Patent ID: 6553773
Filing Date: 2003-04-29
Classification: F17C,F25B,H02K,Y02E

Abstract:
A method for cooling a super-conducting field winding coil in a rotor of a synchronous machine using an elevated cryogen storage device comprising:a. storing cryogenic cooling fluid in the tank, wherein the tank is elevated above the rotor; b. allowing the cooling fluid to flow under the force of gravity from the tank to the rotor; c. cooling the field winding coil with the cooling fluid; d. returning the cooling fluid to the tanks; e. condensing a vapor portion of the cooling fluid in the tank or in the return line; f. interrupting step (e) and ceasing condensing of the vapor portion of the cooling fluid; g. during step (f) continuing the flow of cooling fluid from the tank to the rotor.