<font size="2" face="Arial">You can search for "wifi-brid" (like hybrid) which is the concept that you're talking about. It seems that folks are giving up on inductively coupled tracks and looking at direct contact (like toy slot cars) with rail segments that are only live when a car is directly above them.<br>
<br>Gary<br><br></font><br><div class="gmail_quote">On Thu, Jan 22, 2009 at 8:59 AM, <span dir="ltr"><<a href="mailto:jefoy@mindspring.com">jefoy@mindspring.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I remember seeing some of this technology being discussed last year sometime. The concept is supposed to be for small devices, not large scale power transfer. It is one more example of trading convenience for efficiency or for a solution to an otherwise difficult packaging problem (nanomachines, biometric monitors, etc.) where placing a conventional battery would be difficult.<br>
<br>
If the efficiency can be raised to the 50%- 60% range I would think one practical application might me powered roadways. Imagine pulling your hybrid or all electric onto a freeway and being able to inductively pull power from a buried grid in the road surface. The perfect range extender, the power transferred could be monitor by RFID devices and you get billed at the end of the month for what you used from the roadway grid (like the toll tag).<br>
<br>
Jack<br>
<br>
-----Original Message-----<br>
>From: Steve Ross <<a href="mailto:sross1@austin.rr.com">sross1@austin.rr.com</a>><br>
>Sent: Jan 22, 2009 7:12 AM<br>
>To: 'AustinEV News Announcements and General Discussion' <<a href="mailto:ausev@austinev.org">ausev@austinev.org</a>><br>
>Subject: Re: [ausev] wireless charging<br>
><br>
>If the resonant frequency transfer was a wide field of energy, than anything<br>
>with a resonant receiver would be able to tap into the energy contained in<br>
>the filed. Would this allow you to charge a fleet of cars in the same<br>
>garage with one resonant generator? Since it is generating a constant field<br>
>of energy, would the generator be 'on' the entire time holding an energy<br>
>field open? What type of energy would the generator require to hold the<br>
>field open? Would this field be the same as an MRI machine in the hospital?<br>
>Can magnetism really be that tightly 'tuned' so it does not affect anything<br>
>else?<br>
><br>
>This could be a great way to charge up EV's just by parking them in the<br>
>garage and turning the field on. It could also charge onboard electronics<br>
>like phones and IPods left in the car. Wow, what a concept, too kewl.<br>
><br>
>Steve Ross<br>
><br>
>-----Original Message-----<br>
>From: <a href="mailto:tomsmail@wtez.net">tomsmail@wtez.net</a> [mailto:<a href="mailto:tomsmail@wtez.net">tomsmail@wtez.net</a>]<br>
>Sent: Wednesday, January 21, 2009 2:17 PM<br>
>To: AustinEV News Announcements and General Discussion<br>
>Cc: <a href="mailto:ausev@austinev.org">ausev@austinev.org</a><br>
>Subject: Re: [ausev] wireless charging<br>
><br>
>Who will volunteer to be the first person with a pacemaker (or laptop) to<br>
>walk thru one of these B fields? ;-)<br>
><br>
>Tom<br>
><br>
><br>
>--- <a href="mailto:mkohler@austin.rr.com">mkohler@austin.rr.com</a> wrote:<br>
><br>
>From: "Marc Kohler" <<a href="mailto:mkohler@austin.rr.com">mkohler@austin.rr.com</a>><br>
>To: "'AustinEV News Announcements and General Discussion'"<br>
><<a href="mailto:ausev@austinev.org">ausev@austinev.org</a>><br>
>Subject: Re: [ausev] wireless charging<br>
>Date: Wed, 21 Jan 2009 08:19:14 -0600<br>
><br>
>Gil, that's why I mentioned the magnetic resonance version.<br>
>It travels much farther than inductance and can only be "felt" when you have<br>
>a matching receiver tuned to that resonant frequency.<br>
>Marc<br>
><br>
>-----Original Message-----<br>
>From: <a href="mailto:ausev-bounces@austinev.org">ausev-bounces@austinev.org</a> [mailto:<a href="mailto:ausev-bounces@austinev.org">ausev-bounces@austinev.org</a>] On<br>
>Behalf Of Gil Dawson<br>
>Sent: Tuesday, January 20, 2009 6:31 PM<br>
>To: AustinEV News Announcements and General Discussion<br>
>Subject: Re: [ausev] wireless charging<br>
><br>
>> It looks like a mouse pad and can send power through the air, over<br>
>> a distance of up to a few inches. A powered coil inside that pad<br>
>> creates a magnetic field, which as Faraday predicted, induces<br>
>> current to flow through a small secondary coil that's built into<br>
>> any portable device, such as a flashlight, a phone, or a<br>
>> BlackBerry. The electrical current that then flows in that<br>
>> secondary coil charges the device's onboard rechargeable battery.<br>
>> (That iPhone in your pocket has yet to be outfitted with this tiny<br>
>> coil, but, as we'll see, a number of companies are about to<br>
>> introduce products that are.)<br>
><br>
>> We were able to transfer 60 watts with ~40% efficiency over<br>
>> distances in excess of 2 meters.<br>
><br>
>GM's EV1 and S-10E, and and Toyota's Rav4EVs all used Inductive<br>
>Coupling to transfer up to 6 kw for charging. The paddle is held by<br>
>a slot and springs rather closely to the coils, but there's still<br>
>perhaps 1/4 inch of play, so it is over some bit of distance.<br>
><br>
>Getting this technology to work over room-sized distances may be<br>
>feasible soon, even within an acceptable efficiency. But can you<br>
>imagine what it will take to get OSHA to approve people in the<br>
>workplace walking through a power transfer field?<br>
><br>
>--Gil<br>
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