EP2260494B1 - Transformer core - Google Patents

Transformer core 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
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EP
European Patent Office
Prior art keywords
core
sheet
angle
edge
straight
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EP08735299A
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German (de)
French (fr)
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EP2260494A1 (en
Inventor
Martin Alsina Navarro
Fritz Sorg
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Siemens AG
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Siemens AG
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00Cores, Yokes, or armatures
    • H01F3/02Cores, Yokes, or armatures made from sheets
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/24Magnetic cores
    • H01F27/26Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263Fastening parts of the core together
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49002Electrical device making
    • Y10T29/4902Electromagnet, 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)

Description

Die Erfindung betrifft einen Transformatorkern, wobei der Transformatorkern aus Kernblechen schichtweise zusammengesetzt und mindestens ein Kernblech aus mindestens zwei Blechsegmenten gebildet wird. Ein Endbereich des ersten Blechsegmentes weist eine gerade Schnittkante auf, wobei die gerade Schnittkante des ersten Blechsegmentes mit einer korrespondierenden geraden Schnittkante eines Endbereichs des zweiten Blechsegments formschlüssig eine gerade Stoßkante bildet und die gerade Stoßkante einen Winkel relativ zur Längsrichtung des Endbereichs eines der Blechsegmente des ersten Kernbleches aufweist.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.

Üblicherweise werden im Hochspannungstransformatorbau Transformatorkerne aus Kernblechen schichtweise zusammengesetzt. Die Verwendung der Kernbleche erzeugt eine magnetische Vorzugsrichtung entlang der Bleche und reduziert die durch den magnetischen Fluss induzierten Wirbelströme innerhalb des Transformatorkerns. Die Kernbleche sind üblicherweise aus Blechsegmenten zusammengesetzt, wobei insbesondere die Blechformen MI, EI, II oder UI zur Anwendung kommen. Die zusammengesetzten Blechsegmente bilden dann das jeweilige Kernblech, das dann schichtweise zu einem Transformatorkern zusammengesetzt wird.Usually transformer cores made of core sheets are assembled in layers in Hochspannungstransformatorbau. 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.

Die Schichtung der Kernbleche erfolgt in der Art und Weise, dass die Blechenden (die so genannten Kernspitzen) relativ zueinander in den Blechenden der Kernsegmente zueinander versetzt sind. Dies kann in Form einer so genannten Wechselschichtung beziehungsweise einer so genannten Step-Lap-Schichtung erfolgen, da sich hierdurch der effektive Querschnitt an den Stoßstellen verringert und damit sich positiv auf eine Reduzierung der magnetischen Verluste auswirkt. Des Weiteren ist ein so geschichteter Transformator während des Betriebs leiser, als ein unmittelbar aufeinander geschichteter Transformatorkern.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. Furthermore, during operation, such a layered transformer is quieter than a transformer core stacked directly on top of each other.

Bei Leistungstransformatoren werden bevorzugt Schnittformen der Blechsegmente eingesetzt, die Stoßkanten aufgrund von formschlüssigen zusammengesetzten Schnittkanten bilden, wobei die Stoßkanten unter einem Winkel von 45° bezogen auf die Längsrichtung des Endbereiches eines der Blechsegmente verlaufen. Üblicherweise stehen Spitzen an den Blechenden der Bleche der Außenschenkel oder der Joche über bzw. an der Innenseite des Kernfensters befinden sich durch die Staffelung der Kernbleche Aussparrungen.In power transformers, it is preferred to use 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. Usually are 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.

Nachteilig hierbei ist, dass diese Überlappungsstellen und Aussparungen Hohlräume bilden, die insbesondere bei Trockentransformatoren zu Feuchtigkeitsablagerungen und damit zur Korrosion führen.The disadvantage here is that these overlapping points and recesses form cavities, which lead to moisture deposits and thus to corrosion especially in dry-type transformers.

Im Stand der Technik beschreibt beispielsweise die EP 1 655 747 A2 einen Blechschnitt für einen geschichteten Kern eines Transformators. Gemäß der dortigen Erfindung weist ein erstes Blechteil eine E-förmige Grundformung auf, die mit einem zweiten I-förmigen Blechteil ein zweites Joch des Kernbleches bildet.
Des Weiteren beschreibt die DE 101 32 719 A1 ein Verfahren zur Fertigung elektrischer Kernblech-Baugruppen. Gemäß der dortigen Erfindung werden mit einer Korrosionsschicht versehenen elektrischen Kernbleche auf die jeweils gewünschte Form geschnitten, wobei die Seitenflächen beziehungsweise die Schnittkanten der geschnittenen Kernbleche zuerst mit einer Korrosionsschutzschicht überzogen und anschließend zusammengesetzt werden.
In the prior art, for example, describes the EP 1 655 747 A2 a sheet metal section for a layered core of a transformer. According to the local invention, 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.
Furthermore, the describes DE 101 32 719 A1 a method for manufacturing electrical core sheet assemblies. According to the local invention, provided with a corrosion layer 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.

Des Weiteren beschreibt die WO 2006/105024 A2 einen Transformator mit geschichtetem Kern und einem kreuzförmigen Schenkel. Gemäß der dortigen Erfindung wird der Transformatorkern aus dem jeweils geschichteten Schenkel und Jochen des Transformatorkerns zusammengesetzt, wobei die Enden der jeweiligen Schenkel und Joche in einer jeweils korrespondierenden Art und Weise geschichtet sind.Furthermore, the describes WO 2006/105024 A2 a stratified core transformer with a cross-shaped leg. According to the invention there, 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.

Des Weiteren beschreibt die WO 00/49628 einen geschichteten Transformatorkern mit einer alternierenden Abfolge von S-förmigen Ausförmungen.Furthermore, the describes WO 00/49628 a layered transformer core with an alternating sequence of S-shaped formations.

Aufgabe der vorliegenden Erfindung ist es, einen schnell und einfach herzustellenden Transformatorkern bereitzustellen, der verbesserte Korrosionsschutzeigenschaften besitzt.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.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass ein zweites Kernblech aus mindestens zwei Blechsegmenten aus an den Endbereichen korrespondierenden geraden Schnittkanten besteht, wobei die zusammengesetzten geraden Schnittkanten eine zweite gerade Stoßkante bilden und die zweite gerade Stoßkante des zweiten Kernbleches einem vom Winkel der ersten geraden Stoßkante des ersten Kernbleches abweichenden Winkel zur Längsrichtung des Endbereiches eines der Blechsegmente aufweist. Durch die Verwendung von Kernblechen mit einer jeweils anderen Winkelorientierung der Stoßkante können auf der einen Seite magnetische Verluste, wie bei einer herkömmlichen Schichtungstechnik, vermieden werden. Gleichzeitig kann der durch die herkömmlichen Schichtungstechniken entstehende Zwischenraum zwischen den einzelnen Kernblechpaketen minimiert und damit ebenfalls die Korrosionsanfälligkeit vermindert beziehungsweise vollständig vermieden werden.According to the invention, the object is achieved in that 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. By using core sheets with a different angular orientation of the abutting edge, magnetic losses can be avoided on the one hand, as in a conventional stratification technique. At the same time, the space between the individual core lamination packages created by the conventional layering techniques can be minimized and thus also the susceptibility to corrosion is reduced or completely avoided.

Die ausschließliche Verwendung von Blechsegmenten mit 0° bzw. 90° Schnittkanten zur Schichtung eines Transformatorskerns ist nicht vorteilhaft, da hierdurch höhere Leerlaufverluste des Transformators entstehen würden. Durch die Schichtung von Kernblechen mit unterschiedlich orientierten Stoßkanten, insbesondere mit einer abwechselnden Orientierung zwischen 45° und 90° bzw. 0°, können die korrosionsverursachenden Kernspitzen entfallen und gleichzeitig entstehen geringere Leerlaufverluste innerhalb des Transformatorkerns im Vergleich zu ausschließlich rechtwinklig zusammengesetzten Kernblechen.The exclusive use of sheet metal segments with 0 ° or 90 ° cutting edges for stratifying a transformer core is not advantageous, as this would result in higher no-load losses of the transformer. By laminating core laminates with differently oriented abutting edges, in particular with an alternating orientation between 45 ° and 90 ° or 0 °, the corrosion-causing core tips can be dispensed with and at the same time lower no-load losses occur within the transformer core compared to exclusively rectangularly assembled core laminations.

Es wird als Vorteil angesehen, dass die Kernbleche mit abweichenden Winkeln Φ1, Φ2 der Stoßkanten bezogen auf die Längsbereiche des Endbereichs der jeweils zusammengesetzten Blechsegmente der jeweiligen Kernbleche in einer alternierenden Abfolge der Kernbleche zu einem Transformatorkern geschichtet werden. Es ist von Vorteil, wenn der Anteil der Kernbleche mit einen Winkel Φ1 von 45° der Stoßkante bezogen auf den Anteil der weiteren Kernbleche mit einem abweichenden Winkel Φ2, beispielsweise von 90°, der Stoßkanten den höchsten Anteil einnimmt, wobei drei unterschiedliche Blechlängen zum Einsatz kommen. Idealerweise beginnt und endet eine Abfolge von drei Kernblechen mit einem Kernblech, das jeweils einen Winkel Φ1 von 45° der Stoßkante aufweist und ein Kernblech mit einem Winkel Φ2 von 90° der Stoßkante einschließt. Eine alternierende Abfolge von jeweils drei Kernblechen als Abfolgeeinheit für drei Abfolgendurchläufe würde folgende Schichtungsabfolge bezogen auf die jeweiligen Winkel Φ1 von 45° und Φ2 von 90° der Stoßkanten zeigen: Φ1 , Φ21, Φ1, Φ2, Φ1, Φ1, Φ2, Φ1.It is regarded as an advantage that the core laminations are stacked with deviating angles Φ 1 , Φ 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 Φ 1 of 45 ° of the abutting edge based on the proportion of other core sheets with a different angle Φ 2 , for example, of 90 °, the abutting edges occupies the highest proportion, with three different sheet lengths be used. Ideally, begins and ends a sequence of three core sheets and a core sheet, each of which has an angle Φ 1 of 45 ° of the abutting edge and enclosing a core sheet with an angle Φ 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 Φ 1 of 45 ° and Φ 2 of 90 ° of the abutting edges: Φ 1 , Φ 2 , Φ 1 , Φ 1 , Φ 2 , Φ 1 , Φ 1 , Φ 2 , Φ 1 .

Die jeweiligen Stoßkanten der jeweiligen weiteren Kernbleche bezogen auf die Stoßkante des ersten Kernbleches werden vorteilhafterweise nebeneinander angeordnet.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.

In einer vorteilhaften Ausgestaltung des Verfahrens ist vorgesehen, dass die jeweiligen Stoßkanten der jeweiligen weiteren Kernblechen bezogen auf die Stoßkante des ersten Kernbleches bezüglich ihrer Position des Mittelpunktes der jeweiligen Stoßkanten in der Längsrichtung des jeweiligen Endbereichs eines der Blechsegmente gegeneinander versetzt sind. Die Nutzung von bekannten Schichtungen, wie der Step-Lap-Schichtung, ohne gleichzeitig die damit in der Vergangenheit gleichzeitig genutzten Kernspitzen zu verwenden, führt zu einer Reduzierung der magnetischen Verluste bei gleichzeitig nur geringfügig erhöhten Risiko einer Korrosion in den Aussparrungen.In an advantageous embodiment of the method, it is provided that 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 use of known laminations, such as the step-lap layering, without simultaneously using the same time used in the past core tips, leads to a reduction in magnetic losses with only slightly increased risk of corrosion in the Aussparrungen.

Der Winkel Φ1 der ersten Stoßkante des ersten Kernblechs ist ungefähr 45 Grad bezogen auf die Längsrichtung des Endbereichs eines der Kernsegmente des ersten Kernblechs und das zweite Kernblech weist die Stoßkante in einem Winkel Φ2 von 0 Grad bezogen auf die Längsrichtung des Endbereichs eines der Kernbleche des zweiten Kernblechs auf und das erste und das zweite Kernblech werden unmittelbar nebeneinander angeordnet. Alternativ ist der Winkel Φ1 der ersten Stoßkante des ersten Kernblechs ungefähr 45 Grad bezogen auf die Längsrichtung des Endbereichs eines der Kernsegmente des ersten Kernblechs und das zweite Kernblech weist die Stoßkante in einem Winkel Φ2 von 90 Grad bezogen auf die Längsrichtung des Endbereichs eines der Kernbleche des zweiten Kernblechs auf und das erste und das zweite Kernblech werden unmittelbar nebeneinander angeordnet.The angle Φ 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 Φ 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. Alternatively, the angle Φ 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 Φ 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.

In einer vorteilhaften Ausgestaltung des Verfahrens werden die Kernbleche mit einem Winkel der Stoßkante von jeweils Φ1 =0 Grad, Φ2 =45 Grad und Φ3 =90 Grad nebeneinander und als zusammengesetzte Kernbleche in einer alternierenden Abfolge angeordnet.In an advantageous embodiment of the method, the core sheets with an angle of the abutting edge of each Φ 1 = 0 degrees, Φ 2 = 45 degrees and Φ 3 = 90 degrees are arranged side by side and as composite core sheets in an alternating sequence.

Das erste Kernblech besteht vorteilhafterweise aus mindestens drei Kernblechsegmenten, wobei zwischen dem ersten Kernblechsegment und dem zweiten Kernblechsegment formschlüssig eine Stoßkante in einem Winkel Φ1 von 45 Grad ausgebildet wird und das zusammengesetzte erste und zweite Kernblechsegment formschlüssig eine gerade Stoßkante mit dem dritten Kernblechsegment in einem Winkel Φ2 von 0 Grad in Längsrichtung des Endbereichs des dritten Kernblechsegmentes aufweist. Diese Kombination der Blechsegmente zu einem Kernblech ist insbesondere als Aufbau des mittleren Joches des jeweiligen Kernblechs geeignet. Das zweite Kernblech bestehend aus zwei Kernblechsegmenten bildet formschlüssig eine gerade Stoßkante in einem Winkel Φ1 von 45 Grad bezogen auf die Längsrichtung des Endbereichs des zweiten Kernblechsegments. Die Blechsegmente zur Bildung eines Mitteljoches eines Kernblechs können durch die jeweils aufeinander abgestimmten Schnittkanten der einzelnen Blechsegmente unterschiedliche Winkel der aus den Schnittkanten formschlüssig zusammengesetzten Stoßkanten bilden und somit einen einfach herzustellenden und verlustminimierenden Transformatorkern bereitstellen.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 Φ 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 Φ 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 Φ 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.

vorteilhafterweise ist der Winkel Φ1 der Stoßkante des ersten Kernbleches ungefähr 45 Grad bezogen auf die Längsrichtung des Endbereichs eines der Kernsegmente des ersten Kernbleches und das zweite Kernblech weist eine gerade Stoßkante in einem Winkel Φ2 von 0 oder 90 Grad bezogen auf die Längsrichtung des Endbereichs eines der Kernsegmente des zweiten Kernbleches auf und das zweite Kernblech ist unmittelbar neben dem ersten Kernblech angeordnet.Advantageously, the angle Φ 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 Φ 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.

Es wird als Vorteil angesehen, dass das erste Kernblech mit einem Winkel Φ1 der Stoßkante von ungefähr 0 Grad und einem zweiten Kernblech mit einer geraden Stoßkante des zweiten Kernblechs mit einem Winkel Φ2 von ungefähr 90 Grad und einem dritten Kernblech mit einem Winkel Φ3 der Stoßkante des dritten Kernblechs von ungefähr 45 Grad in einer alternierenden Abfolge angeordnet sind.It is considered an advantage that the first core sheet with an angle Φ 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 Φ 2 of about 90 degrees and a third core sheet with an angle Φ 3 the abutting edge of the third core sheet of about 45 degrees are arranged in an alternating sequence.

Der Transformatorkern besteht in einer vorteilhaften Ausgestaltung aus dem erste Kernblech mit mindestens drei Kernblechsegmenten, wobei zwischen dem ersten Kernblechsegment und dem zweiten Kernblechsegment formschlüssig eine gerade Stoßkante in einem Winkel Φ1 von 45 Grad ausgebildet wird und das zusammengesetzte erste und zweite Kernblechsegment formschlüssig eine gerade Stoßkante mit dem dritten Kernblechsegment in einem Winkel Φ2 von 0 Grad in Längsrichtung des Endbereichs des dritten Kernblechsegmentes aufweist.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 Φ 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 Φ 2 of 0 degrees in the longitudinal direction of the end portion of the third core sheet segment.

Vorteilhafterweise bestehen die Blechsegmente aus kaltgewalzten kornorientierten EisenblechenAdvantageously, the sheet metal segments consist of cold-rolled grain-oriented iron sheets

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen beschrieben. Der Gegenstand der Erfindung wird anhand der nachfolgenden Zeichnungen anhand ausgewählter Ausführungsbeispielen näher erläutert. Es zeigt:

Fig. 1
Ausschnitt des Kernblechs als Verbindung des oberen Joches mit dem linken Schenkel mit einem Winkel Φ1 von 45 Grad der Stoßkante;
Fig. 2
Ausschnitt des Kernblechs als Verbindung des oberen Joches mit dem linken Schenkel mit einem Winkel Φ2 von 90 Grad der Stoßkante;
Fig. 3
Ausschnitt des Kernblechs als Verbindung des oberen Joches mit dem linken Schenkel mit einem Winkel Φ1 von 0 Grad der Stoßkante;
Fig. 4
Ausschnitt des Kernblechs als Verbindung des oberen Joches mit dem linken Schenkel mit einem Winkel Φ1 von 60 Grad der Stoßkante;
Fig. 5
Ausschnitt des Kernblechs als Verbindung des oberen Joches mit dem linken Schenkel mit einem Winkel Φ1 von 30 Grad der Stoßkante;
Fig. 6
Ausschnitt eines Kernblechs als Verbindung des oberen Joches mit dem linken Schenkel mit einer gestuften Stoßkante;
Fig. 7
Ausschnitt des Transformatorkerns mit einer alternierenden Abfolge von Kernblechen mit einem jeweiligen Winkel der Stoßkante der ersten beiden Kernbleche von Φ1 von 45 Grad und einem jeweiligen Winkel der Stoßkante eines weiteren Kernblechs von Φ2 von 0 Grad oder 90 Grad;
Fig. 8
Ausschnitt eines Transformatorkerns mit einer alternierenden Abfolge von Kernblechen mit einem jeweiligen Winkel der Stoßkante von Φ1 von 60 Grad, Φ2 von 45 Grad;
Fig. 9
Ausschnitt des Transformatorkerns mit einer alternierenden Abfolge von Kernblechen mit einem jeweiligen Winkel der Stoßkante von Φ1 von 90 Grad, Φ2 von 0 Grad und Φ1 von 45 Grad;
Fig. 10
Ausschnitt des Kernblech als Verbindung des oberen Joches mit dem mittleren Schenkel mit einem Winkel Φ1 von 90 Grad der ersten und von Φ2 von 45 Grad der zweiten Stoßkante;
Fig. 11
Ausschnitt des Transformatorkerns mit einer alternierenden Abfolge von Kernblechen mit einem jeweiligen Winkel der ersten Stoßkante von Φ1 von 45 Grad, Φ2 von 90 Grad des ersten Kernblechs und einem jeweiligen Winkel der ersten Stoßkante von Φ1 von 90 Grad des zweiten Kernblechs;
Fig. 12
Ausschnitt des Transformatorkerns bezüglich des linken und des mittleren Schenkels zum oberen Joch mit einer alternierenden Abfolge von Kernblechen.
Further advantageous embodiments of the invention are described in the subclaims. The object of the invention will be explained in more detail with reference to the following drawings with reference to selected embodiments. It shows:
Fig. 1
Section of the core sheet connecting the upper yoke with the left leg with an angle Φ 1 of 45 degrees of the abutting edge;
Fig. 2
Section of the core sheet as connection of the upper yoke with the left leg with an angle Φ 2 of 90 degrees of the abutting edge;
Fig. 3
Section of the core sheet connecting the upper yoke with the left leg with an angle Φ 1 of 0 degrees of the abutting edge;
Fig. 4
Section of the core sheet connecting the upper yoke with the left leg with an angle Φ 1 of 60 degrees of the abutting edge;
Fig. 5
Section of the core sheet connecting the upper yoke with the left leg at an angle Φ 1 of 30 degrees of the abutting edge;
Fig. 6
Section of a core sheet connecting the upper yoke with the left leg with a stepped abutting edge;
Fig. 7
Section of the transformer core with an alternating sequence of core sheets with a respective angle of the abutting edge of the first two core sheets of Φ 1 of 45 degrees and a respective angle of the abutment edge of another core sheet of Φ 2 of 0 degrees or 90 degrees;
Fig. 8
Section of a transformer core with an alternating sequence of core laminations with a respective angle of the abutting edge of Φ 1 of 60 degrees, Φ 2 of 45 degrees;
Fig. 9
Section of the transformer core with an alternating sequence of core laminations with a respective angle of the abutting edge of Φ 1 of 90 degrees, Φ 2 of 0 degrees and Φ 1 of 45 degrees;
Fig. 10
Section of the core sheet connecting the upper yoke with the middle leg at an angle Φ 1 of 90 degrees of the first and Φ 2 of 45 degrees of the second edge;
Fig. 11
Section of the transformer core with an alternating sequence of core sheets with a respective angle of the first abutment edge of Φ 1 of 45 degrees, Φ 2 of 90 degrees of the first core sheet and a respective angle of the first abutment edge of Φ 1 of 90 degrees of the second core sheet;
Fig. 12
Section of the transformer core with respect to the left and the middle leg to the upper yoke with an alternating sequence of core sheets.

Die Figuren 6 und 8 zeigen dabei Ausführungsformen aus dem Stand der Technik.The FIGS. 6 and 8th show embodiments of the prior art.

Die Figur 1 zeigt einen Ausschnitt eines Kernblechs 10, wobei der Ausschnitt die obere linke Ecke als Verbindung des oberen Jochs mit dem linken Schenkel darstellt. Ein erstes Blechsegment 11 des Kernblechs 10 bildet einen Teil des oberen Joches und ein zweites Blechsegment 12 des Kernblechs 10 bildet den linken Schenkel des Transformatorkerns 1 (nicht dargestellt). Die Blechsegmente 11, 12 weisen jeweils eine Schnittkante auf, die formschlüssig eine gerade Stoßkante 2 des Kernblechs 10 bildet. Im dargestellten Beispiel der Figur 1 ist der Winkel Φ1 45° bezogen auf die Längsrichtung des ersten Blechsegmentes 11. Dieser Winkel Φ1 ist durch entsprechende gestrichelte Linien in der Figur 1 dargestellt. Da die Figur 1 lediglich einen Ausschnitt des Kernbleches 10 darstellt, können entsprechende gerade Stoßkanten 2 in jeder der Ecken sowie als Mittelschenkel des Transformatorkerns 1 angeordnet sein. Des Weiteren können lediglich zwei Blechsegmente 11 und 12 in einer L-förmigen Form ausgebildet sein, so dass das jeweilige Kernblech 10 lediglich aus zwei Blechsegmenten 11, 12 besteht.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. In the example shown the FIG. 1 is the angle Φ 1 45 ° relative to the longitudinal direction of the first sheet segment 11. This angle Φ 1 is indicated by corresponding dashed lines in the FIG. 1 shown. Because the FIG. 1 represents only a section of the core sheet 10, 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.

Die Figur 2 zeigt wiederum einen Ausschnitt des Kernbleches als Verbindung des oberen Joches mit dem linken Schenkel, wobei nunmehr zwischen dem ersten Blechsegment 11 als Teil des oberen Joches und dem zweiten Blechsegment 12 als Teil des linken Schenkels des Transformatorkerns die gerade Stoßkante 2 in einem Winkel Φ2 von 90° verläuft. Im Gegensatz dazu ist in der Figur 3 ein Winkel Φ1 der geraden Stoßkante 2 zwischen dem ersten Blechsegment 11 und dem zweiten Blechsegment 12 des Kernblechs 10 von 0° eingezeichnet.The 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 Φ 2 of 90 ° passes. In contrast, in the FIG. 3 an angle Φ 1 of the straight abutting edge 2 between the first sheet metal segment 11 and the second sheet metal segment 12 of the core sheet 10 of 0 °.

In Figur 4 ist ein Winkel zwischen dem ersten Blechsegment 11 und zweiten Blechsegment 12 des Kernblechs 10 der geraden Stoßkante 2 von 60°; in der Figur 5 zwischen dem ersten Blechsegment 11 und dem zweiten Blechsegment 12 des Kernblechs 10 eine gerade Stoßkante 2 in einem Winkel von 30° eingezeichnet.In 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 °.

Die Ausführung in der Figur 6 zeigt eine gestufte Stoßkante zwischen dem ersten Blechsegment 11 und dem zweiten Blechsegment 12 des Kernblechs 10.The execution in the 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

In der Figur 7 ist ein Ausschnitt des Transformatorkerns 1 gezeigt. Dargestellt sind die Kernbleche 10, 110, 210, 310, 410, 510, 610, 710 in der oberen linken Ecke des Transformatorkerns 1, so dass lediglich Teile des oberen Jochs und des linken Schenkels des Transformatorkerns 1 sichtbar sind. Die Kernbleche 10, 110, 210, 310, 410, 510, 610, 710 sind in einer alternierenden Folge dergestalt geschichtet, dass jeweils ein Kernblech 10 eine Stoßkante 2 in einem Winkel von Φ1 von 45° aufweist und ein unmittelbar anschließendes Kernblech 110 einen Winkel Φ2 der geraden Stoßkante 102 von ebenfalls 45° aufweist. Daran schließt sich ein Kernblech 210 mit einem Winkel Φ3 mit einer Stoßkante 210 in einem Winkel von 90° oder von 0° an. Im gezeigten Beispiel der Figur 7 weist die gerade Stoßkante 102 einen Winkel von Φ3 = 90° auf. Hieran schließen sich als alternierende Folge wiederum ein Kernblech 310 und 410 mit einem Winkel der geraden Stoßkante 302, 402 Φ4 und Φ5 von jeweils 45° an. Daran folgt ein sechstes (das erste ist 10 und nicht 110) Kernblech 510, das im Winkel von Φs der geraden Stoßkante S02 zwischen dem ersten Blechsegment 11 (nicht explizit eingezeichnet) und im zweiten Blechsegment 12 (nicht explizit eingezeichnet) einschließt. Es folgt ein Kernblech 510 mit einem Winkel Φ6 von 0°. Hieran schließen sich wiederum zwei Kernbleche 610, 710 mit einem jeweiligen Winkel Φ7, 8 der geraden Stoßkante 2 von 45° an. Im Gegensatz zu dem im Stand der Technik bekannten Schichtungsverfahren, bei dem die jeweiligen Kernbleche 10, 110, 210, 410, 510, 610, 710 jeweils eine Kernspitze aufweisen und leicht gegeneinander versetzt angeordnet sind, können im vorliegenden Beispiel die Bleche schichtweise ohne vorstehende Spitzen zusammengestellt werden. Mittels der vorliegenden Erfindung entstehen gerade keine Kernspitzen mehr und damit auch keine Hohl- und Zwischenräume mehr, in denen sich Flüssigkeit sammeln und damit Korrosion verursachen kann. Gegenüber einem ausschließlich aus rechtwinkligen Blechsegmenten 11, 12, 13 geschichteten Transformatorkern 1 sind die Leerlaufverluste des nach dem erfindungsgemäßen Verfahren geschichteten Transformatorkerns 1 reduziert.In the 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 Φ 1 of 45 ° and an immediately adjacent core sheet 110 a Angle Φ 2 of the straight abutting edge 102 also 45 °. This is followed by a core plate 210 with an angle Φ 3 with a collision edge 210 at an angle of 90 ° or 0 °. In the example shown the FIG. 7 has the straight abutting edge 102 at an angle of Φ 3 = 90 °. This is followed, in turn, as an alternating sequence, by a core plate 310 and 410 with an angle of the straight abutment edge 302, 402 Φ 4 and Φ 5, each of 45 °. This is followed by a sixth (the first is 10 and not 110) core sheet 510 including at an angle of Φ s the straight abutment edge S02 between the first sheet segment 11 (not explicitly drawn) and the second sheet segment 12 (not explicitly drawn). This is followed by a core sheet 510 with an angle Φ 6 of 0 °. This in turn is followed by two core sheets 610, 710 with a respective angle Φ 7, 8 of the straight abutment edge 2 of 45 °. In contrast to the layering method known in the prior art, in which the respective core sheets 10, 110, 210, 410, 510, 610, 710 each have a core tip and are arranged slightly offset from one another, in the present example the sheets can be layered without protruding tips be compiled. By means of the present invention, there are no longer any core tips, and thus no cavities and intermediate spaces in which liquid collects and thus cause corrosion. Compared with an exclusively of rectangular sheet metal segments 11, 12, 13 layered transformer core 1, the no-load losses of the stratified by the novel process transformer core 1 are reduced.

Die Figur 8 zeigt einen Ausschnitt der linken oberen Ecke eines Transformatorkerns 1 als Verbindung zwischen dem oberen Joch und dem linken Schenkel. Im dargestellten Beispiel der Figur 8 wechseln sich Kernbleche 10, 210 mit einem Winkel Φ1, Φ3 von 60° der jeweils geraden Stoßkante 2, 202 im Vergleich zu Kernblechen 110, 310 mit einem Winkel Φ2, Φ4 der geraden Stoßkante 2, 102, 302 von 45° ab.
In der Figur 9 ist eine weitere Kombination von unterschiedlichen Winkeln der geraden Stoßkante 2 bezogen auf eine Längsrichtung eines der Blechsegmente 11 (nicht eingezeichnet) dargestellt. Wiederum ist die obere linke Ecke eines Transformatorkerns 1 als versetzte Schichtung gezeigt. Im dargestellten Beispiel der Figur 9 wechseln sich Kernbleche 10, 110, 210, 310, 410, 510 mit Winkel Φ1, Φ4 von 90° mit Kernblechen 10 und 310 ,von 0° mit Kernblechen 110, 410 mit Winkel Φ2, Φ5 von 0° mit Kernblechen 210, 510 mit einem Winkel Φ3, Φ6 der geraden Stoßkante 2 von 45° ab.
The 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. In the example shown the FIG. 8 alternating core plates 10, 210 with an angle Φ 1 , Φ 3 of 60 ° of the respective straight abutment edge 2, 202 compared to core plates 110, 310 with an angle Φ 2 , Φ 4 of the straight abutment edge 2, 102, 302 of 45 ° from.
In the 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. Again, the upper left corner of a transformer core 1 is shown as staggered lamination. In the example shown the FIG. 9 core laminations 10, 110, 210, 310, 410, 510 with angle Φ 1 , Φ 4 of 90 ° with core laminations 10 and 310, of 0 ° with core laminations 110, 410 with angle Φ 2 , Φ 5 of 0 ° with core laminations 210, 510 with an angle Φ 3, Φ 6 of the straight abutment edge 2 of 45 °.

Die gezeigten Beispiele in der Figur 7, Figur 8 und Figur 9 zeigen zur besseren Sichtbarkeit die Kernbleche 10, 110, 210, 310, 410, 510, 610 in einer versetzten Art und Weise. Ein nach dem erfindungsgemäßen Verfahren hergestellter Transformatorkern 1 kann daher entweder aufgrund der Längenverhältnisse der Kernbleche 10, 110, 210, 310, 410, 510, 610 ein Querschnitt angedeuteten runden Form aufweisen oder eine vollständig rechteckige Struktur des Transformatorkerns 1 definieren. Die Kanten des Transformatorkerns 1 werden daher nahezu plan, so dass eine Korrosionsanfälligkeit aufgrund von bestehenden Zwischenräumen gerade nicht mehr gegeben wäre.The examples shown in the 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.

Die Figur 10 zeigt einen Ausschnitt des Kernblechs 10 als Verbindung des oberen Joches mit dem mittleren Schenkel eines Dreiphasentransformatorkerns. Ein erstes Blechsegment 11 des Kernblechs 10 weist eine gerade Schnittkante auf, die formschlüssig mit einer korrespondierenden Schnittkante eines zweiten Kernblechs 12 eine erste gerade Stoßkante 2a des Kernblechs 10 aufweist. Die so zusammengefügten Bleche der Segmente 11, 12 definieren teilweise eine Schnittkante, die formschlüssig mit einer korrespondierenden Schnittkante eines weiteren Blechsegmentes 13 eine gerade Stoßkante in einem Winkel von 90° bezogen auf die Längsrichtung des ersten Blechsegmentes 11 definiert. Die so zusammengesetzten Blechsegmente 11, 12, 13 weisen daher die beiden Stoßkanten 2, 2a auf. Andere Winkel der geraden Stoßkanten 2, 2a sind gemäß der vorliegenden Erfindung ohne weiteres umsetzbar.The 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.

Es zeigt Figur 11 einen Ausschnitt eines erfindungsgemäßen Transformatorkerns 1, bei dem verschiedenste Kernbleche 10, 110, 210, 310 kombiniert sind. Der in der Figur 11 gezeigte Ausschnitt des Transformatorkerns 1 zeigt wiederum den kreuzförmigen Teil des oberen Joches in Verbindung mit dem mittleren Schenkel eines mehrphasigen Transformatorkerns 1. Hierbei wird in einer alternierenden Abfolge der Kernbleche 10, 110, 210, 310 eine erste Konzeption eines Kernbleches 10 aus einem durchgängigen ersten Blechsegment 11 (nicht eingezeichnet) als durchgehendes oberes Joch mit einem rechtwinklig hieran anschließenden mittleren Schenkel als zweites Kernblech 12 (auch nicht dargestellt) kombiniert. Das so konzipierte erste Kernblech 10 wird im Rahmen des erfindungsgemäßen Verfahrens neben einem zweiten Kernblech 110 geschichtet, wobei das zweite Kernblech 110 Blechsegmente 11, 12, 13 (nicht dargestellt) aufweist, die zwei Stoßkanten 2, 2a in einem Winkel Φ1 von 45° und Φ2 von 90° aufweisen. Das vierte Kernblech 310 ist spiegelverkehrt bezüglich der Konzeption mit dem zweiten Kernblech 110.It shows 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. Here, in an alternating sequence of the core sheets 10, 110, 210, 310, 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 Φ 1 of 45 ° and Φ 2 of 90 °. The fourth core sheet 310 is mirrored in design with the second core sheet 110.

In der Darstellung Figur 12 ist der obere Bereich eines Transformatorkerns 1 mit teilweise Mittelschenkel, linkem Au-βenschenkel und oberem Joch sichtbar. Dargestellt in der Figur 12 ist die Schichtung des Transformatorkerns 1 bezüglich der unterschiedlichen Kernbleche 10, 110, 210, 310, 410, 510. Im dargestellten Beispiel der Figur 12 weist das erste Kernblech 10 mindestens drei Blechsegmente 11, 12, 13 auf, wobei die Stoßkante 2, 2a des oberen Joches zwei Winkel von ±45° aufweist und die gerade Stoßkante 2a zwischen dem ersten und dem zweiten Blechsegment 11, 12, einen Winkel von 45° aufweist.In the presentation 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. In the example illustrated FIG. 12 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 °.

Im dargestellten Beispiel weist das nächste Kernblech 110 (nicht dargestellt) eine im Winkel von 45° verlaufende Schnittstoßkante 102 zwischen dem ersten Blechsegment 11 und dem dritten Blechsegment 13 der Verbindung zwischen dem oberen Joch und dem mittleren Schenkel auf. Des Weiteren ist der linke Schenkel als zweites Blechsegment 12 mit dem ersten Blechsegment 11 als oberes Joch über einen Winkel von 45° der Stoßkante 202 formschlüssig zusammengefügt. Die Stoßkante 202, 202a und 202b des dritten Kernblechs 210 (nicht eingezeichnet) verlaufen in einem Winkel von jeweils 90° bzw. 45°. In diesem Falle sind die Blechsegmente 11, 12 zwischen dem oberen Joch und dem linken Schenkel über eine 90°-Stoßkante 202a verbunden. Ein Teil des oberen Jochs ist als erstes Blechsegment 11 in einem Winkel von 90° mit dem dritten Blechsegment 13 als Teil des mittleren Schenkels ebenfalls in einem Winkel vom 90° formschlüssig zusammengesetzt. Das dritte Blechsegment 13 weist zusätzlich eine Schnittkante im Winkel von 45° auf, die formschlüssig mit einer korrespondierenden Schnittkante eines vierten Blechsegmentes (nicht eingezeichnet) formschlüssig eine dritte Stoßkante 202b bildet.In the example shown, 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. In this case, 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).

Die weiteren Stoßkanten im gezeigten Beispiel 302, 302a, 402, 402a, 502 und 502a der vierten bis sechsten Kernbleche 310, 410, 510 (nicht eingezeichnet) verlaufen in einem Winkel von jeweils 45°. Des Weiteren ist in der Darstellung der Figur 12 ein minimaler Versatz der gleich verlaufenden Stoßkanten 102, 302, 402, 502 und 102, 302a, 402a und 502a sichtbar, so dass das erfindungsgemäße Verfahren bei der Beschichtung von herkömmlichen Transformatoren zum Einsatz kommen kann und die störenden Einflüsse von entsprechenden Kernspitzen vermieden wird.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 (not shown) 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.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Transformatorkerntransformer core
2,2a2,2a
Stoßkante des ersten KernblechsAbutting edge of the first core sheet
1010
erstes Kernblechfirst core sheet
11,12,1311,12,13
Blechsegment eines KernblechsSheet metal segment of a core sheet
102,102a102,102a
Stoßkanten des zweiten KernblechsButt edges of the second core sheet
110110
zweites Kernblechsecond core sheet
202,202a,202b202,202a, 202b
Stoßkanten des dritten KernblechsButt edges of the third core sheet
210210
drittes Kernblechthird core sheet
302,302a302,302a
Stoßkanten des vierten KernblechsButt edges of the fourth core sheet
310310
viertes Kernblechfourth core sheet
402,402a402,402a
Stoßkanten des fünften KernblechsButt edges of the fifth core sheet
410410
fünftes Kernblechfifth core sheet
502,502a502,502a
Stoßkanten des sechsten KernblechsButt edges of the sixth core sheet
510510
sechstes Kernblechsixth core sheet
602,602a602,602a
Stoßkanten des siebten KernblechsButt edges of the seventh core sheet
610610
siebtes Kernblechseventh core sheet
702,702a702,702a
Stoßkanten des achten KernblechsButt edges of the eighth core sheet
710710
achtes KernblechEighth core sheet

Claims (3)

  1. Transformer core (1) consisting of layered core laminations (10, 110, 210, 310, 410, 510, 610),
    - the core laminations (10, 110, 210, 310, 410, 510, 610) consisting of at least two segmental laminations (11, 12, 13) and having a straight crosscut edge in the end region of the first segmental lamination (11) and positively forming a straight abutting edge (2, 102, 102a, 202, 202a, 202b, 302, 302a, 402, 402a, 502, 502a) with a corresponding straight crosscut edge of an end region of the second segmental lamination (12, 13), and the abutting edge (2, 102, 102a, 202, 202a, 202b, 302, 302a, 402, 402a, 502, 502a) having an angle Φ relative to the longitudinal direction of the end region of a segmental lamination (11, 12, 13),
    - a second core lamination (10, 110, 210, 310, 410, 510, 610) consisting of at least two segmental laminations (11, 12, 13) with straight crosscut edges corresponding at the end regions, and the assembled straight crosscut edges positively forming a straight abutting edge (102, 102a, 202, 202a, 202b, 302, 302a, 402, 402a, 502, 502a),
    - the abutting edge (102, 102a, 202, 202a, 202b, 302, 302a, 402, 402a, 502, 502a) of the second core lamination (10, 110, 210, 310, 410, 510, 610) having an angle Φ2 with reference to the longitudinal direction of the end region of one of the segmental laminations (11, 12, 13) of the second core lamination (10, 110, 210, 310, 410, 510, 610) which deviates from the angle Φ1 of the abutting edge (2) of a first core lamination (10, 110, 210, 310, 410, 510, 610),
    characterized
    - in that the first core lamination (10, 110, 210, 310, 410, 510, 610) with an angle Φ1 of the abutting edge (2) of approximately 0 degrees and the second core lamination (10, 110, 210, 310, 410, 510, 610) with the straight abutting edge (102, 102a, 202, 202a, 202b, 302, 302a, 402, 402a, 502, 502a) of the second core lamination (10, 110, 210, 310, 410, 510, 610) with an angle Φ2 of approximately 90 degrees and a third core lamination (10, 110, 210, 310, 410, 510, 610) with an angle Φ3 of the abutting edge (102a, 202a, 302a, 402a, 502a) of the third core lamination (10, 110, 210, 310, 410, 510, 610) of approximately 45 degrees are arranged in an alternating sequence.
  2. Transformer core according to Claim 1,
    characterized in that
    the first core lamination (10, 110, 210, 310, 410, 510, 610) consists of at least three segmental core laminations (11, 12, 13), a straight abutting edge (2) being positively formed at an angle Φ1 of 45 degrees between the first segmental core lamination (11, 12, 13) and the second segmental core lamination (11, 12, 13), and the assembled first and second segmental core lamination (11, 12, 13) having in a positively fitting manner a straight abutting edge (2a) with the third segmental core lamination (11, 12, 13) at an angle Φ2 of 0 degrees in the longitudinal direction of the end region of the third segmental core lamination (11, 12, 13).
  3. Transformer core (1) according to one of Claims 1 or 2,
    characterized in that
    the segmental laminations (11, 12, 13) consist of cold-rolled grain-oriented iron laminations.
EP08735299A 2008-04-10 2008-04-10 Transformer core Active EP2260494B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/003074 WO2009124574A1 (en) 2008-04-10 2008-04-10 Method for producing a transformer core and a transformer core

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EP2260494A1 EP2260494A1 (en) 2010-12-15
EP2260494B1 true EP2260494B1 (en) 2013-03-20

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US (1) US8212645B2 (en)
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BR (1) BRPI0822583B8 (en)
CA (1) CA2721012C (en)
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CA2721012C (en) 2017-03-07
EP2260494A1 (en) 2010-12-15
BRPI0822583B8 (en) 2023-04-25
WO2009124574A1 (en) 2009-10-15
US20110032069A1 (en) 2011-02-10
BRPI0822583A2 (en) 2021-04-13
CA2721012A1 (en) 2009-10-15
BRPI0822583B1 (en) 2021-09-28
US8212645B2 (en) 2012-07-03

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