[ausev] wireless charging

[Gary Ellis]

Most likely it will take this form:
http://www.powermatdigital.com

where a transmission plate can be embedded in the floor and devices will
receive their power when placed above these plates.  If economically
feasible, a large plate could span over every room in a house and all lights
and appliances would couple to it by just setting them down (with special
tables for those things that don't sit directly on the floor).

As for EVs, I think this will be the eventual trend -- allowing power plates
to be embedded in designated parking spots and our cars will couple to the
power source by simply parking over these spots.  A coupler may need to drop
down from the car to the ground for better efficiency, but the point is that
it will be simple, integrated and eliminate cords and exposed connections.
I think this is the only way EVs will be broadly accepted into our American
society -- i.e. there is no extra effort and they seem no different than any
other car.

In the short term, however, we still need to plug in and it would be good to
have public places where our cars could be recharged (e.g. grocery stores,
shopping malls, park & rides, etc.).  Has anyone tried to approach local
stores and restaurants about this?  I would only advocate talking to folks
who have existing outdoor outlets near their parking lots, rather than going
to the expense of installing anything new.

Thanks,

Gary



On Thu, Jan 22, 2009 at 7:21 AM, Joby Wieser <sleeper02_14_06 at yahoo.com>wrote:

>
> I have been confused by this technology. It seems like with all the
> interest in environmentally friendly, energy efficient solutions that this
> wireless charging would be a non starter.
>
> Can the magnetic resonant version ever be as energy efficient as a wire
> cable?
>
>
>
> No it can't.  When any kind of magenetic field travels through the air it
> looses strength exponentially with distance.  Thats why a 50,000 watts
> leaving a radio antenna is picked up by your receiver in the nanowatt range.
>
> Putting your cell phone on a pad to charge wont be too wastefull but the
> idea of powering all the appliances in a home without plugs would be very
> costly.
>
> Joby
>
>
>
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