EP0953995A1 - Ignition coil with rod-shaped core - Google Patents

Ignition coil with rod-shaped core Download PDF

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Publication number
EP0953995A1
EP0953995A1 EP99100426A EP99100426A EP0953995A1 EP 0953995 A1 EP0953995 A1 EP 0953995A1 EP 99100426 A EP99100426 A EP 99100426A EP 99100426 A EP99100426 A EP 99100426A EP 0953995 A1 EP0953995 A1 EP 0953995A1
Authority
EP
European Patent Office
Prior art keywords
core
coil
rod
material removal
coil according
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.)
Ceased
Application number
EP99100426A
Other languages
German (de)
French (fr)
Inventor
Bernhard Just
Karl-Heinz Nuebel
Werner Schmidt
Reinhard Seidl
Lothar Detels
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0953995A1 publication Critical patent/EP0953995A1/en
Ceased legal-status Critical Current

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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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines

Definitions

  • the invention is based on a rod coil for ignition systems, especially as an ignition coil in internal combustion engines from Motor vehicles according to the preamble of claim 1.
  • a rod coil is known from EP 0 785 605 A1 a centrally arranged core made of magnetizable Has material. To avoid eddy current losses when the rod coil is operated, the core is made of one another electrically insulated sheet metal laminates. There Rod coils in the basic form a circular cross-sectional shape the core must consist of many different widths Sheet metal fins are built up so that this in cross section at least approximately the basic shape of the rod coil is adjusted.
  • the core In order to apply an electrical winding to such a core, the core must either be overmolded or in a sleeve be pushed so that the cross-section is stepped arranged sharp edges of the metal fins the insulation the wire of the neighboring electrical winding cut through and cause a short circuit in this.
  • the rod coil according to the invention for ignition systems with the characteristic features of claim 1 has in contrast the advantage that the aforementioned shortcomings be avoided.
  • the core of the rod coil is designed so that it is up to has a round cross-sectional area on flattened areas. This allows a first winding of the bar coil directly onto the Iron core applied and so the winding volume of the rod coil be created on a large volume, making a large one electrical performance of the rod coil can be achieved.
  • FIG. 2 is in a cross section along the line II-II of Figure 1 and rotated by 90 ° the core with the primary bobbin and the housing is shown.
  • Rod coil 11 for ignition systems is particularly used as an ignition coil in internal combustion engines of motor vehicles in no closer shown way for direct contact with a Spark plug provided in a shaft in the cylinder head an internal combustion engine is used.
  • the rod coil 11 contains a coaxial arrangement Longitudinal axis 12 in one in the basic form hollow cylindrical housing 13 made of plastic in a central Location an elongated core 14, also called an I-core referred to as.
  • the core 14 is, as from FIG. 2 evident from a variety of contiguous, too mutually electrically insulated slats 16 made of sheet iron composed.
  • the Width of the individual slats 16 is in their manufacture through a punching process slightly larger than the corresponding one Width of the later cross-sectional area of the core 14, which, as can be seen from FIG. 2, by an enveloping circle 21 is limited, with in the area of the slats 18, 19th Flattenings 20 are formed.
  • the Projections of the fins 16 with respect to the enveloping circle 21 away are preferably carried out by milling or grinding with a tool.
  • the machining direction runs parallel to the longitudinal axis 12 around a lamella 16 to avoid bridging burrs.
  • it can Process for material removal also via laser processing respectively.
  • the machined core 14 has a primary bobbin 22 molded from plastic.
  • the primary coil former 22 has two spaced apart, radially directed flanges 23, 24, each at one end of the rod-shaped core 14 are attached. There is a between the flanges 23, 24 Changing room 26 formed.
  • the flanges 23, 24 are through connectors 27, 28, the bridge the changing room 26 and one each have segmental cross-sectional area with each other connected.
  • the connecting pieces 27, 28 each lie with a flat bottom surface 29 on an outer top surface 31 on the associated lamella 18, 19 and supplement each with an arcuate lateral surface 32 in the 2 shows the enveloping circle 21 in the area of the slats 18, 19.
  • One of the connecting pieces 27, 28 can have a groove 33 for Guide a wire with which the winding space 26th is wound in layers to form a primary winding.
  • the groove 33 is required if an odd one Number of layers at the beginning and end of the winding Connection means summarized on one of the flanges 23, 24 should be.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

The coil (11) has a central longitudinal core (14) assembled from a series of laminations (16), forming part of an open magnetic circuit. The outside of the core is defined by a cylindrical surface (21) with flat surfaces (20) at top and bottom of the stacked laminations, receiving coupling pieces (27,28) for securing the laminations. An Independent claim for method of manufacture of a rod coil for an ignition device is also included.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Stabspule für Zündanlagen, insbesondere als Zündspule in Brennkraftmaschinen von Kraftfahrzeugen nach der Gattung des Anspruchs 1.The invention is based on a rod coil for ignition systems, especially as an ignition coil in internal combustion engines from Motor vehicles according to the preamble of claim 1.

Durch die EP 0 785 605 A1 ist eine Stabspule bekannt, die einen zentral angeordneten Kern aus magnetisierbarem Material aufweist. Zur Vermeidung von Wirbelstromverlusten beim Betrieb der Stabspule ist der Kern aus zueinander elektrisch isolierten Blechlamellen zusammengesetzt. Da Stabspulen in der Grundform eine kreisrunde Querschnittsform haben, muß der Kern aus vielen verschieden breiten Blechlamellen aufgebaut werden, damit dieser im Querschnitt zumindest näherungsweise der Grundform der Stabspule angepaßt ist.A rod coil is known from EP 0 785 605 A1 a centrally arranged core made of magnetizable Has material. To avoid eddy current losses when the rod coil is operated, the core is made of one another electrically insulated sheet metal laminates. There Rod coils in the basic form a circular cross-sectional shape the core must consist of many different widths Sheet metal fins are built up so that this in cross section at least approximately the basic shape of the rod coil is adjusted.

Um auf einen solchen Kern eine elektrische Wicklung aufzubringen, muß der Kern entweder umspritzt oder in eine Hülse geschoben werden, damit die im Querschnitt stufenförmig angeordneten scharfen Kanten der Blechlamellen die Isolation des Drahtes der benachbarten elektrischen Wicklung nicht durchschneiden und in dieser einen Kurzschluß hervorrufen. In order to apply an electrical winding to such a core, the core must either be overmolded or in a sleeve be pushed so that the cross-section is stepped arranged sharp edges of the metal fins the insulation the wire of the neighboring electrical winding cut through and cause a short circuit in this.

Durch die Umspritzung des Kerns oder die Ummantelung des Kerns mit einer Hülse wird in unerwünschter Weise der verbleibende Einbauraum in der Stabspule eingeengt, so daß das Wickelvolumen der Stabspule nicht großvolumig ausgeführt werden kann und die elektrische Leistung der Stabspule gering bleibt.By overmolding the core or sheathing the Core with a sleeve is undesirable remaining installation space in the rod coil is narrowed so that the winding volume of the rod coil is not large and the electrical power of the bar coil remains low.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Stabspule für Zündanlagen mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß die zuvor erwähnten Unzulänglichkeiten vermieden werden.The rod coil according to the invention for ignition systems with the characteristic features of claim 1 has in contrast the advantage that the aforementioned shortcomings be avoided.

Dazu ist der Kern der Stabspule so ausgebildet, daß er bis auf Abflachungen eine runde Querschnittsfläche aufweist. Damit kann eine erste Wicklung der Stabspule direkt auf den Eisenkern aufgebracht und so das Wickelvolumen der Stabspule großvolumig angelegt werden, womit sich eine große elektrische Leistung der Stabspule erzielen läßt.For this purpose, the core of the rod coil is designed so that it is up to has a round cross-sectional area on flattened areas. This allows a first winding of the bar coil directly onto the Iron core applied and so the winding volume of the rod coil be created on a large volume, making a large one electrical performance of the rod coil can be achieved.

In den Unteranspruchen sind vorteilhafte Ausgestaltungen für die Realisierung der Erfindung angegeben. Durch das in Anspruch 7 angegebene Verfahren kann die Zündspule in fertigungstechnisch einfacher Weise gefertigt werden, da Nachbearbeitungsvorgänge entfallen.Advantageous refinements for are in the subclaims stated the realization of the invention. By in Claim 7 specified method, the ignition coil in be manufactured in a technically simple manner, because Post-processing operations are eliminated.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der Figurenbeschreibung näher erläutert. Ein ansatzweise im Schnitt dargestelltes Gehäuse sowie ein Kern der Stabspule mit einem Primärspulenkörper in einer Seitenansicht ist in der Figur 1 dargestellt. In der Figur 2 ist in einem Querschnitt entlang der Linie II-II von Figur 1 und um 90° gedreht der Kern mit dem Primärspulenkörper und ansatzweise das Gehäuse gezeigt.An embodiment of the invention is in the drawing shown and explained in more detail in the figure description. A housing shown in section as well as a Core of the rod coil with a primary coil body in one Side view is shown in Figure 1. In FIG. 2 is in a cross section along the line II-II of Figure 1 and rotated by 90 ° the core with the primary bobbin and the housing is shown.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Eine in den Figuren 1 und 2 ausschnittsweise dargestellte Stabspule 11 für Zündanlagen ist insbesondere als Zündspule in Brennkraftmaschinen von Kraftfahrzeugen in nicht näher dargestellter Weise zur Direktkontaktierung mit einer Zündkerze vorgesehen, die in einem Schacht im Zylinderkopf einer Brennkraftmaschine eingesetzt ist.One shown in sections in Figures 1 and 2 Rod coil 11 for ignition systems is particularly used as an ignition coil in internal combustion engines of motor vehicles in no closer shown way for direct contact with a Spark plug provided in a shaft in the cylinder head an internal combustion engine is used.

Die Stabspule 11 enthält in koaxialer Anordnung zu einer Längsachse 12 unter anderem in einem in der Grundform hohlzylindrischen Gehäuse 13 aus Kunststoff in zentraler Lage einen länglichen Kern 14, der auch als I-Kern bezeichnet wird. Der Kern 14 ist, wie aus der Figur 2 ersichtlich, aus einer Vielzahl aneinanderliegender, zu einander elektrisch isolierter Lamellen 16 aus Eisenblech zusammengesetzt.The rod coil 11 contains a coaxial arrangement Longitudinal axis 12 in one in the basic form hollow cylindrical housing 13 made of plastic in a central Location an elongated core 14, also called an I-core referred to as. The core 14 is, as from FIG. 2 evident from a variety of contiguous, too mutually electrically insulated slats 16 made of sheet iron composed.

In Stapelrichtung der einzelnen Lamellen 16 längs eines Pfeiles 17 ist als jeweiliger Abschluß eine untere Lamelle 18 und parallel dazu eine obere Lamelle 19 gebildet. Die Breite der einzelnen Lamellen 16 ist bei ihrer Herstellung durch einen Stanzvorgang etwas größer als die entsprechende Breite der späteren Querschnittsfläche des Kerns 14, die, wie aus der Figur 2 ersichtlich, durch einen Hüllkreis 21 begrenzt wird, wobei im Bereich der Lamellen 18, 19 Abflachungen 20 gebildet sind.In the stacking direction of the individual slats 16 along one Arrow 17 is a lower fin as the respective conclusion 18 and an upper lamella 19 are formed in parallel. The Width of the individual slats 16 is in their manufacture through a punching process slightly larger than the corresponding one Width of the later cross-sectional area of the core 14, which, as can be seen from FIG. 2, by an enveloping circle 21 is limited, with in the area of the slats 18, 19th Flattenings 20 are formed.

Mittels eines Verfahrens zur Materialabtragung werden die Überstände der Lamellen 16 bezüglich des Hüllkreises 21 entfernt. Die Bearbeitung erfolgt vorzugsweise durch Fräsen oder Schleifen mit einem Werkzeug. Die Bearbeitungsrichtung verläuft parallel zur Längsachse 12, um eine Lamellen 16 überbrückende Gratbildung zu vermeiden. Alternativ kann das Verfahren zur Materialabtragung auch über eine Laserbearbeitung erfolgen.Using a material removal process, the Projections of the fins 16 with respect to the enveloping circle 21 away. The processing is preferably carried out by milling or grinding with a tool. The machining direction runs parallel to the longitudinal axis 12 around a lamella 16 to avoid bridging burrs. Alternatively, it can Process for material removal also via laser processing respectively.

Der bearbeitete Kern 14 ist mit einem Primärspulenkörper 22 aus Kunststoff umspritzt. Der Primärspulenkörper 22 weist zwei voneinander beabstandete, radial gerichtete Flansche 23, 24 auf, die jeweils an einem Ende des stabförmigen Kerns 14 angebracht sind. Zwischen den Flanschen 23, 24 ist ein Wickelraum 26 gebildet.The machined core 14 has a primary bobbin 22 molded from plastic. The primary coil former 22 has two spaced apart, radially directed flanges 23, 24, each at one end of the rod-shaped core 14 are attached. There is a between the flanges 23, 24 Changing room 26 formed.

Die Flansche 23, 24 sind durch Verbindungsstücke 27, 28, die den Wickelraum 26 überbrücken und jeweils eine segmentförmige Querschnittsfläche aufweisen, miteinander verbunden. Die Verbindungsstücke 27, 28 liegen jeweils mit einer planen Bodenfläche 29 auf einer äußeren Deckfläche 31 auf der zugeordneten Lamelle 18, 19 auf und ergänzen jeweils mit einer bogenförmigen Mantelfläche 32 in der Schnittdarstellung nach Figur 2 den Hüllkreis 21 im Bereich der Lamellen 18, 19.The flanges 23, 24 are through connectors 27, 28, the bridge the changing room 26 and one each have segmental cross-sectional area with each other connected. The connecting pieces 27, 28 each lie with a flat bottom surface 29 on an outer top surface 31 on the associated lamella 18, 19 and supplement each with an arcuate lateral surface 32 in the 2 shows the enveloping circle 21 in the area of the slats 18, 19.

Eines der Verbindungsstücke 27, 28 kann eine Nut 33 zur Führung eines Drahtes aufweisen, mit dem der Wickelraum 26 zur Bildung einer Primärwicklung lagenweise bewickelt wird. Die Nut 33 ist dann erforderlich, wenn bei einer ungeraden Anzahl von Lagen Wicklungsanfang und Wicklungsende an Anschlußmitteln an einem der Flansche 23, 24 zusammengefaßt sein sollen.One of the connecting pieces 27, 28 can have a groove 33 for Guide a wire with which the winding space 26th is wound in layers to form a primary winding. The groove 33 is required if an odd one Number of layers at the beginning and end of the winding Connection means summarized on one of the flanges 23, 24 should be.

Falls ein direkter Kontakt des Drahtes auf der bearbeiteten Fläche des Kerns 14 unerwünscht ist, kann diese auch durch eine dünne selbstklebende Folie oder eine Papierlage abgedeckt werden. In case of direct contact of the wire on the machined Surface of the core 14 is undesirable, this can also by a thin self-adhesive film or a paper layer be covered.

Insbesondere mit der unmittelbaren Bewicklung des Kerns 14 ist ein großvolumiges Wickelvolumen der Stabspule ermöglicht, durch die sich bei vorgegebenen äußeren Abmessungen der Stabspule 11 eine große elektrische Leistung der Stabspule 11 erzielen läßt.In particular with the direct winding of the core 14 is a large-volume winding volume of the rod coil enables through the given external Dimensions of the rod coil 11 a large electrical power the rod coil 11 can be achieved.

Claims (7)

Stabspule für Zündanlagen, insbesondere als Zündspule in Brennkraftmaschinen von Kraftfahrzeugen, mit einem aus Lamellen (16) zusammengesetzten, sich entlang einer Längsachse (12) erstreckenden Kern (14), der einen Teil eines offenen Magnetkreises der Stabspule (11) bildet, dadurch gekennzeichnet, daß der Kern (14) zumindest abschnittsweise eine durch Abflachung (20) unterbrochene, mittels Materialabtrag hergestellte, durch einen Hüllkreis (21) begrenzte runde Querschnittsfläche aufweist.Rod coil for ignition systems, especially as an ignition coil in Internal combustion engines of motor vehicles, with one Slats (16) composed, along a Longitudinal axis (12) extending core (14) which is a part forms an open magnetic circuit of the rod coil (11), characterized in that the core (14) at least section by section, interrupted by flattening (20), produced by material removal, through an enveloping circle (21) has a limited round cross-sectional area. Stabspule nach Anspruch 1, dadurch gekennzeichnet, daß die Abflachungen (20) durch äußere Deckflächen (31), einerseits von einer oberen Lamelle (19) und andererseits von einer dazu parallel angeordneten unteren Lamelle (18) gebildet sind.Bar coil according to claim 1, characterized in that the flattenings (20) through outer cover surfaces (31), on the one hand by an upper lamella (19) and on the other hand from a lower lamella (18) arranged parallel to it are formed. Stabspule nach Anspruch 2, dadurch gekennzeichnet, daß der Kern (14) zumindest abschnittsweise mit einem Primärspulenkörper (22) umspritzt ist.Bar coil according to claim 2, characterized in that the core (14) at least in sections with a Primary coil former (22) is overmolded. Stabspule nach Anspruch 3, dadurch gekennzeichnet, daß der Primärspulenkörper (22) zwei voneinander beabstandete Flansche (23, 24) aufweist, die jeweils an einem Ende des stabförmigen Kerns (14) angebracht und durch Verbindungsstücke (26, 28) miteinander verbunden sind.Bar coil according to claim 3, characterized in that the primary bobbin (22) two spaced apart Flanges (23, 24), each at one end of the rod-shaped core (14) attached and through Connecting pieces (26, 28) are interconnected. Stabspule nach Anspruch 4, dadurch gekennzeichnet, daß die Verbindungsstücke (27, 28) in der Grundform eine segmentförmige Querschnittsfläche aufweisen und jeweils mit einer Bodenfläche (29) an einer der Deckflächen (31) der Lamellen (18, 19) anliegen, sowie mit einer Mantelfläche (32) die durch Materialabtrag hergestellte runde Querschnittsfläche des Kerns (14) zum vollständigen Hüllkreis (21) ergänzen.Bar coil according to claim 4, characterized in that the connecting pieces (27, 28) in the basic form have segmental cross-sectional area and each with a bottom surface (29) on one of the top surfaces (31) of the Slats (18, 19) rest as well as with a lateral surface (32) the round made by material removal Cross-sectional area of the core (14) for complete Complete the enveloping circle (21). Stabspule nach Anspruch 5, dadurch gekennzeichnet, daß zumindest eines der Verbindungsstücke (27, 28) eine Nut (33) zur Führung eines Drahtes längs des Kerns (14) aufweist.Bar coil according to claim 5, characterized in that at least one of the connecting pieces (27, 28) has a groove (33) for guiding a wire along the core (14). Verfahren zur Herstellung einer Stabspule für Zündanlagen nach Anspruch 1, dadurch gekennzeichnet, daß der Materialabtrag an den Lamellen (16) parallel zur Längsachse (12) des Kerns (14) vorgenommen wird und der Materialabtrag insbesondere durch Fräsen, Schleifen oder eine Laserbearbeitung erfolgt.Method of manufacturing a rod coil for ignition systems according to claim 1, characterized in that the Material removal on the fins (16) parallel to the longitudinal axis (12) of the core (14) and the material removal especially by milling, grinding or a Laser processing takes place.
EP99100426A 1998-04-30 1999-01-11 Ignition coil with rod-shaped core Ceased EP0953995A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998119585 DE19819585A1 (en) 1998-04-30 1998-04-30 Rod coil for ignition systems
DE19819585 1998-04-30

Publications (1)

Publication Number Publication Date
EP0953995A1 true EP0953995A1 (en) 1999-11-03

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EP99100426A Ceased EP0953995A1 (en) 1998-04-30 1999-01-11 Ignition coil with rod-shaped core

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EP (1) EP0953995A1 (en)
JP (1) JPH11340067A (en)
DE (1) DE19819585A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1288976A1 (en) * 2001-08-30 2003-03-05 Eldor Corporation S.p.A. Ferromagnetic nucleus, particularly for transformers or the like, and process for manufacturing the same
WO2015181704A1 (en) * 2014-05-27 2015-12-03 Castfutura S.P.A. High-voltage transformer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005047185A1 (en) * 2005-09-30 2007-04-05 Robert Bosch Gmbh Automotive ignition coil has a primary coil winding on the outside of a spray applied plastic sheath
DE102006019296A1 (en) * 2006-04-26 2007-10-31 Robert Bosch Gmbh Ignition coil for ignition plug in internal combustion engine, has upper and lower strips with reduced breadths in corner areas of inner magnetic core within primary and secondary coil bodies surrounding core

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB585200A (en) * 1943-12-27 1947-01-31 Gen Motors Corp Improvements in and relating to the manufacture of induction coils
DE1117731B (en) * 1957-12-17 1961-11-23 Smit & Willem & Co Nv Laminated magnetic core for a single-phase transformer of high power
DE1244944B (en) * 1963-04-06 1967-07-20 C H F Mueller G M B H Sheath core built from sheet metal for a high voltage transformer
DE3040742A1 (en) * 1980-10-29 1982-06-03 Transformatoren Union Ag, 7000 Stuttgart Choke coil having laminated cores with axial air gaps - has laminated core edges next to air gaps rounded along specified curved
US4663604A (en) * 1986-01-14 1987-05-05 General Electric Company Coil assembly and support system for a transformer and a transformer employing same
EP0291575A2 (en) * 1987-05-20 1988-11-23 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Horizontal deflection transformer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB585200A (en) * 1943-12-27 1947-01-31 Gen Motors Corp Improvements in and relating to the manufacture of induction coils
DE1117731B (en) * 1957-12-17 1961-11-23 Smit & Willem & Co Nv Laminated magnetic core for a single-phase transformer of high power
DE1244944B (en) * 1963-04-06 1967-07-20 C H F Mueller G M B H Sheath core built from sheet metal for a high voltage transformer
DE3040742A1 (en) * 1980-10-29 1982-06-03 Transformatoren Union Ag, 7000 Stuttgart Choke coil having laminated cores with axial air gaps - has laminated core edges next to air gaps rounded along specified curved
US4663604A (en) * 1986-01-14 1987-05-05 General Electric Company Coil assembly and support system for a transformer and a transformer employing same
EP0291575A2 (en) * 1987-05-20 1988-11-23 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Horizontal deflection transformer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1288976A1 (en) * 2001-08-30 2003-03-05 Eldor Corporation S.p.A. Ferromagnetic nucleus, particularly for transformers or the like, and process for manufacturing the same
WO2015181704A1 (en) * 2014-05-27 2015-12-03 Castfutura S.P.A. High-voltage transformer
EA033408B1 (en) * 2014-05-27 2019-10-31 Castfutura Spa High-voltage transformer

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Publication number Publication date
DE19819585A1 (en) 1999-11-04
JPH11340067A (en) 1999-12-10

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