EP2260494B1 - Transformatorkern - Google Patents

Transformatorkern Download PDF

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Publication number
EP2260494B1
EP2260494B1 EP08735299A EP08735299A EP2260494B1 EP 2260494 B1 EP2260494 B1 EP 2260494B1 EP 08735299 A EP08735299 A EP 08735299A EP 08735299 A EP08735299 A EP 08735299A EP 2260494 B1 EP2260494 B1 EP 2260494B1
Authority
EP
European Patent Office
Prior art keywords
core
sheet
angle
edge
straight
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
EP08735299A
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German (de)
English (en)
French (fr)
Other versions
EP2260494A1 (de
Inventor
Martin Alsina Navarro
Fritz Sorg
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 AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP2260494A1 publication Critical patent/EP2260494A1/de
Application granted granted Critical
Publication of EP2260494B1 publication Critical patent/EP2260494B1/de
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    • 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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor

Definitions

  • the invention relates to a transformer core, wherein the transformer core of core sheets is assembled in layers and at least one core sheet is formed from at least two sheet metal segments.
  • An end region of the first sheet metal segment has a straight cutting edge, wherein the straight cutting edge of the first sheet metal segment with a corresponding straight cutting edge of an end portion of the second sheet segment form-fitting forms a straight abutment edge and the straight abutment edge forms an angle relative to the longitudinal direction of the end portion of one of the sheet metal segments of the first core sheet having.
  • transformer cores made of core sheets are assembled in layers in Hochnapsstransformatorbau.
  • the use of the core sheets creates a preferred magnetic direction along the sheets and reduces the magnetic flux induced eddy currents within the transformer core.
  • the core sheets are usually composed of sheet metal segments, in particular the sheet metal forms MI, EI, II or UI are used.
  • the composite sheet metal segments then form the respective core sheet, which is then assembled in layers to form a transformer core.
  • the layering of the core sheets takes place in such a manner that the sheet ends (the so-called core tips) are offset relative to each other in the sheet metal ends of the core segments to each other.
  • This can be done in the form of a so-called alternating layering or a so-called step-lap layering, as this causes the effective cross-section reduced at the joints and thus has a positive effect on reducing the magnetic losses.
  • a layered transformer is quieter than a transformer core stacked directly on top of each other.
  • sectional shapes of the sheet metal segments which form abutting edges on the basis of positive-fit composite cut edges, wherein the abutting edges extend at an angle of 45 ° with respect to the longitudinal direction of the end region of one of the sheet metal segments.
  • tips on the sheet ends of the sheets of the outer leg or the yokes on or on the inside of the core window are by the staggering of the core sheets Aussparrungen.
  • a first sheet metal part has an E-shaped basic shape, which forms a second yoke of the core sheet with a second I-shaped sheet metal part.
  • DE 101 32 719 A1 a method for manufacturing electrical core sheet assemblies.
  • electrical core sheets are cut to the desired shape, the side surfaces or the cut edges of the cut core sheets first with a Covered corrosion protection layer and then assembled.
  • the transformer core is composed of the respectively stratified legs and yokes of the transformer core, the ends of the respective legs and yokes being stacked in a respectively corresponding manner.
  • the object of the present invention is to provide a transformer core which can be produced quickly and easily and has improved corrosion protection properties.
  • a second core sheet consists of at least two sheet segments of straight edges corresponding to the end portions, wherein the composite straight cut edges form a second straight edge and the second straight edge of the second core sheet a from the angle of the first straight edge of the first core sheet deviating angle to the longitudinal direction of the end portion of one of the sheet metal segments.
  • the core laminations are stacked with deviating angles ⁇ 1 , ⁇ 2 of the abutting edges with respect to the longitudinal regions of the end region of the respective composite sheet metal segments of the respective core laminations in an alternating sequence of the core laminations to form a transformer core. It is advantageous if the proportion of the core sheets with an angle ⁇ 1 of 45 ° of the abutting edge based on the proportion of other core sheets with a different angle ⁇ 2 , for example, of 90 °, the abutting edges occupies the highest proportion, with three different sheet lengths be used.
  • ⁇ 1 begins and ends a sequence of three core sheets and a core sheet, each of which has an angle ⁇ 1 of 45 ° of the abutting edge and enclosing a core sheet with an angle ⁇ 2 of 90 ° of the abutting edge.
  • An alternating sequence of three core laminations each as a sequence unit for three sequence runs would show the following lamination sequence relative to the respective angles ⁇ 1 of 45 ° and ⁇ 2 of 90 ° of the abutting edges: ⁇ 1 , ⁇ 2 , ⁇ 1 , ⁇ 1 , ⁇ 2 , ⁇ 1 , ⁇ 1 , ⁇ 2 , ⁇ 1 .
  • the respective abutting edges of the respective further core sheets with respect to the abutting edge of the first core sheet are advantageously arranged next to one another.
  • the respective abutting edges of the respective further core sheets are offset with respect to their position of the center of the respective abutting edges in the longitudinal direction of the respective end region of one of the sheet metal segments with respect to the abutting edge of the first core sheet.
  • the angle ⁇ 1 of the first abutting edge of the first core sheet is about 45 degrees with respect to the longitudinal direction of the end portion of one of the core segments of the first core sheet
  • the second core sheet has the abutting edge at an angle ⁇ 2 of 0 degrees with respect to the longitudinal direction of the end portion of one of the core sheets of the second core sheet and the first and second core sheets are disposed immediately adjacent to each other.
  • the angle ⁇ 1 of the first abutting edge of the first core sheet is about 45 degrees with respect to the longitudinal direction of the end portion of one of the core segments of the first core sheet and the second core sheet has the abutting edge at an angle ⁇ 2 of 90 degrees with respect to the longitudinal direction of the end portion of one of Core sheets of the second core sheet on and the first and the second core sheet are arranged directly next to each other.
  • the first core sheet is advantageously made of at least three core sheet segments, between the first core sheet segment and the second core sheet segment form-fitting an abutment edge is formed at an angle ⁇ 1 of 45 degrees and the composite first and second core sheet segment positively a straight abutment edge with the third core sheet segment at an angle ⁇ 2 of 0 degrees in the longitudinal direction of the end portion of the third core sheet segment.
  • This combination of the sheet metal segments to a core sheet is particularly suitable as a structure of the middle yoke of the respective core sheet.
  • the second core sheet consisting of two core sheet segments form-fitting forms a straight abutment edge at an angle ⁇ 1 of 45 degrees relative to the longitudinal direction of the end region of the second core sheet segment.
  • the sheet metal segments to form a middle yoke of a core sheet can form different angles of the form-fitting assembled from the cut edges abutting edges by the respective coordinated cut edges of the individual sheet segments and thus provide a simple to manufacture and loss minimizing transformer core.
  • the angle ⁇ 1 of the abutting edge of the first core sheet is about 45 degrees with respect to the longitudinal direction of the end portion of one of the core segments of the first core sheet and the second core sheet has a straight abutment edge at an angle ⁇ 2 of 0 or 90 degrees with respect to the longitudinal direction the end portion of one of the core segments of the second core sheet and the second core sheet is disposed immediately adjacent to the first core sheet.
  • first core sheet with an angle ⁇ 1 of the abutting edge of about 0 degrees and a second core sheet with a straight abutment edge of the second core sheet with an angle ⁇ 2 of about 90 degrees and a third core sheet with an angle ⁇ 3 the abutting edge of the third core sheet of about 45 degrees are arranged in an alternating sequence.
  • the transformer core consists in an advantageous embodiment of the first core sheet with at least three core sheet segments, between the first core sheet segment and the second core sheet segment positively a straight abutment edge is formed at an angle ⁇ 1 of 45 degrees and the composite first and second core sheet segment form fit a straight abutting edge having the third core sheet segment at an angle ⁇ 2 of 0 degrees in the longitudinal direction of the end portion of the third core sheet segment.
  • the sheet metal segments consist of cold-rolled grain-oriented iron sheets
  • FIGS. 6 and 8th show embodiments of the prior art.
  • the FIG. 1 shows a section of a core sheet 10, wherein the section represents the upper left corner connecting the upper yoke with the left leg.
  • a first sheet metal segment 11 of the core sheet 10 forms part of the upper yoke and a second sheet metal segment 12 of the core sheet 10 forms the left leg of the transformer core 1 (not shown).
  • the sheet metal segments 11, 12 each have a cutting edge on, the form-fitting forms a straight abutment edge 2 of the core sheet 10.
  • the FIG. 1 is the angle ⁇ 1 45 ° relative to the longitudinal direction of the first sheet segment 11. This angle ⁇ 1 is indicated by corresponding dashed lines in the FIG. 1 shown. Because the FIG.
  • corresponding straight abutting edges 2 may be arranged in each of the corners and as the center leg of the transformer core 1. Furthermore, only two sheet metal segments 11 and 12 may be formed in an L-shaped form, so that the respective core sheet 10 only consists of two sheet metal segments 11, 12.
  • FIG. 2 again shows a section of the core sheet as a connection of the upper yoke with the left leg, now now between the first sheet segment 11 as part of the upper yoke and the second sheet segment 12 as part of the left leg of the transformer core, the straight edge 2 at an angle ⁇ 2 of 90 ° passes.
  • FIG. 4 is an angle between the first sheet metal segment 11 and second sheet segment 12 of the core sheet 10 of the straight abutment edge 2 of 60 °; in the FIG. 5 between the first sheet metal segment 11 and the second sheet metal segment 12 of the core sheet 10, a straight abutment edge 2 at an angle of 30 °.
  • FIG. 6 shows a stepped abutting edge between the first sheet metal segment 11 and the second sheet metal segment 12 of the core sheet 10th
  • FIG. 7 a section of the transformer core 1 is shown. Shown are the core sheets 10, 110, 210, 310, 410, 510, 610, 710 in the upper left corner of the transformer core 1, so that only parts of the upper yoke and the left leg of the transformer core 1 are visible.
  • the core sheets 10, 110, 210, 310, 410, 510, 610, 710 are layered in an alternating sequence such that in each case a core sheet 10 has an abutment edge 2 at an angle of ⁇ 1 of 45 ° and an immediately adjacent core sheet 110 a Angle ⁇ 2 of the straight abutting edge 102 also 45 °.
  • a core plate 310 and 410 with an angle of the straight abutment edge 302, 402 ⁇ 4 and ⁇ 5, each of 45 °.
  • FIG. 8 shows a section of the left upper corner of a transformer core 1 as a connection between the upper yoke and the left leg.
  • the FIG. 8 alternating core plates 10, 210 with an angle ⁇ 1 , ⁇ 3 of 60 ° of the respective straight abutment edge 2, 202 compared to core plates 110, 310 with an angle ⁇ 2 , ⁇ 4 of the straight abutment edge 2, 102, 302 of 45 ° from.
  • FIG. 9 is a further combination of different angles of the straight abutment edge 2 relative to a longitudinal direction of the sheet metal segments 11 (not shown) shown.
  • the upper left corner of a transformer core 1 is shown as staggered lamination.
  • FIG. 7, FIG. 8 and FIG. 9 show the core sheets 10, 110, 210, 310, 410, 510, 610 in a staggered manner for better visibility.
  • a transformer core 1 produced by the method according to the invention can therefore either have a round shape indicated round shape due to the length ratios of the core sheets 10, 110, 210, 310, 410, 510, 610 or define a completely rectangular structure of the transformer core 1.
  • the edges of the transformer core 1 therefore become almost flat, so that a susceptibility to corrosion due to existing gaps just would not exist.
  • FIG. 10 shows a section of the core sheet 10 as a connection of the upper yoke with the middle leg of a three-phase transformer core.
  • a first sheet metal segment 11 of the core sheet 10 has a straight cutting edge which has a first straight abutting edge 2a of the core sheet 10 in a form-fitting manner with a corresponding cutting edge of a second core sheet 12.
  • the so assembled sheets of the segments 11, 12 partially define a cutting edge, the form-fitting with a corresponding cutting edge of another sheet segment 13 defines a straight abutment edge at an angle of 90 ° with respect to the longitudinal direction of the first sheet segment 11.
  • the composite sheet metal segments 11, 12, 13 therefore have the two abutting edges 2, 2a. Other angles of the straight abutting edges 2, 2a are easily implementable according to the present invention.
  • FIG. 11 a detail of a transformer core 1 according to the invention, in which a variety of core sheets 10, 110, 210, 310 are combined.
  • the Indian FIG. 11 1 shows in turn the cross-shaped part of the upper yoke in connection with the middle leg of a polyphase transformer core 1.
  • a first conception of a core sheet 10 of a continuous first sheet metal segment 11 (not shown) as a continuous upper yoke with a right angle adjoining the middle leg as a second core plate 12 (also not shown) combined.
  • the thus designed first core sheet 10 is layered in the context of the inventive method next to a second core sheet 110, wherein the second core sheet 110 has sheet metal segments 11, 12, 13 (not shown) which have two abutting edges 2, 2a at an angle ⁇ 1 of 45 ° and ⁇ 2 of 90 °.
  • the fourth core sheet 310 is mirrored in design with the second core sheet 110.
  • FIG. 12 For example, the upper portion of a transformer core 1 with partial center leg, left outer leg and upper yoke is visible. Shown in FIG. 12 is the layering of the transformer core 1 with respect to the different core laminations 10, 110, 210, 310, 410, 510.
  • the first core sheet 10 at least three sheet metal segments 11, 12, 13, wherein the abutting edge 2, 2a of the upper yoke has two angles of ⁇ 45 ° and the straight abutment edge 2a between the first and second sheet metal segment 11, 12, an angle of 45 °.
  • the next core sheet 110 (not shown) has a cutting edge 102 at an angle of 45 ° between the first sheet metal segment 11 and the third sheet metal segment 13 of the connection between the upper yoke and the middle leg. Furthermore, the left leg is joined as a second sheet segment 12 with the first sheet metal segment 11 as an upper yoke over an angle of 45 ° of the abutting edge 202 in a form-fitting manner.
  • the abutting edge 202, 202a and 202b of the third core sheet 210 (not shown) extend at an angle of 90 ° and 45 °, respectively.
  • the sheet segments 11, 12 are connected between the upper yoke and the left leg via a 90 ° impact edge 202a.
  • a part of the upper yoke is also the first sheet metal segment 11 at an angle of 90 ° with the third sheet metal segment 13 as part of the middle leg an angle of 90 ° form-fitting assembled.
  • the third sheet metal segment 13 additionally has a cutting edge at an angle of 45 °, which forms a third edge (202) in a form-fitting manner with a corresponding cutting edge of a fourth sheet metal segment (not shown).
  • the further abutting edges in the illustrated example 302, 302a, 402, 402a, 502 and 502a of the fourth to sixth core laminations 310, 410, 510 extend at an angle of 45 ° in each case. Furthermore, in the presentation of the FIG. 12 a minimal offset of the equally extending abutting edges 102, 302, 402, 502 and 102, 302a, 402a and 502a visible, so that the inventive method can be used in the coating of conventional transformers and the disturbing influences of corresponding core tips is avoided.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Coils Or Transformers For Communication (AREA)
EP08735299A 2008-04-10 2008-04-10 Transformatorkern Active EP2260494B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/003074 WO2009124574A1 (de) 2008-04-10 2008-04-10 Verfahren zur herstellung eines transformatorkerns, sowie einem transformatorkern

Publications (2)

Publication Number Publication Date
EP2260494A1 EP2260494A1 (de) 2010-12-15
EP2260494B1 true EP2260494B1 (de) 2013-03-20

Family

ID=40122311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08735299A Active EP2260494B1 (de) 2008-04-10 2008-04-10 Transformatorkern

Country Status (5)

Country Link
US (1) US8212645B2 (pt)
EP (1) EP2260494B1 (pt)
BR (1) BRPI0822583B8 (pt)
CA (1) CA2721012C (pt)
WO (1) WO2009124574A1 (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008049432B4 (de) * 2008-09-25 2018-02-08 Siemens Aktiengesellschaft Leistungsschalter und Stromwandler für einen Leistungsschalter

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11049647B2 (en) 2018-04-23 2021-06-29 Siemens Energy Global GmbH & Co. KG Molded tap changer assemblies and methods for dry-type transformers
CA3097935C (en) 2018-04-23 2022-08-23 Siemens Aktiengesellschaft Transformer cores and assembly methods thereof for high efficiency and high anti-corrosion performance
DE102018112245A1 (de) 2018-05-22 2019-11-28 Borgwarner Ludwigsburg Gmbh Verfahren zur Montage eines Magnetkerns für einen Transformator sowie Magnetkern für einen Transformator

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Publication number Priority date Publication date Assignee Title
DE102008049432B4 (de) * 2008-09-25 2018-02-08 Siemens Aktiengesellschaft Leistungsschalter und Stromwandler für einen Leistungsschalter

Also Published As

Publication number Publication date
BRPI0822583A2 (pt) 2021-04-13
WO2009124574A1 (de) 2009-10-15
CA2721012C (en) 2017-03-07
US8212645B2 (en) 2012-07-03
CA2721012A1 (en) 2009-10-15
EP2260494A1 (de) 2010-12-15
BRPI0822583B8 (pt) 2023-04-25
BRPI0822583B1 (pt) 2021-09-28
US20110032069A1 (en) 2011-02-10

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