[EVDL List]

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[EVDL List]

[quote]On 19 Jun 2012 at 4:53, brucedp5 wrote:

> The project, 'Rapid design and development of a switched reluctance traction
> motor', will be led by ... [snip]
>
> SRMs use only the attraction between iron and an electromagnetic field
> ... They also traditionally suffer from acoustic ringing in the rotor.
>
> "One of the main challenges of the project will be to produce a torque-dense
> motor that is also quiet enough for use in luxury vehicles," conceded Cobham.

Wouldn't it have been more effective to fund development of something a bit
more goal-oriented, such as a "quiet motor that doesn't use rare earth
materials"? I might be jumping to conclusions, but it seems to me that such
a restricted project fairly reeks of meddling by science-ignorant
politicians.

David Roden - Akron, Ohio, USA
EVDL Administrator

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_______________________________________________
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| Please take those discussions elsewhere. Thanks.
|
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[EVDL List]

I agree; it seems like AC induction (which has previous success in
this application) or synchronous wound-field AC could be quite
promising.

Switched reluctance is nice because of how simple the rotor is, but it
seems like it's not as suited to high-performance applications as to
budget appliance applications.

That said, it's possible the researchers or companies involved are
interested/experienced with switched reluctance motors and want to try
to make them work for a high-performance vehicle application.

-Morgan LaMoore

[quote] EVDL Administrator <xxx@xxx.xxx> wrote:
> ...
> Wouldn't it have been more effective to fund development of something a b=
it
> more goal-oriented, such as a "quiet motor that doesn't use rare earth
> materials"? I might be jumping to conclusions, but it seems to me that=
such
> a restricted project fairly reeks of meddling by science-ignorant
> politicians.
>
> David Roden - Akron, Ohio, USA
> EVDL Administrator

_______________________________________________
| Moratorium on drag racing discussion is in effect.
| Please take those discussions elsewhere. Thanks.
|
| REPLYING: address your message to xxx@xxx.xxx.edu only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
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[EVDL List]

The most wonderful thing is that you can make larger diameter for the
rotor without bigger mass Rotor can be mostly hollow. Also the rotor
length can be stretched so the motor could fit in a conversion vehicle
transmission tunnel. Think about 3 feet long and 10 inch diameter 3
phase AC motor.

ABB was going to provide us the 1st SynRM motor for EV application but
they pulled out only weeks before delivery. There is still some issues
with the frequency converter SW.

-akkuJukka


http://www.google.com/profiles/jarviju#about


2012/6/19 Morgan LaMoore <xxx@xxx.xxx>:
> I agree; it seems like AC induction (which has previous success in
> this application) or synchronous wound-field AC could be quite
> promising.
>
> Switched reluctance is nice because of how simple the rotor is, but it
> seems like it's not as suited to high-performance applications as to
> budget appliance applications.
>
> That said, it's possible the researchers or companies involved are
> interested/experienced with switched reluctance motors and want to try
> to make them work for a high-performance vehicle application.
>
> -Morgan LaMoore
>
> On Tue, Jun 19, 2012 at 3:17 PM, EVDL Administrator <xxx@xxx.xxx> wro=
te:
>> ...
>> Wouldn't it have been more effective to fund development of something a =
bit
>> more goal-oriented, such as a "quiet motor that doesn't use rare earth
>> materials"? I might be jumping to conclusions, but it seems to me tha=
t such
>> a restricted project fairly reeks of meddling by science-ignorant
>> politicians.
>>
>> David Roden - Akron, Ohio, USA
>> EVDL Administrator
>
> _______________________________________________
> | Moratorium on drag racing discussion is in effect.
> | Please take those discussions elsewhere. Thanks.
> |
> | REPLYING: address your message to xxx@xxx.xxx.edu only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | CONFIGURE: http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
| Moratorium on drag racing discussion is in effect.
| Please take those discussions elsewhere. Thanks.
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I was under the impression that the very powerful and light weight motor in
the Tesla Roadster did not use rare earth elements. Is that not true?

-- Larry Gales

[quote] EVDL Administrator <xxx@xxx.xxx> wrote:

> On 19 Jun 2012 at 4:53, brucedp5 wrote:
>
> > The project, 'Rapid design and development of a switched reluctance
> traction
> > motor', will be led by ... [snip]
> >
> > SRMs use only the attraction between iron and an electromagnetic field
> > ... They also traditionally suffer from acoustic ringing in the rotor.
> >
> > "One of the main challenges of the project will be to produce a
> torque-dense
> > motor that is also quiet enough for use in luxury vehicles," conceded
> Cobham.
>
> Wouldn't it have been more effective to fund development of something a bit
> more goal-oriented, such as a "quiet motor that doesn't use rare earth
> materials"? I might be jumping to conclusions, but it seems to me that
> such
> a restricted project fairly reeks of meddling by science-ignorant
> politicians.
>
> David Roden - Akron, Ohio, USA
> EVDL Administrator
>
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--
Larry Gales
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[EVDL List]

[quote]brucedp5 wrote:
>> The project, 'Rapid design and development of a switched reluctance
>> traction motor', will be led by ... [snip] "One of the main
>> challenges of the project will be to produce a torque-dense motor
>> that is also quiet enough for use in luxury vehicles"

EVDL Administrator wrote:
> Wouldn't it have been more effective to fund development of something
> a bit more goal-oriented, such as a "quiet motor that doesn't use
> rare earth materials"? I might be jumping to conclusions, but it
> seems to me that such a restricted project fairly reeks of meddling
> by science-ignorant politicians.

I agree. We already have 100+ years experience making traction motors
that are quiet, reliable, and long-lived. Motors with rare earth magnets
are a recent innovation that only provided minor improvements in size
and efficiency.

PM motors can just as well be built with conventional magnets. In fact,
a *majority* of the PM motors already used in consumer products do not
use rare-earth magnets.

We can also use traditional wound fields. They are only a few percent
less efficient than PM motors at full load, and are actually *more*
efficient at light loads.

The GM EV1 used a traditional induction motor with no magnets at all.
Would you say its performance was somehow inadequate?

The way this article was worded makes me think that someone is "trolling
for dollars" to cure a problem that doesn't exist.
--
*BE* the change that you wish to see in the world.
-- Mahatma Gandhi
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart at earthlink.net

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