I've stumbled around the net for a while, and came up w/ spheres, arcs, cylinders, cubes, and bars... Thats it.
I've been fairly amazed over the last year as to what "ya'll" come up with for answers, so I thought I'd pose the question here.

I am hoping acquire/make some trapezoidal shaped Neodymium (NdFeB) magnets, so as to avoid using epoxy to hold them in place. (Wide base, narrow top, mated slot, no adhesive needed... ... ...)

So I guess I'm also wondering if I can get the stuff they make these w/ in a raw (powder?) form, and then make my own shapes from a mold?
I do need to be able to set what N/S is, as I am "attempting" to make a generator, and this is mostly where I'm lost.
I've found a few places that sell the "powder". Any body here done it? Got a good supplier?


Any help is appreciated!
Poking fun is also ok, as I'm sure I've got it coming.

Regards,
Doug S.

Be much easier to get them made to any shape you want. Thats what the place I worked at does.

China is the biggest supplier, and has some really good manufacturers.

Generally I think they press them, then wireEDM the shape if required, then magnetize. You can choose where you want the poles to be.

Here's one of the places used.

http://www.umag.com.cn/page/f.html#

Thanks,

I will have to give them a try, and see how it works out.

It was a fairly interesting read. They make the magnet toys my 3 and 5 year old LOVE, and my wife/the vacuum HATE.


Doug S.

Late last week we had a servo that wouldn't turn, at all.
I found this on someone's desk today.
I had been contemplating saving my self the effort and just using some high end epoxy to hold the magnets on ... ... ... Not any more.

AND if you were curious about the strength of these magnets I was able to pick up the stator, solid steel, via the "removed" magnet. Convex contour to Convex contour !!!

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That kind of looks like a little magnetic coupling.


Will your application see any heat? choosing the right grade of ND magnet makes all the difference. The normal ND magnets you see on most rare earth resellers websites are the very basic and cheaper ND types, won't take any heat. There's a chart somewhere about it on the net, but I forgot where I had found it. I'll look later.
For the higher heat applications then its Smco magnets, for above 250C I think it was.

Oh, and Loctite 620 works really good at holding them in place on steel.