Posted by
Adrian-3 on
Sep 03, 2020; 4:47am
URL: http://elecraft.85.s1.nabble.com/OT-WWV-Time-Transmissions-tp7664561p7664645.html
Please quote your online reference please regarding ferrite cores being
a dielectric
If so then my not just use un-enammeled wire on a course wound core ? A
dielectric is an insulator ;
Dielectric
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Not to be confused withDielectric constant
<
https://en.wikipedia.org/wiki/Dielectric_constant>orDialectic
<
https://en.wikipedia.org/wiki/Dialectic>.
A*dielectric*(or*dielectric material*) is anelectrical insulator
<
https://en.wikipedia.org/wiki/Insulator_(electricity)>
I don't see any reference to ferrite cores being a dielectric online.
The molecular alignment heating method regarding dielectric loss, is not
mentioned on any ferrite core RF heating science, that I can find.
Please read ;
Predicting Temperature Rise of Ferrite Cored Transformers George
Orenchak TSC Ferrite International 39105 North Magnetics Boulevard
Wadsworth, IL 60083
"Core Losses Core losses are a significant contributor to the
temperature rise of a transformer. Hysteresis loss, eddy *current* loss
and residual loss all contribute to the total core loss. At high flux
densities and relatively low frequencies, hysteresis losses are usually
dominant. Hysteresis loss is the amount the magnetization of the ferrite
material lags the magnetizing force because of molecular friction. The
loss of energy due to hysteresis loss is proportional to the area of the
static or low frequency B-H loop. At high frequencies, eddy current
losses usually dominate. Eddy *current* loss is from a varying induction
that produces electromotive forces, which cause a current to circulate
within a magnetic material. These eddy *currents* result in energy loss.
Understanding the behaviour of the combined total core loss as functions
of flux density and of frequency is most important. "
Dielectric is not mentioned.
On 3/9/20 2:15 pm, David Gilbert wrote:
>
> If you weren't too stubborn you could find many, many online
> references to the dielectric characteristics of ferrites. A ferite
> core absolutely IS a dielectric. There is nothing false about what
> I've been telling you.
>
> Dave AB7E
>
>
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