[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [jlnlabs] TESLA COIL REVISED
Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
In the final result you coil will have a small discharge length. Inductance
ratio is the only way to go unless you're building a magnifier.
The more inductance with more turns, of course, results in a lower
frequency. Most all powerful output coils operate below 100 KHZ.
The output potential equation does not relate to the Q factor of the coil in
a CLASSIC pri-sec coil. It would be important in a third coil, ie resonator
type, coil.
Dr. Resonance
Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo WI 53913
>
> You're right that higher inductance ratio will produce higher output
> voltage, but it will also reduce resonant frequency. My proposed
> 50-turn secondary coil has at least 100 times lower resistance, and 35
> times lower inductance than your 1000-turn coil. That results in MUCH
> SMALLER resistance losses, and MUCH GREATER frequency and greater Q.
>
> The point of Tesla coil isn't the highest voltage, but providing a
> BRUSH-LIKE discharge. Otherwise it's just a fancy lightning generator.
> And for that special discharge you need AT LEAST SEVERAL HUNDRED
> kiloHertz frequency. And you can't get much more than about 100 kHz
> from your high-inductance secondary coil. If you don't believe it,
> here's what Tesla said about it:
>
> http://www.pbs-dot-org/tesla/res/res_art05.html
>
> Also, doesn't higher Q of a coil, translate into more powerful
> resonance, and with it, HIGHER VOLTAGE? Remember that the lower the
> resistance losses, the higher the voltage due to resonance will be.
>
> And the problem with your "Output (gain) = Einput x sqr (Ls/Lp)"
> equation is that it doesn't include the Q of the coil. It will be true
> for two coils made with the same diameter wire, but NOT TRUE if the
> coils are made using different wire gauges. That's because you can
> increase wire thickness without increasing coil's inductance, and
> thicker wire will output higher voltage because of higher Q, than your
> equation would predict.
>
> Jaro
>
> -----Original Message-----
> From: Tesla list <tesla-at-pupman-dot-com>
> Date: Tuesday, December 30, 2003 7:37 PM
> Subject: Re: [jlnlabs] TESLA COIL REVISED
>
>
> >Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
> >
> >
> >Using several hundred turns of thin wire is the best way to construct
> >classic Tesla coils. We use 1000 to 1,400 turns on most all of our
> coils.
> >Tesla's coils were mostly magnifier designs and in these designs hi-Q
> factor
> >for the "driver" coil is essential while the "resonator" coil does not
> >require hi-Q for maximum output.
> >
> >You need to balance the Q factor against the load impedance and
> topload
> >capacitance and consider all three to determine best output
> parameters.
> >
> >1,000 to 1,400 turns of wire works great with a large secondary toroid
> >usually 2 x the sec. coilform dia or more. This design produces
> optimum
> >output from classic coil designs.
> >
> >The large number of turns produces a high inductance ratio which is
> critical
> >to achieving best output. Q factor does not enter the equation for
> classic
> >coil design but is very important in magnifier design such as Tesla
> was
> >using on his Col. Springs coils.
> >
> >Output (gain) = Einput x sqr (Ls/Lp) (classic coil)
> >
> >Dr. Resonance
> >
> >Resonance Research Corporation
> >E11870 Shadylane Rd.
> >Baraboo WI 53913
> > >
> > > First you present a different idea and then labeled all the working
> > > coils as "Wrong". Have you tested your ideas and proven they work
> as you
> > > expect? If so we'd all like to see the results as it could open up
> a new
> > > area of coiling.
> > >
> > > Regards,
> > > Brian B (trying to keep an open mind)
> > >
> > > -----Original Message-----
> > > From: Tesla list [mailto:tesla-at-pupman-dot-com]
> > > Sent: Tuesday, December 30, 2003 10:01 AM
> > > To: tesla-at-pupman-dot-com
> > > Subject: Fwd: [jlnlabs] TESLA COIL REVISED
> > >
> > >
> __________________________________
> > > Date: Sat, 27 Dec 2003 06:54:13 -0800
> > > Subject: [jlnlabs] TESLA COIL REVISED
> > > Reply-To: jlnlabs-at-yahoogroups-dot-com
> > > Content-Type: multipart/alternative;
> > > boundary="7sXqLKCsjnyYoY64pxfTPFI2R0ZhKSZJleFSmA1"
> > > Content-Length: 1751
> > >
> > > I have a problem with today's Tesla coils. The way they're built
> these
> > > days, is with the secondary made with SEVERAL HUNDRED turns of thin
> > > wire, which is WRONG. When Nikola Tesla made his coils, they only
> had
> > > 50 to 100 turns of a THICK wire as the secondary.
> > >
> > > The problem with hundreds of turns of a thin wire is that they have
> > > many times bigger resistance than Tesla's original coils. This big
> > > resistance increases losses, and so minimizes voltage increase due
> to
> > > resonance. Thick secondary wire will have small losses which allows
> the
> > > resonance to build higher voltages.
> > >
> > > Here's how Tesla's Colorado Springs coil was built. Primary were 2
> > > turns of a thick cable, and secondary 100 turns of No. 8 wire with
> a
> > > diameter of 51 feet. That's 1:50 ratio between primary and
> secondary.
> > > Input was 50 kV into a .004 mF capacitor which was connected to the
> > > primary coil through a spark gap. It could resonate at frequencies
> from
> > > 45 to 150kHz.
> > >
> > > Tesla's power-transmission coil patent shows almost the same coil,
> > > except that the diameter was 8 feet, and secondary was wound as a
> flat
> > > coil (also no. 8 wire), and resonance was around 250kHz, producing
> 2 to
> > > 4 million volts.
> > >
> > > So if Tesla's coil could be reduced from 51' diam. to 8' diam.,
> while
> > > keeping the 1:50 primary/secondary ratio, then it should be no
> problem
> > > to reduce that coil further to about 1' diameter, using only 50
> turns
> > > of a thick wire as a secondary.
> > >
> > > The only problem would be the 50kV input that Tesla used, but even
> > > using only 5kV from a neon transformer should produce 200 to 400kV
> > > using the 1:50 ratio, since 50kV input produced 2-4 million volts.
> > >
> > > Also, using a 1' diam. secondary will reduce its inductance, which
> > > will increase resonant frequency to several MHz. And using a very
> thick
> > > wire, copper pipe or Litz wire would be needed to reduce high
> frequency
> > > losses.
> > >
> > > So, using a 1-turn primary and 50-turn secondary on a 1-foot
> diameter
> > > air-core, should make a TRUE Tesla coil which will have lower
> losses
> > > and more powerful resonance than today's "Tesla coils". Plus that
> makes
> > > it much easier to make than winding hundreds of turns.
> > >
> > > Jaro
> > >
> > >
> > >
> >
> >
>
>
>