Abstract: A two-pole generator rotor assembly (100) including a core (120) and a shaft for mounting the core (120). The shaft includes a pair of shaft end portions (117, 119), with each of the shaft end portions (117, 119) including an integrally formed axially extending retaining wedge portion (134) adapted to mount and retain the core (120) in the rotor assembly (100). The wedge retaining portions (134) include opposed surface portions arranged so as to define therebetween a slot for accommodating the core (120) when the shaft end portions (117, 119) are assembled so that the core (120) and shaft end portions (117, 119) form a rotor subassembly. An outer containment (114) is shrink fitted on the rotor subassembly. A tongue and groove connection (38a, 39) is provided between the respective retaining wedge portions (134) and associated shaft end portions (117, 119) so as to interlock the two end shaft portions (117, 119) together.

Abstract: Inefficiencies in heat exchange between the end turns 20 of a dynamoelectric machine including a stator 10 and coolant carrying tubing 22 wrapped about the end turns 20 as a result of thermal growth of the end turns 20 may be avoided through the use of a retainer 28 for the tubing 22 and having a coefficient of thermal expansion that is substantially less than the coefficient of thermal expansion of the end turns 20.