Grundlegende vorbereitende Untersuchungen fluessigstickstoffgekuehlter elektrischer Antriebssysteme mit Hochtemperatur-Supraleitern (HTSL) (Vorstudie) Abschlussbericht

Abstract

The discovery of new ceramic HTC materials in 1986/87 with critical temperatures above 77 K inaugurates additional applications in the field of small electrical machines. Therefore the present research project deals with preparing investigations first on liquid nitrogen cooled electrical machines and machine components, that can be extrapolated to using HTC - wound motors. It is intended to investigate 77 K properties of cheap standard materials of the electrical machine construction and to calculate performance characteristics of liquid nitrogen cooled polyphase machines. With these results material demands on HTC wires will be detected. A systematic theoretical and metrological study of materials and machines results in the following summary of the present research project: High quality standard materials of the usual 300 K temperature range can be used at 77 K, on principle there are partly worse material properties (e.g. iron losses). Nevertheless small electrical machines of frame size 250 W have an increase in output coefficient of two to four times and at the same time clearly raised efficiencies compared to the 300 K type. Application advantages of small cryo or HTC machines clearly exceed principal disadvantages, so that cryo machines can be used profitably alreaedy now. After having developed a suitable HTC wire a favourably HTC machine performance will be achieved. (orig.)SIGLEAvailable from TIB Hannover: F96B1380+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman