American Scientists Developed Wireless Charging Of A 100 kW EV With High Efficiency
Scientists from the US Oak Ridge National Laboratory (ORNL) demonstrated the operation of wireless charging for an electric vehicle with a power of 100 kW. The distance between the charger and the car was 12.7 cm
The device from ORNL has an efficiency of 96% and in practice was able to charge the Hyundai Kona EV.
The development of ORNL scientists differed from other similar systems in the transmission coils and principles of energy transfer. First, the transmission coil was made of silicon carbide, making it lighter and smaller. Secondly, the system generated a rotating electromagnetic field due to the operation of the coil in multiphase mode. The modified 100 kW unit was able to charge a Hyundai Kona EV battery to 50% capacity in less than 20 minutes through a 5-inch (12.7 cm) air gap with 96% efficiency.
“Our technology creates a power density [energy transfer] 8 to 10 times higher than conventional coil technology and can increase battery charge levels by 50% in less than 20 minutes,” the developers said. “This was achieved using multiphase electromagnetic transceiver coils because their design allows for the highest possible power density for small coils. The rotating magnetic fields created by these coils increase the power output of the unit.”
Wireless charging for electric vehicles looks promising in the future because it is the only alternative way to charge a car.
