Accession Number : ADD013761

Title :   Cryogenic Wound Rotor for Lightweight, High Voltage Generators.

Descriptive Note : Patent, Filed 23 Apr 86, patented 19 Apr 88,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Oberly, Charles E ; Schlicher, Rex L

Report Date : 19 Apr 1988

Pagination or Media Count : 9

Abstract : Liquid hydrogen is used to completely cool all elements of the generator including bearings, stator conductor, rotor conductor, magnetic flux shield, and excitation mechanisms. By essentially immersing the generator in liquid hydrogen, cryogenic interface problems are minimized. The conductor windings will utilize pure metals such as aluminum to minimize the weight and the ohmic heat loss in the machine. Complications of liquid helium cooling for superconducting windings and quench phenomena due to thermal instabilities in the superconductors are eliminated. The use of extremely low resistance of liquid hydrogen cooled aluminum permits heat removal in the confined space of the rotor field winding at magnetic field and current density that can exceed that of superconductors. Because iron is not required in the generator, very high voltages can be generated.

Descriptors :   *PATENTS, ALUMINUM, BEARINGS, CONFINED ENVIRONMENTS, COOLING, CRYOGENICS, CURRENT DENSITY, EXCITATION, FLUX(RATE), GENERATORS, HELIUM, HIGH VOLTAGE, INTERFACES, IRON, LIGHTWEIGHT, LIQUID HYDROGEN, MAGNETIC FIELDS, METALS, PURITY, RESISTANCE, ROTORS, SHIELDING, SUPERCONDUCTORS, THERMAL INSTABILITY, WINDING

Subject Categories : Electric Power Production and Distribution
      Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE