Hmmm, my instant reaction was 'extremely unlikely' as you would need a
'receiver' circuit with the right resonant frequency to generate any sort
of significant energy. That said, it is, I suppose, quite feasible that
with the mass of coils of one sort or another that there are 'out there'
that some fluke of chance may just throw up a matching resonant situation
and then, who know's what could happen. It's a bit improbable though.
Certainly simple metal objects such as you mentioned will *not* be an issue.
On the other hand, interestingly, the power used by the flux generating
coils in a large, whole body MRI scanner is about the same as that which
this inductive charger will use, ~7kW. As I suspect you know, these MRIs
come with all sorts of dire warnings about keeping metal objects out of the
way lest they turn into lethal projectiles. Fortunately, the MRI coils are
designed to do something completely different to the inductive charger and
so this issue is unlikely to be important. Also, the fixed coils energy
will only be 'live' when a car is charging so, again, it is improbable that
with the car in the way, anything would be able to get into a position
where something unexpected would occur. It will be interesting to see how
this all pans out. MW
On 17 Jul 2014, at 13:30, robert winfield via EV wrote:
will it induce eddy currents in metallic jewelry or clasps or such in
clothing worn by occupants.
(My car warms me before we leave in the morning...)
--------------------------------------------
On Thu, 7/17/14, brucedp5 via EV <ev@lists.evdl.org> wrote:
Subject: [EVDL] EVLN: BMW&Daimler developing 3-Hour Wireless Inductive
EVSE for i3 EV
To: ev@lists.evdl.org
Date: Thursday, July 17, 2014, 4:58 AM
Wireless EV Charging on the Horizon, But is It Safe?
http://www.digitaltrends.com/cars/cables-needed-bmw-daimler-working-wireless-charging-technology-evs/
No cables needed: BMW and Daimler working on wireless
charging technology
for EVs
By Andrew Hard — July 11, 2014
[image
http://icdn2.digitaltrends.com/image/rsz_p90155654.jpg
Wireless Charging Technology
]
With the help of BMW and Daimler, electric vehicles are
taking the next step
toward worry-free ownership.
The German automakers recently announced a joint effort to
develop a
wireless charging system for the i3 electric vehicle and i8
plug-in hybrid.
EVs don’t need oil changes, filter replacements, or
emissions testing, so
they’re already extremely convenient to own. If the
inductive wireless
charging technology is viable, EV owners won’t even need
to worry about
refueling.
BMW and Daimler’s charging tech works in the same way
wireless cell phone
chargers do, just on a larger scale. An alternating magnetic
field transmits
energy between two sets of coils: one mounted onto the
car’s parking area
(usually a garage floor), and a secondary coil on the
vehicle itself.
The array transmits energy at a charging rate of 3.6
kilowatts, which,
according to BMW, is enough to fully charge an i8 in under
two hours. The
German engineers predict they can increase that rate to 7.0
kW in the
future.
The circular design of the coils comes in a compact,
lightweight package
that is equal parts subtle and slick. The floor-mounted
baseplate will
function even when exposed to rain and snow, and the car’s
receiver coil can
be activated with the push of a button.
To keep the neighborhood cats safe and grounded, the current
is
automatically shut off if any foreign bodies are detected.
BMW allows users
to monitor the charging process with the i Wallbox and
accompanying
smartphone app.
As always, BMW strives to be an innovator. In May, the
German company
announced a solar-powered carport that would allow i3 and i8
owners to
charge their vehicles easily and conveniently at home.
The i Solar Concept gathers energy from the sun and funnels
it into the
customer’s car. If the vehicle is charged, owners can
siphon excess power
into their residence. The carport is even made from green
materials like
bamboo and carbon fiber, making the energy source as
sustainable as the cars
themselves.
[© digitaltrends.com]
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