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HI Everyone,
I want to share this
Information as it is
very important to
understand the
principals behind
this coil. There is
a difference between
Self Inductance and
Inductance. Self
Inductance is a
coils ability to
induce a current in
itself in the
opposite direction
of the current
applied to the coil.
Thus energy is
wasted in the
energising of the
coil as energy is
used in overcoming
the Self Inductance.
This coil (Nikola
Tesla's Patent No.
512,340) is a very
important coil
because of its
characteristics,
firstly to reduce
the Self Inductance
(Nikola Tesla said
to zero) but I would
say that this
depends on the coils
configuration. E.g.
Compound coil vs.
Flat coil. It is
important to note
this coil is not a
non inductive coil.
It is a Bifilar
Inductive non Self
Inductive coil. Here
are the following
types of Bifilar
coils:
Four types of
bifilar-wound coils:
-
parallel-wound,
series connected
-
parallel-wound,
parallel
connected
-
counter-wound
caduceus coil
(series)
-
counter-wound
caduceus coil
(parallel)
Ref:
http://en.wikipedia.org/wiki/Bifilar_coil
Mobius Coils are
different again and
are not what I am
currently interested
in. Here is a good
link for more
information.
http://www.rexresearch.com/davis/davis.htm
These coils are
sometimes used in
resistive Inductors
as the above link
says. We don't want
to turn energy to
heat and waste it we
want to use it for
Motive Force. To do
Work. These coils
have also been
around for a very
long time.
UNITED STATES PATENT
OFFICE.
NIKOLA TESLA, OF NEW
YORK, N.Y.
COIL FOR
ELECTRO-MAGNETS
SPECIFICATION
forming part of
Letters Patent No.
512,340, dated
January 9, 1894.
Application filed
July 7, 1893. Serial
No. 479,804. (No
model.)
To all whom it may
concern:
Be it known that I,
NIKOLA TESLA, a
citizen of the
United States,
residing at New
York, in the county
and State of New
York, have invented
certain new and
useful Improvements
in Coils for
Electro-Magnets and
other Apparatus, of
which the following
is a specification,
reference being had
to the drawings
accompanying and
forming a part of
the same.
In electric
apparatus or systems
in which alternating
currents are
employed the
self-induction of
the coils or
conductors may, and
in fact, in many
cases does operate
disadvantagely by
giving rise to false
currents which often
reduce what is known
as the commercial
efficiency of the
apparatus composing
the system or
operate
detrimentally in
other respects. The
effects of
self-induction,
above referred to,
are known to be
neutralized by
proportioning to a
proper degree the
capacity of the
circuit with
relation to the
self-induction and
frequency of the
currents. This has
been accomplished
heretofore by the
use of condensers
constructed and
applied as separate
instruments.
My present invention
has for its object
to avoid the
employment of
condensers which are
expensive,
cumbersome and
difficult to
maintain in perfect
condition, and to so
construct the coils
themselves as to
accomplish the same
ultimate object.
I would here state
that by the term
coils I desire to
include generally
helices, solenoids,
or, in fact, any
conductor the
different parts of
which by the
requirements of its
application or use
are brought into
such relations with
each other as to
materially increase
the self-induction.
I have found that in
every coil there
exists a certain
relation between its
self-induction and
capacity that
permits a current of
given frequency and
potential to pass
through it with no
other opposition
than that of ohmic
resistance, or, in
other words, as
though it possessed
no self-induction.
This is due to the
mutual relations
existing between the
special character of
the current and the
self-induction and
capacity of the
coil, the latter
quantity being just
capable of
neutralizing the
self-induction for
that frequency. It
is well-known that
the higher the
frequency or
potential difference
of the current the
smaller the capacity
required to
counteract the
self-induction;
hence, in any coil,
however small the
capacity, it may be
sufficient for the
purpose stated if
the proper
conditions in other
respects be secured.
In the ordinary
coils the difference
of potential between
adjacent turns or
spires is very
small, so that while
they are in a sense
condensers, they
possess but very
small capacity and
the relations
between the two
quantities,
self-induction and
capacity, are not
such as under any
ordinary conditions
satisfy the
requirements herein
contemplated,
because the capacity
relatively to the
self-induction is
very small.
In order to attain
my object and to
properly increase
the capacity of any
given coil, I wind
it in such way as to
secure a greater
difference of
potential between
its adjacent turns
or convolutions, and
since the energy
stored in the coil
considering - the
latter as a
condenser, is
proportionate to the
square of the
potential difference
between its adjacent
convolutions, it is
evident that I may
in this way secure
by a proper
disposition of these
convolutions a
greatly increased
capacity for a given
increase in
potential difference
between the turns.
I have illustrated
diagrammatically in
the accompanying
drawings the general
nature of the plan
which I adopt for
carrying out this
invention.
Figure 1 is a
diagram of a coil
wound in the
ordinary manner.
Figure 2 is a
diagram of a winding
designed to secure
the objects of my
invention.
Let A,
Figure 1,
designate any given
coil the spires or
convolutions of
which are wound upon
and insulated from
each other. Let it
be assumed that the
terminals of this
coil show a
potential difference
of one hundred
volts, and that
there are one
thousand
convolutions; then
considering any two
contiguous points on
adjacent
convolutions let it
be assumed that
there will exist
between them a
potential difference
of one-tenth of a
volt.
If now, as shown in
Figure 2, a
conductor B
be wound parallel
with the conductor
A and
insulated from it,
and the end of A
be connected with
the starting point
of B, the
aggregate length of
the two conductors
being such that the
assumed number of
convolutions or
turns is the same,
viz., one thousand,
then the potential
difference between
any two points in
A and B
will be fifty volts,
and as the capacity
effect is
proportionate to the
square of this
difference,
the energy stored in
the coil as a whole
will now be two
hundred and fifty
thousand as great.
Following out this
principle, I may
wind any given coil
either in whole or
in part, not only in
the specific manner
herein illustrated,
but in a great
variety of ways,
well-known in the
art, so as to secure
between adjacent
convolutions such
potential difference
as will give the
proper capacity to
neutralize the
self-induction for
any given current
that may be
employed. Capacity
secured in this
particular way
possesses an
additional advantage
in that it is evenly
distributed, a
consideration of the
greatest importance
in many cases, and
the results, both as
to efficiency and
economy, are the
more readily and
easily obtained as
the size of the
coils, the potential
difference, or
frequency of the
currents are
increased.
Coils composed of
independent strands
or conductors wound
side by side and
connected in series
are not in
themselves new, and
I do not regard a
more detailed
description of the
same as necessary.
But heretofore, so
far as I am aware,
the objects in view
have been
essentially
different from mine,
and the results
which I obtain even
if an incident to
such forms of
winding have not
been appreciated or
taken advantage of.
In carrying out my
invention it is to
be observed that
certain facts are
well understood by
those skilled in the
art, viz: the
relations of
capacity,
self-induction, and
the frequency and
potential difference
of the current. What
capacity, therefore,
in any given case it
is desirable to
obtain and what
special winding will
secure it, are
readily determinable
from the other
factors which are
known.
What I claim as my
invention is:
-
A coil for
electric
apparatus the
adjacent
convolutions of
which form parts
of the circuit
between which
there exists a
potential
difference
sufficient to
secure in the
coil a capacity
capable of
neutralizing its
self-induction,
as herein before
described.
-
A coil composed
of contiguous or
adjacent
insulated
conductors
electrically
connected in
series and
having a
potential
difference of
such value as to
give to the coil
as a whole, a
capacity
sufficient to
neutralize its
self-induction,
as set forth.
NIKOLA TESLA.
Witnesses:
- Robt. F.
Gaylord
- Parker W.
Page
Thanks to:
http://www.magnetricity.com
for the very well
presented
information on these
coils.
Some Extremely
interesting
information in this
link:
Click Here
This illustration
really shows the
massive benefits
behind this coil.
Well more coming
soon as always.
_____________________
To reach new
horizons...
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