EP1964240A1 - Rotor d'une machine électrique, notamment d'un moteur, et procédé pour fabriquer un rotor - Google Patents

Rotor d'une machine électrique, notamment d'un moteur, et procédé pour fabriquer un rotor

Info

Publication number
EP1964240A1
EP1964240A1 EP06807192A EP06807192A EP1964240A1 EP 1964240 A1 EP1964240 A1 EP 1964240A1 EP 06807192 A EP06807192 A EP 06807192A EP 06807192 A EP06807192 A EP 06807192A EP 1964240 A1 EP1964240 A1 EP 1964240A1
Authority
EP
European Patent Office
Prior art keywords
rotor
fixing elements
permeability
lamella
base body
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.)
Pending
Application number
EP06807192A
Other languages
German (de)
English (en)
Inventor
Steven Andrew Evans
Tilo Koenig
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 EP1964240A1 publication Critical patent/EP1964240A1/fr
Pending 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
    • 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 rotor for electrical machines, in particular for motors, with a yoke, which comprises at least one lamination-containing laminated core, and a method for producing a rotor
  • Inverted rotors are used in brushless DC motors in the prior art. They often have separate surface magnets, which are applied to the magnetically conductive yoke. In a majority of DC motors, the magnets are glued to the outer surface of the yoke. In this case, different magnetic shapes are used, for example shells, cuboids or magnets in D-shape, which are also referred to as "loaves of bread”.
  • the inferences of the motors are either integrally formed of steel or consist of packages comprising a plurality of superimposed lamella plates.
  • auxiliary adapter made of plastic, to position the magnets during the curing of the adhesive. After completion of the curing process, the auxiliary adapters are removed.
  • fixing elements are integrated, between which the magnets are fitted or clamped. This achieves improved positioning of the magnets.
  • the fixing elements are then also made of conductive steel, so that generates a magnetic flux in the rotor which shorts the flux of the permanent magnets. This reduces the overall flow and reduces the torque of the machine, especially the DC motor.
  • the rotor according to the invention for electrical machines with a conclusion with the features of claim 1 has the advantage that the integrated on a main body of a fin of the yoke fixing have a very low permeability. Between two adjacent fixing elements is a respective
  • Permanent magnet provided, which is held by the fixing of one or more fins.
  • the fixing elements have a lower permeability than the main body of the lamella. This prevents a short-circuit leakage flux path between two adjacent permanent magnets in the fixing elements being formed. No magnetic flux can form in the fixing elements. This increases the total usable magnetic flux in the rotor and increases the torque of the electric machine.
  • the blade is formed of a two-state material.
  • a so-called YEP-FAl material is advantageously used. This material makes it possible to realize areas with different permeabilities. This is necessary, since the lamella consists of a base body and integral fixing elements. The lamella thus has a uniform material. Consequently, the material must be able to assume different states.
  • the material of the lamella comprises iron, chromium and carbon as components. In particular, 17.5% by volume of chromium and 0.5% by volume of carbon are used in combination with the iron. Such a material is particularly suitable because it assumes a high relative permeability in the magnetic state.
  • the lamella has a permeability of greater than 500, preferably from about 900.
  • the preferred material of the lamella has the following magnetic properties in the magnetic state.
  • the flux density is 1.28 Tesla at a magnetic field strength of 5 kA / m.
  • the coercivity is about 500 A / m.
  • the mechanical properties of this two-state material in the magnetic state include a tensile strength of 770 MPa, a yield stress of 640 MPa, and a
  • the fixing elements of the slats are heat treated. This reduces the permeability of the fixing elements.
  • the local heat treatment of the material or the lamella leads to the fact that the high permeability of the lamella at the heated places is significantly reduced.
  • the heat treatment of the fixing elements of the slats can either be done successively for each slat. In this case, a fixing element of a blade is heated one after the other. It is also possible to heat all or more fixing elements of a lamella at the same time.
  • the fixing elements preferably have a permeability of less than or equal to 1.01.
  • the permeability of the fixing preferably corresponds to that of air.
  • the heat treatment it is possible to create regions in the two-state material whose permeability is less than or equal to 1.01, with other regions having a relative permeability in the region of 900.
  • the rotor is constructed so that the permanent magnets are arranged on the circumference of the rotor.
  • the permanent magnets are held between two adjacent fixing elements.
  • the lamella preferably has a substantially rectangular or square cross-section. At the outsides are the magnets arranged.
  • the fixing elements are integrated at the corners.
  • an electric machine with the rotor according to the invention is formed with a return path, which comprises at least one lamination-containing laminated core.
  • a return path which comprises at least one lamination-containing laminated core.
  • Such an electrical machine in particular a motor, has the advantage that the permanent magnets arranged on the circumference of the return path are clamped and held between the integrated fixing elements of the lamellae. Since no magnetic flux flows between two adjacent permanent magnets through the fixing element of the blade enclosed by the permanent magnets, the total usable flux of the rotor of the electric machine is greater, so that the torque of the machine is improved. The reason for this are the non-magnetic fixing elements, between which the permanent magnets are arranged.
  • the method for producing a rotor having a plurality of lamellae with a base body and fixing elements integrated on the base body has the advantage that the permeability of the fixing elements is reduced by heat treatment until its permeability corresponds to that of air.
  • the fixing elements are non-magnetic.
  • the fixing elements thus have no influence on the magnetic flux which is formed between adjacent permanent magnets.
  • a two-state material is used, from which the lamellae consist.
  • a first step at least one of the fixing elements of the slats is now heat-treated.
  • the heat treatment happens spatially limited.
  • the main body of the lamella is not heat treated.
  • known methods can be used.
  • the fixing elements can be placed in an oven, acted upon by external heat radiation or heated in any other known manner. The heating takes place only locally, so that only the fixing elements change their permeability.
  • the fixative demente are heated until they have a permeability of about 1. Make sure that the permeability is less than or equal to 1.01, so the permeability of the fixing elements corresponds to that of air.
  • the permeability of the body is not changed during the local heat treatment. Thus, the body itself has a high permeability.
  • the slats or the fixing elements are cooled.
  • FIG. 1 shows a blade of a rotor for an electrical machine
  • Figure 2 is a rotor consisting of a plurality of laminations having laminated cores
  • FIG. 3 shows the rotor from FIG. 2 with fixed permanent magnets
  • Figure 4 is a section through a motor with the rotor of Figure 3.
  • Figure 5 shows a detail of the motor of Figure 4 with magnetic field lines.
  • FIG. Figure 1 shows a blade 1 with an im
  • Essentially square base body 2 In the middle of the base body 2, a bore 3 is provided, through which extends the motor shaft, not shown. At each corner, the lamella has a fixing element 4, which is integrally connected to the base body 2 of the lamella 1.
  • the fixing element 4 is designed as a spring tongue.
  • the slat 1 is produced by punching in one operation.
  • the lamella 1 can be produced with the integrated fixing elements 4 also by laser cutting or another known manufacturing method. Two adjacent fixing elements 4 are facing each other and form a couple. In FIG. 1, the upper and lower fixing elements 4 face each other.
  • the lamella 1 consists of a two-state material.
  • the base body 2 is magnetic and has a permeability in the range of 900.
  • the fixing elements 4 are non-magnetic after heat treatment. The permeability of the fixing elements 4 is in the range of 1.
  • FIG. 2 shows a conclusion 5 of a rotor 13, which consists of two laminated cores 6.
  • the laminated cores 6 of the yoke 5 are each composed of a plurality of laminated lamellae 1. In each case, six fins 1 form a partial package 16.
  • the laminated core 6 is assembled from several sub-packages 16, wherein two sub-packages 16 are offset by 90 degrees from each other. Due to the twist angle of 90 degrees, the shape shown in Figure 2 of the rotor 13 according to the invention is generated. Due to the structure of the laminated core 6 of several each 90 degrees against each other twisted sub-packages 16 production-related and systematic thicknesses and shape tolerances of the slats 1 are compensated.
  • FIG. 3 shows the rotor 13 according to the invention with the yoke 5 and permanent magnets 7 arranged on the outer sides of the lamellae 1.
  • the permanent magnets 7 have a D-shaped cross section. They thus have the shape of a "loaf of bread.” With their base side 8, the permanent magnets 7 lie on the outside of the laminated cores
  • the permanent magnets 7 are fixed between the adjacent fixing elements 4 and can not be moved out of their position. In addition, the permanent magnets 7 can be held with an adhesive to the laminated core 6. As a rule, however, the fixation is sufficient due to the fixing elements 4 designed as spring tongues.
  • FIG. 4 shows a cross section through a motor 9 with the rotor 13 according to the invention.
  • the motor 9 has a stator 10 with six pole shoes 11. In this way, a 4-pole, 3-phase brushless motor 9 can be produced.
  • the rotor 13 is arranged in the center of the stator 10. Shown is in the cross section of Figure 4, a blade 1 of the rotor 13. In the middle of the blade 1, a motor shaft 12 is inserted.
  • FIG. 5 shows a section of the motor 9 from FIG. 4. In this case, two pole shoes 11 are shown which belong to the stator 10. The rotor 13 of the motor 9 is rotated so that the fixing element 4 is located between the two pole pieces 11.
  • a free end 14 of the fixing element 4 of the uppermost slat 1 of the sub-package 16 lying underneath can also be seen.
  • the two partially shown permanent magnets 7 are applied to the outside of the blade 1.
  • the permanent magnets 7 are held between each two fixing elements 4.
  • Fixing elements 4 after the heat treatment have a permeability of about 1 and are non-magnetic, form no flux lines of the magnetic field in the fixing element 4.
  • the flux lines extend from the first pole piece 11 via a rotor air gap 15 formed between rotor 13 and stator 10 through the permanent magnet 7.
  • the flux lines then proceed through the main body 2 to the adjacent permanent magnet 7, via the rotor air gap 15 into the next pole piece 11 no short-circuit stray flux paths in the fixing element 4.
  • the engine 9 has an increased torque compared to a conventional engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

La présente invention concerne un rotor (13) pour machines électriques avec un retour (5), lequel comprend au moins un empilage de tôles (6) qui présente des lamelles (1), la lamelle (1) possédant un corps de base (2) et au moins deux éléments de fixation (4) intégrés d'une seule pièce dans le corps de base (2). Au moins un aimant permanent (7) est prévu sur le rotor (13), lequel est fixé entre deux éléments de fixation (4) d'une ou de plusieurs lamelles (1) du rotor (13). Les éléments de fixation (4) présentent une perméabilité plus faible que le corps de base (2) de la lamelle (1). L'invention concerne également un procédé de fabrication d'un rotor (13) de ce type au cours duquel, dans une première étape, au moins l'un des éléments de fixation (4) subit un traitement thermique jusqu'à ce que la perméabilité de l'élément de fixation (4) soit de 1. La perméabilité du corps de base (2) n'est pas modifiée ici. La lamelle (1) est refroidie dans une deuxième étape.
EP06807192A 2005-12-14 2006-10-12 Rotor d'une machine électrique, notamment d'un moteur, et procédé pour fabriquer un rotor Pending EP1964240A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005059587A DE102005059587A1 (de) 2005-12-14 2005-12-14 Rotor einer elektrischen Maschine, insbesondere eines Motors, und Verfahren zur Herstellung eines Rotors
PCT/EP2006/067325 WO2007068515A1 (fr) 2005-12-14 2006-10-12 Rotor d’une machine électrique, notamment d’un moteur, et procédé pour fabriquer un rotor

Publications (1)

Publication Number Publication Date
EP1964240A1 true EP1964240A1 (fr) 2008-09-03

Family

ID=37527099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06807192A Pending EP1964240A1 (fr) 2005-12-14 2006-10-12 Rotor d'une machine électrique, notamment d'un moteur, et procédé pour fabriquer un rotor

Country Status (5)

Country Link
EP (1) EP1964240A1 (fr)
JP (1) JP4878373B2 (fr)
CN (1) CN101331664B (fr)
DE (1) DE102005059587A1 (fr)
WO (1) WO2007068515A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009106569A2 (fr) * 2008-02-26 2009-09-03 Brose Fahrzeugteile Gmbh & Co. Kg, Würzburg Noyau magnétique d'un moteur électrique rotatif et procédé de fabrication
FR2928050B1 (fr) * 2008-02-26 2015-04-10 Continental Automotive France Noyau magnetique de machine electrique rotative a fuite reduite
GB2468718A (en) 2009-03-20 2010-09-22 Control Tech Dynamics Ltd Securing permanent magnets to a laminated rotor
CN102684405A (zh) * 2010-08-12 2012-09-19 许晓华 一种转子的生产工艺
DE102013215812A1 (de) 2013-08-09 2015-03-05 Bühler Motor GmbH Elektrische Maschine
DE102015215977A1 (de) * 2015-08-21 2017-02-23 Robert Bosch Gmbh Verfahren zum Herstellen eines metallischen Rotors und solch ein Rotor
CN108173399B (zh) * 2018-02-06 2019-09-10 慈溪市博宇电器有限公司 一种定子一体式压装工艺以及工装

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3507395B2 (ja) * 2000-03-03 2004-03-15 株式会社日立製作所 回転電機及びそれを用いた電動車両
DE10056036A1 (de) * 2000-11-11 2002-05-29 Bosch Gmbh Robert Anker
JP2002262533A (ja) * 2001-02-28 2002-09-13 Hitachi Ltd 永久磁石式回転電機
US6655004B2 (en) 2001-10-03 2003-12-02 Delphi Technologies, Inc. Method of making a powder metal rotor for a surface

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2007068515A1 *

Also Published As

Publication number Publication date
CN101331664A (zh) 2008-12-24
WO2007068515A1 (fr) 2007-06-21
JP4878373B2 (ja) 2012-02-15
JP2009519695A (ja) 2009-05-14
DE102005059587A1 (de) 2007-07-05
CN101331664B (zh) 2012-12-12

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