WO2019069661A1 - Rotor et moteur - Google Patents

Rotor et moteur Download PDF

Info

Publication number
WO2019069661A1
WO2019069661A1 PCT/JP2018/034167 JP2018034167W WO2019069661A1 WO 2019069661 A1 WO2019069661 A1 WO 2019069661A1 JP 2018034167 W JP2018034167 W JP 2018034167W WO 2019069661 A1 WO2019069661 A1 WO 2019069661A1
Authority
WO
WIPO (PCT)
Prior art keywords
circumferential
rotor
radial
permanent magnet
magnet
Prior art date
Application number
PCT/JP2018/034167
Other languages
English (en)
Japanese (ja)
Inventor
洋次 山田
茂昌 加藤
Original Assignee
株式会社デンソー
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 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2019069661A1 publication Critical patent/WO2019069661A1/fr

Links

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

Definitions

  • the present disclosure relates to a rotor and a motor.
  • IPM type rotor in which permanent magnets are embedded in a rotor core.
  • a structure for obtaining reluctance torque is considered.
  • permanent magnets in the rotor core are configured by forming the shape of permanent magnets in an arc shape that curves radially inward. The volume of the part located on the outer peripheral side of the is secured to improve the reluctance torque.
  • An object of the present disclosure is to provide a rotor and a motor capable of suitably securing both reluctance torque and magnet torque.
  • a rotor has a rotary shaft, a substantially cylindrical rotor core integrally fixed rotatably to the rotary shaft, and a plurality of permanent magnets embedded in the rotor core at intervals in the circumferential direction. And a magnet.
  • the permanent magnet has a first radial side surface on the outer peripheral side and a second radial side surface on the inner peripheral side, which make a pair in the radial direction, and makes a pair in the circumferential direction, and the circumferential end of the first and second radial side surfaces And a pair of circumferential side surfaces connecting the parts.
  • the circumferential side surface has a linear shape parallel to an imaginary line connecting the rotation axis and the magnetic pole boundary between the permanent magnets adjacent in the circumferential direction, as viewed in the axial direction.
  • the first radial side surface has a component surface located on the inner peripheral side with respect to an imaginary circle passing through the outer peripheral end of the circumferential side surface centering on the rotation axis, and in a direction orthogonal to the circumferential side surface The thickness between the circumferential side surface and the constituent surface increases inward in the radial direction.
  • FIG. 1 is a cross-sectional view of a motor of an embodiment of the present disclosure. It is a top view which shows the rotor of FIG. 1 partially. It is a top view which shows the rotor of a modification partially.
  • the motor 10 of the present embodiment shown in FIG. 1 is a brushless motor.
  • the motor 10 includes an annular stator 12 fixed to the inner peripheral surface of the motor housing 11, and a rotor 14 disposed radially inward of the stator 12 and having a rotating shaft 13.
  • the stator 12 has a cylindrical stator core 15, and the outer peripheral surface of the stator core 15 is fixed to the motor housing 11.
  • a plurality of (12 in the present embodiment) teeth 16 formed along the axial direction and arranged at equal intervals in the circumferential direction are formed to extend radially inward.
  • Each tooth 16 is a T-shaped tooth
  • the radially inner peripheral surface 16a is a circular arc surface extending in the axial direction a circular arc of a concentric circle centered on the axis (rotation axis L1) of the rotation shaft 13 is there.
  • Three-phase windings 17 are wound in a concentrated manner around each tooth 16. Then, a three-phase power supply voltage is applied to the windings 17 of each phase to form a rotating magnetic field in the stator 12, and the rotor 14 fixed to the rotating shaft 13 disposed inside the stator 12 is rotated. There is.
  • the rotor 14 disposed inside the stator 12 has a cylindrical rotor core 21 fixed to the rotating shaft 13 so as to be integrally rotatable, and a plurality of (eight in this embodiment) permanents embedded in the rotor core 21.
  • the rotor is configured as an embedded magnet type (IPM type) rotor including the magnet 22.
  • the rotor core 21 is configured by laminating a plurality of electromagnetic steel plates in the axial direction.
  • the rotary shaft 13 is rotatably supported by the motor housing 11 via a bearing (not shown).
  • the plurality of permanent magnets 22 respectively configure a plurality of magnetic pole portions 14 p of the rotor 14 having different polarities alternately in the circumferential direction. That is, the rotor 14 of this embodiment is comprised by eight poles. Further, the rotor 14 is a full magnet type rotor in which all the magnetic pole portions 14 p are configured by permanent magnets 22.
  • the permanent magnets 22 have the same shape (same size), and are arranged at equal intervals (45 ° intervals in the present embodiment) in the circumferential direction. Preferably, the permanent magnet 22 is filled in the magnet housing hole 21a formed to penetrate the rotor core 21 along the axial direction with almost no gap.
  • the permanent magnet 22 has a slightly curved shape so as to be convex radially inward when viewed in the axial direction.
  • the permanent magnet 22 is formed to be line symmetrical with respect to the circumferential center line L2 (a straight line perpendicular to the rotation axis L1 and passing the circumferential center of the permanent magnet 22).
  • the permanent magnet 22 has radially paired first and second radial side surfaces 31 and 32 and circumferentially paired circumferential side surfaces 33.
  • the outer peripheral side (radially outer side) surface is the first radial side surface 31, and the inner peripheral side (radial inner side) is the second radial direction side surface 32.
  • Each circumferential side surface 33 has a linear shape parallel to an imaginary line Lv connecting the magnetic pole boundary Pb between the permanent magnets 22 adjacent in the circumferential direction and the rotation axis L1 in the axial direction.
  • the first radial side surface 31 is a surface connecting the outer peripheral side end portions of the circumferential side surfaces 33
  • the second radial side surface 32 is a surface connecting the inner peripheral side end portions of the respective circumferential side surfaces 33.
  • the circumferential side surfaces 33 are surfaces connecting the circumferential end portions of the first and second radial side surfaces 31 and 32.
  • the circumferential side surface 33 is parallel to the circumferential side surface 33 of the permanent magnet 22 adjacent in the circumferential direction.
  • the first radial side surface 31 has a first component surface 31a located at a circumferential intermediate portion thereof and second component surfaces 31b located on both sides in the circumferential direction of the first component surface 31a.
  • the first component surface 31 a has an arc shape that is recessed inward in the radial direction when viewed in the axial direction. Further, the first component surface 31a is formed such that the whole of the first component surface 31a is located on the inner peripheral side (inward in the radial direction) than a virtual circle Cv passing the outer peripheral end of each circumferential side surface 33 with the rotation axis L1 as the center. ing.
  • the second component surface 31 b is a surface located on the virtual circle Cv and connecting the circumferential end of the first component surface 31 a and the outer peripheral end of the circumferential side surface 33. Further, the second radial side surface 32 has a circular arc shape concentric with the first component surface 31a, and is a curved surface that is recessed inward in the radial direction in the axial direction.
  • the thickness T between the circumferential side surface 33 and the first component surface 31 a in the direction orthogonal to the circumferential side surface 33 is formed to be thicker toward the radially inner side.
  • the length D1 of the circumferential side surface 33 in the direction along the imaginary line Lv is set longer than the radial length D2 from the circumferential center 31c of the first radial side surface 31 to the outer peripheral surface of the rotor core 21. .
  • the distance between the first constituent surface 31a in the radial direction and the outer peripheral surface of the rotor core 21 is The distance between the first constituent surface 31a in the radial direction and the outer peripheral surface of the rotor core 21 (that is, the radial thickness of the magnet outer core portion 21b located on the outer peripheral side of the first constituent surface 31a of the rotor core 21) is The circumferential center 31c is the longest. Further, in the present embodiment, the circumferential center 31 c of the first constituent surface 31 a coincides with the circumferential center line L 2 of the permanent magnet 22.
  • the magnetization orientation of the permanent magnet 22 is indicated by an arrow.
  • the magnetization orientation of the permanent magnet 22 is set to an orientation (polar anisotropic orientation) in which the radial inner side of the rotor 14 is curved from the permanent magnet 22 of the S pole toward the permanent magnet 22 of the adjacent N pole. It is done. That is, the magnetization orientation of the permanent magnet 22 is inclined toward the circumferential center line L2 of the permanent magnet 22 as it goes radially outward (the stator 12). The magnetization orientation of the permanent magnet 22 approaches the extending direction of the circumferential center line L2 of the permanent magnet 22 as it goes radially outward. Further, the magnetization orientation of the permanent magnet 22 of the present embodiment is set to intersect (substantially orthogonal) with the circumferential side surface 33 and to intersect with the imaginary line Lv.
  • Each permanent magnet 22 is made of, for example, a bonded magnet (a plastic magnet, a rubber magnet or the like), a sintered magnet or the like obtained by mixing magnet powder with a resin and molding and solidifying.
  • the bonded magnet has a higher degree of freedom in shape than a sintered magnet, and can be formed with high dimensional accuracy.
  • the permanent magnet 22 is preferably made of a rare earth magnet such as a samarium iron nitrogen (SmFeN) magnet, a samarium cobalt (SmCo) magnet, or a neodymium magnet.
  • the permanent magnet 22 is a sintered magnet
  • the permanent magnet 22 is preferably made of a rare earth magnet such as a ferrite magnet, a samarium cobalt (SmCo) magnet, or a neodymium magnet.
  • the operation of the present embodiment will be described.
  • a three-phase power supply voltage is applied to the windings 17 of the stator 12 to form a rotating magnetic field
  • the rotor 14 is rotated based on the rotating magnetic field. Specifically, the rotor 14 is rotated by the magnet torque generated by the action of the rotating magnetic field and the magnetic field of each permanent magnet 22 and the reluctance torque generated by the rotating magnetic field acting on the rotor core 21.
  • the first radial side surface 31 of the permanent magnet 22 has a first constituent surface 31a located on the inner peripheral side of the virtual circle Cv passing through the outer peripheral end of the circumferential side surface 33 with the rotation axis L1 as the center. .
  • the volume of the magnet outer core part 21b located in the outer peripheral side of the permanent magnet 22 in the rotor core 21 can be ensured, and as a result, a reluctance torque can be ensured.
  • the thickness T between the circumferential side surface 33 and the first component surface 31 a in the direction orthogonal to the circumferential side surface 33 is formed to be thicker toward the radially inner side.
  • the volume ratio of the permanent magnet 22 As compared with the case where the conventional permanent magnet simply formed in an arc shape (the both side surfaces in the radial direction are parallel to each other) is used.
  • the magnet torque can be improved.
  • the volume of the permanent magnet 22 is increased in the vicinity of the circumferential end of the permanent magnet 22, it is possible to effectively suppress the demagnetization of the permanent magnet 22 by the external magnetic field in the vicinity of the circumferential end. Magnet torque can be effectively improved.
  • the first component surface 31 a has a shape that is recessed inward in the radial direction when viewed in the axial direction. Thereby, radial thickness of magnet outer core part 21b can be secured suitably, and, as a result, reluctance torque can be improved effectively.
  • the length D1 of the circumferential side surface 33 in the direction along the imaginary line Lv is set longer than the radial length D2 from the circumferential center 31c of the first radial side surface 31 to the outer peripheral surface of the rotor core 21 .
  • the thickness T between the circumferential side surface 33 of the permanent magnet 22 and the first component surface 31a can be increased. Therefore, it can be more effectively suppressed that the permanent magnet 22 is demagnetized by the external magnetic field in the vicinity of the circumferential end, and as a result, the magnet torque can be further improved.
  • the permanent magnet 22 has a magnetization orientation intersecting the circumferential side surface 33. That is, in the present configuration in which the thickness T between the circumferential side surface 33 and the first component surface 31 a in the permanent magnet 22 can be easily secured, the magnetic path intersecting the circumferential side surface 33 of the permanent magnet 22 can be configured long. As a result, the permeance between the circumferential side surface 33 of the permanent magnet 22 and the first component surface 31a is improved, and the demagnetization resistance at the relevant portion is improved.
  • the above embodiment may be modified as follows.
  • the magnetization orientation of the permanent magnet 22 in the above embodiment is an example, and may be, for example, a radial orientation or a parallel orientation other than the polar anisotropic orientation.
  • magnetization orientation as shown in FIG. 3 may be used.
  • the magnetization orientation of the permanent magnet 22 is set linearly, and on the extension of the circumferential center line L2 (magnetic pole center line) of the permanent magnet 22 to the stator 12 side (radially outside). It is set to be directed to a certain point (magnetic flux concentration point F). According to such a configuration, substantially the same effect as that of the above embodiment can be obtained.
  • the dimension setting of the permanent magnet 22 in the said embodiment is an illustration, and you may change it suitably.
  • the length D1 of the circumferential side surface 33 may be set equal to the radial length D2, or the length D1 of the circumferential side surface 33 may be set shorter than the radial length D2.
  • the first component surface 31a has an arc shape that is recessed inward in the radial direction when viewed in the axial direction, but the entire first component surface 31a is located on the inner circumferential side relative to the virtual circle Cv. Then, the shape can be changed to a shape other than the arc shape.
  • the first component surface 31a may be configured by one or more planes. That is, the first component surface 31a may be formed in a planar shape orthogonal to the radial direction (the circumferential center line L2). The second radial direction side surface 32 can be similarly changed.
  • the 1st diameter direction side 31 was constituted from the 1st composition side 31a and a pair of 2nd composition side 31b, it does not restrict to this, for example, the 1st diameter side 31 from the 2nd composition
  • the surface 31 b may be omitted, and the circumferential end of the first component surface 31 a may be directly connected to the outer circumferential end of the circumferential side surface 33.
  • the number of poles of the rotor 14 and the number of slots of the stator 12 in the above embodiment are examples and can be changed as appropriate.
  • the number of poles and the number of slots of the rotor 14 may be appropriately changed such that the relationship between the number of poles of the rotor 14 and the number of slots is 2n: 3n (where n is a natural number).
  • the relationship between the number of poles of the rotor 14 and the number of slots does not necessarily have to be 2n: 3n.
  • the relationship between the number of poles of the rotor 14 and the number of slots is configured as 10:12, 14:12, etc. It is also good.
  • the rotor of this indication was applied to a brushless motor in the above-mentioned embodiment, the rotor of this indication may be applied not only to this but to a motor with a brush, for example.
  • the above-mentioned embodiment and each modification may be combined suitably.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

La présente invention concerne un rotor comprenant un arbre de rotation, un noyau de rotor et une pluralité d'aimants permanents incorporés à l'intérieur du noyau de rotor. Les aimants permanents comprennent une première surface côté direction radiale, une seconde surface côté direction radiale, et une paire de surfaces côté direction circonférentielle. Dans la vue axiale, les surfaces côté direction circonférentielle forment une ligne droite qui est parallèle à une ligne virtuelle reliant une partie de limite de pôle magnétique et un axe de rotation entre des aimants permanents adjacents dans la direction circonférentielle. La première surface côté direction radiale a une surface constitutive positionnée davantage vers le côté circonférence interne qu'un cercle virtuel qui passe à travers une partie d'extrémité côté circonférence externe de la surface côté direction circonférentielle autour de l'axe de rotation, et l'épaisseur entre la surface côté direction circonférentielle et la surface constitutive dans une direction orthogonale à la surface côté direction circonférentielle augmente vers le côté radialement vers l'intérieur.
PCT/JP2018/034167 2017-10-02 2018-09-14 Rotor et moteur WO2019069661A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-192836 2017-10-02
JP2017192836A JP7006103B2 (ja) 2017-10-02 2017-10-02 ロータ及びモータ

Publications (1)

Publication Number Publication Date
WO2019069661A1 true WO2019069661A1 (fr) 2019-04-11

Family

ID=65994514

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/034167 WO2019069661A1 (fr) 2017-10-02 2018-09-14 Rotor et moteur

Country Status (2)

Country Link
JP (1) JP7006103B2 (fr)
WO (1) WO2019069661A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102654659B1 (ko) * 2021-10-18 2024-04-05 엘지전자 주식회사 아크 타입 영구자석 및 이를 구비한 자속 집중형 로터

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1198721A (ja) * 1997-09-17 1999-04-09 Toshiba Corp 永久磁石電動機
JP2000125488A (ja) * 1998-10-09 2000-04-28 Denso Corp 電動機の回転子
JP2000228835A (ja) * 1999-02-05 2000-08-15 Fujitsu General Ltd 永久磁石電動機
WO2015093598A1 (fr) * 2013-12-20 2015-06-25 三菱電機株式会社 Moteur électrique à aimant permanent encastré, compresseur et dispositif de réfrigération et climatisation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4900775B2 (ja) * 2004-12-17 2012-03-21 日立金属株式会社 モータ用回転子およびその製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1198721A (ja) * 1997-09-17 1999-04-09 Toshiba Corp 永久磁石電動機
JP2000125488A (ja) * 1998-10-09 2000-04-28 Denso Corp 電動機の回転子
JP2000228835A (ja) * 1999-02-05 2000-08-15 Fujitsu General Ltd 永久磁石電動機
WO2015093598A1 (fr) * 2013-12-20 2015-06-25 三菱電機株式会社 Moteur électrique à aimant permanent encastré, compresseur et dispositif de réfrigération et climatisation

Also Published As

Publication number Publication date
JP7006103B2 (ja) 2022-01-24
JP2019068649A (ja) 2019-04-25

Similar Documents

Publication Publication Date Title
JP2695332B2 (ja) 永久磁石界磁形回転子
WO2013098940A1 (fr) Moteur électrique
CN108432091B (zh) 电动机
JP2012115085A (ja) ロータ及びモータ
US20130002081A1 (en) Permanent magnet rotor
US9024498B2 (en) Rotating electrical machine
US9762097B2 (en) Rotor and motor
JP2013188131A (ja) 永久磁石モータ
JP2013240146A (ja) ブラシレスモータ
JP2018082600A (ja) ダブルロータ型の回転電機
JP5702118B2 (ja) ロータの構造及びモータ
JP6408766B2 (ja) アキシャル立体ギャップ式回転電機
JP6950361B2 (ja) モータ
WO2019069661A1 (fr) Rotor et moteur
JP2023053154A (ja) ロータ及びロータの製造方法
JP2017118692A (ja) モータ及びモータの磁束調整方法
JP6950275B2 (ja) ロータ及びモータ
JP2014113036A (ja) 磁石埋込型ロータ、モータ、及び磁石埋込型ロータの製造方法
JP2013201865A (ja) ブラシレスモータ
JP2014087229A (ja) 磁石埋込型ロータ
JP2015092828A (ja) ロータ及びモータ
JP2021010211A (ja) 回転電機及び回転電機の製造方法
JP2015231253A (ja) マグネット及びこれを備えた回転電機
JP2014187858A (ja) ロータ、及びモータ
JP6390172B2 (ja) ロータ及びモータ

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18865085

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18865085

Country of ref document: EP

Kind code of ref document: A1