K
[email protected]
- Jan 1, 1970
- 0
I bought some N41 ferrite material surplus pot cores from BGMicro.
References I dug up on the net give N41 initial permeability of 2800 to
3000.
looking at this:
http://www.ee.surrey.ac.uk/Workshop/advice/coils/mu/
in the section "ferromagnetic materials" B versus H graph, I noticed
the significant variation in permeability (slope of the graph) as flux
density goes from small to medium values.
And then I saw in the following link that the initial permeability of
N41 seems to be measured at the extrememly low flux density, 0.25 mT.
http://www.epcos.com/web/generator/Web/Sections/Components/Page,locale=en,r=263282,a=263370.html
which would seem to indicate that the permeability in practical use
like a SMPS would be quite a bit higher than the listed initial
permeability of about 3000. Should I use the listed ui or some other
value?
References I dug up on the net give N41 initial permeability of 2800 to
3000.
looking at this:
http://www.ee.surrey.ac.uk/Workshop/advice/coils/mu/
in the section "ferromagnetic materials" B versus H graph, I noticed
the significant variation in permeability (slope of the graph) as flux
density goes from small to medium values.
And then I saw in the following link that the initial permeability of
N41 seems to be measured at the extrememly low flux density, 0.25 mT.
http://www.epcos.com/web/generator/Web/Sections/Components/Page,locale=en,r=263282,a=263370.html
which would seem to indicate that the permeability in practical use
like a SMPS would be quite a bit higher than the listed initial
permeability of about 3000. Should I use the listed ui or some other
value?