Ferrite is a bunch of tiny ferrous particles glued together by a nonconducting substance. It has magnetic properties but currents can’t flow in it (at least not very far). I haven’t tried, but I bet an ohmmeter would say it’s an insulator.
Victor 4X6GP > On 3 Sep 2020, at 7:48, Adrian <vk4...@gmail.com> wrote: > > 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 > > From Wikipedia, the free encyclopedia > Jump to navigation <https://en.wikipedia.org/wiki/Dielectric#mw-head>Jump to > search <https://en.wikipedia.org/wiki/Dielectric#searchInput> > 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 >> >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to k2vco....@gmail.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
