Re: [TCML] Topload design questions

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

Does this relationship hold with differing major diameters as well? In other words, in your example of a 6" x 30", would the height be the same as for a 6" x 24"?

Also, would the height for a 6" x 24" toroid be the same for a 6" secondary as for a 10" secondary?

thanks
Adam


--- On Sun, 1/4/09, DC Cox <resonance@xxxxxxxxxxxx> wrote:

> From: DC Cox <resonance@xxxxxxxxxxxx>
> Subject: Re: [TCML] Topload design questions
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Sunday, January 4, 2009, 3:35 PM
> This is measured from the lowest point on the toroid's
> minor dia (bottom of
> the ball) in a vertical line (note --- not direct line) to
> the last winding
> on the sec coil.
> No pancake on the sec. coil.
> 
> Example to clarify:  If you have a 30 x 6" toroid,
> then 1.2 x 6" (minor dia)
> = 7.2" elevation above last turn of sec coil.
> 
> 1,2 x minor dia. elevation balances electrostatic
> protection of sec and
> reduces the "shorted turn effect" of the toroid
> itself, which tends to
> reduce output slightly.
> 
> There is a rather scientific method you can use (which I
> used to distill my
> equation):
> 
> Set up a camera digital or preferably an old film camera
> with 400 ASA black
> and white film (best).
> 
> Shoot various 5 sec timed exposure in complete darkness
> while elevating your
> toroid to different levels, ie, 1.2, 1.3, 1.4, 1.5 .... up
> to 2.5 x minor
> dia.
> Carefully record the film frame number and also the
> elevation to match each
> frame.
> 
> You will see some corona emerging at 45 degrees from the
> last turn on the
> sec.   When the elevation is correct this corona is
> supressed such that a
> small amount issues at an angle of nearly 0 degrees (even
> horizontal level)
> or slightly above horizontal.  When this angle is at 0
> degrees this is
> optimum supression and proper balancing of these two
> effects.
> 
> If the angle is below the horizontal plane of the last sec
> turn, then you
> are beginning to enter the zone of shorted turn effect of
> the toroid itself,
> which is undesireable.
> 
> A perfect balance can be achieved in all coil setups using
> the procedure I
> have outlined above.  If you don't have an old film
> type camera, digitals
> can be
> used but it may be somewhat dangerous to your camera to get
> it close enough
> to work properly.  I prefer an old film camera for this
> experiment.
> 
> Time permitting, I usually do this on most new coil designs
> I build.
> 
> I've charted my data from many coils and the equation
> is usually within 5%
> by using 1.2 x toroid minor dia for proper elevation.
> 
> Dr. Resonance
> 



      
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