Turnigy/Astro magnet article from Wikipedia

[SoSauty]

I've read that Turnigy RC motors use 'Neodymium' magnets while Astro 32XX motors use 'Samarium cobalt' magnets.

I don't understand much of this article. Please comment:
http://en.wikipedia.org/wiki/Neodymium_magnet

Comparison of physical properties of sintered neodymium and Sm-Co magnets[3]

 

[Miles]

Loads of good info, here:
http://www.mceproducts.com/knowledge-base/article/article.aspx

 

[rhitee05]

Cliff Notes version:

Neodymium magnets generally have more strength at room temperature. SmCo magnets, however, hold their magnetism better with temperature. This means that SmCo magnets will generally be stronger at high temperatures. Neo magnets also will de-magnetize at a lower temperature than SmCo, depending on the temp grade. SmCo lets you run the motor harder and hotter, but are more expensive.

 

[SoSauty]

BINGO! Miles/Rhitee05,

Your link led me right to what I wanted to know, do the Astros or Turnigys tolerate higher running temps. Read for yourself, info is in 1st table near the top
http://www.mceproducts.com/knowledge-base/article/article-dtl.asp?id=32

But really, I've noted some power fade at 200f w/ the Astro 3210 (outer can). Other Astros have had epoxy failures at 230-280f, quite a bit under 250C. So, I suspect that the winding epoxy is the weak link for pushing Astros and where cooling needs to be directed.
*Cooling winding/tougher epoxy leaves the grease in the bearings vulnerable, 275-325f limit

So, any rough guesses how many amps a standard 3220, a heatsinked 3220 w/ 2Xs surface area, and a CPU heatsink w/ 8Xs surface area would handle (peak)

 

[Arlo1]

Very intersting.

 

[Miles]

So, any rough guesses how many amps a standard 3220, a heatsinked 3220 w/ 2Xs surface area, and a CPU heatsink w/ 8Xs surface area would handle (peak)

SS,

You will need to specify the winding (6t, 7t etc.) if you reference the current. To avoid this need, reference the torque.