WO2000014859A1 - Rotor de moteur electrique et procede de fabrication - Google Patents

Rotor de moteur electrique et procede de fabrication Download PDF

Info

Publication number
WO2000014859A1
WO2000014859A1 PCT/BR1998/000078 BR9800078W WO0014859A1 WO 2000014859 A1 WO2000014859 A1 WO 2000014859A1 BR 9800078 W BR9800078 W BR 9800078W WO 0014859 A1 WO0014859 A1 WO 0014859A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor core
rotor
magnet elements
electric motor
retaining layer
Prior art date
Application number
PCT/BR1998/000078
Other languages
English (en)
Inventor
Marcos Romeu MÖBIUS
Marcos Guilherme Schwarz
Marcos Giovani Dropa Bortoli
Original Assignee
Empresa Brasileira De Compressores S.A. - Embraco
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 Empresa Brasileira De Compressores S.A. - Embraco filed Critical Empresa Brasileira De Compressores S.A. - Embraco
Priority to PCT/BR1998/000078 priority Critical patent/WO2000014859A1/fr
Publication of WO2000014859A1 publication Critical patent/WO2000014859A1/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
    • 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

Definitions

  • the present invention refers to an electric motor rotor and to a process for producing an electric motor rotor of the type used in a hermetic compressor for refrigeration systems and comprising a plurality of magnets placed around the rotor core and usually surrounded by a cover.
  • the electric motor rotor with permanent magnets comprises magnets, which are concentrically mounted to the rotor core and around the motor shaft, said magnets being retained in this condition in order to avoid radial and circumferencial displacements in relation to each other and to the rotor core during the operation of the motor, when the magnets are submitted to centrifugal forces, which tend to separate them from the rotor core, and to shearing forces, which cause the circumferential displacement of said magnets around the core.
  • the magnets are affixed to the rotor core by gluing. Besides allowing the magnets to be easily affixed to the rotor core, this technique further allows maximum electrical efficiency to be obtained from the motor.
  • the product thus obtained is not very reliable, due to the weak attachment of the magnets to the rotor core, to the centrifugal forces to which they are submitted during the operation of the motor and to the high thermal stresses imparted to the parts, resulting from the different deformations of the materials used.
  • other known techniques are used, in which the magnets are retained through the provision of a rotor cover surrounding the magnets mounted to the rotor core.
  • the magnets are pressed onto the rotor core by a metallic cover.
  • an electric motor rotor comprising a rotor core having a lateral face and end annular faces; magnet elements provided around the rotor core and retained in position thereon by a retaining layer of adhesive material defined between the rotor core and the magnet elements, said retaining layer being defined so as to have a determined minimum thickness, the adhesive material which forms the retaining layer having a modulus of elasticity which is lower than the modulus of elasticity of any of the parts defined by the rotor core and magnet elements, in order to allow, together with said minimum thickness of the retaining layer, the absorption of the thermal deformations of the parts defined by the rotor core and magnet elements during the operation of the electric motor.
  • Figure 1 illustrates, schematically and respectively, a cross- sectional view and a longitudinal diametrical sectional view of an electric motor rotor constructed according to a first embodiment of the present invention
  • Figures 2 and 2a illustrate, schematically and respectively, an upper plan view and a longitudinal diametrical sectional view of an electric motor rotor constructed according to a second embodiment of the present invention.
  • the present invention refers to an electric motor rotor of the type comprising a rotor core 10, which is to be mounted and affixed to a motor shaft E, surrounding at least part of the latter, and around which are seated magnet elements 20, usually in the form of arcuate longitudinal plates, which are circumferentially spaced from each other and retained against a lateral face 11 of the rotor core 10, which is further provided with end annular faces 12.
  • the magnet elements 20 are retained to the rotor core 10 through a retaining layer 30, which is defined between the rotor core 10 and the magnet elements 20 and occupies at least part of the internal surface of the latter, said retaining layer 30 being in the form of an interface of adhesive material, for example, a curable polymeric material, with a modulus of elasticity which is lower than the modulus of elasticity of the rotor core 10 and of the magnet elements 20, after said retaining layer 30 already provided on the rotor has cured .
  • adhesive material for example, a curable polymeric material
  • the retaining layer 30 should have, after its adhesive material has cured, a determined minimum thickness, which is pre-established so as to act as a pad for the magnet elements 20, upon said magnets being pressed against the rotor core 10 by action of a rotor cover 40, to be described hereinafter, which absorbs thermal deformations from both the rotor core 10 and magnet elements 20 associated with the temperature variations of the rotor, upon operation of the electric motor and with the different coefficients of dilatation of the materials (steel which forms the rotor core and magnet elements) which are bonded together by the retaining layer 30.
  • the adhesive material used for obtaining the retaining layer 30 is defined in order to produce a retention degree of the magnet elements 20 in relation to the rotor core 10 which may be maintained substantially unaltered under conditions of centrifugal forces and rotational forces (torque) existing during the operation of the motor.
  • the adequate thickness of the retaining layer 30 is obtained by maintaining, until the complete cure or until a determined partial cure degree substantially close to the full cure degree of the adhesive material has been achieved, the magnet elements 20 spaced from the rotor core 10 by a pre-established minimum distance, in order to define for the retaining layer 30, after the cure of its adhesive material, a minimum radial spacing between the lateral face 11 of the rotor core 10 and the confronting internal face of the magnet elements 20.
  • the modulus of elasticity of the adhesive material which forms the retaining layer 30 is selected so as to allow that, together with the determination of the minimum thickness of the retaining layer 30, the latter may absorb the thermal deformations existing between the rotor core 10 and magnet elements 20, avoiding the occurrence of high stresses of thermal origin on the magnet elements 20, on the core and on the retaining layer 30 itself.
  • the rotor of the present invention is produced, by providing positioning means 50 which act on the magnet elements 20, in order to maintain the latter at a predetermined minimum distance from the rotor core 10 to allow the formation of the retaining layer 30, until cure of the adhesive material of the retaining layer 30 is achieved.
  • the minimum distance between the magnet elements 20 and the rotor core 10 is obtained by an active process control in real time, which, through the adequate positioning means, retain the magnet elements 20 spaced from the rotor core 10 (without being necessarily located therebetween) for introducing therebetween the adhesive material which will form the retaining layer 30, said positioning condition being thus maintained, until the cure of said retaining layer 30 has ended.
  • the positioning means 50 are defined as removable or permanent spacing means, which are provided between the rotor core 10 and the magnet elements 20 and which are designed so as to maintain the minimum radial spacing between the lateral face 11 of the rotor core 10 and the confronting internal face of the magnet elements 20, at least until a determined curing phase of the adhesive material of the retaining layer 30 has been achieved, after which phase the removal of the removable spacing means 50 will not alter said minimal radial spacing of the retaining layer 30.
  • the positioning means 50 may be removed during the manufacturing process of the rotor, after the curing phase of the adhesive material which forms the retaining layer 30, when the removal of said spacing means affects no more the minimum distance between the magnet elements 20 and the rotor core 10.
  • a retaining layer 30 with permanent spacing means 50 may be provided in an aggregated (or embedded) form to the adhesive material of the retaining layer 30 (figures 1 and la), before or during the application of said material to the lateral face 11 of the rotor core 10, or also provided in the form of radial ribs affixed or incorporated in at least one of the parts of rotor core 10 and magnet elements 20.
  • Said radial ribs may be provided such as described in copending Patent Application PI9504773-5, of the same applicant.
  • said spacing means 50 are aggregated to the adhesive material of the retaining layer 30, said spacing means should have a determined modulus of elasticity at maximum substantially equal to that of the retaining layer 30, after the cure of the adhesive material of the latter has been effected, so as not to alter the characteristic of absorbing the thermal deformations of both the rotor core 10 and magnet elements 20, since the provision of spacing means 50 with a high modulus of elasticit would generate regions of thermal stress in the retaining layer 30 and in the magnet elements 20, diminishing their characteristic of absorbing the thermal deformations of said rotor core and magnet elements .
  • said spacing means are defined by a plurality of particulate elements with any shape, for example spherical, such as glass, plastic material, etc., or also m the form of rods, plates or similar elements, with a structural material having said characteristic of modulus of elasticity.
  • the spacing means 50 are permanent and in the form of radial ribs
  • the latter should be longitudinally affixed, for example incorporated in at least one of the parts defined by the lateral face 11 of the rotor core 10 and internal face of each magnet element 20, extending along at least part of the axial extension of the respective part to which they are affixed and m order to be provided, in pairs, between each magnet element 20 and the rotor core 10, symmetrically in relation to the transversal plane of symmetry of the respective magnet element 20, each radial rib being adjacent to an end portion of the corresponding magnet element 20, as described in copending Patent Application PI9504773, of the same applicant.
  • this assembly is surrounded, at least laterally, by a tubular cover 40 made of a thermo- retractable material and having a determined radial gap, which is designed in order that, after submitted to a thermal contraction in which it may have its dimensions reduced up to 50% of its original value, the cover exerts a determined compressive radial force on the magnet elements 20 or only over a portion of the adjacent external face of said magnet elements 20, so as to maintain the latter, or part thereof, substantially immobilized in relation to the rotor core 10.
  • a tubular cover 40 made of a thermo- retractable material and having a determined radial gap, which is designed in order that, after submitted to a thermal contraction in which it may have its dimensions reduced up to 50% of its original value, the cover exerts a determined compressive radial force on the magnet elements 20 or only over a portion of the adjacent external face of said magnet elements 20, so as to maintain the latter, or part thereof, substantially immobilized in relation to the rotor core 10.
  • the rotor cover 40 avoids that chips or any other fragments from the magnet elements 20 resulting from partial disaggregation thereof (due to rotational forces and, if still existing, to residua.l stresses of thermal origin, or also due to impacts or vibrations caused by transportation, for example) be radially expelled from the rotor to the inside of the motor where said rotor operates .
  • the radial retention of these fragments may be achieved by the provision of end annular caps 60, each being placed adjacently to an end annular face 12 of the rotor core 10, radially extending until it covers the adjacent end edge of the rotor cover 40.
  • the rotor cover 40 may have an axial extension which is larger than that of the rotor core 10, in order to form, after being mounted and contracted, a pair of end annular flanges 41, which are radially inwardly turned and each being seated against a respective end face of the pair of end faces of each magnet element 20, and also covering, for instance, at least the adjacent end edge of the retaining layer 30 or, as illustrated in figures 2-3a, covering at least part of the radial extension of the adjacent end annular face 12 of the rotor core 10, providing an axial locking of the rotor cover 40 in relation to the rotor core 10.
  • the rotor cover 40 may have a larger or smaller axial extension, in order to form end flanges with any extension, ranging from zero, when the cover has only a lateral wall, up to the value of maximum extension, covering the end annular faces of the rotor core 10.
  • the rotor cover 40 functions as a sealing element to avoid the radial and axial expel of fragments from the magnet elements 20 and also provides finishing to the end portions of the rotor core 10 -magnet elements 20 assembly.
  • this assembly receives, adjacently to each end portion, a respective finishing annular cap 60, which is attached to said assembly by adequate means, for example by riveting or screwing, providing the axial locking of the rotor cover 40 to the rotor core 10 and magnet elements 20, protecting the adjacent end edge of said rotor cover 40 and also providing a determined and adequate mechanical rigidity to the rotor cover 40.
  • the finishing annular cap 60 has, for example, a radial extension which is defined in such a way as to cover at least the adjacent radially internal end edge of the rotor cover 40 and which may be extended up to the adjacent external end edge of said rotor cover 40.
  • the use of the retaining layer object of the present invention allows the rotor cover 40 to be less massive and consequently of simpler production, as compared to the conventionally used covers (metallic covers, coiled covers , etc . ) .

Landscapes

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

Abstract

La présente invention concerne un rotor de moteur électrique et son procédé de fabrication, le rotor comprenant un noyau de rotor (10) dans la face latérale (11) duquel des éléments d'aimant (20) sont calés et maintenus par une couche de retenue (30) faite d'un matériau adhésif. Le module élastique du matériau adhésif est normalement inférieur au plus faible module élastique de toutes les pièces du rotor du noyau (10) et des éléments d'aimant (20). Une enveloppe de rotor (40) faite d'un matériau thermo-rétrécissable est disposée autour des éléments d'aimant (20). Cette enveloppe peut en outre entourer, par l'intermédiaire de flasques annulaires d'extrémité (41) les faces d'extrémité des éléments d'aimant (20), mais aussi les faces annulaires d'extrémité (12) du noyau de rotor (10). Des cales d'épaisseur (50) peuvent même être disposées au niveau de la couche de retenue (30) de façon à lui garantir une épaisseur minimale, et, de par les caractéristiques du matériau adhésif, permettre d'absorber les déformations d'origine thermique résultant du fonctionnement du moteur électrique.
PCT/BR1998/000078 1998-09-02 1998-09-02 Rotor de moteur electrique et procede de fabrication WO2000014859A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/BR1998/000078 WO2000014859A1 (fr) 1998-09-02 1998-09-02 Rotor de moteur electrique et procede de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BR1998/000078 WO2000014859A1 (fr) 1998-09-02 1998-09-02 Rotor de moteur electrique et procede de fabrication

Publications (1)

Publication Number Publication Date
WO2000014859A1 true WO2000014859A1 (fr) 2000-03-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR1998/000078 WO2000014859A1 (fr) 1998-09-02 1998-09-02 Rotor de moteur electrique et procede de fabrication

Country Status (1)

Country Link
WO (1) WO2000014859A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1427088A2 (fr) * 2002-12-03 2004-06-09 Toyoda Koki Kabushiki Kaisha Moteur électrique avec un rotor à aimants permanents collés
EP1376826A3 (fr) * 2002-06-17 2005-01-19 Minebea Co., Ltd. Rotor pour un moteur et procédé de fabrication de celui-ci
DE102006056875A1 (de) * 2006-12-01 2008-06-12 Siemens Ag Permanentmagnetrotor mit mittels einer Klebefolie verschlossenen Aufnahmetaschen für die Permanentmagnete
JP2012070585A (ja) * 2010-09-27 2012-04-05 Keihin Corp 回転電機用ロータ
JP2014050126A (ja) * 2012-08-29 2014-03-17 Ihi Corp 永久磁石電動機、ロータ構造体、および、ロータ構造体の製造方法
WO2016067932A1 (fr) * 2014-10-29 2016-05-06 Ｋｙｂ株式会社 Rotor ainsi que procédé de fabrication de celui-ci
WO2019003802A1 (fr) * 2017-06-29 2019-01-03 日本電産株式会社 Rotor, moteur, et procécé de production de rotor
JP2022109924A (ja) * 2016-05-25 2022-07-28 セレロトン・アクチェンゲゼルシャフト 回転子

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6035945A (ja) * 1983-08-03 1985-02-23 Yaskawa Electric Mfg Co Ltd 永久磁石形回転子の製造方法
JPH0847188A (ja) * 1994-08-04 1996-02-16 Daido Steel Co Ltd マグネットロータ
US5495658A (en) * 1993-07-16 1996-03-05 Sanden Corp. Method of making cylindrical ferromagnetic body and cover assembly for rotor of DC motor
US5734216A (en) * 1994-11-29 1998-03-31 Nissan Motor Co. Ltd. Magnet rotor for synchronous motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6035945A (ja) * 1983-08-03 1985-02-23 Yaskawa Electric Mfg Co Ltd 永久磁石形回転子の製造方法
US5495658A (en) * 1993-07-16 1996-03-05 Sanden Corp. Method of making cylindrical ferromagnetic body and cover assembly for rotor of DC motor
JPH0847188A (ja) * 1994-08-04 1996-02-16 Daido Steel Co Ltd マグネットロータ
US5734216A (en) * 1994-11-29 1998-03-31 Nissan Motor Co. Ltd. Magnet rotor for synchronous motor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 159 (E - 326)<1882> 4 July 1985 (1985-07-04) *
PATENT ABSTRACTS OF JAPAN vol. 96, no. 6 28 June 1996 (1996-06-28) *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1376826A3 (fr) * 2002-06-17 2005-01-19 Minebea Co., Ltd. Rotor pour un moteur et procédé de fabrication de celui-ci
EP1427088A3 (fr) * 2002-12-03 2006-01-11 Toyoda Koki Kabushiki Kaisha Moteur électrique avec un rotor à aimants permanents collés
US7116026B2 (en) * 2002-12-03 2006-10-03 Toyoda Koki Kabushiki Kaisha Adhesion structure for motor, having thickness determining means
EP1427088A2 (fr) * 2002-12-03 2004-06-09 Toyoda Koki Kabushiki Kaisha Moteur électrique avec un rotor à aimants permanents collés
DE102006056875B4 (de) * 2006-12-01 2017-04-06 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Permanentmagnetrotor mit mittels einer Klebefolie verschlossenen Aufnahmetaschen für die Permanentmagnete
DE102006056875A1 (de) * 2006-12-01 2008-06-12 Siemens Ag Permanentmagnetrotor mit mittels einer Klebefolie verschlossenen Aufnahmetaschen für die Permanentmagnete
US8324778B2 (en) 2006-12-01 2012-12-04 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Permanent magnet rotor with accommodating pockets, sealed by means of an adhesive film, for the permanent magnets
JP2012070585A (ja) * 2010-09-27 2012-04-05 Keihin Corp 回転電機用ロータ
JP2014050126A (ja) * 2012-08-29 2014-03-17 Ihi Corp 永久磁石電動機、ロータ構造体、および、ロータ構造体の製造方法
WO2016067932A1 (fr) * 2014-10-29 2016-05-06 Ｋｙｂ株式会社 Rotor ainsi que procédé de fabrication de celui-ci
JP2016092861A (ja) * 2014-10-29 2016-05-23 Ｋｙｂ株式会社 ロータ及びロータ製造方法
CN107078612A (zh) * 2014-10-29 2017-08-18 Ｋｙｂ株式会社 转子以及转子制造方法
US10411569B2 (en) 2014-10-29 2019-09-10 Kyb Corporation Rotor and rotor manufacturing method
JP2022109924A (ja) * 2016-05-25 2022-07-28 セレロトン・アクチェンゲゼルシャフト 回転子
JP7361151B2 (ja) 2016-05-25 2023-10-13 セレロトン・アクチェンゲゼルシャフト 回転子
WO2019003802A1 (fr) * 2017-06-29 2019-01-03 日本電産株式会社 Rotor, moteur, et procécé de production de rotor

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