EP0374524B1 - Pair of core laminates and core sheet parcel for shell form-type transformers - Google Patents
Pair of core laminates and core sheet parcel for shell form-type transformers Download PDFInfo
- Publication number
- EP0374524B1 EP0374524B1 EP89121755A EP89121755A EP0374524B1 EP 0374524 B1 EP0374524 B1 EP 0374524B1 EP 89121755 A EP89121755 A EP 89121755A EP 89121755 A EP89121755 A EP 89121755A EP 0374524 B1 EP0374524 B1 EP 0374524B1
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- core
- core laminations
- paired
- stamped
- laminations
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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
- H01F27/24—Magnetic cores
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
Definitions
- the invention relates to a pair of core sheets for sheathed core transformers, in particular with E and I core sheets, which are stamped so that they are inseparable in one plane by positive engagement by locking the I core sheets with the outer legs of the E core sheets together , and a shell core sheet package from such core sheet pairs.
- Waste-free punchable EI core sheets according to DIN are known. These core sheets are either nested alternately to form a finished core sheet package, or E-core packages and I-core packages are formed, which are butted together and welded together. It is not possible to lock these core sheets. This means that one of the aforementioned complex manufacturing processes is required for the assembly of the core packages.
- the punched step reaches into the window of the E-core sheet and thus significantly reduces the dimensions of the window. This reduces the performance of the transformer with this core cut compared to a core cut of the same volume without this window narrowing.
- the core laminated core is notched so far that widening of the legs of the E core laminate is necessary so that the magnetic flux can pass through the magnetic circuit undisturbed. This also leads to reduced performance per unit volume compared to a transformer with core sheets stamped without waste.
- the bolt in the form of an I-plate but must have a special geometry that is not stamped out of the E-core sheet without waste.
- DE 21 44 951 A1 discloses two-part transformer sheets for jacket transformers which can be snapped together.
- a geometry that cannot be stamped without waste is selected, locking lugs being designed such that the two parts snap into one another in the form of an EI, UT or UE by undercuts.
- JP-A-61-121 308 describes the production of a sheet metal core from E-shaped stamped sheet metal parts. Noses formed by an E-plate on the outer legs snap into the center in grooves formed on another E-plate. The E-sheets are not stamped without waste.
- the invention has for its object to provide core sheet pairs of the type described above, which can be stamped without waste in the DIN-compliant geometry, allow the use of all DIN-compliant components such as coil formers, foot brackets etc. and, in addition to the economical manufacturing process of punching, also an optimal assembly of the Enable E and I core packages.
- E and I core sheets with the outer legs of the E core sheets can also be connected to one another by frictional engagement, in that the E core sheets at least one stamped groove on the end faces of their outer legs and the I core sheets at least have two punched locking cams which can be received in the grooves.
- the grooves are expediently offset from the central longitudinal axes of the outer legs.
- the punched-in notches of the I-core sheets can correspond to the punched-in notches in the outer legs or opposite one another in the middle leg of the E-core sheets.
- the depth t of the notches is advantageously less than or equal to one fifth of the width b of the outer legs of the E-core sheets.
- Desired punching holes are expediently designed in accordance with the geometry of the grooves of the E-core sheets for the punching process.
- the width b2 of the locking cams is advantageously larger, preferably about 0.5% larger than the width b1 of the grooves and the distance a2 between the outer flanks of two locking cams is larger, preferably about 0.5% larger than the distance a1 between the outer walls of two corresponding grooves.
- At least one flank of each locking cam can be brought into frictional contact with at least one side wall of the corresponding groove to about 60% to 70% of the groove depth c 1.
- the punched locking cams of the I-core sheet are thus designed such that by inserting this I-core sheet into the associated grooves on the end face of the E-core sheet, the outer legs of this E-core sheet are slightly spread apart.
- the locking cam is designed so that its outer contour is slightly larger than the groove in the E-core sheet, which leads to clamping via friction locking of the locking cams in the groove.
- the jacket core sheet core package made of core sheet pairs according to the invention is advantageously constructed such that the E core sheets are combined to form an E core package and the I core sheets to form an I core package, and that the E core package and the I core package are non-positively joined together are.
- a transformer with E and I core sheets according to the invention can thus be manufactured according to the invention with simple aids such that a pre-packaged E-core packet and a pre-packaged I-core packet snap into one another.
- the positive and non-positive interlocking E and I core packages ensure a safe transition of the field lines from the E core package to the I core package.
- the notches in the E-core sheet are in turn dimensioned so that it is only in operation of the transformer negligible disturbances of the magnetic flux in the area of the notches occur.
- the dimensions of the standardized EI sheets according to DIN are observed; the coil formers, fastening elements, etc. according to DIN can thus also be used in a transformer according to the invention.
- E-core sheets 1 and I-core sheets 2 are punched without waste.
- 2 locking cams 4 are punched onto the I-core sheets during the punching process and, at the same time, notches 3 are punched into the E-core sheets 1.
- each E-core sheet has two outer legs 6 and 7 and a stamped-in groove 5 on the end faces of the outer legs 6 and 7.
- the E and I core sheets 1, 2 are stamped so that they can be connected inseparably in one plane by frictional engagement after stamping in one plane.
- the locking cams 4 are designed such that they can be frictionally received in the grooves 5.
- punching holes 8 in the sheet metal strip are required for the punching process. These transport holes 8 are designed so that they correspond to the geometry of the grooves 5 of the E-core sheets 1, as is required for the later positive connection.
- E- and I-core packages are constructed as shown in FIG. 1.
- the I-core package comes under pressure in a non-positive connection with the E-core package and snaps so to speak in this one.
- the distance a2 between the outer flanks of the two locking cams 4 is approximately 0.5% larger than the distance a1 between the outer walls of the two corresponding grooves.
- the locking cams 4 of the I-core sheet 2 are shaped so that their width b2 with which they engage in the groove 5 of the E-core sheet 1 by about 0.5% larger than the width b1 this Nut 5 is. This causes a slight spreading of the groove 5. This causes the locking cam 4 to become jammed and the E-core sheet 1 is firmly connected to the I-core sheet 2 by friction.
- the geometry of the locking cam 4 is selected so that the side wall of the groove 5 is contacted at least over 60% to 70% of the groove depth c 1 over a length c from the flank of the locking cam 4 .
- notches 9 in the middle leg of the E-core sheet are punched directly opposite and without waste.
- the effects described above are used to the same extent.
- the notches 3 and 9 are chosen so that their depth t is less than or equal to one fifth of the width b of the outer legs 6 or 7 (Fig. 1).
- the medial leg width 2b of the E core sheets 1 is twice that Width b of the outer legs 6 and 7.
- the E and I core sheets 1, 2 that snap into one another, so to speak, are advantageously punched in the dimensions according to DIN. This allows standardized bobbins and fasteners to be used directly. In addition, of course, other E and I geometries, which are punched differently from the standard, can also be implemented.
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- Manufacturing Cores, Coils, And Magnets (AREA)
Description
Die Erfindung bezieht sich auf ein Kernblechpaar für Mantelkerntransformatoren, insbesondere mit E- und I-Kernblechen, welche derart abfallos gestanzt sind, daß sie in einer Ebene untrennbar formschlüssig durch Kraftschluß durch Verrastung der I-Kernbleche mit den Außenschenkeln der E-Kernbleche miteinander verbindbar sind, und ein Mantelkernblechpaket aus derartigen Kernblechpaaren.The invention relates to a pair of core sheets for sheathed core transformers, in particular with E and I core sheets, which are stamped so that they are inseparable in one plane by positive engagement by locking the I core sheets with the outer legs of the E core sheets together , and a shell core sheet package from such core sheet pairs.
Abfallos stanzbare EI-Kernbleche gemäß DIN sind bekannt. Diese Kernbleche werden entweder wechselseitig zu einem fertigen Kernblechpaket geschachtelt, oder es werden E-Kernpakete und I-Kernpakete gebildet, die stumpf aufeinandergelegt und zusammengeschweißt werden. Ein Verrasten dieser Kernbleche ist nicht möglich. Damit wird für die Montage der Kernpakete eines der vorgenannten aufwendigen Fertigungsverfahren erforderlich.Waste-free punchable EI core sheets according to DIN are known. These core sheets are either nested alternately to form a finished core sheet package, or E-core packages and I-core packages are formed, which are butted together and welded together. It is not possible to lock these core sheets. This means that one of the aforementioned complex manufacturing processes is required for the assembly of the core packages.
Aus der DE 29 20 365 A1 sind Kernbleche der eingangs beschriebenen Art, insbesondere für Transformatoren mit Mantelkern bekannt, die abfallos stanzbar sind und nach dem Stanzen in einer Ebene formschlüssig untrennbar miteinander verbunden werden können. Bei dieser formschlüssigen Verbindung greift eine Stufe des I-Kernbleches in das Fenster des E-Kernbleches ein. Bei dieser Art des Formschlusses wird der Nachteil erkauft, daß mit zunehmender Standzeit der Stanzwerkzeuge die sich verändernde Stanzgeometrie schon bei geringfügigem Abnutzen der Werkzeuge zu keinen einwandfreien Verbindungen mehr führt. Bei der gewählten Geometrie des obigen Anspruches wird der Übergang des magnetischen Flusses vom E-Kernblech in das I-Kernblech verbessert. Es ergibt sich aber zwangsläufig der Nachteil, daß die angestanzte Stufe in das Fenster des E-Kernbleches hineingreift und damit die Abmessungen des Fensters deutlich verkleinert. Hierdurch wird das Leistungsvermögen des Transformators mit diesem Kernschnitt - gegenüber einem volumengleichen Kernschnitt ohne diese Fensterverengung - vermindert. Außerdem wird aufgrund der Geometrie der Stufe das Kernblechpaket so weit eingekerbt, daß eine Verbreiterung der Schenkel des E-Kernpakets erforderlich wird, damit der magnetische Fluß ungestört den Magnetkreis passieren kann. Auch dies führt gegenüber einem Trafo mit abfallos gestanzten Kernblechen zu einer verringerten Leistung je Volumeneinheit.DE 29 20 365 A1 discloses core sheets of the type described in the introduction, in particular for transformers with a jacket core, which can be punched without waste and which can be connected to one another in a form-fitting manner after punching in one plane. With this form-fitting connection, a step of the I-core sheet engages in the window of the E-core sheet. With this type of Form-locking is the disadvantage bought that with increasing service life of the punching tools, the changing punching geometry no longer leads to perfect connections even with slight wear of the tools. With the chosen geometry of the above claim, the transition of the magnetic flux from the E core sheet to the I core sheet is improved. However, there is inevitably the disadvantage that the punched step reaches into the window of the E-core sheet and thus significantly reduces the dimensions of the window. This reduces the performance of the transformer with this core cut compared to a core cut of the same volume without this window narrowing. In addition, due to the geometry of the step, the core laminated core is notched so far that widening of the legs of the E core laminate is necessary so that the magnetic flux can pass through the magnetic circuit undisturbed. This also leads to reduced performance per unit volume compared to a transformer with core sheets stamped without waste.
Bekannt ist auch aus der DE 33 18 370 C2 eine kraft- und formschlüssige Verbindung von E- mit I-Kernblechen. Hierbei wird aber nicht das Verbinden von abfallos stanzbaren E- und I-Kernblechen gelöst, sondern lediglich eine Verbindung des Mittelschenkels des E-Kernbleches mit dem Joch, so daß die freie Beweglichkeit des Mittelschenkels gegenüber dem Joch verhindert wird.From DE 33 18 370 C2, a non-positive and positive connection of E and I core sheets is also known. Here, however, the connection of waste-free punchable E and I core sheets is not solved, but only a connection of the middle leg of the E core sheet with the yoke, so that the free movement of the middle leg relative to the yoke is prevented.
Desweiteren ist aus der FR-A-2 150 731 (= DE 21 39 010A1) eine Verklinkung bekannt, bei der E- und I-Kernblech durch Kraftschluß querverriegelt werden. Der Riegel in Form eines I-Bleches muß aber eine spezielle Geometrie aufweisen, die nicht abfallos aus dem E-Kernblech gestanzt wird.Furthermore, a latch is known from FR-A-2 150 731 (= DE 21 39 010A1), in which the E and I core sheets are cross-locked by force locking. The bolt in the form of an I-plate but must have a special geometry that is not stamped out of the E-core sheet without waste.
Durch die DE 31 18 465 A1 sind zweiteilige Mantelkernbleche, insbesondere für Drosseln, bekannt. Dabei handelt es sich um E- und T-Kernbleche, die paketweise ineinander gerastet werden können. Hier wird die Möglichkeit des Rastens durch den Nachteil nicht mehr abfallos stanzbarer Bleche erkauft.From DE 31 18 465 A1 two-piece jacket core sheets, in particular for chokes, are known. These are E and T core sheets, which can be snapped together in packages. Here, the possibility of locking is bought by the disadvantage of sheet metal that can no longer be stamped without waste.
Weiter sind durch die DE 21 44 951 A1 zweiteilige Transformatorbleche für Manteltransformatoren bekannt, die ineinander gerastet werden können. Auch hier ist wiederum eine nicht abfallos stanzbare Geometrie gewählt, wobei Rastnasen so ausgebildet sind, daß durch Hinterschneidungen die beiden Teile in Form eines EI, UT oder UE ineinander rasten.Furthermore, DE 21 44 951 A1 discloses two-part transformer sheets for jacket transformers which can be snapped together. Here, too, a geometry that cannot be stamped without waste is selected, locking lugs being designed such that the two parts snap into one another in the form of an EI, UT or UE by undercuts.
In der nicht vorveröffentlichten EP-A-0353029 sind E- und I-Kernbleche beschrieben, bei denen Nasen im I-Blech gebildet sind, die in das E-Blech innerhalb des Schenkels eingefügt werden. Der schmälere Teil des verbleibenden E-Paketes wird derart gepreßt, daß er mit diesen Nasen zusammen die nötige Verankerung bildet, um somit den Kraftschluß zu bewirken.In the non-prepublished EP-A-0353029, E and I core sheets are described, in which noses are formed in the I sheet, which are inserted into the E sheet within the leg. The narrower part of the remaining E-packet is pressed in such a way that it forms the necessary anchoring together with these lugs so as to bring about the frictional connection.
JP-A-61-121 308 beschreibt die Herstellung eines Blechkerns aus E-förmigen gestanzten Blechteilen. Auf den Außenschenkeln von einem E-Blech gebildete Nasen rasten in auf einem anderen E-Blech gebildeten Nuten mittig ein. Die E-Bleche sind nicht abfallos gestanzt.JP-A-61-121 308 describes the production of a sheet metal core from E-shaped stamped sheet metal parts. Noses formed by an E-plate on the outer legs snap into the center in grooves formed on another E-plate. The E-sheets are not stamped without waste.
Alle bekannten rastbaren Blechgeometrien weisen die Nachteile auf, daß sie von der Norm abweichen, nicht abfallos stanzbar sind und nicht die Abmessungen gemäß DIN erfüllen.All known latchable sheet metal geometries have the disadvantages that they deviate from the norm, cannot be punched without waste and do not meet the dimensions according to DIN.
Der Erfindung liegt die Aufgabe zugrunde, Kernblechpaare der eingangs beschriebenen Art zu schaffen, die abfallos stanzbar in der DIN-gemäßen Geometrie die Verwendung aller DIN-gemäßen Bauteile wie Spulenkörper, Fußwinkel usw. gestatten und neben dem wirtschaftlichen Fertigungsverfahren des Stanzens auch ein optimales Zusammenfügen der E- und I-Kernpakete ermöglichen.The invention has for its object to provide core sheet pairs of the type described above, which can be stamped without waste in the DIN-compliant geometry, allow the use of all DIN-compliant components such as coil formers, foot brackets etc. and, in addition to the economical manufacturing process of punching, also an optimal assembly of the Enable E and I core packages.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die E- und I-Kernbleche mit den Außenschenkeln der E-Kernbleche zusätzlich durch Reibungsschluß miteinander verbindbar sind, indem die E-Kernbleche an den Stirnseiten ihrer Außenschenkel wenigstens je eine eingestanzte Nut und die I-Kernbleche wenigstens zwei angestanzte Rastnocken aufweisen, welche in den Nuten aufnehmbar sind.This object is achieved in that the E and I core sheets with the outer legs of the E core sheets can also be connected to one another by frictional engagement, in that the E core sheets at least one stamped groove on the end faces of their outer legs and the I core sheets at least have two punched locking cams which can be received in the grooves.
Die Nuten sind zweckmäßig gegenüber den Mittellängsachsen der Außenschenkel nach außen versetzt angeordnet.The grooves are expediently offset from the central longitudinal axes of the outer legs.
Den angestanzten Rastnocken der I-Kernbleche können abfallos eingestanzte Einkerbungen in den Außenschenkeln oder einander gegenüberliegend im Mittelschenkel der E-Kernbleche entsprechen.The punched-in notches of the I-core sheets can correspond to the punched-in notches in the outer legs or opposite one another in the middle leg of the E-core sheets.
Die Tiefe t der Einkerbungen ist vorteilhaft kleiner oder gleich einem Fünftel der Breite b der Außenschenkel der E-Kernbleche.The depth t of the notches is advantageously less than or equal to one fifth of the width b of the outer legs of the E-core sheets.
Zweckmäßig sind für den Stanzvorgang gewünschte Stanzlöcher der Geometrie der Nuten der E-Kernbleche entsprechend gestaltet.Desired punching holes are expediently designed in accordance with the geometry of the grooves of the E-core sheets for the punching process.
Vorteilhaft ist die Breite b₂ der Rastnocken größer, vorzugsweise etwa 0,5% größer, als die Breite b₁ der Nuten und der Abstand a₂ zwischen den Außenflanken zweier Rastnocken größer, vorzugsweise etwa 0,5% größer, als der Abstand a₁ zwischen den Außenwänden zweier entsprechender Nuten.The width b₂ of the locking cams is advantageously larger, preferably about 0.5% larger than the width b₁ of the grooves and the distance a₂ between the outer flanks of two locking cams is larger, preferably about 0.5% larger than the distance a₁ between the outer walls of two corresponding grooves.
Zweckmäßig ist wenigstens eine Flanke jedes Rastnockens auf etwa 60% bis 70% der Nuttiefe c₁ mit wenigstens einer Seitenwand der entsprechenden Nut in den Reibungskontakt bringbar.Expediently, at least one flank of each locking cam can be brought into frictional contact with at least one side wall of the corresponding groove to about 60% to 70% of the
Die angestanzten Rastnocken des I-Kernbleches sind also derart ausgebildet, daß durch das Einfügen dieses I-Kernbleches in die dazugehörigen Nuten an der Stirnseite des E-Kernbleches ein geringfügiges Aufspreizen der Außenschenkel dieses E-Kernbleches erfolgt. Zusätzlich ist der Rastnocken so gestaltet, daß er in seiner Außenkontur geringfügig größer als die Nut im E-Kernblech ausgeführt ist, was zum Klemmen über Reibungsschluß der Rastnocken in der Nut führt.The punched locking cams of the I-core sheet are thus designed such that by inserting this I-core sheet into the associated grooves on the end face of the E-core sheet, the outer legs of this E-core sheet are slightly spread apart. In addition, the locking cam is designed so that its outer contour is slightly larger than the groove in the E-core sheet, which leads to clamping via friction locking of the locking cams in the groove.
Das Mantelkernblechpaket aus Kernblechpaaren gemäß der Erfindung ist vorteilhaft so aufgebaut, daß die E-Kernbleche zu einem E-Kernpaket und die I-Kernbleche zu einem I-Kernpaket zusammengefügt sind, und daß das E-Kernpaket und das I-Kernpaket kraftschlüssig ineinander einrastend zusammengefügt sind.The jacket core sheet core package made of core sheet pairs according to the invention is advantageously constructed such that the E core sheets are combined to form an E core package and the I core sheets to form an I core package, and that the E core package and the I core package are non-positively joined together are.
Ein Transformator mit erfindungsgemäßen E- und I-Kernblechen kann also erfindungsgemäß mit einfachen Hilfsmitteln so gefertigt werden, daß ein vorpaketiertes E-Kernpaket und ein vorpaketiertes I-Kernpaket ineinander rasten. Die form- und kraftschlüssig ineinander gerasteten E- und I-Kernpakete gewährleisten einen sicheren Übergang der Feldlinien vom E-Kernpaket in das I-Kernpaket. Die Einkerbungen im E-Kernblech wiederum sind so dimensioniert, daß es beim Betrieb des Transformators nur zu vernachlässigbar kleinen Störungen des magnetischen Flusses im Bereich der Einkerbungen kommt.A transformer with E and I core sheets according to the invention can thus be manufactured according to the invention with simple aids such that a pre-packaged E-core packet and a pre-packaged I-core packet snap into one another. The positive and non-positive interlocking E and I core packages ensure a safe transition of the field lines from the E core package to the I core package. The notches in the E-core sheet are in turn dimensioned so that it is only in operation of the transformer negligible disturbances of the magnetic flux in the area of the notches occur.
Bei den erfindungsgemäßen E- und I-Kernblechen werden die Abmessungen der genormten EI-Bleche nach DIN eingehalten; damit sind auch bei einem erfindungsgemäßen Transformator die Spulenkörper, Befestigungselemente usw. gemäß DIN einsetzbar.In the E and I core sheets according to the invention, the dimensions of the standardized EI sheets according to DIN are observed; the coil formers, fastening elements, etc. according to DIN can thus also be used in a transformer according to the invention.
Die Erfindung ist im folgenden an Ausführungsbeispielen und anhand der Zeichnungen näher erläutert. In den Zeichnungen zeigen
- Fig. 1
- ein E-Kernpaket und ein I-Kernpaket gemäß der Erfindung in perspektivischer Teilansicht vor dem kraftschlüssigen Zusammenfügen der beiden Pakete,
- Fig. 2
- eine Rastnocke eines I-Kernbleches beim Einfügen in eine Nut eines E-Kernbleches gemäß der Erfindung in perspektivischer Darstellung,
- Fig. 3
- die Rastnocke nach Einfügen in die Nut als Einzelheit Z von Fig. 1 in perspektivischer Darstellung,
- Fig. 4
- eine Schnittfolge abfallos stanzbarer E- und I-Kernbleche gemäß der Erfindung, und
- Fig. 5
- ein alternatives Ausführungsbeispiel eines erfindungsgemäßen E-Kernblechs.
- Fig. 1
- an E-core package and an I-core package according to the invention in a partial perspective view before the positive connection of the two packages,
- Fig. 2
- a locking cam of an I-core sheet when inserted into a groove of an E-core sheet according to the invention in a perspective view,
- Fig. 3
- the locking cam after insertion into the groove as detail Z of Fig. 1 in a perspective view,
- Fig. 4
- a cut sequence of waste-free stampable E and I core sheets according to the invention, and
- Fig. 5
- an alternative embodiment of an E-core sheet according to the invention.
Für den Aufbau von E-Kernpaketen und I-Kernpaketen in Fig. 1 werden, wie in Fig. 4 dargestellt, E-Kernbleche 1 und I-Kernbleche 2 abfallos gestanzt. Dabei werden während des Stanzvorganges an die I-Kernbleche 2 Rastnocken 4 angestanzt und damit gleichzeitig Einkerbungen 3 in die E-Kernbleche 1 eingestanzt.For the construction of E-core packages and I-core packages in FIG. 1, as shown in FIG. 4,
Jedes E-Kernblech weist, wie in Fig. 1 dargestellt, zwei Außenschenkel 6 und 7 und an den Stirnseiten der Außenschenkel 6 und 7 je eine eingestanzte Nut 5 auf.As shown in FIG. 1, each E-core sheet has two
Die E- und I-Kernbleche 1, 2 werden derart abfallos gestanzt, daß sie nach dem Stanzen in einer Ebene untrennbar formschlüssig durch Reibungsschluß miteinander verbindbar sind. Hierfür sind die Rastnocken 4 derart ausgebildet, daß sie reibungsschlüssig in den Nuten 5 aufnehmbar sind.The E and
Beim abfallosen Stanzen der E-Kernbleche 1 und I-Kernbleche 2 werden für den Stanzvorgang Stanzlöcher 8 im Blechstreifen (Fig. 4) benötigt. Diese Transportlöcher 8 sind so gestaltet, daß sie der Geometrie der Nuten 5 der E-Kernbleche 1 entsprechen, wie sie für die spätere kraftschlüssige Verbindung benötigt wird.When waste-free punching of the
Mit den so erfindungsgemäß abfallos gestanzten E- und I-Kernblechen 1, 2 werden E- und I-Kernpakete aufgebaut, wie sie in Fig. 1 dargestellt sind. Durch Bewegen des I-Kernpakets in Richtung der Pfeile in Fig. 1 auf das E-Kernpaket zu kommt das I-Kernpaket unter Druck in kraftschlüssige Verbindung mit dem E-Kernpaket und rastet sozusagen in dieses ein. Hierfür ist der Abstand a₂ zwischen den Außenflanken der beiden Rastnocken 4 etwa 0,5% größer als der Abstand a₁ zwischen den Außenwänden der zwei entsprechenden Nuten gewählt. Dies bewirkt beim Einfügen des I-Kernpakets in die Nuten 5 des E-Kernpakets ein Aufspreizen der Außenschenkel 6 und 7 der E-Kernbleche 1 des E-Kernpakets.With the E- and I-
Wie in Fig. 2 dargestellt, sind die Rastnocken 4 des I-Kernblechs 2 so geformt, daß ihre Breite b₂, mit der sie in die Nut 5 des E-Kernbleches 1 eingreifen, um etwa 0,5% größer als die Breite b₁ dieser Nut 5 ist. Hierdurch wird ein geringfügiges Aufspreizen der Nut 5 bewirkt. Damit kommt es zum Einklemmen des Rastnockens 4 und über Reibungsschluß wird das E-Kernblech 1 mit dem I-Kernblech 2 fest verbunden. Um den Reibungsschluß zu optimieren ist, wie in Fig. 3 dargestellt, die Geometrie des Rastnockens 4 so gewählt, daß die Seitenwand der Nut 5 wenigstens über 60% bis 70% der Nuttiefe c₁ über eine Länge c von der Flanke des Rastnockens 4 kontaktiert wird.As shown in Fig. 2, the
Bei dem in Fig. 5 dargestellten weiteren Ausführungsbeispiel eines E-Kernblechs sind statt der Einkerbungen 3 in den Außenschenkeln 6 und 7 des E-Kernblechs 1 Einkerbungen 9 im Mittelschenkel des E-Kernblechs direkt gegenüberliegend abfallos eingestanzt. Die zuvor beschriebenen Effekte werden in demselben Maße genutzt. In allen Fällen sind die Einkerbungen 3 und 9 so gewählt, daß ihre Tiefe t kleiner oder gleich einem Fünftel der Breite b der Außenschenkel 6 oder 7 (Fig. 1) ist. Die Mittelschenkelbreite 2b der E-Kernbleche 1 beträgt das Doppelte der Breite b der Außenschenkel 6 bzw. 7.In the further exemplary embodiment of an E-core sheet shown in FIG. 5, instead of the notches 3 in the
Die sozusagen ineinander rastenden E- und I-Kernbleche 1, 2 werden vorteilhaft in den Abmessungen nach DIN gestanzt. Hiermit lassen sich genormete Spulenkörper und Befestigungselemente direkt verwenden. Darüber hinaus lassen sich selbstverständlich auch weitere E- und I-Geometrien, die abweichend von der Norm gestanzt werden, ausführen.The E and
Claims (10)
- Paired core laminations for shell-type transformers, in particular with E- and I- core laminations (1, 2), which are stamped without wastage in such a way that by latching the I-core laminations to the outer limbs of the E-core laminations they can be permanently connected to each other in one plane in an interlocking manner through force locking, characterised in that the E- and I-core laminations (1, 2) can be additionally connected to each other by friction-locking with the outer limbs (6, 7) of the E-core laminations, wherein the E-core laminations have in each case at least one groove stamped in the front faces of their outer limbs and the I-core laminations have stamped on them at least two latch cams which can be received by the grooves.
- Paired core laminations according to claim 1, characterised in that the grooves (5) are arranged offset towards the outside in relation to the longitudinal centre axes of the outer limbs (6, 7).
- Paired core laminations according to claim 1 or 2, characterised in that the latch cams (4) stamped from the I-core laminations correspond to the notches (3) stamped without waste into the E-core laminations (1) of the outer limbs (6, 7).
- Paired core laminations according to claim 1 or 2, characterised in that the latch cams (4) stamped from the I-core laminations correspond to notches (9) stamped without waste into the E-core laminations (1) arranged opposite each other in the centre limb of the E-core laminations (1).
- Paired core laminations according to claim 3 or 4, characterised in that the depth t of the notches (3, 9) is less or equal to one fifth of the width b of the outer limbs (6, 7) of the E-core laminations (1).
- Paired core laminations according to one of the claims 1 to 5, characterised in that the stamping holes (8) are shaped to correspond to the geometry of the grooves (5) of the E-core laminations (1).
- Paired core laminations according to one of the claims 1 to 6, characterised in that the width b₂ of the latch cams (4) is greater, preferably by approximately 0,5%, than the width b₁ of the grooves (5).
- Paired core laminations according to one of the claims 1 to 7, characterised in that the distance a₂ between the outer sides of two latch cams (4, 4) is greater, preferably by 0,5%, than the distance a₁ between the outer walls of two corresponding grooves (5, 5).
- Paired core laminations according to one of the claims 1 to 8, characterised in that at least one side of each latch cam (4) can be brought into friction-locking with at least one side wall of the corresponding groove (5) to approximately 60% to 70% of the groove depth c₁.
- Laminated shell core stack consisting of paired core laminations according to one of the preceding claims, characterised in that the E-core laminations (1) are assembled into an E-core stack and that the E-core stack and the I-core stack are assembled by latching them together in a force-locking manner.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3842885A DE3842885C1 (en) | 1988-12-20 | 1988-12-20 | |
| DE3842885 | 1988-12-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0374524A1 EP0374524A1 (en) | 1990-06-27 |
| EP0374524B1 true EP0374524B1 (en) | 1994-03-30 |
Family
ID=6369634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89121755A Expired - Lifetime EP0374524B1 (en) | 1988-12-20 | 1989-11-24 | Pair of core laminates and core sheet parcel for shell form-type transformers |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0374524B1 (en) |
| DE (2) | DE3842885C1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2254964A (en) * | 1991-03-26 | 1992-10-21 | Scott & Co Ltd Geo | Transformer core assembly |
| SI20600A (en) * | 2000-06-01 | 2001-12-31 | Iskraemeco | Process for manufacturing composite lamella packages of detachable type for voltage cores of inductive power meters from partial lamella packages |
| JP5494612B2 (en) | 2011-10-18 | 2014-05-21 | 株式会社豊田自動織機 | Magnetic core and induction device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0353029A2 (en) * | 1988-07-27 | 1990-01-31 | Linton And Hirst Limited | Improvements in laminations |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1345523A (en) * | 1970-09-10 | 1974-01-30 | Friedland Ltd V E Doggart J Sk | Transformer laminations |
| DE2139010A1 (en) * | 1971-08-04 | 1973-03-08 | Kammeyer Karl | DIVIDED SHEET METAL SECTION FOR TRANSFORMERS |
| LU65764A1 (en) * | 1971-08-04 | 1972-11-28 | ||
| DE2920365A1 (en) * | 1979-05-19 | 1980-11-27 | Philberth Karl Dr Phys | CORE SHEET FOR SHELL CORES, ESPECIALLY FOR TRANSFORMERS |
| DE3118465A1 (en) * | 1981-05-09 | 1982-11-25 | Bruno 8550 Forchheim Waasner | Two-piece core laminate, especially for inductors |
| DE3318370C2 (en) * | 1983-05-20 | 1986-02-06 | Waasner, Bruno, 8550 Forchheim | Sheet metal core made of two parts and with three legs |
-
1988
- 1988-12-20 DE DE3842885A patent/DE3842885C1/de not_active Expired - Fee Related
-
1989
- 1989-11-24 EP EP89121755A patent/EP0374524B1/en not_active Expired - Lifetime
- 1989-11-24 DE DE89121755T patent/DE58907347D1/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0353029A2 (en) * | 1988-07-27 | 1990-01-31 | Linton And Hirst Limited | Improvements in laminations |
Also Published As
| Publication number | Publication date |
|---|---|
| DE58907347D1 (en) | 1994-05-05 |
| DE3842885C1 (en) | 1990-04-26 |
| EP0374524A1 (en) | 1990-06-27 |
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