[time-nuts] The home time-lab
jimlux at earthlink.net
Tue Jul 26 00:04:58 EDT 2016
On 7/25/16 6:55 AM, Bob Camp wrote:
> If you go back far enough in time …. there is another alternative:
> Big rectifier bank, turning AC into DC, often off of multiple phases or sources.
> Big DC motor running into a fairly large flywheel.
> AC generator (or in some cases DC generators) running off of the shaft
> A tuning fork (yes state of the art timing) based control on the AC output frequency
> A saturated reactor control loop on the generator side, same thing on the motor side.
> Wonderfull stuff. State of the art UPS for your shipboard computer in 1962. Ear muffs anyone?
we had a system like this to turn 60 Hz into 50 Hz with a toothed belt
drive between synchronous motor and synchronous generator. It whined..
"Satan's Siren" is what we called it.
IBM mainframes used a similar scheme but I can't remember the details.
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