EP1421664A1 - Moteur electrique excite par des aimants permanents - Google Patents

Moteur electrique excite par des aimants permanents

Info

Publication number
EP1421664A1
EP1421664A1 EP02717982A EP02717982A EP1421664A1 EP 1421664 A1 EP1421664 A1 EP 1421664A1 EP 02717982 A EP02717982 A EP 02717982A EP 02717982 A EP02717982 A EP 02717982A EP 1421664 A1 EP1421664 A1 EP 1421664A1
Authority
EP
European Patent Office
Prior art keywords
rotor
electric motor
permanent magnets
recesses
motor according
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.)
Withdrawn
Application number
EP02717982A
Other languages
German (de)
English (en)
Inventor
Volker Bosch
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1421664A1 publication Critical patent/EP1421664A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • 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

Definitions

  • the present invention relates to an electric motor with permanent magnetic excitation, which has a rotor, on whose surface facing the inside of a stator, a plurality of permanent magnets are arranged.
  • Such a permanently magnetically excited electric motor is known, for example, from US Pat. No. 6,204,587 or DE 3 844 074 C2.
  • the rotors of the electric motors described in these publications have permanent magnets on their surface, with adjacent permanent magnets having opposite poles.
  • measures have to be taken in particular in high-speed engines to absorb the centrifugal forces acting on the permanent magnets.
  • a solid hollow cylinder is pushed onto the rotor in such a way that its inner wall rests directly on the permanent magnet.
  • the position of the permanent magnets is fixed on the rotor, thus reliably securing the permanent magnets even at very high speeds.
  • Permanent magnets which have a large wall thickness, are usually pressed from a magnetic material. Pressed magnetic material has only a low mechanical tensile strength, so that a z. B. from DE 3 844 074 C2 bandaging of the permanent magnets is required.
  • the invention has for its object to provide an electric motor of the type mentioned, in which the magnetic material forming the permanent magnets can be applied directly to the surface of the rotor in a relatively thin layer.
  • the rotor on the surface of which the material for the permanent magnets is applied, is provided on its surface and / or in its interior with cutouts which are placed and dimensioned in this way, that they do not interrupt lines of the magnetic flux which are aligned radially with respect to the surface of the rotor and which form a return line via the rotor.
  • the thermal expansion coefficients of the iron of the rotor and of the magnetic material differ very much, and the large heat capacity of the rotor leads to a rapid cooling of the z. B. applied by spraying magnetic material. Because of this, there is a risk that the applied magnetic material will tear. This undesirable effect can be reduced by the measure according to the invention for reducing the heat capacity avoid the rotor by making recesses in the rotor. Since the excitation flux, which runs from the permanent magnets of the rotor in the radial direction to the air gap between the rotor and the stator, increases the available torque of the motor, the recesses are placed in such a way that they just line the magnetic flux in the radial direction Do not interrupt the surface of the rotor.
  • the recesses are advantageously placed and dimensioned such that they are tangential or almost tangential to the rotor Interrupt lines of magnetic flux aligned with the surface of the rotor.
  • the permanent magnets advantageously consist of a layer of a plastic-bonded magnetic material sprayed onto the surface of the rotor.
  • At least one recess can be provided below each transition between two adjacent oppositely polarized permanent magnets, which has the shape of a slot that extends transversely to the longitudinal axis of the rotor. which extends in the direction of the longitudinal axis of the rotor.
  • Recesses in the interior of the rotor lead to a very strong reduction in the heat capacity of the rotor and they form ideal barriers for components of the magnetic flux oriented tangentially to the surface of the rotor.
  • the recesses located inside the rotor can be used to introduce a material into it that compensates for an imbalance in the rotor.
  • the rotor is advantageously constructed from layered iron sheets.
  • the only figure in the drawing shows a cross section through an electric motor, the stator 1 of which is shown only in part with two poles 2, 3 and the associated windings 4, 5.
  • a rotor 7 arranged on a motor shaft 6 is rotatably mounted within the stator 1.
  • the rotor 7 preferably consists of a stack of laminated iron sheets.
  • the stator 1 can consist of laminated iron sheets.
  • the rotor 7 and the stator 1 are preferably punched out of a sheet metal stack in one operation.
  • the electric motor shown in sections is a permanent magnet excited three-phase synchronous motor or a brushless DC motor. Therefore, the rotor 7 is coated on its surface with permanent magnets 8, 9, 10 and 11.
  • 4 permanent magnets 8, 9, 10 and 11 are applied to the surface of the rotor 7 in order to implement 4 magnetic poles, with adjacent permanent magnets being magnetized in the opposite direction radially to the surface of the rotor 7, as indicated by arrows.
  • the 4 permanent magnets 8, 9, 10, 11 are formed by a layer of a preferably plastic-bonded magnetic material (e.g. NdFeB) sprayed directly onto the surface of the rotor 7 forming an air gap with the inside of the stator 1.
  • the rotor 7 made of iron forms the yoke for the magnetic flux of the permanent magnets 8, 9, 10, 11.
  • the coefficients of thermal expansion of the magnetic material and the iron material of the rotor 7 are very different.
  • the heat capacity of the rotor 7 when it is made of a solid material is very high.
  • the heat capacity of the rotor yoke is very greatly reduced by the fact that recesses 12, 13, 14, 15 and / or recesses 16, 17, 18, 19 are made in the surface of the rotor 7 and 7.
  • cutouts 12 to 19 bring about a strong reduction in the thermal capacity of the rotor material, which prevents the magnetic material sprayed onto the rotor 7 from cooling down too quickly and thereby tearing.
  • the recesses 12, 13, 14 and 15, which are omitted in the surface of the rotor 7 and extend in the direction of the longitudinal axis, perpendicular to the plane of the drawing, of the rotor 7 are placed below the transitions between adjacent oppositely polarized permanent magnets 8, 9, 10, 11 ,
  • the placement of the recesses is chosen so that they are tangential or almost tangential to the surface lines of the magnetic flux which are aligned with the rotor and which form a return line via the rotor are interrupted.
  • several slot-shaped cutouts can also be embedded in the rotor 7.
  • the spin resistance of the rotor 7 can be increased by the fact that the recesses 12, 13, 14 and 15 embedded in the surface of the rotor 7 have a dovetail-shaped cross section. Because the dovetail shape of the recesses 12, 13, 14 and 15 enables the permanent magnets 8, 9, 10 and 11 to be wedged, so that they are secured not only against a rotational movement but also against a radial movement.
  • Non-magnetic material (“balancing cement”) can be introduced into the recesses 16, 17, 18, 19, which are in particular recessed in the interior of the rotor 7, in order to compensate for an imbalance of the rotor 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

Selon l'invention, un rotor (7) d'un moteur électrique est pourvu, sur sa surface et/ou dans sa partie intérieure, de cavités (12, 13, 14, 15, 16, 17, 18, 19) dont l'emplacement et les dimensions sont telles qu'elles n'interrompent pas des lignes du flux magnétique orientées radialement par rapport à la surface du rotor (7) et formant un retour magnétique (7) par l'intermédiaire du rotor. Ces cavités réduisent la capacité thermique du rotor (7) dans une mesure telle qu'une couche formant plusieurs aimants permanents (8, 9, 10, 11), constituée d'un matériau magnétique, peut être surmoulée par injection sur la surface du rotor (7).
EP02717982A 2001-07-18 2002-02-27 Moteur electrique excite par des aimants permanents Withdrawn EP1421664A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10135019 2001-07-18
DE10135019A DE10135019A1 (de) 2001-07-18 2001-07-18 Permanentmagnetisch erregter Elektromotor
PCT/DE2002/000725 WO2003009449A1 (fr) 2001-07-18 2002-02-27 Moteur electrique excite par des aimants permanents

Publications (1)

Publication Number Publication Date
EP1421664A1 true EP1421664A1 (fr) 2004-05-26

Family

ID=7692268

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02717982A Withdrawn EP1421664A1 (fr) 2001-07-18 2002-02-27 Moteur electrique excite par des aimants permanents

Country Status (7)

Country Link
US (1) US6803690B2 (fr)
EP (1) EP1421664A1 (fr)
JP (1) JP2004521600A (fr)
KR (1) KR100913683B1 (fr)
CN (1) CN1286244C (fr)
DE (1) DE10135019A1 (fr)
WO (1) WO2003009449A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102941157A (zh) * 2012-11-21 2013-02-27 湖北佳兴科技有限公司 高梯度强磁场水平聚磁辊

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7291953B1 (en) * 2002-02-21 2007-11-06 Anorad Corporation High performance motor and magnet assembly therefor
US6803682B1 (en) * 2002-02-21 2004-10-12 Anorad Corporation High performance linear motor and magnet assembly therefor
EP2073352B1 (fr) * 2007-12-17 2016-03-16 Siemens Aktiengesellschaft Machine synchrone à excitation permanente dotée d'aimants à coque
US8237320B2 (en) 2008-07-28 2012-08-07 Direct Drive Systems, Inc. Thermally matched composite sleeve
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
FR2959362B1 (fr) * 2010-04-23 2012-05-04 Valeo Equip Electr Moteur Rotor de machine electrique tournante avec structures interpolaires
DE102011110752A1 (de) * 2010-08-20 2012-03-15 Johnson Electric S.A. Bürstenloser Motor
TW201233005A (en) * 2011-01-18 2012-08-01 Yen Shen Electric Ind Co Ltd Motor rotor capable of being separately applied to two magnetic units
JP5920637B2 (ja) * 2013-11-22 2016-05-18 株式会社デンソー 回転電機の回転子
JP6389362B2 (ja) * 2013-12-25 2018-09-12 株式会社マキタ 電動工具
EP2996222A1 (fr) * 2014-09-10 2016-03-16 Siemens Aktiengesellschaft Rotor de machine électrique
JP6062900B2 (ja) * 2014-09-15 2017-01-18 トヨタ自動車株式会社 ロータの製造方法
DE102017121215A1 (de) * 2017-09-13 2019-03-14 Valeo Systèmes d'Essuyage Bürstenloser Elektromotor
JP7393759B2 (ja) * 2019-10-15 2023-12-07 国立大学法人北海道大学 モータ
WO2021076428A1 (fr) 2019-10-15 2021-04-22 Darrell Schmidt Enterprises, Inc. Coupleur magnetique
US11522436B2 (en) 2019-10-15 2022-12-06 Darrell Schmidt Enterprises, Inc. Permanently magnetized enhanced generator

Family Cites Families (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641080A (en) * 1984-10-18 1987-02-03 Sundstrand Corporation Permanent magnet generator with fault detection
US5130595A (en) * 1987-11-23 1992-07-14 Chrysler Corporation Multiple magnetic paths machine
GB2217924B (en) * 1988-04-25 1992-10-07 Matsushita Electric Works Ltd Permanent magnet rotor
US4973872A (en) * 1988-10-07 1990-11-27 Emerson Electric Co. Dynamoelectric machine rotor assembly with improved magnet retention stucture
DE3844074A1 (de) 1988-12-28 1990-07-05 Bosch Gmbh Robert Synchronmaschine
JPH0813174B2 (ja) * 1990-08-29 1996-02-07 松下電器産業株式会社 永久磁石付回転機の回転子
IT1245838B (it) * 1990-11-15 1994-10-24 Getters Spa Motore elettrico senza spazzole e rotore relativo.
US5679995A (en) * 1992-08-12 1997-10-21 Seiko Epson Corporation Permanent magnet rotor of brushless motor
JPH06351206A (ja) * 1993-04-14 1994-12-22 Meidensha Corp ハイブリッド励磁形永久磁石同期回転機
US5345130A (en) * 1993-04-28 1994-09-06 General Electric Company Modable permanent magnet rotor for optimized field shaping
JP3485881B2 (ja) * 1993-12-28 2004-01-13 三洋電機株式会社 圧縮機
EP0678967A1 (fr) * 1994-04-18 1995-10-25 General Electric Company Rotor pour moteur à aimants permanents
JPH07298577A (ja) * 1994-04-27 1995-11-10 Hitachi Ltd 直流電動機用回転子
JP3428783B2 (ja) * 1994-12-27 2003-07-22 キヤノン株式会社 走査光学装置のバランス修正方法
EP0729216A3 (fr) * 1995-02-21 1998-03-11 Siemens Aktiengesellschaft Machine synchrone à excitation hybride
DE69629192T2 (de) * 1995-05-30 2004-05-27 Vilmos TÖRÖK Selbststartender bürstenloser motor
AU6733196A (en) 1995-08-30 1997-03-19 Danfoss A/S Method of producing magnetic poles on a base member, and rotor of an electrical machine
JP3506165B2 (ja) * 1996-01-19 2004-03-15 株式会社安川電機 ブラシレスモータ
TW364234B (en) * 1997-04-14 1999-07-11 Sanyo Electric Co Rotor for an electric motor
US6087751A (en) * 1997-07-01 2000-07-11 Kabushiki Kaisha Toshiba Reluctance type rotating machine with permanent magnets
TW472429B (en) * 1997-07-07 2002-01-11 Canon Kk Motor
BR9702802A (pt) * 1997-08-28 2000-02-15 Brasil Compressores Sa Rotor para motor elétrico.
US6400055B1 (en) * 1998-04-20 2002-06-04 Canon Kabushiki Kaisha Motor
US6274960B1 (en) * 1998-09-29 2001-08-14 Kabushiki Kaisha Toshiba Reluctance type rotating machine with permanent magnets
JP2000156947A (ja) * 1998-11-17 2000-06-06 Yukio Kinoshita 磁石式電動機及び発電機
DE19911261C2 (de) * 1999-03-13 2002-05-02 Siemens Ag Permanentmagnet-Rotor für einen Elektromotor
JP2001025209A (ja) * 1999-07-05 2001-01-26 Nissan Motor Co Ltd 電動機のロータ
KR20010054562A (ko) * 1999-12-07 2001-07-02 송재인 직류 전동기의 회전자
JP3654806B2 (ja) * 1999-12-27 2005-06-02 松下電器産業株式会社 電動機の永久磁石回転子およびこれを用いた密閉型圧縮機
DE60141308D1 (de) * 2000-03-31 2010-04-01 Sanyo Electric Co Synchronmotor mit internem Dauermagnet
JP2002078259A (ja) * 2000-08-31 2002-03-15 Yamaha Motor Co Ltd 永久磁石回転子
US6552459B2 (en) * 2001-03-20 2003-04-22 Emerson Electric Co. Permanent magnet rotor design

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03009449A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102941157A (zh) * 2012-11-21 2013-02-27 湖北佳兴科技有限公司 高梯度强磁场水平聚磁辊
CN102941157B (zh) * 2012-11-21 2016-01-27 湖北佳兴科技有限公司 高梯度强磁场水平聚磁辊

Also Published As

Publication number Publication date
KR100913683B1 (ko) 2009-08-24
CN1462499A (zh) 2003-12-17
CN1286244C (zh) 2006-11-22
DE10135019A1 (de) 2003-01-30
US20030151324A1 (en) 2003-08-14
US6803690B2 (en) 2004-10-12
WO2003009449A1 (fr) 2003-01-30
KR20040019333A (ko) 2004-03-05
JP2004521600A (ja) 2004-07-15

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