regular intervals in the circumferential direction of the rotor core 3 .
  • FIG. 3 is a perspective view of the magnet unit 4 according to Embodiment 1.
  • FIG. 3 in each magnet unit 4, the end 41a of the first bond magnet 41 and the end 42a of the second bond magnet 42 are connected. More specifically, magnet unit 4 is formed such that side surface 41b at end portion 41a of first bond magnet 41 and side surface 42b at end portion 42a of second bond magnet 42 are in contact with each other.
  • the side surfaces 41b and 42b of the first bond magnet 41 and the second bond magnet 42 are surfaces extending along the rotation axis direction.
  • the magnet unit 4 in which the first bond magnet 41 and the second bond magnet 42 are thus connected has a substantially W-shaped cross section.
  • Each magnet unit 4 thus formed forms two magnetic poles different from each other by the first bond magnet 41 and the second bond magnet 42 .
  • the rotor core 3 is formed with a plurality (six in this example) of arrangement holes 31 in which the plurality of magnet units 4 are respectively embedded.
  • Each of the plurality of arrangement holes 31 is a single through hole penetrating through the rotor core 3 in the rotation axis direction.
  • the cross-sectional shape of the arrangement hole 31 orthogonal to the rotation axis A is the same as the cross-sectional shape of the magnet unit 4 orthogonal to the rotation axis A. That is, the magnet unit 4 is embedded in the placement hole 31 with substantially no gap.
  • Each arrangement hole 31 is formed by a first arrangement hole 32 in which the first bond magnet 41 of the magnet unit 4 is arranged and a second arrangement hole 33 in which the second bond magnet 42 of the magnet unit 4 is arranged. It is That is, in the arrangement hole 31, the first arrangement hole 32 and the second arrangement hole 33 are connected.
  • the rotor 1 further comprises two cover plates 45.
  • the two cover plates 45 are provided on both end surfaces 3a of the rotor core 3 in the rotation axis direction.
  • the cover plate 45 has an annular shape when viewed in the rotation axis direction.
  • the cover plate 45 is provided to block the opening of the placement hole 31 in order to prevent the magnet unit 4 from slipping out of the placement hole 31 .
  • FIG. 4 is a flow chart showing a method for manufacturing the rotor 1 according to the first embodiment.
  • FIG. 5 is a diagram schematically showing the mold M in which the rotor core 3 according to Embodiment 1 is installed.
  • step S1 the rotor core 3, which is the rotor main body 2, is placed in a predetermined mold M. As described above, the rotor core 3 is formed with the first arrangement hole 32 in which the first bond magnet 41 is arranged and the second arrangement hole 33 in which the second bond magnet 42 is arranged, which are connected to each other.
  • the mold M is formed with a sprue Sp, a runner Ru and a gate Ga as flow paths for the magnet materials of the first bond magnet 41 and the second bond magnet 42 .
  • one sprue Sp is provided.
  • the same number of runners Ru and gates Ga are provided. That is, six runners Ru and six gates Ga are provided, which is the same number as the number of arrangement holes 31 (that is, the first arrangement holes 32 and the second arrangement holes 33 ) of the rotor core 3 .
  • Each of the six runners Ru branches off from the sprue Sp.
  • Each of the six gates Ga is provided at the exit end of the runner Ru and provided corresponding to the six placement holes 31 .
  • the first bonded magnet 41 and the second bonded magnet 42 before being magnetized are injection molded.
  • the magnet materials of the first bond magnet 41 and the second bond magnet 42 are injected into the arrangement hole 31 of the rotor core 3 through the mold M, and the first bonds before magnetization are connected to each other.
  • Magnet 41 and second bond magnet 42 are injection molded.
  • the magnet material is split into six runners Ru from the sprue Sp, and then injected into the placement holes 31 from the respective gates Ga. In this way, the first bond magnet 41 and the second bond magnet 42 before being magnetized are solidified and molded.
  • the magnet powder in the magnet material may be oriented during injection molding in step S2.
  • step S3 magnetization is performed by a magnetizer. Specifically, the first bond magnet 41 and the second bond magnet 42 connected to each other before being magnetized are magnetized by a magnetizer so that magnetic poles different from each other are formed. Thereby, two different magnetic poles are formed in the single magnet unit 4 in which the first bond magnet 41 and the second bond magnet 42 are connected.
  • the shaft 5 is attached to the rotor core 3.
  • the cover plate 45 is also attached to the rotor core 3. As shown in FIG. With the above, the manufacture of the rotor 1 is completed.
  • the runner Ru for injecting the magnet material into the placement hole 31 and the The number of channels such as gates Ga can be reduced. Therefore, the cost related to the mold M and the manufacturing cost of the rotor 1 are reduced.
  • the rotor 1 of Embodiment 1 includes a rotor body 2 having a rotation axis A and a plurality of magnetic poles arranged alternately in the circumferential direction about the rotation axis A in the rotor body 2 to form mutually different magnetic poles. , a first bond magnet 41 and a plurality of second bond magnets 42 . The first bond magnet 41 and the second bond magnet 42 are connected to each other.
  • the motor 100 of Embodiment 1 includes a cylindrical stator 6 and the above-described rotor 1 arranged inside the stator 6 .
  • the manufacturing method of the rotor 1 of the first embodiment includes the rotor core 3 (rotor main body 2) having the rotation axis A, and the rotor core 3 having magnetic poles alternately arranged in the circumferential direction around the rotation axis A and having different magnetic poles.
  • the rotor core 3 formed by connecting the first arrangement holes 32 for arranging the first bond magnets 41 and the second arrangement holes 33 for arranging the second bond magnets 42 is provided.
  • first bond magnet 41 and the second bond magnet 42 is passed through the predetermined mold M into the first placement hole 32 and the second placement hole 32 of the rotor core 3.
  • the first bond magnet 41 before magnetization and the second bond magnet 42 connected to each other are injected into the hole 33, and the first bond magnet 41 and the second bond magnet 42 before magnetization are connected to each other by injection molding. , and magnetizing such that different magnetic poles are formed.
  • the magnet material is applied to the first bond magnet in the mold M. It is possible to reduce the number of channels such as runners Ru and gates Ga for injecting into the arrangement hole 32 and the second arrangement hole 33 . Therefore, since the shape of the mold M is simplified, the cost of the mold M can be reduced. As a result, the manufacturing cost of the rotor 1 can be reduced.
  • the first bonded magnets 41 and the second bonded magnets 42 connected to each other are connected in the circumferential direction.
  • the number of gaps between the first bond magnet 41 and the second bond magnet 42 in the circumferential direction is reduced compared to, for example, the case where the first bond magnet and the second bond magnet are not connected. .
  • the so-called q-axis inductance decreases, so that magnetic flux short-circuiting in the gap between the first bond magnet 41 and the second bond magnet 42 can be suppressed.
  • the magnet torque generated by the first bond magnet 41 and the second bond magnet 42 can be increased, thereby improving the power factor.
  • one set of magnet units 4 is formed by one first bond magnet 41 and one second bond magnet adjacent in the circumferential direction.
  • the first bonded magnets 41 of one set of magnet units 4 are connected to the second bonded magnets 42 of one set of magnet units 4, and are not connected to the second bonded magnets 42 of the other set of magnet units 4. do not have.
  • all of the plurality of first bond magnets 41 and the plurality of second bond magnets 42 are not continuously connected in the circumferential direction.
  • the rotor core 3 is positioned radially inside and radially of the first bond magnets 41 and the second bond magnets 42 . separated from the outside.
  • portions of the rotor core 3 located radially outside the plurality of first bond magnets 41 and the plurality of second bond magnets 42 are fixed only to the first bond magnets 41 and the second bond magnets 42 . You can avoid this situation. Therefore, it is possible to prevent the radially outer portions of the plurality of first bond magnets 41 and the plurality of second bond magnets 42 from falling out of the rotor core 3 .
  • the magnet units 4 are not connected to each other, the magnetic flux flow between the first bonded magnet 41 of one set of magnet units 4 and the second bonded magnet 42 of the other set of magnet units 4 (that is, the 1) is generated, a certain amount of reluctance torque can be secured.
  • the cross-sectional shape orthogonal to the rotation axis A of the first bond magnet 41 and the second bond magnet 42 is a shape that is concave toward the rotation axis A.
  • the volumes of the first bond magnets 41 and the second bond magnets 42 in the rotor core 3 can be effectively increased. Therefore, magnet torque is improved.
  • FIG. 6 is a cross-sectional view of motor 100 according to the second embodiment.
  • FIG. 7 is a plan view of the rotor 1 according to Embodiment 2 as viewed in the direction of the rotation axis A.
  • FIG. 8 is a cross-sectional view taken along line XX shown in FIG.
  • the rotor 1 includes a plurality of first bond magnets 81 and a plurality of second bond magnets 42 .
  • the plurality of first bond magnets 81 and the plurality of second bond magnets 82 are alternately arranged in the circumferential direction in rotor core 3 .
  • First bond magnet 81 and second bond magnet 82 are connected to each other.
  • first bond magnet 81 and the second bond magnet 82 extend over the entire length of the rotor core 3 in the rotation axis direction, as in the first embodiment.
  • the plurality of first bond magnets 81 and the plurality of second bond magnets 82 are arranged at regular intervals in the circumferential direction of rotor core 3 .
  • the rotor 1 further includes a connecting portion 83.
  • the connecting portion 83 is made of the same magnet material as the first bond magnet 81 and the second bond magnet 82 .
  • Connecting portion 83 is provided on end surface 3a of rotor core 3 in the rotation axis direction, and connects end surfaces 81a and 82a in the rotation axis direction of first bond magnet 81 and second bond magnet 82, which are adjacent in the circumferential direction.
  • two connecting portions 83 are provided. That is, the connecting portions 83 are provided on both end faces 3a of the rotor core 3 in the rotation axis direction.
  • the connecting portion 83 connects the end surfaces 81 a and 82 a of all the first bond magnets 81 and the second bond magnets 82 .
  • all the first bond magnets 81 , all the second bond magnets 82 and the two connecting portions 83 are connected to form a single magnet unit 8 .
  • only one set of magnet units 8 is provided.
  • first bond magnet 81 and the second bond magnet 82 of the present embodiment are not connected so as to be in contact with each other in the circumferential direction, but are connected to each other through the connecting portion 83 at the end surfaces 81a and 82a.
  • Each of the two connecting parts 83 is a plate member having an annular shape when viewed in the direction of the rotation axis.
  • Connecting portion 83 is formed in a size that covers end face 81 a of first bond magnet 81 and end face 82 a of second bond magnet 82 .
  • the rotor core 3 has a plurality (six in this example) of first placement holes 35 in which the plurality of first bond magnets 81 are respectively arranged, and a plurality of (in this example, six) first placement holes 35 in which the plurality of second bond magnets 82 are respectively arranged.
  • six (6) second arrangement holes 36 are formed. That is, the plurality of first arrangement holes 35 and the plurality of second arrangement holes 36 are alternately arranged at equal intervals in the circumferential direction of the rotor core 3 . That is, the plurality of first placement holes 35 and the plurality of second placement holes 36 are separated from each other.
  • FIG. 9 is a diagram schematically showing the mold M in which the rotor core 3 according to Embodiment 2 is installed.
  • step S1 the rotor core 3 is placed in a predetermined mold M, as in the first embodiment.
  • the mold M is formed with two connecting portion spaces Ls in which two connecting portions 83 are molded.
  • the connecting portion space Ls is connected to the plurality of first arrangement holes 35 and the plurality of second arrangement holes 36 of the rotor core 3 . That is, in the mold, a single space is formed by the plurality of first arrangement holes 35, the plurality of second arrangement holes 36, and the two connecting portion spaces Ls.
  • the mold M is formed with a sprue Sp, a runner Ru and a gate Ga as flow paths for the magnet materials of the first bond magnet 41 and the second bond magnet 42 .
  • one sprue Sp is provided.
  • the same number of runners Ru and gates Ga are provided.
  • two runners Ru and two gates Ga are provided.
  • the number of runners Ru and gates Ga may be one, three, or four, and is set to a number smaller than the total number of first placement holes 35 and second placement holes 36 .
  • Two runners Ru each branch from the sprue Sp.
  • Each of the two gates Ga is provided at the outlet end of the runner Ru, and is provided corresponding to a predetermined position in the connecting portion space Ls.
  • magnet materials for the first bond magnet 81 and the second bond magnet 82 are injected into the first placement hole 35 and the second placement hole 36 of the rotor core 3 through the mold M, and are connected to each other by the connecting portion 83.
  • the first bond magnet 81 and the second bond magnet 82 before being magnetized which are connected, that is, the magnet unit 8 are injection molded.
  • the magnet material is split from the sprue Sp to the two runners Ru, and then injected from the respective gates Ga into one connecting space Ls.
  • the magnet material injected into one space Ls for the connecting portion flows into the other space Ls for the connecting portion through the plurality of first arrangement holes 35 and the plurality of second arrangement holes 36 .
  • the magnet material is filled into the plurality of first arrangement holes 35 and the plurality of second arrangement holes 36, and then filled into one of the connecting portion spaces Ls.
  • the first bond magnet 81 and the second bond magnet 82 before magnetization which are connected by the two connecting portions 83, that is, one magnet unit 8 before magnetization is solidified.
  • step S3 the first bond magnet 81 and the second bond magnet 82 before being magnetized are magnetized, and the shaft 5 is attached to the rotor core 3 in step S4, as in the first embodiment.
  • the mold M in which the rotor core 3 is installed a single space is formed by the plurality of first arrangement holes 35, the plurality of second arrangement holes 36, and the connecting portion space Ls. Therefore, the magnet material can be injected into this one single space. Therefore, in the mold M, the number of spaces into which the magnet material must be injected is reduced, so the number of flow paths such as runners Ru and gates Ga can be reduced as in the first embodiment. Thereby, the cost regarding the mold M can be reduced. As a result, the manufacturing cost of the rotor 1 can be reduced.
  • the end faces 81a and 82a of the first bond magnet 81 and the second bond magnet 82 which are provided on the end face 3a of the rotor core 3 in the rotation axis direction and are adjacent in the circumferential direction, It further includes a connecting portion 83 that connects the .
  • connecting portion 83 can also have a function of preventing first bond magnet 81 and second bond magnet 82 from slipping out of rotor core 3 . Therefore, no cover plate is required.
  • the connecting portions 83 are provided on both end surfaces 3a of the rotor core 3 in the rotation axis direction, it is possible to reliably prevent the first bond magnet 81 and the second bond magnet 82 from slipping out of the rotor core 3.
  • the connecting portion 83 connects the end surfaces 81 a and 82 a of all the first bond magnets 81 and the second bond magnets 82 , all the first bond magnets 81 and the second bond magnets 82 come out of the rotor core 3 . can definitely be prevented.
  • the plurality of first bond magnets 81 and the plurality of second bond magnets 82 are arranged at intervals in the circumferential direction of the rotor core 3, the flow of magnetic flux in the q-axis direction (that is, the "q magnetic flux flow in the direction of the "axis"). Therefore, reluctance torque can be secured.
  • Other configurations, actions and effects are the same as those of the first embodiment.
  • the numbers of the first bond magnets 41, 81 and the second bond magnets 42, 82 are not limited to the numbers described above. That is, the number of poles of the rotor 1 is not limited to the number mentioned above.
  • the number of magnet units 4, 8 is not limited to the number described above.
  • the number of the first bonded magnets 41 and the second bonded magnets 42 forming one set of magnet units 4 is not limited to the number described above.
  • a set of magnet units 4 may be formed by two first bond magnets 41 and two second bond magnets 42 adjacent in the circumferential direction of rotor core 3 . In that case, three sets of magnet units 4 are provided in the first embodiment.
  • all the first bond magnets 41 and all the second bond magnets 42 may form one set of magnet units 4 .
  • at least one of the plurality of first arrangement holes 32 and the plurality of second arrangement holes 33 may be provided with a dividing wall.
  • the dividing wall divides the first arranging hole 32 or the second arranging hole 33 in the direction in which it extends.
  • the magnet unit 4 is divided in the circumferential direction, that is, the plurality of first bond magnets 41 and the plurality of second bond magnets 42 are not continuously connected in the circumferential direction.
  • first bond magnets 41 and the plurality of second bond magnets 42 are attached to the rotor core 3 . Bonded magnets 42 can be linked.
  • one set of magnet units 8 includes three first bond magnets 81 and three second bond magnets 81 and 3 second bond magnets 81 and 82 in one section obtained by dividing the plurality of first bond magnets 81 and the plurality of second bond magnets 82 in the circumferential direction. It may be formed of bond magnet 82 and two connecting portions that connect end surfaces 81a and 82a of first bond magnet 81 and second bond magnet 82, respectively. In that case, two sets of magnet units 8 are provided. In this manner, three or four sets of magnet units 8 may be provided.
  • the shape of the connecting portion 83 when viewed in the rotation axis direction is not limited to an annular shape.
  • the connecting portion 83 may have a polygonal shape or a gear shape when viewed in the rotation axis direction.
  • the adhesive force between the first bond magnet 81 and the second bond magnet 82 and the first placement hole 35 and the second placement hole 36 is strong, and the first bond magnet 81 and the second bond magnet 82 If there is almost no possibility that the rotor core 3 will come out of the rotor core 3, the connecting portion 83 provided on one of the end faces 3a of the rotor core 3 may be omitted.
  • first bonded magnets 41, 81 and the second bonded magnets 42, 82 may be anisotropic bonded magnets or isotropic bonded magnets.
  • the cross-sectional shape of the first bond magnets 41, 81 and the second bond magnets 42, 82 perpendicular to the rotation axis is not limited to a curved shape.
  • these cross-sectional shapes may be curved so as to be recessed toward the rotation axis A.
  • these cross-sectional shapes may be, for example, V-shaped or W-shaped.
  • the first bond magnets 41, 81 and the second bond magnets 42, 82 may be flat plate members having linear cross-sectional shapes.
  • the shaft 5 does not have to be a soft magnetic material. Moreover, the shaft 5 may be formed integrally with the rotor core 3 .
  • Rotation shaft M Mold 100 Motor 1 Rotor 2 Rotor body 3 Rotor core (rotor body) 3a end face 32 first placement hole 33 second placement hole 35 first placement hole 36 second placement hole 4 magnet unit 41 first bond magnet 42 second bond magnet 6 stator 8 magnet unit 81 first bond magnet 81a end face 82 second second Bond magnet 82a End surface 83 Connecting portion A Rotation shaft M Mold

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
PCT/JP2021/028378 2021-07-30 2021-07-30 ロータ、モータ、及びロータの製造方法 Ceased WO2023007706A1 (ja)

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PCT/JP2022/023674 WO2023007967A1 (ja) 2021-07-30 2022-06-13 ロータおよびモータ
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4625769A1 (en) * 2024-03-25 2025-10-01 Aisin Corporation Rotor for rotary electric machine and method for manufacturing rotor for rotary electric machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11136888A (ja) * 1997-10-28 1999-05-21 Toshiba Corp 永久磁石形モータ及びその製造方法
JP2016086568A (ja) * 2014-10-28 2016-05-19 ダイキン工業株式会社 ロータおよび回転電気機械
JP2018182993A (ja) * 2017-04-20 2018-11-15 株式会社ジェイテクト ボンド磁石の射出成形装置及びボンド磁石の射出成形方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3855318B2 (ja) * 1996-10-07 2006-12-06 松下電器産業株式会社 永久磁石ロータ及びその製造方法
JP6760090B2 (ja) 2017-01-11 2020-09-23 株式会社デンソー 電動機のロータおよびそのロータを備える電動機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11136888A (ja) * 1997-10-28 1999-05-21 Toshiba Corp 永久磁石形モータ及びその製造方法
JP2016086568A (ja) * 2014-10-28 2016-05-19 ダイキン工業株式会社 ロータおよび回転電気機械
JP2018182993A (ja) * 2017-04-20 2018-11-15 株式会社ジェイテクト ボンド磁石の射出成形装置及びボンド磁石の射出成形方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4625769A1 (en) * 2024-03-25 2025-10-01 Aisin Corporation Rotor for rotary electric machine and method for manufacturing rotor for rotary electric machine

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