EP0127119A1 - Electomagnetic appliance for high-frequency power circuits, particularly a transformer or reactive coil - Google Patents

Electomagnetic appliance for high-frequency power circuits, particularly a transformer or reactive coil Download PDF

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Publication number
EP0127119A1
EP0127119A1 EP19840105853 EP84105853A EP0127119A1 EP 0127119 A1 EP0127119 A1 EP 0127119A1 EP 19840105853 EP19840105853 EP 19840105853 EP 84105853 A EP84105853 A EP 84105853A EP 0127119 A1 EP0127119 A1 EP 0127119A1
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Prior art keywords
yokes
transformer
core
tape
amorphous
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EP19840105853
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German (de)
French (fr)
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Nomura Toshihiro
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Fuji Electric Co Ltd
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Fuji Electric Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range

Definitions

  • the invention relates to electromagnetic devices for high-frequency power circuits, in particular transformers or choke coils, with an iron core made of amorphous tape as a magnetic material and with yokes.
  • Such electromagnetic devices must not only have excellent magnetic properties when operated in high-frequency power circuits, but must also allow a reduction in the total losses and the rise in temperature due to low iron losses and, moreover, must be as compact as possible with a low weight.
  • the widely used iron cores made of conventional transformer sheet have a relatively high saturation value for the magnetic flux density. If the frequency of the alternating magnetic field rises extremely high, both the magnetic reversal losses and the eddy current losses inevitably increase because the silicon sheet cannot be made as thin as desired due to its physical properties. With regard to the efficiency and the rise in temperature, the use of steel sheet alloyed with silicon is therefore associated with considerable disadvantages.
  • a known transformer for use in a high-frequency power circuit is conventionally constructed by arranging a yoke 31 made of rectangularly cut lamellae made of ordinary silicon-alloyed transformer sheet metal instead of amorphous magnetic material, since the amorphous material, as stated above, is difficult to cut.
  • the yoke 31 has a width B 1 which is approximately equal to the outer diameter D of a core leg 1 designed as a band winding made of amorphous band. Both ends of the core legs 1 are covered by yokes 31.
  • Undervoltage and high-voltage windings 2 are arranged in a conventional manner around the core limbs 1.
  • the disadvantage here is that it is impossible to make the transformer more compact than usual because a certain type of magnetic material is required for the production of the core legs and also because the height H 1 of the yokes 31 or the width of the transformer sheet alloyed with silicon Rectangularly cut pieces must be approximately equal to the outer diameter D of the core leg 1 designed as a band winding, so that the magnetic cross section of the yokes 31 corresponds to that of the core leg 1.
  • the invention is therefore based on the object, in view of the disadvantages inherent in conventional transformers when operating at high frequency in power circuits, to provide a transformer whose iron core material enables the construction of a compact and light device and in which both the core legs and the yokes are made Amorphous tape are made and have excellent magnetic properties.
  • an electromagnetic device for use in power circuits operated at high frequency for example a transformer or a choke coil, is produced using amorphous magnetic material, whereby according to the invention, to achieve a compact structure and a low weight, each as a tape winding made of amorphous tape Yoke designed as a magnetic material is arranged on each of the two end faces of core legs, the core legs also being designed as a tape winding made of amorphous tape made of magnetic material and the magnetic cross section of the yokes designed as a tape winding corresponds to the magnetic cross section of the tape winding of a core leg.
  • yokes 32 designed as a band winding are provided, which are coupled to both sides of columnar core legs 1 designed as a band winding.
  • the yokes 32 are produced by laterally compressing a ring 6, which in turn is made of amorphous tape as a magnetic material by winding onto a suitable winding core 5 according to FIG. 5 and is brought into an oval shape by lateral pressing.
  • the core legs 1 are also produced by winding amorphous magnetic tape as an iron core material on the circumference of a suitable winding core 4.
  • Primary and secondary windings 2 surround the circumference of the columnar core legs 1. Since the alternating magnetic flux penetrates the amorphous ribbon equally well in every winding direction, this is also the case at the point of contact of the columnar core legs with the oval yokes 32 designed as ribbon winding and that due to the alternating magnetic flux Eddy current losses caused in the wound iron core material have almost disappeared, so that the otherwise usual reduction in efficiency and the temperature rise are reduced. Since the width B 2 of the yokes 32 at the point of contact with the core legs is at least equal to their diameter D, the height H 2 of the yokes 32 in this exemplary embodiment is smaller than the height H 1 in the conventional transformer according to FIG. 1. This reduction in height is due to the superior magne properties of the amorphous material possible via the corresponding properties of silicon alloy transformer sheet.
  • the effective width B 4 of the wound yokes 34a and 34b is increased to such an extent that it is approximately twice the outer diameter D of the columnar core legs 1.
  • the enlargement of the width B 4 is achieved in the case of FIG. 6 by doubling the number of turns of the amorphous magnetic tape for the yoke 34a and in the case of FIG. 8 by the yoke 34b being composed of two partial yokes, each approximately has the same number of turns of the amorphous magnetic strip material as the yoke 32 in FIG. 3.
  • the height H 4 is half the value of the height H 2 in the exemplary embodiment according to FIG 4 reduced, so that the transformer can be made very compact overall.
  • three column-like core limbs 1 are provided, which are made of amorphous tape from a magnetic material, each of which is surrounded by one or more windings 2.
  • the three core legs 1 are set up on the corners of a triangle and the end faces of at least the core legs 1 are covered by a triangular yoke 35, which is also designed as a band winding.
  • the triangular yokes 35 after their installation in the transformer are expediently similar to the aforementioned yokes, initially also wound onto a winding core with a circular cross section and only afterwards lateral pressing brought into its final shape.
  • a transformer is manufactured with column-like core legs 1 designed as tape windings and yokes also designed as tape windings, it is very simple to manufacture, in terms of manufacturing technology, to provide a gap 7 in at least one, preferably the upper, yoke 36a, the width of which is equal to the outer diameter of the winding core for the core legs 1 is.
  • This creates space for both the core limbs 1 and the cooling tubes 8 filled with cooling liquid and which pass through the yoke 36a and which carry cooling fins 9 on their end above the yoke 36a.
  • the tubes 8 it is also possible to arrange the tubes 8 so that they penetrate the core legs 1 and the two yokes 36a and 36b and thereby achieve the same cooling effect.
  • part of the width of the yokes is claimed by the tubes 8, so that in order to restore the required yoke cross section, the height H 6 must again be made somewhat larger than the height H 2 in the exemplary embodiment according to FIG. 4.
  • the above description relates to electromagnetic devices for use in high-frequency power circuits and relates in particular to transformers and inductors with column-like iron core legs and yokes made of amorphous magnetic strip material.
  • the advantageous effects of the arrangement according to the invention of columnar core legs wound from tape and the yokes also designed as tape winding can be achieved without difficulty even with the use of very thin material with low magnetic reversal losses, for example with a correspondingly thinly rolled steel tape alloyed with silicon or with permalloy tape.
  • electromagnetic devices for use in power circuits operated with high-frequency currents, it is particularly advantageous to use electromagnetic devices in which core legs made of amorphous magnetic tape and also made of amorphous magnetic tape material are provided, the yokes being arranged on both sides of the column-like core legs, which have windings on their circumference wear, and wherein the magnetic cross section of the yokes corresponds to the magnetic cross sections of the core legs.
  • Electromagnetic devices constructed in this way are very compact and can be carried out with low weight for use in high-frequency circuits because the iron losses are much lower than in conventional comparable devices.
  • the arrangement of cooling tubes in the gaps and recesses of the yokes and core legs allows the heat generated by the iron losses to be dissipated directly to the outside, so that an increase in temperature is substantially suppressed.

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  • Power Engineering (AREA)
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  • Transformers For Measuring Instruments (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

In recent times, an amorphous magnetic material in the form of very thin strip has been used for the iron cores carrying the magnetic flux in such appliances. According to the invention, yokes (32, 34, 35 and 36) belonging to the same iron core together with the associated core limbs (1) are wound as strip windings from this very thin amorphous magnetic strip material, and their magnetically effective cross- sections are matched to one another. Electromagnetic appliances provided with iron cores designed according to the invention for use in high-frequency power circuits lead to particularly compact designs characterised by a low inherent weight. <IMAGE>

Description

Die Erfindung bezieht sich auf elektromagnetische Geräte für mit Hochfrequenz betriebene Leistungsstromkreise, insbesondere Transformatoren oder Drosselspulen, mit einem Eisenkern aus amorphem Band als magnetischem Werkstoff und mit Jochen.The invention relates to electromagnetic devices for high-frequency power circuits, in particular transformers or choke coils, with an iron core made of amorphous tape as a magnetic material and with yokes.

Derartige elektromagnetische Geräte müssen beim Betrieb in Leistungsstromkreisen hoher Frequenz nicht nur ausgezeichnete magnetische Eigenschaften aufweisen, sondern darüber hinaus durch niedrige Eisenverluste eine Verringerung der Gesamtverluste und des Temperaturanstiegs erlauben und müssen darüber hinaus bei geringem Gewicht möglichst kompakt sein.Such electromagnetic devices must not only have excellent magnetic properties when operated in high-frequency power circuits, but must also allow a reduction in the total losses and the rise in temperature due to low iron losses and, moreover, must be as compact as possible with a low weight.

Hohe Frequenz bei großem Leistungsvermögen in elektrischen Stromkreisen ist in neuerer Zeit erforderlich geworden bei der Entwicklung von Einrichtungen zur Steuerung von kontaktlosen Schaltelementen, wie Leistungstransistoren und deren Beschaltungen. Da die Spannungsfrequenz im Transformator oder einer Drossel beim Betrieb in derartigen Stromkreisen extrem hoch ist, kann die Zahl der Windungen in den Spulen verringert werden und dadurch ein kompakter Aufbau bei geringem Gewicht für die Transformatoren und Drosseln erreicht werden. Infolgedessen werden der Eisenkern und die Joche sehr wichtige Bauteile, da sie über ihren Aufbau und ihr Gewicht die Größe und das Gewicht des elektromagnetischen Gerätes wesentlich beeinflussen. Häufig werden Ferritkerne, die niedrige Wirbelstromverluste gewährleisten, als Werkstoff für die Eisenkerne in elektromagnetischen Geräten eingesetzt, die mit einem Laststrom hoher Frequenz von einigen kHz bis zu einigen Hundert kHz belastet sind. Nachteilig ist jedoch bei den Ferritkernen der niedrige Sättigungswert für die Magnetflußdichte.High frequency with high performance in electrical circuits has recently become necessary in the development of devices for controlling contactless switching elements, such as power transistors and their circuits. Since the voltage frequency in the transformer or a choke is extremely high when operating in such circuits, the number of turns in the coils can be reduced and a compact structure with low weight can be achieved for the transformers and chokes. As a result, the iron core and the yokes become very important components because their structure and weight significantly influence the size and weight of the electromagnetic device. Ferrite cores, which ensure low eddy current losses, are frequently used as a material for the iron cores in electromagnetic devices which are loaded with a high-frequency load current of a few kHz to a few hundred kHz. However, a disadvantage of the ferrite cores is the low saturation value for the magnetic flux density.

Dagegen haben die verbreitet eingesetzten Eisenkerne aus herkömmlichem Transformatorblech einen verhältnismäßig hohen Sättigungswert für die Magnetflußdichte. Steigt die Frequenz des Magnetwechselfeldes extrem hoch, so steigen jedoch zwangsläufig sowohl die Ummagnetisierungsverluste als auch die Wirbelstromverluste, weil das Siliziumblech auf Grund seiner physikalischen Eigenschaften nicht beliebig dünn herstellbar ist. Im Hinblick auf den Wirkungsgrad und den Temperaturanstieg ist daher der Einsatz von mit Silizium legiertem Stahlblech mit erheblichen Nachteilen verbunden.In contrast, the widely used iron cores made of conventional transformer sheet have a relatively high saturation value for the magnetic flux density. If the frequency of the alternating magnetic field rises extremely high, both the magnetic reversal losses and the eddy current losses inevitably increase because the silicon sheet cannot be made as thin as desired due to its physical properties. With regard to the efficiency and the rise in temperature, the use of steel sheet alloyed with silicon is therefore associated with considerable disadvantages.

Andererseits hat weder kristalliner magnetischer Werkstoff noch amorpher magnetischer Werkstoff, gewonnen durch extrem schnelle Abkühlung aus metallischen Legierungen, ausreichende Beachtung gefunden, obwohl dieser Werkstoff eine Anzahl von Vorteilen aufweist, einschließlich der Möglichkeit, extrem dünne Werkstoffe für Eisenkerne von elektromagnetischen Geräten für mit hochfrequentem Leistungsstrom betriebene elektromagnetische Geräte herzustellen. Diese Werkstoffe weisen ausgezeichnete magnetische Eigenschaften verbunden mit hohem Widerstand gegen Wirbelströme auf. Nachteilig ist jedoch, daß der amorphe Werkstoff lediglich in Form von rechteckigem Band technisch herstellbar ist und nachteilig ist vor allem, daß der amorphe Werkstoff darüber hinaus infolge seiner mechanischen Eigenschaften nur mit Schwierigkeiten zu schneiden ist.On the other hand, neither crystalline magnetic material nor amorphous magnetic material obtained by extremely rapid cooling from metallic alloys has received sufficient attention, although this material has a number of advantages, including the possibility of using extremely thin materials for iron cores of electromagnetic devices for high-frequency power currents manufacture electromagnetic devices. These materials have excellent magnetic properties combined with high resistance to eddy currents. However, it is disadvantageous that the amorphous material can only be produced technically in the form of a rectangular band and is disadvantageous above all that the amorphous material is also difficult to cut due to its mechanical properties.

In Übereinstimmung hiermit ist, wie in den Fig. 1 und 2 dargestellt, ein bekannter Transformator zum Einsatz in einem Hochfrequenzleistungsstromkreis durch Anordnung eines Joches 31 aus rechteckig zugeschnittenen Lamellen aus gewöhnlichem siliziumlegiertem Transformatorblech an Stelle von amorphem magnetischem Werkstoff konventionell aufgebaut, da der amorphe Werkstoff, wie oben angegeben, schwer zu schneiden ist. Das Joch 31 hat eine Breite B1, die ungefähr gleich ist dem Außendurchmesser D eines als Bandwicklung aus amorphem Band ausgeführten Kernschenkels 1. Beide Enden der Kernschenkel 1 sind durch Joche 31 abgedeckt. Um die Kernschenkel 1 sind in üblicher Weise Unterspannungs-und Oberspannungswicklungen 2 angeordnet. Nachteilig ist hierbei jedoch, daß es ausgeschlossen ist den Transformator kompakter als üblich auszufüh- ren, weil eine bestimmte Art des magnetischen Werkstoffs erforderlich ist zur Herstellung der Kernschenkel und weil außerdem die Höhe H1 der Joche 31 bzw. die Breite der aus Silizium legiertem Transformatorblech rechteckig zugeschnittenen Stücke ungefähr gleich dem Außendurchmesser D der als Bandwicklung ausgeführten Kernschenkel 1 gleich sein müssen, damit der Magnetquerschnitt der Joche 31 dem der Kernschenkel 1 entspricht.In accordance with this, as shown in FIGS. 1 and 2, a known transformer for use in a high-frequency power circuit is conventionally constructed by arranging a yoke 31 made of rectangularly cut lamellae made of ordinary silicon-alloyed transformer sheet metal instead of amorphous magnetic material, since the amorphous material, as stated above, is difficult to cut. The yoke 31 has a width B 1 which is approximately equal to the outer diameter D of a core leg 1 designed as a band winding made of amorphous band. Both ends of the core legs 1 are covered by yokes 31. Undervoltage and high-voltage windings 2 are arranged in a conventional manner around the core limbs 1. The disadvantage here, however, is that it is impossible to make the transformer more compact than usual because a certain type of magnetic material is required for the production of the core legs and also because the height H 1 of the yokes 31 or the width of the transformer sheet alloyed with silicon Rectangularly cut pieces must be approximately equal to the outer diameter D of the core leg 1 designed as a band winding, so that the magnetic cross section of the yokes 31 corresponds to that of the core leg 1.

Der Erfindung liegt daher die Aufgabe zugrunde, im Hinblick auf die den konventionellen Transformatorren beim Betrieb mit hoher Frequenz in Leistungsstromkreisen innewohnenden Nachteile einen Transformator zu schaffen, dessen Eisenkernwerkstoff den Aufbau eines kompakten und leichten Gerätes ermöglicht und bei dem sowohl die Kernschenkel als auch die Joche aus amorphem Band hergestellt sind und deren ausgezeichnete magnetische Eigenschaften aufweisen.The invention is therefore based on the object, in view of the disadvantages inherent in conventional transformers when operating at high frequency in power circuits, to provide a transformer whose iron core material enables the construction of a compact and light device and in which both the core legs and the yokes are made Amorphous tape are made and have excellent magnetic properties.

Zur Lösung dieser Aufgabe ist ein elektromagnetisches Gerät zum Einsatz in mit hoher Frequenz betriebenen Leistungsstromkreisen, beispielsweise ein Transformator oder eine Drosselspule, unter Verwendung von amorphem magnetischen Werkstoff hergestellt, wobei zur Erzielung eines kompakten Aufbaus und eines geringen Gewichtes erfindungsgemäß je ein als Bandwicklung aus amorphem Band als magnetischem Werkstoff ausgeführtes Joch auf jeder der beiden Stirnflächen von Kernschenkeln angeordnet ist, wobei die Kernschenkel ebenfalls als Bandwicklung aus amorphem Band aus magnetischem Werkstoff ausgeführt sind und der Magnetquerschnitt der als Bandwicklung ausgeführten Joche dem Magnetquerschnitt der Bandwicklung eines Kernschenkels entspricht.To solve this problem, an electromagnetic device for use in power circuits operated at high frequency, for example a transformer or a choke coil, is produced using amorphous magnetic material, whereby according to the invention, to achieve a compact structure and a low weight, each as a tape winding made of amorphous tape Yoke designed as a magnetic material is arranged on each of the two end faces of core legs, the core legs also being designed as a tape winding made of amorphous tape made of magnetic material and the magnetic cross section of the yokes designed as a tape winding corresponds to the magnetic cross section of the tape winding of a core leg.

Ausführungsbeispiele der Erfindung werden anhand einer Zeichnung näher erläutert. Im einzelnen zeigen:

  • Fig. 1 und 2 Draufsicht, Ansicht und Schnitt eines bekannten zweischenkeligen Transformators,
  • Fig. 3 und 4 Draufsicht, Ansicht und Schnitt eines erfindungsgemäßen Transformators mit schmalen Jochen,
  • Fig. 5 einen Jochwickel in einer Fertigungszwischenstufe,
  • Fig. 6 und 7 Draufsicht und Ansicht eines erfindungsgemäßen Transformators mit überbreiten Jochen,
  • Fig. 8 eine weitere Variante mit überbreiten Jochen,
  • Fig. 9 und 10 Draufsicht und Ansicht eines dreiphasigen Transformators in erfindungsgemäßer Ausführung mit einer Kernschenkelanordnung als Tempeltyp und
  • Fig. 11 und 12 Draufsicht, Ansicht und Schnitt eines erfindungsgemäßen Transformators mit einer Kernkühleinrichtung.
Embodiments of the invention are explained in more detail with reference to a drawing. In detail show:
  • 1 and 2 plan view, view and section of a known two-legged transformer,
  • 3 and 4 top view, view and section of a transformer according to the invention with narrow yokes,
  • 5 a yoke winding in an intermediate production stage,
  • 6 and 7 top view and view of a transformer according to the invention with wide yokes,
  • 8 shows a further variant with wide yokes,
  • 9 and 10 plan view and view of a three-phase transformer in the inventive design with a core leg arrangement as a temple type and
  • 11 and 12 top view, view and section of a transformer according to the invention with a core cooling device.

Einander entsprechende Bauteile sind in allen Figuren mit gleichen Bezugszeichen versehen.Corresponding components are provided with the same reference symbols in all figures.

In einem Transformator gemäß den Fig. 3 und 4 sind als Bandwicklung ausgeführte Joche 32 vorgesehen, die mit beiden Seiten von säulenartigen als Bandwicklung ausgeführten Kernschenkeln 1 gekuppelt sind. Die Joche 32 sind durch seitliches Zusammenpressen eines Ringes 6 hergestellt, der seinerseits aus amorphem Band als magnetischem Werkstoff durch Aufwickeln auf einen geeigneten Wickelkern 5 gemäß Fig. 5 gefertigt und durch seitliches Pressen in eine ovale Form gebracht ist. Die Kernschenkel 1 sind ebenfalls durch Wickeln von amorphem magnetischem Band als Eisenkernwerkstoff auf den Umfang eines geeigneten Wickelkernes 4 hergestellt.In a transformer according to FIGS. 3 and 4, yokes 32 designed as a band winding are provided, which are coupled to both sides of columnar core legs 1 designed as a band winding. The yokes 32 are produced by laterally compressing a ring 6, which in turn is made of amorphous tape as a magnetic material by winding onto a suitable winding core 5 according to FIG. 5 and is brought into an oval shape by lateral pressing. The core legs 1 are also produced by winding amorphous magnetic tape as an iron core material on the circumference of a suitable winding core 4.

Primär- und Sekundärwicklungen 2 umgeben den Umfang der säulenartigen Kernschenkel 1. Da der Magnetwechselfluß das amorphe Band in jeder Wickelrichtung gleich gut durchdringt, ist dies auch an der Berührungsstelle der säulenartigen Kernschenkel mit den ovalen als Bandwicklung ausgeführten Jochen 32 der Fall und die durch den Magnetwechselfluß verursachten Wirbelstromverluste in dem aufgewickelten Eisenkernwerkstoff sind fast verschwunden, so daß die sonst übliche Verringerung des Wirkungsgrades und der Temperaturanstieg verringert sind. Da die Breite B2 der Joche 32 an der Berührungsstelle mit den Kernschenkeln mindestens gleich deren Durchmesser D ist, ist die Höhe H2 der Joche 32 bei diesem Ausführungsbeispiel kleiner als die Höhe Hl bei dem konventionellen Transformator gemäß Fig. l. Diese Verringerung der Höhe ist durch die überlegenen magnetischen Eigenschaften des amorphen Werkstoffs über die entsprechenden Eigenschaften von siliziumlegiertem Transformatorblech möglich.Primary and secondary windings 2 surround the circumference of the columnar core legs 1. Since the alternating magnetic flux penetrates the amorphous ribbon equally well in every winding direction, this is also the case at the point of contact of the columnar core legs with the oval yokes 32 designed as ribbon winding and that due to the alternating magnetic flux Eddy current losses caused in the wound iron core material have almost disappeared, so that the otherwise usual reduction in efficiency and the temperature rise are reduced. Since the width B 2 of the yokes 32 at the point of contact with the core legs is at least equal to their diameter D, the height H 2 of the yokes 32 in this exemplary embodiment is smaller than the height H 1 in the conventional transformer according to FIG. 1. This reduction in height is due to the superior magne properties of the amorphous material possible via the corresponding properties of silicon alloy transformer sheet.

Bei den Ausführungsbeispielen gemäß Fig. 6 bis 8 ist die wirksame Breite B4 der gewickelten Joche 34a bzw. 34b soweit vergrößert, daß sie etwa gleich dem doppelten des Außendurchmessers D der säulenartigen Kernschenkel 1 ist. Die Vergrößerung der Breite B4 ist im Fall der Fig. 6 durch eine Verdopplung der Windungszahl des amorphen magnetischen Bandes für das Joch 34a erreicht und im Fall der Fig. 8 dadurch erzielt, daß das Joch 34b aus zwei Teiljochen zusammengesetzt ist, deren jedes etwa die gleiche Anzahl von Windungen des amorphen magnetischen Bandwerkstoffes aufweist, wie das Joch 32 in Fig. 3. Auf Grund der sehr breiten Ausführung der Joche 34a bzw. 34b ist die Höhe H4 auf die Hälfte des Wertes der Höhe H2 beim Ausführungsbeispiel gemäß Fig. 4 reduziert, so daß der Transformator im ganzen sehr kompakt ausführbar ist.In the exemplary embodiments according to FIGS. 6 to 8, the effective width B 4 of the wound yokes 34a and 34b is increased to such an extent that it is approximately twice the outer diameter D of the columnar core legs 1. The enlargement of the width B 4 is achieved in the case of FIG. 6 by doubling the number of turns of the amorphous magnetic tape for the yoke 34a and in the case of FIG. 8 by the yoke 34b being composed of two partial yokes, each approximately has the same number of turns of the amorphous magnetic strip material as the yoke 32 in FIG. 3. Due to the very wide design of the yokes 34a and 34b, the height H 4 is half the value of the height H 2 in the exemplary embodiment according to FIG 4 reduced, so that the transformer can be made very compact overall.

Beim Ausführungsbeispiel gemäß Fig. 9 sind drei säulenartige als Bandwicklung aus amorphem Band aus magentischem Werkstoff hergestellte Kernschenkel 1 vorgesehen, von denen jeder von ein oder mehreren Wicklungen 2 umfaßt ist. Bei diesem Ausführungsbeispiel sind die drei Kernschenkel 1 auf den Ecken eines Dreiecks aufgestellt und die Stirnseiten mindestens der Kernschenkel 1 sind durch ein ebenfalls als Bandwicklung ausgeführtes dreieckiges Joch 35 abgedeckt. Die nach ihrem Einbau in den Transformator dreieckigen Joche 35 sind zweckmäßig ähnlich wie die vorhergenannten Joche auch zunächst auf einen Wickelkern mit kreisrundem Querschnitt aufgewickelt und erst hinterher durch seitliches Pressen in ihre endgültige Form gebracht. Die auch Tempeltyp genannte Ausführungsart von Transformatoren gemäß Fig. 9 und 10 mit den eine dreiseitige Säule bildenden Kernschenkeln 1 ermöglicht in Verbindung mit der erfindungsgemäßen Ausführung der Joche 35 eine besonders kompakte und bezogen auf die Nennleistung durch ein besonders niedriges Eigengewicht ausgezeichnete Ausführung für einen Leistungstransformator zum Einsatz in Hochfrequenzstromkreisen.In the exemplary embodiment according to FIG. 9, three column-like core limbs 1 are provided, which are made of amorphous tape from a magnetic material, each of which is surrounded by one or more windings 2. In this exemplary embodiment, the three core legs 1 are set up on the corners of a triangle and the end faces of at least the core legs 1 are covered by a triangular yoke 35, which is also designed as a band winding. The triangular yokes 35 after their installation in the transformer are expediently similar to the aforementioned yokes, initially also wound onto a winding core with a circular cross section and only afterwards lateral pressing brought into its final shape. 9 and 10 with the core legs 1 forming a three-sided column enables, in conjunction with the embodiment of the yokes 35 according to the invention, a particularly compact and, based on the nominal power, an excellent design for a power transformer due to a particularly low dead weight Use in high-frequency circuits.

Wird ein Transformator mit säulenähnlichen als Bandwicklungen ausgeführten Kernschenkeln 1 und ebenfalls als Bandwicklungen ausgeführten Jochen hergestellt, so ist es fertigungstechnisch sehr einfach mindestens in einem, vorzugsweise dem oberen, Joch 36a einen Spalt 7 vorzusehen, dessen Breite gleich dem Außendurchmesser des Wickelkernes für die Kernschenkel 1 ist. Dadurch ist Raum für sowohl die Kernschenkel 1 als auch das Joch 36a durchsetzende mit Kühlflüssigkeit gefüllte Kühlrohre 8 geschaffen, die auf ihrem oberhalb des Joches 36a liegenden Ende Kühlrippen 9 tragen. Durch diese Anordnung ist es möglich, die im Eisen auftretenden, durch das mit hoher Frequenz wechselnde Magnetfeld hervorgerufenen und in Wärme umgewandelten Verluste aus den säulenartigen Kernschenkeln 1 direkt aus deren Innerem nach außen abzuführen, so daß der Transformator sehr wirksam gekühlt und vor Temperaturanstiegen geschützt ist.If a transformer is manufactured with column-like core legs 1 designed as tape windings and yokes also designed as tape windings, it is very simple to manufacture, in terms of manufacturing technology, to provide a gap 7 in at least one, preferably the upper, yoke 36a, the width of which is equal to the outer diameter of the winding core for the core legs 1 is. This creates space for both the core limbs 1 and the cooling tubes 8 filled with cooling liquid and which pass through the yoke 36a and which carry cooling fins 9 on their end above the yoke 36a. With this arrangement, it is possible to dissipate the losses occurring in the iron, caused by the magnetic field changing at high frequency and converted into heat, from the columnar core legs 1 directly from the inside thereof, so that the transformer is very effectively cooled and protected against temperature increases .

Es ist auch möglich, die Rohre 8 so anzuordnen, daß sie die Kernschenkel 1 und die beiden Joche 36a und 36b durchdringen und dabei den gleichen Kühleffekt erbringen. In diesem Fall wird ein Teil der Breite der Joche durch die Rohre 8 beansprucht, so daß zur Wiederherstellung des erforderlichen Jochquerschnittes die Höhe H6 wieder etwas größer ausgeführt sein muß als die Höhe H2 beim Ausführungsbeispiel gemäß Fig. 4.It is also possible to arrange the tubes 8 so that they penetrate the core legs 1 and the two yokes 36a and 36b and thereby achieve the same cooling effect. In this case, part of the width of the yokes is claimed by the tubes 8, so that in order to restore the required yoke cross section, the height H 6 must again be made somewhat larger than the height H 2 in the exemplary embodiment according to FIG. 4.

Die vorstehende Beschreibung bezieht sich auf elektromagnetische Geräte zum Einsatz in mit Hochfrequenz betriebenen Leistungsstromkreisen und betrifft insbesondere Transformatoren und Drosselspulen mit säulenähnlichen Eisenkernschenkeln und Jochen aus amorphem magnetischem Bandwerkstoff. Die vorteilhaften Effekte der erfindungsgemäßen Anordnung von säulenartigen aus Band gewickelten Kernschenkel und der ebenfalls als Bandwicklung ausgeführten Joche lassen sich ohne Schwierigkeiten auch bei Verwendung von sehr dünnem Werkstoff mit niedrigen Ummagnetisierungsverlusten, beispielsweise mit entsprechend dünn ausgewalztem mit Silizium legiertem Stahlband oder mit Permalloyband erreichen.The above description relates to electromagnetic devices for use in high-frequency power circuits and relates in particular to transformers and inductors with column-like iron core legs and yokes made of amorphous magnetic strip material. The advantageous effects of the arrangement according to the invention of columnar core legs wound from tape and the yokes also designed as tape winding can be achieved without difficulty even with the use of very thin material with low magnetic reversal losses, for example with a correspondingly thinly rolled steel tape alloyed with silicon or with permalloy tape.

Zur Verwendung in mit Hochfrequenzströmen betriebenen Leistungsstromkreisen sind besonders vorteilhaft elektromagnetische Geräte einsetzbar, in denen Kernschenkel aus amorphem magnetischem Band und ebenfalls aus amorphem magnetischen Bandwerkstoff gewickelte Joche vorgesehen sind, wobei die Joche auf den beiden Seiten der säulenähnlichen Kernschenkel angeordnet sind, die auf ihrem Umfang Wicklungen tragen, und wobei der Magnetquerschnitt der Joche den Magnetquerschnitten der Kernschenkel entspricht. So aufgebaute elektromagnetische Geräte sind zur Verwendung in mit Hochfrequenz betriebenen Stromkreisen sehr kompakt und mit geringem Gewicht ausführbar, weil die Eisenverluste viel geringer sind als in herkömmlichen vergleichbaren Geräten. Darüber hinaus erlaubt die Anordnung von Kühlrohren in Spalten und Aussparungen der Joche und Kernschenkel die durch die Eisenverluste erzeugte Wärme unmittelbar nach außen abzuführen, so daß ein Temperaturanstieg im wesentlichen unterdrückt ist.For use in power circuits operated with high-frequency currents, it is particularly advantageous to use electromagnetic devices in which core legs made of amorphous magnetic tape and also made of amorphous magnetic tape material are provided, the yokes being arranged on both sides of the column-like core legs, which have windings on their circumference wear, and wherein the magnetic cross section of the yokes corresponds to the magnetic cross sections of the core legs. Electromagnetic devices constructed in this way are very compact and can be carried out with low weight for use in high-frequency circuits because the iron losses are much lower than in conventional comparable devices. In addition, the arrangement of cooling tubes in the gaps and recesses of the yokes and core legs allows the heat generated by the iron losses to be dissipated directly to the outside, so that an increase in temperature is substantially suppressed.

Claims (2)

1. Elektromagnetisches Gerät für mit Hochfrequenz betriebene Leistungsstromkreise, insbesondere Transformator oder Drosselspule, mit einem Eisenkern aus amorphem Band als magnetischem Werkstoff und mit Jochen (31), dadurch gekennzeichnet , - daß je ein als Bandwicklung aus amorphem Band als magnetischem Werkstoff ausgeführtes Joch (32, 34, 35 bzw. 36) auf jeder der beiden Stirnflächen von Kernschenkeln (1) angeordnet ist, - daß die Kernschenkel (1) ebenfalls als Bandwicklung aus amorphem Band als magnetischen Werkstoff ausgeführt sind und - daß der Magnetquerschnitt der als Bandwicklung ausgeführten Joche (32, 34, 35 bzw. 36) dem Magnetquerschnitt der Bandwicklung eines Kernschenkels entspricht. 1. Electromagnetic device for high-frequency power circuits, in particular transformer or choke coil, with an iron core made of amorphous tape as a magnetic material and with yokes (31), characterized in that - That a yoke (32, 34, 35 and 36) designed as a tape winding made of amorphous tape as a magnetic material is arranged on each of the two end faces of core legs (1), - That the core legs (1) are also designed as a tape winding made of amorphous tape as a magnetic material and - That the magnetic cross section of the yokes (32, 34, 35 and 36) designed as a tape winding corresponds to the magnetic cross section of the tape winding of a core leg. 2. Elektromagnetisches Gerät nach Anspruch 1, dadurch gekennzeichnet,
daß eine achsparallele mittige Aussparung (4) in den Kernschenkeln (1) und ein darüberliegender Spalt (7) in den Jochen vom Rohr eines Kühlers (8) durchsetzt sind.2. Electromagnetic device according to claim 1, characterized in
that an axially parallel central recess (4) in the core legs (1) and an overlying gap (7) in the yokes are penetrated by the tube of a cooler (8).
EP19840105853 1983-05-26 1984-05-22 Electomagnetic appliance for high-frequency power circuits, particularly a transformer or reactive coil Withdrawn EP0127119A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP93216/83 1983-05-26
JP9321683A JPS59218714A (en) 1983-05-26 1983-05-26 Electromagnetic apparatus for high frequency power circuit

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JP4997330B2 (en) 2010-07-27 2012-08-08 株式会社神戸製鋼所 Multiphase transformer and transformer system
WO2019092800A1 (en) * 2017-11-08 2019-05-16 三菱電機株式会社 Transformer and power conversion device
CN112614642B (en) * 2020-12-09 2022-04-12 安徽中富磁电有限公司 Combined type fixing and supporting structure for mounting magnetic core

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