EP3738133B1 - Noyau pour un transformateur - Google Patents

Noyau pour un transformateur Download PDF

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Publication number
EP3738133B1
EP3738133B1 EP19710339.3A EP19710339A EP3738133B1 EP 3738133 B1 EP3738133 B1 EP 3738133B1 EP 19710339 A EP19710339 A EP 19710339A EP 3738133 B1 EP3738133 B1 EP 3738133B1
Authority
EP
European Patent Office
Prior art keywords
core
metal
lacquer
transformer
metal sheets
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
EP19710339.3A
Other languages
German (de)
English (en)
Other versions
EP3738133C0 (fr
EP3738133A1 (fr
Inventor
Stephan Voss
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.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens Energy Global GmbH and Co KG
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 Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Publication of EP3738133A1 publication Critical patent/EP3738133A1/fr
Application granted granted Critical
Publication of EP3738133B1 publication Critical patent/EP3738133B1/fr
Publication of EP3738133C0 publication Critical patent/EP3738133C0/fr
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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • 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
    • H01F27/2455—Magnetic cores made from sheets, e.g. grain-oriented using bent laminations
    • 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
    • H01F27/255—Magnetic cores made from particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/02—Cores, Yokes, or armatures made from sheets
    • 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
    • H01F41/024—Manufacturing of magnetic circuits made from deformed sheets

Definitions

  • the present invention relates to a core for a transformer, which comprises a large number of bent laminations, all of which are connected to form a structure which runs around a core opening and forms the core, with the lamina ends of each lamina not touching one another within the core, so that the Sheets form at least one air gap with the core at their respective sheet ends within the core or at an edge of the core, the core being impregnated or coated at least at the sheet ends of the sheets with a lacquer which contains magnetic particles, and the impregnation or the Coating at least fills the air gaps at the sheet metal ends of the sheets.
  • Such a core is from the EP 2 529 380 B1 already known.
  • the core shown there has a core stack consisting of several layers, the layers consisting of flat sheets or strips.
  • the layers of one core stack face the end faces of the layers of another core stack with their end faces forming the gaps.
  • a free-flowing filling material containing magnetic particles penetrates into these interstices.
  • the filling material is hardened by heating.
  • the GB 1 173 447 A discloses a winding core composed of C-shaped structures.
  • the cores of the transformers are often designed as so-called winding cores, which consist of many layers of thin metal sheets that are offset against each other are placed around one another or pushed into one another and form sheet metal windings with at least one cut.
  • winding cores leads through the transformer windings.
  • Several winding cores can be arranged side by side or around one another.
  • the winding cores are first dismantled by hand into individual so-called “books” in order to then be laid by hand book by book through the prefabricated transformer windings. Such a manufacturing process runs manually and therefore cannot be carried out cost-effectively.
  • the complete core can be separated into two mostly U-shaped or V-shaped halves, each half can be performed from opposite directions through the prefabricated transformer windings, and then to a complete core to be assembled.
  • Such a core can be assembled automatically through the transformer windings.
  • winding cores of the "Unicore single" type have only one cut per sheet winding
  • a winding core of the "Unicore duo" type or a stacked core has two cuts per sheet winding. This leads to higher no-load losses with these types. These reduce the efficiency of the transformer.
  • the no-load losses are an important criterion for the selection of a transformer type, especially in energy distribution networks.
  • the problem solved by the invention is therefore to reduce the no-load losses in the transformers as much as possible to minimize low magnetic resistances and at the same time to protect the core against weather influences.
  • a core for a transformer includes a plurality of bent laminations.
  • the laminations are all connected to form a structure that runs around a core opening and forms the core, with the lamina ends of each lamina not touching each other within the core, so that the laminations have at least one at their respective lamina ends within the core or at an edge of the core Form an air gap with the core.
  • the core is impregnated or coated at least at the sheet metal ends of the sheets with a lacquer containing magnetic particles, with the impregnation or the coating filling at least the air gaps at the sheet metal ends of the sheets.
  • the impregnation thus fills out at least the area of the air gaps between the sheet metal ends. This means that the magnetic flux does not bulge as much during the transition from one end of the sheet through the air gap filled with magnetic paint to the next end of the sheet as it would be without a magnetically permeable filling, i.e. if it was filled with oil or air.
  • the magnetic resistance of a transformer is reduced. In other words, the no-load losses for a core according to the invention are reduced compared to those of prior art cores.
  • the entire core is impregnated or coated with the paint containing the magnetic particles.
  • the impregnation or coating is therefore applied to the entire core, which improves the core fill factor and thus the efficiency of the transformer.
  • the through the impregnation or Coating introduced magnetic particles reduce the magnetic resistance of the core.
  • the magnetic particles are superparamagnetic iron oxide nanoparticles.
  • Such nanoparticles are so small that they form a suspension with the liquid paint and thus penetrate the narrow air gaps of a core with the liquid paint.
  • the paint is a polyurethane paint.
  • a polyurethane paint is characterized by its hardness and its resistance to corrosion. Suspension formation with the superparamagnetic iron oxide nanoparticles is also possible with these paints.
  • the paint is a water-based paint.
  • Using a water-based paint also eliminates potential environmental problems from harmful solvents.
  • the core is preferably composed of essentially U-shaped metal sheets which are arranged one inside the other in such a way that the legs of one U-shaped metal sheet are at least partially in contact with one leg of another U-shaped metal sheet, the legs of these two Plates connecting portions are positioned opposite each other.
  • the core is preferably a core of the "Unicore duo" type or a core of the "Tranco” type.
  • the impregnation or coating of such types of cores with a paint containing magnetic particles is particularly preferred, since the no-load losses occurring through the two air gaps of a sheet metal winding can be largely compensated for here.
  • production can be better automated, in particular the core can be assembled in an automated manner. This eliminates a lot of manual work and larger series can be manufactured inexpensively. The manual insertion of "books", as with the "Unicore single” types, is not necessary here.
  • the laminations of the core are each bent around the core opening, with the laminations each being interrupted at one point by an air gap in such a way that the lamina ends are arranged opposite one another at this air gap.
  • the core is also preferably designed as a core of the “Unicore single” type. Impregnation also increases the efficiency of the transformer with a winding core of the "Unicore single” type, in which there is only one air gap per turn of sheet metal. The manufacturing advantages of this core type are retained.
  • the core is preferably a winding core.
  • the impregnation or coating with the paint containing the magnetic particles helps to significantly improve the efficiency of the transformer.
  • the core is preferably a stacked core.
  • the coating described above also leads to a reduction in no-load losses with stacked cores.
  • the impregnation or the coating can also be used on stacked cores that have a common air gap across the sheets. This is filled with paint containing magnetic particles, thereby increasing the efficiency of the transformer.
  • a transformer with a core according to the invention is advantageously made available.
  • a method for producing a transformer which comprises a large number of bent metal sheets, all of which can be connected to form a structure that runs around a core opening and forms the core, with the sheet metal ends of each sheet metal inside the connected core being mutually connected do not touch. Consequently, the laminations form at least one air gap with the bonded core at their respective lamina ends within the bonded core or at an edge of the bonded core.
  • the method according to the invention comprises the following steps: passing the individual metal sheets through at least one transformer winding of the transformer.
  • the lacquer is preferably sprayed onto the ends of the sheet metal.
  • the impregnation or coating of the core can be carried out particularly easily, quickly and inexpensively.
  • the impregnation or coating of the core according to the invention is preferably carried out by spraying the lacquer onto the sheets of the core.
  • a cup gun is preferably used for this purpose.
  • figure 1 shows an oblique view of a core 3 of the “Unicore single” type 7 which has been opened up and not fully assembled according to the invention.
  • the laminations 1 form the core 3 which winds around a core opening 4 for a transformer winding.
  • the two sheet metal ends 2 of a sheet metal 1 meet with a small air gap 5 .
  • Filling the air gap 5 with magnetic particles reduces the magnetic resistance in the respective sheet metal winding.
  • the laminations 1 of the core 3 are each bent around the core opening 4, with the laminations 1 each being interrupted at one point by an air gap 5 in such a way that the laminations 2 are aligned opposite one another at this air gap 5.
  • the metal sheets 1 are C-shaped in this exemplary embodiment. Described again in other words, the metal sheets 1 each have the shape of a loop that is interrupted at one point.
  • figure 2 shows an oblique view of an exploded core 3 of the "Unicore duo" type 8 according to the invention.
  • the sheets 1 form the halves of the core 3, which are plugged together around the core opening 4 for a transformer winding. Butt in the assembled state of the core 3 in each case the sheet metal ends 2 of a sheet metal 1 from one half with a small air gap 5 onto the sheet metal ends 2 of opposite metal sheets 1 from the other half (the in figure 2 Areas marked as air gap 5 designate those areas of the core halves in which the air gaps 5 result after the core halves have been joined together).
  • this type of core in the assembled state, there are two air gaps 5 in each sheet metal turn.
  • the core 3 is composed of essentially U-shaped metal sheets 1, which, when the core is fully assembled, are arranged one inside the other in such a way that the legs of a U-shaped metal sheet 1 are each connected to a leg of another U -shaped sheet 1 are at least partially in contact, the portions connecting the legs of these two sheets 1 being positioned opposite one another.
  • FIG 3 a stack core 9 according to the invention is shown schematically.
  • the core 3 consisting of two halves forms a core opening 4 for a transformer winding.
  • the core 3 has a multiplicity of sheets 1 stacked on top of one another, the sheet metal ends 2 of which each meet the sheet metal ends 2 of the other part of the core 3 .
  • two air gaps 5 are formed, which can be filled with magnetic particles (the figure 5 Areas marked as air gap 5 designate those areas of the core halves in which the air gaps 5 result after the core halves have been joined together).
  • the impregnation or coating described reduces the magnetic resistance of the transformer and increases the efficiency.
  • FIG 4 shows an oblique view of an assembled winding core combination, which is also called “Evans core”, ie referred to as the “Evans core” 10 .
  • the Evans core includes multiple Unicore cores.
  • the two inner winding cores have the core openings 4 for transformer windings.
  • the outer winding core 11 is wound around the two inner winding cores 12 . All winding cores in this core combination consist of one of the core types mentioned above, whose efficiency is increased by impregnation with magnetic particles.
  • FIG 5 different combinations of cores 3 are shown.
  • the transformer winding 13 on the core 3.
  • the transformer winding 13 wraps around two cores 3.
  • the third illustration shows a three-phase transformer with four cores 3, with each transformer winding 13 having two cores 3 wraps around.
  • the cores 3 can be impregnated in accordance with the embodiment described here, thus expanding the field of application of the respective transformer.
  • FIG 6 shows a schematic cross-sectional view through the in figure 1 core 3 according to the invention shown.
  • the air gap filling of this core 3 is shown.
  • the metal sheets 1 abut one another with their metal sheet ends 2, with an air gap 5 forming in each case.
  • These air gaps 5 are filled with paint 6 containing magnetic particles.
  • the filled air gaps 5 thus have a lower magnetic resistance and the no-load losses are also reduced as a result.
  • the outer side of the core 3 is impregnated with the varnish 6 (not shown in figure 6 ) and thus protects the core 3 against the weather.
  • Such a core 3 can therefore also be used advantageously, in particular, in dry-type transformer products.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Housings And Mounting Of Transformers (AREA)

Claims (11)

  1. Noyau (3) d'un transformateur, qui comprend une pluralité de tôles (1) coudées, qui sont reliées toutes ensemble en une structure entourant une ouverture (4) de noyau et formant le noyau (3), dans lequel les extrémités (2) de chaque tôle (1) ne se touchent pas mutuellement à l'intérieur du noyau (3), de sorte que les tôles (1) forment, à leurs extrémités (2) respectives, à l'intérieur du noyau (3) ou sur un bord du noyau (3), au moins un entrefer (5) avec le noyau (3), dans lequel le noyau (3) est imprégné ou revêtu au moins aux extrémités (2) des tôles (1) d'un vernis (6), qui contient des particules magnétiques, et dans lequel l'imprégnation ou le revêtement remplit au moins les entrefers (5) aux extrémités (2) des tôles (1), caractérisé en ce que tout le noyau (3) est imprégné ou revêtu du vernis (6) contenant les particules magnétiques.
  2. Noyau (3) suivant l'une des revendications précédentes, caractérisé en ce que les particules magnétiques sont des nanoparticules d'oxyde de fer supraparamagnétiques.
  3. Noyau (3) suivant l'une des revendications précédentes, caractérisé en ce que le vernis (6) est un vernis de polyuréthane.
  4. Noyau (3) suivant l'une des revendications précédentes, caractérisé en ce que le vernis (6) est un vernis à base d'eau.
  5. Noyau (3) suivant l'une des revendications précédentes, caractérisé en ce que le noyau (3) est composé de tôles (1) sensiblement en forme de U, qui sont disposées en se décalant l'une dans l'autre, de manière à ce que les branches d'une tôle (1) en forme de U soient respectivement en contact au moins en partie avec une branche d'une autre tôle (1) en forme de U, dans lequel les parties reliant les branches de ces deux tôles (1) sont mises en position de manière opposée l'une à l'autre.
  6. Noyau (3) suivant l'une des revendications 1 à 4, caractérisé en ce que les tôles (1) du noyau (3) sont coudées en s'étendant respectivement autour de l'ouverture (4) du noyau, dans lequel les tôles (1) sont interrompues respectivement à un endroit par un entrefer (5), de manière à ce que sur cet entrefer (5), les extrémités (2) des tôles soient disposées en étant dirigées de manière opposée l'une à l'autre.
  7. Noyau (3) suivant l'une des revendications précédentes, caractérisé en ce que le noyau (3) en rouleau est enroulé.
  8. Noyau (3) suivant l'une des revendications 1 à 4, caractérisé en ce que le noyau (3) est un noyau (9) empilé.
  9. Transformateur ayant un noyau (3) suivant l'une des revendications 1 à 8.
  10. Procédé de fabrication d'un transformateur, qui comprend une pluralité de tôles (1), qui peuvent toutes ensemble être reliées en une structure entourant une ouverture (4) de noyau et formant le noyau (3), dans lequel les extrémités (2) de chaque tôle (1) ne se touchent pas mutuellement à l'intérieur du noyau (3) relié, de sorte que les tôles (1) forment à leurs extrémités (2) respectives, à l'intérieur du noyau (3) relié ou sur un bord du noyau (3) relié, au moins un entrefer (5) avec le noyau (3) relié, dans lequel le procédé comprend les stades suivants :
    - passage des tôles (1) individuelles dans au moins un enroulement (13) du transformateur,
    - liaison des tôles (1) individuelles pour la mise à disposition du noyau (3) relié à l'intérieur du transformateur, et
    - imprégnation ou revêtement des extrémités (2) des tôles (1) par un vernis (6), qui contient des particules magnétiques, jusqu'à ce que les entrefers (5) aux extrémités (2) des tôles (1) soient remplis du vernis (6),
    - imprégnation ou revêtement de tout le noyau (3) du vernis (6) contenant les particules magnétiques.
  11. Procédé suivant la revendication 10, caractérisé en ce que l'on pulvérise le vernis (6) sur les extrémités (2) des tôles.
EP19710339.3A 2018-03-01 2019-03-01 Noyau pour un transformateur Active EP3738133B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018203087.1A DE102018203087A1 (de) 2018-03-01 2018-03-01 Kern für einen Transformator
PCT/EP2019/055188 WO2019166645A1 (fr) 2018-03-01 2019-03-01 Noyau pour un transformateur

Publications (3)

Publication Number Publication Date
EP3738133A1 EP3738133A1 (fr) 2020-11-18
EP3738133B1 true EP3738133B1 (fr) 2023-07-12
EP3738133C0 EP3738133C0 (fr) 2023-07-12

Family

ID=65729314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19710339.3A Active EP3738133B1 (fr) 2018-03-01 2019-03-01 Noyau pour un transformateur

Country Status (10)

Country Link
US (1) US20210065944A1 (fr)
EP (1) EP3738133B1 (fr)
CN (1) CN111801751B (fr)
BR (1) BR112020016616A8 (fr)
CA (1) CA3092514A1 (fr)
CO (1) CO2020009898A2 (fr)
DE (1) DE102018203087A1 (fr)
ES (1) ES2959476T3 (fr)
PL (1) PL3738133T3 (fr)
WO (1) WO2019166645A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020211253A1 (de) 2020-09-08 2022-03-10 Siemens Energy Global GmbH & Co. KG Transformator

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2937351A (en) * 1956-02-13 1960-05-17 Palmer H Craig Magnetic amplifier
GB965741A (en) * 1962-03-02 1964-08-06 Core Mfg Company Transformer core
GB1173447A (en) * 1966-07-27 1969-12-10 Telcon Magnetic Cores Ltd Improvements in Magnetic Cores
JPS60245206A (ja) * 1984-05-21 1985-12-05 Matsushita Electric Works Ltd 磁心
JP2897384B2 (ja) * 1990-09-25 1999-05-31 松下電器産業株式会社 電磁機器および電磁機器の製造方法
JP3312589B2 (ja) * 1997-12-26 2002-08-12 日本鋼管株式会社 接着強度、耐食性及び耐ブロッキング性に優れた接着鉄芯用電磁鋼板の製造方法
CN101447312A (zh) * 2008-05-30 2009-06-03 北京中机联供非晶科技股份有限公司 环氧树脂涂层降噪的离缝对接式非晶铁心
DE102009048659B3 (de) * 2009-09-29 2011-04-28 Siemens Aktiengesellschaft Transformatorkern
WO2011091846A1 (fr) * 2010-01-27 2011-08-04 Areva T&D Uk Limited Noyau magnétique
JP2012104725A (ja) * 2010-11-12 2012-05-31 Panasonic Corp 圧粉磁心およびそれを使用したコイル部品
US9601257B2 (en) * 2011-11-14 2017-03-21 Abb Schweiz Ag Wind-on core manufacturing method for split core configurations
JP2014072245A (ja) * 2012-09-27 2014-04-21 Sumitomo Electric Ind Ltd 圧粉磁心、電磁部品、及び圧粉磁心の製造方法
JP6596676B2 (ja) * 2015-05-19 2019-10-30 パナソニックＩｐマネジメント株式会社 リアクトル
DE102017204522A1 (de) * 2017-03-17 2018-09-20 Voestalpine Stahl Gmbh Verfahren zur Herstellung von lackbeschichteten Elektroblechbändern und lackbeschichtetes Elektroblechband

Also Published As

Publication number Publication date
CN111801751A (zh) 2020-10-20
CA3092514A1 (fr) 2019-09-06
CO2020009898A2 (es) 2020-08-21
BR112020016616A8 (pt) 2023-04-25
DE102018203087A1 (de) 2019-09-05
BR112020016616A2 (pt) 2020-12-15
WO2019166645A1 (fr) 2019-09-06
EP3738133C0 (fr) 2023-07-12
CN111801751B (zh) 2024-05-24
EP3738133A1 (fr) 2020-11-18
ES2959476T3 (es) 2024-02-26
PL3738133T3 (pl) 2023-12-27
US20210065944A1 (en) 2021-03-04

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