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Oh no, I'm not thinking a larger airgap, but the C-shaped electromagnet will not work because it has a uniform flux path. And actually your example makes a lot of sense (thanks!). But say I surround the electromagnet with a permeable material (reducing the reluctance). I think this will pull...

Hey Pete, sorry for the hiatus. I did see the solenoid equation from the netdenizen website (that is actually where I got the equation I listed above). The reason I feel that I have to use a straight bar solenoid is because in order to attract another piece of iron, there has to be a gradient...

I think i found it...I think all teh iron core does is add a "k" factor to the flux density. k being the relative permeability of the core, multiplying B by a factor of k. Hmmm...I hope that is it! George

Aha...I that makes perfect sense...I thought there was something fishy in there. So, I think then, I am back to a straight cylindrical solenoid electromagnet, because that will impart a force on anoter object and try to attract it to itself...it acts like a bar magnet. And so I am back to...

Ok...one more and i think i should be off to bed soon. So one book I had describes the force between two poles, like i mentioned before to be F=(m1*m2)/(4*pi*mu*r^2) (in SI units) or F=(m1*m2)/(r^2) in cgs (although the source I got the same equation listed above drops the 4*pi...) and then it...

As you can see, i'm trying hard to understand this...I don't know why I didnt think of this earlier. So there is teh force equation between the poles of a magnet F=(m1*m2)/(mu*r^2) where m1 and m2 are teh pole strengths of the two magnets. mu=permeability constant, and r is teh distance between...

I did find more info saying the same thing you said, with the same force equation you listed above, I guess i'm confused about...well, doesn't it matter what the material being attracted to the electromagnet is? Shouldn't its magnetic properties play a role on the force exhibited on it by the...

Again i thank you for your help. However maybe I need to explain what I am doing a little more. So I need to place something, say iron in a plastic chamber in the airgap, and I need to calculate the force on the piece of iron due to the electromagnet, and that is the equation I am having...

This has been a great help...I guess there is one more thing then I am confused about. I did read through those other threads. I think i can keep the gap to under 1cm So, if I understand correctly, the flux within the airgap (if it is relatively small) is fairly constant. What then is the...

Fantastic, thank you for your help. I see you are steering me toward a "C" shaped electromagnet. I was originally (and maybe naively) thinking/hoping to be able to use a cylindrical type electromagnet to create the actuation. You think that is not the way to go? George

Hi guys, I'm new to this forum and I have what I think is a basic question. I'm not much of an electrical engineer, so I hope it does not sound too silly. I have the basic equations that characterize the magnetic field on axis with a solenoid shell at a distance away from the solenoid...

Hi guys. I have what I think is a basic question. I'm not much of an electrical engineer, so I hope it does not sound too silly. I have the basic equations that characterize the magnetic field on axis with a solenoid shell at a distance away from the solenoid. However since the field falls...