Uninterruptible power supply with a variable speed drive driving an induction motor/generator
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United States of America Patent
Stats
-
Jan 14, 1992
Issued Date -
N/A
app pub date -
Jan 11, 1990
filing date -
Apr 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An uninterruptible power source includes an induction motor/generator assembly and a continuously on line variable speed drive connected to inductively accelerate the motor/generator assembly to near rated speed. When the motor/generator assembly reaches rated speed, the motor/generator is switched to synchronous operation, while still under control of the variable speed drive. The variable speed drive includes slip compensation to maintain the motor at rated speed. The variable speed drive operates in response to a utility power signal and to a standby power signal. When the utility power signal fails, operation of the drive is maintained, without interruption, by the standby power.
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