Re: (ET) Re: ET reliability

["RJ Kanary" <rjkanary nauticom net>]

   There was a later E-12 / E-14 that DID have a permanent magnet traction 
motor. The earlier E-12, and the E-12 S  had wound fields, but according to 
the diagrams are the only wound field motors that do not have a field 
winding in the armature circuit.

----- Original Message ----- 
From: "Chris Zach" <czach computer org>
To: "Dave & Deb" <daveb drizzle com>
Cc: <elec-trak cosmos phy tufts edu>
Sent: Wednesday, November 03, 2004 10:41 PM
Subject: (ET) Re: ET reliability


> Hm. I thought one of the E12 series had a PM motor. Must be thinking of 
> the E10 then.
>
> Chris
>
>
> Dave & Deb wrote:
>
> > E12S  no field at all?? what exactly do you mean?  I know it doesn't do
> > field weakening but it does have a field. Also I didn't think it's motor
> > was PM.  Can someone confirm?
> > thanks
> >
> > Dave
> > E12S
> > Seattle
> >
> >
> > > It's also the simplest. No field at all, PM motor, 3 speeds, etc.
> > > Technically the E8 and 10 are the uber-simplest (one speed, always on,
> > > etc) but that's not fair.
> > >
> > > My only question is would tossing it from fwd to reverse would still
> > > cause an arc on the push-pull contactors. Also could that eventually
> > > damage the PM field magnet?
> > >
> > > Chris
> > >
> > >
> > > Elie, Larry (L.D.) wrote:
> > >
> > >
> > > > I believe the E-12S has the most forgiving electronics and is the most
> > > > reliable.  It isn't the fastest, or the most efficient, but it's the
> > > > only tractor that you can put in reverse when going full forward that
> > > > won't burn something up.
> > > >
> > > > Larry Elie
> > >
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> > > Elec-trak cosmos phy tufts edu
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>
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