EP1279177B1 - Gewickelter transformatorkern, verfahren und vorrichtung zur dessen herstellung - Google Patents

Gewickelter transformatorkern, verfahren und vorrichtung zur dessen herstellung Download PDF

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EP1279177B1
EP1279177B1 EP00921014A EP00921014A EP1279177B1 EP 1279177 B1 EP1279177 B1 EP 1279177B1 EP 00921014 A EP00921014 A EP 00921014A EP 00921014 A EP00921014 A EP 00921014A EP 1279177 B1 EP1279177 B1 EP 1279177B1
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Prior art keywords
strips
layers
core
magnetic
transformer
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French (fr)
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EP1279177A1 (de
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Eliezer Adar
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Att Advanced Transformer Technologies (1998) Ltd
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Att Advanced Transformer Technologies (1998) Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/25—Magnetic cores made from strips or ribbons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
    • H01F41/0226—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) from amorphous ribbons

Definitions

  • This invention relates to strip wound transformer cores and method of their manufacturing.
  • a transformer is a known electrical device widely used for transferring the energy of an alternating current in the primary winding to that in one or more secondary windings through electromagnetic induction. It typically contains two or more electrical circuits comprising primary and secondary windings, each made of a multi-turn coil of electrical conductors with one or more magnetic cores coupling the coils by transferring a magnetic flux therebetween.
  • Electrical transformer cores are typically formed of high grain oriented silicon steel laminations. The most common procedure for manufacturing such a transformer is to wind the core independently of a preformed coil or coils with which it will ultimately be linked. To this end, the core is formed with a joint at which the core laminations can be separated to open the core and thus accommodate insertion of the core into the coil window(s).
  • the wound core joints are typically of the so-called step-butt joint or step-lap joint types.
  • US Patent No. 1,164,288 discloses a technique of fabricating a cylindrical magnetic core for a power transformer.
  • the magnetic core is made from coiled strips, wherein the core is of greater axial dimension than the width of the strip.
  • To manufacture the core a plurality of layers of the magnetic steel strips is simultaneously coiled to form the cylindrical core. The sum of the width of the strips in each layer is equal to the axial dimension of the core, and at least one longitudinal edge of each strip is staggered is relation to those in adjacent turns of the resultant coil.
  • amorphous magnetic alloys for use as the core material for transformers because they are lower loss materials as compared to grain steel.
  • annealed amorphous metals become extremely brittle, and thus break under mechanical stress, for example, during the stage of closing the core joints.
  • Various techniques have been developed aimed at facilitating the manufacture of a wound transformer core (10) from amorphous strips, wherein the core has joints in a localized region thereof that allow the core to be opened to permit insertion into the window of preformed coil structure.
  • U.S. patent No. 4,413,406 discloses a method for forming cores for an electrical transformer, and also discloses the cores made from such a method.
  • an amorphous metal core has relatively thick superimposed laminations comprised of relatively thin amorphous metal sheets.
  • the amorphous metal sheets are heated and bonded together by a metallic bonding agent to form relatively thick amorphous metal packets for the superimposed laminations of the core.
  • the heating and bonding of the amorphous metal sheets reduce the mechanical stresses normally induced into the amorphous metal during the fabrication process.
  • a hybrid core has superimposed laminations certain of which comprise sheets of non-crystalline amorphous metal and one or more sheets of crystalline silicon steel metal.
  • WO 91/12960 discloses a laminated amorphous metal strip that has a first layer with at least two side-by-side strips of amorphous metal of unequal widths, and a second layer with at least two side-by-side strips of amorphous metal of unequal widths, the layers being in reverse order with respect to the widths of the strips such that the wider strips overlap and form a brickwork cross-section pattern.
  • a flexible polymeric bonding material is disposed between the layers.
  • a method for fabricating the laminated strip of amorphous metal includes providing rolls of metal, positioning the rolls in strips having differing widths, applying the bonding material, applying pressure while advancing the laminate, and cutting the laminate.
  • the main idea of the present invention consists in the use of a desired number of layers of magnetic strips to be simultaneously wound so as to form a substantially cylindrical, toroid-like transformer core of a desired height for carrying a coil block mounted thereon.
  • the construction is such that each layer is formed of a desired number of strips arranged along the longitudinal axis of the core, and the layers of a desired number are specifically arranged with respect to each other.
  • This construction is aimed at providing the optimal distribution of magnetic flux inside the strips in the layers.
  • the number of strips in the layer is dictated by the height of the transformer core and by the available widths of the magnetic strips.
  • the number of layers is dictated by the magnetic properties of the magnetic material of which the strips are made.
  • the thickness of the resultant winding it is dictated by the electrical and mechanical parameters of the transfonner, such as the height and cross section of the core, and frequency and rate power of the transformer.
  • a transformer core to be used in a power distribution transformer having a desired height and being of a substantially cylindrical toroidal shape, wherein:
  • the commercially available strips made of amorphous metals are characterized by a working value of magnetic induction, B w , about 1.35T, and the saturation value of magnetic induction, B sat , about 1.55T.
  • the number n of the layers should be such that a magnetic flux created in the first (uppermost) layer and flowing along the longitudinal axis of the layer, while reaching an air gap on its way and passing through all other layers in a transverse direction so as to return into the first layer, will not cause the saturation of the magnetic induction in other layers.
  • n the number of layers should satisfy the following relation: n ⁇ B w / (B sat -B w ), n being integer. Considering the above parameters of the commercially available amorphous strips, the minimal value of n is 7.
  • the predetermined distance defining the shift between each two adjacent layers is such that each of the air gaps in one layer is overlapped by (n-1) strips of the other layers of the structure.
  • the number of strips in the layer is defined by the desired height of the transformer core, namely, the sum of the width of the strips in the layer is substantially equal to the height of the core. It should be understood that, in order to planarize the top and bottom surfaces of the core, the number of strips in the extreme layers of the entire structure (1 st and 7 th layers) differs from that of the intermediate layers. The two opposite extreme strips in each of the intermediate layers are of a smaller width than that of the other strips in the layer.
  • each air gap of the intermediate layer in turn is overlapped by the (n-1) strips of other layers.
  • some of the overlapping strips are of the structure in the same turn and the others are of the structure of an adjacent turn.
  • the strip layers are wound simultaneously being fed from a corresponding number of bobbins (e.g., 7 bobbins). Namely, the bobbins are aligned in an array, each bobbin feeding a corresponding one of the seven strip layers. The strips are fed from the bobbin with the predetermined shift between the layers.
  • the bobbins may be prepared such that the strips layer wound on each of the bobbins is arranged with respect to the strip layer wound on the other bobbins in a manner corresponding to the arrangement of layers in the resultant core.
  • the bobbins may be identically wound with the strip layers, but mounted with the desired shift with respect to each other.
  • the present invention may be used for manufacturing a three-phase transformer.
  • a magnetic circuit of such transformer is composed of three transformer cores, each constructed as described above (for carrying three coil blocks, respectively) and two spaced-apart, parallel, plate-like elements attached to the top and bottom surfaces of the transformer cores, respectively.
  • the transformer cores with the coil blocks mounted thereon are enclosed between the upper and lower plates of the magnetic circuit.
  • the transformer cores are spaced at intervals of 120 degrees about a central vertical axis of the entire transformer structure.
  • the cores are spaced from each other and from the plate-like elements by insulating spacers. All the spacers may be formed of plastic with filler of a magnetic powder with the concentration of 20-50%.
  • the plates and the cores may be formed of amorphous strips.
  • the plate may be of a substantially triangular shape with rounded edges, or of a circular shape that simplifies the technological process of its manufacture.
  • the plate-like element may be a toroid manufactured similar to that of the transformer core, as described above.
  • the advantages of the above construction of a three-phase transformer consist of the following.
  • the provision of the plate-like elements of a triangular shape with rounded corners allows for effectively transferring the magnetic flux between the three column-like elementary circuits enclosed between the plates.
  • the provision of the column-like elementary circuits formed by one or more toroids produced by wounding the amorphous strips enables to obtain a desired height of the column irrespectively of the limited width of the strip.
  • the dimensions of the elements of the magnetic circuit i.e., the diameter of each transformer core and each of the plate-like elements
  • a transformer core 10 to be used in a power distribution transformer (not shown here).
  • the core is in the form of a cylindrically shaped toroid of a desired height L .
  • the toroid 10 is formed by coiling a multi-layer structure 12 of magnetic strips about a central axis 14 of a mandrel 16 (constituting a central axis of the toroid).
  • the multi-layer structure 12 is composed of a plurality of parallel layers - seven layers L 1 -L 7 in the present example, which are arranged along an axis perpendicular to the central axis 14 .
  • Several strips (ribbons) made for example of a soft ferromagnetic amorphous alloy form each of the layers: layer L 1 is formed by strips S 1 , layer L 2 is formed by strips S 2 , etc.
  • the strips in the layer are arranged in an array extending along the central axis 14 , with the unavoidable existence of an air gap, generally 18 , between each two adjacent strips.
  • the air gaps of each layer are shifted with respect to the air gaps of the adjacent layer, as will be described more specifically further below.
  • the resultant winding of the core 10 is composed of a plurality of turns of regularly repeated multi-layer structure 12 .
  • the number of turns i.e., the thickness of the resultant winding
  • the required power of the transformer is defined by the required power of the transformer.
  • each of the layers in the structure 12 is composed of several strips such that the sum of the widths of the strips (together with the gaps between the strips) is substantially equal to the height of the transformer core.
  • the structure 12 is composed of 7 layers.
  • the number n of layers is determined in accordance with the magnetic properties of the amorphous material, as follows: n ⁇ B w / (B sat -B w ), n being integer.
  • strips S 1 of layer L 1 are arranged with air gaps 18a, strips S 2 of layer L 2 - with gaps 18b, strips S 3 of layer L 3 - with gaps 18c, strips S 4 of layer L 4 - with gaps 18d, strips S 5 of layer L 5 - with gaps 18e, strips S 6 of layer L 6
  • the shift between the layers is appropriately selected. For example, considering the equal width of the intermediate strips of the layer (i.e., strips between two opposite extreme strips), the sum of shift distances of all the layers in the structure should not exceed the width of the intermediate strip.
  • Fig. 3 illustrates the main components of an apparatus 20 for manufacturing the transformer core 10.
  • the apparatus 20 comprises seven bobbins B 1 -B 7 (generally, n bobbins), each for carrying a corresponding strip layer to be fed to the mandrel 16 .
  • the layers are previously wound onto the bobbins in a manner, which will be described further below, and simultaneously fed onto the mandrel 16 , by a suitable driving assembly, which is not specifically shown.
  • the driving assembly may be of any known suitable kind, and may be associated with the mandrel 16 for driving the revolution thereof, while the bobbins are rotatably mounted on their shafts (not shown) to rotate against the tension of the feeding layers.
  • the driving assembly may also be associated with the shafts of bobbins for driving the revolution thereof.
  • the construction may be such that the bobbins are driven together for rotation about the mandrel, which, in this case, is mounted stationary.
  • a guiding assembly 22 comprising one or guiding rollers, generally at 24 , and a pair of width limiting rollers 26 accommodated at opposite ends of the mandrel 16 extending normally to the direction of movement of the layers onto the mandrel.
  • the layers are prepared on the bobbins with the corresponding shift between the strips of each two adjacent layers as described above.
  • the corresponding arrangements of strips of different layers are previously determined, and the strips are wound on the bobbins accordingly, or identically wound bobbins are prepared and then cut by any suitable cutting tool.
  • the layers of sufficient width could be wound on the mandrel, and the so produced core then cut at opposite ends.
  • the bobbing and/or guiding means may be appropriately shifted.
  • the transformer 30 comprises a magnetic circuit formed by an upper plate-like element 32a, a lower plate-like element 32b, and three parallel identical cores 10 (only two of them being shown in the drawing).
  • the magnetic circuit is arranged such that the plates 32a and 32b are parallel to each other, and the cores 10 serve as supports between the plates, thereby forming a cage-like structure spatially symmetrical about a central axis CA.
  • each of the plates 32a and 32b is a toroid, and is made of amorphous ribbons 34 wound about a central hole 35 to form the planar toroid.
  • each of the coil blocks 36 includes a primary winding 36a and a secondary winding 36b.
  • each phase of the transformer 30 is formed by the transformer core 10 with the corresponding coil block 36 mounted thereon.
  • the transformer 30 has a modular structure, namely, the plates 32a and 32b, and the cores 10 can be easily assembled together and disassembled. When one of the plates 32a or 32b is removed, the coil blocks 36 can be removed as well, thereby enabling, for example, to repair the coil.
  • each of the plates 32a and 32b has a generally triangular shape with rounded sides and corners.
  • the amorphous ribbon 34 is made of an alloy having soft ferromagnetic properties.
  • Each of the cores 10 is a toroid manufactured as described above. This construction enables to achieve a desired height of the core 10, notwithstanding the fact that the width of amorphous ribbon is typically limited.
  • the entire structure is held together with three de-mountable bands 38 (only two of them being seen in the figure), each having a screw (or spider) 40 to tighten the band.
  • Structural members 42 are provided, each located between the corresponding one of the bands 38 and each of the plates 32a and 32b.
  • a base 44 supports the entire structure.
  • An inner, upper surface of the plate 32b is brought into contact with lower surfaces of the cores 10 to transfer magnetic fluxes therebetween, as will be described more specifically further below.
  • the transformer 30 operates in the following manner. As an electric current passes through each primary winding 36a of the coil block 36, a magnetic flux is generated and propagates along the corresponding core 10 between the upper and lower plates 32a and 32b. Arrows 46, 48 and 50 show fluxes generated in the three cores 10, respectively. The magnetic flux flowing through the column 10 generates an induced voltage in the secondary winding 36b of the corresponding coil block 36.
  • the device having this structure thus functions as a three-phase transformer.
  • the electric current for example, with the working frequency of50Hz, is supplied from a power source (not shown) to a terminal of coil of the primary winding 36a, and, whilst passing through the coil turns, creates the basic magnetic flux 46.
  • the flux 46 is divided into two identical fluxes 52 and 54 in the plate 32a. These fluxes 52 and 54 flow along two identical portions of the toroidal plate 32a, and, then, flow down through the two other cores 10.
  • the flux 52 changes into flux 48
  • the flux 54 changes into the flux 50 passing down through the cores 10.
  • the fluxes 48 and 50 flow along two equal paths of the toroidal plate 32b.
  • the flux 48 changes into a flux 56
  • the flux 50 changes into a flux 58.
  • the fluxes 56 and 58 are transferred into the core 10 forming the sum flux 46, which flows up.
  • the magnetic flux loop is closed.
  • the fluxes of the other phases of the transformer flow in the similar way summing up the total magnetic flux.
  • the plates 32a and 32b could have a circular shape.
  • the flux streams 52, 54, 56 and 58 will flow along circular paths therein.
  • each of the plates 32a and 32b is shaped like an equilateral triangle with rounded sides and corners. This results in a shorter path for the flux streams in the plates between the cores 10, i.e., the shape of the flux streams is closer to a straight line. This enables to achieve a lower magnetic reluctance, or better conductance of the magnetic flux.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)

Claims (15)

  1. Ein Transformatorkern (10), der in einem Energieverteiler-Transformator verwendet werden soll, wobei der Transformatorkern (10) eine gewünschte Höhe (L) und eine im Wesentlichen zylindrische Ringform in Form einer Mehrschicht-Struktur (12) hat, die um eine Mittelachse (14) des Rings gewickelt ist, wobei jede Schicht in der Struktur (12) aus einer vorbestimmten Anzahl von Magnetstreifen (S) besteht, die entlang der Mittelachse (14) angeordnet sind, wobei natürlicherweise Luftspalte (18) zwischen jeden zwei benachbarten Streifen der Schicht vorhanden sind, wobei die vorbestimmte Anzahl der Streifen derart ist, dass die Summe der Breiten (1) der Streifen im Wesentlichen gleich mit der gewünschten Höhe (L) des Kerns (10) ist, wobei der Transformatorkern (10) dadurch gekennzeichnet ist, dass
    eine erforderliche Anzahl n von Schichten in der Struktur bestimmt wird durch die magnetischen Eigenschaften der Streifen, um einer Beziehung n≥B w / (B sat - B w ) zu entsprechen, worin B w ein Arbeitswert einer magnetischen Induktion ist und B sat ein Sättigungswert der magnetischen Induktion ist, und
    die Schichten im Verhältnis zueinander über einen vorbestimmten Abstand in eine Richtung entlang der Mittelachse verschoben sind, sodass jeder der Luftspalte in einer Schicht durch (n-1) Streifen der anderen Schichten der Struktur überlagert ist.
  2. Der Transformatorkern (10) gemäß Anspruch 1, worin die Magnetstreifen (S) aus amorphen Metallen hergestellt sind.
  3. Der Transformatorkern (10) gemäß Anspruch 2, worin der Arbeitswert der magnetischen Induktion und der Sättigungswert der magnetischen Induktion des amorphen Streifens ungefähr 1,35T beziehungsweise 1,55T beträgt, wobei die Anzahl der Schichten nicht weniger als 7 beträgt.
  4. Ein Verfahren zur Herstellung eines Transformatorkerns (10), der in einem Energieverteiler-Transformator verwendet werden soll, worin der Transformatorkern (10) eine gewünschte Höhe (L) hat und aus einer Mehrschicht-Struktur (12) von Magnetstreifen (S) gebildet ist, die gewickelt sind, um eine resultierende im Wesentlichen zylindrische ringförmige Wicklung des Kerns zu erzeugen, wobei die Mehrschicht-Struktur (12) eine vorbestimmte Anzahl (n) von Schichten einschließt, von denen jede eine vorbestimmte Anzahl der Magnetstreifen (S) einschließt, wobei das Verfahren dadurch gekennzeichnet ist, dass
    (a) die Anzahl n der Schichten in der Struktur (12) in Übereinstimmung mit magnetischen Eigenschaften der Streifen angegeben wird, um einer Beziehung n ≥ B w / (B sat - B w ) zu entsprechen, worin B w ein Arbeitswert einer magnetischen Induktion ist und B sat ein Sättigungswert der magnetischen Induktion ist;
    (b) jede der Schichten aus der vorbestimmten Anzahl der parallelen Magnetstreifen (S) hergestellt ist, wobei natürlicherweise Luftspalte (18) zwischen jeden zwei benachbarten Streifen in der Schicht vorhanden sind;
    (c) die Mehrschicht-Struktur (12) um eine Mittelachse (14) eines Dorns (16) gewickelt ist, welcher den Kern während der Herstellung hält, durch gleichzeitiges Einführen der n Schichten auf eine Art und Weise, dass die Schichten des Kerns zueinander um einen vorbestimmten Abstand entlang der Mittelachse verschoben sind, sodass jeder der Luftspalte in einer Schicht durch (n-1) Streifen der anderen Schichten der Struktur überlagert wird.
  5. Das Verfahren gemäß Anspruch 4, worin die Herstellung jeder der Schichten das Wickeln der Streifen auf eine Spule (B) umfasst, sodass eine Summe von Breiten (1) der Steifen im Wesentlichen gleich der gewünschten Höhe (L) des Kerns (10) ist, wobei die Spulen in einem beabstandeten parallelen Verhältnis ausgerichtet sind, sodass die Schichten auf den Spulen im Verhältnis zueinander um den vorbestimmten Abstand entlang der Achse der Spule verschoben sind.
  6. Das Verfahren gemäß Anspruch 4, worin Kanten mindestens einiger der gewickelten Schichten so geschnitten sind, dass äußere Streifen auf den Spulen verschiedene Breiten haben im Vergleich zu derjenigen von identischen intermediären Streifen auf den Spulen.
  7. Das Verfahren gemäß Anspruch 4, worin die Herstellung der Schichten das Wickeln identischer Schichten der Streifen auf Spulen und das Anordnen der Spulen auf eine solche Art und Weise umfasst, dass für die Verschiebung der Schichten im Verhältnis zueinander gesorgt wird.
  8. Das Verfahren gemäß Anspruch 7, das auch den Schritt des Schneidens gegenüberliegender Enden des resultierenden Kerns zum Abflachen seiner oberen und unteren Oberflächen umfasst.
  9. Eine Vorrichtung (20) zur Herstellung eines Transformatorkerns (10), der in einem Energieverteiler-Transformator verwendet werden soll, worin der Transformatorkern (10) eine gewünschte Höhe (L) hat und aus einer Mehrschicht-Struktur (12) von Magnetstreifen (S) gebildet ist, die so gewickelt sind, dass sie eine im Wesentlichen zylindrische ringförmige Wicklung des Kerns erzeugen, wobei die Vorrichtung dadurch gekennzeichnet ist, dass sie Folgendes umfasst:
    i) eine erforderliche Anzahl von Spulen (B), von denen jede eine vorbestimmte Anzahl der Magnetstreifen (S) für eine entsprechende der Schichten trägt, wobei die Streifen auf die Spule gewickelt und entlang einer Achse davon angeordnet sind, wobei natürlicherweise kleine Luftspalte (18) zwischen jeden zwei benachbarten Streifen vorhanden sind, worin die erforderliche Anzahl (n) der Schichten durch magnetische Eigenschaften der Streifen bestimmt wird, um einer Beziehung n ≥B w / (B sat - B w ) zu entsprechen, worin B w ein Arbeitswert einer magnetischen Induktion ist und B sat ein Sättigungswert der magnetischen Induktion ist;
    ii) eine Antriebseinheit zum Antreiben der gleichzeitigen Bewegung der Streifenschichten von den Spulen auf einen Dorn, welcher den Transformatorkern (10) hält; und
    iii) eine Führungseinheit (22) zum Führen der Wicklung der eingeführten Schichten um eine Mittelachse (14) des Dorns (16) mit einer erforderlichen Dichte zwischen den Schichten,
    worin die Schichten des Kerns (10) im Verhältnis zueinander um einen vorbestimmten Abstand entlang der Mittelachse des Dorns verschoben sind, sodass jeder der Luftspalte in einer Schicht durch (n-1) Streifen der anderen Schichten überlagert wird.
  10. Die Vorrichtung gemäß Anspruch 9, worin die Spulen in einem beabstandeten parallelen Verhältnis entlang einer Achse ausgerichtet sind, die rechtwinklig zur Achse der Spule ist, und die Schichten auf den Spulen um den vorbestimmten Abstand entlang der Achse der Spule zueinander verschoben sind.
  11. Die Vorrichtung gemäß Anspruch 9, worin die Streifen verschiedener Schichten auf ähnliche Art und Weise auf entsprechenden Spulen angeordnet sind und die Spulen in einem beabstandeten parallelen Verhältnis entlang einer Achse ausgerichtet sind, die rechtwinklig zur Achse der Spule ist, wobei sie um den vorbestimmten Abstand entlang einer Achse parallel zur Achse der Spule im Verhältnis zueinander verschoben sind.
  12. Die Vorrichtung gemäß Anspruch 9, worin die Antriebseinheit mit einer Welle des Dorns verbunden ist, um seine Rotation anzutreiben.
  13. Die Vorrichtung gemäß Anspruch 9, worin die Antriebseinheit mit den Spulen verknüpft ist, um für die Rotation davon um die Achse des Dorns zu sorgen.
  14. Die Vorrichtung gemäß Anspruch 9, worin die Führungseinheit (22) Breitenbegrenzungsrollen (26) umfasst, die an gegenüberliegenden Enden des Dorns (16) angebracht sind.
  15. Ein Drehstromtransformator (30), der einen Magnetkreis (32a, 32b, 10) und drei Spulenblöcke (36) umfasst, worin der Magnetkreis zwei beabstandete, parallele, plattenähnliche Elemente (32a, 32b) umfasst; und drei beabstandete parallele Transformatorkerne (10), von denen jeder gemäß einem beliebigen der Ansprüche 1 bis 3 konstruiert ist und den entsprechenden der drei Spulenblöcke (36) trägt und für die jeweilige der drei Phasen dient, worin die Säulen (10) im Wesentlichen rechtwinklig zu den plattenähnlichen Elementen (32a, 32b) sind und so dazwischen eingeschlossen sind, dass sie eine räumliche symmetrische Struktur um eine Mittelachse (CA) des Transformators (30) herum bilden.
EP00921014A 2000-04-27 2000-04-27 Gewickelter transformatorkern, verfahren und vorrichtung zur dessen herstellung Expired - Lifetime EP1279177B1 (de)

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PCT/IL2000/000243 WO2001082316A1 (en) 2000-04-27 2000-04-27 A wound transformer core and a method and apparatus for manufacturing thereof

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EP1279177B1 true EP1279177B1 (de) 2006-07-26

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EP (1) EP1279177B1 (de)
AT (1) ATE334473T1 (de)
AU (1) AU2000241411A1 (de)
DE (1) DE60029640T2 (de)
ES (1) ES2269128T3 (de)
RU (1) RU2241271C2 (de)
WO (1) WO2001082316A1 (de)

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AU2000241411A1 (en) 2001-11-07
ATE334473T1 (de) 2006-08-15
RU2241271C2 (ru) 2004-11-27
RU2002131940A (ru) 2004-03-10
DE60029640T2 (de) 2007-07-26
ES2269128T3 (es) 2007-04-01
DE60029640D1 (de) 2006-09-07
WO2001082316A1 (en) 2001-11-01
EP1279177A1 (de) 2003-01-29

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