[ausev] wireless charging

[John Allen]

The article states the efficiency of the charging pad is 90%, not sure about
over the air at greater than 85 foot distances.

John T.

-----Original Message-----
From: ausev-bounces at austinev.org [mailto:ausev-bounces at austinev.org] On
Behalf Of jefoy at mindspring.com
Sent: Thursday, January 22, 2009 8:59 AM
To: AustinEV News Announcements and General Discussion; 'AustinEV News
Announcements and General Discussion'
Subject: Re: [ausev] wireless charging

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.

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). 

Jack

-----Original Message-----
>From: Steve Ross <sross1 at austin.rr.com>
>Sent: Jan 22, 2009 7:12 AM
>To: 'AustinEV News Announcements and General Discussion'
<ausev at austinev.org>
>Subject: Re: [ausev] wireless charging
>
>If the resonant frequency transfer was a wide field of energy, than
anything
>with a resonant receiver would be able to tap into the energy contained in
>the filed.  Would this allow you to charge a fleet of cars in the same
>garage with one resonant generator?  Since it is generating a constant
field
>of energy, would the generator be 'on' the entire time holding an energy
>field open?  What type of energy would the generator require to hold the
>field open?  Would this field be the same as an MRI machine in the
hospital?
>Can magnetism really be that tightly 'tuned' so it does not affect anything
>else?
>
>This could be a great way to charge up EV's just by parking them in the
>garage and turning the field on.  It could also charge onboard electronics
>like phones and IPods left in the car.  Wow, what a concept, too kewl.
>
>Steve Ross
>
>-----Original Message-----
>From: tomsmail at wtez.net [mailto:tomsmail at wtez.net] 
>Sent: Wednesday, January 21, 2009 2:17 PM
>To: AustinEV News Announcements and General Discussion
>Cc: ausev at austinev.org
>Subject: Re: [ausev] wireless charging
>
>Who will volunteer to be the first person with a pacemaker (or laptop) to
>walk thru one of these B fields? ;-)
>
>Tom
>
>
>--- mkohler at austin.rr.com wrote:
>
>From: "Marc Kohler" <mkohler at austin.rr.com>
>To: "'AustinEV News Announcements and General Discussion'"
><ausev at austinev.org>
>Subject: Re: [ausev] wireless charging
>Date: Wed, 21 Jan 2009 08:19:14 -0600
>
>Gil, that's why I mentioned the magnetic resonance version.
>It travels much farther than inductance and can only be "felt" when you
have
>a matching receiver tuned to that resonant frequency.
>Marc
>
>-----Original Message-----
>From: ausev-bounces at austinev.org [mailto:ausev-bounces at austinev.org] On
>Behalf Of Gil Dawson
>Sent: Tuesday, January 20, 2009 6:31 PM
>To: AustinEV News Announcements and General Discussion
>Subject: Re: [ausev] wireless charging
>
>> It looks like a mouse pad and can send power through the air, over  
>> a distance of up to a few inches. A powered coil inside that pad  
>> creates a magnetic field, which as Faraday predicted, induces  
>> current to flow through a small secondary coil that's built into  
>> any portable device, such as a flashlight, a phone, or a  
>> BlackBerry. The electrical current that then flows in that  
>> secondary coil charges the device's onboard rechargeable battery.  
>> (That iPhone in your pocket has yet to be outfitted with this tiny  
>> coil, but, as we'll see, a number of companies are about to  
>> introduce products that are.)
>
>> We were able to transfer 60 watts with ~40% efficiency over  
>> distances in excess of 2 meters.
>
>GM's EV1 and S-10E, and  and Toyota's Rav4EVs all used Inductive  
>Coupling to transfer up to 6 kw for charging.  The paddle is held  by  
>a slot and springs rather closely to the coils, but there's still  
>perhaps 1/4 inch of play, so it is over some bit of distance.
>
>Getting this technology to work over room-sized distances may be  
>feasible soon, even within an acceptable efficiency.  But can you  
>imagine what it will take to get OSHA to approve people in  the  
>workplace walking through a power transfer field?
>
>--Gil
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