Oak Ridge National Laboratory (ORNL) researchers wirelessly charged a light-duty passenger EV at 100 kW with 96% efficiency – a new milestone.
Scientists at the US Department of Energy-funded ORNL wirelessly charged the EV using polyphase electromagnetic coupling coils with rotating magnetic fields.
ORNL’s patented system transferred power to a Hyundai Kona EV across a five-inch air gap using electromagnetic fields, a process similar to the wireless charging of small consumer devices.
ORNL’s Omer Onar said:
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 researchers previously achieved a 120-kW charge using conventional coil technology in benchtop lab testing, but this marks a milestone achievement for vehicle integration using ORNL’s polyphase coils.
The polyphase electromagnetic coupling coil’s small, lightweight design allows for the highest power density within the smallest coils possible – they have a diameter of just over 14 inches. Rotating magnetic fields generated by the coil phase windings boost the power.
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For those who complain about wireless efficiency before reading the article: “researchers wirelessly charged a light-duty passenger EV at 100 kW with 96% efficiency – a new milestone”.
“This breakthrough achievement opens the door to fast and efficient wireless charging for passenger electric vehicles,” Onar added.
Read more: Volvo Cars says its new partner will reduce its EVs’ charging time by 30%
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