EP3738133A1 - Noyau pour un transformateur - Google Patents

Noyau pour un transformateur

Info

Publication number
EP3738133A1
EP3738133A1 EP19710339.3A EP19710339A EP3738133A1 EP 3738133 A1 EP3738133 A1 EP 3738133A1 EP 19710339 A EP19710339 A EP 19710339A EP 3738133 A1 EP3738133 A1 EP 3738133A1
Authority
EP
European Patent Office
Prior art keywords
core
sheets
sheet
transformer
air gap
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.)
Granted
Application number
EP19710339.3A
Other languages
German (de)
English (en)
Other versions
EP3738133C0 (fr
EP3738133B1 (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 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 Siemens AG filed Critical Siemens AG
Publication of EP3738133A1 publication Critical patent/EP3738133A1/fr
Application granted granted Critical
Publication of EP3738133C0 publication Critical patent/EP3738133C0/fr
Publication of EP3738133B1 publication Critical patent/EP3738133B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
  • a transformer comprising a plurality of arcuate laminations all joined together to form a core-forming structure around a core opening, the sheet ends of each sheet within the core not mutually contacting each other so that the laminations are at their respective sheet-metal ends within the core or form at least one air gap with the core at one edge of the core.
  • the cores of the transformers are often formed as so-called hubs, which consist of many layers of thin sheets, which are offset from each other placed around each other or pushed into each other and form sheet coils with at least one section.
  • One leg of the winding cores passes through the transformers windings.
  • Several hubs can be arranged side by side or around each other.
  • Ker ne for example, the type "Unicore single”, the Wi kkelkerne be first disassembled by hand into individual so-called “books”, then book by book through the prefabricated
  • Transformer windings to be passed through by hand. Such a manufacturing process is manual and can not be carried out inexpensively.
  • the problem solved by the invention is therefore to minimize the no-load losses in the transformers by the lowest possible magnetic resistances.
  • a core for a transformer comprising a plurality of bent sheets. The sheets are all to one around a core opening
  • the core is impregnated or coated with a lacquer, which contains magnetic particles, at least at the sheet metal ends of the sheets, wherein the impregnation or the coating fills at least the air gaps at the sheet ends of the sheets.
  • the impregnation thus fills at least the area of the air gap between the sheet ends. This leads to the fact that the magnetic flux is not bulged as much at the transition from one end of the sheet through the filled with magnetic paint air gap to the next end of the sheet, as would be the case without magnetic per meable filling, so as in a filling with oil or air.
  • the magnetic resistance of a transformer reduces. In other words, the idling losses are reduced in a core according to the invention compared with de nen of cores of the prior art.
  • Particles containing paint impregnated or coated Particles containing paint impregnated or coated.
  • the impregnation or the coating can therefore also be applied to the entire core, whereby the core filling factor and thus the efficiency of the transformer verbes sert is.
  • the magnetic particles introduced by the impregnation or coating reduce the magnetic resistance of the core.
  • the magnetic particles are superparamagnetic cal iron oxide nanoparticles.
  • Such nanoparticles are so small that they form a suspension with the liquid paint and thus penetrate with the liquid paint in narrow air gaps ei Nes core.
  • the paint is a polyurethane lacquer.
  • a polyurethane lacquer is characterized by its hardness and its corrosion resistance. Also, in these paints, suspension formation with the superparamagnetic iron oxide nanoparticles is possible.
  • the paint is a water-based paint.
  • a water-based paint also eliminates potential environmental problems caused by harmful solvents.
  • the core is composed of substantially U-shaped metal sheets, which are arranged displaced into one another such that the legs of a U-shaped sheet are at least partially in contact with a leg of another U-shaped sheet, wherein the legs of these two Sheet connecting sections are positioned significantlylie ing each other.
  • the core is preferably a core of the type "Unicore duo" or a core of the type "Tranco".
  • the impregnation or coating of such core types with a paint containing magnetic particles is particularly preferred because the resulting gap between the two air of a sheet metal turn idling losses can be largely compensated.
  • the production can be better automated, in particular the core can be assembled automatically. This eliminates much manual work and it can be manufactured inexpensively larger series. The manual insertion of "books”, as with the types "Unicore single", so here deleted.
  • Sheet metal of the core in each case bent around the core opening around, wherein the sheets are each interrupted at one point by an air gap such that at this air gap, the sheet ends aligned opposite each other
  • the core is also preferably embodied as a core of the type "Unicore single." Even with a winding core of the type “Unicore sin gle", in which only one air gap per sheet coil is present, an impregnation increases the efficiency of the Trans formators. The manufacturing advantages of this type of core are retained.
  • the core is a winding core.
  • the impregnation relationship or coating with the coating containing the magnetic particles helps to significantly improve the Ef efficiency of the transformer.
  • the core is a stack core. Even with stack cores, the coating described above leads to a reduction in idling losses. In other words, the impregnation or the coating is also applicable to Sta pelkerne, which have a common common air gap over the sheets. This is mixed with the paint, the mag- contains netic particles, filled and thus increases the efficiency of the transformer.
  • a method of manufacturing a transformer which comprises a plurality of bent sheets, all of which are one to a
  • the inventive method comprises the following steps: passing the individual sheets through at least one transformer winding of
  • the paint is sprayed on the sheet ends.
  • 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 preferably takes place by spraying the paint on the sheets of the core. This is before given to a cup gun used.
  • FIG. 2 shows a winding core of the "Unicore duo" type
  • FIG. 3 shows a stacking core
  • FIG. 4 shows a winding core combination Evans core of Unicore cores
  • Figure 6 is a schematic representation of the air gap filling and insulation.
  • FIG. 1 shows an oblique view of an exfoliated, not completely assembled core of the invention "Unicore single" 7.
  • the sheets 1 form the core 3, which winds around a core opening 4 for a transformer winding Because the two sheet metal ends 2 of a sheet 1 with a clotting gene air gap 5 on each other.A filling of the air gap 5 with magnetic particles reduces the magnetic resistance in the respective sheet metal turn , wherein the sheets 1 are each interrupted at one point by an air gap 5 such that at this Air gap 5, the sheet ends 2 are arranged aligned opposite each other.
  • the sheets 1 in this embodiment are C-shaped. Again, in other words, the sheets 1 each have the shape of a broken at one point
  • FIG. 2 shows an oblique view of an untwisted Unicore duo core 3 according to the invention 8.
  • the metal sheets 1 form the halves of the core 3, which are put together around the core opening 4 for a transformer winding depending Weil the sheet ends 2 of a sheet 1 from a half with a small air gap 5 on the sheet ends 2 stronglylie gender sheets 1 from the other half (in Figure 2 marked air gap 5 areas denote those areas of the core halves in which the air gaps.
  • FIG. 3 schematically shows a stack core 9 according to the invention.
  • the core 2 consisting of two halves forms a core opening 4 for a transformer winding.
  • the core 3 has a plurality of stacked sheets 1, the sheet ends 2 meet each on the sheet ends 2 of the other part of the core 3.
  • This also forms at one composite core 3 in each case two air gaps 5, which can be filled with magnetic particles (the areas designated in fi gure 5 as air gap 5 areas those areas of the core halves in which the air gaps 5 after an assembly of the core halves erge ben).
  • Even with this type of core is described with the imoniagntechnik or coating in the magnetic Wi resistance of the transformer reduced and increases the efficiency.
  • FIG. 4 shows an oblique view of a composite hub combination, which is also referred to as "Evans core", ie as “Evans core” 10.
  • the Evans core includes several Unicore cores.
  • the two inner winding cores besit zen the core openings 4 for transformer windings.
  • the outer winding core 11 is wound around the two inner winding cores 12. All hubs in this core combination be available from one of the aforementioned core types, the degree of effect is increased by the impregnation with magnetic particles.
  • FIG 5 various combinations of cores 3 ge shows.
  • the transformer winding 13 on the core 3.
  • the transformer winding 13 winds two cores 3.
  • a three-phase transformer with four cores 3 is shown, each transformer winding 13 being 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 representation through the core 3 according to the invention shown in FIG. 1.
  • the air gap filling of this core 3 is shown in FIG.
  • the plates 1 abut with their plate ends 2 aneinan of, each forming an air gap 5.
  • These air gaps 5 are filled with the paint 6, the magnetic particle contains particles.
  • the filled air gaps 5 thus have a lower magnetic resistance and thus also reduce the no-load losses.
  • the outer side of the core 3 is impregnated with the lacquer 6 (not shown in FIG. 6) and thus protects the core 3 against the effects of weathering.
  • Such a core 3 can thus also be advantageously used, in particular in the case of dry-entraining 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)
  • Housings And Mounting Of Transformers (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

L'invention concerne un noyau (3) pour un transformateur, qui comprend une pluralité de tôles (1) cintrées, qui sont toutes reliées en une structure s'étendant en périphérie autour d'une ouverture de noyau (4) et formant le noyau (3). Les extrémités de tôle (2) de chaque tôle (1) ne sont pas en contact mutuellement à l'intérieur du noyau (3). Les tôles (1) réalisent, à leurs extrémités de tôle (2) respectives, à l'intérieur du noyau (3) ou sur un bord du noyau (3), au moins un entrefer (5) avec le noyau (3). Le noyau (3) est imprégné ou revêtu au moins aux extrémités de tôle (2) des tôles (1) d'un vernis (6) qui contient des particules magnétiques. L'imprégnation ou le revêtement remplit au moins les entrefers (5) aux extrémités de tôle (2) des tôles (1). L'invention concerne en outre un procédé de fabrication d'un transformateur comprenant un noyau (3) selon l'invention.
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 true EP3738133A1 (fr) 2020-11-18
EP3738133C0 EP3738133C0 (fr) 2023-07-12
EP3738133B1 EP3738133B1 (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 (9)

Country Link
US (1) US20210065944A1 (fr)
EP (1) EP3738133B1 (fr)
CN (1) CN111801751B (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
US10607763B2 (en) * 2015-05-19 2020-03-31 Panasonic Intellectual Property Management Co., Ltd. Reactor
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
ES2959476T3 (es) 2024-02-26
BR112020016616A8 (pt) 2023-04-25
CN111801751A (zh) 2020-10-20
PL3738133T3 (pl) 2023-12-27
EP3738133C0 (fr) 2023-07-12
DE102018203087A1 (de) 2019-09-05
WO2019166645A1 (fr) 2019-09-06
US20210065944A1 (en) 2021-03-04
BR112020016616A2 (pt) 2020-12-15
CO2020009898A2 (es) 2020-08-21
CA3092514A1 (fr) 2019-09-06
EP3738133B1 (fr) 2023-07-12
CN111801751B (zh) 2024-05-24

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