Equation for Permeability of an electromagnetic core


by Jake110
Tags: electromagnet, equation, permeability, physics
Jake110
Jake110 is offline
#1
Jul18-09, 04:56 AM
P: 31
well i hope im posting this in the right section, im new here.

im making some electromagnets for a personal project im 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 im 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 thats doesn't use the magnet flux density because im 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.
Phys.Org News Partner Physics news on Phys.org
Better thermal-imaging lens from waste sulfur
Scientists observe quantum superconductor-metal transition and superconducting glass
New technique detects microscopic diabetes-related eye damage
negitron
negitron is offline
#2
Jul18-09, 06:37 AM
Sci Advisor
negitron's Avatar
P: 842
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
Jake110 is offline
#3
Jul18-09, 06:43 AM
P: 31
i was thinking that i might have to get the info from the manufacturer but it was worth asking, thanks for the help.


Register to reply

Related Discussions
Electromagnet and core permeability Engineering, Comp Sci, & Technology Homework 3
confusing on permeability and relative permeability Classical Physics 3
Electromagnetic wave equation Advanced Physics Homework 6
CPU differences: quad core, dual core, etc. for CFD Mechanical Engineering 3
Electromagnetic Wave Equation General Physics 1