For cooling microelectrodes rotating propeller for flying model aircraft, usually set just before small anchor impeller. It blows air through the casing of the motor. The most intensively blown by the front part of the winding and a set of anchors.
Without the forced cooling can not do high — load engine running “on percale”. However, you can greatly increase the amount of cooling by moving the impeller for the anchor. And if also to cut the drive fans on the number of sectors corresponding to the number of collector plates, and NAPAT “petals” directly on the slats, the heat will be able to take from the most thermally stressed parts. For enhanced heat transfer “rotary cooler” elements are cut from copper or brass foil with a thickness of 0.15—0.2 mm.