Re: toroid shaped coil capacitance

From: 	D.C. Cox[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: 	Friday, January 02, 1998 6:37 PM
To: 	Tesla List
Subject: 	Re: toroid shaped coil capacitance

to: Mark

Do your reference books contain any equations for the "suface area" of both
a sphere and torus?  I'm working on an article for the TCBA and have the
equations for capacitance but not surface area.  Thanks in advance.


> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-pupman-dot-com>
> Subject: Re: toroid shaped coil capacitance
> Date: Thursday, January 01, 1998 11:01 AM
> From: 	Mark S. Rzeszotarski, Ph.D.[SMTP:msr7-at-po.cwru.edu]
> Sent: 	Wednesday, December 31, 1997 12:45 PM
> To: 	Tesla List
> Subject: 	Re: toroid shaped coil capacitance
> Greetings Distributed Capacitance Enthusiasts:
> At 01:51 AM 12/31/97 -0600, you wrote:>
> >From: 	Haldun Karaca[SMTP:karaca-at-izmir.eng.deu.edu.tr]
> <snip>
> <I am trying to realize a very high bandwidth Rogowski Coil s . Now I am
> >to formulate and minimise toroid shaped Bobbin capacitance .
> >
> >Could you help me namely reccommend me literature that s aim is to
> >formulate capacitance value of toroid inductances .
>         I have seen no literature references to the distributed
> of a toroidal geometry coil.  You may have to construct several coils and
> measure the capacitance yourself using Howe's method (Radiotron
> Handbook, 4th ed.).  You might be able to calculate it via integration by
> examining the energy stored in the coil (one half C x V squared) (as in
> Pulse Generators, volume 3 of the MIT Radiation Laboratory Series).
> Medhurst's distributed capacitance papers, which apply to tesla coils,
> strictly for solenoidal geometries with one end of the coil earth
>         There are some commercial vendors (Pearson) and a number of
> university sites which might be able to help you out (do a search of the
> Regards,
> Mark S. Rzeszotarski, Ph.D.