Method of controlling the starting, stopping and speed of an AC induction motor

A method for controlling the starting, stopping and operation of an AC motor (16) is provided. Each winding of the AC motor (16) is interconnected to an AC source (18) by a thyristor switch (42, 44, 46) and a bypass contactor (50, 52, 54) for providing voltage and current to the AC motor (16). The m...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	UNSWORTH, PETER JOSEPH, MOORE, GUY ALBERT, YOUNGER, CHARLES THEODORE
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY FUNCTIONAL ELEMENTS OF SUCH SYSTEMS GENERATION MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS PHYSICS REGULATING
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A method for controlling the starting, stopping and operation of an AC motor (16) is provided. Each winding of the AC motor (16) is interconnected to an AC source (18) by a thyristor switch (42, 44, 46) and a bypass contactor (50, 52, 54) for providing voltage and current to the AC motor (16). The method includes the steps of sequentially firing a pair of tyristor switches (42, 44, 46) to bring the AC motor (16) to full operating speed. Once at operating speed, the bypass contactors (50, 52, 54) are closed. Upon detection of a voltage drop across a thyristor switch (42, 44, 46), the thyristor switch (42, 44, 46) is fired immediately to transfer motor current from the bypass contactor (50, 52, 54) to the thyristor switch (42, 44, 46) in order to maintain voltage and current to the AC motor (16).