Resistor-containing cryogenic current lead
US4164671A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1978 |
| Grant date | Aug 14, 1979 |
| Priority date | — |
| Expiry date | May 22, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/878
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Resistors disposed for vaporizing vapor-trap liquid coolant are individually connected in series with each of the high-aspect-ratio current leads connected to a superconductive coil of an intermittently operable electromagnetic machine. The portion of each lead extending from a coolant vapor return duct (through which the leads enter the machine) and terminating within the coil chamber is of hollow structure. The terminal length of each such portion is turned radially outward and its open outer end is submerged in the pool of liquid coolant in the chamber. The vapor traps are individually defined by liquid coolant in the hollow terminal length of each lead. Coolant vaporized in each trap flows in lead-cooling relationship with the corresponding hollow lead portion. The high-aspect-ratio leads reduce the heat conducted by the leads during current-off periods, while each resistor produces sufficiently large vapor flow during current-on periods to accommodate the increased cooling load developed by these leads during the latter periods. Intermittent operation can be accommodated with minimal coolant consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.