Re: Fwd: [jlnlabs] TESLA COIL REVISED6

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Tom Stathes <newphreak_16-at-yahoo-dot-com> 


--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: Terry Fritz
 > <teslalist-at-twfpowerelectronics-dot-com>
 >
 > Hi,
 >
 > I am not sure who the original writer is, but...
 >
 > At 07:48 AM 12/30/2003, you wrote:
 >
 > >Note: forwarded message attached.
 > >
 > >
 > >__________________________________
 > >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.
 >
 > Tesla used a three coil system while most of today's
 > Tesla coil builder's
 > use two coil systems.  They are considerably
 > different machines made for
 > different environments.  However, the basic
 > principles are the same.
 >
 >
 > >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.
 >
 > Due to the high voltage, the resistance loss in the
 > secondary is small and
 > not a major energy loss.
 >
 >
 > >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.
 >
 > His think secondary actually had 17 turns of wire.
 > He had a third coil 12
 > high 6 feet diameter 160 turns of #10.  It was a
 > magnifier with a modern
 > example at:
 >
 > http://www.ttr-dot-com/model13.html
 >
 >
 > >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.
 >
 > See the above model 13 details at www.ttr-dot-com.
 >
 >
 > >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.
 >
 > Winding hundreds of turns is not that hard ;-)  But
 > most of the losses
 > (40%) go into the spark at the gap.  The other
 > system losses due to coil
 > heating and cap losses are very small compared to
 > the spark gap.  "Modern"
 > Tesla coils are optimized for spark length given
 > commonly available input
 > power and size requirements.
 >
 > Of course, if one can make a better Tesla coil, just
 > do it!!! :-))
 >
 > Cheers,
 >
 >          Terry
 >
 >
 >
 > >Jaro
 >
 >


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