Quote:
Originally Posted by lutach
Very thin carbon fiber tube will do the trick. It's been used in very high RPM motors.
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Yes, we tried that. Kevlar actually worked better in our testing, up to about a limit of 30K gs. We've also tried stainless steel sleeving, and titanium sleeving -- they worked well but increased eddy current losses to the point where it wasn't worth using the sleeving.
You really don't want to go above about 45KRPM anyway, hysteresis losses become really big really fast at those commutation frequencies.