Patent ID: 7633193

Claim:
A cooling system for an electrical motor or generator, comprising: a first cooling loop including a cooling jacket wherein a liquid coolant circulates along said cooling jacket, wherein said first cooling loop extracts heat the cooling jacket from an iron stack and a winding of a stator of said electrical motor or generator and wherein said cooling jacket is in direct contact with said iron stack; a second cooling loop, wherein said second cooling loop extracts heat from end turns of said winding of said stator, a rotor, and bearings of said electrical motor or generator, wherein said second cooling loop is independent from and disconnected to said first cooling loop, and wherein said second cooling loop is operated simultaneously to said first cooling loop; a compressed gas as a cooling medium, wherein said compressed gas flows in said second cooling loop and extracts heat through direct contact with said stator winding end turns, said rotor, and said bearings wherein said stator winding end turns are unpotted; and a heat exchange system, wherein at least said first cooling loop is a closed loop and passes through said heat exchange system.