EP0580131B1 - Verfahren zur Herstellung einer Drossel oder eines Transformators mit aus zwei U-förmigen Blechen gebildeten E-förmigen Kernblechen - Google Patents

Verfahren zur Herstellung einer Drossel oder eines Transformators mit aus zwei U-förmigen Blechen gebildeten E-förmigen Kernblechen Download PDF

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Publication number
EP0580131B1
EP0580131B1 EP93111617A EP93111617A EP0580131B1 EP 0580131 B1 EP0580131 B1 EP 0580131B1 EP 93111617 A EP93111617 A EP 93111617A EP 93111617 A EP93111617 A EP 93111617A EP 0580131 B1 EP0580131 B1 EP 0580131B1
Authority
EP
European Patent Office
Prior art keywords
shaped
core
shaped plates
plates
transformer
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.)
Expired - Lifetime
Application number
EP93111617A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0580131A3 (enrdf_load_stackoverflow
EP0580131A2 (de
Inventor
Jakob Marti-Hefti
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.)
Knobel AG Lichttechnische Komponenten
Original Assignee
Knobel AG Lichttechnische Komponenten
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 Knobel AG Lichttechnische Komponenten filed Critical Knobel AG Lichttechnische Komponenten
Publication of EP0580131A2 publication Critical patent/EP0580131A2/de
Publication of EP0580131A3 publication Critical patent/EP0580131A3/xx
Application granted granted Critical
Publication of EP0580131B1 publication Critical patent/EP0580131B1/de
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets

Definitions

  • the invention relates to a method for producing core sheets according to the preamble of claim 1. Such a method is known from DE-C-3402036. Furthermore, the invention relates to a method for producing the choke or the transformer from such core sheets.
  • Chokes e.g. Chokes for fluorescent lamp ballasts and transformers, e.g. Low-power transformers for low-voltage halogen lamps, with E-shaped core sheets and I-shaped backing sheets are known, e.g. from EP-B-24 319.
  • the core sheet material assembled in strips has significantly more favorable magnetic properties in the longitudinal direction (rolling direction) than in the transverse direction of the strip. It is therefore desirable that the legs of the E-shaped core sheet lie in the longitudinal direction of the sheet metal strip during punching. Furthermore, it should of course be possible to punch without waste. These requirements are not readily given together in the known E-sheets or in the known transformers and chokes made from such E-sheets. Thus, in the method according to EP-B-24 319, punching is essentially without waste, but the E-legs are punched out of the core sheet metal strip at right angles to the rolling direction thereof. Chokes or transformers manufactured accordingly therefore do not have the optimally possible magnetic properties of the core sheet stack, since only approx. 30% of the sheet area of each e-sheet lies in the rolling direction of the sheet material.
  • the invention is therefore based on the object of providing a method for producing core sheets for a choke or a transformer, the core sheet core of which is easy to punch individual core sheets can have improved magnetic properties.
  • FIG. 1 shows a vertical cross section through the laminated core of a transformer.
  • Two essentially U-shaped core sheets 2, 3 are provided. Each U-shaped sheet has a web 16 or 17 and a longer U-leg 12 or 13 and a shorter U-leg 14 or 15.
  • the two U-shaped core sheets 2, 3 are with their shorter legs 14, 15 arranged adjacent to each other, so that the two U-shaped core sheets together form an E-shaped core sheet, ie the two short U-legs 14, 15 together form the middle leg of the E-sheet, the long U-legs form the other two E-leg.
  • the transformer laminated core is completed by the I-shaped return plate 4.
  • the windings of the transformer are arranged in a known manner in the two winding spaces 5, 6 thus formed.
  • projections 7, 8 are provided, to which a base plate (not shown) for the transformer is fastened in a known manner.
  • the width of the yoke plate 4 is preferably greater than the length difference between the long leg and the short leg of each U-shaped plate. This results in a protrusion of the yoke plate 4 over the longer leg 12 or 13 of the U-shaped plate.
  • the corresponding projection is designated by the number 9 in FIG.
  • the protrusion of the yoke plate 4 results in a good pressure of the yoke plate 4 against the short legs 14, 15 of the U-shaped plates, or on the middle leg of the resulting E-shaped plate, through the base part of the transformer fastened to the projections 7, 8.
  • the U-shaped plates 2, 3 are fastened to one another. This attachment is preferably done by welding, for example by laser welding or by roller seam welding. The welding is preferably carried out on the side of the transformer facing away from the return plate 4 at the joint of the two plates.
  • a recess 20 can be provided on one of the associated U-shaped sheets, which thus forms a channel running in the longitudinal direction of the entire sheet stack of the transformer, in which the welding, in particular the laser welding, is carried out.
  • recesses can also be provided on the two metal sheets 2, 3 that belong to one another, or recesses can be dispensed with, for example in the case of roller seam welding.
  • the base plate can preferably be dispensed with if the I-shaped laminated core is welded to the E-shaped laminated core formed from the two U-shaped laminated core at two points 9 in the longitudinal direction of the laminated core.
  • the laminated core for a choke can also be formed in the same way.
  • an insert made of non-magnetic material is provided between the middle leg of the E-shaped laminated core and the return plate 4 in order to form an air gap.
  • This insert can be formed, for example, in a known manner from a spacer element arranged at point 10 and extending in the longitudinal direction of the throttle.
  • a flat insert, for example an aluminum strip, which covers the middle leg of the e-sheet can also be provided.
  • the air gap after installing the throttle be precisely adjusted by exerting pressure on the base plate.
  • FIG. 2 shows an arrangement of the two U-shaped sheets 2, 3 for their waste-free punching from a sheet metal strip.
  • two U-shaped sheets 2, 3 are arranged such that the short leg 15 of one sheet 3 extends between the long leg 12 and the short leg 14 of the other sheet.
  • the distance between the U-legs or the web 16, 17 of each U-plate corresponds to the width of the short U-legs 15, 14 of each plate.
  • the arrangement shown, each of two U-sheets nested one inside the other, results in essentially waste-free punching.
  • the legs 12, 13, 14, 15 of the U-sheets are arranged on the core sheet strip or punched out of it in such a way that the legs point in the rolling direction of the core sheet material.
  • the I-shaped yoke plate can be provided on the side of the nested U-shaped plates for punching.
  • the width of the I-shaped sheet can be varied independently of the width of the legs 12, 13, 14, 15 without the essentially waste-free stamping process being impaired.
  • other options for punching the U-shaped sheets are also possible.
  • the U-shape facilitates the possibility that the stamping is always carried out in such a way that the U-legs point in the rolling direction of the sheet metal material in order to take advantage of the better magnetic properties which result in this way.
  • Figure 3 shows a preferred punch arrangement of eight nested U-plates and Yoke plates arranged laterally offset from one another. In this way, a large number of U-sheets and associated I-sheets can be punched out of a strip of core sheet material without waste.
  • the punched-out U-plates to be connected to one another are brought together in that the U-plates are each suspended from rails and possibly guided in channels to form an E-shaped plate stack which is formed in the desired length.
  • the U-shaped sheets are then releasably fixed in the E-shape by a holding device and are definitely connected to one another at least along an abutment or abutment line by welding or in some other way.
  • the transformer or the choke is then finished in a known manner by attaching the windings, the yoke plate and the base plate and by subsequent impregnation and fastening of connection elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Electromagnets (AREA)
EP93111617A 1992-07-20 1993-07-20 Verfahren zur Herstellung einer Drossel oder eines Transformators mit aus zwei U-förmigen Blechen gebildeten E-förmigen Kernblechen Expired - Lifetime EP0580131B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH228492 1992-07-20
CH2284/92 1992-07-20

Publications (3)

Publication Number Publication Date
EP0580131A2 EP0580131A2 (de) 1994-01-26
EP0580131A3 EP0580131A3 (enrdf_load_stackoverflow) 1994-03-23
EP0580131B1 true EP0580131B1 (de) 1995-11-08

Family

ID=4230175

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93111617A Expired - Lifetime EP0580131B1 (de) 1992-07-20 1993-07-20 Verfahren zur Herstellung einer Drossel oder eines Transformators mit aus zwei U-förmigen Blechen gebildeten E-förmigen Kernblechen

Country Status (4)

Country Link
EP (1) EP0580131B1 (enrdf_load_stackoverflow)
AT (1) ATE130119T1 (enrdf_load_stackoverflow)
DE (1) DE59300886D1 (enrdf_load_stackoverflow)
ES (1) ES2079925T3 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07297055A (ja) * 1994-04-26 1995-11-10 Matsushita Electric Ind Co Ltd チョークコイル
US6975049B2 (en) 2003-10-29 2005-12-13 A. O. Smith Corporation Electrical machine and method of manufacturing the same
DE102004012436B4 (de) * 2004-03-12 2006-04-20 Vossloh-Schwabe Deutschland Gmbh Kernblech für induktives Bauelement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT311485B (de) * 1969-12-09 1973-11-26 Zumtobel Walter Transformator oder Induktionsspule mit Eisenkern
ES398127A1 (es) * 1970-12-28 1974-07-16 Knobel Elektro App Nucleo magnetico en laminas para aparatos de induccion.
DE2638369A1 (de) * 1976-08-26 1978-03-02 Bernhard Philberth Eisenkern fuer transformatoren, drosseln o.dgl.
GB2048575B (en) * 1979-05-04 1983-01-26 Thorn Electrical Ind Ltd Electrical choke or transformer
DE3402036C1 (de) * 1984-01-21 1985-07-11 Schwabe GmbH & Co KG Elektrotechnische Fabrik, 7067 Urbach Verfahren zum Herstellen E-förmiger Kernbleche und I-förmiger Rückschlußbleche einer Drossel oder eines Transformators, insbesondere für Gasentladungslampen
DE3727457C2 (de) * 1987-08-18 1997-02-13 Waasner Elektrotechnische Fabr Drehstromtransformator

Also Published As

Publication number Publication date
EP0580131A3 (enrdf_load_stackoverflow) 1994-03-23
EP0580131A2 (de) 1994-01-26
ES2079925T3 (es) 1996-01-16
ATE130119T1 (de) 1995-11-15
DE59300886D1 (de) 1995-12-14

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