EP2395521B1 - Method for manufacture of triangular transformer cores made of amorphous metal - Google Patents

Method for manufacture of triangular transformer cores made of amorphous metal Download PDF

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Publication number
EP2395521B1
EP2395521B1 EP10005874A EP10005874A EP2395521B1 EP 2395521 B1 EP2395521 B1 EP 2395521B1 EP 10005874 A EP10005874 A EP 10005874A EP 10005874 A EP10005874 A EP 10005874A EP 2395521 B1 EP2395521 B1 EP 2395521B1
Authority
EP
European Patent Office
Prior art keywords
core
laser
band
transformer
manufacture
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.)
Active
Application number
EP10005874A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2395521A1 (en
Inventor
Martin Dr. Carlen
Lise Dr. Donzel
Stephane Dr. Schaal
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.)
ABB Technology AG
Original Assignee
ABB Technology AG
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 ABB Technology AG filed Critical ABB Technology AG
Priority to ES10005874T priority Critical patent/ES2406808T3/es
Priority to EP10005874A priority patent/EP2395521B1/en
Priority to PL10005874T priority patent/PL2395521T3/pl
Priority to KR1020110054658A priority patent/KR101867947B1/ko
Priority to CN201110162140.5A priority patent/CN102364642B/zh
Priority to BRPI1103036-4A priority patent/BRPI1103036A2/pt
Publication of EP2395521A1 publication Critical patent/EP2395521A1/en
Application granted granted Critical
Publication of EP2395521B1 publication Critical patent/EP2395521B1/en
Active legal-status Critical Current
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
    • 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
    • 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)
    • H01F41/0226—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) from amorphous ribbons
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers

Definitions

  • the invention relates to a method for manufacture of cores for three phase power transformers whereas the core is composed of three frames designed to be combined so that each transformer core leg is composed of two frame legs, and the transformer core legs are arranged in a triangular configuration.
  • a transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors - the transformer's coils.
  • three phase transformers have been developed long time ago.
  • Three phase transformers have a core comprising three or five limbs arranged in line and in parallel and both ends of each limb are connected to common yokes, In case of a five leg core the three inner limbs are provided with windings of the coils while the outer limbs only serve as conductor for the magnetic flux as well as the inner limbs, too. In case of three leg cores, all three legs are provided with windings.
  • Regularly transformers are formed by means of sheet metal which sheets are stacked or wound to form the transformer core.
  • a special transformer arrangement is the one where the transformer legs and coils are arranged at the corners of a triangle. Those limbs have been connected to yokes having the form of triangles. This arrangement allows to save space, provides a symmetrical set-up for the magnetic flux and offers benefits with respect to transformer core losses.
  • Those triangular transformers have become known as Hexaformer or as Delta transformer.
  • the core is assembled from three sub-cores each being formed as a quasi-rectangular frame whereas each of the three sub-cores is made from continuously wound steel laminations. The adjustment of the lamination width to obtain the required cross-section is done by slitting, which is a mechanical process.
  • the prior art document WO 01/82316 discloses a transformer core made of magnetic strips for use in a power distribution transformer.
  • the transformer core has a desired height and a substantially cylindrical toroidal shape produced by winding a multi-layer structure about a central axis of the toroid in a spiral like manner. Also a triangular transformer core variant is disclosed within this document.
  • the method according to the invention is characterized by the fact that the width of the steel tape is adjusted to obtain the desired circular or polygonal shape of the cross-section to the by means of laser cutting.
  • the method according to the invention is characterized by the fact that the tape provided for forming the transformer's core is an amorphous metal tape, in particular an amorphous steel tape. Cores made from amorphous steel have lower losses. However due to the amorphous structure slitting and/or cutting of amorphous metal is difficult and requires some knowhow.
  • the basic idea according to the invention is to provide the core members made from amorphous metal which is usually available as foils having a thickness of about 25 micron provided as an endless ribbon. Those foils are utilized for manufacturing of said frames by coiling the ribbon continuously. Thereby it is provided pursuant to the invention to trim the ribbon to the desired shape of the frame cross-section by means of laser cutting.
  • the winding of the ribbon and its trimming is effected preferably simultaneously thus the desired shape of the frame member is achieved exactly by form cutting the ribbon. Consequently the cutting tool is positioned close to the winding mechanism in order to define the width of the ribbon according to the respective layer with regard to the cross-section of the core leg.
  • the winding of the ribbon layers to form a frame is effected by a winding mechanism which preferably is operating partly automatically or fully automatically.
  • a further essential feature of the method according to the invention is characterized in that the sheet metal layers are made from amorphous metal.
  • the sheet metal layers are made from steel alloyed with silicium which steel is relatively brittle, too, but less brittle than the amorphous metal.
  • transformer cores made of amorphous metal have still lower losses than cores made of Si-steel respectively than other low-loss iron alloys with respect to the magnetic flux.
  • amorphous metal is rather essential for increasing the transformer's efficiency.
  • amorphous metal ribbons In case of amorphous metal ribbons, the cutting of the ribbons is difficult due to the amorphous structure of the material. Mechanical cutting is rather inefficient respectively imprecise compared to laser cutting so that according to the present invention a preferred embodiment is the use of laser beams for cutting the amorphous ribbon to an appropriate width.
  • the width to cut is easily and precisely adjustable.
  • the process allows high speed.
  • Single ribbon layers or a bundle of layers can be cut at a time.
  • the laser cutting device close to the winding mechanism so that the respective cut is done to achieve the width of the metal tape according to the respective layer with regard to the desired shape of the cross-section of the limb member which may be semicircular or polygonal.
  • the laser used for trimming the brims of the amorphous ribbons is a CO 2 laser or it is a solid state laser whereas the power of the laser is at least 2 W, but it may be higher in case of tapes having greater thickness e.g. tapes made of Si-steel.
  • the laser power can be chosen so that the layers weld together at the cut. This has the benefit that it fixes the layers together and they become easier to handle when winding the sub-cores. Hence it is a further advantage of the claimed method according to the invention to trim the ribbons according to its respective layer in order to get the desired shape of the cross-section of the frame member.
  • the laser cutting method pursuant to the invention can not only be applied for the manufacturing of Delta cores, but also for Hexaformer cores.
  • Hexaformer cores metal bands of two different widths are used for winding core loops, which provide a hexagonal core leg cross section, when they are adequately positioned.
  • the second width is half of the first width, and can therefore easily be produced by slitting a band in the middle.
  • laser cutting is also a preferred method for doing the cutting.
  • a lateral view of a transformer 10 is shown which is provided with coils 12 wound on a transformer core 14 according to the invention.
  • the transformer 10 is formed by three identical frames 16 which frames 16 form core members.
  • the three frames 16 are put together in order to form a triangular column 14 which is the transformer core according to the invention.
  • Each core member 16 has two long sides and two small sides whereas the two long sides are straight and form limb members 18 where each is put in parallel to the respective limb member 18 of an adjacent frame 16 and thus form a core leg 20.
  • each limb member 18 is either semicircular or polygonal in order to complete the cross-section of the core leg 20 to full circle or polygon.
  • the coils 12 are wound on the core legs 20 after the triangular transformer core 14 has been finished.
  • Fig. 2 shows a top view on the base section 15 of the transformer core 14 according to the invention which discloses the triangular layout of the transformer core 14. Besides that this design of the transformer 10 is space saving due to the little base the transformer core 14 requires.
  • the cross-section of each limb member 18 is semicircular and forms together with the limb member 18 of the adjacent core member 16 a core leg having a circular cross-section.
  • Fig. 3 is a schematic top view on a ribbon or tape 22 which is provided for being wound layer by layer of the transformer core 14.
  • the tape In order to achieve the desired shape of the cross-section of the limb members 18 the tape needs to be trimmed accordingly since otherwise the shape cannot be achieved by a lamination configuration where the ribbon or tape 22 is laminated in a plurality of layers.
  • the trimming of the width of a ribbon 22 is necessary to achieve the shape of the limb member 18 of a frame 16 for a transformer core 14 according to the invention.
  • the trimming is done by means of a laser 24 having a laser beam 26 whereas preferably a CO 2 laser is being used for cutting or trimming the ribbon or tape 22 and having a power of at least 10 W.
  • the laser beam 26 is guided on the ribbon or tape 22 along the desired cut line 28 which corresponds to the width of the ribbon or tape 22 required for the respective layer of core loop 14 where the ribbon or tape 22 is forwarded for winding the frame 16 as a core member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP10005874A 2010-06-08 2010-06-08 Method for manufacture of triangular transformer cores made of amorphous metal Active EP2395521B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
ES10005874T ES2406808T3 (es) 2010-06-08 2010-06-08 Método para la fabricación de núcleos de transformador triangular fabricados de metal amorfo
EP10005874A EP2395521B1 (en) 2010-06-08 2010-06-08 Method for manufacture of triangular transformer cores made of amorphous metal
PL10005874T PL2395521T3 (pl) 2010-06-08 2010-06-08 Sposób wytwarzania trójkątnych rdzeni transformatora wykonanych z metalu amorficznego
KR1020110054658A KR101867947B1 (ko) 2010-06-08 2011-06-07 비결정질 금속으로 만들어진 삼각형 변압기 코어의 제조 방법
CN201110162140.5A CN102364642B (zh) 2010-06-08 2011-06-07 用于制造由非晶态金属制成的三角形变压器芯体的方法
BRPI1103036-4A BRPI1103036A2 (pt) 2010-06-08 2011-06-07 método para fabricação de núcleos triangulares de transformador feitos de metal amorfo

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10005874A EP2395521B1 (en) 2010-06-08 2010-06-08 Method for manufacture of triangular transformer cores made of amorphous metal

Publications (2)

Publication Number Publication Date
EP2395521A1 EP2395521A1 (en) 2011-12-14
EP2395521B1 true EP2395521B1 (en) 2013-03-27

Family

ID=42941873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10005874A Active EP2395521B1 (en) 2010-06-08 2010-06-08 Method for manufacture of triangular transformer cores made of amorphous metal

Country Status (6)

Country Link
EP (1) EP2395521B1 (zh)
KR (1) KR101867947B1 (zh)
CN (1) CN102364642B (zh)
BR (1) BRPI1103036A2 (zh)
ES (1) ES2406808T3 (zh)
PL (1) PL2395521T3 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2777051C1 (ru) * 2021-02-10 2022-08-01 Першина Светлана Сергеевна Магнитный сердечник трехфазного магнитоиндукционного устройства и рамка магнитного сердечника

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL217576A0 (en) * 2012-01-17 2012-03-29 Eliezer Adar Three phase transformer and method for manufacturing same
ES2841987T3 (es) * 2012-01-18 2021-07-12 Abb Power Grids Switzerland Ag Núcleo de transformador
EP2618347B1 (en) * 2012-01-18 2020-11-18 ABB Power Grids Switzerland AG Transformer-core
EP2704164B1 (en) * 2012-08-29 2015-04-22 ABB Technology Ltd Compact triangular core transformer
US11158449B2 (en) 2015-03-12 2021-10-26 Guglielmo MONTAGNANI Method and device for manufacturing transformers with a core made of amorphous material, and transformer thus produced
FR3112648B1 (fr) * 2020-07-20 2023-04-14 Safran Electrical & Power Procédé de fabrication de boucles pour circuit magnétique
CN113436852B (zh) * 2021-05-21 2023-01-24 深圳大学 一种立体卷变压器铁心及变压器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5537089A (en) * 1993-05-27 1996-07-16 Parker-Hannifin Corporation Three phase transformer with reduced harmonic currents
CN1110827C (zh) * 1999-08-08 2003-06-04 吴茂安 圆截面立体三相变压器铁芯
DE60141897D1 (de) * 2000-03-02 2010-06-02 Lennart Hoeglund Transformatorkern
ATE334473T1 (de) * 2000-04-27 2006-08-15 A T T Advanced Transformer Tec Gewickelter transformatorkern, verfahren und vorrichtung zur dessen herstellung
CN2465291Y (zh) * 2001-01-09 2001-12-12 何方城 组合式卷铁芯三相变压器
US6737951B1 (en) * 2002-11-01 2004-05-18 Metglas, Inc. Bulk amorphous metal inductive device
CN1797619A (zh) * 2004-12-28 2006-07-05 张明德 一种开口式卷绕铁芯及其制造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2777051C1 (ru) * 2021-02-10 2022-08-01 Першина Светлана Сергеевна Магнитный сердечник трехфазного магнитоиндукционного устройства и рамка магнитного сердечника

Also Published As

Publication number Publication date
EP2395521A1 (en) 2011-12-14
KR101867947B1 (ko) 2018-07-19
CN102364642B (zh) 2015-11-25
ES2406808T3 (es) 2013-06-10
CN102364642A (zh) 2012-02-29
BRPI1103036A2 (pt) 2012-11-06
KR20110134316A (ko) 2011-12-14
PL2395521T3 (pl) 2013-08-30

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