CH199540A - Device for lowering the open circuit voltage on direct current welding generators which are excited by means of alternating current via rectifiers. - Google Patents

Device for lowering the open circuit voltage on direct current welding generators which are excited by means of alternating current via rectifiers.

Info

Publication number
CH199540A
CH199540A CH199540DA CH199540A CH 199540 A CH199540 A CH 199540A CH 199540D A CH199540D A CH 199540DA CH 199540 A CH199540 A CH 199540A
Authority
CH
Switzerland
Prior art keywords
alternating current
excited
welding
lowering
open circuit
Prior art date
Application number
Other languages
German (de)
Inventor
Gesellschaft Fuer Elec Haftung
Original Assignee
Electrotech Erzeugnisse 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 Electrotech Erzeugnisse Gmbh filed Critical Electrotech Erzeugnisse Gmbh
Publication of CH199540A publication Critical patent/CH199540A/en

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  • Arc Welding Control (AREA)

Description

  

      Torrichtung    zur Erniedrigung der     Leerlanfspannung    an     Gleichstrom-Schweissgeneratoren,     die über Gleichrichter mittels     Wechselstromes    erregt werden.    Die Erfindung betrifft eine Vorrichtung  an Schweissgeneratoren, die über einen  Gleichrichter mittels Wechselstromes erregt  werden, welche bezweckt, die     Leerlaufspan-          nung    herabzudrücken, um eine Gefährdung  des Schweissers zu verhüten.  



  Erfindungsgemäss ist in die Wechsel  stromseite des Erregerkreises die Primärwick  lung eines Transformators eingeschaltet, des  sen Sekundärwicklung im Schweissstromkreis  liegt.  



  Die Erfindung soll anhand der     Zeichnung     beispielsweise erläutert werden.  



  M,     Fig.    1, ist ein     Drehstrom-Antriebs-          motor    für den Schweissgenerator G. An eine       Anzapfung    der     Ständerwicklung    des Motors  <B>31</B> ist über den Gleichrichter 1 und die Pri  märwicklung 2 eines Transformators 3 die  Erregerwicklung 4 des Generators G ange  schlossen. 5 ist ein regelbarer Widerstand.    Die Sekundärwicklung 6 des Transformators  3 liegt im     Schweissstromkreis    7.  



  Die Vorrichtung arbeitet folgendermassen:  Im Leerlauf ist der Schweissstromkreis 7  offen, der Transformator 3 ist also     sekundär-          seitig        unbelastet    und wirkt     praktisch    als  Drossel, das heisst     in    seiner Primärwicklung  tritt ein verhältnismässig hoher Spannungs  abfall auf, der     einen    grossen Teil der     Wech-          selstromspannung    aufzehrt.

   Der Schweiss  generator wird also nur verhältnismässig  schwach erregt und hat infolgedessen eine  kleine     Leerlaufspannung.    Sobald     derSchweiss-          stromkreis    geschlossen wird, wird der Trans  formator 3     sekundärseitig    um so mehr be  lastet, je geringer der Widerstand des  Schweissstromkreises ist; im Grenzfall des  Kurzschlusses     ist    die     Sekundärwicklung    des  Transformators 3 kurzgeschlossen. Dadurch  bricht die Spannung in der Primärwicklung  2 zusammen und auf die Erregerwicklung 4      des     Generators        entfällt        praktisch    die volle  Erregerspannung.

   Die Spannung des Schweiss  generators steigt also an und sinkt von einem  bestimmten Maximum an nach den bei  Schweissmaschinen bekannten Gesetzen bei  zunehmendem Schweissstrom mehr und mehr  ab.  



  In     Fig.    2 ist in Abhängigkeit vom  Schweissstrom J der     Erregerstrom    in der  Wicklung 4 und die Spannung E des     Gene-          rators    dargestellt.     E,    ist die     Leerlaufspan-          nung,        i,    ist der zugehörige     Leerlauf-Erreger-          strom.    Macht man die Primär- oder Sekun  därwicklung des Transformators 3 regelbar,  so kann man den Verlauf der     E-Kurve,    ins  besondere die Grösse der     Leerlaufspannung          E.,    einstellen.  



  Man kann an Stelle der     Sekundärwicklung          fi    eine der vom     Hauptstrom        durchflossenen     Wicklungen des     Schweissgenerators    verwen  den, z. B. kann man, wie in     Fig.    3 gezeigt  ist, neben den Wendepolen 8 den Eisenkern  3 des Transformators anordnen und mit der       Wendepolwicklung    9 verketten.    Unter     Umständen        kann    man den zur Er  regung dienenden Wechselstrom über     einen          Schleifringsatz    dem     Schweissgenerator    selbst  entnehmen.



      Gate direction for lowering the no-load voltage on direct current welding generators, which are excited by means of alternating current via rectifiers. The invention relates to a device on welding generators that are excited by means of an alternating current via a rectifier, the purpose of which is to reduce the no-load voltage in order to prevent the welder from being endangered.



  According to the invention, the primary winding of a transformer is switched on in the alternating current side of the excitation circuit, the secondary winding of which is located in the welding circuit.



  The invention is to be explained with reference to the drawing, for example.



  M, Fig. 1, is a three-phase drive motor for the welding generator G. A tap on the stator winding of the motor <B> 31 </B> is via the rectifier 1 and the primary winding 2 of a transformer 3, the excitation winding 4 of the Generator G connected. 5 is an adjustable resistor. The secondary winding 6 of the transformer 3 lies in the welding circuit 7.



  The device works as follows: When idling, the welding circuit 7 is open, the transformer 3 is therefore unloaded on the secondary side and acts practically as a choke, i.e. a relatively high voltage drop occurs in its primary winding, which consumes a large part of the AC voltage .

   The welding generator is therefore only excited relatively weakly and consequently has a small open-circuit voltage. As soon as the welding circuit is closed, the transformer 3 is loaded on the secondary side all the more, the lower the resistance of the welding circuit; In the borderline case of a short circuit, the secondary winding of the transformer 3 is short-circuited. As a result, the voltage in the primary winding 2 collapses and the field winding 4 of the generator has practically no full field voltage.

   The voltage of the welding generator thus increases and decreases more and more from a certain maximum according to the laws known in welding machines with increasing welding current.



  In FIG. 2, the excitation current in the winding 4 and the voltage E of the generator are shown as a function of the welding current J. E is the no-load voltage, i is the associated no-load excitation current. If you make the primary or secondary winding of the transformer 3 adjustable, you can adjust the course of the E curve, in particular the size of the open circuit voltage E.



  You can use one of the windings of the welding generator through which the main current flows in place of the secondary winding fi, e.g. B. as shown in FIG. 3, the iron core 3 of the transformer can be arranged next to the reversing poles 8 and linked to the reversing pole winding 9. Under certain circumstances, the alternating current used for excitation can be taken from the welding generator itself via a slip ring set.

 

Claims (1)

PATENTANSPRUCH: Vorrichtung zur Erniedrigung der Leer laufspannung an Gleichstrom-Schweissgenera- toren, die über Gleichrichter mittels Wechsel stromes erregt werden, dadurch gekennzeich net, dass in die Wechselstromseite des Er regerkreises die Primärwicklung eines Trans formators eingeschaltet ist, dessen Sekundär wicklung im Schweissstromkreis liegt. PATENT CLAIM: Device for lowering the no-load voltage on direct current welding generators which are excited by means of alternating current via rectifiers, characterized in that the primary winding of a transformer is switched on in the alternating current side of the excitation circuit, the secondary winding of which is in the welding current circuit. UNTERANSPRUCH: Vorrichtung nach dem Patentanspruch, dadurch gekennzeichnet, da.ss der die Erre gung speisende Wechselstrom über einen Schleifringsatz der Ankerwicklung des Schweissgenerators selbst entnommen ist. SUBCLAIM: Device according to the patent claim, characterized in that the alternating current feeding the excitation is taken from the armature winding of the welding generator itself via a slip ring set.
CH199540D 1936-11-17 1937-11-06 Device for lowering the open circuit voltage on direct current welding generators which are excited by means of alternating current via rectifiers. CH199540A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE199540X 1936-11-17

Publications (1)

Publication Number Publication Date
CH199540A true CH199540A (en) 1938-08-31

Family

ID=5757791

Family Applications (1)

Application Number Title Priority Date Filing Date
CH199540D CH199540A (en) 1936-11-17 1937-11-06 Device for lowering the open circuit voltage on direct current welding generators which are excited by means of alternating current via rectifiers.

Country Status (1)

Country Link
CH (1) CH199540A (en)

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