I am trying to design some toroidal electromagnets.
I am trying to design some toroidal electromagnets.
(OP)
I am trying to design toroidal ring electromagnets (radially magnetised) - but am having considerable problems with finding a suitable core material - pure iron is prohibitively expensive, and the core is something that could be produced easily with powder technology - but I find I am batting zero with attempts to find a suitable material/process. Laminated cores are not appropriate.
Any ideas - materials/suppliers??
HughS
Any ideas - materials/suppliers??
HughS





RE: I am trying to design some toroidal electromagnets.
Don
Kansas City
RE: I am trying to design some toroidal electromagnets.
http://www.mag-inc.com/
I don't think they do one-off designs though. May be worth a check.
RE: I am trying to design some toroidal electromagnets.
Mike
RE: I am trying to design some toroidal electromagnets.
keep the suggestions coming! and many thanks - I'm impressed with this site!
Cheers Hugh
RE: I am trying to design some toroidal electromagnets.
Don
Kansas City
RE: I am trying to design some toroidal electromagnets.
If a particular material has too much remanance for your job, couldn't you just use less of it, to compensate?
Otherwise, Don's suggestion of standard size toroids is a good one.
RE: I am trying to design some toroidal electromagnets.
Unfortunately conventional toroids won't work -
the magnetic axis has to be radial - which means that a coil that is effectively circumferentially wound, has to be inserted in the toroid-like form. This is what makes things difficult. We've figured out the topology - but stuck on the materials and fabrication - I can machine the bits out of bar stock - assuming I can find it (250 dollars - never mind the freight) for a 1' bar of 3" pure iron. - cost about 500 bucks to freight it here! - and i'd need about 3 bars. - so sintered powder metallurgy would appear to be the only way to go - but- what materials - and who could do it.
We may be '1st world' here - but I sometimes wonder!
Thanks - all suggestions welcome
Hugh Spencer
RE: I am trying to design some toroidal electromagnets.
http://www.amidoncorp.com/aai_guide_to_powder.htm
or here
http://
RE: I am trying to design some toroidal electromagnets.
What exactly does the core look like? I'm picturing something like a giant lockwasher with protrusions all about the circumference, each one having its own winding...like a motor stator. Is that what you're talking about?
Don
Kansas City
RE: I am trying to design some toroidal electromagnets.
This is why I'd kill for an e-mail friendly (linked) sketch pad - sort of like the old Mac Draw vector drawing program - the whole application is 50K - and I'm sure some smart cookie could re-visit it and make it work on a wider platform. (If wishes were horses......) On forums like this it would be invaluable - 'Hey Joe - check out this sketch - have I got the bias resistor right on Q3??") !!
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