Mini & Mainframe Power Requirements

From: Lawrence Walker <lwalker_at_mail.interlog.com>
Date: Mon Jan 19 11:04:36 1998

On 19 Jan 98 at 11:29, Don Maslin wrote:

> 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
> >
> >
 I used to treasure old electric dryer motors for lathes and such.
They have the starting power to initiate and then kick out to single
phase when up to speed.

ciao larry
lwalkerN0spaM_at_interlog.com
Received on Mon Jan 19 1998 - 11:04:36 GMT