Recent content by Sibilo

no, wait a moment Baluncore, maybe I'm getting confused, inserting the section A, in the formula of the magnetic field B, I don't think it can be possible, given that the value A, fs part of the structure of the coil and therefore must be inserted in the formula of the inductance (which then...

hi, I hope I used the right formulas, to calculate the section I used the inverse formula of the magnetic field and therefore: A= u * N * I /B * L and considering a desired magnetic field of 0.94 tesla, permeability of the glass of 10,000, 20 turns and a current of 1.5 ampere, and length of 40...

marcusl I'm sorry you want to abandon me, I wrote a very complete answer to Baluncore, it could help you understand my electromagnet better, I would just like to know which magnetic core material to choose between metglas and powders

thanks as always for your answers, you are very kind, yes of course the electromagnet does not have a real air gap since it is an open circuit, it is a cylindrical bar. obviously B must be proportional to the density of turns, now I do not remember the value of H, but I think around 2500 ampere...

no it is absolutely not a transformer, there is only one winding so it is an electromagnet with a magnetic core, the shape is cylindrical, since if I had chosen the toroidal one I would have had the field confined inside, it is a simple electromagnet.however I really believe that, doing the...

my goal is the transfer of energy at educational level, the currents should be around 10 amps, the losses are those characteristic of the magnetic core (dust)

sorry if I answer you after a long time but I did not have the connection, then assuming that I wanted to reach a magnetic field induction of 1 T and a frequency of 5 khz or higher, here if I use the powders (sendust, mpp) they have low permeability max 505, and this would allow me to return...

have read a lot about these topics, only I would like the most correct answer between metglas and powders (mpp or sendust) which is the best with lower losses at frequencies of >5 khz and high induction fields >1 tesla?

Hi Dave, on mouser they sell metglas (microlite) magnetic cores and they don't cost much, it has a high permeability compared to powders (mpp) also metglas is an amorphous metal. maybe for the tapes you are confusing it with mumetal, used for shielding. in the technical sheets it is confirmed...

eh indeed yes, a permeability of 14 is too low and I would have to make too many turns and therefore increase the inductance, and having a high inductance and high frequency, increases the reactance, therefore the permeability must be high, only that for example for the mpp it reaches a maximum...

no no absolutely the field will have a frequency of 5 khz or higher, it depends on the design

As per the title, I am unable to understand the relationship between relative permeability and frequency losses of some materials. Considering metals in powder form such as (mpp, sendust and high flux) and metglas (amorphous). Why does the density also increase in powders (mpp, sendust, high...

yes, I understood, but I said from the beginning that it was my experimentation followed by articles. However, now it seems a bit unfair to close, what will you do?

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.internazionale.it/magazine/alice-hayward/2023/04/06/anche-le-piante-chiedono-aiuto&ved=2ahUKEwjZ4qPev_aCAxWORvEDHTQuAOk4ChAWegQIAhAB&usg=AOvVaw0ae4hs5y05zxxKCwzRHbD2

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.nationalgeographic.it/come-comunicano-le-piante%23:~:text%3DVoci%2520ultrasoniche,fiori%2520sono%2520pronti%2520all%27impollinazione.&ved=2ahUKEwj5w6Gzv_aCAxWSefEDHZMCCiIQFnoECAwQBQ&usg=AOvVaw296Z0s1WhBq2md9xEIMtNS