Cooling of rotor conductors of dynamo-electric machines

Claim 1

A COOLING ARRANGEMENT FOR ROTOR CONDUCTORS OF DYNAMO-ELECTRIC MACHINES OF THE TYPE INCLUDING A ROTOR HAVING AXIALLY-EXTENDING CONDUCTOR-RECEIVING SLOTS THEREIN, CONDUCTORS INCLUDING SLOT-EMBEDDED PORTIONS DISPOSED IN SAID SLOTS AND EXTENDING AXIALLY OF THE ROTOR AND OTHER PORTIONS DISPOSED EXTERIORLY OF THE ROTOR EXTENDING GENERALLY CIRCUMFERENTIALLY THEREOF, EACH CONDUCTOR HAVING INTERNALLY THEREOF CONDUITS HAVING CLOSED OPPOSITE ENDS, COOLANT MEDIUM WITHIN THE CONDUITS, EACH CONDUIT HAVING ONE OF THE CLOSED ENDS DISPOSED IN THE CONDUCTOR AT A POSITION ALONG ITS AXIAL EXTENT INTERMEDIATE THE ENDS OF THE SLOT-EMBEDDED PORTIONS OF THE CONDUCTORS AND THE OPPOSITE CLOSED END BEING DISPOSED IN A PORTION OF THE CONDUCTOR LOCATED EXTERIORLY OF THE ROTOR SO THAT A CLOSED COOLING CIRCUIT IS ESTABLISHED BETWEEN THE CLOSED ENDS OF EACH CONDUIT, AND MEANS OPERATIVELY RELATED WITH THE ROTOR FOR CIRCULATING COOLING FLUID AGAINST AT LEAST THE CONDUCTOR PORTIONS WITHIN THE SLOTS WHEREBY HEAT DEVELOPED IN THE PORTIONS OF THE CONDUCTORS LOCATED EXTERIORLY OF THE ROTOR IS REMOVED BY THE COOLANT MEDIUM CIRCULATING IN THE CONDUITS RESPONSIVE TO THERMAL-SYPHON EFFECT AND CENTRIFUGAL FORCE DUE TO ROTATION OF THE ROTOR AND GIVEN UP TO THE COOLING FLUID IN CONTACT WITH CONDUCTOR PORTIONS WITHIN THE SLOTS.