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Buses can be charged as they drive

The Korea Advanced Institute of Science and Technology has developed a pair of electric buses called Online Electric Vehicles or OLEV. These buses are different from your typical electric vehicles that have to be parked to recharge the batteries. Instead, they can recharge while driving down the road.
 
Electricity is sent to the bus via cables buried in the road with an 85% maximum power transfer efficiency rate (the wireless charging technology is able to supply 60 kHz and 180 kW of power at a stable and constant rate). There is a gap of just under seven inches between the underbody of the electric bus and the road surface. The charging system uses Shaped Magnetic Field in Resonance [PDF] to transfer power to the bus while it’s in motion.

 
The underbody of the bus has a receiving device that is able to convert the magnetic fields into electricity. The power strips needed to power the bus only cover 5 to 15 percent of the road surface, so only small sections of road have to be rebuilt to provide service.

Both of the OLEV buses are currently operating in the city of Gumi, South Korea. As of August 6, the buses are running an intercity route between the Gumi Train Station and In-dong district spanning 15 miles round-trip.
 
The technology used in the OLEV buses is an offshoot of tech used to power trams at an amusement park in South Korea.

Sources: Phys.org, KAIST





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