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

US4297603A · kind A · utility

Assignee

• Kraftwerk Union Aktiengesellschaft · DE

Inventor

• Erich Weghaupt · Mülheim, DE

Key dates

• Filing date: Nov 15, 1979
• Grant date: Oct 27, 1981
• Expiry date: Nov 15, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S505/878
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Arrangement for cooling the rotor of an electric machine, including 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 self-pumping 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 cham…