Uninterruptible power supply with a variable speed drive driving

Details Uninterruptible power supply with a variable speed drive driving Uninterruptible power supply with a variable speed drive driving

1989-04-28

1991-10-01

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 46, 307 47, 307 66, 307 68, 322 29, 322 47, H02J 906

Patent

active

050536354

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.

REFERENCES:
patent: 4460834 (1984-07-01), Gottfried
patent: 4488198 (1984-12-01), Christen et al.
patent: 4517471 (1985-05-01), Sachs
patent: 4734626 (1988-03-01), Sutrina et al.
Power Systems & Controls, Inc., "Uninterruptible Power Systems for Computers", Series 760L, Oct. 1988.
"Theory of Operation Synchronous Brushless Motor", Kato Engineering, Jul., 1977.
Yaskawa Electric Mfg. Co., Ltd., Transistor Invertor, Varispeed-616HII Instruction Manual, No date.
IEEE Transactions on Industry Applications, vol. IA-23 No. 5, Sep./Oct. 1987, "A Low-Impedance Uninterruptible Power Technology for Nonlinear Critical Loads" by Klaus Sachs, R. W. Larson, D. P. Decoster, and Stanley Plato.

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