Energy Sources

"Paul Cardinale" wrote in message
om...
Cut
Idiot. You know less about electricity and motors than does a goat.

Paul Cardinale

What kind? Billy or Mountain? Who cares anyway?

"Donald G. Shead" wrote in message igy.com...
"Paul Cardinale" wrote in message
om...
Cut
Idiot. You know less about electricity and motors than does a goat.

Paul Cardinale

What kind? Billy or Mountain?

Nanny.

Donald G. Shead wrote:
"Mark Fergerson" wrote in message
...

Donald G. Shead wrote:

(formerly)" dlzc1.cox@net wrote in message
news:_QV%a.4695$Qy4.4334@fed1read05...


An armature can also produce a more or less constant torque. No

"impulse"

is required.

David A. Smith



How David? Are you sure your not talking about a short circuit(;^?

Ever seen a homopolar motor? Dead short, no impulses,
plenty of torque. And don't quibble about magnets; ever seen
a self-exciting homopolar motor?

They sound like energy hogs; produce lots of heat?

They're the only true DC class of motors and generators,
and are very old (descended from the Faraday disk); I'm
surprised you're not familiar with them.

Download and read the relevant pdf from:

http://www.mae.ncsu.edu/courses/Mae5...r/reports.html

(middle of the page)

They can achieve 99% efficiency, but in high-power
applications they can generate a lot of heat since the rotor
current is basically across a dead short. Still, the USN is
very interested in them for nuke sub use mainly because they
make so little acoustical and electrical noise:

http://www.dt.navy.mil/pao/excerpts%...percond11.html

even considering that they're planning to go a
superconducting (LN, not LHe) rotor to eliminate the heat
generation, it's impressive as hell considering a rotor
current of over 40 kA. That's forty THOUSAND amperes. Note
that high currents at low voltage are typical for homopolar
motors.

Note also that for smaller motors one need not use fancy
electrodes (exotic and/or liquid metals) at the rim; back in
the "old days" Tesla devised a two-rotor setup with a
conducting belt connecting the two rotors' rims. I've seen
another that simply counter-rotated the rotors and let them
touch. In both designs the only rubbing contact was at each
rotor's hub.

Mind you some people are working on impulse-driven
versions for power storage purposes, but are having all
sorts of trouble because homopolars don't _like_ to operate
that way.

Mark L. Fergerson