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Discussion Starter #1
I am sure they would help in Theory... But the Gain, from 85% to 95%
efficient motors and generators.... to 100% efficient, is a small
number, and MAY not be worth the expense of the special materials, and
cryogenics necessary..

That being said, I am sure there will be many uses for thes conductors
in the future...
--
Steven S. Lough, Pres.
Seattle EV Association
6021 32nd Ave. N.E.
Seattle, WA 98115-7230
Day: 206 524 1351
Cell: 206 850 8535
e-mail: [email protected]
web: http://www.seattleeva.org

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Discussion Starter #2
Steven, I recall a superconductive material (Ceramic?) announced over 12
years ago, that worked at near room temperatures, perhaps they might make
excellent field or stator windings. but would that reduce hysteresis loss
when changing polarity?
Regards,
Denis Miles
---------------------------------------------------------------------------------------------------------------------------
Steven Lough <[email protected]>wrote:

> I am sure they would help in Theory... But the Gain, from 85% to 95%
> efficient motors and generators.... to 100% efficient, is a small
> number, and MAY not be worth the expense of the special materials, and
> cryogenics necessary..
>
> That being said, I am sure there will be many uses for thes conductors
> in the future...
> --
> Steven S. Lough, Pres.
> Seattle EV Association
> 6021 32nd Ave. N.E.
> Seattle, WA 98115-7230
> Day: 206 524 1351
> Cell: 206 850 8535
> e-mail: [email protected]
> web: http://www.seattleeva.org
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>



--
Regards,
*Dennis Lee Miles* (Director) *E.V.T.I. inc*.
*www.E-V-T-I-Inc.COM <http://www.e-v-t-i-inc.com/> *(Adviser)*
EVTI-EVAEducation Chapter
*
Phone (863) 944 - 9913
Initial demand (computed by extrapolating the reservations for GM Volt and
Nissan Leaf,) shall exceed 200,000 vehicles in 2010 and 2011. However only
50,000 vehicles will be marketed, so a LARGE demand for Nice Newer
Conversions is predicted!
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Discussion Starter #3
"Near room temperature" is relatively speaking. The "high
temperature" superconductors work at liquid nitrogen temperature,
which is 77 Kelvin (-320 F.) The very highest temperature
superconductors work (barely) at something slightly like 133 Kelvin.

This was a BIG breakthrough because the before that,
superconductors required liquid helium (4.2 Kelvin) and needed to be
in the vicinity 10 to 18 degrees Kelvin to work at all. Thus,
relatively, 133 Kelvin is near room temperature in comparison to 4.2 Kelvin.

Liquid oxygen is 93 Kelvin, and would tend to work for the
high Tc superconductors, but LN2 is cheaper and safer to deal with.
Also, the farther below the critical temperature you go, the more
current and magnetic field they will withstand before going "normal"
and becoming resistive.

The reason they are impractical for most applications is
that the energy and cost required for the cryogenic refrigeration is
much more than the increase in performance of the conductor. A
counter example is if you need a huge volume, high power, and quiet
magnetic field, like in an MRI machine. The only way to get such a
large volume, quiet magnetic field without megawatts of electricity
and a river of water cooling is with a superconducting magnet. It is
then worth the cost and trouble of cryogenic cooling.

A motor on an EV is not worth making super conducting, until
they actually reach room temperature or very close to it. A motor on
a nuclear submarine could be a different story.....

Bill D.

At 06:27 PM 10/9/2010, you wrote:
>Steven, I recall a superconductive material (Ceramic?) announced over 12
>years ago, that worked at near room temperatures, perhaps they might make
>excellent field or stator windings. but would that reduce hysteresis loss
>when changing polarity?
>Regards,
>Denis Miles
>---------------------------------------------------------------------------------------------------------------------------
>
Steven Lough <[email protected]>wrote:
>
> > I am sure they would help in Theory... But the Gain, from 85% to 95%
> > efficient motors and generators.... to 100% efficient, is a small
> > number, and MAY not be worth the expense of the special materials, and
> > cryogenics necessary..
> >
> > That being said, I am sure there will be many uses for thes conductors
> > in the future...
> > --
> > Steven S. Lough, Pres.
> > Seattle EV Association
> > 6021 32nd Ave. N.E.
> > Seattle, WA 98115-7230
> > Day: 206 524 1351
> > Cell: 206 850 8535
> > e-mail: [email protected]
> > web: http://www.seattleeva.org
> >
> > _______________________________________________
> > | REPLYING: address your message to [email protected] only.
> > | Multiple-address or CCed messages may be rejected.
> > | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> > | OTHER HELP: http://evdl.org/help/
> > | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
> >
>
>
>
>--
>Regards,
>*Dennis Lee Miles* (Director) *E.V.T.I. inc*.
>*www.E-V-T-I-Inc.COM <http://www.e-v-t-i-inc.com/> *(Adviser)*
>EVTI-EVAEducation Chapter
>*
>Phone (863) 944 - 9913
> Initial demand (computed by extrapolating the reservations for GM Volt and
>Nissan Leaf,) shall exceed 200,000 vehicles in 2010 and 2011. However only
>50,000 vehicles will be marketed, so a LARGE demand for Nice Newer
>Conversions is predicted!
>-------------- next part --------------
>An HTML attachment was scrubbed...
>URL:
>http://lists.sjsu.edu/mailman/private/ev/attachments/20101009/cb34fd79/attachment.html
>
>_______________________________________________
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