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Re: MOT to NST "extra transformer" CORRECTION
Terry, all,
I wrote:
> From: Self <DIRECTORATE/MALCOLM>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: MOT to NST "extra transformer"
> Date sent: Thu, 24 Sep 1998 14:59:43 +1200
<snip>
> and as the core gets smaller, the inductance must rise to keep Imag
> from saturating the core. I don't think you'll be much better off
> sizewise. Equations worth noting:
>
> Magnetizing force = Np*Imag
> Imag = Vp/2*PI*Fmains*Lp
> Lp = k*Np^2 where k is a core induction constant
>
> If Np halves, Lp quarters and Imag doubles.
**** That should in fact be Imag quadruples!!! :( So N*I doubles if
N is halved which is correct. The post otherwise stands.
Sorry,
Malcolm
> Nub of the problem is
> that the core can only support so many Ampere-turns before it
> saturates. For good transformer operation the core must be ungapped
> so core area becomes a critical factor (flux density or flux/area^2)
> Effective core length does not greatly influence maximum core flux in
> an ungapped design and really only exists to allow a winding window
> which in turn allows copper mass for a power rating.
>
> Malcolm
>