On Mon, 19 Jan 1998, William Donzelli wrote:
> > 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.
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
> 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_at_ans.net
>
>
donm_at_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
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Sysop - Elephant's Graveyard (CP/M) - 619-454-8412
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Received on Mon Jan 19 1998 - 13:29:00 GMT