DE1438412C

DE1438412C - Dreischenkhger transformer

Info

Publication number: DE1438412C
Application number: DE19621438412
Authority: DE
Inventors: Auf Nichtnennung Antrag
Original assignee: Basic, Producte Corp , Milwaukee, Wis (V St A )
Priority date: 1961-06-01
Filing date: 1962-06-01
Publication date: 1973-08-02

Description

Der Patentschutz erstreckt sich nur auf die Gesamtheit der Merkmale des Anspruchs.The patent protection extends only to the entirety of the features of the claim.

In der Zeichnung ist ein Ausführungsbeispiel veranschaulicht. Darin zeigt An exemplary embodiment is illustrated in the drawing. In it shows

F i g. 1 einen erfindungsgemäßen Transformator,F i g. 1 a transformer according to the invention,

F i g. 2 ein Schaltbild dieses Transformators,F i g. 2 a circuit diagram of this transformer,

F i g. 3 die Ausgangsspannung des Transformators gemäß F i g. 1 und 2 ohne Belastung undF i g. 3 shows the output voltage of the transformer according to FIG. 1 and 2 without load and

F i g. 4 die Ausgangsspannung bei voller Belastung. F i g. 4 the output voltage at full load.

Wie F i g. 1 zeigt, hat der Kern des Transformators äußere Schenkel 10 und einen mittleren Schenkel 12; letzterer gabelt sich in zwei Teile 13 und 14. Magnetische Nebenschlußpfade 15 und 16 mit Luftspalten liegen zwischen dem mittleren Schenkel und den beiden äußeren Schenkeln. Eine Primärwicklung 17 ist auf den unteren Abschnitt des mittleren Schenkels gewickelt. Ein erster Teil 18 a der Sekundärwicklung ist ebenfalls auf den unteren Schenkelabschnitt gewickelt. Die Gleichstrom-SteuerwicklungenLike F i g. 1 shows the core of the transformer has outer legs 10 and a middle leg 12; the latter forks into two parts 13 and 14. Magnetic shunt paths 15 and 16 with air gaps lie between the middle limb and the two outer limbs. A primary winding 17 is wrapped on the lower portion of the middle leg. A first part 18 a of the secondary winding is also wound on the lower leg portion. The DC control windings

19 und 20 sind auf die gabelförmigen Teile 13 und 14 gewickelt und mit entgegengesetzter Polarität angeschlossen. Ein zweiter Teil 18 b der Sekundärwicklung ist über die Gleichstrom-Steuerwicklungen 19,19 and 20 are wound on the fork-shaped parts 13 and 14 and connected with opposite polarity. A second part 18 b of the secondary winding is via the direct current control windings 19,

20 gewickelt. Die Gleichstrom-Steuerwicklungen 19, 20 sind so gewickelt und angeschlossen, daß die Grundfrequenz nicht in sie hineingelangen kann. Wird kein Gleichstrom-Steuerstrom eingespeist, dann fließt durch die Sekundärwicklung 18 α, 18 b ein magnetischer Fluß, der seinen Rückweg über die äußeren Schenkel 10 nimmt. Sind dagegen die Gleichstrom-Steuerwicklungen 19, 20 erregt, so daß sie den oberen Teil des mittleren Schenkels sättigen, dann geht der magnetische Fluß, der durch die Primärwicklung erzeugt wird, ganz oder teilweise durch die magnetischen Nebenschlußpfade.20 wrapped. The direct current control windings 19, 20 are wound and connected in such a way that the fundamental frequency cannot get into them. If no direct current control current is fed in, then a magnetic flux flows through the secondary winding 18 α, 18 b and returns via the outer legs 10. If, on the other hand, the direct current control windings 19, 20 are energized so that they saturate the upper part of the central leg, then the magnetic flux generated by the primary winding goes wholly or partly through the magnetic shunt paths.

Der zweite Teil 18 b der Sekundärwicklung ist so S ausgebildet, daß er im Sinne einer Spannungserniedrigung wirkt, d. h. die Ausgangsspannung am Ausgang 21 herabsetzt, wenn kein Steuergleichstrom durch die Gleichstromwicklungen fließt. Die Spannung, die von dem Teil 18 b geliefert wird, ist etwasThe second part 18 b of the secondary winding is designed so that it acts in the sense of a voltage decrease, ie reduces the output voltage at the output 21 when no control direct current flows through the direct current windings. The voltage of the part 18 b supplied, is somewhat

ίο höher als die Spannung, die von dem Teil 18 a zur Spannungserhöhung der Primärwicklung 17 geliefert wird. Ist also kein Steuerstrom vorhanden, dann ist die Ausgangsspannung niedriger als die Primärspannung. Fließt dagegen ein Steuerstrom durch die Gleichstromwicklungen 19, 20, dann wird die Wirkung des Teils 18 b herabgesetzt, bis bei vollem Steuerstrom die Summe der Spannungen des Primärteils 17 und des Teils 18 α an den Ausgangsklemmen 21 zur Verfügung steht.ίο higher than the voltage that is supplied by the part 18 a to increase the voltage of the primary winding 17. If there is no control current, the output voltage is lower than the primary voltage. If, on the other hand, a control current flows through the direct current windings 19, 20, the effect of part 18 b is reduced until the sum of the voltages of primary part 17 and part 18 α is available at output terminals 21 when the control current is full.

Bei einer praktischen Ausführung eines Netzspannungsreglers für 10 kVA ist die Länge des Kerns 25,4 cm, die Breite 17,9 cm und die Blechpakethöhe 7,62 cm. Die Primärwicklung 17 hat 234 Windungen, der Teil 18 a 30 Windungen und der Teil 18 b 50 Windüngen. Jede der beiden Gleichstromwicklungen hat 160 Windungen. Bei einer Netzspannung von 220 bis 250 Volt, einem Belastungsstrom, der zwischen Null und 45 Amp. schwankt, kann bei entsprechender Regelung des Steuerstromes die Ausgangsspannung genau auf 225 Volt gehalten werden. Die Kurvenform der Spannung ist praktisch sinusförmig, wie dies F i g. 3 für den Fall zeigt, daß keine Belastung vorhanden ist und F i g. 4 für den Fall der Vollast.In a practical version of a mains voltage regulator for 10 kVA, the length of the core is 25.4 cm, the width 17.9 cm and the laminated core height is 7.62 cm. The primary winding 17 has 234 turns, the part 18 a 30 turns and the part 18 b 50 turns. Each of the two DC windings has 160 turns. With a mains voltage of 220 to 250 volts, a load current that fluctuates between zero and 45 amps, the output voltage can be kept exactly at 225 volts if the control current is regulated accordingly. The waveform of the voltage is practically sinusoidal, as shown in FIG. 3 shows for the case that there is no load and F i g. 4 in the event of full load.

Hierzu 1 Blatt Zeichnungen 1 sheet of drawings

Claims

Claim:

Three-legged transformer with constant output voltage, with no legs between its outer legs and the center leg two magnetic shunt paths with an air gap are, in which transformer a section of the center leg is the primary winding carries, and another section of the center leg is split into two fork-shaped parts, the each carry a DC control winding, which are connected in series in opposite directions and through the the two fork-shaped parts are saturable with full DC excitation, characterized in that that a first part (27) of the secondary winding together with the primary winding (26) on the same section of the Middle leg (12) that a second part (28) of the secondary winding on the other section of the middle leg (12) is wound that the two parts (27, 28) of the secondary winding in opposite directions are wound to each other that the primary winding (26) with the secondary winding (27, 28) is connected in series like an autotransformer and that the second part (28) of the secondary winding has more turns than the first part (27) of the secondary winding.

The invention relates to a three-legged transformer with constant output voltage, two magnetic shunt paths between the outer limbs and the middle limb with an air gap are present, in which transformer a section of the central leg the Primary winding carries, and another section of the center leg split into two fork-shaped parts is, which each carry a DC control winding, which are connected in series in opposite directions and through the the two fork-shaped parts are saturable with full DC excitation.

In a known transformer of this type (see French patent specification 998 502, Fig.4) the entire secondary winding is wound on the other section of the center leg, being primary winding and the secondary winding are electrically separated from each other. This transformer is running the magnetic flux in whole or in part through the shunt path (it flows entirely through the shunt path, when the fork-shaped parts are fully saturated; it flows with partial saturation, but also when no current flows through the DC control winding, in part through the shunt path). As a result, the voltage on the secondary winding is relatively heavily dependent on the load is, and the more the more strongly the fork-shaped parts are saturated, so the less of the magnetism Flux can affect the secondary winding. In addition, the secondary winding is a Must have number of turns that is equal to the number of turns of the primary winding when the voltage on the secondary winding should be equal to the voltage on the primary winding, which is the case, if the transformer is only intended to keep the voltage constant. The number of turns and thus the space required by the transformer is relatively large. Correspondingly also lie high heating and high losses.

The invention is based on the object for the use of the transformer mentioned at the beginning in cases where the input voltage is between values below and above the desired output voltage fluctuates to train this so that the secondary voltage is less dependent on the load is and the transformer is designed to save space than the known.

According to the invention, this object is achieved in that a first part of the secondary winding is put together with the primary winding on the same section of the center leg that a second part the secondary winding is wound on the other section of the center leg that the two parts the secondary winding are wound in opposite directions to each other that the primary winding with the secondary winding is connected in series in the manner of an autotransformer and that the second part of the secondary winding has more turns than the first part of the secondary winding.

In this way it is achieved that the secondary voltage is less dependent on the load than in the known case, since the energy from the input side to the output side of the transformer only is transported to a part via the magnetic flux, because the input current flows in part through the transformer and is available on the secondary side. On the other hand it works all magnetic flux generated by the primary winding through the first part of the secondary winding and thus contributes to the transfer of energy. In addition, the two parts of the secondary winding can have a small number of turns, since it is only necessary to have a variable additional voltage build up either the voltage added to the primary winding or from this is deducted. The transformer according to the invention is therefore also smaller in its dimensions than the known. The heating and the losses are therefore also present in the transformer according to the invention less than the known.

It should be mentioned that there is also a three-legged transformer with adjustable output voltage is known (German patent specification 708 893), the outer leg of which over part of its length are fork-shaped, with one of the two fork parts each carrying a DC control winding a primary winding and a secondary winding that is electrically separated from this on the middle limb located and oppositely wound auxiliary windings in series with the secondary winding, which both have the same number of turns, are arranged on the two outer legs. Ever according to the ratio of the control currents through the two direct current control windings is determined by the A correction voltage is deducted or added to the voltage of the secondary winding. the The disadvantage of this transformer compared to the transformer according to the invention is that that the entire energy transport from the input terminals to the output terminals via the magnetic Flow occurs. The core and the number of turns of the transformer must be accordingly be larger than the transformer according to the invention.