On Fri, June 8, 2012 1:23 pm, John Ferrell wrote:
> With Brushless Motors, the devil is in the details!
>
> Start up, timing, switching, loading, transients, noise (both electrical
> & audible) are all problems to address. Handling a hundred or so amps is
> OK, but a brush less the size of an alternator would likely be in the
> 4Kw-5hp range with Currents & voltages that are outside my normal
> bounds. I would guess that the form factor would dictate an In Runner
> which is inclined to be high revving, short power band...
> OTH, the more I learn. the more I find that I don't know... I wonder
> what electric vehicles are currently using... off to Google...

>From my discussions with some local EV builders, AC induction motors
(ACIM) are the most popular. Brushless motors use permanent magnets, and
at least the last time I surveyed the landscape, in the range of power an
EV needs, a brushless motor is just too heavy.

I'd love to see a car with each wheel powered individually with its own
hub-motor, but at least for now, the unsprung weight makes the vehicle
impractical (poor handling and the very real possibility of a pot-hole not
just bending a rim, but taking out a very expensive piece of your
drivetrain).

I would love to be shown just exactly how wrong I am.

Regards,

Matt Bennett
Just outside of Austin, TX
30.51,-97.91

The views I express are my own, not that of my employer, a large
multinational corporation that you are familiar with.
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.