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The hydraulic components of a cooling circuit for a dynamoelectric machine are eliminated in a totally air cooled dynamoelectric machine which includes a rotor (12) rotatable about an axis (14) and including a central stack (20) of ferrous laminations (22) defining a plurality of radially outwardly

The hydraulic components of a cooling circuit for a dynamoelectric machine are eliminated in a totally air cooled dynamoelectric machine which includes a rotor (12) rotatable about an axis (14) and including a central stack (20) of ferrous laminations (22) defining a plurality of radially outwardly directed circumferentially spaced poles (132), spaced shaft ends (24,26) on the axis (14) and extending from opposite sides of the stack (20) and a first air passage (46) in the stack (20). Magnetic journal bearings (54,56) and a magnetic thrust bearing (58,60) are provided for the shaft segments (24,26) and impellers (62) are located on opposite sides of the stack (20). A stator (16) surrounds the rotor (12) and includes windings (76) connected by end turns (94) located exteriorally of the stator (16). Axial winding coolant passages (152,158) are provided adjacent the windings (76) in the stator and radial passages (70,72) are located in the rotor and the stator and in fluid communication with an outlet (74) from the housing. Rotor coolant passages (130) are located in the stack (20) and all of the passages receive air from the impellers (62).

대표청구항 ▼

[ We claim:] [6.] An air cooled dynamoelectric machine comprising:a rotor rotatable about an axis and including a central stack of ferrous laminations defining a plurality of radially outward directed, circumferentially spaced poles, said poles being separated by axially extending grooves, shaft end

[ We claim:] [6.] An air cooled dynamoelectric machine comprising:a rotor rotatable about an axis and including a central stack of ferrous laminations defining a plurality of radially outward directed, circumferentially spaced poles, said poles being separated by axially extending grooves, shaft ends on said axis extending from opposite sides of said stack, and a first air passage extending between opposite sides of said stack;a first journal bearing journalling one of said shaft ends;a second journal bearing journalling the other of said shaft ends;a thrust bearing including a thrust disc on one of said shaft ends;impellers on each of said opposite sides of said stack and in fluid communication with said first air passage;a stator surrounding said rotor and having opposed ends and a plurality of axially extending windings connected by end turns located exteriorly of said stator;winding coolant passages extending through said stator adjacent said windings and terminating at said opposed ends;radial passages generally centrally located in said stator and extending between the radially inner and radially outer extremities of said stator;a housing containing said rotor, said stator, said bearings and said shaft ends and having an inlet in fluid communication with said first air passage, and at least one outlet radially outward of said stator;axial passages generally at or near the interface of said housing and said stator and radially outward of said windings and extending between said opposed ends;said axial passages and said radial passages being in fluid communication with said outlet;rotor cooling passages in said stack and extending axially between said opposite sides and in fluid communication with the impellers thereat, said axially extending grooves further being in fluid communication with said impellers; andradial passages in said rotor generally centrally thereof and in fluid communication with said rotor cooling passages and generally aligned with said radial passages in said stator.