> Reminds me. The CDC Cyber 960 from http://www.cray-cyber.org/ runs at
> 400 Hz. The higher frequency allows smaller transformers.
I think the intent was to reduce the ripple, rather than reduce the
weight. CDC wasn't afraid of a few more pounds.
> The 400 Hz three phase current is generated by a motor-generator. The
> rotating mass of this machine is enough to keep the Cyber running for
> some seconds. (Power consumption of the Cyber at minimal configuration
> is around 20 kW.) Enough to start a big diesel generator in case of a
> power outage.
I doubt you could start a big diesel that fast, reliably.
The inertia would, however, protect against little dips and burps in the
power, when the utilities are fooling around with the grid.
William Donzelli
aw288_at_osfn.org
Received on Tue Dec 14 2004 - 17:41:46 GMT