Dynamoelectric machine with rotor ventilation system including exhaust coolant gas diffuser and noise baffle

Claim 1

A dynamoelectric machine comprising: a stator with a core and coil windings having end turns extending axially beyond ends of said core; a rotor centrally disposed on a shaft for rotation within said stator; said rotor comprising a body portion with axially opposing end faces, said body portion having a plurality of axially extending coil slots in each of which are located coils with end turns extending axially beyond each end of said rotor body portion, said end turns having radially directed coolant passages; a retaining ring located radially around said rotor end turns and having radially directed coolant passages communicating with said end turn coolant passages, said retaining ring and said rotor end turns being substantially directly radially inside said stator end turns, a coolant inlet duct for supplying a coolant gas to radially inward ends of said end turn passages, said inlet duct having a first wall axially remote from said end turns and a second wall extending close to said end turns and said retaining ring; and, a stator end turn shell structure having a smoothly curved configuration with an inner portion affixed to said stator end turns proximate said core and an outer portion affixed to said stator end turns proximate the axially outer extremity of said end turns, said shell structure substantially shielding said stator end turns from coolant passing outward through said passages of said rotor end turns and said retaining ring and confining coolant so passing to a region proximate an outer surface of said inlet duct second wall to define an outlet passage facilitating coolant flow therethrough.