Patent ID: 6215212
Filing Date: 2001-04-10
Classification: H02K

Abstract:
A dynamoelectric machine comprising:a stator having a rotor receiving opening;a rotor including a stack of ferrous laminations having opposed ends;a central opening in said stack and located on an axis of rotation for the rotor;a cylindrical sleeve extending through the stack through said central opening and orienting the laminations with respect to one another;a pair of annular clamping assemblies, one at each end of said stack, and clamping against said stack and said sleeve, said clamping assemblies including fluid passages provided with coolant pumping vanes;a pair of spaced shaft segments, one at each end of said stack and abutting the associated clamping assembly, and being located on said axis;a single tie bolt having a central section extending through said sleeve in spaced relation thereto to define an annular coolant passage between said sleeve and said tie bolt that extends between said opposed ends and said clamping assemblies and in fluid communication with said vanes, said tie bolt further interconnecting said shaft segments and being in tension to provide a clamping force to said clamping assemblies, said tie bolt, at one end, being enlarged in relation to said central section and having a chamber thereat;a coolant inlet to said chamber;at least one opening in said tie bolt extending between said chamber and the exterior of said tie bolt and in fluid communication with said annular coolant passage; andmeans journalling said shaft segments for rotation about said axis and within said rotor receiving opening.