Re: (ET) Controllers

[Bfayette aol com]

I would like to do this, too.  I would use one of the PICs that has a PWM 
interface.  I also have access to high amp IGBTs for real cheap.  My 
solution to the current limiting problem would be to use a 1000A device. 
As for the inductance problem, I had an ancient bipolar controller that I 
used on a Commutacar. The manual suggested that you use a separate 
inductor for non-series wound motors.  Something like an inductor for DC 
welding would probably be good.

Brad


In a message dated Thu, 2 May 2002 12:36:13 AM Eastern Daylight Time, 
"SolidTech" <SolidTech qwest net> writes:

>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
>
>
>


-- 
  Brad