EP0510149B1 - Coil former, in particular a coil former for small and safety transformers - Google Patents
Coil former, in particular a coil former for small and safety transformers Download PDFInfo
- Publication number
- EP0510149B1 EP0510149B1 EP91919460A EP91919460A EP0510149B1 EP 0510149 B1 EP0510149 B1 EP 0510149B1 EP 91919460 A EP91919460 A EP 91919460A EP 91919460 A EP91919460 A EP 91919460A EP 0510149 B1 EP0510149 B1 EP 0510149B1
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- Prior art keywords
- shells
- coil former
- transformer
- shaped
- ring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
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- 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
- H01F27/325—Coil bobbins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
- H01F2005/025—Coils wound on non-magnetic supports, e.g. formers wound on coaxial arrangement of two or more formers
Definitions
- the invention relates to a transformer, in particular a small or safety transformer according to the preamble of claim 1, and a method for producing a transformer according to the preamble of claim 5.
- the European standard DIN VDE 0551 part 1 / 09.89 for isolating and safety transformers prescribes for a certain transformer output that coil formers of the type described above, i. H. those that are made from plastic by injection molding must have a wall thickness of at least 1 mm for safety reasons.
- coil formers of the type described above i. H. those that are made from plastic by injection molding must have a wall thickness of at least 1 mm for safety reasons.
- the above-mentioned standard allows the wall thickness of the coil body to be made less than 1 mm, even if the power is the same, if the coil body consists of at least three layers or layers and fulfills the required insulating properties.
- the standard recommends, for example, to manufacture a bobbin by winding a film strip that is feathered or perforated on its two longitudinal edges in four layers on a winding core in such a way that the feathered or perforated edge areas bend upwards, thereby creating a U-profile in cross section with side edge flanges for the bobbin. Due to the edge incisions (feathering) or perforation in the edge area, however, there are air gaps in every layer, ie places of reduced insulation. These are the reason why - how Tests have shown - coil bodies produced in this way sometimes do not meet the required insulating properties.
- DE-A-31 07 059 describes a coil former which is made from a multi-layer insulating tape winding and also has a U-profile in cross section.
- the three or more layers of insulating tape winding can be deformed by plastic deformation of its ends and then applied to the primary winding.
- the invention has for its object to provide a transformer with a standard-compliant bobbin, which has a much smaller wall thickness than 1 mm and ensures perfect insulation values especially in the area of the U-legs.
- the outer coil body of the transformer according to the invention consists of several shells, the standard is satisfied.
- the wall thickness of the shells can be chosen so that the total thickness of the shells lying one above the other is considerably less than 1 mm.
- the dimensional stability on the one hand and the plastic deformability on the other hand ensure that the shells can be joined together to form the annular coil former.
- Each of the shells has only one break in its circumference.
- Shells of the same type are preferably used for a coil former. However, this is not absolutely necessary.
- Another expedient development can consist in that a metal foil, preferably a copper foil, is inserted between at least two shells. In this way, electrical shielding of the windings lying one above the other can be ensured.
- the shells are designed in such a way that the ends formed by the interruption overlap in the assembled state of the coil former.
- the shells or partial shells can consist of thermoplastic material, which enables production by plastic deformation.
- annular shells when using annular shells, these can be opened one after the other by plastic bending at the interruptions and pushed over one another. This can be done in such a way that the interruptions all come to lie at the same point on the coil former or alternately at opposite points.
- a film material with a wall thickness of less than 100 microns, z. B. 80 microns are used, so that there is a very thin wall for the bobbin and therefore more space is available for the winding.
- a three-layer coil former for example, a total wall thickness of less than 300 ⁇ m can be achieved.
- This bobbin has the advantage over the bobbin produced by winding from foil tape that is recommended by the standard that gaps in the insulation are excluded.
- FIG. 1 shows a transformer 1 with an iron core 2, a first winding 3 and a second winding 4.
- the first winding 3 is wound on an inner coil former 5A, which encloses an opening 10 through which a leg 6 of the transformer core extends.
- the second winding 4 is located on an outer coil body 5B, which is arranged on the first winding 3. With 7 the winding axis of the two windings 3, 4 is designated.
- Figure 2 shows the inner coil body 5A with the winding 3 in a perspective view.
- this inner coil former 5A is designed as described below in connection with the outer coil former 5B.
- the outer coil body 5B consists of two partial bodies 5Ba and 5Bb.
- the two partial bodies each consist of several partial shells, of which only two are shown in FIG. 2.
- the partial shells 5Ba1 and 5Ba2 form the partial body 5Ba.
- the partial shells 5Bb1 and 5Bb2 form the partial body 5Bb.
- Each of the partial shells consists of a thermoplastic deformable film with a U-shaped cross section, the web of the U-profile being designated 9 and the edge flanges 11.
- the partial shells 5Ba1 and 5Ba2 are pushed on top of one another to form the partial body 5Ba.
- the partial shells 5Bb1 and 5Bb2 are pushed over one another to form the partial body 5Bb.
- the two partial bodies 5Ba and 5Bb then become the formation of the outer bobbin 5B is pushed onto the inner bobbin 5A in such a way that the ends meeting one another overlap.
- FIG. 3 shows a coil former 5 which is constructed in the same way as the coil former 5A and 5B in FIGS. 1 and 2.
- the bobbin 5 here consists of two C-shaped partial bodies 5a and 5b, which are set against one another at their ends 15, in such a way that they overlap in an overlap region U.
- the partial body 5a consists of three partial shells 5a1, 5a2 and 5a3 arranged in a box shape.
- the part body 5b consists of three box-shaped part shells 5b1, 5b2 and 5b3 arranged one inside the other.
- Each of the partial shells in turn has a U-profile and consists of a thermoplastic deformable film.
- the coil former 5 has two interruptions 18 as a result of the C-shaped partial bodies 5a, 5b placed against one another.
- FIG. 4 shows a coil former 5C which has only one interruption 18. It consists of three annular shells 5c1, 5c2 and 5c3 arranged one above the other in layers or one inside the other like boxes. Each of the shells has a U-profile in cross-section and consists of a thermoplastic plastic film. The shells are inherently stable, but plastically deformable. In particular, they can be bent open by moving their ends 15 away from one another. In the shape opened in this way, they can be put over the other shells and nested. As can be seen from FIG. 4, the ends 15 of the shells are alternately plugged together and form an overlap area Ü.
- a metal foil in particular a copper foil, can also be inserted between the shells or partial shells of all embodiments, in order thereby to provide a shield for the windings from other windings or from the iron core.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulating Of Coils (AREA)
- Details Of Television Scanning (AREA)
- Coils Or Transformers For Communication (AREA)
- Coils Of Transformers For General Uses (AREA)
- Regulation Of General Use Transformers (AREA)
- Fuses (AREA)
Abstract
Description
Die Erfindung betrifft einen Transformator, insbesondere einen Klein- oder Sicherheitstransformator gemäß Oberbegriff des Anspruches 1, sowie ein Verfahren zur Herstellung eines Transformators gemäß Oberbegriff des Anspruchs 5.The invention relates to a transformer, in particular a small or safety transformer according to the preamble of claim 1, and a method for producing a transformer according to the preamble of claim 5.
Nach der DE-A 22 08 457 ist es bekannt, eine erste Wicklung eines Transformators auf einen durch Spritzgießen aus Kunststoff hergestellten Spulenkörper zu wickeln, der einen Hohlraum für einen Transformatorschenkel einschließt und an seinen Enden mit Rückhalteflanschen für die Wicklung versehen ist. Um eine auf die erste Wicklung aufzubringende zweite Wicklung von der ersten Wicklung zu isolieren, ist ein dazwischen anzuordnender zweiter Spulenkörper vorgesehen, der ebenfalls durch Spritzgießen aus Kunststoff hergestellt ist. Dieser zweite Spulenkörper ist zweiteilig. Jedes seiner beiden Teile hat - in Richtung der Spulenachse gesehen - C-Form. Die beiden C-förmigen Teile werden auf die erste Wicklung geschoben, so daß sich ihre Enden überlappen. Auch die beiden C-förmigen Teile des zweiten Spulenkörpers haben an ihren Enden Rückhalteflansche für die auf Ihnen aufgewickelte zweite Wicklung.According to DE-A 22 08 457, it is known to wind a first winding of a transformer on a coil body produced by injection molding from plastic, which includes a cavity for a transformer leg and is provided at its ends with retaining flanges for the winding. In order to isolate a second winding to be applied to the first winding from the first winding, a second coil former to be arranged between them is provided, which is also produced from plastic by injection molding. This second coil body is in two parts. Each of its two parts has a C shape when viewed in the direction of the coil axis. The two C-shaped parts are pushed onto the first winding so that their ends overlap. The ends of the two C-shaped parts of the second coil body also have retaining flanges for the second winding wound on them.
Die Europa-Norm DIN VDE 0551 Teil 1/09.89 für Trenn- und Sicherheitstransformatoren schreibt für eine bestimmte Transformatorleistung vor, daß Spulenkörper der vorstehend beschriebenen Art, d. h. solche, die durch Spritzgießen aus Kunststoff hergestellt werden, aus Sicherheitsgründen eine Wanddicke von mindestens 1 mm haben müssen. Bei kleinen Transformatoren und Spulen, wie sie z. B für elektrische Geräte, wie Leuchten (insbesondere Halogenlampen), Spielzeuge, Rasierapparate, u.s.w. eingesetzt werden, ist jedoch eine solche Wanddicke unerwünscht, da sie der hier bestehenden Forderung nach Baugrößen-Minimierung entgegensteht.The European standard DIN VDE 0551 part 1 / 09.89 for isolating and safety transformers prescribes for a certain transformer output that coil formers of the type described above, i. H. those that are made from plastic by injection molding must have a wall thickness of at least 1 mm for safety reasons. For small transformers and coils, such as those used for. B for electrical devices, such as lights (especially halogen lamps), toys, shavers, etc. such a wall thickness is undesirable, since it runs counter to the existing requirement for minimizing size.
Die oben erwähnte Norm erlaubt es auch bei gleicher Leistung, die Wanddicke des Spulenkörpers geringer als 1 mm zu machen, wenn der Spulenkörper aus rnindestens drei Schichten bzw. Lagen besteht und die geforderten Isoliereigenschaften erfüllt. Die Norm empfiehlt beispielsweise einen Spulenkörper dadurch herzustellen, daß ein an seinen beiden längsrändern gefiedertes oder perforiertes Folienband in vier Lagen auf einen Wickelkern gewickelt wird, derart, daß sich die gefiederten bzw. perforierten Randbereiche nach oben biegen, wodurch sich im Querschnitt ein U-Profil mit seitlichen Randflanschen für den Spulenkörper ergibt. Aufgrund der Randeinschnitte (Fiederung) bzw. Perforation im Randbereich ergeben sich jedoch in jeder Lage Luftspalte, d. h. Stellen verminderter Isolation. Diese sind die Ursache dafür, daß - wie Versuche ergeben haben - so hergestellte Spulenkörper die geforderten Isoliereigenschaften bisweilen nicht erfüllen.The above-mentioned standard allows the wall thickness of the coil body to be made less than 1 mm, even if the power is the same, if the coil body consists of at least three layers or layers and fulfills the required insulating properties. The standard recommends, for example, to manufacture a bobbin by winding a film strip that is feathered or perforated on its two longitudinal edges in four layers on a winding core in such a way that the feathered or perforated edge areas bend upwards, thereby creating a U-profile in cross section with side edge flanges for the bobbin. Due to the edge incisions (feathering) or perforation in the edge area, however, there are air gaps in every layer, ie places of reduced insulation. These are the reason why - how Tests have shown - coil bodies produced in this way sometimes do not meet the required insulating properties.
Die DE-A-31 07 059 beschreibt einen Spulenkörper, der aus einem mehrlagigen Isolierbandwickel hergestellt ist und ebenfalls im Querschnitt U-Profil hat.DE-A-31 07 059 describes a coil former which is made from a multi-layer insulating tape winding and also has a U-profile in cross section.
Der drei - oder mehrlagig gewickelte Isolierbandwickel kann durch plastische Verformung seiner Enden umgeformt und anschließend auf die Primärwicklung aufgebracht werden.The three or more layers of insulating tape winding can be deformed by plastic deformation of its ends and then applied to the primary winding.
Der Erfindung liegt die Aufgabe zugrunde, einen Transformator mit einem normgerechten Spulenkörper zu schaffen, der eine wesentlich geringere Wandstärke als 1 mm aufweist und vor allem im Bereich der U-Schenkel einwandfrei Isolationswerte gewährleistet.The invention has for its object to provide a transformer with a standard-compliant bobbin, which has a much smaller wall thickness than 1 mm and ensures perfect insulation values especially in the area of the U-legs.
Die Aufgabe ist erfindungsgemäß durch die Merkmale des Anspruchs 1 bzw. 5 gelöst.The object is achieved by the features of claims 1 and 5, respectively.
Dadurch, daß der äußere Spulenkörper des erfindungsgemäßen Transformators aus mehreren Schalen besteht, wird der Norm genüge getan. Die Wanddicke der Schalen kann so gewählt werden, daß die Gesamtdicke der übereinanderliegenden Schalen erheblich unter 1 mm liegt.The fact that the outer coil body of the transformer according to the invention consists of several shells, the standard is satisfied. The wall thickness of the shells can be chosen so that the total thickness of the shells lying one above the other is considerably less than 1 mm.
Die Formstabilität einerseits und die plastische Verformbarkeit andererseits gewährleisten, daß die Schalen zu dem ringförmigen Spulenkörper zusammengefügt werden können. Jede der Schalen weist lediglich eine Unterbrechung an ihrem Umfang auf.The dimensional stability on the one hand and the plastic deformability on the other hand ensure that the shells can be joined together to form the annular coil former. Each of the shells has only one break in its circumference.
Vorzugsweise werden für einen Spulenkörper gleichartige Schalen verwendet. Dies ist jedoch nicht zwingend notwendig.Shells of the same type are preferably used for a coil former. However, this is not absolutely necessary.
Eine andere zweckmäßige Weiterbildung kann darin bestehen, daß zwischen mindestens zwei Schalen eine Metallfolie, vorzugsweise eine Kupferfolie eingelegt ist. Auf diese Weise kann eine elektrische Abschirmung der übereinanderliegenden Wicklungen gewährleistet werden. Um eine Luftspaltbildung zu vermeiden sind die Schalen so ausgebildet, daß sich die durch die Unterbrechung gebildeten Enden im zusammengesetzten Zustand des Spulenkörpers überlappen.Another expedient development can consist in that a metal foil, preferably a copper foil, is inserted between at least two shells. In this way, electrical shielding of the windings lying one above the other can be ensured. In order to avoid the formation of an air gap, the shells are designed in such a way that the ends formed by the interruption overlap in the assembled state of the coil former.
Die Schalen oder Teilschalen können aus thermoplastischem Material bestehen, welches ein Herstellen durch plastisches Verformen ermöglicht.The shells or partial shells can consist of thermoplastic material, which enables production by plastic deformation.
Das erfindungsgemäße Verfahren zur Herstellung eines Transformators wird durch die Merkmale des Anspruches 5 beschrieben.The inventive method for producing a transformer is described by the features of claim 5.
So besteht eine Möglichkeit zur Herstellung eines Spulenkörpers des Transformators darin, daß aus einem ebenen Folienband durch plastisches Verformen gerade U-Profile hergestellt werden, daß aus den U-Profilen durch plastisches Verformen ringförmige Schalen oder C-förmige Teilschalen hergestellt werden, und daß aus den ringförmigen Schalen oder C-förmigen Teilschalen dann, gegebenenfalls unter Dazwischenlegen einer Metallfolie, insbesondere einer Kupferfolie, der Spulenkörper zusammengesetzt wird.So there is a possibility for producing a coil former of the transformer that straight U-profiles are produced from a flat foil strip by plastic deformation, that ring-shaped shells or C-shaped partial shells are produced from the U-profiles by plastic deformation, and that from the ring-shaped shells or C-shaped partial shells then, optionally with the interposition of a metal foil, in particular a copper foil, the coil former is assembled.
Es ist auch möglich, daß gleichzeitig mehrere U-Profile und daraus mehrere ringförmige Schalen oder C-förmige Teil schalen aus mehreren übereinanderliegenden ebenen Folienbändern in einem Arbeitsgang durch plastisches Verformen hergestellt werden.It is also possible that at the same time several U-profiles and therefrom several ring-shaped shells or C-shaped part shells are produced from several superimposed flat foil strips in one operation by plastic deformation.
Alternativ zu der letztgenannten Möglichkeit können bei Verwendung von ringförmigen Schalen diese nacheinander durch plastisches Aufbiegen an den Unterbrechungen geöffnet und übereinandergeschoben werden. Dies kann dabei so erfolgen, daß die Unterbrechungen alle an der gleichen Stelle des Spulenkörpers zu liegen kommen oder aber wechselweise an gegenüberliegenden Stellen.As an alternative to the latter possibility, when using annular shells, these can be opened one after the other by plastic bending at the interruptions and pushed over one another. This can be done in such a way that the interruptions all come to lie at the same point on the coil former or alternately at opposite points.
Über das erfindungsgemäße Verfahren kann ein Folienmaterial mit einer Wanddicke von weniger als 100 µm, z. B. 80 µm verwendet werden, so daß sich eine sehr dünne Wandung für den Spulenkörper ergibt und deshalb mehr Raum für die Wicklung zur Verfügung steht. Bei einem dreilagigen Spulenkörper läßt sich somit beispielsweise eine Gesamtwanddicke von weniger als 300 µm erreichen. Dieser Spulenkörper hat gegenüber dem von der Norm empfohlenen durch Wickeln aus Folienband hergestellten Spulenkörper den Vorteil, daß Lücken in der Isolation ausgeschlossen sind.A film material with a wall thickness of less than 100 microns, z. B. 80 microns are used, so that there is a very thin wall for the bobbin and therefore more space is available for the winding. With a three-layer coil former, for example, a total wall thickness of less than 300 μm can be achieved. This bobbin has the advantage over the bobbin produced by winding from foil tape that is recommended by the standard that gaps in the insulation are excluded.
Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnungen beschrieben.Embodiments of the invention are described below with reference to the drawings.
Es zeigen:
- Figur 1 einen Transformator mit zwei auf Spulenkörpern gewickelten übereinanderliegenden Wicklungen;
- Figur 2 eine perspektivische Darstellung des inneren Spulenkörpers aus Figur 1 mit darauf befindlicher Wicklung sowie einer Explosionsdarstellung des äußeren Spulenkörpers ohne Wicklung;
Figur 3 eine erste Ausführungsform des Spulenkörpers des erfindungsgemäßen Transformators in Seitenansicht;Figur 4 eine zweite Ausführungsform des des erfindungsgemäßen Transformators Spulenkörpers in Seitenansicht.
- 1 shows a transformer with two windings lying one above the other on bobbins;
- Figure 2 is a perspective view of the inner bobbin from Figure 1 with the winding thereon and an exploded view of the outer bobbin without winding;
- Figure 3 shows a first embodiment of the coil body of the transformer according to the invention in side view;
- Figure 4 shows a second embodiment of the transformer bobbin according to the invention in side view.
Figur 1 zeigt einen Transformator 1 mit einem Eisenkern 2, einer ersten Wicklung 3 und einer zweiten Wicklung 4. Die erste Wicklung3 ist auf einen inneren Spulenkörper 5A aufgewickelt, der eine Öffnung 10 umschließt, durch die sich ein Schenkel 6 des Transformatorkernes erstreckt. Die zweite Wicklung 4 befindet sich auf einem äußeren Spulenkörper 5B, der auf der ersten Wicklung 3 angeordnet ist. Mit 7 ist die Wickelachse der beiden Wicklungen 3, 4 bezeichnet.FIG. 1 shows a transformer 1 with an iron core 2, a first winding 3 and a second winding 4. The
Figur 2 zeigt den inneren Spulenkörper 5A mit der Wicklung 3 in perspektivischer Darstellung. Dieser innere Spulenkörper 5A ist hinsichtlich seines Aufbaus so ausgebildet, wie dies nachfolgend im Zusammenhang mit dem äußeren Spulenkörper 5B beschrieben wird.Figure 2 shows the
Der äußere Spulenkörper 5B besteht gemäß Figur 2 aus zwei Teilkörpern 5Ba und 5Bb. Die beiden Teilkörper bestehen ihrerseits jeweils aus mehreren Teilschalen, von denen in Figur 2 jeweils nur zwei dargestellt sind. Die Teilschalen 5Ba1 und 5Ba2 bilden den Teilkörper 5Ba. Die Teilschalen 5Bb1 und 5Bb2 bilden den Teilkörper 5Bb.According to FIG. 2, the
Jede der Teilschalen besteht aus einer im Querschnitt U-förmigen thermoplastisch verformbaren Folie, wobei der Steg des U-Profils mit 9 und die Randflansche mit 11 bezeichnet sind. Wie die Pfeile andeuten, werden die Teilschalen 5Ba1 und 5Ba2 einerseits zur Bildung des Teilkörpers 5Ba übereinandergeschoben. In gleicher Weise werden die Teilschalen 5Bb1 und 5Bb2 zur Bildung des Teilkörpers 5Bb übereinandergeschoben. Die beiden Teilkörper 5Ba und 5Bb werden dann zur Bildung des äußeren Spulenkörpers 5B auf den inneren Spulenkörper 5A aufgeschoben, derart, daß sich die aufeinandertreffenden Enden überlappen.Each of the partial shells consists of a thermoplastic deformable film with a U-shaped cross section, the web of the U-profile being designated 9 and the
In Figur 3 ist ein Spulenkörper 5 gezeigt, der in gleicher Weise wie die Spulenkörper 5A und 5B in den Figuren 1 und 2 aufgebaut ist. Der Spulenkörper 5 besteht hier aus zwei C-förmigen Teilkörpern 5a und 5b, die mit ihren Enden 15 gegeneinander gesetzt sind, derart, daß sie sich in einem Überlappungsbereich Ü überlappen. Der Teilkörper 5a besteht aus drei schachtelförmig ineinander angeordneten Teilschalen 5a1, 5a2 und 5a3. Der Teilkörper 5b besteht aus drei schachtelförmig ineinander angeordneten Teilschalen 5b1, 5b2 und 5b3. Jede der Teilschalen hat wiederum U-Profil und besteht aus einer thermoplastisch verformbaren Folie. Der Spulenkörper 5 hat infolge der gegeneinander gesetzten C-förmigen Teilkörper 5a, 5b zwei Unterbrechungen 18.FIG. 3 shows a coil former 5 which is constructed in the same way as the coil former 5A and 5B in FIGS. 1 and 2. The bobbin 5 here consists of two C-shaped
Figur 4 zeigt einen Spulenkörper 5C, der nur eine Unterbrechung 18 hat. Er besteht aus drei schichtartig übereinander angeordneten bzw. schachtelartig ineinander angeordneten ringförmigen Schalen 5c1, 5c2 und 5c3. Jede der Schalen hat im Querschnitt U-Profil und besteht aus einer thermoplastisch verformbaren Kunststoffolie. Die Schalen sind in sich formstabil, jedoch plastisch verformbar. Insbesondere können sie aufgebogen werden, indem ihre Enden 15 voneinander wegbewegt werden. In der so geöffneten Form können sie über die anderen Schalen gestülpt und ineinander verschachtelt werden. Wie man der Figur 4 entnehmen kann, sind die Enden 15 der Schalen wechselweise zusammengesteckt und bilden einen Überlappungsbereich Ü.FIG. 4 shows a coil former 5C which has only one
Zwischen den Schalen bzw. Teilschalen aller Ausführungsformen kann noch eine Metallfolie, insbesondere eine Kupferfolie eingelegt werden, um dadurch eine Abschirmung für die Wicklungen gegenüber anderen Wicklungen oder gegenüber dem Eisenkern zu schaffen.A metal foil, in particular a copper foil, can also be inserted between the shells or partial shells of all embodiments, in order thereby to provide a shield for the windings from other windings or from the iron core.
Claims (8)
- Transformer, in particular miniature or safety transformer,
having an inner and an outer coil former (5A, 5B), configured to be ring-shaped, of electrically insulating material, which at a sectional plane containing the ring axis (7) have an approximately U-shaped cross-section, the U-limbs (11) of the coil formers (5A, 5B) pointing away from the ring axis (7) and forming edge flanges for a transformer winding, the inner coil former (5A) surrounding a cavity (10) for receiving a core limb (6), and the outer coil former (5B) being dimensionally stable and elastically deformable under stress and having an interruption (18) at at least one position on its circumference, the ends (15) formed by the interruption (18) overlapping, and
having a first transformer winding (3) wound on the inner coil former (5A) and a second transformer winding (4) wound on the outer coil former (5B), the first transformer winding (3) being electrically insulated from the second transformer winding (4) by the outer coil former (5B),
characterised in that,
the outer coil former consists of at least two ring-like shells (5Ba1, 5Ba2, 5Bb1, 5Bb2, 5a1, 5a2, 5a3, 5b1, 5b2, 5b3, 5c1, 5c2, 5c3) superimposed over one another in a layered fashion, of which each is in itself dimensionally stable and elastically deformable under stress, e.g. by bending apart, and has only one interruption (18) at its circumference. - Transformer according to claim 1, characterised in that the shells (5Ba1, 5Ba2, 5Bb1, 5Bb2, 5a1, 5a2, 5a3, 5b1, 5b2, 5b3, 5c1, 5c2, 5c3) are similar.
- Transformer according to claim 1 or 2, characterised in that a metal foil, preferably a copper foil, is inserted between at least two shells.
- Transformer according to any preceding claim, characterised in that the shells are of thermoplastic material.
- Process for manufacturing a transformer, in particular a miniature or safety transformer,
a first transformer winding (3) being wound on an inner coil former (5A) of electrically insulating material and surrounding a cavity for receiving a core limb (6), an outer coil former (5B) being placed on the first transformer winding (3) and a second transformer winding (4) being wound on the outer coil former (5B), the first transformer winding (3) being electrically insulated from the second transformer winding (4) by means of the outer coil former (5B), and the outer coil former (5B) having at a sectional plane containing the ring axis (7) an approximately U-shaped cross-section, the U-limbs (11) pointing away from the ring axis (7) and forming edge flanges for the winding,
characterised in that,
U-sections are made from a flat strip of foil by plastic forming,
in that ring-shaped shells (5c, 5c1, 5c2, 5c3) or C-shaped part-shells (5Aa, 5Ab, 5Ba1, 5Ba2, 5Bb1, 5Bb2) are made from the U-sections by plastic forming, each being in itself dimensionally stable in the absence of stress and elastically deformable under stress,
in that the outer coil former is assembled from the ring-shaped shells (5c, 5c1, 5c2, 5c3) or C-shaped part-shells (5Aa, 5Ab, 5Ba1, 5Ba2, 5Bb1, 5Bb2), at least two ring-shaped shells (5c1, 5c2, 5c3) being pushed over one another or at least two C-shaped part-shells (5Aa, 5Ab, 5a1, 5b1) being pushed together so that their ends (15) overlap, and then at least two further C-shaped part-shells (5Ba1, 5Bb1, 5Ba2, 5Bb2, 5a2, 5b2, 5a3, 5b3) being pushed over the first C-shaped part-shells (5Aa, 5Ab, 5a1, 5b1) so that their ends also overlap, and
in that the shells or part-shells of the outer coil former (5B) are pushed over the first transformer winding (3). - A process according to claim 5, characterised in that a plurality of U-sections, and therefrom a plurality of ring-shaped shells or C-shaped part-shells are simultaneously made from a plurality of superimposed flat strips of foil by plastic forming in a single process step.
- A process according to claim 6, characterised in that when ring-shaped shells are used these are successively opened by elastic bending apart at the interruptions and pushed over one another.
- A process according to claim 7, characterised in that the ring-shaped shells are successively pushed over one another in such a way that the interruptions come to lie alternately at opposite positions of the outer coil former.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4036275 | 1990-11-14 | ||
DE4036275A DE4036275A1 (en) | 1990-11-14 | 1990-11-14 | RING SHAPED BOBBIN FOR SMALL AND SAFETY TRANSFORMERS AND METHOD FOR THE PRODUCTION THEREOF |
PCT/EP1991/002144 WO1992009092A1 (en) | 1990-11-14 | 1991-11-13 | Coil former, in particular a coil former for small and safety transformers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0510149A1 EP0510149A1 (en) | 1992-10-28 |
EP0510149B1 true EP0510149B1 (en) | 1996-01-31 |
Family
ID=6418259
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91919460A Expired - Lifetime EP0510149B1 (en) | 1990-11-14 | 1991-11-13 | Coil former, in particular a coil former for small and safety transformers |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0510149B1 (en) |
JP (1) | JPH05505910A (en) |
AT (1) | ATE133811T1 (en) |
AU (1) | AU650301B2 (en) |
DE (2) | DE4036275A1 (en) |
ES (1) | ES2084835T3 (en) |
WO (1) | WO1992009092A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005007334B4 (en) * | 2005-02-17 | 2007-02-08 | Siemens Ag | Summation current transformer for the universal current-sensitive detection of an electrical differential current |
US9985488B2 (en) | 2011-07-22 | 2018-05-29 | RWXT Nuclear Operations Group, Inc. | Environmentally robust electromagnets and electric motors employing same for use in nuclear reactors |
DE202013104681U1 (en) * | 2013-10-16 | 2013-11-27 | Vallon Gmbh | degaussing |
DE102014202531A1 (en) * | 2014-02-12 | 2015-08-13 | Siemens Aktiengesellschaft | A high voltage transformer device with adjustable dispersion, inverter circuit with a high voltage transformer device and use of a high voltage transformer device |
CN106252031B (en) | 2015-06-12 | 2020-08-04 | 松下知识产权经营株式会社 | Magnetic device and power conversion apparatus using the same |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB250261A (en) * | 1925-04-02 | 1926-08-12 | Gen Electric | Improvements in or relating to electric transformers |
US2167539A (en) * | 1937-12-28 | 1939-07-25 | Gen Electric | Method of making flanged cylinders |
US2723933A (en) * | 1950-01-31 | 1955-11-15 | Hans D Isenberg | Method of making preformed insulation for high voltage transformer |
GB739762A (en) * | 1953-04-03 | 1955-11-02 | Forges Ateliers Const Electr | Improvements in high-tension transformer windings |
DE2208457A1 (en) * | 1972-02-23 | 1973-08-30 | Loewe Opta Gmbh | REEL FOR TRANSFORMERS |
GB1495783A (en) * | 1975-02-10 | 1977-12-21 | Stroemberg Oy Ab | Voltage transformer |
DE3107059A1 (en) * | 1981-02-25 | 1982-09-09 | Siemens AG, 1000 Berlin und 8000 München | Electrical transformer |
-
1990
- 1990-11-14 DE DE4036275A patent/DE4036275A1/en not_active Withdrawn
-
1991
- 1991-11-13 DE DE59107357T patent/DE59107357D1/en not_active Expired - Fee Related
- 1991-11-13 AT AT91919460T patent/ATE133811T1/en not_active IP Right Cessation
- 1991-11-13 ES ES91919460T patent/ES2084835T3/en not_active Expired - Lifetime
- 1991-11-13 EP EP91919460A patent/EP0510149B1/en not_active Expired - Lifetime
- 1991-11-13 WO PCT/EP1991/002144 patent/WO1992009092A1/en active IP Right Grant
- 1991-11-13 AU AU88622/91A patent/AU650301B2/en not_active Expired
- 1991-11-13 JP JP91517383A patent/JPH05505910A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE59107357D1 (en) | 1996-03-14 |
JPH05505910A (en) | 1993-08-26 |
ES2084835T3 (en) | 1996-05-16 |
WO1992009092A1 (en) | 1992-05-29 |
ATE133811T1 (en) | 1996-02-15 |
AU650301B2 (en) | 1994-06-16 |
EP0510149A1 (en) | 1992-10-28 |
DE4036275A1 (en) | 1992-05-21 |
AU8862291A (en) | 1992-06-11 |
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