Arrangement for cooling the rotor of an electric machine with a superconducting field winding

Patent · Tue Oct 27 04:00:00 EST 1981

OSTI ID:5737233

Weghaupt, E

Arrangement for cooling the rotor of an electric machine is disclosed that includes a superconducting field winding, a cold shield surrounding the winding, and a mixing chamber containing a phase mixture of coolant fed in, a stream of liquid coolant for cooling the winding and a stream of partially evaporated coolant for cooling the cold shield, the second stream being conducted through the cold shield and returned from the machine in an outer loop, the first stream being conducted through inner loops, through cooling canal sections of conductors, and returned to the chamber, the coolant in the loops being transported by the selfpumping effect of the rotor, the inner loops having radial entrance and exit branches distributed over the length and circumference of the rotor and winding, chamber sections associated with the inner loops, the chamber sections having an axial length and radial height forming pockets leading into the entrance branches for coolant which is cooler than the average temperature of the liquid phase and produced by evaporation at liquid level, a device for fanning-up a directional loop flow from weight and pressure differences of the canal sections of the inner loops, the chamber sections being distributed over the axial length and inner circumference of the rotor with the placement of the inner loops, and being disposed concentrically about the longitudinal axis of the chamber, each of the chamber sections having an entrance spaced from the axis, and an exit near an inner loop.

• Assignee: Kraftwerk Union Ag (Germany, Federal Republic of)
• Patent Number(s): US 4297603
• OSTI ID: 5737233
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COOLANT LOOPS
COOLING SYSTEMS
DESIGN
ELECTRIC FIELDS
ELECTRIC GENERATORS
ENERGY SYSTEMS
MATERIALS
MIXERS
PHASE CHANGE MATERIALS
PUMPING
ROTORS
SHIELDS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING GENERATORS
TURBOGENERATORS