Re: (ET) Controllers

["SteveS" <ssawtelle fcc net>]

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
>
>
>