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Korean Electric Buses Recharge Wirelessly From Magnetic Coils Embedded in the Road

KAIST’s online electric vehicle (OLEV) system has already demonstrated trams that recharge themselves while circling city parks.

Today the OLEV system goes into operation on a regular commuter route in Gumi, a city in central South Korea. Two buses will ply the route, which has a roundtrip of 24 kilometers. By the end of the year, the city plans to add 10 more buses.

the buses in the KAIST system carry light, relatively inexpensive lithium-ion batteries but can keep on going indefinitely thanks to power beamed up to them from the road. That banishes a big bugbear of all-electric transport: range anxiety.

Underground coils produce a shaped magnetic field that resonates with receiving coils on the vehicle, transferring power so efficiently that only 5 to 15 percent of the roadway need carry the embedded gear. The buried coils save power another way, as well: they turn on only when they sense a properly equipped vehicle overhead.

Think of this next time you ride on a crappy American municipal bus.

(via Korean Bus Charges Itself While Driving - IEEE Spectrum)


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