Drehstrom -- Gleichstrom -- Steuersatz Mit Trockengleichrichter in Einwellen- Und Zweiwellenanordnung
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Die Drehzahl von Induktionsmaschinen mit Schleifringläufer lä t sich steuern, wenn man in den Läuferkreis der Induktionsmaschine eine ver- änderliche Fremdspannung einführt. Dies stö t auf Schwierigkeiten, da die Frequenz der Fremdspannung, die eine Hintermaschine liefert, mit der Frequenz der Läuferspannung übereinstimmen mu . Letztere ist aber drehzahlabhängig. Man kann also mit einer Hintermaschine nur steuern, wenn sich die Frequenz ihrer Klemmenspannung in der gleichen Weise mit der Drehzahl ändert oder die Läuferfrequenz drehzahlunabhängig gewan- delt wird. Gleichzeitig mu die Hintermaschine in der Lage sein, die an sie abgegebene Schlupfleistung entweder dem speisenden Netz oder der Welle der Induktionsmaschine wieder zuzuführen. Das Problem wird durch V&rwendung von Drehstromkommutator- oder Gleichstrom-Hintermaschi- nen gelöst. Im zweiten hier interessierenden Fall müssen also die Dreh- stromgrö en (Schlupffrequenz) in Gleichstromgrö en (Fr quenz Null) ge- wandelt werden, ehe sie der Hintermaschine zugeführt werden können. Die hierzu benutzten Umformer sind durch die historische Entwicklung bedingt. So führt der Weg vom Einankerumformer über den Quecksilber- dampfgleichrichter zum Trockengleichrichter [1 -. . 5J. Sinn dieser Arbeit ist es, das jüngste Entwicklungsstadium zu unter- suchen und zu beschreiben. Es ist zu prüfen, inwieweit der Trocken- gleichrichter seine Vorläufer ersetzen kann und inwiefern er besser oder schlechter ist. Um diese Vorhaben vollständig durchführen zu kön- nen, mu man zunächst grundsätzlich das Verhalten eines Drehstrom-Gleich- strom-Steuersatzes mit Trockengleichrichter untersuchen und anschlie- end die verschiedenen Steuerungsverfahren vergleichen. Die Arbeit umfa t die theoretische und experimentelle Untersuchung des Steuersatzes in Einwellen- und Zweiwellen-Anordnung, die beide in Abbildung 1.
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