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Stanford Developing Wireless Electric Car Charging System For Highways
Posted By Andrew Michler On February 2, 2012 @ 3:31 pm In automotive,Green Transportation,News,Renewable Energy | 3 Comments
While we used AC and wires to build a massive electrical grid in the 20th century, wireless energy  could be a game changer in the years to come. Researchers at Stanford  just announced that they are working on a way to charge moving electric vehicles  using a series of coils embedded in freeways . The system would power cars while they drive at full speed, effectively untethering the electric car from the plug and providing unlimited range at high efficiency.
The Stanford project was funded by the Global Climate and Energy Project , and it is an extension of a wireless charging system developed at MIT, which uses magnetic resonant inductive coupling  technology famously developed by Tesla in 1894. The technology takes advantage of the magnetic property of electricity by communicating energy between two copper coils which resonate at the same frequency. As one coil is charged, the other will absorb the resulting magnetic field and turn it back into electrical energy. So far we have seen this system used to charge parked cars , and now Stanford has proven that cars can be charged on the fly, eliminating one of the major concerns for electric transportation – limited range.
Two researchers proved that the coils could deliver 10 kilowatts of energy for 6.5 feet, and even more impressively the transfer of electricity is 97% efficient. Coils set into the road  could give vehicles enough energy to move while charging their batteries at the same time, making the whole exercise of charging an electric car completely hands-free. Because the coils are designed to be set in the middle of lanes, they could also help navigate driverless technologies as well.
The team’s breakthrough hinges upon their plan to set coils at 90 degree angles to the roadway, which eliminates interference from cars’ metallic bodies. The next step is to determine if the magnetic fields can adversely affect the human body and sensitive electronics. Tesla’s early discovery may still transform transportation in the 21st century.
+ Stanford 
Via Physorg.com 
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 wireless energy: http://en.wikipedia.org/wiki/Wireless_energy_transfer
 Stanford: http://news.stanford.edu/news/2012/february/wireless-vehicle-charge-020112.html
 electric vehicles: http://inhabitat.com/tag/electric-car/
 coils embedded in freeways: http://inhabitat.com/researchers-make-breakthrough-in-wireless-in-road-ev-charging/
 Global Climate and Energy Project: http://gcep.stanford.edu/
 resonant inductive coupling: http://en.wikipedia.org/wiki/Resonant_inductive_coupling
 charge parked cars: http://inhabitat.com/worlds-first-wireless-electric-car-charger-launched-in-uk/
 Physorg.com: http://www.physorg.com/news/2012-02-wireless-power-revolutionize-highway.html
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