Jim,
IIRC, the IBM 360 mod 91 was one that used a MG set. I think it also
required chilled distilled water for cooling. Those were indeed the
days of "Big Iron".
Francis Grosz
>Date: Mon, 25 Jul 2016 21:04:58 -0700
>From: jimlux <[email protected]>
>To: [email protected]
>Subject: Re: [time-nuts] The home time-lab
>Message-ID: <[email protected]>
>Content-Type: text/plain; charset=utf-8; format=flowed
>On 7/25/16 6:55 AM, Bob Camp 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
>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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