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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!wlcrjs!rhesmith
From: rhesmith@wlcrjs.UUCP (Richard H. E. Smith II)
Newsgroups: net.micro
Subject: Motor-generators as UPS
Message-ID: <583@wlcrjs.UUCP>
Date: Mon, 18-Feb-85 20:36:03 EST
Article-I.D.: wlcrjs.583
Posted: Mon Feb 18 20:36:03 1985
Date-Received: Thu, 21-Feb-85 07:06:07 EST
Reply-To: rhesmith@wlcrjs.UUCP (Richard H. E. Smith II)
Organization: chi-net, Public Access UN*X, Chicago IL
Lines: 27

>> 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.

>Oh, no!  Let's please not bring back the MG (motor-generator).  I
>listened to the racket of those infernal things for enough years
>back in the "good ol' days".

>	Most bearing types will give ample warning that they are going to
>seize. this can be high heat or shrilling or in real bad cases, smoke.

Ah, history.  I was privileged [;-}] to be able to pull the BIG RED HANDLE on
the front of the IBM 7094's console, when smoke started coming out of the
motor-generator set box!  This box usually made a noise about like a jet
plane, but exhaust was non-normal.  For the record, the motor and the generator
were each just big enough to straddle, like an electric horsie: about 75 amps
at 220-3phase, I think.

The generator bearing was welded to the shaft.  After the generator shaft
was turned back to roundness, it took a week to shake all the bugs out of
the cpu.

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Dick Smith						..ihnp4!wlcrjs!rhesmith