[time-nuts] The home time-lab

[bownes]

Or the current version:

Large AC motor driving a LARGE flywheel with an AC (and/or -48VDC) generator on the other side feeding a very large battery plant. If mains drops more than 1/2 cycle it connects the turbine and starts it up. 

We had a 5MW one at $OLD_GIG for feeding our supercomputer factory. 

It was rumored that at least one customer location kept one of their turbines (redundant) idling at all times because they could not afford to loose a data set. 



> On Jul 25, 2016, at 09:55, Bob Camp <kb8tq at n1k.org> wrote:
> 
> Hi
> 
> 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? 
> 
> Bob
> 
> 
> 
>> On Jul 25, 2016, at 8:39 AM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
>> 
>> Chris wrote:
>> 
>>> I've never thought UPS were a good idea for anything but a computer
>>> that needs to shut down gracefully.   For your use you need something
>>> that cleans up the AC mains power.
>> 
>> A proper "online" (or "double conversion") UPS does just that.  It always provides cleanly-generated sine-wave power from a DC-AC converter.  Most will even deliver crystal-controlled power (i.e., non-synchronous with the AC line) in several frequency increments, if you desire, as well as a choice of regulated output voltages.  (For obvious reasons, they are usually operated synchronously.)
>> 
>> They are *much* more effective than ferroresonant supplies at removing glitches from the mains supply.
>> 
>> You must be referring to "offline" backup supplies.
>> 
>> Best regards,
>> 
>> Charles
>> 
>> 
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