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Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore!decvax!mcnc!duke!crm
From: crm@duke.UUCP (Charlie Martin)
Newsgroups: net.micro
Subject: Re: Voltage protection for micros
Message-ID: <5391@duke.UUCP>
Date: Sun, 10-Feb-85 13:38:03 EST
Article-I.D.: duke.5391
Posted: Sun Feb 10 13:38:03 1985
Date-Received: Wed, 13-Feb-85 01:35:25 EST
References: <8159@brl-tgr.ARPA>
Reply-To: crm@duke.UUCP (Charlie Martin)
Organization: Duke University
Lines: 21
Summary: 

There is a way to do an uninterupptible power supply that will work for
short periods that I have always wanted to try, but never had the
need/ambition...

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.  When the power was working OK, then you have a mechanical
loss between the line and the load -- so it costs a little more to run
the thing.  When the power changed over time (voltage or freq) then the
flywheel's inertia would smooth the change.  In addition, stored energy
of rotation would provide a short-term source of power which would keep
you up at least long enough to save and shut down.

I've never tried it, as I said -- if you do and it works, let me know.

-- 
		Opinions stated here are my own and are unrelated.

				Charlie Martin
				(...mcnc!duke!crm)