Fast Wireless EV Charging? It’s Coming

It would be great if we could one day just park our electric vehicles and have them charge without plugging them in via a clunky cord. While wireless charging exists, even in the EV world, the size of the power transmitter for something smallish like, unfortunately, deliver rather slow rates of charging. That might not be reality for long if the latest demonstration by the Oak Ridge National Laboratory is anything to go by.

Tight air gaps and wieldy size are easy to achieve for, say, your phone, as you’re able to nearly place it directly on top of the transmitter. That’s not so easymost civilian EVs sit well off the ground . Adjustable-height air suspensions that can squat a car down to a charging pad or movable receivers are expensive, complex solutions to a problem afflicting something that is generally already too complex and expensive.

And it’s that reason the biggest innovation here is that this polyphase coil can produce bipolar electromagnetic fields on three-phase AC power with a 120-degree shift between each phase, allowing the transmitter to use three compact coil loops in two layers where most wireless chargers use single-phase AC power on a single “racetrack” transmitter.

Regardless, this was still an early demonstration of polyphase coils in a wireless EV charger within a lab-scale environment. The next step is to find what the challenges will be in mass production of a polyphase wireless power transmitter. Given what we already know about winding polyphase AC motors, this shouldn’t pose much of a problem or even add an unknown expense or challenge as there shouldn’t be a need to create new tooling for windings.

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