Equation for Permeability of an electromagnetic core

[Jake110]

well i hope I am posting this in the right section, I am new here.

im making some electromagnets for a personal project I am doing but i want to get all the calculations done before i get all the materials and actually build the thing.

i need to know what/if there is an equation to find the permeability of the core material of an electromagnet. the type I am making are solenoids and i was thinking of using ferrite (alpha iron) as the core material. so its going to be a pipe/tube of ferrite with insulated copper wire wrapped around it and a patch of air through the middle.

i searched around on the internet but couldn't find anything usfull, oh and it needs to be an equation that's doesn't use the magnet flux density because I am trying to find the permeaility so i can then find the flux density which i can go on to find the force it will pull an object relative to its distance from the magnet. ill work out the last bit after i get the permeability.

 

[negitron]

Assuming you're buying this core, that data should be available from the manufacturer. I the manufacturer is unknown or you're making the core yourself (!) the easiest way is to just measure the inductance of a known, small number of turns and calculate it from that.

 

[Jake110]

i was thinking that i might have to get the info from the manufacturer but it was worth asking, thanks for the help.