Re: Inductance Charged Coil? / Tesla's DC induction arc based coil

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

Original poster: Harvey Norris <harvich-at-yahoo-dot-com> 


--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: tesla <tesla-at-paradise-dot-net.nz>
 >
 > Team
 > Does anybody know if a disruptive coil has ever been
 > successfully made in
 > which the primary inductor is charged first (lots of
 > I liitle V) to store
 > 0.5LI^2 joules. Charging stopped and the collapsing
 > field then produces high
 > volts and off you go.

Tesla filed many different patents on variations of
his idea of a air core high frequency, high voltage
transformer. This particular one may have been an
early one, based on the prevalent use of DC at that
Edison period of DC...

Actual patent in pdf should be accessible as
http://www.keelynet-dot-com/tesla/00568176.pdf

Essentially what Tesla seems to be doing in this
patent is to use the process of a DC induction arc as
the substitute for an AC high voltage transformer to
cause the rf bursts on the tesla primary. The
charge deposit alone made by having the capacitor in
series with the choke coils would not be suffiicient
to operate the coil. Thus ideally a fast interuption
rate for capacitor discharging should occur. When the
rf burst occurs, although technically the rf burst
itself provides a pathway for the choke coils to
continue functioning in a DC manner, this only occurs
on one polarity side of the rf burst itself, where the
polarities from both events are coinciding.

      It is advisable to simply print this patent out
for study, rather then to try and fathom the totality
of these ideas from the pdf viewing itself.

Note line 36 of page 1 of specifications...
but adapted more particularly for direct application
to and use with existing circuits carrying direct
currents, such as the ordinary municipal incandescent-
lighting circuits. (this was Edisons time period,
where DC was the norm)

Tesla goes on to show two separate embodiments of this
DC source for a tesla coil. He does not use a high
voltage AC transformer, which is the norm for later
versions of the tesla coil. Instead he uses the high
voltage created by a DC induction arc. The faster you
open the connections, the higher the voltage that gets
expressed in the DC induction arc. You need high
voltage to get a tesla coil to function to ignite the
arc on the primary. The first embodiment does not use
A
DC motor incorporated in the ACTUAL electrical
connections of the air core transformer, it is
independently used simply as the rotary device that
opens and closes the series path of induction coils,
which is just a simple break of two induction coils,
where the primary quantites of L and C are intervening
between the induction arc.

      The second embodiment DOES use such a scheme,
where the DC motor itself is incorporated electrically
into the circuit, ie, the motor field coils are in
series with the capacities, but these must be quickly
broken for cap discharge across the primary L, so as
to empty that cap storage of charge, which momentarily
becomes enhanced by the action of the high voltage
deposition occuring in the induction arc per se, or
the conduction across those field coils, which in turn
operate the rotary gap will cease, because the field
coils quit their conduction the moment the capacities
become fully charged, since it is a DC source of
voltage that is being applied to the entire
configuration.
Line 30 pg 2 of specifications...
In such case the field coils M take the place of the
choking coils B. In this arrangement, and in fact
generally, it is preferable to use two condensors, or
a condensor in two parts, and to arrange the primary
coil of the (air core) transformer between them. The
interuptions of the field circuit of the motor should
be so rapid as to permit only a partial
demagnetization of the cores. (or the mechanical
operation of the rotary arc gap driven by the DC motor
itself will suffer)

Now guess what? The primary caps are in series with
those cores. If an induction arc doesnt happen before
the cap gets fully charged, which then deposits a much
higher charge on those caps via induction arc: the
moment the cap gets fully charged, there will no
longer be any DC current in the field of the motor:
and it is that motor itself in this special case which
itself is causing the induction arc to happen in the
first place by virtue of the fact that it is that DC
motor that operates the make and break rotary arc gap.
It is a case of the dog chasing its own tail, and the
cause also being the effect.

I may have misinterpeted this patent, but the drawing
of embodiment two seems to show that the coils G are
the commutated armature of the DC motor, where the
field coils M CAUSE that rotor G to rotate, which in
turn operates the rotary arc gap, which in turn
depletes the cap storage after a high voltage charge
deposition. Perhaps the DC motor itself might exhibit
some unusual qualities, as it would then technically
be a pulsed DC field, and perhaps some rf kickback on
the field coils themselves might occur.

Sincerely Harvey D Norris