----- Mensaje original -----
Enviado: lunes, 26 de enero de 2004
10:16
Asunto: Re: [FEMM] alnico5 versus
ceramic5 ?
Bengt,
Alnico 5 and Ceramic 5 are entirely
different materials. Alnico is an aluminium-nickel-cobalt alloy (one of the
earliest real permanent magnet materials) and doesn't have a particularly big
coercive force (I think alnico5 in Femm has Hc of about 50,000A/m), will
operate at up to about 1.2 Tesla and is electrically conductive. Ceramic 5 is
a hard ferrite made from stuff like Barium and Strontium (I will admit I don't
know exactly) and has a coercive force about four times that of alnico; it
will operate only up to about 0.4T but is non-conductive.
You will get
a dramatic difference between the two materials in most
applications.
Keith.
At 23:40 25/01/2004, you
wrote:
Hello.
I wanna start with the fact that I realy like this program.
I have had a lot of use for it when simulating magnetic structures for a
ribbon speaker (tweeter). I have used the "Alnico5" too work as a
ferritmagnet when I didn't find one in the library (didn't look at the
bottom). Now I have found it and I was very surprised that the magnetic
force increased when I replased the alnico5 with the "ceramic5".
I'm using
version3.3 build 30/3-03
Best regards. Dahlberg
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