Re: [time-nuts] The home time-lab
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 jimlux@earthlink.net
To: time-nuts@febo.com
Subject: Re: [time-nuts] The home time-lab
Message-ID: ec93c0e5-8f49-05e3-7042-917c179d594d@earthlink.net
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
- 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.
I remember the 91. The MG Produced 400Hz power. It is easier to build a linear power supply as it would use smaller transformers and need less filtering
The chilled water cooling was not the best idea because when they had to power down water would condense on the insides and they would have to wait for it to dry befor powering up
The CDC 6600 in the other room used freon and did not have that problem. You could power cycle it in maybe 15 minutes
But a water cool machine had tons of cold water inside after the power is removed
Bothe were antiques when I used them in early 80s
On Jul 26, 2016, at 10:01 AM, Francis Grosz fgrosz@otiengineering.com wrote:
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 jimlux@earthlink.net
To: time-nuts@febo.com
Subject: Re: [time-nuts] The home time-lab
Message-ID: ec93c0e5-8f49-05e3-7042-917c179d594d@earthlink.net
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
- 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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