EP0439410A2 - Magnetkernblech - Google Patents

Magnetkernblech Download PDF

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Publication number
EP0439410A2
EP0439410A2 EP91400176A EP91400176A EP0439410A2 EP 0439410 A2 EP0439410 A2 EP 0439410A2 EP 91400176 A EP91400176 A EP 91400176A EP 91400176 A EP91400176 A EP 91400176A EP 0439410 A2 EP0439410 A2 EP 0439410A2
Authority
EP
European Patent Office
Prior art keywords
intermediate formation
formation
lamina
loop
core
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Withdrawn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
EP91400176A
Other languages
English (en)
French (fr)
Other versions
EP0439410A3 (en
Inventor
Branimir Jakovljevic
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0439410A2 publication Critical patent/EP0439410A2/de
Publication of EP0439410A3 publication Critical patent/EP0439410A3/en
Withdrawn legal-status Critical Current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

  • THIS invention relates to laminated magnetic cores suitable for transformers, chokes, lighting equipment ballasts and the like.
  • a core lamina of unitary construction comprising an elongate intermediate formation and a pair of loop formations disposed on opposite sides of the intermediate formation, each loop formation extending from opposite end regions of the intermediate formation and defining with the intermediate formation an aperture through which part of at least one coil may extend, the lamina being characterised in that the intermediate formation is severed across its entire width in a zone towards one end of the intermediate formation.
  • the intermediate formation is preferably severed in a straight line substantially perpendicular to a longitudinal axis of the elongate intermediate formation and at the one end of the intermediate formation.
  • a core lamina of unitary construction comprising an elongate intermediate formation; and a pair of loop formations disposed on opposite sides of the intermediate formation, each loop formation extending from opposite end regions of the intermediate formation and defining with the intermediate formation an aperture through which part of at least one coil may extend, the intermediate formation being severed across its entire width in a zone towards one end of the intermediate formation so that the intermediate formation on the one hand and the combined or joined loop formations on the other hand are relatively displaceable transversely to a plane of the lamina in the region of the one end of the intermediate formation, thereby to permit the intermediate formation to be introduced from the one end thereof into a bore of a coil and to locate the coil round the intermediate formation with the loop formations embracing opposite regions of the coil.
  • the lamina according to this invention there is provided less limbs with free ends and only one severed zone, making the lamina less prone to permanent deformation when it is mounted in a coil assembly. Furthermore, as the severed zone is in a straight line across the entire width of the intermediate formation, the lamina according to the present invention is easier to manufacture by stamping it out of a plate of a suitable material.
  • the intermediate formation and the loop formations are preferably biased by inherent resilience of the lamina to return from the said relatively displaced positions to normal positions in which the portions of the lamina on opposite sides of the severed zone are located substantially in alignment defining an airgap therebetween.
  • the intermediate formation preferably has a substantially uniform width throughout its length and each of the loop formations has a substantially uniform width throughout its length, the width of each loop formation being substantially half the width of the intermediate formation.
  • each of the loop formations and the intermediate formation may have an elongate, substantially rectangular configuration, each loop formation embracing the associated aperture and including an elongate outer portion extending along the rectangular aperture.
  • Each loop formation preferably has rounded outer corner zones opposite corners of the said associated rectangular aperture such that the width of each loop formation is substantially uniform throughout its length.
  • each rectangular aperture may be substantially equal to the width of the loop formation and the length of the aperture preferably is at least three times the width thereof.
  • the core lamina according to the invention preferably has a lattened figure-of-eight configuration.
  • a laminated core for a transformer, choke, lighting equipment ballast or like stationary electric machine comprising a stack of superimposed core laminae as defined hereinbefore.
  • a severed zone of a lamina of the stack is sandwiched between regions of adjacent laminae which are not severed.
  • transformer, choke, lighting equipment ballast or like electric machine including a laminated core as defined in any one of the preceding two paragraphs.
  • the lamina A is of unitary construction and is stamped out of a plate of any suitable magnetic material, such as ferro-silicon steel.
  • Lamina A has a flattened figure-of-eight configuration and comprises an elongate intermediate formation 1 which has a uniform width throughout its length; and a pair of loop formations 2 which are disposed on opposite sides of the intermediate formation 1.
  • Each loop formation 2 extends from opposite ends of the intermediate formation 1 and has a substantially uniform width throughout its length.
  • Each loop formation 2 defines, together with the intermediate formation 1, an elongate rectangular aperture 3 through which part of a coil may extend.
  • Each loop formation 2 has an elongate outer portion 2.1 which extends along the associated elongate aperture 3.
  • Each loop formation has rounded outer corner zones 4 and 5 opposite the inner and outer corners 6 and 7, respectively of the associated rectangular aperture 3, so that the width of each loop formation 2 is substantially uniform throughout its length. It will be seen that at opposite ends of intermediate formation 1, the two loop formations 2 are joined to each other. Radiused indentations 8 are defined between the two loop formations 2 in the zones where they are joined at opposite ends of intermediate formation 1.
  • the intermediate formation is severed across its entire width in a position at the one end 1.1 of the intermediate formation 1 along a line 9 extending perpendicular to the longitudinal axis of the intermediate formation between opposed inner corners 6 of the apertures 3 on either side of intermediate formation 1.
  • Neither the loop formation 2, nor the intermediate formation 1 is severed in the region of the opposite end 1.2 of the intermediate formation 1, so that the loop formations 2 are fast with the intermediate formation 1 in the region of its opposite end 1.2, thereby to provide a lamina of unitary construction.
  • the width W e of the two loop formations 2 are equal to each other and are equal to half of the width W i of the intermediate formation 1.
  • the widths W a of the two apertures 3 are equal to each other and to the widths W e of the loop formation 2.
  • the lengths L a of the two apertures 3 are equal to each other and are at least three times the widths W a of the apertures 3.
  • the width W i of intermediate formation 1 and the widths W e of the two loop formations 2 are selected to suit a required power output of a transformer including a core comprising a stack of laminae similar to lamina A .
  • the lengths L a of the apertures 3 are suitably selected in relation to the widths W a of the apertures 3 so that the apertures 3 may accommodate a coil having a suitable number of turns and/or a suitable conductor cross-sectional area as required for a particular application.
  • the radiused indentations 8 have a depth D i of in the order of 55% of the width W e of the loop formations.
  • a laminated core may be produced by superimposing a plurality of similar laminae A to form a stack of laminae in registration with each other.
  • a transformer may be produced with a core comprising a stack of laminae similar to lamina A of figure 1.
  • a preformed coil assembly B of tubular configuration which comprises a primary winding 10 and a secondary winding 11, is provided.
  • a plurality of laminae A are mounted successively one after the other on the coil assembly B .
  • each lamina is mounted by transversely displacing the intermediate formation 1 on the one hand and the joined loop formations 2 on the other hand away from one another in the region of the one end 1.1 of the intermediate formation 1 of the lamina.
  • the intermediate formation 1 of the lamina is then introduced into the bore 12 of the coil assembly B from one end 13 thereof and the loop formations 2 are passed over and round the coil assembly B so that the one end 1.1 of the intermediate formation 1 protrudes from the opposite end 14 of the coil assembly B .
  • the intermediate formation 1 and the loop formations 2 are then pushed back or allowed to spring back under the influence of the inherent resilience of the material of the lamina A , from their displaced positions to their normal positions in which parts of the lamina on opposite sides of the zone 9 in which the intermediate formation 1 is severed, are located in alignment.
  • the lamina is then completely flat with opposed edges 9.1 on opposite sides of the severed zone 9 disposed in closely matching relationship to provide an airgap 9.2 of uniform and minimum width.
  • Each successive lamina may be mounted on coil assembly B as described above to form a stack 15 of superimposed laminae A which fills the bore 12 of coil assembly B .
  • the stack 15 of laminae A constitutes a laminated core for coil assembly B .
  • the intermediate formations 1 of successive laminae A be introduced into the bore 12 of coil assembly B alternately from the one end 13 of the coil assembly as shown in figure 2 and from the opposite end 14 of the coil assembly B as shown in figure 3, so that the severed zone 9 of one lamina near the one end 1.1 of its intermediate formation is sandwiched between regions of a pair of adjacent laminae which are located near the opposite ends 1.2 of the intermediate formations 1 of the adjacent laminae A and which are not severed.
  • the superimposed laminae A in the stack may be firmly clamped together in any suitable manner to provide a laminated core for the coil assembly B .
  • Upper and lower clamping plates may be provided for this purpose.
  • Bolts (also not shown) for urging the clamping plates towards one another may pass through the registering indentations 8 at the opposed ends of the stack 15.
  • the lamina A according to the invention has rounded external corner zones 4 and 5 to present a double magnetic circuit having such a configuration that it enhances the flow of magnetic flux round the two circuits and avoids or at least minimizes an escape of magnetic flux from the lamina and flux vortices in the zones where the two magnetic circuits meet towards opposite ends of the intermediate formations 1 in the zones of the indentations 8.
  • the lamina A according to the invention need not have any holes therein, for receiving clamping or securing bolts which holes are located in the flux path presented by the lamina and which tend to reduce the effective cross-sectional area of the flux path and also tend to cause flux vortices in the lamina and eddy currents in the securing bolts.
  • laminae facilitates mounting of a core on a preformed coil assembly.
  • the lamina according to the present invention which is severed in a single zone in the relatively wide intermediate formation, possible permanent deformation in the region of the severed zone after mounting of the lamina on a tubular core may be reduced and thus better alignment of the opposed edges on opposite sides of the severed zone may be achieved, to provide a single uniform airgap in the severed zone.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP19910400176 1990-01-25 1991-01-25 Laminate for magnetic core Withdrawn EP0439410A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA90540 1990-01-25
ZA900540 1990-01-25

Publications (2)

Publication Number Publication Date
EP0439410A2 true EP0439410A2 (de) 1991-07-31
EP0439410A3 EP0439410A3 (en) 1992-01-29

Family

ID=25579994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910400176 Withdrawn EP0439410A3 (en) 1990-01-25 1991-01-25 Laminate for magnetic core

Country Status (3)

Country Link
EP (1) EP0439410A3 (de)
JP (1) JPH04212403A (de)
YU (1) YU48139B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0779634A1 (de) * 1995-12-14 1997-06-18 Schneider Electric Sa Stromwandler und Verfahren zu seiner Herstellung
GB2331857A (en) * 1997-11-28 1999-06-02 Asea Brown Boveri Magnetic core assemblies
US6335673B1 (en) 1995-12-14 2002-01-01 Schneider Electric Sa Current transformer and its manufacturing process

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE510192C2 (sv) 1996-05-29 1999-04-26 Asea Brown Boveri Förfarande och kopplingsarrangemang för att minska problem med tredjetonsströmmar som kan uppstå vid generator - och motordrift av växelströmsmaskiner kopplade till trefas distributions- eller transmissionsnät
JP2000511338A (ja) 1996-05-29 2000-08-29 アセア ブラウン ボヴェリ エービー 高圧巻線用導体および前記導体を含む巻線を備える回転電気機械
PL330234A1 (en) 1996-05-29 1999-05-10 Asea Brown Boveri Electromagnetic device
BR9709371A (pt) 1996-05-29 2000-01-11 Asea Brow Boveri Ab Condutor isolado para bobinas de alta voltagem e métodos para fabricar o mesmo.
SE9602079D0 (sv) 1996-05-29 1996-05-29 Asea Brown Boveri Roterande elektriska maskiner med magnetkrets för hög spänning och ett förfarande för tillverkning av densamma
SE512917C2 (sv) 1996-11-04 2000-06-05 Abb Ab Förfarande, anordning och kabelförare för lindning av en elektrisk maskin
SE510422C2 (sv) 1996-11-04 1999-05-25 Asea Brown Boveri Magnetplåtkärna för elektriska maskiner
SE509072C2 (sv) 1996-11-04 1998-11-30 Asea Brown Boveri Anod, anodiseringsprocess, anodiserad tråd och användning av sådan tråd i en elektrisk anordning
SE515843C2 (sv) 1996-11-04 2001-10-15 Abb Ab Axiell kylning av rotor
SE9704423D0 (sv) 1997-02-03 1997-11-28 Asea Brown Boveri Roterande elektrisk maskin med spolstöd
SE508543C2 (sv) 1997-02-03 1998-10-12 Asea Brown Boveri Hasplingsanordning
SE9704431D0 (sv) 1997-02-03 1997-11-28 Asea Brown Boveri Effektreglering av synkronmaskin
SE508544C2 (sv) 1997-02-03 1998-10-12 Asea Brown Boveri Förfarande och anordning för montering av en stator -lindning bestående av en kabel.
SE9704422D0 (sv) 1997-02-03 1997-11-28 Asea Brown Boveri Ändplatta
SE9704421D0 (sv) 1997-02-03 1997-11-28 Asea Brown Boveri Seriekompensering av elektrisk växelströmsmaskin
SE9704427D0 (sv) 1997-02-03 1997-11-28 Asea Brown Boveri Infästningsanordning för elektriska roterande maskiner
GB2331867A (en) 1997-11-28 1999-06-02 Asea Brown Boveri Power cable termination
WO1999029015A2 (en) 1997-11-28 1999-06-10 Asea Brown Boveri Ab Method and device for controlling the magnetic flux with an auxiliary winding in a hv ac machine
US6801421B1 (en) 1998-09-29 2004-10-05 Abb Ab Switchable flux control for high power static electromagnetic devices
JP5079316B2 (ja) * 2006-12-08 2012-11-21 Ｎｅｃトーキン株式会社 インダクタンス素子

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE678251C (de) * 1931-08-11 1939-07-12 Siemens & Halske Akt Ges Verfahren zur Herstellung von UEbertragerkernen
DE2755218A1 (de) * 1977-12-10 1979-06-13 Philberth Karl Dr Phys Kernblech fuer mantelkerne, insbesondere fuer transformatoren
FR2576447A1 (fr) * 1985-01-24 1986-07-25 Baron Guy Dispositif de lignes de transmission de courants faibles attenuant les parasites

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE678251C (de) * 1931-08-11 1939-07-12 Siemens & Halske Akt Ges Verfahren zur Herstellung von UEbertragerkernen
DE2755218A1 (de) * 1977-12-10 1979-06-13 Philberth Karl Dr Phys Kernblech fuer mantelkerne, insbesondere fuer transformatoren
FR2576447A1 (fr) * 1985-01-24 1986-07-25 Baron Guy Dispositif de lignes de transmission de courants faibles attenuant les parasites

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0779634A1 (de) * 1995-12-14 1997-06-18 Schneider Electric Sa Stromwandler und Verfahren zu seiner Herstellung
FR2742573A1 (fr) * 1995-12-14 1997-06-20 Schneider Electric Sa Transformateur de courant et son procede de fabrication
US6335673B1 (en) 1995-12-14 2002-01-01 Schneider Electric Sa Current transformer and its manufacturing process
GB2331857A (en) * 1997-11-28 1999-06-02 Asea Brown Boveri Magnetic core assemblies

Also Published As

Publication number Publication date
YU13291A (sh) 1994-06-10
JPH04212403A (ja) 1992-08-04
EP0439410A3 (en) 1992-01-29
YU48139B (sh) 1997-05-28

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