Uninterruptible power supply with a variable speed drive driving a synchronous motor/generator
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United States of America Patent
Stats
-
Oct 1, 1991
Grant Date -
N/A
app pub date -
Apr 28, 1989
filing date -
Apr 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An uninterruptible power source is disclosed and claimed which includes a synchronous motor/generator assembly and a continuously on line variable speed drive connected to inductively accelerate the motor/generator assembly to near synchronous speed. When the motor/generator assembly reaches near synchronous speed, the motor/generator is switched to synchronous operation, while still under control of the variable speed drive. The variable speed drive is connected to maintain synchronicity with the motor/generator during acceleration. Resultantly, when switchover to synchronous operation occurs, no synchronization of the motor/generator to the variable speed drive is required. 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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