Newbie Q regarding electromagnet cores
Newbie Q regarding electromagnet cores
(OP)
Is there any real advantage to using very high permeability materials as the core of a cylindrical shaped electromagnet versus an iron core?
In particular, I am interested in generating an attraction (or repulsion) force between a permanent magnet and an electromagnet separated by about 1/4 inch.
I was under the impression that the core of the electromagnet is not critical unless saturation of the core may be a problem. Is that correct?
Thanks,
AJ
In particular, I am interested in generating an attraction (or repulsion) force between a permanent magnet and an electromagnet separated by about 1/4 inch.
I was under the impression that the core of the electromagnet is not critical unless saturation of the core may be a problem. Is that correct?
Thanks,
AJ





RE: Newbie Q regarding electromagnet cores
The very highest saturation flux density is obtained from cobalt alloys which are expensive e.g. Vacoflux from Vacuumschmeltze, Bsat approx. 2.2T (22000gauss). That is only about 10% higher than mild steel, so you may as well just use steel.
Hopefully someone else can recommend a suitable grade of iron or steel, I assume you are in the US and I'm not familiar with the grades over there.
RE: Newbie Q regarding electromagnet cores
RE: Newbie Q regarding electromagnet cores
What if I don't have enough amp-turns to saturate even the iron core? (Currently using about 900 Amp-turns as I am very space and power limited)
In that case is there any advantage to using a more exotic core?
Also, can anybody reccommend a good reference book for electromagnet design?
Thanks,
-AJ
RE: Newbie Q regarding electromagnet cores
Electromagnetic Devices - Herbert Rooters is one
RE: Newbie Q regarding electromagnet cores