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Nissan Exploring Inductive Charging Capable of Power Transfer Over Longer Distances for its Plug-ins

Guardian. Nissan is developing an inductive charging system capable of transmitting power wirelessly over longer distances, and is exploring scaling it up for use with its electric car.

Traditional magnetic induction, such as used in an electric toothbrush or electric transformers, uses conductive coils to transmit power wirelessly over very short distances. The two coils must be very close together, but do not make direct electrical contact.

Inductive charging with a paddle-type connector was used in a number of earlier EVs, notably GM’s EV1, the Nissan Hypermini EV, and the Toyota RAV4. GM and Toyota had cooperated on the development of a small paddle inductive charger (MagneCharge), and had separately begun production when in 2001, the California Air Resources Board decided to support a single, conductive standard for EV chargers in California. Subsequently, GM suspended production of its Gen2+ MagneCharge units in 2002.

Nissan has ambitions beyond mere wireless charging bays. It hopes to scale the technology up even further as a series of plates laid into the surface of designated electric vehicle lanes on our roads and motorways, theoretically enabling motorists to charge as they drive. However, Nissan admits that it still has no idea on how much it would cost, how long the designated lane would have to be, or how fast the battery could be recharged.

...Nissan is grappling with its recent consumer research, which revealed that 61% of potential electric car customers were most worried about the inconvenience of recharging. As well as inductive charging, its technological solutions include developing fast-charging facilities, which they hope to see in place in shopping car parks and motorway service stations.

According to the Guardian report, David Bott, director of innovation programs at the Technology Strategy Board, said that the fundamental science of inductive charging says that it will work, and theoretically could be used for on-the-go recharging in combination with a grid-recharge at night.

Bott said he was sceptical that such charging lanes would be practical: “It’s scientifically feasible, but it’s whether it’s scalable and feasible is another matter.”

Minoru Shinohara, a Nissan corporate senior vice president, had said in a presentation at the SAE World Congress in April this year that Nissan was experimenting with stationary and mobile wireless recharging.

A spin-off from MIT, WiTricity, is commercializing an innovative approach to longer-distance wireless charging. Developed by a team led by MIT Professor Marin Soljačić, the company’s technology is based on sharply resonant strong coupling, and is able to transfer power efficiently even when the distances between the power source and capture device are several times the size of the devices themselves. WiTricity says it can scale its technology to support applications requiring milliwatts to those requiring several kilowatts of power.




An interesting long term solution or option to extend e-range of PHEVs and BEVs. Basically, a midsize electrified vehicle could have unlimited e-range if it could pick-up about 1 Kwh every 5 miles travelled.

The mobile power picked-up could go to recharge the on-board batteries or directly to the e-motors. With reduced need to charge and discharge the on-board batteries, they could last much longer.

As in-road/street mobile recharge systems or network are expanded, e-vehicles could use much smaller batteries.

The same power system could keep the city e-buses, e-taxis, e-delivery vehicles etc going all day without a single recharge.

It may sound too good to be true but it is feasable and may even be economically justified for heavily travelled streets and roads + parking lots etc.

Can become an interesting economic recovery project for the next decade or two.


I proposed an inductive charging pad for garage use. There would be commumication between the charger and the car by wireless or infrared. You drive in, the light goes on and you are charging. I was told it would not work, or would cost too much...we will see.

Roger Pham

Inductive charging would be great for recharging BEV's at designated EV parking lots at work, shopping centers, and etc. "Look Ma! No wires"
This would greatly increase the public acceptance of the BEV's, in that battery durability will greatly increase with shallow depth of discharge, or smaller battery needed, and increase effective range.

Since magnetic field rapidly weakens with distance, an inductive pickup can be lowered from the bottom of the car to nearly touch the ground of the parking space where the magnetic field coil is embedded. A metal-detecting circuitry can be devised to allow for detection of the presence of the inductive pickup as it is being lowered from the parked car in order to start the charging process automatically. A toll-tag device may be needed to charge the car owner for the electricity used, unless this a "courtesy of the house" generosity in providing free electricity to encourge more usage of EV's.

Inductive charging in the roadway may not be too far-fetched, once BEV's equipped with inductive pickups like mentioned above will appear in sufficient numbers. Toll-tag device can be used to assess tolls as is in used in toll-roads today.


Here is a concept from Germany based on in-road systems.


With all the concern about stray EMFs as an environmental hazard, I predict that this will go exactly nowhere.

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