Todd619
Structural
- Jan 7, 2005
- 31
I'm designing an electromagnet and found the thread "Designing a simple elctromagnet and need help" very helpful, especially UKpete's formula tutorial. I've been playing around with those formulas, but I would like to try to refine the calculations and try to get the calculations as accurate as possible. I want to figure in the reluctance of the yoke and pole pieces and also hopefully calculate losses due to fringing and leakage which was not part of the calculations shown below. Can anyone describe how to do that using the same type of formulas provided by UKpete below. I would prefer to avoid calculus as I only had one year and that knowledge is rapidly rusting away (no line integrals please)
*********************************************************
reluctance S = g/(?0*A)
where g is the airgap length (m), A is the airgap cross-sectional area (m²),
?0 is permeability of free space 4*pi*10-7
flux ? = NI/S where N = no. of turns, I = current (A)
flux density B = ?/A - in Tesla (1T = 10000G), A is airgap csa as above.
******************************************************
I combined and rearranged these so that I can estimate my amp turns needed; NI = Bg/?0
My electromagnet will differ in that it will have two coils in what I believe is called an "H" configuration (square yolk w/ 2 pole pieces on the inside each with a coil and a single gap) instead of a "C" configuration and will be larger and more powerful than the one in the thread I mentioned before. It will be about 6" or 15.24 cm dia. at the pole faces and generate a field of about 1.5 T across a 1.5 cm gap and I plan to try to design it so that it can be air cooled, I'm not sure what type of steel or iron the yoke and pole pieces will be made of yet.
Thanks for any help
-Todd619
*********************************************************
reluctance S = g/(?0*A)
where g is the airgap length (m), A is the airgap cross-sectional area (m²),
?0 is permeability of free space 4*pi*10-7
flux ? = NI/S where N = no. of turns, I = current (A)
flux density B = ?/A - in Tesla (1T = 10000G), A is airgap csa as above.
******************************************************
I combined and rearranged these so that I can estimate my amp turns needed; NI = Bg/?0
My electromagnet will differ in that it will have two coils in what I believe is called an "H" configuration (square yolk w/ 2 pole pieces on the inside each with a coil and a single gap) instead of a "C" configuration and will be larger and more powerful than the one in the thread I mentioned before. It will be about 6" or 15.24 cm dia. at the pole faces and generate a field of about 1.5 T across a 1.5 cm gap and I plan to try to design it so that it can be air cooled, I'm not sure what type of steel or iron the yoke and pole pieces will be made of yet.
Thanks for any help
-Todd619
