Wireless Electricity Transmission Being Deployed to Power Korean Mass Transit
by Michael Keller
Korean trams and buses are moving away from overhead power wires and high-voltage third rails–literally.
Researchers at the Korea Advanced Institute of Science and Technology (KAIST) have made major advances in wireless power transfer for mass transit systems. The fruits of their labor, systems called On-line Electric Vehicles (OLEV), are already being road tested around Korea.
At it’s heart, the technology uses inductive coupling to wirelessly transmit electricity from power cables embedded in roadways to pick-up coils installed under the floor of electric vehicles.