METHODS OF PROTECTING MOTORS DRIVEN BY VARIABLE FREQUENCY DRIVES AND VARIABLE FREQUENCY DRIVE SYSTEMS EMPLOYING THE SAME

METHODS OF PROTECTING MOTORS DRIVEN BY VARIABLE FREQUENCY DRIVES AND VARIABLE FREQUENCY DRIVE SYSTEMS EMPLOYING THE SAME

A converter of a variable frequency drive (VFD) is operated in a ramp-up mode to produce an AC output voltage for accelerating a motor. A loading of the converter is detennined concurrent with the ramp-up mode. Transfer of the motor to a bypassed mode is conditioned on whether the detennined loading...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: GRAY, DONOVAN, SIMMS, STAN REX, FARR, THOMAS A
Format: Patent
Sprache:eng ; fre
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:A converter of a variable frequency drive (VFD) is operated in a ramp-up mode to produce an AC output voltage for accelerating a motor. A loading of the converter is detennined concurrent with the ramp-up mode. Transfer of the motor to a bypassed mode is conditioned on whether the detennined loading in the ramp-up mode meets a criterion. In some embodiments, conditioning transfer to the bypassed mode comprises foregoing transition to the bypassed mode based on a comparison of the detennined loading to an underloading threshold.