[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [TCML] Bipolar coils
Its not true about the opposite winding.
The original coil I had wound for my bipolar was just a continuous
length coil, until I found that this creates a severe over coupling
situation.
I removed about 2 inches from the center of the coil, tapped the center
to ground (actually it works just as well just connecting to the center
of the primary), and it worked marvelous.
And if you think about it, what you're doing with a bipolar is creating
a series loop relative to ground, pushing one side of the coil and
pulling on the other simultaneously, so that the hi-side of one side of
the coil is extreme negative and the other extreme positive, which is
really what we want in this situation. If they were wound opposite they
would both be the same polarity on the high side, and so not as
attracted to one another. ]
I believe the way I did it was to just make calculations for one side of
the coil. Its basically just two coils stretching from that center tap.
The primary is hooked up the same way as a standard coil, so figure for
a standard coil on one side, repeat for the other.
Leave yourself as much extra primary winding as you can afford, then you
can vary your topload as you wish.
Make your primary former large, or you'll have frustrating and non
correctable racing spark issues that will destroy your coil.
I would say go with a primary that is 3 times the diameter of the
secondary. And when you remove the center windings, remove enough so
that your coil doesn't start too far into the interior of the primary,
or you'll get over coupling from that as well.
Good luck. Bipolars are fun projects.
:)
Shannon Weinhold
-----Original Message-----
From: Grant Visser [mailto:freeekyg@xxxxxxxxx]
Sent: Monday, April 11, 2011 1:54 AM
To: Tesla Coil Mailing List
Subject: [TCML] Bipolar coils
Hi again,
I cannot seem to find a definitive resource for information on bipolar
coil design methodologies so am hoping someone on this list will be able
to help me out or point me in the right direction.
I have a 2KW SSG coil that I want to convert into a bipolar
configuration for environments where I have no access to a dedicated RF
earth.
For my purposes I am wanting to build a horizontal bipolar coil rather
than the more common twin coil system. I remember reading somewhere a
long time ago that the secondary coil needs to be wound in opposite
directions from the centre point but cannot find that reference
anymore???
I am also unsure of how to go about the resonance calculations,
toploading, etc.
Any help or advice greatly appreciated.
Keep em sparks flying
Grant
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla