There is a company near me that owns many recent patents on the wireless transmission of electricity, which has been featured in Popular Science and in at least one TED talk on youtube:
http://www.witricity.com/
While their methods and patents do work, the devices of course follow the inverse square law of loss of power over distance, and while they use electromagnetic resonance, from what I gather, they are not that much like the Tesla coils discussed on this list. From what I gather over the years, it seems like this list is for making 'leaky' air core resonant transformers that produce those lovely streamers and sparks that are a joy to watch and behold, and not really for discussion of the wireless transmission of power - and potentially information, which was Tesla's original intent for the types of coils we make. We think coils that leak out of their toploads look quite pretty and tend to keep the discussions around that, and the various ways to achieve that effect.
That being said, wireless transmission of electricity with a resonant transformer is a repeatedly proven fact, buts is practicality is somewhat limited, though improvements upon it are being actively worked on, formally by WiTriCity, and informally by many others. I am sure there are other forums or mailing lists on the internet where that type of discussion is welcome. But if they start to mention 'free energy', turn around and run the other way!
----------------------------------
Brian Hall
Date: Fri, 24 May 2013 10:50:48 +0930
Subject: Re: [TCML] Is a TC reversible?
From: frosty90@xxxxxxxxx
To: tesla@xxxxxxxxxx
Hang on, i dont think its as impossible as you all make it seem, say you
drive the secondary with some external source, as it rings down power is
coupled to the primary, where a carefully synchronised gap lines up and
fires, transfering power to the primary circuit. Now the perfectly
synchronised gap goes out when the capacitor voltage is max and primary
current is zero, so the transformer sees the primary cap voltage. Now we
design our gap very cleverly or build a solid state triggered gap from scrs
and by timing the triggering or alignment of the gap at the appropriate
points in the primary ring up, sythesise in 50 hz in the same way an
inverter would: like a cycloconverter with a resonant ac link!
Possible in principle, but certainly not with a static gap, and possibly
impractical in any realisation.
On May 24, 2013 12:59 AM, <mddeming@xxxxxxx> wrote:
If connected directly, loading would destroy resonance. If in proximity,
1) Efficiency is very low ~1%.
2) The output voltage will be much lower than 110V
3) It will still be at ~100-400 KHz, not usable by most devices. You could
try to rectify and then invert, but power losses would be enormous 99.9%+.
To be a motor, there must be some mechanism to convert energy into motion.
The term "natural motor" is undefined.
A Tesla coil is VHF AC. Ion-drive motors are not AC devices and are only
useful in near zero-gravity conditions where accelerations of mm/day/day
are acceptable.
Matt D
-----Original Message-----
From: Matthew Hebb <matthewhebb@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, May 22, 2013 11:18 pm
Subject: RE: [TCML] Is a TC reversible?
i think what hes trying to say is can you take the output and somehow step
it
back down to useable electricity ...and yea as he said how could it be a
motor?
From: dh@xxxxxxxxxxxxxx
To: tesla@xxxxxxxxxx
Subject: RE: [TCML] Is a TC reversible?
Date: Wed, 22 May 2013 16:25:40 -0700
#1) - no and
#2) - ???
First, the 60Hz is converted to several hundred kilohertz by the action
of
the spark gap and the resonant circuit of your primary and capacitor. No
way
to reconstitute the 60Hz. You need to study some basic electrical theory.
Second, how could it be a motor? Where is the mechanism?
Dave
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx
[mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of nickobert testein
Sent: Wednesday, May 22, 2013 09:46
To: Tesla Coil Mailing List
Subject: [TCML] Is a TC reversible?
Hello- Theoretical question: Is a TC a motor/generator?
If a 110/60zhz powered Tesla Coil (A) output was attached to
the top of an
non-powered Tesla Coil (B), would one expect to get 110/60hz
from Tesla
Coil (B)s' plug leads?
Is a Tesla Coil also a natural motor?
NT
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