EP0024319B1 - Process for making e-shaped core laminations and i-shaped yoke laminations for a choke or transformer, particularly for gas discharge lamps - Google Patents

Process for making e-shaped core laminations and i-shaped yoke laminations for a choke or transformer, particularly for gas discharge lamps Download PDF

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Publication number
EP0024319B1
EP0024319B1 EP80104497A EP80104497A EP0024319B1 EP 0024319 B1 EP0024319 B1 EP 0024319B1 EP 80104497 A EP80104497 A EP 80104497A EP 80104497 A EP80104497 A EP 80104497A EP 0024319 B1 EP0024319 B1 EP 0024319B1
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EP
European Patent Office
Prior art keywords
shaped
shaped core
punched
accordance
outer legs
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EP80104497A
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German (de)
French (fr)
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EP0024319A1 (en
Inventor
Bernhard Albeck
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Vossloh Schwabe GmbH
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SCHWABE GmbH and CO KG ELEKTROTECHNISCHE FABRIK
Schwabe & Co KG Elektrotechnische Fabrik GmbH
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Priority to DE2933781A priority patent/DE2933781C2/en
Application filed by SCHWABE GmbH and CO KG ELEKTROTECHNISCHE FABRIK, Schwabe & Co KG Elektrotechnische Fabrik GmbH filed Critical SCHWABE GmbH and CO KG ELEKTROTECHNISCHE FABRIK
Publication of EP0024319A1 publication Critical patent/EP0024319A1/en
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus 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
    • H01F41/02Apparatus 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
    • H01F41/0206Manufacturing of magnetic cores by mechanical means
    • H01F41/0233Manufacturing of magnetic circuits made from sheets
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/24Magnetic cores
    • H01F27/245Magnetic cores made from sheets, e.g. grain-oriented

Description

Die Erfindung betrifft ein Verfahren zum Herstellen E-förmiger Kernbleche und zwischen deren Aussenschenkel passender I-förmiger Rückschlussbleche einer Drossel oder eines Transformators, insbesondere für die Verwendung als Vorschaltgerät für Gasentladungslampen.The invention relates to a method for producing E-shaped core sheets and matching I-shaped return sheets of a choke or a transformer between their outer legs, in particular for use as a ballast for gas discharge lamps.

Mit dem abfallosen Herstellen der E-förmigen Kernbleche und der I-förmigen Rückschlussbleche für Mantelkerne nach DIN 41300, Bl. 2, ist bereits ein Stanzverfahren bekannt, bei dem zwei E-förmige Kernbleche mit den Schenkeln derart gegeneinander gekehrt sind, dass zwei I-förmige Rückschlussbleche durch Ausstanzen der zwischen den Schenkeln befindlichen Räume gebildet werden. Dieser Blechschnitt lässt sich zwar ohne Stanzabfall herstellen, jedoch ist nachteilig, dass der Luftspalt zwischen dem Mittelschenkel der E-förmigen Kernbleche und den I-förmigen Rückschlussblechen durch die Festlegung im Stanzwerkzeug eine bestimmte Grösse hat. Es fehlt damit die Möglichkeit, die Luftspaltgrösse zwecks Ausschaltung von Fertigungstoleranzen auf einen gewünschten Wert einzustellen. Somit ist es auch nicht möglich, mit diesem bekannten Stanzverfahren bei optimaler Ausnutzung des Wickelraumes den einer beliebigen Impedanz zugeordneten Luftspalt zu erzeugen. Selbst mit dem hohen Aufwand von mehreren verschiedenen Stanzwerkzeugen liesse sich nur eine grobe Abstufung erreichen. Ausserdem führt das Ausstanzen des für jede Wicklung erforderlichen Luftspaltes zu einem zusätzlichen Fertigungsaufwand, der bei den hohen Lohnkosten nicht tragbar ist. Es wäre zwar möglich, Luftspalteinlagen zwischen den Enden der Aussenschenkel des E-förmigen Kernblechs und den Enden des I-förmigen Rückschlussbleches anzuordnen. Das erfordert jedoch nicht nur eine aufwendigere Montageanordnung für den Zusammenhalt der E- und 1-Lamellen,sondern als Folge der äusseren Luftspalte entsteht auch ein magnetischer Streufluss, der zu störenden Brummgeräuschen führen kann.With the waste-free production of the E-shaped core sheets and the I-shaped yoke sheets for jacket cores according to DIN 41300, sheet 2, a stamping process is already known in which two E-shaped core sheets with the legs are turned against each other in such a way that two I- Shaped yoke plates are formed by punching out the spaces between the legs. Although this sheet metal cut can be produced without punching waste, it is disadvantageous that the air gap between the middle leg of the E-shaped core sheets and the I-shaped backing sheets has a certain size due to the fixing in the punching tool. It is therefore not possible to set the air gap size to a desired value in order to eliminate manufacturing tolerances. It is therefore also not possible to use this known stamping method to produce the air gap associated with any impedance with optimum use of the winding space. Even with the high effort of several different punching tools, only a rough gradation could be achieved. In addition, the punching out of the air gap required for each winding leads to an additional manufacturing effort which is not acceptable given the high labor costs. It would be possible to arrange air gap inserts between the ends of the outer legs of the E-shaped core sheet and the ends of the I-shaped yoke sheet. However, this not only requires a more complex assembly arrangement for the cohesion of the E and 1 lamellae, but as a result of the outer air gaps, a magnetic leakage flux also occurs, which can lead to disturbing humming noises.

Aus der OE-B Nr. 294270 ist auch ein Blechschnitt für einen Mantelkern bekannt, der aus E-förmigen Kernblechen und I-förmigen Rückschlussblechen gebildet wird, wobei die I-förmigen Rückschlussbleche zwischen die Schenkel der E-förmigen Kernbleche passend eingeschoben werden. Hier wird angestrebt, einen Mantelkern ohne Rücksicht auf die Lamellenform mittels Gehäusemantel und Boden derart zu umschliessen, dass keine magnetische Streuung auftritt, und die Lamellen fest gegeneinander zu pressen.From OE-B No. 294270 a sheet metal cut for a jacket core is also known, which is formed from E-shaped core sheets and I-shaped backing sheets, the I-shaped backing sheets being inserted between the legs of the E-shaped core sheets. The aim here is to enclose a jacket core without regard to the lamella shape by means of the housing jacket and bottom in such a way that no magnetic scatter occurs, and to press the lamellae firmly against one another.

Der Erfindung liegt die Aufgabe zugrunde, das Herstellungsverfahren für die Lamellen derart zu gestalten, dass nicht nur das E-förmige Kernblech und das I-förmige Rückschlussblech abfallos oder abfallarm gestanzt werden, sondern die Lamellen im magnetischen Kreis derart angeordnet werden können, dass der Luftspalt nach Bedarf eingestellt werden kann. Diese Aufgabe wird gelöst, indem gemäss der Erfindung zwei Reihen E-förmiger Kernbleche mit den offenen Seiten gegenüber- und aneinanderliegend und derart versetzt zueinander ausgestanzt werden, dass die Enden der aneinanderliegenden Aussenschenkel zweier benachbarter E-förmiger Kernbleche an dem Ende des Mittelschenkels des gegenüberliegenden, versetzten E-förmigen Kernbleches anliegen und aus den zwischen den Aussenschenkeln und den Mittelschenkeln der gegenüberliegenden E-förmigen Kernbleche entstehenden freien Räumen die I-förmigen Rückschlussbleche ausgestanzt werden.The invention has for its object to design the manufacturing process for the lamellae in such a way that not only the E-shaped core plate and the I-shaped backing plate are punched with little or no waste, but the lamellae can be arranged in the magnetic circuit in such a way that the air gap can be adjusted as required. This object is achieved in that, according to the invention, two rows of E-shaped core sheets are punched out with the open sides opposite and adjacent to one another and offset from one another in such a way that the ends of the adjacent outer legs of two adjacent E-shaped core sheets at the end of the middle leg of the opposite, Staggered E-shaped core sheets rest and the I-shaped backing sheets are punched out of the free spaces created between the outer legs and the middle legs of the opposite E-shaped core sheets.

Zur Bildung des magnetischen Kreises werden die I-förmigen Rückschlussbleche zwischen die Aussenschenkel der E-förmigen Kernbleche passend eingeschoben. Am unteren und äusseren Teil der Aussenschenkel der E-förmigen Kernbleche befinden sich Ausnehmungen, in die nach Beendigung der Paketierung der Lamellen in bekannter Weise eine Klemmschiene mit ihren umgebogenen Längsrändern eingreifen kann.To form the magnetic circuit, the I-shaped yoke plates are inserted between the outer legs of the E-shaped core plates. On the lower and outer part of the outer legs of the E-shaped core sheets there are recesses into which a clamping rail with its bent longitudinal edges can engage in a known manner after the packaging of the slats has ended.

Dadurch, dass bei dem erfindungsgemässen Stanzverfahren die Aussenkanten der Aussenschenkel gegeneinander anliegen, können die beiden Ausnehmungen an ihnen mit einem einzigen Stempel ausgestanzt werden, womit auch eine stabilere Auslegung dieses Werkzeugteiles erzielt wird. Weiterhin wird mit dem Stanzverfahren der Vorteil erzielt, dass durch eine entsprechende Ausbildung des Stempels ausser den beiden Ausnehmungen zusätzlich noch eine Ausnehmung im Mittelschenkel des E-förmigen Kernbleches, die zur Aufnahme einer Luftspalteinlage dient, ausgestanzt werden kann.Because the outer edges of the outer legs lie against one another in the punching method according to the invention, the two recesses on them can be punched out with a single stamp, which also achieves a more stable design of this tool part. Furthermore, the advantage of the stamping process is that, in addition to the two recesses, a recess in the middle leg of the E-shaped core sheet, which serves to accommodate an air gap insert, can be punched out by a corresponding design of the stamp.

Zum Herstellen E-förmiger Kernbleche und zweier zwischen deren Schenkel eingelegter L-förmiger Rückschlussbleche ist auch schon ein Verfahren bekannt, bei dem zwei Reihen E-förmiger Kernbleche mit den offenen Seiten gegenüber- und aneinanderliegend ausgestanzt werden (DE-A Nr. 2638780). Bei diesem Verfahren übergreifen die Enden der aneinanderliegenden Aussenschenkel von zwei benachbarten E-förmigen Kernblechen sich gegenseitig, und der zwischen den Aussenschenkeln über dem Mittelschenkel eines E-förmigen Kernblechs freibleibende Raum wird von den beiden zu einem Rechteck zusammengelegten L-förmigen Rückschlussblechen ausgefüllt. Diese bekannte Gestaltung des E-förmigen Kernbleches und der L-förmigen Rückschlussbleche hat den Nachteil, dass das Blechpaket aus drei Teilen besteht und daher keine ausreichende Festigkeit aufweist, da die L-förmigen mittleren Teile umkippbar sind.A method is also already known for producing E-shaped core sheets and two L-shaped yoke sheets inserted between their legs, in which two rows of E-shaped core sheets are punched out with the open sides opposite one another (DE-A No. 2638780). In this method, the ends of the adjoining outer legs of two adjacent E-shaped core sheets overlap each other, and the space left between the outer legs over the middle leg of an E-shaped core sheet is filled by the two L-shaped yoke sheets folded into a rectangle. This known design of the E-shaped core plate and the L-shaped yoke plates has the disadvantage that the laminated core consists of three parts and therefore does not have sufficient strength since the L-shaped middle parts can be tipped over.

Das Stanzverfahren gemäss der Erfindung kann vorteilhaft derart gestaltet werden, dass das I-förmige Rückschlussblech länger gemacht wird als der freie Raum zwischen den Aussenschenkeln des E-förmigen Kernbleches. Damit wird erreicht, dass das Paket der t-förmigen Rückschlussbleche unter Spannung zwischen die Aussenschenkel eingeschoben werden kann. Das gleiche Ziel kann auch durch Ausstanzen der Enden des I-förmigen Rückschlussbleches mit einer Abschrägung erreicht werden, jedoch mit dem zusätzlichen Vorteil, dass die Einführung des I-Paketes zwischen die Aussenschenkel des E-Paketes erleichtert wird.The stamping method according to the invention can advantageously be designed in such a way that the I-shaped yoke plate is made longer than the free space between the outer legs of the E-shaped core plate. This ensures that the package of t-shaped yoke plates under tension between the outer legs can be inserted. The same goal can also be achieved by punching out the ends of the I-shaped yoke plate with a bevel, but with the additional advantage that the introduction of the I-packet between the outer legs of the E-packet is facilitated.

In bestimmten Fällen kann es von Nutzen sein, den Raum für die Unterbringung der Wicklung zu vergrössern oder auch zu verkleinern. Diese Aufgabe wird dadurch gelöst, dass die Breite des I-förmigen Rückschlussbleches vergrössert oder verkleinert wird. Beim Ausstanzen wird damit eine grössere oder kleinere Fensterhöhe zwischen den Aussenschenkeln und dem Mittelschenkel des E-förmigen Kernbleches erreicht, ohne dass Abfall an Eisenmaterial entsteht.In certain cases it can be useful to enlarge or reduce the space for the winding. This object is achieved in that the width of the I-shaped yoke plate is increased or decreased. When punching out, a larger or smaller window height between the outer legs and the middle leg of the E-shaped core sheet is achieved without waste iron material.

Das Stanzverfahren gemäss der Erfindung dient bevorzugt zum Herstellen einer flachen Bauform einer Drossel, wobei kein Abfall an Eisenmaterial auftritt. Es sind jedoch Fälle möglich, die eine höhere Bauform der Drossel erfordern, ohne die Breite zu verändern. Dies hat zur Folge, dass die Summe der Längen des Mittelschenkels und des Aussenschenkels des E-förmigen Kernbleches bezogen auf den freien Raum zur Ausstanzung des I-förmigen Rückschlussbleches grösser ist als die Länge des I-förmigen Rückschlussbleches, wodurch ein geringfügiger Abfall an Eisenmaterial entsteht.The stamping method according to the invention is preferably used to produce a flat design of a choke, with no waste of iron material occurring. However, cases are possible that require a higher design of the throttle without changing the width. As a result, the sum of the lengths of the middle leg and the outer leg of the E-shaped core sheet in relation to the free space for punching out the I-shaped return sheet is greater than the length of the I-shaped return sheet, which results in a slight drop in iron material .

Ein wesentlicher Vorteil des Stanzverfahrens gemäss der Erfindung besteht auch darin, dass bei Bedarf eines Luftspaltes zwischen dem Mittelschenkel des E-förmigen Kernbleches und dem I-förmigen Rückschlussblech als Folge der Kürzung des Mittelschenkels sich der Aussenschenkel um den Betrag des Luftspaltes verlängert, wodurch ohne zusätzliches Eisenmaterial ein vergrösserter Wickelraum gebildet wird.A major advantage of the punching method according to the invention is that when an air gap is required between the middle leg of the E-shaped core plate and the I-shaped back plate as a result of the shortening of the middle leg, the outer leg is lengthened by the amount of the air gap, which means that there is no additional Iron material an enlarged changing room is formed.

Weitere Vorteile und Einzelheiten der Erfindung ergeben sich aus der folgenden Beschreibung einiger Ausführungsbeispiele. Es zeigen:

  • Fig. 1 eine Drossel mit nach dem Verfahren gemäss der Erfindung hergestellten Kern- und Rückschlussblechen in einem schematischen Schnitt,
  • Fig. 2 die Anordnung der E-Kernbleche und der I-Rückschlussbleche dieser Drossel bei dem abfallosen Stanzverfahren gemäss der Erfindung,
  • Fig. 3 ein mit dem erfindungsgemässen Verfahren hergestelltes E-förmiges Kernblech und ein I-förmiges Rückschlussblech mit abgeschrägten Enden, und
  • Fig. 4 die Anordnung der E-Kernbleche und der I-Rückschlussbleche bei dem abfallarmen Stanzverfahren gemäss der Erfindung.
Die in Fig. 1 dargestellte Drossel weist einen Eisenkern auf, der aus E-förmigen Kernblechen 1 und I-förmigen Rückschlussblechen 2 besteht. Die Mittelschenkel 3 der E-förmigen Kernbleche 1 sind von einer Spule 4 umfasst, die nach dem Wikkeln auf das Paket der E-Kernbleche 1 aufgeschoben ist. Zwischen dem I-förmigen Rückschlussblech 2 und dem Mittelschenkel 3 des E-förmigen Kernbleches 1 ist eine deformierbare Luftspalteinlage 4a angeordnet, die in eine Nut 5 hineinragt, die sich im Mittelschenkel 3 befindet. Mittels dieser Nut 5 ist verhindert, dass die Luftspalteinlage 4a bei der Montage ausser Mitte gelangt, so dass zusätzliche Wirbelstromverluste nichtzustandekommen können. Nachdem das Paket der I-förmigen Rückschlussbleche 2 zwischen die Aussenschenkel 6 des Paketes der E-förmigen Kernbleche 1 passend eingeschoben ist, wird anschliessend eine Klemmschiene 7 aufgesetzt, die mit nach oben und innen umgebogenen Längsrändern 8 um die Enden derAussenschenkel 6 herumgreift und sich mit ihren Längsrändern 8 in Ausnehmungen 9 an den Aussenschenkeln 6 hineinsetzt.Further advantages and details of the invention emerge from the following description of some exemplary embodiments. Show it:
  • 1 shows a throttle with core and yoke plates produced by the method according to the invention in a schematic section,
  • 2 shows the arrangement of the E-core sheets and the I-yoke sheets of this choke in the waste-free punching method according to the invention,
  • 3 shows an E-shaped core sheet produced with the method according to the invention and an I-shaped return sheet with bevelled ends, and
  • Fig. 4 shows the arrangement of the E-core sheets and the I-yoke sheets in the low-waste stamping process according to the invention.
The choke shown in Fig. 1 has an iron core, which consists of E-shaped core sheets 1 and I-shaped yoke plates 2. The middle legs 3 of the E-shaped core sheets 1 are encompassed by a coil 4 which, after winding, is pushed onto the package of the E core sheets 1. A deformable air gap insert 4a is arranged between the I-shaped yoke plate 2 and the middle leg 3 of the E-shaped core plate 1, which projects into a groove 5 which is located in the middle leg 3. This groove 5 prevents the air gap insert 4a from moving out of the center during assembly, so that additional eddy current losses cannot occur. After the package of I-shaped yoke plates 2 has been inserted between the outer legs 6 of the package of E-shaped core sheets 1, a clamping rail 7 is then placed, which grips around the ends of the outer legs 6 with longitudinal edges 8 bent upwards and inwards and engages with it their longitudinal edges 8 in recesses 9 on the outer legs 6.

Fig. 2 lässt erkennen, wie die E-förmigen Kernbleche 1 und die I-förmigen Rückschlussbleche 2 für die Drossel nach Fig. 1 abfallos aus einem Blechstreifen gewonnen werden. Zur Erzielung des abfallosen Stanzens sind die E-förmigen Kernbleche 1 gegeneinander und auch derart versetzt angeordnet, dass je ein Ende 10 der Aussenschenkel 6 zweier E-förmiger Kernbleche 1 am Ende des Mittelschenkels 3 des gegeneinander gekehrten E-förmigen Kernbleches 1 anliegt. Bei dieser versetzten Anordnung der gegeneinander weisenden E-förmigen Kernbleche 1 fallen durch Ausstanzen der zwischen den Aussenschenkeln 6 und dem Mittelschenkel 3 befindlichen Räume jeweils zwei I-förmige Rückschlussbleche 2 an.FIG. 2 shows how the E-shaped core sheets 1 and the I-shaped backing sheets 2 for the choke according to FIG. 1 are obtained from a sheet metal strip without waste. In order to achieve the waste-free punching, the E-shaped core sheets 1 are arranged in relation to one another and also offset such that one end 10 of the outer legs 6 of two E-shaped core sheets 1 rests against the end of the middle leg 3 of the E-shaped core sheet 1 facing one another. In this offset arrangement of the mutually facing E-shaped core sheets 1, two I-shaped yoke sheets 2 are obtained by punching out the spaces located between the outer legs 6 and the middle leg 3.

Weiterhin ist in Fig. 2 dargestellt, dass die Ausnehmungen 9 an den Aussenschenkeln 6 und die Nut 5 im Mittelschenkel 3, die zur Aufnahme einer Luftspalteinlage 4a dient, als Folge der versetzten Anordnung der E-förmigen Kernbleche 1 nur mit einem einzigen Stempel ausstanzbar sind.Furthermore, it is shown in Fig. 2 that the recesses 9 on the outer legs 6 and the groove 5 in the middle leg 3, which serves to receive an air gap insert 4a, can only be punched out with a single punch as a result of the offset arrangement of the E-shaped core sheets 1 .

Gemäss Fig. 3 weisen zum erleichterten Einführen und vergrösserten Verpressen der I-Pakete zwischen den Aussenschenkeln 6 des E-Paketes die Enden der I-förmigen Rückschlussbleche 2 eine Abschrägung 11 auf, die naturgemäss als Abschrägung 12 an dem E-förmigen Kernblech 1 wiederkehrt, ohne hier jedoch praktisch von Bedeutung zu sein.According to FIG. 3, for easier insertion and enlarged pressing of the I-packets between the outer legs 6 of the E-packet, the ends of the I-shaped yoke plates 2 have a bevel 11, which naturally returns as a bevel 12 on the E-shaped core plate 1, but without being of practical importance here.

Fig. 4 zeigt die Anordnung des E-förmigen Kernbleches 1 und der I-förmigen Rückschlussbleche 2 beim abfallarmen Stanzverfahren. Die Summe der Längen aus dem Mitteischenkei 3 und dem Aussenschenkel 6 des E-förmigen Kernbleches 1 bezogen auf den freien Raum zum Ausstanzen des I-förmigen Rückschlussbleches ist grösser als die Länge des I-förmigen Rückschlussbleches, wodurch der Abfall A an Eisenmaterial zustandekommt.Fig. 4 shows the arrangement of the E-shaped core plate 1 and the I-shaped yoke plates 2 in the low-waste stamping process. The sum of the lengths from the middle part 3 and the outer leg 6 of the E-shaped core plate 1, based on the free space for punching out the I-shaped return plate, is greater than the length of the I-shaped return plate, as a result of which the waste A of iron material occurs.

Claims (8)

1. A method for making E-shaped core plates (1) and I-shaped return plates (2) fitting between the outer legs (6) of the same, for a choke or a transformer, in particular for use as an adapter for gas-discharge lamps, characterized in that two rows of E-shaped core plates (1) are punched with the open sides facing each other and abutting each other in offset arrangement so that the ends (10) of the abutting outer legs (6) of two neighbouring E-shaped core plates (1) abut the end of the middle leg (3) of the opposite offset E-shaped core plate . and that the I-shaped return plates (2) are punched from the clear spaces formed between the outer legs (6) and the middle legs (3) of the E-shaped core plates (1) facing each other.
2. A method in accordance with claim 1, characterized in that when being punched out, the I-shaped return plate (2) is given a length greater than the clear dimension between the outer legs (6) and the E-shaped core plate (1).
3. A method in accordance with claims 1 and 2, characterized in that the ends of the I-shaped return plate (2) are punched with a chamfer (11).
4. A method in accordance with claims 1 to 3, characterized in that the recesses (9) on the outer legs (6) of the E-shaped core plates for receiving a clamping bar (7) are punched with one single die.
5. A method in accordance with claim 4, characterized in that the groove (5) in the middle leg (3) of the E-shaped core plate (1 ) for receiving an air-gap insert (4a) is punched together with the recesse (9) for the clamping bar (7), with one single die.
6. A method in accordance with claims 1 to 3, characterized in that the I-shaped return plate (2) is punched in different widths, depending on the required winding space.
7. A method in accordance with claims 1 to 3 and 6, characterized in that in cases where an air gap is required in the magnetic circuit, the punched length of the middle leg (3) of the E-shaped core plate (1) is reduced by the size of the air gap and the punched length of the outer legs (6) is increased by the size of the air gap.
8. A method in accordance with claims 1 to 3,6 and 7, characterized in that the sum of the lengths of the middle leg (3) and the outer leg (6) of the E-shaped core plate (1), related to the clear space available for punching the I-shaped return plate (2), is greater than the length of the latter.
EP80104497A 1979-08-21 1980-07-30 Process for making e-shaped core laminations and i-shaped yoke laminations for a choke or transformer, particularly for gas discharge lamps Expired EP0024319B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2933781 1979-08-21
DE2933781A DE2933781C2 (en) 1979-08-21 1979-08-21 Process for the production of E-shaped core sheets and I-shaped return yoke sheets for a choke or a transformer, in particular for gas discharge lamps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT80104497T AT3480T (en) 1979-08-21 1980-07-30 METHOD FOR PRODUCING E-SHAPED CORE SHEETS AND I-SHAPED BACK-PLATE SHEETS OF A THROTTLE OR A TRANSFORMER, ESPECIALLY FOR GAS DISCHARGE LAMPS.

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EP0024319A1 EP0024319A1 (en) 1981-03-04
EP0024319B1 true EP0024319B1 (en) 1983-05-18

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EP80104497A Expired EP0024319B1 (en) 1979-08-21 1980-07-30 Process for making e-shaped core laminations and i-shaped yoke laminations for a choke or transformer, particularly for gas discharge lamps

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JP (1) JPS5633809A (en)
AR (1) AR222402A1 (en)
AT (1) AT3480T (en)
AU (1) AU540139B2 (en)
BR (1) BR8005257A (en)
CS (1) CS236771B2 (en)
DD (1) DD153016A5 (en)
DE (1) DE2933781C2 (en)
EG (1) EG13908A (en)
ES (1) ES494405A0 (en)
FI (1) FI71210C (en)
GR (1) GR69693B (en)
HU (1) HU179890B (en)
IN (1) IN152290B (en)
PL (1) PL125117B1 (en)
RO (1) RO83440B (en)
SU (1) SU1083926A3 (en)
UA (1) UA7590A1 (en)
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Also Published As

Publication number Publication date
GR69693B (en) 1982-07-08
AR222402A1 (en) 1981-05-15
JPS5633809A (en) 1981-04-04
AU540139B2 (en) 1984-11-01
FI71210B (en) 1986-08-14
CS236771B2 (en) 1985-05-15
DE2933781C2 (en) 1982-10-07
FI802648A (en) 1981-02-22
FI71210C (en) 1986-11-24
HU179890B (en) 1982-12-28
RO83440B (en) 1984-02-28
UA7590A1 (en) 1995-09-29
PL125117B1 (en) 1983-03-31
PL226317A1 (en) 1981-06-19
EG13908A (en) 1982-12-31
EP0024319A1 (en) 1981-03-04
BR8005257A (en) 1981-03-04
RO83440A (en) 1984-02-21
IN152290B (en) 1983-12-17
YU209280A (en) 1983-06-30
AU6161380A (en) 1981-04-09
ES494405A0 (en) 1981-03-16
AT3480T (en) 1983-06-15
ZA805082B (en) 1981-09-30
YU39881B (en) 1985-04-30
ES8103877A1 (en) 1981-03-16
SU1083926A3 (en) 1984-03-30
DD153016A5 (en) 1981-12-16
DE2933781A1 (en) 1981-03-26

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