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Confused about electromagnet?

by 215
Tags: confused, electromagnet
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215
#1
Apr29-13, 01:51 PM
P: 39
How do i calculate the magnet field for an Solenoid with an ironcore with x windings and y amps..

The same for an horseshoe magnet, where there is an air gap about 2mm..

For some reason does my calculation not make sense..
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mfb
#2
Apr29-13, 02:23 PM
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P: 11,888
Quote Quote by 215 View Post
For some reason does my calculation not make sense..
It would be easier to look for a mistake if you added your calculations here.
215
#3
Apr29-13, 02:33 PM
P: 39
ohh sorry my bad..

I have choosen to use 1A as constant.

For the Horseshoe magnet

B = [itex]\frac{i*n*0*r}{lj+2vr+2xr}[/itex]


lj = length of the ironcore = 0.034+0.011+0.034
0 = 4pi *10^-7
x= length of one of the airgaps
v= length of the other airgap
r = Relative permability = 0(1+XM)=5000
I = 1
For the solonoid

B = rH

H=[itex]\frac{N*I}{l}[/itex]
l = 0.065
I = 1

I know B = 0.4
I've been trying to solve for N, windings, and for the solonoid do i get 22, and for the horseshoe do i get 1688..

mfb
#4
Apr29-13, 02:53 PM
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P: 11,888
Confused about electromagnet?

Quote Quote by 215 View Post
I've been trying to solve for N, windings, and for the solonoid do i get 22, and for the horseshoe do i get 1688..
And where is the issue with those solutions?

I don't understand the horseshoe geometry with multiple (4?) air gaps.
physwizard
#5
Apr29-13, 03:03 PM
P: 153
looks like a homework problem. move to other thread??
215
#6
Apr29-13, 03:24 PM
P: 39
Homework... Well, is more like a project.. I am trying to build an Electromagnet which capable off pulling a certain amount of newton..
I done conversion from Newton to Tesla...
Now do i have define the tesla value..

http://snag.gy/oL7D5.jpg
physwizard
#7
Apr30-13, 05:34 AM
P: 153
horseshoe magnet will have only one air gap. how come you have 4? please draw the detailed diagram of the magnet.
215
#8
Apr30-13, 12:50 PM
P: 39
Here is a picture of the one I've been working with
http://snag.gy/A7zJd.jpg

There is an airgap between each leg, each leg has to pull a piece of metal with 3N, in the distance of 2 mm, i am quite unsure about the next one, but would the airgap between the the metal pieces have something to say?


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