Re: Controllerless EV's

["Mike Shipway" <madmike@digizen.net>]

On 30 Sep 98 at 12:24, Robert McDonald carefully typed:
(regarding: Re: Controllerless EV's)

> I'll agree there is a lot of concepts involved and a lot of things I won't have
> even thought about yet, but I will be able to get help from professors and
> lecturers in my dept at uni, so it does not seem as daunting as if I were
> learning it all on my own.  I am not really trying to improve the design of motor
> controllers already available, I am really just trying to make something that
> does the job, for a lot less money, while learning a lot into the bargain.Thanks
> for your advice,
> Rob.

Definitely the way to learn.  That's why graduates who had summer internships 
get hired faster than pure book grads.

A suggestion of something to look at:
http://www.irf.com/technical-info/an941/an-941p3.htm
Which is an Application Note regarding parallelling MOSFETs.
It mentions several gott'chas.  I found it by searching for "Miller effect".
A fellow in the DC EV club got bitten by that particular gremlin several times.
As I recall, he said that the combination of high current and short pulse rise 
time could capacitively couple the transistor's leads to each other so that you 
couldn't turn it off!  I never heard if he resolve that one.
I'm afraid I don't remember his name.



Michael Shipway
Free range programmer, solar powered.
madmike@digizen.net