Patent ID: 6679066
Filing Date: 2004-01-20
Classification: F17C,F25B,H01F

Abstract:
A cryogenic cooling system for superconductive electric machines comprisinga superconductive electric machine; a forced flow refrigerant transfer system for cooling the superconductive electric machine; a circulation pump for internal circulation within the refrigerant transfer system; wherein said refrigerant transfer system comprises a cryocooler; and further comprising a cold box for housing said cryocooler and said transfer system; wherein said cold box comprises: at least one closed cycle cryogenic refrigerator; a heat exchanger; at least one rejection heat exchanger provided on said cryogenic refrigerator; and piping for forcedly circulating the refrigerant gas; and an ejector for directly returning a part of the refrigerant gas returning from the superconductive electric machine to said rejection heat exchanger.