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Self Capacitance of toroidal coil? - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


oz7acs
Post subject: Self Capacitance of toroidal coil? Posted: Thu Jul 26, 2007 10:16 am

Lieutenant


Joined: Thu Jul 26, 2007 9:25 am
Posts: 4
Location: Roskilde, Denmark
Hi againm
1) Does anyone know how to model the self capacitance between windings of a toroidal coil wounded on a nonmagnetic ring? or a ferrite ring?
Let's say that we have 40 turns, outer core diameter is 35mm and the relative permittivity of the ferrite is about 15.
I am interested in a simple model of the self capacitance as a limiting factor of the actual measured inductance at a frequency well below the upper limit due to the unwanted LC-effect.
2) Will the self-cap in air with close distance between turns (<1mm) or the self-cap across the core with larger distance (>6mm) be the most contributing cap?
3) How will self-cap change if the coil is wounded in 2 layers as opposed to one layer?
4) What about stray capacitance at low frequencies: f<10MHz? or f<1MHz?
Will it matter?

_________________
Best regards and
Vy 73 de OZ7ACS aka JPH




Posted  11/12/2012
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