WO2007010948A1 - Moteur sans balai et son rotor - Google Patents

Moteur sans balai et son rotor Download PDF

Info

Publication number
WO2007010948A1
WO2007010948A1 PCT/JP2006/314297 JP2006314297W WO2007010948A1 WO 2007010948 A1 WO2007010948 A1 WO 2007010948A1 JP 2006314297 W JP2006314297 W JP 2006314297W WO 2007010948 A1 WO2007010948 A1 WO 2007010948A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
magnet
rare earth
bonded magnet
groove
Prior art date
Application number
PCT/JP2006/314297
Other languages
English (en)
Japanese (ja)
Inventor
Yoshinobu Honkura
Hironari Mitarai
Hiroshi Matsuoka
Daisuke Nagaya
Original Assignee
Aichi Steel Corporation
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 Aichi Steel Corporation filed Critical Aichi Steel Corporation
Publication of WO2007010948A1 publication Critical patent/WO2007010948A1/fr

Links

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

Definitions

  • the present invention relates to a brushless motor in which a bond magnet is provided on a rotor, and background art relating to the rotor
  • IPM motors and SPM motors are known as brushless motors!
  • IPM motors a structure in which a rare earth sintered magnet is embedded in a rotor is known!
  • silicon steel plates are mainly used for magnetic circuits, so there is a problem that the electromagnetic noise of the motor is large because of the saliency due to the distribution of surface magnetic flux due to the change in electrical angle.
  • the eddy current loss in the silicon steel plate it is necessary to reduce the thickness of the silicon steel plate to 0.3 mm or less. Even if this measure is taken, the eddy current loss is inferior to the SPM motor. .
  • Patent Document 1 discloses an SPM motor in which a magnet is provided on the surface of a rotor.
  • the outer periphery of the rotor is cylindrical and has a recess on the outer surface.
  • An anisotropic rare earth bonded magnet with polar anisotropy orientation is provided, and a rare earth sintered magnet is disposed in the recess.
  • scattering of rare earth sintered magnets becomes a problem. Therefore, a ring-shaped rare earth bonded magnet is in contact with the outer periphery of the rare earth sintered magnet and anisotropic rare earth bonded magnet. It is done.
  • Patent Document 1 JP 2004-242378 A
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to simplify the structure and facilitate manufacture by reducing the number of parts. Another object is to improve the output torque by making the manufacturing easier by eliminating the ring to prevent the magnets from scattering and by reducing the gap between the stator teeth. is there. Also, it is to improve the motor performance index (torque Z motor magnetic circuit component volume) and reduce the cogging torque.
  • the width taken in the circumferential direction of the opening on the side facing the armature of the rotor is the width in the circumferential direction inside the rotor.
  • a brushless motor comprising: a rotor having a narrower groove; and a bond magnet inserted into the groove.
  • the shape of the groove in the cross section perpendicular to the axis of the rotor is arbitrary.
  • the groove is opened on the side surface of the rotor, and the bonded magnet inserted into the groove is arranged so as to face the teeth of the stator directly at the opening of the groove.
  • the invention of claim 2 is the brushless motor according to claim 1, wherein in the rotor, a recess is formed from the outer periphery between adjacent grooves. By providing the recess, the cogging torque can be reduced.
  • the cross-sectional shape perpendicular to the rotor axis of the recess can be any shape such as strip, slit, V-shape, etc.
  • the invention of claim 3 is the brushless motor according to claim 1 or claim 2, wherein the bonded magnet is an anisotropic rare earth bonded magnet.
  • the output torque can be improved when the configuration of the present invention is employed.
  • the invention of claim 4 is the brushless motor according to any one of claims 1 to 3, wherein the bonded magnet is press-fitted into the groove. Since the bond magnet is elastic, it is possible to fix the bond magnet in the groove without using an adhesive by press-fitting into the rotor groove using the elasticity.
  • the invention according to claim 5 is an aperture in a brushless motor in which a rotor is provided with a permanent magnet, and the width taken in the circumferential direction of the opening on the side surface facing the armature of the rotor is an opening.
  • the rotor has a groove that is narrower than the width in the circumferential direction inside the rotor, and a bond magnet is inserted into the groove.
  • the invention according to claim 6 is the rotor according to claim 5, wherein a recess is formed from the outer periphery between adjacent grooves, and the invention according to claim 7
  • the bonded magnet is an anisotropic rare earth bonded magnet.
  • the above invention relates to a rotor used in the brushless motor according to claims 1 to 4, and the same configuration and modifications as those of the invention according to claims 1 to 4 can be adopted.
  • the circumferential width of the opening of the groove is configured to be narrower than the circumferential width of the groove inside the rotor. Will not be missed. Therefore, since it is not necessary to provide a ring made of a non-magnetic material or a magnetic material to prevent scattering, the magnetic resistance does not increase, and the output torque of the motor can be improved.
  • the magnetic ring for preventing scattering becomes a magnetic resistance in a magnetic circuit in which a magnetic flux that passes through the stator flows. Increasing force This magnetic ring does not exist in the present invention. Therefore, the output torque of the motor can be greatly improved. Further, since the outer peripheral surface force of the bonded magnet directly faces the stator teeth with a gap therebetween, almost all the magnetic flux of the bonded magnet can be passed through the stator teeth through the gap. As a result, the output torque can be improved.
  • the present invention makes it possible to reduce the torque motor performance index (torque Z magnetic circuit component volume) can be improved.
  • the present invention can improve torque even for IPM motors.
  • the torque per unit magnet usage (torque z magnet usage volume) is greatly improved.
  • the invention of claim 2 is characterized in that in the rotor, a recess is formed from the outer periphery between adjacent grooves.
  • the cogging torque can be reduced by forming the recess.
  • the bonded magnet is an anisotropic rare earth bonded magnet, the output torque can be improved.
  • the bonded magnet is press-fitted into the groove. Since it is fixed in the groove due to the elasticity of the bond magnet, the anti-scattering ring is not necessary, and there is no substance in the magnetic circuit that reduces the magnetic resistance, so the output torque can be increased.
  • inventions of claims 5 to 8 are inventions of a rotor used in the motor described above, and each exhibit the same effect as the above-described effect.
  • FIG. 1 is a configuration diagram showing a rotor of a brushless motor according to a specific embodiment of the present invention.
  • FIG. 2 is a perspective view showing the shape of an anisotropic rare earth bonded magnet.
  • FIG. 3 is a cross-sectional view showing an anisotropic rare earth bonded magnet attached to a rotor.
  • FIG. 4 is a cross-sectional view showing the structure of a rotor according to another embodiment.
  • FIG. 1 shows a configuration of a rotor 10 of an inner rotor type brushless motor.
  • a groove 20 having four openings 16 is provided on the outer peripheral surface 14 of a cylindrical rotor core 12 made of a magnetic laminate such as a silicon steel plate.
  • the circumferential width a of the opening 16 of the groove 20 is narrower than the width b of the groove inside the rotor.
  • the shape of the groove 20 on the cross section perpendicular to the axial direction has a crescent shape.
  • the groove 20 is composed of a curved surface 22 on the outer peripheral side and a curved surface 24 on the inner peripheral side, and the curved surface 24 on the inner peripheral side is formed concentrically with the outer peripheral surface 14 of the rotor iron core 12, and It is configured to be smaller than the curvature of the curved surface 22 on both sides. Due to the shape of the groove 20, the rotor iron core 12 has claws 51 and 52 formed on both sides of each groove 20. By the claws 51 and 52, the anisotropic rare earth bonded magnet 30 inserted into the groove 20 does not come off even when the port 10 rotates. An anisotropic rare earth bonded magnet 30 inserted into the groove 20 is configured as shown in FIG.
  • the shape of the cross section perpendicular to the rotor shaft is a crescent, and is composed of an outer peripheral curved surface 32 and an inner peripheral curved surface 34.
  • the inner peripheral curved surface 34 is an outer peripheral curved surface.
  • the central curved surface 321 is concentric with the curved surface 321, and the curved surface 34 has a smaller curvature than the curved surfaces 322 on both sides of the curved surface 32 on the outer peripheral side.
  • the unusual rare earth bonded magnet 30 is formed in a tile shape with the cross section and crescent shape extending in the axial direction.
  • the motor of the present embodiment is provided with a stator having teeth on the outside of the rotor 10 with a gap therebetween. A coil is wound around the teeth.
  • the heterogeneous rare earth bonded magnet 30 has a maximum energy product of 14MGOe (ll lKjZm 3 ) or more, and the maximum energy product is large. Therefore, the magnetoresistance of the magnetic circuit in the case of using the present invention is large. Due to the reduction effect, motor performance is greatly improved.
  • the anisotropic rare earth bonded magnet 30 is magnetized so that the outer peripheral surface 32 and the inner peripheral surface 34 become S poles, N poles, or the opposite magnetic poles. In the stator, the number of teeth on which the steel wire is arranged is six.
  • the anisotropic rare earth bonded magnet 30 has been finally mass-produced by the applicant in recent years.
  • the anisotropic rare earth bonded magnet 30 is manufactured by the manufacturing method of Japanese Patent Application Laid-Open No. 2001-76997, Japanese Patent No. 2816668, Japanese Patent No. 3060104, and International Patent Application PCTZJP03Z04532.
  • this anisotropic rare earth bonded magnet those having a maximum energy product of 17 MGOe to 28 MGOe (135 KJ / m 3 to 223 KJ / m 3 ) can be manufactured at present.
  • the anisotropic rare earth bonded magnet 30 used in the motor device of the present embodiment is configured in a tile shape in which the cross section perpendicular to the axis of Nd-Fe-B is a crescent shape.
  • the anisotropic rare earth bond magnet 30 is a magnet that is manufactured by resin molding magnetic powder made of Nd—Fe—B and is strongly magnetized in the radial direction.
  • materials for anisotropic rare earth bonded magnets Nd-Fe-B, Nd-Fe-B-based materials such as materials containing other rare earth elements such as Nd and Nd, or other additive elements are used. be able to.
  • materials containing rare earth elements other than Nd such as Sm—Fe—N-based materials, SmCo-based materials, or Nd—Fe—B-based materials, and mixed materials thereof can be used.
  • the anisotropic rare earth bonded magnet 30 is also called a plastic magnet. This magnet is characterized by a maximum energy product (BH) of about 5 times or more compared to conventional sintered ferrite magnets.
  • BH maximum energy product
  • the maximum energy product (BH) of a standard sintered ferrite magnet is 3.5 MGOe max
  • this anisotropic rare-earth bonded magnet has 17MGOe ( It has a maximum energy product of 135 Kj / m 3 ) or more.
  • the weight ratio of the resin in the anisotropic rare earth bonded magnet 30 was in the range of 2 W% or more and 3 W% or less.
  • Anisotropic magnet powder and resin are supplied to a mold, and in a heated state, a magnetic field is applied for orientation, followed by compression molding.
  • This molded body was cured and the degree of cure of the resin was improved to 90-100%. This enhanced the bond between the magnetic powder and resin, and between the resin and resin.
  • the molded body of the anisotropic rare earth bonded magnet 30 after curing was heated at a temperature below the glass transition temperature. This heating reduces the strength of the material without breaking the bond between the magnetic powder and the resin and between the resin and the resin, that is, by softening the resin so that the anisotropic rare earth bonded magnet 30 is removed.
  • the mechanical strength was maintained by reducing the stress exerted on the anisotropic rare earth bonded magnet 30 when the end face force of the slot was pressed into the groove 20 of the rotor 10.
  • the anisotropic rare earth bonded magnet 30 was pressed into the groove 20 and left for a while to cool the anisotropic rare earth bonded magnet 30.
  • the temperature at the time of press-fitting is preferably 60 to 100 ° C. This temperature range does not deteriorate the characteristics of the anisotropic rare earth bonded magnet, in addition to magnetic powder and resin, resin and resin. It is ideal for softening the resin without breaking the bond between the two and inserting the anisotropic rare earth bonded magnet 30 into the groove 40.
  • the outer peripheral surface 32 of the anisotropic rare earth bonded magnet 30 forms a part of the outer peripheral surface 14 of the rotor core 12. Therefore, the outer peripheral surface 32 of the anisotropic rare earth bonded magnet 30 directly faces the teeth with a gap therebetween, so that the gap can be made as narrow as possible.
  • the gap width can be 0.05 mm or more and 0.4 mm or less. Therefore, since the magnetic resistance of the magnetic circuit can be made as small as possible, almost all the magnetic flux possessed by the anisotropic rare earth bonded magnet 30 can be passed through the teeth. As a result, the ability of the anisotropic rare earth bonded magnet 30 having a large energy product can be sufficiently exerted.
  • the torque and motor performance index (torque Z magnetic circuit component volume) is improved by attaching the magnet to the rotor surface and eliminating the anti-scatter ring for the motor that uses the anti-scatter ring on the outside. be able to.
  • the present invention can improve the torque for the IPM motor.
  • the amount of unit magnet used for the motor that is prevented from scattering by the anisotropic rare earth bonded magnet of Patent Document 1. Torque (torque Z magnet usage volume) is greatly improved.
  • the thickness of the thickest portion of the anisotropic rare earth bonded magnet 30 is set in the range of 0.7 to 3 mm. If it is thinner than 1 mm, the surface magnetic flux density is lowered by the demagnetizing field of the anisotropic rare earth bonded magnet 30, which is undesirable. If it is thicker than 3 mm, the motor performance index will decrease, which is not desirable.
  • the circumferential width a of the opening 16 of the groove 20 is configured to be narrower than the width of the groove inside the rotor. Therefore, the anisotropic rare earth bonded magnet inserted into the groove 20 is Even if the rotor 10 rotates, it does not come off. Therefore, since it is not necessary to provide a ring made of a non-magnetic material or a magnetic material to prevent scattering, the magnetic resistance does not increase, and the output torque of the motor can be improved. In addition, since the outer peripheral surface force of the bonded magnet directly faces the teeth of the stator with a gap therebetween, almost all the magnetic flux of the bonded magnet can be passed through the stator teeth through the gap. As a result, the output torque can be improved.
  • this shape allows the change in the magnetic flux between the magnetic poles to be a sliding force, thereby reducing the cogging torque.
  • anisotropic rare earth bonded magnets are used, the magnet powder is surrounded and electrically insulated by insulating grease, which can reduce rotor eddy current loss and improve power efficiency. It becomes possible to make it.
  • the weight ratio of the resin of the anisotropic rare earth bonded magnet 30 is set to 2 W% or more and 3 W% or less, compression molding is performed, and after curing treatment, the degree of curing is 90 to: LOO%
  • the anisotropic rare earth bonded magnet 30 can be easily inserted and fixed in the groove 20 of the rotor 12 by reheating at a temperature below the glass transition point to obtain a softened state.
  • the present invention is effective as a high-output motor that satisfies high torque, low electromagnetic noise, low cogging torque, and low eddy current loss.

Landscapes

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

Abstract

Le problème à résoudre dans le cadre de laprésente invention consiste à augmenter le rendement d’un moteur sans balai. La solution proposée est un moteur sans balai (19) pourvu d’aimants permanents sur un rotor (12) comprenant un rotor (10) avec des encoches dans lesquelles la largeur circonférentielle (a) des pièces d’ouverture (16) est plus étroite que la largeur circonférentielle (b) des pièces du rotor sur les parois internes des pièces d’ouverture et des aimants à liaison de terres rares anisotropique (30) insérés dans les encoches (20). Dans la mesure où une partie de la surface incurvée de la paroi périphérique externe (32) de l’aimant à liaison de terres rares anisotropique fait directement face aux dents d’un stator à travers un interstice, la résistance magnétique d’un circuit magnétique peut être minimisée.
PCT/JP2006/314297 2005-07-20 2006-07-19 Moteur sans balai et son rotor WO2007010948A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005210617A JP4124215B2 (ja) 2005-07-20 2005-07-20 ブラシレスモータ
JP2005-210617 2005-07-20

Publications (1)

Publication Number Publication Date
WO2007010948A1 true WO2007010948A1 (fr) 2007-01-25

Family

ID=37668824

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/314297 WO2007010948A1 (fr) 2005-07-20 2006-07-19 Moteur sans balai et son rotor

Country Status (2)

Country Link
JP (1) JP4124215B2 (fr)
WO (1) WO2007010948A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2461462A3 (fr) * 2010-12-03 2012-10-24 C. & E. Fein GmbH Moteur à aimant permanent à couple de détente réduit
EP3021458A1 (fr) * 2014-11-13 2016-05-18 Siemens Aktiengesellschaft Rotor d'une éolienne
CN106464108A (zh) * 2014-04-29 2017-02-22 三菱电机株式会社 永磁型电动机
US20230024290A1 (en) * 2021-07-02 2023-01-26 Moteurs Leroy-Somer Rotating electrical machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4507208B2 (ja) * 2007-02-28 2010-07-21 日立金属株式会社 磁石回転子及びこれを用いた回転角度検出装置
JP5066214B2 (ja) * 2010-03-30 2012-11-07 株式会社日立産機システム 永久磁石同期機、及びこれを用いたプレス機または射出成形機
JP5641517B2 (ja) * 2010-06-16 2014-12-17 株式会社明電舎 ブラシレスモータ
CN107800215A (zh) * 2016-09-07 2018-03-13 赖国荣 马达转子磁铁固定结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01157253A (ja) * 1987-12-11 1989-06-20 Fuji Electric Co Ltd 永久磁石付き回転子
JP2000188837A (ja) * 1998-12-21 2000-07-04 Matsushita Electric Ind Co Ltd 永久磁石ロータおよびその製造方法
JP2004103871A (ja) * 2002-09-10 2004-04-02 Matsushita Electric Ind Co Ltd 異方性希土類ボンド磁石の製造方法とその永久磁石型モータ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01157253A (ja) * 1987-12-11 1989-06-20 Fuji Electric Co Ltd 永久磁石付き回転子
JP2000188837A (ja) * 1998-12-21 2000-07-04 Matsushita Electric Ind Co Ltd 永久磁石ロータおよびその製造方法
JP2004103871A (ja) * 2002-09-10 2004-04-02 Matsushita Electric Ind Co Ltd 異方性希土類ボンド磁石の製造方法とその永久磁石型モータ

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2461462A3 (fr) * 2010-12-03 2012-10-24 C. & E. Fein GmbH Moteur à aimant permanent à couple de détente réduit
CN106464108A (zh) * 2014-04-29 2017-02-22 三菱电机株式会社 永磁型电动机
CN106464108B (zh) * 2014-04-29 2018-11-16 三菱电机株式会社 永磁型电动机
EP3021458A1 (fr) * 2014-11-13 2016-05-18 Siemens Aktiengesellschaft Rotor d'une éolienne
US20230024290A1 (en) * 2021-07-02 2023-01-26 Moteurs Leroy-Somer Rotating electrical machine

Also Published As

Publication number Publication date
JP2007028857A (ja) 2007-02-01
JP4124215B2 (ja) 2008-07-23

Similar Documents

Publication Publication Date Title
US9876397B2 (en) Electrical machine
JP3864986B2 (ja) 薄型ハイブリッド着磁型リング磁石、ヨーク付き薄型ハイブリッド着磁型リング磁石、および、ブラシレスモータ
JP5614501B2 (ja) 回転電機用ロータ、回転電機、および、回転電機用ロータの製造方法
US8659199B2 (en) Axial gap permanent magnet motor, rotor used for the same, and production method of the rotor
US7981359B2 (en) Rotor and process for manufacturing the same
WO2007010948A1 (fr) Moteur sans balai et son rotor
US20190199149A1 (en) Consequent-pole-type rotor, electric motor, and air conditioner
US20160276894A1 (en) Motor
KR101888205B1 (ko) 차량 시동기용 회전 전기 기계
JP2010119190A (ja) 磁石埋め込み型モータ用ロータと磁石埋め込み型モータ
KR102124988B1 (ko) 영구자석 회전자, 영구자석 회전자의 제조 방법 및 자화 장치
JP2000333429A (ja) 無刷子電動機およびその製造方法
JP4029679B2 (ja) モータ用ボンド磁石及びモータ
JP2007028714A (ja) Ｄｃブラシモータ装置
JP2007208104A (ja) 複合ボンド磁石成形体
JP4241209B2 (ja) モータ装置及びその筐体の製造方法
JP4238588B2 (ja) モーター、モーター用ロータ及び複合異方性磁石
JP2006180677A (ja) 鉄心一体型スキュー磁石回転子およびその製造方法
JP2002034188A (ja) 永久磁石電動機およびその製造方法
JP3777839B2 (ja) 永久磁石埋込モータ
JP2009112121A (ja) 回転子およびそれを含むモータ
JP5188775B2 (ja) 小型ｄｃモータ
JP2006311661A (ja) ４極ｄｃブラシモータ
WO2023007708A1 (fr) Rotor et moteur
US20240039349A1 (en) Rotary electric machine and manufacturing method therefor

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 06781264

Country of ref document: EP

Kind code of ref document: A1