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Full-Text Articles in Physics
Design And Development Of A Superconducting Induction Motor, Terry Bowness
Design And Development Of A Superconducting Induction Motor, Terry Bowness
Opportunities for Undergraduate Research Experience Program (OURE)
The discovery of high-Tc superconductors has led to the development of a number of experimental superconducting motors. This report documents the design, construction, and methods of evaluating the performance of an induction motor with a high-Tc superconducting rotor. While others have utilized the Meissner effect, our superconducting motor works due to Lenz’s law. In theory such a device will act as an induction motor only during start-up, after which its behavior is more like that of a synchronous machine. With a one-pole copper squirrel cage providing start-up torque two high-Tc discs encased in the rotor core act …
Automated Seebeck Measurements Applied To Conducting Ceramics, J. S. Shapiro
Automated Seebeck Measurements Applied To Conducting Ceramics, J. S. Shapiro
Opportunities for Undergraduate Research Experience Program (OURE)
The Seebeck coefficient (also known as thermopower) is important in the characterization of conducting ceramics because it is very sensitive to the electronic structure. An apparatus was built during the Fall of 1990 and Spring of 1991 which was designed to measure the Seebeck coefficient in small high-resistivity samples in the temperature range from 80 K to 450 K. A reproducible thermocouple-to-sample electrical and thermal contact technique was found to be important to data accuracy but difficult to achieve. The goals of this project were to improve the thermocouple block design to give better thermal and electrical contact with the …