EP2304867A1 - Noyau de stator pour machine électrique - Google Patents

Noyau de stator pour machine électrique

Info

Publication number
EP2304867A1
EP2304867A1 EP09769143A EP09769143A EP2304867A1 EP 2304867 A1 EP2304867 A1 EP 2304867A1 EP 09769143 A EP09769143 A EP 09769143A EP 09769143 A EP09769143 A EP 09769143A EP 2304867 A1 EP2304867 A1 EP 2304867A1
Authority
EP
European Patent Office
Prior art keywords
tooth
stator core
width
groove
flank
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Withdrawn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
EP09769143A
Other languages
German (de)
English (en)
Inventor
Daniel Amaral
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 EP2304867A1 publication Critical patent/EP2304867A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
    • H02K15/026—Wound cores
    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots

Definitions

  • the invention is based on a stator core for an electric machine, as is known, for example, from US Pat. No. 3,577,851.
  • the stator core disclosed in this publication is constructed spirally in a winding process by toothing two identical strips out of a band-shaped electrical steel sheet and rolling them individually to form a stator core.
  • the two metal strips each have recesses and finger-shaped projections, which form the teeth and grooves of the stator core after the winding of the strip.
  • the publication contains no further details, as well as the amount of waste resulting from punching in relation to the size of the original sheet metal strip or the remaining Polqueriteses.
  • the stator core according to the invention with the features of the independent claim has the advantage that the used, preferably band-shaped sheet material is optimally used to the manufacturing technology and geometrically possible limit, on the one hand minimizes the sheet waste and on the other hand by the achieved maximum possible cross-section of the stator of the magnetic resistance is reduced.
  • the measures listed in the dependent claims advantageous refinements and improvements of the independent claim specified stator core are possible.
  • a ratio of tooth width to slot pitch is in the range between 0.38 and 0.48, preferably in the range between 0.40 and 0, 48th Known, manufactured in the same way stator cores are significantly lower with respect to the claimed ratio of the tooth width to slot pitch when the area between the
  • Tooth and the groove edges is punched free.
  • known designs achieve a ratio of tooth width to slot pitch of 0.5, but the entire manufacturing process and in particular the separation process of the sheets are much more difficult and the flatness of the sheets under the Separation process suffers. This results in a lower dimensional stability, which has a negative effect on the output power and the instrumentssgrat.
  • the thickness of the electric sheet used is taken into account in the choice of the punching width on the tooth flank and the groove flank, wherein preferably the width of the punched-out region along the tooth flank and the groove flank is at least 20% greater than that Sheet thickness of the slats. In this way it is ensured that with larger sheet thicknesses, the width of the punched-out area is chosen sufficiently large, so that the burrs resulting from the material deformation during punching do not exceed a critical size.
  • the thickness of the electrode used in the proposed design of the stator core is expediently in the range between 0.3 and 1.2 mm, preferably in the range between 0.5 and 1.0 mm.
  • FIG. 1 shows a toothed sheet cut before the two sheet metal strips are separated
  • Figure 2 shows a section of a rolled or bent into its round shape stator core with inserted groove insulation
  • FIG. 2 a shows an enlarged view of a section from FIG. 2 in the region of the groove base with the projections of the sheet metal section remaining there.
  • denoted by 10 is a strip of electrical steel, which is partly divided by free punching and partly by cutting into two mutually toothed individual strips 12 and 14.
  • the band 10 consists of a soft magnetic, suitable for the production of a stator core electrical sheet, as defined for example in DIN 46 400 and is basically known. Essential criteria of such sheets are a coercive force below 1000 A / m, suitable alloying additives, in particular of Si, Ni, Co, Mo and others, as well as special treatments such as hot or cold rolling, whereby on the one hand favorable soft magnetic properties and on the other hand advantageous processing conditions are obtained.
  • mirror-inverted individual belts are produced as lamellae 12 and 14, which have pole-like projections 16 and groove-like recesses 18.
  • the separation is carried out such that the area between adjacent tooth flanks 20 and groove flanks 22 is punched free in a width B.
  • the punching length L corresponds to the distance between the inner edges 24 of the pole shoes 26.
  • This part of the slats 12 and 14 is less critical with respect to the slightly more formed ridges when cutting against punching, as it is covered by the later introduced slot insulation 42 and is less stressed during retraction of the coil 46 into the grooves 40, so that the risk Damage to the groove and / or conductor insulation hardly exists in this area.
  • the groove width N after the separation process in the straight state of the slats of Figure 1 relevant sizes of the laminations 12 and 14 are the groove width N after the separation process in the straight state of the slats of Figure 1, the groove depth corresponding tooth length A, the tooth width P and the slot pitch T corresponding to the distance from Nutmitte groove center.
  • the ratio ⁇ of the tooth width P to the groove pitch T greater than 0.38 and less than 0.5 is selected, wherein the ratio ⁇ is preferably between 0.40 and 0.48.
  • the lower value determines the punching width B which is advantageous for a production process that is simple to produce.
  • the upper value defines the tooth width P essential for minimizing the magnetic resistance in the tooth.
  • the dividing line during shearing in the region of the groove base is aligned in this case Substantially in extension of the free-punched edge 28 of the tooth flank 20, or the groove flank 22 extends. This results in a nearly straight transition from the bottom of the groove to the groove flank, wherein a clearly visible from Figures 2 and 2a, sharp-edged projection 34 on the groove bottom is largely avoided.
  • the width B of the punched-out area along the tooth flank 20 and the groove flank 22 is at least 20% greater than the sheet thickness d of the fins 12, 14, which in turn between 0.3 mm and 1.2 mm, preferably between 0.5 mm and 1.0 mm.
  • Figure 2 shows a slightly enlarged view of a section of a rolled or bent into its round shape stator core with teeth 39 and grooves 40 into which a slot insulation 42 is introduced, which largely conforms to the contour of the groove 42 and on the slot opening 44 the inner edge 24 of the pole piece 26 is supported.
  • the slot opening 44 is closed by a likewise on the inner edge 24 of the tooth head 26 supporting slot closure 48, so that the stator winding 45 is protected in this area against damage to the conductor insulation.
  • FIGS. 2 and in particular 2a again clearly show the course of the parting line 38, which arises during the shear cutting of the strip 10 in the region of the groove bottom 36.
  • the parting line 38 extends substantially in extension of the free-punched edge 28 of the tooth flank 20, so that only a very small protrusion 34 stops, which does not pose any risk of damage to the slot insulation, even after the introduction of the stator winding 46.

Landscapes

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

Abstract

L'invention concerne un noyau de stator pour une machine électrique, en particulier pour l'alternateur d'un véhicule automobile, formé par empilage ou enroulement de lames (12, 14) qui sont poinçonnées et/ou découpées dans une tôle électrique (10), de préférence en forme de bande, de manière à former un endentement, ces lames présentant une pluralité d'encoches (40) et de dents (39). La région du profil de dent (20) et du flanc d'encoche (22) est dégagée par découpage de telle sorte que la largeur de dent (P) et la largeur d'encoche (N) sur les lames (12, 14) non cintrées soient sensiblement constantes sur toute la longueur de dent (A), le rapport (α) entre la largeur de dent (P) et le pas dentaire (T) étant supérieur à 0,38 et inférieur à 0,5, ce qui permet d'obtenir des résistances magnétiques minimales et une réduction des déchets de tôle dans les limites possibles en termes de géométrie et de fabrication.
EP09769143A 2008-06-24 2009-06-15 Noyau de stator pour machine électrique Withdrawn EP2304867A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810002613 DE102008002613A1 (de) 2008-06-24 2008-06-24 Statorkern für eine elektrische Maschine
PCT/EP2009/057362 WO2009156294A1 (fr) 2008-06-24 2009-06-15 Noyau de stator pour machine électrique

Publications (1)

Publication Number Publication Date
EP2304867A1 true EP2304867A1 (fr) 2011-04-06

Family

ID=41064624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09769143A Withdrawn EP2304867A1 (fr) 2008-06-24 2009-06-15 Noyau de stator pour machine électrique

Country Status (5)

Country Link
EP (1) EP2304867A1 (fr)
CN (1) CN102077448A (fr)
BR (1) BRPI0914322A2 (fr)
DE (1) DE102008002613A1 (fr)
WO (1) WO2009156294A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012087156A1 (fr) 2010-12-22 2012-06-28 Fisher & Paykel Appliances Limited Appareil amélioré, moteur ou stator
JP6214951B2 (ja) 2013-07-19 2017-10-18 株式会社三井ハイテック 帯状固定子鉄心片の製造方法及びこれに用いる金型装置
JP6778497B2 (ja) * 2016-03-22 2020-11-04 株式会社三井ハイテック 積層鉄心の製造方法及びその製造装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007145471A2 (fr) * 2006-06-16 2007-12-21 Lg Electronics Inc. stator de moteur et appareil de lavage en étant équipé

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3577851A (en) 1968-03-18 1971-05-11 Lucas Industries Ltd Method of making dynamoelectric machines
AU8847582A (en) * 1981-11-06 1983-05-12 Westinghouse Electric Corporation Electric machine cores
JP3359863B2 (ja) * 1998-04-08 2002-12-24 三菱電機株式会社 固定子鉄芯の製造方法
DE10361858A1 (de) * 2003-12-30 2005-07-28 Robert Bosch Gmbh Ständer für eine elektrische Maschine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007145471A2 (fr) * 2006-06-16 2007-12-21 Lg Electronics Inc. stator de moteur et appareil de lavage en étant équipé

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009156294A1 *

Also Published As

Publication number Publication date
CN102077448A (zh) 2011-05-25
DE102008002613A1 (de) 2009-12-31
WO2009156294A1 (fr) 2009-12-30
BRPI0914322A2 (pt) 2015-10-13

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