19 Jan
1998
19 Jan
'98
5:29 a.m.
On Mon, 19 Jan 1998, William Donzelli wrote:
Can't quarrel with that, but the price difference between an old 3-phase
induction motor and an MG set can be rather impressive!
- don
One scheme
that I have seen used to power a 3-phase motor (on a lathe or
such) is to connect a 3-phase motor of comparable rating or higher to the
single-phase mains and also connect all three phases to the motor to be
powered. The motor connected to mains is powered up - it may require a
twist to get it spinning - and when up to a steady speed, the lathe (or
whatever) motor may be powered up. I'm sure that there are some
inefficiencies, but I have seen it work.
Yes, it works, but is quite inefficient. I would venture to say that using
a real motor-generator would be better, if properly maintained. Motor-generators are not as bad as most people think -
a good one is
fairly efficient, provides isolation and regulation, and can take a lot of
electrical abuse. They are just bears to move (done it - not fun).
William Donzelli
william(a)ans.net
donm(a)cts.com
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Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives
Chairman, Dina-SIG of the San Diego Computer Society
Clinging tenaciously to the trailing edge of technology.
Sysop - Elephant's Graveyard (CP/M) - 619-454-8412
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