Re: Any alternatives for conventional gasoline?

Josh Hill wrote:
On Mon, 12 Jun 2006 15:38:48 +0100, Pooh Bear
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:



Josh Hill wrote:


On Mon, 12 Jun 2006 11:23:39 +0100, Pooh Bear
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:


Josh Hill wrote:


Another possibility -- the batteries could be recharged as one drives
by induction.

Not possible. It's technically infeasible. Just somebody's funny idea based on a poor
understanding of physics/ / electricity.

Please tell me you're kidding: the technology to power electric cars
by induction has been available for years.

Can you elaborate ? I read the previous post as referring to 'induction coils' to recharge the
battery. The best kind of induction coil for energy transfer is a transformer of course. Coils
positioned in free air don't have remotely enough coupling to transfer any useful power.


The coils needn't be positioned in free air -- they can be wound on
cores.

Inductive charging paddles are already used on some battery-powered
vehicles. Here's a brief writeup of a proposal to charge electric
vehicles with coils under a driveway:

http://home.earthlink.net/~bdewey/EV_chargedebate.html

The proposals I've seen for inductive roadways posit a guidance system
that keeps the car centered in its lane (not sure how they handle snow
. . . ) I found a brief discussion here:

http://home.earthlink.net/~fradella/car.htm

Seems the DOT/DOE studied them, but I wasn't able to find the study
online, or much information of any kind -- most of the search results
I get are about induction motors.

And here's a (completely obvious, but what else is new) patent:

http://www.freepatentsonline.com/5311973.pdf


No way.

Any airgap spacing between cores of more than a few tens of mils utterly trashes the transferrable power.

Those induction charging paddles involve very small airgaps. Perhaps five mils. There is DIRECT PHYSICAL CONTACT between the paddle and the paddle receiver. Iron paths are seperated ONLY by the thinest of reasonable insulating dielectrics.

Ridiculously smaller than is even remotely possible on an air tired vehicle on a highway.

Induction highways are laughingly and ludicrously absurd both on cost and on engineering fundamentals.

--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email: don@xxxxxxxxxx

Please visit my GURU's LAIR web site at http://www.tinaja.com
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Relevant Pages

  • Re: Any alternatives for conventional gasoline?
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  • Re: Any alternatives for conventional gasoline?
    ... Inductive charging paddles are already used on some battery-powered ... vehicles with coils under a driveway: ... Those induction charging paddles involve very small airgaps. ... and practicality, ...
    (sci.energy.hydrogen)
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