Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"ac losses"”.
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A comprehensive electromagnetic analysis of AC losses in large superconducting cables
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Study of Second Generation High Temperature Superconductors: Electromagnetic Characteristics and AC Loss Analysis
… which covers their electromagnetic characteristics and AC loss analysis. Lorentz Force Electrical Impedance Tomography (LFEIT) is one of the most promising hybrid diagnostic scanners with burgeoning potential for biological imaging, particularly in the detection of cancer and internal …
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A high-current and low-loss high-temperature superconducting cable for nuclear fusion applications
… superconducting (HTS) coated conductors (CCs) to AC energy applications, including motors, power transmission, and fusion magnets, is their relatively high AC loss. In this dissertation, a novel high-current and low-loss HTS cable, Patterned superconductors for AC loss minimization and current …
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Planar Magnetics Design For Low-voltage Dc-dc Converters
… are to design planar magnetic devices based on accurate electromagnetic analysis and miniaturize magnetics within desired low profile as well as small footprint. A novel methodology based on FEM simulation is proposed. By introducing Maxwell 2D simulator, optimal interleaving structures can be …
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Electrical characterization of high temperature superconductors as a function of temperature
… for two different BSCCO-2223/Ag tapes manufactured by Vacuumschmelze (VAC). The critical currents for the two VAC samples were measured as a function of magnetic field strength. The critical current of each sample was well described by the generalized Kim model. The critical current was also …
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AC loss in MgB2-based fully superconducting electric machines
Superconducting electric machines have shown potential for dramatic increases in specific power for applications such as offshore wind generation, turbo-electric distributed propulsion in aircraft, and ship propulsion. Superconductors exhibit zero loss in dc conditions, though ac current produces …
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Second-generation high-temperature superconducting coils and their applications for energy storage
… carbon emissions. Recently the massive manufacture of high-temperature superconducting (HTS) materials has enabled superconductivity to become a preferred candidate to help generation and transportation of cleaner energy. One of the most promising applications of superconductors is …
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Tailoring Superconductor and SOFC Structures for Power Applications
… energy. However, production costs and energy losses prohibit widespread adoption of these technologies. This thesis investigates low-cost methods to tailor the structures of HTS wires and SOFCs to reduce these energy losses. Section I focusses on methods to produce filamentary HTS coated …
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Thermal Hydraulic numerical analysis of Fusion superconducting magnet systems
… the International Thermonuclear Experimental Reactor (ITER) is in progress and efforts are being made to extend ITER to DEMOnstration Power plant (DEMO) with the purpose to harness the fusion energy for peaceful and constructive purposes. ITER uses the sueperconducting magnet systems for …
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Development of REBCO Tapes on Non-Metallic Flexible Substrates for RF Applications
… radio-frequency (RF) applications such as surface receiver coils for magnetic resonance imaging (MRI). Second-generation high-temperature superconductors (2G-HTS) are well developed for direct current (DC) applications. However, alternating current (AC) losses because of eddy currents in …
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DESIGN AND STUDY OF THE IRIS 10 T ENERGY SAVING DIPOLE MAGNET FOR ACCELERATORS: ESMA
… materials is progressively refining the manufacturing of a new class of conductors: REBCO tapes. Although REBCO was discovered in 1987, tape manufacturing suitable for magnet windings has only recently been optimized. REBCO tapes belong to the class of High Temperature Superconductors (HTS), a …
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Transport AC loss in high temperature superconducting coils
… the problem of calculating and measuring AC losses in superconducting coils is addressed, with a particular focus on the transport AC loss of coils for electric machines. In order to model the superconducting coil's electromagnetic properties and calculate the AC loss, an existing two …
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Electromagnetic-thermal Characteristics of Conductor on Round Core (CORC) Cables
… exhibit more significant current-carrying capacity while reducing alternating current (AC) losses. They are promising candidates for low-loss power transmission and low-inductance high-field magnets. This thesis carries out exhaustive research on the electromagnetic-thermal characteristics of …