Re: Mike Marcum Ferrite Cores

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: mecortner@xxxxxxxxxx 

>2k is a low number (see above)... but ummm, who cares that its
>2x2? Its flux *Density*, so the actual flux (in webers) depends on
the >area.

Hi Steve.

Your right, I'm mixing up the two terms. I
guess what I really need is an equation to
take the max density of the material in
gauss and convert it to webbers per square
area? Does that sound right?


>I dont understand your conclusion...

What I was referring to, is if you take a magnet
and measure it's lift ability in pounds and then
place it on a chunk of ferrite with a certain
cross section and length, then re-measure it's
lift ability through the ferrite piece, it will
be something less. But how much less is what
concerns Me. That will give Me an idea of how
thick to make the core.

The magnets are on the rotor, their field will
penetrate thorough the core, but the coils will
produce their own field under load that is 90
degrees to the magnets field. If the core
saturates then some of the coils field will leak
out of the stator and hit the rotor magnets,
creating drag. For instance you'd have the north
pole of the magnet hitting the north field of a
stator coil as it moves toward the coil.


>I have also been working on a CCPS, inspired by Marco's project Thor
>power supply. I have a webpage for it that really needs updating,
>but might be of interest to some of you:

Nice work there!
By the way, how do you actually measure a
parameter like saturation in a core?

---- Matt Cortner ----