Pma Permanent
Would rust buildup on a Permanent Magnet Stator cause high drag?
I have rust and rust dust on a PMA stator. It is not making contact with outer core but does have high drag. Is this the cause?
It certainly could be. In a brushless motor the air gaps between the permags and the electromags is very small and critical, so any foreign matter in that gap would increase drag. Rust is iron oxide which can still be magnetised and would contribute to the extra drag.
Or, it might be just tight bearings, or partially seized bushes.
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