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ORNL polyphase coil technology reaches 100kW wireless power transfer for passenger vehicle

A team of researchers at Oak Ridge National Laboratory demonstrated that a light-duty passenger electric vehicle can be wirelessly charged at 100kW with 96% efficiency using polyphase electromagnetic coupling coils with rotating magnetic fields. (Earlier post.)

ORNL’s 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.

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ORNL’s lightweight polyphase electromagnetic coupling coil design, with a diameter just over 14 inches, allows for higher power density in smaller coils and includes rotating magnetic fields generated by coil phase windings. Credit: Genevieve Martin/ORNL, US Dept. of Energy


We’ve achieved the highest power density in the world for a wireless charging system for this class of vehicle. 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.

—ORNL’s Omer Onar

While researchers previously achieved a 120kW charge using conventional coil technology in benchtop lab testing, this marks a milestone achievement for vehicle integration using ORNL’s polyphase coils.

The polyphase electromagnetic coupling coil’s 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.

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