Novel Technology Reaches 100-kw Wireless Power Transfer For Passenger Vehicle.

A team of researchers at Oak Ridge National Laboratory (ORNL), a federally funded research and development centre inTennessee, USA,demonstrated that a light-duty passenger electric vehicle can be wirelessly charged at 100 kW with 96% efficiency using polyphase electromagnetic coupling coils with rotating magnetic fields.

ORNLs patented system transferred power to a Hyundai Kona EV across a five-inch airgap using electromagnetic fields, a process similar to the wireless charging of small consumer devices.

Weve achieved the highest power density in the world for a wireless charging system for this class of vehicle, ORNLs Omer Onar said. Our technology reaches power densities 8 -10 times higher than conventional coil technology and can increase battery charge state by 50% in under 20 minutes.

While researchers previouslyachieved a 120-kW chargeusing conventional coil technology in benchtop lab testing, this marks a milestone achievement for vehicle integration using ORNLs polyphase coils.

The polyphase electromagnetic coupling coils lightweight and small design allows for the highest power density within the smallest coils possible. Rotating magnetic fields generated by the coil phase windings boost the power.

This is a breakthrough achievement and opens the door to fast and efficient wireless charging for passenger electric vehicles, Onar said.Founded in 1943, the laboratory is now sponsored by the United States Department of Energy.

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