Because the motor cooling is mostly limited by heat transfer to the case from the armature, and not by heat transfer from the case to the outside air, you will mostly just make the surface of the motor cooler, not the parts that you actually care about cooling (regardless of the method used).
Quote:
Originally Posted by Al Skierkiewicz
Since the CIMs are sealed there is virtually no effective way to cool them. The majority of heat is built up in the armature. the only path for this heat to escape to the outside of the motor is through the end shafts, bearings and then to the end plates. Some heat can be radiated from the armature through the air to the magnet structure and case but this will produce very little cooling.
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