EP0374524B1 - Kernblechpaar und Kernpaket für Manteltransformatoren - Google Patents

Kernblechpaar und Kernpaket für Manteltransformatoren Download PDF

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Publication number
EP0374524B1
EP0374524B1 EP89121755A EP89121755A EP0374524B1 EP 0374524 B1 EP0374524 B1 EP 0374524B1 EP 89121755 A EP89121755 A EP 89121755A EP 89121755 A EP89121755 A EP 89121755A EP 0374524 B1 EP0374524 B1 EP 0374524B1
Authority
EP
European Patent Office
Prior art keywords
core
core laminations
paired
stamped
laminations
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
EP89121755A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0374524A1 (de
Inventor
Ulrich Dipl.-Ing. Sobottka
Werner Wagner
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.)
MAGNETEK MAY & CHRISTE GMBH
Original Assignee
Magnetek May & Christe 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 Magnetek May & Christe GmbH filed Critical Magnetek May & Christe GmbH
Publication of EP0374524A1 publication Critical patent/EP0374524A1/de
Application granted granted Critical
Publication of EP0374524B1 publication Critical patent/EP0374524B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to a pair of core sheets for sheathed core transformers, in particular with E and I core sheets, which are stamped so that they are inseparable in one plane by positive engagement by locking the I core sheets with the outer legs of the E core sheets together , and a shell core sheet package from such core sheet pairs.
  • Waste-free punchable EI core sheets according to DIN are known. These core sheets are either nested alternately to form a finished core sheet package, or E-core packages and I-core packages are formed, which are butted together and welded together. It is not possible to lock these core sheets. This means that one of the aforementioned complex manufacturing processes is required for the assembly of the core packages.
  • the punched step reaches into the window of the E-core sheet and thus significantly reduces the dimensions of the window. This reduces the performance of the transformer with this core cut compared to a core cut of the same volume without this window narrowing.
  • the core laminated core is notched so far that widening of the legs of the E core laminate is necessary so that the magnetic flux can pass through the magnetic circuit undisturbed. This also leads to reduced performance per unit volume compared to a transformer with core sheets stamped without waste.
  • the bolt in the form of an I-plate but must have a special geometry that is not stamped out of the E-core sheet without waste.
  • DE 21 44 951 A1 discloses two-part transformer sheets for jacket transformers which can be snapped together.
  • a geometry that cannot be stamped without waste is selected, locking lugs being designed such that the two parts snap into one another in the form of an EI, UT or UE by undercuts.
  • JP-A-61-121 308 describes the production of a sheet metal core from E-shaped stamped sheet metal parts. Noses formed by an E-plate on the outer legs snap into the center in grooves formed on another E-plate. The E-sheets are not stamped without waste.
  • the invention has for its object to provide core sheet pairs of the type described above, which can be stamped without waste in the DIN-compliant geometry, allow the use of all DIN-compliant components such as coil formers, foot brackets etc. and, in addition to the economical manufacturing process of punching, also an optimal assembly of the Enable E and I core packages.
  • E and I core sheets with the outer legs of the E core sheets can also be connected to one another by frictional engagement, in that the E core sheets at least one stamped groove on the end faces of their outer legs and the I core sheets at least have two punched locking cams which can be received in the grooves.
  • the grooves are expediently offset from the central longitudinal axes of the outer legs.
  • the punched-in notches of the I-core sheets can correspond to the punched-in notches in the outer legs or opposite one another in the middle leg of the E-core sheets.
  • the depth t of the notches is advantageously less than or equal to one fifth of the width b of the outer legs of the E-core sheets.
  • Desired punching holes are expediently designed in accordance with the geometry of the grooves of the E-core sheets for the punching process.
  • the width b2 of the locking cams is advantageously larger, preferably about 0.5% larger than the width b1 of the grooves and the distance a2 between the outer flanks of two locking cams is larger, preferably about 0.5% larger than the distance a1 between the outer walls of two corresponding grooves.
  • At least one flank of each locking cam can be brought into frictional contact with at least one side wall of the corresponding groove to about 60% to 70% of the groove depth c 1.
  • the punched locking cams of the I-core sheet are thus designed such that by inserting this I-core sheet into the associated grooves on the end face of the E-core sheet, the outer legs of this E-core sheet are slightly spread apart.
  • the locking cam is designed so that its outer contour is slightly larger than the groove in the E-core sheet, which leads to clamping via friction locking of the locking cams in the groove.
  • the jacket core sheet core package made of core sheet pairs according to the invention is advantageously constructed such that the E core sheets are combined to form an E core package and the I core sheets to form an I core package, and that the E core package and the I core package are non-positively joined together are.
  • a transformer with E and I core sheets according to the invention can thus be manufactured according to the invention with simple aids such that a pre-packaged E-core packet and a pre-packaged I-core packet snap into one another.
  • the positive and non-positive interlocking E and I core packages ensure a safe transition of the field lines from the E core package to the I core package.
  • the notches in the E-core sheet are in turn dimensioned so that it is only in operation of the transformer negligible disturbances of the magnetic flux in the area of the notches occur.
  • the dimensions of the standardized EI sheets according to DIN are observed; the coil formers, fastening elements, etc. according to DIN can thus also be used in a transformer according to the invention.
  • E-core sheets 1 and I-core sheets 2 are punched without waste.
  • 2 locking cams 4 are punched onto the I-core sheets during the punching process and, at the same time, notches 3 are punched into the E-core sheets 1.
  • each E-core sheet has two outer legs 6 and 7 and a stamped-in groove 5 on the end faces of the outer legs 6 and 7.
  • the E and I core sheets 1, 2 are stamped so that they can be connected inseparably in one plane by frictional engagement after stamping in one plane.
  • the locking cams 4 are designed such that they can be frictionally received in the grooves 5.
  • punching holes 8 in the sheet metal strip are required for the punching process. These transport holes 8 are designed so that they correspond to the geometry of the grooves 5 of the E-core sheets 1, as is required for the later positive connection.
  • E- and I-core packages are constructed as shown in FIG. 1.
  • the I-core package comes under pressure in a non-positive connection with the E-core package and snaps so to speak in this one.
  • the distance a2 between the outer flanks of the two locking cams 4 is approximately 0.5% larger than the distance a1 between the outer walls of the two corresponding grooves.
  • the locking cams 4 of the I-core sheet 2 are shaped so that their width b2 with which they engage in the groove 5 of the E-core sheet 1 by about 0.5% larger than the width b1 this Nut 5 is. This causes a slight spreading of the groove 5. This causes the locking cam 4 to become jammed and the E-core sheet 1 is firmly connected to the I-core sheet 2 by friction.
  • the geometry of the locking cam 4 is selected so that the side wall of the groove 5 is contacted at least over 60% to 70% of the groove depth c 1 over a length c from the flank of the locking cam 4 .
  • notches 9 in the middle leg of the E-core sheet are punched directly opposite and without waste.
  • the effects described above are used to the same extent.
  • the notches 3 and 9 are chosen so that their depth t is less than or equal to one fifth of the width b of the outer legs 6 or 7 (Fig. 1).
  • the medial leg width 2b of the E core sheets 1 is twice that Width b of the outer legs 6 and 7.
  • the E and I core sheets 1, 2 that snap into one another, so to speak, are advantageously punched in the dimensions according to DIN. This allows standardized bobbins and fasteners to be used directly. In addition, of course, other E and I geometries, which are punched differently from the standard, can also be implemented.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP89121755A 1988-12-20 1989-11-24 Kernblechpaar und Kernpaket für Manteltransformatoren Expired - Lifetime EP0374524B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3842885 1988-12-20
DE3842885A DE3842885C1 (enrdf_load_stackoverflow) 1988-12-20 1988-12-20

Publications (2)

Publication Number Publication Date
EP0374524A1 EP0374524A1 (de) 1990-06-27
EP0374524B1 true EP0374524B1 (de) 1994-03-30

Family

ID=6369634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89121755A Expired - Lifetime EP0374524B1 (de) 1988-12-20 1989-11-24 Kernblechpaar und Kernpaket für Manteltransformatoren

Country Status (2)

Country Link
EP (1) EP0374524B1 (enrdf_load_stackoverflow)
DE (2) DE3842885C1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254964A (en) * 1991-03-26 1992-10-21 Scott & Co Ltd Geo Transformer core assembly
SI20600A (sl) * 2000-06-01 2001-12-31 Iskraemeco Postopek za izdelovanje ločljivo sestavljenega lameliranega paketa za napetostno jedro indukcijskega električnega števca iz lameliranih delnih paketov
JP5494612B2 (ja) 2011-10-18 2014-05-21 株式会社豊田自動織機 磁性コア、及び誘導機器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0353029A2 (en) * 1988-07-27 1990-01-31 Linton And Hirst Limited Improvements in laminations

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1345523A (en) * 1970-09-10 1974-01-30 Friedland Ltd V E Doggart J Sk Transformer laminations
DE2139010A1 (de) * 1971-08-04 1973-03-08 Kammeyer Karl Geteilter kernblechschnitt fuer transformatoren
LU65764A1 (enrdf_load_stackoverflow) * 1971-08-04 1972-11-28
DE2920365A1 (de) * 1979-05-19 1980-11-27 Philberth Karl Dr Phys Kernblech fuer mantelkerne, insbesondere fuer transformatoren
DE3118465A1 (de) * 1981-05-09 1982-11-25 Bruno 8550 Forchheim Waasner Zweiteiliges kernblech, insbesondere fuer drosseln
DE3318370C2 (de) * 1983-05-20 1986-02-06 Waasner, Bruno, 8550 Forchheim Blechkern aus zwei Teilen und mit drei Schenkeln

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0353029A2 (en) * 1988-07-27 1990-01-31 Linton And Hirst Limited Improvements in laminations

Also Published As

Publication number Publication date
EP0374524A1 (de) 1990-06-27
DE58907347D1 (de) 1994-05-05
DE3842885C1 (enrdf_load_stackoverflow) 1990-04-26

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