Re: (ET) Controllers

["Christopher Meier" <mr23 mn rr com>]

There is some information on this in the archive.
Search for postings by Rhett George (think spelling is correct).
-Chris

----- Original Message -----
From: "SteveS" <ssawtelle fcc net>
To: <elec-trak cosmos phy tufts edu>
Sent: Thursday, May 02, 2002 7:50 AM
Subject: Re: (ET) Controllers


> This topic is of interest to me as part of the reason I wanted an
Elec-Trak
> is to learn more about electric vehicles. I have seen some pretty 
> detailed
> discussion in here about motors and controllers, so it seems we have some
> knowledgeable people around.
>
> OK, now that I've buttered you up....
>
> It would probably be of general interest if someone would take the time 
> to
> write up a bit about the various motors used in the ETs and their
> construction (series, compound, etc). Topics like how field weakening
> increases speed, etc. would also be good. If there is a good reference
book
> out there, let me know. I've read up in a couple books, but don't even
know
> enough to be dangerous yet. Thinking about it now, a good place to start
> would be real information on the the actual motors we are dealing with. I
> tried to get info from GE but they replied back that basically they had 
> no
> information to give out.
>
> I hate to see that battery power wasted in those big resistors..... (I
know,
> go full speed).
>
> SteveS
> E12S
>
>
>
>
>
>
>
>
>
> ----- Original Message -----
> From: "SolidTech" <SolidTech qwest net>
> To: "'Elec-Trak List'" <>
> Sent: Thursday, May 02, 2002 12:36 AM
> Subject: (ET) Controllers
>
>
> > OK...  What really is the best way to have a controller operate?  I've
> been
> > looking back over some of the discussion and I see what appears to be
> > tradeoffs:
> >
> > - PWM uses the available power most efficeintly (and a controller could
be
> > designed that used field weakening for the higher speeds)
> >
> > - "Analog" control provides regen braking for those downhill grades
> >
> >   I've got a little experience building microcontroller (Intel) based
> > controllers, so I believe building one wouldn't be tooooooo difficult -
> but
> > the basic approach is what I'm wondering about right now.  It sounds
like
> > the larger EVs use series wound motors without separate connections for
> the
> > field, so we can't just use one of their controllers without serious
> > compromise.
> >
> > Thoughts?
> > - - joe
> >
> > Joseph Rock
> > E-15 & MagnaTrac Hydro 5000 in Colorado
> >
> >
> >
>