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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!zehntel!hplabs!hao!seismo!brl-tgr!tgr!munck@mitre-bedford
From: munck@mitre-bedford
Newsgroups: net.micro
Subject: Voltage protection for micros
Message-ID: <8296@brl-tgr.ARPA>
Date: Tue, 12-Feb-85 23:27:24 EST
Article-I.D.: brl-tgr.8296
Posted: Tue Feb 12 23:27:24 1985
Date-Received: Sat, 16-Feb-85 06:39:13 EST
Sender: news@brl-tgr.ARPA
Organization: Ballistic Research Lab
Lines: 18

> what you would do is find the cheapest 110/60 alternator you could,
> and a cheap electric motor, and build a GREAT BIG HEAVY mucking
> flywheel; drive the flywheel with the motor, then drive the alternator
> with the flywheel. 

Seems to me we ran an IBM 370/155 that way back in '73. I think it also
needed AC at something other than 60Hz; maybe 400?  Of course, this was
easy with the flywheel: just use a 400Hz generator. Maybe you could use
a 5V DC generator and eliminate your power supply.

  I question the "GREAT BIG HEAVY" flywheel.  Energy storage with
flywheels is going in the direction of relatively small, light wheels
made of exotic fibre materials and spinning at fantastic rates (100,000+
rpm) on magnetic bearings in a vacuum. Energy is added and taken out by
magnetic coupling.  Of course, it's all in an armored box to handle the
shrapnel when the wheel breaks up.  Consider what happens to the "BIG
HEAVY" wheel when a bearing seizes.
           -- Bob Munck, MITRE