Method and apparatus for speed control switching of a change-pole motor

A method for switching back a change-pole motor to a lower speed, in which initially there is a two-phase switching back to the lower speed and in which on dropping below a specific switching current the third phase is switched in. The apparatus has an ammeter 1 in one of the phases switched in the...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	JOSEF SCHMIDT, WALTER TRUMPLER
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A method for switching back a change-pole motor to a lower speed, in which initially there is a two-phase switching back to the lower speed and in which on dropping below a specific switching current the third phase is switched in. The apparatus has an ammeter 1 in one of the phases switched in the two phase operation, a comparator 2 for comparing the actual current with the specific switching current value and a switch 3 in the third phase to be switched in. The switch 3 may be a triac (13, Fig 4) on two antiparallel thyristors (16, 17, Fig 5).