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EP2206126A1 - Transformer core having a stray field shield - Google Patents

Transformer core having a stray field shield

Info

Publication number
EP2206126A1
EP2206126A1 EP07821945A EP07821945A EP2206126A1 EP 2206126 A1 EP2206126 A1 EP 2206126A1 EP 07821945 A EP07821945 A EP 07821945A EP 07821945 A EP07821945 A EP 07821945A EP 2206126 A1 EP2206126 A1 EP 2206126A1
Authority
EP
European Patent Office
Prior art keywords
core
laminated
stray field
transformer core
laminated core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07821945A
Other languages
German (de)
French (fr)
Other versions
EP2206126B1 (en
Inventor
Peter Hamberger
Martin Mairinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens Transformers Austria GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Transformers Austria GmbH and Co KG filed Critical Siemens Transformers Austria GmbH and Co KG
Publication of EP2206126A1 publication Critical patent/EP2206126A1/en
Application granted granted Critical
Publication of EP2206126B1 publication Critical patent/EP2206126B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together

Definitions

  • the invention relates to a transformer core with a stray shield having at least one winding assembly bearing core core formed from a laminated core, wherein the laminated core is closed by Endlamellen, each Endlamelle is associated with a stray field screen having laminated laminations whose layer planes perpendicular to the layer planes of Laminations of the core leg are arranged.
  • machine parts such as e.g. the rotor of an electric motor, the core leg of a transformer or a choke laminated ge run.
  • eddy current losses induced by the temporal change of a magnetic flux can be kept low.
  • stray flux which also causes eddy current losses in the core, although this is always much smaller than the main flow, which is performed in the machine parts.
  • a magnetic shield In order to reduce the magnetic power loss of a transformer or a choke, a magnetic shield is already known from DE 1 237 677, which shields the stray flux from the core of a transformer or a throttle.
  • This magnetic shield consists of laminations, which are layered into a laminated core. The sizing levels of the magnetic shield laminations are perpendicular to the finishing planes of the core leg laminations.
  • Magnetic shield is firmly clamped by means of clamping wedges or clamping strips between the core leg and the surrounding winding with the interposition of a solid support plate holding magnetic shield laminations.
  • the magnetic shield and the mounting take up an installation space in the winding window, so that the electrical winding, which encloses the core leg, must be dimensioned larger.
  • the invention is based on the object to provide a transformer core, in which the formation of eddy currents, which are caused by leakage flux, is kept as low as possible in the simplest possible way.
  • the invention is based on the basic idea of forming a core made of a laminated core transformer core, the outer core stage as a stray field shield, so that the
  • the stray field patch screen is arranged such that the layer planes are perpendicular to the layer planes of the core leg Belchperss and that the lamination end faces of the stray field shield directly on an outer broad surface of an associated Endlamelle.
  • the stray field shield can be fixed in different ways, for example by frictional engagement or by material closure.
  • the outer stage of the core fulfills a dual function: on the one hand it absorbs the leakage flux entering from the air space, on the other hand it also carries a part of the main flow. Since the leakage flux enters the front side of the screen device, the formation of eddy currents is severely limited by the correspondingly thin sheets. The magnetic losses decrease. The training so-called "hot spots" is lower. In an oil transformer, the oil heats less, which improves the technical reliability.
  • the arrangement of the stray field shield according to the invention allows a compact structure, since the lamination end surfaces of the stray field shield directly to a
  • the determination of the stray field-laminated core can also be done by a metal adhesive bond with advantage.
  • a metal adhesive bond with advantage.
  • a very special advantage can be achieved by the laminated core of the stray field screen is made of the same soft magnetic material as the laminated core of the core leg. As a result, residual material that accumulates in the production of a transformer type can be profitably used for the production of the stray field screen. This further reduces the laminated core of the stray field screen.
  • the laminated core of the core leg is made of partial laminated cores in such a way that seen in cross section the peripheral contour has steps in a first region of the laminated core (FIG. 3), while in another region it is a circular arc which concentrically surrounds it Core thigh axis runs.
  • the volume of the cylinder portion is used efficiently for the shielding of the leakage flux.
  • the stray field does not require any additional construction volume and consequently there is no additional requirement for conductor material for the production of the electrical winding.
  • a further amount for cost reduction can be achieved by the adhesive is applied only part of the area on the wide surfaces of the laminations of the litter field.
  • the laminations facing the leg axis lamination end face are arranged flush in a plane. It has proven useful if the joining surfaces of the metal adhesive bond are pretreated by mechanical or by chemical surface treatment methods.
  • a particularly high strength of the metal adhesive bond can be achieved if the lamination end faces have a low mechanical roughness, e.g. are ground.
  • Figure 1 shows a transformer according to the invention in a three-dimensional sketch with a shroud packet along the core leg;
  • FIG. 2 is a cross-sectional view of a first embodiment of the core leg of Figure 1;
  • FIG. 3 is a cross-sectional view of a second embodiment with a core leg assembled in stages from partial laminated cores
  • Figure 1 shows a simplified representation of a known Drekelkeltransformator whose core 1 is laminated.
  • Core 1 consists essentially of the three core legs 2 ', 2' ', 2' '', the lower yoke 5 and the upper yoke 6.
  • Each of the legs 2 ', 2' ', 2' '' carries a winding assembly 13, which is indicated in Figure 1 by a broken line drawing.
  • each of the legs 2 ', 2' ', 2' '' is composed of one (core leg) laminated core 3 and of two additional laminated cores 4 'and 4' '.
  • the laminated cores 4 ', 4' ' act as stray field screen.
  • the laminated core 3 is terminated by end blades 7 ', 7 ".
  • the front plate core 4 'lying in Figure 1 is applied to a front end plate 7' of the laminated core 3; the backward one
  • Sheet metal package 4 '' is applied to a rear end plate 1 '' of the laminated core 3.
  • the laminated core 3 is dimensioned to guide the main flow of the transformer.
  • the two additional laminated cores 4 'and 4'' form a stray field shield, ie they serve to shield the magnetic flux leakage: They conduct the leakage flux entering from the air space in the region of the leg 2', 2 '', 2 ''', so that this is not flat in one Endlamelle 7 'and 7''(see Figure 2) enter and there may cause eddy currents as a result of induction.
  • FIG. 2 shows a cross-sectional view of the
  • connection 16 is effected by a metal adhesive bond, ie by StoffSchluss, i. by atomic or molecular forces.
  • connection 16 can also be designed differently, for example as a (spot) welding or soldering connection, but it can also be produced by a pressure device, not shown in the drawing, by frictional engagement.
  • the laminations 40 ', 40' 'of the stray field shield 4' and 4 '' are also held together by an adhesive.
  • Suitable adhesives are in particular one-component products based on cyanoacrylate acid esters, which Cure humidity. Particularly suitable is an adhesive viscosity of a few hundred mPas, in particular 500-700 mPas, measured at 25 degrees Celsius. These adhesives can be easily applied by automated manufacturing tools in the manufacture of the transformer core. In practice, a pretreatment of the joining surfaces has proven to be particularly advantageous. A mechanical pretreatment, in particular a grinding of the lamination end faces 9 ', 9 "(FIG. 2) of the laminated core 4', 4", considerably increases the strength of the adhesive bond. It is also favorable if the wide surface 8 ', 8' (FIG. 2) of an end plate 7 ', 1 "is treated, for example, by chemical surface treatment methods. This can be done, for example, by anodizing this contact surface 8 ', 8 "and / or the lamination end faces 9', 9".
  • an end plate 7 'or 1 in each case closes the laminated core 3 at the top or bottom.
  • the layer planes 14 of this laminated core body 3 extend in a straightforward manner in FIG. 2 and are substantially perpendicular to the layer planes 15 of the front laminated core 4 or of the rear laminated core 4 ''.
  • the two laminated cores 4 'and 4' ' act with respect to the on the entrance surface of the end plate 7' and 1 '' stray flux as a "magnetic shield": they take the
  • FIG. 2 shows an example of a single field line 11 of the leakage flux.
  • the "magnetic shield” is located directly on the laminated core 3 and forms an integral part of the core leg.
  • the core sheets are made from a sheet metal strip of a high-permeability soft magnetic material. A typical sheet thickness is between 0.23 mm and 0.35 mm
  • the cutting of the individual sheets is done by punching or cutting. It remains obese in the metal sheet always residual material. This remainder material can be favorably used for the production of the stray shield (i.e., for the manufacture of laminations 4 ', 4' ') by first winding up the web-like stock material, then pressing it and finally cutting it to shape in the stack.
  • the lamella thickness D3 of the laminated core 3 is the same size with the lamella thickness D4 of the stray field shield 4 ', 4' '.
  • the laminated core 3 and the stray field shield 4 ', 4' ' are made of the same soft magnetic material.
  • Kernschenkels is circular.
  • the laminated core 3 is here composed of partial laminated cores 3 ', 3'',3'', etc., and combined with the shroud packages 4 'and 4''to a leg-laminated core.
  • the peripheral contour of the laminated core 3 extends in the region of the partial laminated cores 3 ', 3'',3''' in stages (see steps 18 in the area 17).
  • the stratification levels in the laminated core 3 and the stray field screen 4' regarding. 4 '' are also perpendicular to each other in Figure 3.
  • Each laminated core 4 'and 4''according to the invention is in each case with the end faces 9' and 9 '' of the fins 40'êt. 40 '' on an outer wide surface 8 'and 8''to.
  • the leakage flux 11 entering from the air space is largely absorbed by the "magnetic shield" 4 ', 4 "and to be guided by it in the axial direction 12 of a core leg 2', 2", 2 '''without appreciable Eddy currents and thus a corresponding heating in the laminated core 3 is caused.
  • the advantage of the construction according to the invention is in particular that the stray field shield 4 'or 4' 'is an integral part of the core of the transformer 1.
  • the adhesive connection eliminates the known in the prior art, usually solid
  • the stray field shield 4 ', 4''at the junction to the lower yoke 4 and the upper yoke 5 connects seamlessly.
  • the stray field screen 4 ', 4'' also performs a part of the main flow, that is, it performs a dual function, namely the leadership of the main flow and the shielding of the leakage flux.
  • a further advantage of the present invention is the fact that the emission of operating noise due to the elastic material closure of the adhesive bonds is lower.
  • FIG. 3 shows a further advantage of the illustrated exemplary embodiment: if the extent of the individual lamellae 40 'seen in the radial direction,
  • the predetermined by the cylinder portion 10 volume in the winding window can be used very efficiently for guiding the magnetic flux.
  • the width of the individual laminations 40 'and 40' 'of a stray field shield laminated core 4' or 4 '' but also be the same size or be stepped (not shown in Figure 3).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The invention relates to a transformer core having a stray field shield, comprising at least one core leg (2', 2'', 2''') carrying a winding arrangement (13) and formed from a laminate stack (3), said laminate stack (3) being sealed by end plates (7', 7''), each end plate (7', 7'') being associated with a stray field shield (4', 4'') that comprises coated laminate plates (40', 40''), the layer planes (15) of which are disposed perpendicular to the layer planes (14) of the laminate stack (3), characterized in that the laminate plates (40', 40'') are disposed with laminate plate faces (9', 9'') pointing toward the laminate stack (3) to abut an exterior width surface (8', 8'') of an associated end plate (7', 7'').

Description

Beschreibungdescription
Transformatorkern mit StreufeldschirmungTransformer core with stray shield
Technisches GebietTechnical area
Die Erfindung betrifft einen Transformatorkern mit einer Streufeldschirmung, der zumindest einen eine Wicklungsanordnung tragenden aus einem Blechpaket gebildeten Kernschenkel aufweist, wobei das Blechpaket durch Endlamellen abgeschlossen ist, wobei jeder Endlamelle ein Streufeldschirm zugeordnet ist, welcher geschichtete Blechlamellen aufweist, deren Schichtebenen senkrecht zu den Schichtebenen des Blechpakets des Kernschenkels angeordnet sind.The invention relates to a transformer core with a stray shield having at least one winding assembly bearing core core formed from a laminated core, wherein the laminated core is closed by Endlamellen, each Endlamelle is associated with a stray field screen having laminated laminations whose layer planes perpendicular to the layer planes of Laminations of the core leg are arranged.
Stand der TechnikState of the art
Bei elektrischen Maschinen werden Maschinenteile, wie z.B. der Rotor eines Elektromotors, der Kernschenkel eines Transformators oder einer Drossel, geblecht ausgeführt. Dadurch können Wirbelstromverluste, die durch die zeitliche Änderung eines magnetischen Flusses induziert werden, gering gehalten werden. Bei einer elektrischen Maschine tritt aber auch ein sogenannter Streufluss auf, der ebenfalls im Kern Wirbelstromverluste verursacht, obwohl dieser stets viel kleiner ist als der Hauptfluss, der in den Maschinenteilen geführt ist.In electrical machines, machine parts, such as e.g. the rotor of an electric motor, the core leg of a transformer or a choke laminated ge run. As a result, eddy current losses induced by the temporal change of a magnetic flux can be kept low. In an electric machine but also occurs a so-called stray flux, which also causes eddy current losses in the core, although this is always much smaller than the main flow, which is performed in the machine parts.
Es ist ferner bekannt, dass insbesondere jene Feldlinien des Streuflusses, die in eine Breitfläche einer Endlamelle eines Kernschenkel-Blechpaketes eindringen, dort durch Induktion magnetische Verluste verursachen, die eine ungewünschte lokale Erwärmung (in der Literatur auch als "hot spots" bezeichnet) des Kernwerkstoffes hervorrufen können. Bei einem Öltransformator kann dadurch das Öl auf eine unzulässig hohe Temperatur erhitzt werden, was die technische Zuverlässigkeit des Transformators beeinträchtigen kann.It is also known that in particular those field lines of the stray flux which penetrate into a wide surface of an end plate of a core leg laminated core, there by induction cause magnetic losses, which can cause unwanted local heating (referred to in the literature as "hot spots") of the core material. In the case of an oil transformer, this can heat the oil to an excessively high temperature, which can impair the technical reliability of the transformer.
Um die magnetische Verlustleistung eines Transformators oder einer Drossel zu verringern, ist schon aus der DE 1 237 677 ein Magnetschild bekannt, welches den Streufluss vom Kern eines Trafos bzw. einer Drossel abschirmt. Dieses Magnetschild besteht aus Blechlamellen, die zu einem Blechpaket geschichtet sind. Die Schlichtungsebenen der Magnetschild-Blechlamellen verlaufen senkrecht zu den Schlichtungsebenen der Kernschenkel-Blechlamellen. DasIn order to reduce the magnetic power loss of a transformer or a choke, a magnetic shield is already known from DE 1 237 677, which shields the stray flux from the core of a transformer or a throttle. This magnetic shield consists of laminations, which are layered into a laminated core. The sizing levels of the magnetic shield laminations are perpendicular to the finishing planes of the core leg laminations. The
Magnetschild ist unter Zwischenlage einer, die Magnetschild- Blechlamellen halternden massiven Trägerplatte mittels Spannkeilen bzw. Spannleisten zwischen dem Kernschenkel und der umschließenden Wicklung fest verspannt. Das Magnetschild und die Befestigung beanspruchen im Wicklungsfenster einen Einbauraum, sodass die elektrische Wicklung, die den Kernschenkel umschließt, größer dimensioniert werden muss.Magnetic shield is firmly clamped by means of clamping wedges or clamping strips between the core leg and the surrounding winding with the interposition of a solid support plate holding magnetic shield laminations. The magnetic shield and the mounting take up an installation space in the winding window, so that the electrical winding, which encloses the core leg, must be dimensioned larger.
Aus der DE 10 2005 008 302 Al ist ein Transformatorkern mit einer magnetischen Abschirmung in geschichtetem Aufbau bekannt. Auch hier ist zwischen der Abschirmung und dem Trafokern eine Spannvorrichtung angeordnet, was eine größere Wicklung erfordert. Die Spannvorrichtung ist wegen der Ausbildung von Wirbelströme segmentiert oder geschlitzt ausgeführt. Beide Ausführungen erfordern einen zusätzlichen Aufwand in der Fertigung. Darstellungen der ErfindungFrom DE 10 2005 008 302 Al a transformer core with a magnetic shield in a layered structure is known. Again, a tensioning device is arranged between the shield and the transformer core, which requires a larger winding. The tensioning device is designed segmented or slotted because of the formation of eddy currents. Both versions require additional effort in the production. Illustrations of the invention
Der Erfindung liegt die Aufgabe zu Grunde, einen Transformatorkern anzugeben, bei dem die Ausbildung von Wirbelströmen, die durch einen Streufluss verursacht werden, auf möglichst einfache Weise gering gehalten ist.The invention is based on the object to provide a transformer core, in which the formation of eddy currents, which are caused by leakage flux, is kept as low as possible in the simplest possible way.
Diese Aufgabe wird durch einen Transformatorkern mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen definiert.This object is achieved by a transformer core having the features of patent claim 1. Advantageous embodiments of the invention are defined in the dependent claims.
Der Erfindung liegt der Grundgedanke zu Grunde, bei einem aus einem Blechpaket gebildeten Transformatorkern, die äußere Kernstufe als Streufeldschirm auszubilden, so dass derThe invention is based on the basic idea of forming a core made of a laminated core transformer core, the outer core stage as a stray field shield, so that the
Streufluss daran gehindert ist, flächig in eine Blechlamelle des Kernschenkels einzutreten. Der Streufeldfeldschirm ist so angeordnet, dass die Schichtungsebenen senkrecht zu den Schichtungsebenen des Kernschenkel-Belchpakets verlaufen und dass die Blechlamellen-Stirnflächen des Streufeldschirms an einer äußeren Breitfläche einer zugeordneten Endlamelle direkt aufliegen. In dieser Einbaulage kann der Streufeldschirm auf unterschiedliche Weise fixiert sein, beispielsweise durch Reibschluss oder durch StoffSchluss .Stray flux is prevented from entering flat in a lamination of the core leg. The stray field patch screen is arranged such that the layer planes are perpendicular to the layer planes of the core leg Belchpakets and that the lamination end faces of the stray field shield directly on an outer broad surface of an associated Endlamelle. In this installation position, the stray field shield can be fixed in different ways, for example by frictional engagement or by material closure.
Gemäß der Erfindung erfüllt die äußere Stufe des Kerns eine Doppelfunktion: Sie nimmt einerseits den vom Luftraum eintretenden Streufluss auf, andererseits führt sie auch einen Teil des Hauptflusses. Da der Streufluss stirnseitig in die Schirmvorrichtung eintritt, ist die Ausbildung von Wirbelströmen durch die entsprechend dünn ausgebildeten Bleche stark eingeschränkt. Die magnetischen Verluste verringern sich. Die Ausbildung sog. "Heißpunkte", ist geringer. Bei einem Öltransformator erwärmt sich das Öl weniger stark, was die technische Zuverlässigkeit verbessert. Die erfindungsgemäße Anordnung des Streufeldschirms ermöglicht einen kompakten Aufbau, da die Blechlamellen- Stirnflächen des Streufeldschirms unmittelbar an einerAccording to the invention, the outer stage of the core fulfills a dual function: on the one hand it absorbs the leakage flux entering from the air space, on the other hand it also carries a part of the main flow. Since the leakage flux enters the front side of the screen device, the formation of eddy currents is severely limited by the correspondingly thin sheets. The magnetic losses decrease. The training so-called "hot spots" is lower. In an oil transformer, the oil heats less, which improves the technical reliability. The arrangement of the stray field shield according to the invention allows a compact structure, since the lamination end surfaces of the stray field shield directly to a
Endlamelle des Kernschenkels anliegen. Im Wicklungsfenster entsteht für den Schirm kaum zusätzlicher Raumbedarf, so dass das Kupfervolumen der elektrischen Wicklung, die den Kernschenkel umschließt, und damit die Herstellungskosten gering gehalten werden können.Abut the end blade of the core leg. In the winding window, little additional space is required for the screen, so that the copper volume of the electrical winding, which encloses the core leg, and thus the production costs can be kept low.
Hinsichtlich der Fertigung kann es besonders günstig sein, wenn die einzelnen Blechlamellen des Streufeldschirms durch einen Klebstoff zusammen gehalten werden. Hierfür wird bei der Fertigung zwischen benachbart liegenden Lammellen desWith regard to the production, it may be particularly advantageous if the individual laminations of the stray field shield are held together by an adhesive. For this purpose, in the production between adjacent lying Lammellen of
Streufeldschirms ein Klebstoff eingebracht. Das Auftragen des Klebstoffs kann automatisch mit an sich bekannten Dosiervorrichtungen erfolgen, was bei der Fertigung vorteilhaft ist.Streufeldschirms an adhesive introduced. The application of the adhesive can be done automatically with known metering devices, which is advantageous in manufacturing.
Die Festlegung des Streufeldschirm-Blechpaketes kann mit Vorteil ebenfalls durch eine Metall-Klebeverbindung erfolgen. Hierfür wird bei der Fertigung ein Klebstoff auf den Blechlammellen-Stirnflächen des Streufeldschirm-Blechpaktes bzw. auf der äußeren Breitfläche einer zugeordnetenThe determination of the stray field-laminated core can also be done by a metal adhesive bond with advantage. For this purpose, in the manufacture of an adhesive on the sheet metal plate end faces of the stray field-Blechpaktes or on the outer broad surface of an associated
Endlammelle des Kernschenkels aufgetragen. Durch die Metall- Klebeverbindung entfallen sonst übliche, meist massiv ausgebildete Befestigungsvorrichtungen, wie beispielsweise Spannkeile oder Spannleisten.Endlammelle the core leg applied. By the metal adhesive connection omitted otherwise usual, usually solidly formed fastening devices, such as clamping wedges or clamping bars.
Es empfiehlt sich die Lamellendicke des Kernschenkel- Blechpaketes und die Lamellendicke des Streufeldschirms gleich groß zu wählen. Dadurch ist die Lagerhaltung bei der Produktion einfacher.It is recommended that the lamella thickness of Kernschenkel- laminated core and the lamella thickness of the stray field shield to choose the same size. This makes storage easier during production.
Ein ganz besonderer Vorteil lässt sich dadurch erreichen, indem das Blechpaket des Streufeldschirms aus dem gleichen weichmagnetischen Werkstoff wie das Blechpaket des Kernschenkels hergestellt ist. Dadurch kann Restmaterial, das bei der Herstellung eines Transformatortyps anfällt gewinnbringend für die Fertigung des Streufeldschirms verwendet werden. Dadurch verringern sich weiter dieA very special advantage can be achieved by the laminated core of the stray field screen is made of the same soft magnetic material as the laminated core of the core leg. As a result, residual material that accumulates in the production of a transformer type can be profitably used for the production of the stray field screen. This further reduces the
Herstellungskosten. Zudem fällt weniger Produktionsabfall an.Production costs. In addition, less production waste is generated.
Es kann günstig sein, wenn das Blechpaket des Kernschenkels aus Teilblechpaketen so zusammengesetzt ist, dass im Querschnitt gesehen die Umfangskontur in einem ersten Bereich des Blechpakets Stufen aufweist (Fig. 3), während sie in einem anderen Bereich ein Kreisbogen ist, der konzentrisch um die Kernschenkelachse verläuft. Dadurch wird der Rauminhalt des Zylinderabschnittes effizient für die Abschirmung des Streuflusses genutzt. Der Streufeldschirm benötigt kein zusätzliches Bauvolumen und folglich entsteht auch kein zusätzlicher Bedarf an Leitermaterial für die Herstellung der elektrischen Wicklung.It may be favorable if the laminated core of the core leg is made of partial laminated cores in such a way that seen in cross section the peripheral contour has steps in a first region of the laminated core (FIG. 3), while in another region it is a circular arc which concentrically surrounds it Core thigh axis runs. As a result, the volume of the cylinder portion is used efficiently for the shielding of the leakage flux. The stray field does not require any additional construction volume and consequently there is no additional requirement for conductor material for the production of the electrical winding.
Ein weiter Betrag zur Kostensenkung kann dadurch erreicht werden, indem der Klebstoff jeweils nur teilflächig auf den Breitflächen der Blechlamellen des Streufeldschirms aufgetragen wird.A further amount for cost reduction can be achieved by the adhesive is applied only part of the area on the wide surfaces of the laminations of the litter field.
Hinsichtlich der Festigkeit der Klebeverbindung kann es von Vorteil sein, wenn die zur Schenkelachse zeigenden Blechlamellen-Stirnfläche in einer Ebene bündig angeordnet sind. Es hat sich bewährt, wenn die Fügeflächen der Metall- Klebeverbindung durch mechanische oder durch chemische Oberflächen-Behandlungsverfahren entsprechend vorbehandelt sind.With regard to the strength of the adhesive bond, it may be advantageous if the laminations facing the leg axis lamination end face are arranged flush in a plane. It has proven useful if the joining surfaces of the metal adhesive bond are pretreated by mechanical or by chemical surface treatment methods.
Eine besonders hohe Festigkeit der Metall-Klebeverbindung kann erreicht werden, wenn die Blechlamellen-Stirnflächen eine geringe mechanische Rauhigkeit aufweisen, z.B. geschliffen sind.A particularly high strength of the metal adhesive bond can be achieved if the lamination end faces have a low mechanical roughness, e.g. are ground.
Ein Klebstoff auf der Basis von Cyanacrylatsäureestern hat sich hinsichtlich der mechanischen Festigkeit und unter fertigungstechnischen Gesichtspunkten als besonders günstig erwiesen.An adhesive based on Cyanoacrylate acid esters has proven to be particularly favorable in terms of mechanical strength and manufacturing aspects.
Kurzbeschreibung der ZeichnungenBrief description of the drawings
Zur weiteren Erläuterung der Erfindung wird im nachfolgenden Teil der Beschreibung auf die Zeichnungen Bezug genommen in denen weitere vorteilhafte Ausgestaltungen, Einzelheiten und Weiterbildungen der Erfindung zu entnehmen sind. Es zeigt:To further explain the invention, reference is made in the following part of the description to the drawings in which further advantageous embodiments, details and further developments of the invention can be found. It shows:
Figur 1 einen erfindungsgemäßen Transformator in einer räumlichen Skizze mit einem Schirmblechpaket längs des Kernschenkels;Figure 1 shows a transformer according to the invention in a three-dimensional sketch with a shroud packet along the core leg;
Figur 2 eine Querschnittsdarstellung einer ersten Ausführung des Kernschenkels der Figur 1; Figur 3 eine Querschnittsdarstellung einer zweiten Ausführung mit einem aus Teilblechpaketen stufenweise zusammengesetzten KernschenkelFigure 2 is a cross-sectional view of a first embodiment of the core leg of Figure 1; FIG. 3 is a cross-sectional view of a second embodiment with a core leg assembled in stages from partial laminated cores
Ausführung der ErfindungEmbodiment of the invention
Die perspektivische Darstellung der Figur 1 zeigt in einer vereinfachten Darstellung einen an sich bekannten Dreischenkeltransformator, dessen Kern 1 geblecht ist. DerThe perspective view of Figure 1 shows a simplified representation of a known Drekelkeltransformator whose core 1 is laminated. Of the
Kern 1 besteht im Wesentlichen aus den drei Kernschenkeln 2', 2' ' , 2' ' ' , dem unteren Joch 5 und dem oberen Joch 6. Jeder der Schenkel 2' , 2' ' , 2''' trägt eine Wicklungsanordnung 13, die in Figur 1 durch eine unterbrochene Zeichnungslinie angedeutet ist.Core 1 consists essentially of the three core legs 2 ', 2' ', 2' '', the lower yoke 5 and the upper yoke 6. Each of the legs 2 ', 2' ', 2' '' carries a winding assembly 13, which is indicated in Figure 1 by a broken line drawing.
Wie aus der räumlichen Skizze der Figur 1 ferner zu entnehmen ist, ist jeder der Schenkel 2' , 2' ' , 2''' jeweils aus einem (Kernschenkel-) Blechpaket 3 und aus zwei zusätzlichen Blechpaketen 4'und 4' 'zusammengesetzt. Wie unten näher ausgeführt, fungieren die Blechpakete 4', 4'' als Streufeldschirm. In Stapelrichtung gesehen ist das Blechpaket 3 endseitig durch Endlamellen 7' , 7 '' abgeschlossen . Das in Figur 1 vorne liegende Blechpaket 4' liegt an einer vorderen Endlamelle 7 'des Blechpakets 3 an; das rückwärts liegendeAs can also be seen from the three-dimensional sketch of FIG. 1, each of the legs 2 ', 2' ', 2' '' is composed of one (core leg) laminated core 3 and of two additional laminated cores 4 'and 4' '. As explained in more detail below, the laminated cores 4 ', 4' 'act as stray field screen. As seen in the stacking direction, the laminated core 3 is terminated by end blades 7 ', 7 ". The front plate core 4 'lying in Figure 1 is applied to a front end plate 7' of the laminated core 3; the backward one
Blechpaket 4'' liegt an einer rückwärtigen Endlamelle 1'' des Blechpakets 3 an. Das Blechpaket 3 ist zur Führung des Hauptflusses des Trafos dimensioniert. Die beiden zusätzlichen Blechpakete 4 'und 4'' bilden einen Streufeldschirm, d.h. sie dienen zur Abschirmung des magnetischen Streuflusses: Sie leiten den aus dem Luftraum eintretenden Streufluss im Bereich des Schenkels 2' , 2' ' , 2''' auf sich, so dass dieser nicht flächig in eine Endlamelle 7' bzw. 7'' (siehe Figur 2) eintreten und dort in Folge von Induktion Wirbelströme hervorrufen kann. In ihrer axialen Längserstreckung werden die Blechpakete 4' bzw. 4'' jeweils durch das untere bzw. obere Jochteil 5 bzw. 6 begrenzt, indem sie stumpf auf die in Figur 1 vertikal verlaufenden Blechlamellen des Jochs 5 bzw. 6 stoßen. Im Bereich des Stoßes ist der Übergang zwischen dem Streufeldschirm 4', 4'' und dem Joch 5, 6 bündig.Sheet metal package 4 '' is applied to a rear end plate 1 '' of the laminated core 3. The laminated core 3 is dimensioned to guide the main flow of the transformer. The two additional laminated cores 4 'and 4''form a stray field shield, ie they serve to shield the magnetic flux leakage: They conduct the leakage flux entering from the air space in the region of the leg 2', 2 '', 2 ''', so that this is not flat in one Endlamelle 7 'and 7''(see Figure 2) enter and there may cause eddy currents as a result of induction. In their axial longitudinal extent the laminated cores 4 'and 4''respectively bounded by the lower and upper yoke member 5 and 6, by butting stump on the vertical in Figure 1 extending laminations of the yoke 5 and 6 respectively. In the region of the impact, the transition between the stray field shield 4 ', 4''and the yoke 5, 6 is flush.
Die Figur 2 zeigt eine Querschnitts-Darstellung desFIG. 2 shows a cross-sectional view of the
Kernschenkels der Figur 1. Die mit dem Bezugszeichen 16 gekennzeichnete Verbindung zwischen dem Blechpaket 3 und dem Streufeldschirm 4', 4'' erfolgt durch eine Metall- Klebeverbindung, also durch StoffSchluss, d.h. durch atomare oder molekulare Kräfte. Die Verbindung 16 kann aber auch anders, beispielsweise als (Punkt-) Schweiß- oder Lötverbindung ausgebildet sein, sie kann aber auch durch eine in der Zeichnung nicht dargestellte Pressvorrichtung durch Reibschluss hergestellt sein. Die Blechlamellen 40', 40'' des Streufeldschirms 4' bzw. 4'' werden ebenfalls von einem Klebstoff zusammengehalten. Dieser ist zumindest teilflächig zwischen benachbarten Breitflächen der Lamellen 40', 40'' aufgetragen und bewirkt nicht nur die Paketierung der Bleche, sondern trägt gleichzeitig auch zur elektrischen Isolierung zwischen den Blechen bei. Insgesamt ist durch diese Konstruktion ein kompakter Aufbau von Kernschenkel-Blechpaket 3 und Streufeldschirm 4', 4'' möglich. Ein weiterer Vorteil der Klebeverbindungen ist darin zu sehen, dass dadurch Betriebsgeräusche eines Transformators verringert werden können.Core leg of Figure 1. The marked with the reference numeral 16 connection between the laminated core 3 and the stray field screen 4 ', 4' 'is effected by a metal adhesive bond, ie by StoffSchluss, i. by atomic or molecular forces. However, the connection 16 can also be designed differently, for example as a (spot) welding or soldering connection, but it can also be produced by a pressure device, not shown in the drawing, by frictional engagement. The laminations 40 ', 40' 'of the stray field shield 4' and 4 '' are also held together by an adhesive. This is at least part of the area between adjacent broad surfaces of the fins 40 ', 40' 'applied and not only causes the packaging of the sheets, but also contributes to the electrical insulation between the sheets at the same time. Overall, a compact construction of core leg laminated core 3 and stray field shield 4 ', 4' 'is possible by this construction. Another advantage of the adhesive joints is the fact that thereby operating noise of a transformer can be reduced.
Als Klebstoff geeignet sind insbesondere einkomponentige Produkte auf der Basis von Cyanacrylatsäureestern, die durch Luftfeuchtigkeit aushärten. Insbesondere geeignet ist eine Klebstoff-Viskosität von einigen hundert mPas, insbesondere 500-700 mPas, gemessen bei 25 Grad Celsius. Diese Klebstoffe können leicht durch automatisierte Fertigungswerkzeuge bei der Herstellung des Trafokerns aufgebracht werden. Als besonders vorteilhaft hat sich in der Praxis eine Vorbehandlung der Fügeflächen gezeigt. Eine mechanische Vorbehandlung, insbesondere ein Schleifen der Blechlamellen- Stirnflächen 9', 9'' (Figur 2) des Blechpaketes 4', 4'', erhöht die Festigkeit der Klebeverbindung erheblich. Günstig ist auch, wenn die Breitfläche 8', 8' (Figur 2) einer Endlamelle 7' , 1'' z.B. durch chemische Oberflächen- Behandlungsverfahren behandelt wird. Dies kann beispielsweise durch Anodisieren dieser Anlagefläche 8', 8'' und/oder der Blechlamellen-Stirnflächen 9', 9'' erfolgen.Suitable adhesives are in particular one-component products based on cyanoacrylate acid esters, which Cure humidity. Particularly suitable is an adhesive viscosity of a few hundred mPas, in particular 500-700 mPas, measured at 25 degrees Celsius. These adhesives can be easily applied by automated manufacturing tools in the manufacture of the transformer core. In practice, a pretreatment of the joining surfaces has proven to be particularly advantageous. A mechanical pretreatment, in particular a grinding of the lamination end faces 9 ', 9 "(FIG. 2) of the laminated core 4', 4", considerably increases the strength of the adhesive bond. It is also favorable if the wide surface 8 ', 8' (FIG. 2) of an end plate 7 ', 1 "is treated, for example, by chemical surface treatment methods. This can be done, for example, by anodizing this contact surface 8 ', 8 "and / or the lamination end faces 9', 9".
Wie aus der Querschnitts-Darstellung der Figur 2 leicht zu entnehmen ist, schließt jeweils eine Endlamelle 7' bzw. 1'' das Blechpaket 3 oben bzw. unten ab. Die Schichtebenen 14 dieses Blechpaket-Körpers 3 verlaufen in Figur 2 wagerecht und stehen im Wesentlichen senkrecht zu den Schichtebenen 15 des vorderen Blechpakets 4 bzw. des rückwärtigen Blechpaketes 4''. Die beiden Blechpakete 4 'und 4'' wirken bezüglich des auf die Eintrittsfläche der Endlamelle 7' bzw. 1'' gerichteten Streuflusses als "Magnetschild": sie nehmen denAs can be easily seen from the cross-sectional illustration of FIG. 2, an end plate 7 'or 1 "in each case closes the laminated core 3 at the top or bottom. The layer planes 14 of this laminated core body 3 extend in a straightforward manner in FIG. 2 and are substantially perpendicular to the layer planes 15 of the front laminated core 4 or of the rear laminated core 4 ''. The two laminated cores 4 'and 4' 'act with respect to the on the entrance surface of the end plate 7' and 1 '' stray flux as a "magnetic shield": they take the
Streufluss selbst auf und verhindern, dass dieser in eine der Endlamellen 7' , 7'' eintreten kann. Damit wird der Streufluss daran gehindert, in einer Blechlamelle des Blechpakets 3 Wirbelstromverluste zu verursachen. In Figur 2 ist beispielhaft eine einzige Feldlinie 11 des Streuflusses dargestellt. Das "Magnetschild" liegt unmittelbar am Blechpaket 3 an und bildet einen integralen Bestandteil des Kernschenkels . Bei der Produktion von Leistungstransformatoren werden üblicherweise die Kernbleche aus einer Blechbahn eines hochpermeablen weichmagnetischen Werkstoffs gefertigt. Üblich ist eine Blechbahn-Dicke zwischen 0,23 mm bis 0,35Leakage flux itself and prevent it from entering one of the end plates 7 ', 7''. Thus, the leakage flux is prevented from causing 3 eddy current losses in a lamination of the laminated core. FIG. 2 shows an example of a single field line 11 of the leakage flux. The "magnetic shield" is located directly on the laminated core 3 and forms an integral part of the core leg. In the production of power transformers usually the core sheets are made from a sheet metal strip of a high-permeability soft magnetic material. A typical sheet thickness is between 0.23 mm and 0.35 mm
Millimeter. Der Zuschnitt der einzelnen Bleche erfolgt durch Stanzen oder Schneiden. Dabei beleibt in der Blechbahn stets Restmaterial stehen. Dieses Restmaterial kann günstig für die Herstellung der Streufeldschirmung (d.h. für die Herstellung der Blechpakete 4', 4'') verwendet werden, indem das bahnförmige Restmaterial zunächst aufgewickelt, dann gepresst und letztlich im Stapel auf Form geschnitten wird. Im Ausführungsbeispiel ist die Lamellendicke D3 des Blechpakets 3 gleich groß mit der Lamellendicke D4 des Streufeldschirms 4', 4''. Das Blechpaket 3 und der Streufeldschirm 4', 4'' sind aus dem gleichen weichmagnetischen Werkstoff hergestellt .Millimeter. The cutting of the individual sheets is done by punching or cutting. It remains obese in the metal sheet always residual material. This remainder material can be favorably used for the production of the stray shield (i.e., for the manufacture of laminations 4 ', 4' ') by first winding up the web-like stock material, then pressing it and finally cutting it to shape in the stack. In the exemplary embodiment, the lamella thickness D3 of the laminated core 3 is the same size with the lamella thickness D4 of the stray field shield 4 ', 4' '. The laminated core 3 and the stray field shield 4 ', 4' 'are made of the same soft magnetic material.
In der Figur 3 ist ein zweites Ausführungsbeispiel der Erfindung skizziert, bei dem der Querschnitt desIn the figure 3, a second embodiment of the invention is sketched, in which the cross section of
Kernschenkels kreisförmig ist. Das Blechpaket 3 ist hier aus Teilblechpaketen 3', 3' ' , 3''' usw. zusammengesetzt und mit den Schirmblechpaketen 4' bzw. 4'' zu einem Schenkel- Blechpaket vereinigt. Die Umfangskontur des Blechpakets 3 verläuft im Bereich der Teilblechpakete 3' , 3' ' , 3''' stufig (siehe Stufen 18 im Bereich 17) . In jedem Zylinderabschnitt 10, der durch eine Endlamelle 7' , bzw. 7'' und durch die konzentrisch zur Schenkelachse 12 angeordnete Innenfläche der Wicklung 13 (in Figur 3 durch einen Kreis angedeutet) begrenzt ist, ist jeweils ein Streufeldschirm 4 'bzw. 4'' zur Abschirmung des Streuflusses angeordnet. Die Schichtungsebenen im Blechpaket 3 und im Streufeldschirm 4'bzw. 4'' stehen auch in Figur 3 aufeinander senkrecht. Jedes Blechpaket 4 'und 4'' liegt erfindungsgemäß jeweils mit den Stirnflächen 9' bzw. 9'' der Lamellen 40'bzw. 40'' an einer äußeren Breitfläche 8' bzw. 8'' an. Dadurch ist es möglich, dass der vom Luftraum eintretende Streufluss 11 vom "Magnetschild" 4', 4'' weitgehend aufgenommen und von diesem in axialer Richtung 12 eines Kernschenkels 2' , 2' ' , 2''' geführt werden kann ohne dass nennenswerte Wirbelströme und damit eine entsprechende Erwärmung im Blechpaket 3 hervorgerufen wird.Kernschenkels is circular. The laminated core 3 is here composed of partial laminated cores 3 ', 3'',3''', etc., and combined with the shroud packages 4 'and 4''to a leg-laminated core. The peripheral contour of the laminated core 3 extends in the region of the partial laminated cores 3 ', 3'',3''' in stages (see steps 18 in the area 17). In each cylinder portion 10, which is bounded by an end plate 7 ', or 7''and by the concentric to the leg axis 12 inner surface of the winding 13 (indicated by a circle in Figure 3), in each case a stray field screen 4' or 4 '' arranged to shield the stray flux. The stratification levels in the laminated core 3 and the stray field screen 4'bzw. 4 '' are also perpendicular to each other in Figure 3. Each laminated core 4 'and 4''according to the invention is in each case with the end faces 9' and 9 '' of the fins 40'bzw. 40 '' on an outer wide surface 8 'and 8''to. As a result, it is possible for the leakage flux 11 entering from the air space to be largely absorbed by the "magnetic shield" 4 ', 4 "and to be guided by it in the axial direction 12 of a core leg 2', 2", 2 '''without appreciable Eddy currents and thus a corresponding heating in the laminated core 3 is caused.
Der Vorteil der erfindungsgemäßen Konstruktion ist insbesondere darin sehen, dass der Streufeldschirm 4' bzw. 4'' integraler Bestandteil des Kerns des Transformators 1 ist. Durch die Klebeverbindung entfallen die im Stand der Technik bekannten, meist massiv ausgebildetenThe advantage of the construction according to the invention is in particular that the stray field shield 4 'or 4' 'is an integral part of the core of the transformer 1. The adhesive connection eliminates the known in the prior art, usually solid
Befestigungsvorrichtungen für das "Magnetschild". Dies ist aus der Querschnittsdarstellung der Figur 3 gut zu entnehmen: die Belchlamellenpakete 4' bzw. 4'' liegen direkt an den jeweiligen Endlamellen 7'bzw 7'' des (Kernschenkel- ) Blechpaketes 3 an . Da keine Spannleisten oder Spannkeile im Wicklungsfenster vorhanden sind, wird kein zusätzlicher Raum beansprucht. Die elektrische Wicklung 13 muss daher nicht größer dimensioniert werden.Fasteners for the "magnetic shield". This is clear from the cross-sectional view of Figure 3: the Belchlamellenpakete 4 'and 4' 'are directly to the respective Endlamellen 7'bzw 7' 'of the (core leg) laminated core 3 at. Since there are no clamping strips or clamping wedges in the winding window, no additional space is required. The electrical winding 13 therefore does not have to be dimensioned larger.
Wie im Ausführungsbeispiel der Figur 1 skizziert, schließt der Streufeldschirm 4', 4'' an der Stoßstelle zum unteren Joch 4 bzw. zum oberen Joch 5 nahtlos an. Entsprechendes gilt für das in Figur 3 skizzierte zweite Ausführungsbeispiel. In beiden Fällen führt der Streufeldschirm 4', 4'' auch einen Teil des Hauptflusses, das heißt er erfüllt eine zweifache Funktion, nämlich die der Führung des Hauptflusses und die der Schirmung des Streuflusses. Da die einzelnen Lamellen 40', 40'' des Blechpaketes 4', 4'' durch Klebstoff zusammengehalten werden, entfallen auch Befestigungsvorrichtungen für diese Bleche, d.h. es gibt keine massiven Trägerplatten, die ungünstig hinsichtlich der Ausbildung von Wirbelströmen sind und auch aufwendig in der Herstellung sind.As outlined in the embodiment of Figure 1, the stray field shield 4 ', 4''at the junction to the lower yoke 4 and the upper yoke 5 connects seamlessly. The same applies to the sketched in Figure 3 second embodiment. In both cases, the stray field screen 4 ', 4''also performs a part of the main flow, that is, it performs a dual function, namely the leadership of the main flow and the shielding of the leakage flux. Since the individual blades 40 ', 40''of the laminated core 4', 4 '' are held together by adhesive, also eliminates fastening devices for these sheets, ie there are no solid support plates, which are unfavorable in terms of the formation of eddy currents and also consuming in the Production are.
Ein weiter Vorteil der vorliegenden Erfindung ist darin zu sehen, dass die Emission von Betriebsgeräuschen durch den elastischen Materialschluss der Klebeverbindungen geringer ist .A further advantage of the present invention is the fact that the emission of operating noise due to the elastic material closure of the adhesive bonds is lower.
Aus der Figur 3 wird ein weiter Vorteil des dargestellten Ausführungsbeispiels ersichtlich: wenn die in radialer Richtung gesehene Erstreckung der einzelnen Lamellen 40',FIG. 3 shows a further advantage of the illustrated exemplary embodiment: if the extent of the individual lamellae 40 'seen in the radial direction,
40'' des Blechpaketes 4' bzw. 4'' an die Umfangskontur 19 der Wicklung 13 (Kreisbogen) angeglichen ist, kann der durch den Zylinderabschnitt 10 vorgegebene Rauminhalt im Wicklungsfenster sehr effizient zur Führung des magnetischen Fluss genützt werden.40 '' of the laminated core 4 'and 4' 'to the peripheral contour 19 of the winding 13 (circular arc) is aligned, the predetermined by the cylinder portion 10 volume in the winding window can be used very efficiently for guiding the magnetic flux.
Selbstverständlich kann die Breite der einzelnen Blechlamellen 40' bzw. 40'' eines Streufeldschirm- Blechpaketes 4 'bzw. 4'' aber auch gleich groß sein oder stufig ausgebildet sein (in Figur 3 nicht dargestellt) .Of course, the width of the individual laminations 40 'and 40' 'of a stray field shield laminated core 4' or 4 '' but also be the same size or be stepped (not shown in Figure 3).
Es versteht sich, dass die Erfindung nicht auf eine bestimmte Bauform eines Transformators oder eines Drosselkerns eingeschränkt ist. Zusammenstellung der verwendeten BezugszeichenIt is understood that the invention is not limited to a specific design of a transformer or a choke core. Compilation of the reference numbers used
I Transformatorkern 2 ' , 2 ' ' , 2 ' KernschenkelI transformer core 2 ', 2' ', 2' core legs
3 (Kernschenkel-) Blechpaket3 (core leg) laminated core
4 ' , 4 ' Streufeldschirm4 ', 4' stray field screen
5 unteres Joch5 lower yoke
6 oberes Joch 7' , 7' ' Endlamelle6 upper yoke 7 ', 7' 'Endlamelle
8', 8' äußere Breitfläche von 7 'bzw. 7'' 9', 9'' Blechlamellen-Stirnfläche 10 Zylinderabschnitt8 ', 8' outer broad surface of 7 'and 7 '' 9 ', 9' 'lamination end face 10 cylinder section
II Feldlinie (Streufluss) 12 SchenkelachseII field line (stray flux) 12 leg axis
13 Wicklungsanordnung13 winding arrangement
14 Schichtebene von 314 layer plane of 3
15 Schichtebene von 415 layer plane of 4
16 Stoffschlüssige Verbindung 17 Bereich Umfangskontur von 316 cohesive connection 17 area peripheral contour of 3
18 Stufe18 level
19 Bereich Umfangskontur von 4', 4''19 area circumferential contour of 4 ', 4' '
40', 40'' Blechlammellen des Streufeldschirms 4', 440 ', 40' 'sheet metal slats of the stray field shield 4', 4th
D3 Lamellendicke von 3D3 slat thickness of 3
D4 Lamellendicke von 4', 4'' D4 lamella thickness of 4 ', 4' '

Claims

Patentansprüche claims
1. Transformatorkern mit einer Streufeldschirmung, der zumindest einen eine Wicklungsanordnung (13) tragenden aus einem Blechpaket (3) gebildeten Kernschenkel (2', 2' ' , 2''') aufweist, wobei das Blechpaket (3) durch Endlamellen (7', 7'') abgeschlossen ist, wobei jeder Endlamelle (7'' , 7'') jeweils ein Streufeldschirm (4', 4'') zugeordnet ist, welcher geschichtete Blechlamellen (40', 40'') aufweist, deren1. Transformer core with a stray shield having at least one winding arrangement (13) carrying from a laminated core (3) formed core leg (2 ', 2' ', 2' ''), wherein the laminated core (3) by Endlamellen (7 ' , 7 '') is closed, wherein each end plate (7 '', 7 '') is assigned in each case a stray field screen (4 ', 4' '), which has laminated laminations (40', 40 '') whose
Schichtebenen (15) senkrecht zu den Schichtebenen (14) des Blechpakets (3) angeordnet sind, dadurch gekennzeichnet, dass die Blechlammellen (40', 40'') mit zum Blechpaket (3) weisenden Blechlamellen- Stirnflächen (9', 9'') an einer äußeren Breitfläche (8', 8'') einer zugeordneten Endlamelle (7', 7'') anliegend angeordnet sind.Layer planes (15) are arranged perpendicular to the layer planes (14) of the laminated core (3), characterized in that the sheet metal slats (40 ', 40' ') to the laminated core (3) facing Blechlamellen- end faces (9', 9 '' ) are arranged adjacent to an outer wide surface (8 ', 8' ') of an associated end plate (7', 7 '').
2. Transformatorkern nach Anspruch 1, dadurch gekennzeichnet, dass zwischen benachbart liegenden2. Transformer core according to claim 1, characterized in that lying between adjacent
Blechlamellen (40', 40'') eines Streufeldschirms (4', 4'') eine Klebstoff vorhanden ist.Sheet metal fins (40 ', 40' ') of a stray field screen (4', 4 '') an adhesive is present.
3. Transformatorkern nach Anspruch 2, dadurch gekennzeichnet, dass der Streufeldschirm (4', 4'') an der Breitfläche (8', 8'') einer zugeordneten Endlamelle (7', 7'') mittels Klebstoff befestigt ist.3. transformer core according to claim 2, characterized in that the stray field shield (4 ', 4' ') on the wide surface (8', 8 '') of an associated end plate (7 ', 7' ') is fixed by means of adhesive.
4. Transformatorkern nach Anspruch 1, 2, oder 3 dadurch gekennzeichnet, dass jede Blechlamelle (40', 40'') eine Lamellendicke (D4) aufweist, die so groß ist, wie eine Lamellendicke (D3) einer Blechlamelle des Blechpakets (3) . 4. transformer core according to claim 1, 2, or 3, characterized in that each lamination (40 ', 40'') has a lamella thickness (D4) which is as large as a lamella thickness (D3) of a lamination of the laminated core (3) ,
5. Transformatorkern nach Anspruch 4, dadurch gekennzeichnet, dass das Blechpaket (3) und der Streufeldschirm (4', 4'') aus dem gleichen weichmagnetischen Werkstoff hergestellt sind.5. transformer core according to claim 4, characterized in that the laminated core (3) and the stray field screen (4 ', 4' ') are made of the same soft magnetic material.
6. Transformatorkern nach Anspruch 5, dadurch gekennzeichnet, dass das Blechpaket (3) aus Teilblechpaketen (3', 3' ' , 3''') so zusammengesetzt ist, dass im Querschnitt gesehen die Umfangskontur in einem Bereich (17) des Blechpakets (3) Stufen (18) aufweist (Fig. 3) und in einem Bereich (19) des Streufeldschirms (4', 4'') ein Kreisbogen ist, der konzentrisch zu einer Kernschenkelachse (12) ist.6. transformer core according to claim 5, characterized in that the laminated core (3) of partial laminated cores (3 ', 3' ', 3' '') is composed so that in cross-section the peripheral contour in a region (17) of the laminated core ( 3) has steps (18) (FIG. 3) and in a region (19) of the stray field screen (4 ', 4' ') is a circular arc, which is concentric with a core leg axis (12).
7. Transformatorkern nach Anspruch 4, dadurch gekennzeichnet, dass der Klebstoff zwischen benachbart liegenden Breitflächen der Blechlamellen (40', 40'') teilflächig ausgebildet ist.7. transformer core according to claim 4, characterized in that the adhesive between adjacent wide surfaces of the laminations (40 ', 40' ') is formed part of the surface.
8. Transformatorkern nach Anspruch 4, dadurch gekennzeichnet, dass die zum Blechpaket (3) weisenden Blechlamellen-Stirnflächen (9', 9'') in der Ebene einer Breitfläche (8'. 8'') liegend angeordnet sind.8. transformer core according to claim 4, characterized in that the laminated core (3) facing sheet-metal end faces (9 ', 9' ') in the plane of a wide surface (8', 8 '') are arranged lying.
9. Transformatorkern nach Anspruch 4, dadurch gekennzeichnet, dass die Blechlamellen-Stirnflächen9. transformer core according to claim 4, characterized in that the lamination end faces
(9', 9'') geschliffen sind.(9 ', 9' ') are ground.
10. Transformatorkern Anspruch 4, dadurch gekennzeichnet, dass der Klebstoff ein Cyanacrylat-Klebstoff ist. 10. Transformer core claim 4, characterized in that the adhesive is a cyanoacrylate adhesive.
EP07821945A 2007-10-29 2007-10-29 Transformer core having a stray field shield Active EP2206126B1 (en)

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ES2382054T3 (en) 2012-06-04
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ATE549725T1 (en) 2012-03-15
CN101933106A (en) 2010-12-29

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