Method and apparatus for switching back a change-pole motor

To enable a gentle switching back of a change-pole motor to a low speed while ensuring the full moment or torque on passing into motor operation, a method for switching back the change-pole motor to the lower speed is proposed wherein initially there is a two-phase switching back to the lower speed,...

Ausführliche Beschreibung

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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
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Beschreibung
Zusammenfassung:	To enable a gentle switching back of a change-pole motor to a low speed while ensuring the full moment or torque on passing into motor operation, a method for switching back the change-pole motor to the lower speed is proposed wherein initially there is a two-phase switching back to the lower speed, and wherein, on dropping below the predetermined switching current, the third phase is switched in. For this purpose, an ammeter is provided in the switched-in phase, with a comparator being provided for comparing the actual current with the predetermined switching current, and with a switch also being provided in the third phase to be switched in.