Recharge as you drive system.

[Hillhater]

Dont know how i missed this.....
http://evworld.com/news.cfm?newsid=30957

South Korea has rolled out the world’s first road-powered electric vehicle network. The network consists of special roads that have electrical cables buried just below the surface, which wirelessly transfer energy to electric vehicles via magnetic resonance. Road-powered electric vehicles are exciting because they only require small batteries, significantly reducing their overall weight and thus their energy consumption. There’s also the small fact that, with an electrified roadway, you never have to plug your vehicle in to recharge it, removing most of the risk and range anxiety associated with electric vehicles (EVs)

 

[speedmd]

If it is as efficient as they say, it would make a great parking space charger also for station charging while stopped which they do quite often. Easier to tie into power sources off the main highways/ roadways also.

 

[torker]

I work on lighting and have worked on inductive lighting. I wonder what frequency it would be. Seems like it would cause lots of stray unwanted rf emission.

 

[friendly1uk]

I work on lighting and have worked on inductive lighting. I wonder what frequency it would be. Seems like it would cause lots of stray unwanted rf emission.

I guess higher frequencys are more efficient, but the magnitude of the wave gets smaller. The gap between loop and pickup will dictate the frequency range possible. My guess is 40khz but I would like to know some real facts.

 

[parabellum]

Same source. 20kHz

"Exact details of the system are hard to come by, but we believe that the power is delivered by cables that are around 12 inches (30cm) below the road surface. The power is transmitted wirelessly via Shaped Magnetic Field in Resonance (SMFIR), a technology developed by the Korea Advanced Institute of Science and Technology (KAIST) that essentially runs 100 kilowatts of power through some cables at a very specific frequency (20 kHz in this case), creating a 20 kHz electromagnetic field. The underside of the bus is equipped with a pick-up coil that’s tuned to pick up that frequency, and thus AC electricity is produced via magnetic resonance. (Read: How wireless charging works.) Transmission efficiency is an impressive 85% thanks to the “shaped” part of the technology, which targets the electromagnetic field at the vehicle, so that less energy is lost to the environment."