Patent ID: 7462962
Filing Date: 2008-12-09
Classification: H02K

Abstract:
1. A rotating electrical machine comprising: a rotor having field windings and a stator about said rotor; a cooling system for the machine including a plurality of generally axially extending subslots opening through opposite ends of the rotor and underlying respective portions of the rotor field windings and a plurality of ducts extending through the field windings adjacent opposite end portions of the rotor in communication with the subslots for receiving a cooling medium flowing axially along said subslots and discharging the cooling medium into a gap between the stator and rotor; said stator including cooling medium inlet ducts intermediate opposite end portions of the machine for flowing cooling medium toward said gap and said rotor, said rotor having a plurality of inlet ducts and outlet ducts intermediate opposite end portions of the rotor for flowing the cooling medium received from said intermediate stator ducts inwardly along said intermediate rotor inlet ducts and outwardly along said intermediate rotor outlet ducts into the gap.