EP0151048A1 - Elektrische Induktionsgeräte - Google Patents

Elektrische Induktionsgeräte Download PDF

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Publication number
EP0151048A1
EP0151048A1 EP19850300695 EP85300695A EP0151048A1 EP 0151048 A1 EP0151048 A1 EP 0151048A1 EP 19850300695 EP19850300695 EP 19850300695 EP 85300695 A EP85300695 A EP 85300695A EP 0151048 A1 EP0151048 A1 EP 0151048A1
Authority
EP
European Patent Office
Prior art keywords
magnetic
layers
yoke
legs
yokes
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Withdrawn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
EP19850300695
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English (en)
French (fr)
Inventor
Arthur James Wakeling
Leslie Victor Ronald Smith
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.)
HAWKER SIDDELEY POWER TRANSFORMERS Ltd
Original Assignee
HAWKER SIDDELEY POWER TRANSFORMERS Ltd
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 HAWKER SIDDELEY POWER TRANSFORMERS Ltd filed Critical HAWKER SIDDELEY POWER TRANSFORMERS Ltd
Publication of EP0151048A1 publication Critical patent/EP0151048A1/de
Withdrawn legal-status Critical Current

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    • 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
    • H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
    • 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
    • H01F27/25—Magnetic cores made from strips or ribbons

Definitions

  • This invention relates to a magnetic core for induction apparatus, e.g. a power transformer or a distribution transformer, the magnetic core being of the kind comprising spaced apart yokes each formed of magnetic strip material and legs, interconnecting said yokes, each formed of layers of magnetic material which are substantially planar for at least most of their length and each being interleaved at its ends with yoke layers of said magnetic strip material.
  • the invention also relates to a method of manufacturing, and to induction apparatus provided with, a magnetic core of the kind referred to.
  • a known magnetic core of the kind referred to for a three phase power transformer comprises a plurality of interleaved silicon steel plates assembled together to provide a laminated core having spaced apart, horizontal top and bottom yokes interconnected by three vertical legs.
  • the laminations of the yokes and legs lie in substantially parallel planes.
  • Each toroidal yoke is constituted by a plurality of arcuate lengths of magnetic strip material, each approximately 2/3 of the average circumference of the yoke, which are assembled together in such a manner as to enable layers of each yoke to be interleaved with the laminations of the legs.
  • Such known magnetic cores of the kind referred to can be made with extremely low magnetic losses.
  • low loss materials such as "METGLAS” (Trade Mark) strip material manufactured by Allied Chemical Corporation, has led to the possibility of magnetic cores of even lower magnetic loss being produced.
  • Amorphous ferromagnetic materials are produced by the rapid solidification of molten metals at cooling rates of about one million degrees centigrade per second so that solidification occurs before the atoms have a chance to segregate or crystallize. To achieve this high quenching rate the finished material must be thin. In addition the material is very hard and difficult to cut. These properties render it difficult to produce conventional magnetic cores, of the kind referred to, where much cutting of strip material to produce. the necessary laminations is required. However transformer cores have been produced from this low loss material by building up the core from wound layers of strip material.
  • a transformer core has been produced by winding low loss strip material into rectangular first and second coils, arranging the first and second coils back to back and winding further low loss strip material in a third coil around the first and second coils.
  • a central vertical core leg is formed by the back to back sides of the first and second coils and outer coil legs are formed by outer parts of the first and second coils and by parts of the encircling third coil.
  • Spaced apart, horizontal upper and lower core yokes are formed by upper and lower parts, respectively, of the three wound coils.
  • transformer cores having yokes formed of wound low loss material have a number of disadvantages. Firstly it is difficult to position electrical windings around the vertical core legs since the core yokes cannot be separated from the core. It is thus necessary either to wind electrical windings directly onto the core legs or to cut through the core yokes, position pre-wound electrical windings on the core legs and finally re-join the cut core yokes. Both of these methods are unsuited to the manufacture of magnetic cores for power transformers and can only be used in practice for the manufacture of magnetic cores for small distribution transformers. Secondly, the layers of the wound yokes are generally arranged perpendicular to the axes of the electrical windings on the vertical legs. With such an arrangement leakage flux from the electrical windings generates eddy currents in the yokes resulting in high temperatures and magnetic losses in the core.
  • the present invention aims to provide a magnetic core for induction apparatus having yokes formed of magnetic strip material in which the above-identified problems are avoided.
  • a magnetic core for induction apparatus is characterised in that each yoke is formed of wound layers of the said magnetic strip material.
  • the legs may be formed from laminations of grain oriented magnetic material, e.g. silicon steel, and/or from layers of amorphous magnetic material typically formed by winding or folding one or more strips of the amorphous material backwards and forwards on itself to build up each multi-layered core leg.
  • grain oriented magnetic material e.g. silicon steel
  • amorphous magnetic material typically formed by winding or folding one or more strips of the amorphous material backwards and forwards on itself to build up each multi-layered core leg.
  • each yoke is wound from one or more strips of amorphous magnetic material.
  • the yokes may be wound into closed loops or coils of any desired shape although a closed loop of generally triangular shape with rounded corners is preferred.
  • a typical construction of magnetic core for a three phase transformer comprises three vertical legs, e.g. laminated legs, spaced at intervals of 120 degrees about a central vertical axis and two horizontal yokes each wound in coil form from magnetic strip material. At the top and bottom of each leg, the leg layers or laminations are interleaved with the layers of the yokes.
  • induction apparatus e.g. a transformer, having a magnetic core according to said one aspect of the present invention.
  • a method of manufacturing a magnetic core for induction apparatus comprising forming legs from layers of magnetic material which are substantially planar for at least most of their length and arranging magnetic strip material at opposite ends of the legs so as to form two spaced apart yokes interconnected by the legs with layers of magnetic strip material of each yoke being interleaved with said layers of magnetic material of said legs at respective ends of said legs, is characterised in that the said magnetic strip material is wound to provide the yokes with said layers of said magnetic strip material.
  • Figure 1 shows a partly constructed three phase power transformer comprising a magnetic core generally designated 1, having three upstanding legs 2-4 and a lower yoke 5, and pre-formed cylindrical electrical windings 6-8, each of generally cylindrical shape, surrounding the limbs 2-4, respectively.
  • an upper yoke 9 (see Figure 2) is in the process of being formed by winding ferromagnetic strip material 10 from a roll 11.
  • the yokes 5, 9 magnetically couple respective ends of the legs 2-4 and are generally of triangular form with rounded corners.
  • the core legs 2-4 are equally angularly spaced apart around a central axis 12 and are each formed of laminae stamped from conventional silicon steel.
  • the laminae of each core leg 2-4 are staggered, or have two different lengths, so that when the laminae are placed against each other a plurality of slots 13 is formed at each end of each leg 2-4 (see Figure 3).
  • Each core yoke 5 (9) is formed by winding ribbons, of two different widths, of amorphous ferromagnetic material, e.g. "METGLAS" strip material, into a coil with the layers of ribbons forming each yoke extending widthwise in substantially the same direction as the central axis 12.
  • amorphous ferromagnetic material e.g. "METGLAS" strip material
  • each yoke 5 (9) is provided with continuous grooves or slots 15 in an end surface facing towards the other yoke.
  • a similar construction may be formed by winding a number of rolls of ribbon of one width in one or more turns alternately with a number of rolls of ribbon of another width in one or more turns.
  • each yoke comprises yoke parts 5a wound from ribbon of one width and yoke parts 5b wound from ribbon of a larger width.
  • the yoke parts 5a are spaced from each other by the yoke parts 5b by substantially the thickness of the laminae making up the core legs 2-4. Since the core leg laminae are generally thicker than the ribbons of amorphous ferromagnetic material, it is necessary for each yoke part Sa, 5b to be formed of several turns or layers of its respective ribbon.
  • the finished core is assembled by interleaving layers of each yoke with layers of the respective leg ends.
  • the slot-defining yoke parts 5b are inserted into the slots 13 defined between the laminae of the legs 2 (3,4).
  • the magnetic core 1 described above has particularly low magnetic loss and is ideal for use in a low loss transformer.
  • the yokes 5, 9 are made of wound layers of low loss amorphous ferromagnetic material. By winding yoke layers in continuous turns a yoke can be formed in a relatively simple manner, requiring comparatively little cutting of the strip material.
  • the wound yoke layers are arranged on edge to the electrical windings 6-8 (i.e. the yoke layers extend widthwise substantially in the same direction as the central axis 12) so that the generation of eddy currents in the yoke layers caused by magnetic leakage flux is minimised, resulting in magnetic losses and the generation of heat in the yokes also being minimised.
  • each core yoke The interleaving of layers of each core yoke with respective ends of the core legs ensures that there is good magnetic coupling between the various core parts.
  • the formation of each yoke as a closed loop or coil is designed to minimise the length of flux path from one core leg to the other two core legs.
  • each leg lamination may be slightly distorted out of a planar condition at each of its ends although the laminations will be substantially planar throughout the greater part of their lengths.
  • Slots 15 do not now need to be formed in the yokes 5, 9. The thickness of the interleaved leg and yoke layers will, in this instance, be greater than portions of the core and yoke which are not interleaved.
  • the core legs 2-4 instead of being formed of laminations may be formed wholly or partially of pliant strip material, e.g. ribbons of amorphous ferromagnetic material.
  • Figure 4 illustrates one way in which a ribbon of amorphous ferromagnetic material is folded or wound backwards and forwards on itself to produce a multi-layered core leg 21.
  • an indexing spigot 22 the length of each folded, layer may be controlled to provide slots 23 at opposite ends of the core leg for coupling the latter to end yokes.
  • Figures 5 and 6 show schematically alternative methods of interleaving ferromagnetic layers of a core leg with ferromagnetic layers of a core yoke.
  • a ribbon 30 of amorphous ferromagnetic material is folded in the manner described with reference to Figure 4 to produce a multi-layered core leg 31 having slots 32 at each of its ends (only one of which is visible in Figure 5).
  • a further ribbon 33 of amorphous ferromagnetic material having a width corresponding substantially to the depth of the slots 32 is then wound into the slots 32 to form one or both multi-layered end yokes 34.
  • each core leg is formed from equal length folded layers of ribbon 40 (see Figure 6) and to subsequently separate the folded layers at each end of the core leg to provide slots 41 therein.
  • the layers of ribbon 40 are substantially planar throughout most of their length, although the end portions of the layers may be slightly out of a planar condition.-
  • each multi-layered end yoke is then formed by winding a further ribbon 42 of amorphous ferromagnetic material into the slots 41.
  • the yokes 5, 9 may be formed from other types of ferromagnetic strip material.
  • each yoke of closed loop form may be constructed by connecting together two or more yoke parts end to end to form a closed loop yoke.
  • each yoke part may comprise layers of strip material folded backwards and forwards on each other to form the desired multi-layered yoke part, the yoke layers extending widthwise in substantially the same direction as the central axis 12.
  • the layers at the ends of the connected-together yoke parts may be interleaved with each other to improve the magnetic coupling between the connected together yoke parts.
  • the yoke parts being connected end-to-end to form a yoke of closed loop form, it is possible for three yoke parts to interconnect respective ends of the three spaced apart limbs or legs.
  • each of the magnetic cores described herein makes use of flexible magnetic strip material which is wound to form spaced apart core yokes, the layers of the wound flexible magnetic strip material being interleaved with layers of strip material forming the legs of the magnetic core.
  • These layered core legs may themselves be made of flexible strip material or, alternatively, comprise conventional laminations - e.g stamped from thicker ferromagnetic sheet material.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP19850300695 1984-02-02 1985-02-01 Elektrische Induktionsgeräte Withdrawn EP0151048A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB848402737A GB8402737D0 (en) 1984-02-02 1984-02-02 Electrical induction apparatus
GB8402737 1984-02-02

Publications (1)

Publication Number Publication Date
EP0151048A1 true EP0151048A1 (de) 1985-08-07

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ID=10555950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850300695 Withdrawn EP0151048A1 (de) 1984-02-02 1985-02-01 Elektrische Induktionsgeräte

Country Status (2)

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EP (1) EP0151048A1 (de)
GB (1) GB8402737D0 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0367942A1 (de) * 1988-11-08 1990-05-16 TRANSFORMATOREN- UND ROENTGENWERK GmbH Lamellierte Magnetkerne, Magnetkernteile und Kompaktbleche sowie Verfahren zu ihrer Herstellung
WO1997045849A1 (en) * 1996-05-24 1997-12-04 Telefonaktiebolaget Lm Ericsson (Publ) A method of manufacturing magnetic cores
WO2000025327A1 (en) * 1998-10-26 2000-05-04 A.T.T. Advanced Transformer Technologies (1998) Ltd. A three-phase transformer
WO2003019588A1 (en) * 2001-08-24 2003-03-06 F.D.U.E.G. S.R.L. Multiphase electrical induction machine of the static type
US8373529B2 (en) * 2009-02-05 2013-02-12 Hexaformer Ab Amorphous metal continuous flux path transformer and method of manufacture
RU2569931C1 (ru) * 2014-08-21 2015-12-10 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" Пространственный симметричный магнитопровод

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT204634B (de) * 1956-12-18 1959-08-10 Bbc Brown Boveri & Cie Verfahren zur Herstellung eines Joches für einen magnetischen Kreis und nach diesem Verfahren hergestelltes Joch
AT219705B (de) * 1960-11-30 1962-02-12 Bbc Ag Oesterr Kern für Mehrphasen-, insbesondere Dreiphasentransformatoren
DE1247468B (de) * 1964-12-05 1967-08-17 Siemens Ag Drei- oder mehrschenkliger, aus kornorientierten Blechen geschichteter Kern fuer Transformatoren, Drosselspulen od. dgl. elektrische Induktionsgeraete
DE1489628A1 (de) * 1965-04-02 1970-07-23 Bbc Brown Boveri & Cie Eisenkern fuer induktive Einrichtungen
DE2160197A1 (de) * 1971-12-04 1973-06-07 Ad Heitmeier Drehstrom-transformator oder dergl. in tempelbauweise
US4085603A (en) * 1974-05-21 1978-04-25 Jaroslav Vanek Method of making V-shaped magnetic circuit elements
US4364020A (en) * 1981-02-06 1982-12-14 Westinghouse Electric Corp. Amorphous metal core laminations

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT204634B (de) * 1956-12-18 1959-08-10 Bbc Brown Boveri & Cie Verfahren zur Herstellung eines Joches für einen magnetischen Kreis und nach diesem Verfahren hergestelltes Joch
AT219705B (de) * 1960-11-30 1962-02-12 Bbc Ag Oesterr Kern für Mehrphasen-, insbesondere Dreiphasentransformatoren
DE1247468B (de) * 1964-12-05 1967-08-17 Siemens Ag Drei- oder mehrschenkliger, aus kornorientierten Blechen geschichteter Kern fuer Transformatoren, Drosselspulen od. dgl. elektrische Induktionsgeraete
DE1489628A1 (de) * 1965-04-02 1970-07-23 Bbc Brown Boveri & Cie Eisenkern fuer induktive Einrichtungen
DE2160197A1 (de) * 1971-12-04 1973-06-07 Ad Heitmeier Drehstrom-transformator oder dergl. in tempelbauweise
US4085603A (en) * 1974-05-21 1978-04-25 Jaroslav Vanek Method of making V-shaped magnetic circuit elements
US4364020A (en) * 1981-02-06 1982-12-14 Westinghouse Electric Corp. Amorphous metal core laminations

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0367942A1 (de) * 1988-11-08 1990-05-16 TRANSFORMATOREN- UND ROENTGENWERK GmbH Lamellierte Magnetkerne, Magnetkernteile und Kompaktbleche sowie Verfahren zu ihrer Herstellung
WO1997045849A1 (en) * 1996-05-24 1997-12-04 Telefonaktiebolaget Lm Ericsson (Publ) A method of manufacturing magnetic cores
WO2000025327A1 (en) * 1998-10-26 2000-05-04 A.T.T. Advanced Transformer Technologies (1998) Ltd. A three-phase transformer
US6792666B1 (en) * 1998-10-26 2004-09-21 A.T.T Advanced Transformer Technologies (1998) Ltd. Three-phase transformer
US6880228B2 (en) 1998-10-26 2005-04-19 A.T.T. Advanced Transformer Technologies, Ltd. Method for manufacturing a three-phase transformer
WO2003019588A1 (en) * 2001-08-24 2003-03-06 F.D.U.E.G. S.R.L. Multiphase electrical induction machine of the static type
US8373529B2 (en) * 2009-02-05 2013-02-12 Hexaformer Ab Amorphous metal continuous flux path transformer and method of manufacture
RU2569931C1 (ru) * 2014-08-21 2015-12-10 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" Пространственный симметричный магнитопровод

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Publication number Publication date
GB8402737D0 (en) 1984-03-07

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Inventor name: WAKELING, ARTHUR JAMES

Inventor name: SMITH, LESLIE VICTOR RONALD