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Wireless EV Charging Could Be Embedded in Highways

Stanford University researchers are working on a wireless EV charging technology that could eventually lead to highways that automatically charge vehicles as they drive over them. Such a technology could lead to a basically infinite range for EVs.

The wireless power transfer that the scientists are working on uses magnetic resonance coupling. Two copper coils are placed a few feet apart and tuned to resonate at the same frequency. One coil is connected to an electric current that generates a magnetic field that causes the other coil to it's cool buy cialis online without prescription resonate. This process leads to an electric current being transferred invisibly from the first coil to the second.

Previous studies have found the technology to be safe. The current is only transferred between the two in-tune resonators. People or objects standing near or between the coils would not be affected at all and even with obstacles in between, the two coils will still transfer the current without interruption.

MIT researchers have already been working on a stationary version of this technology for EV charging that transfers 3 kW to a parked car, but the Stanford researchers are taking the concept and modifying it to transfer 10 kW over a distance of 6.5 feet, or enough to charge an EV cruising down the highway. A series of coils connected to a current would be embedded in the cheap viagra tablet highway with a receiving coil installed on the bottom of an EV. The receiving coils would resonate as the car drove along the road, continuously feeding the battery.

After running different mathematical models, the researchers figured out that a coil bent at 90 degrees and attached to a metal plate can transfer 10 kW to a twin coil 6.5 feet away. They say the efficiency of this wireless power transfer is 97 percent!

The researchers have filed a patent and will now move on to testing it in labs and then in real-world driving conditions to how to find reputable canadian cialis make sure it's completely safe and doesn't have any negative affects on other cars or drivers. Check out a video explaing the technology above.

via Physorg

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Comments (14)Add Comment
written by justaguy, February 06, 2012
97% is a pretty good efficiency level but does this system of wireless charging need to operate continuously or do the where buy viagra transmitters go into a standby mode when there is no vehicle nearby? if there is no standby mode then this system will end up being an energy hog as it constantly tries to charge vehicles that arent there. anybody out there have any further info on the concept?
written by Jamie Irwin, February 06, 2012
Interesting blog, I have been following it for a while as it is very much down my alley.

The concept is a bit vague though, I'd love to hear more particularly about the energy efficiency.
my understanding
written by Fencerdave, February 06, 2012
This is a similar notion to Tesla's system of wireless energy transmission.

As such, the charging coils would always be resonating, regardless of whether something was being charged. However, unless the flow is being resisted (by the coil in the car as it charges), it is almost entirely "frictionless" to do this resonance and ordering cialis overnight delivery does not draw any significant amount of power.

This means that there will be some constant loss of order cialis online energy due to essentially macro-waving charged air particles back and forth, but as the article says this would be negligible and probably quite safe.
written by Simon, February 07, 2012
I understand from your comment that you have no scientific training. There would be very little energy transfer without a load (the load being the receiving coil).

I would be interested to know the frequency at which the coils are resonant. One certainly wouldn't want to be wearing anything which was resonant at an harmonic of the fundamental frequency.
recycling electronics
written by recycling electronics, February 07, 2012
I have felt for some time that eventual electrification of the motorways in this way was inevitable - the benefits for long distance travel with electric vehicles is obvious, and a charging system pretty straightforward to implement. The wireless transfer is not that new though, Tesla started things off a long time ago but since then the patents for witricity clearly demonstate the priciple.
Nice start, but only on major thoroughfares in town
written by Meower68, February 07, 2012
If your EV gets 5 miles / kWh (extremely efficient), 10 kW = 50 mph. Most vehicles don't do that well. As such, it would be great around town, but you would have to seriously slow down to have "infinite range" on the highway. Around here, you'd get run over and/or ticketed for holding up traffic at that speed.

Yes, it would be very nice around town. And it would significantly extend your range on the highway. And the efficiency is very nice. I can only guess that the other 3% turns into heat (the usual form of energy which didn't get converted to a useful form) which might help keep the roads free of ice in colder seasons. By all means, put this into use. But recognize, up front, that this will probably an "around town" application before it becomes a highway application.

I've been envisioning something like this powering busses, embedded in the pavement at bus stops, for a couple years. If the bus could pick up enough charge to travel a mile or so, every time it stopped, you wouldn't need an engine, you wouldn't need a large battery and you wouldn't need expensive support infrastructure built into every foot of every route. Adding the ability for personally-owned EVs to charge up while sitting at a stop light would be a logical next step. Giving those vehicles to ability to charge while in motion would be the next logical step. Highways would be further off.
Doubt it Will Happen
written by KenZ, February 07, 2012
It would absolutely affect people with pacemakers. Knowing several, they can't wear a simple heart rate monitor, go near high tension lines, etc. Magnetic interference is the levitra shop worst thing you can expose them to.
written by Fencerdave, February 07, 2012
Obviously I am a huge fan of Nikola's, and have been since primary school.

As much as I dislike the man, however, J.P. Morgan once made a very salient point when Tesla proposed the (very real) possibility of canadian pharmacy scam supplying the entire world with wireless power:
"If you are going to supply the world with wireless power, then where can I put the meter?"

I love the notion of universal power, but be prepared for cries of 'evil socialism' when you suggest who has to pay for the buy cialis super active online electricity...
Way ahead of you guys
written by Jordan Palmer, February 08, 2012
I've already got a working protoype, this is pretty basic technology.

I was keeping this idea on the down-low until I could build a full scale version, but I knew it would only be a matter of time before someone else came up with the same vision. Now that it's in the public domain, this is my two cents - for all it's worth.

To all the nay-sayers... don't kid yourselves, this will obviously happen at some point. yes, of course there are technical challenges, but they also said an airplane would never fly - this is what engineers and designers are for.

Addressing the pacemaker comment, a valid point, but there is a tech called EM shielding. The passenger area of a car would need to be shielded from electromagnetic radiation.

Another challenge is maximizing the charging interval (distance between coils imbedded in the road) Think of street lights, it wouldn't make any sense to put them any closer together than they had to be.

To the guy who said this is a socialist idea, you are so wrong. This is pure capitalism. Ever heard of a toll highway? or a power meter? or an RF ID tag? When you drive your car, you would get billed by the mile, or volt...

The real challenge is setting up the billion dollar infrastructure and geting the hydro people to work directly with the car people and government to get this idea off the ground.

Good luck. If you have any questions, hit me up.

Oh... and..
written by Jordan Palmer, February 08, 2012
For a car in motion, of course there is proximity switching. The source coil would be off until it delivers a burst of energy to a car passing directly overhead.

Having it at an intersection is a good idea though, and again, proximity switching.

This has already been done by HaloIPT
written by Cindy, February 14, 2012
This has already been done better (with broader range) and more efficiently by a company called HaloIPT who have 20 years of IP on Stanford.
well, maybe
written by Bob, February 18, 2012
The coil geometry sounds a little weird; "bent at 90 degrees"? I wonder what that's about. It's also one thing to transfer with 97% efficiency between two stationary coils, but I suspect the viagra sales in canada efficiency falls off when one coil is moving relative to the other. WRT to wasting power, unless the "road coils" are superconducting, there will be I^2R (resistive) losses at all times whether there are cars in the field or not. There will need to be some sort of proximity switching as was mentioned. One issue I wonder about is eddy currents. Having that plate on a car moving through a time-varying field at some arbitrary speed should make for some differential equations I wouldn't want to deal with. It will be interesting to see if they can control induced currents well enough that they can avoid unintended magnetic braking.
Powering the coil
written by BJohnson, February 19, 2012
Could you power the coils by piezoelectric effect, in which certain materials produce an electric current when compressed or bent imbeded in the highway?
written by Tim, March 06, 2012
This would work extremely well if an EV was built with the energy efficiency of the EV1. This road can supply 166 wh/mile to the car, or about half the energy required for the LEAF, doubling its range at 60 mph. If an EV got 200 wh/mile, you would have almost a 600 mile range with a 20 kw battery.

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