[ausev] wireless charging

Thu Jan 22 15:38:24 GMT 2009

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.

Gary

On Thu, Jan 22, 2009 at 8:59 AM, <jefoy at mindspring.com> wrote:

> 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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