Forget the plug: the future of electric vehicles is wireless
In short: We already charge our phones without cables, but scaling that technology to a two-ton electric vehicle seems impossible. However, a new method of magnetic resonance is making cord-free charging a reality, promising a world where you simply park your car and let the energy flow.
The transition from wired to wireless electric vehicle (EV) charging relies on a principle known as magnetic resonance. Unlike simple induction, this process uses specifically designed magnetic resonators—the power source and the vehicle's receiver—to transfer electricity through a magnetic near field. A complete system requires three essential parts: a power supply, a charging ground pad, and a receiver coil mounted on the vehicle. When the car is positioned over the pad, the supply sends electricity to the ground unit, which generates a magnetic field that the vehicle's coil then conducts to charge the battery.
One common concern with wireless systems is the need for precision. Many assume a driver would need to park with millimeter accuracy to initiate a charge, but the technology is more forgiving. Even if a vehicle is slightly off-center, it can still receive a full charge at maximum speed. For those using retrofit kits, integrated displays can help monitor the ground pad's position and guide the driver into the optimal stopping range.
While these systems are already accessible in Asian markets, they are expected to arrive in the US in the near future. For early adopters, retrofit kits will be necessary, though future models will likely come with wireless capabilities as factory-installed options. Cost-wise, the technology is becoming competitive; a system is expected to cost roughly $900, with installation adding approximately $1,500, making the total comparable to a Level 2 plug-in station. To address durability in harsh climates, engineers are developing concrete-based ground pads that sit flush with driveways, protecting them from damage by snow plows.
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- Summary by Intellect · source: Wireless EV Chargers | Future House | Ask This Old House
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