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Re: Tesla's gotta lotta Gauss
and to follow up for the magnetic flux and field
Let's assume that that primary is 10 turns with an average diameter of 8"
(20 cm).
Flux H = N* I / d, where d is the diameter of the coil in meters
H = 22900 Webers/sq meter
Field B = 4E-7*pi*H 'for vacuum (or air)
= .0287 Tesla = 287 Gauss...
so, it's not a whole lotta Gauss... (Earth's magnetic field is around 0.7
Gauss)
mediocre Alnico magnets easily do several kGauss.
If you want some serious Gauss (or Tesla), in an air core magnet, consider:
a quartershrinker, which puts 40 kA through a 10 turn coil an inch in
diameter. over 2 Tesla (20 kGauss)
or an MRI with superconducting magnets, running in the 1 Tesla area.
With an iron core (mu of several thousand), it's easy to get 1.5 or 2 Tesla,
but tough to go much above that (because the iron saturates)
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Thursday, May 25, 2000 12:51 PM
Subject: Re: Tesla's gotta lotta Gauss
>Original Poster: "Jim Lux" <jimlux-at-jpl.nasa.gov>
>
>fairly easy to calculate maximum possible peak current...
>Do it with energy.. Energy in C == Energy in L so CV^2 = LI^2... I = V *
>SQRT(C/L)
>This is IDEAL with no losses and no "pumping" of the C with pulses at just
>the right rate..
>Taking your coil as an example"
>.01 uF at 350 kHz means that L is about 21 uH. C/L is .01/21 or 4.76E-4..
>Sqrt of that is .0218
>
>Your peak voltage is 15*1.4 = 21 kV... Times the sqrt of C/L you get about
>458 amps...
>
>-----Original Message-----
>From: Tesla List <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
>Date: Wednesday, May 24, 2000 7:50 PM
>Subject: Re: Tesla's gotta lotta Gauss
>
>
>>Original Poster: "John Williams" <jwilliams-at-edm-dot-net>
>>
>>I once calculated the peak current in the primary of a coil
>>that ran off a 15 kv 60 ma neon sign transformer with a
>>0.01 mfd cap at around 350 khz...
>>
>>I forget what it was off hand, exactly but it was seriously
>>high. So I don't doubt that the flux field would be fairly
>>serious too.
>>
>>>Original Poster: ANTarchimedes-at-aol-dot-com
>>>
>>>
>>>Has anyone tried measuring the magnetic feilds of their coil using a
>>>Gaussmeter? I'll bet that a fair current is created... despite the lack
>of
>>>an iron core.
>>
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