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Ferrites, air-gaps, inductors
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From: Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Wednesday, February 18, 1998 3:57 PM
To: Tesla List
Subject: Re: Ferrites, air-gaps, inductors
Hi Ed,
> From: Edward V. Phillips [SMTP:ed-at-alumni.caltech.edu]
> Sent: Tuesday, February 17, 1998 11:45 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: Ferrites, air-gaps, inductors
>
> "Over the weekend I fluoro'd a commercially-made rod choke, about 1/2
> inch in diameter by 5 inches long. The inside was composed of five
> 1-inch lengths of ferrite bar, with about a 1/16 inch gap between each
> rod. Perhaps Malcolm's comments explain why this wasn't just one solid
> ferrite bar."
>
> Any idea what the inductance is? The effective permeability
> of that gapped rod core is probably less than 20, so wouldn't
> expect enough inductance to be of any use for TC work. What
> frequency does it operate at? Flux density is proportional to the
> voltage across the coil and inversely proportional to core area,
> number of turns, and frequency.
>
> Ed
Shouldn't flux density be proportional to the number of turns (rather
than inversely proportional)?
Malcolm