Direct current electrical machine cooled by external fan, has direction of flow of at least parts of cooling air flow passing via commutator to external fan

摘要

The direct current machine (6) has a stator plate packet (22) with stator windings, a rotor with rotor windings and a commutator with commutator brushes, where heat sources are subjected to a cooling air flow (18). The direction of flow of at least parts of the cooling air flow passes via the commutator to the external fan (2).