Cc/neu Motors

[Pdelcast]

Originally Posted by Metallover

Just curious, what grade neodymium is used for the magnets? I have a n40 or something like that just to mess around with. Do you use n50?

No, we don't use N50 -- because they degrade with temperature -- they slowly lose their magnetism at high temps. In general, the higher the initial strength of the magnet, the worse they degrade over time with temperature.

We are using an N38UH magnet, that holds with applied temps of over 150C with no degradation.

Another company advertises N50 high temperature magnets --- don't be fooled. This is a complete lie. There is no such thing as N50SH or N50UH magnets. I've worked on several military motor projects where magnet strength was the most important factor, and cost was NO OBJECT. Even they couldn't get better magnets than around an N44SH, and that was at over $500.00 per magnet. So to think that a little Chinese motor company suddenly has an N50SH magnet when no one else in the world (including the US Army and major motor manufacturers) has one, is just silly. And after testing those magnets, I can now say for sure that it is UNTRUE. They are about N38 in strength, and less than SH grade for temperature (they degrade about 50% at 150C.)

And for the windings -- we are using US source polyimide (Kapton) insulated wire -- good for high temperature (rated to 200C.)