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.
Results
Showing 1 to 11 of 11 for “"Circulating currents"”.
-
Sheath currents, sheath losses, induced sheath voltages and apparent conductor impedances of metal sheathed cables carrying alternating currents
… it is proposed to consider sheath voltages, currents and losses and line constants for one or two circuits of single conductor cables with non-magnetic metallic sheaths. Residual earth currents, abnormal sheath voltages during failures, sheath proximity losses, and the results of special …
-
Measurement and on-chip control of a niobium persistent current qubit
… Josephson junctions. Its two quantum states have circulating currents in opposite directions which can be measured by a dc SQUID magnetometer. This work examines a persistent current qubit fabricated in niobium, using Lincoln Laboratory's DPARTS process. Measurements of the niobium qubit show a …
-
Testbed development and experimental validation of a high-power slotless stator
… of tight manufacturing tolerances to minimize circulating currents and associated losses. In addition, this thesis describes work on testbed development. Specifically, the thesis discusses how to determine effective winding and resistor combinations to allow for testing the machine as a …
-
Exploring exotic superconducting order in La-based cuprate materials using Josephson interferometry
… find evidence for granular superconductivity and circulating currents in LSCO near criticality.
-
Electromagnetic flux monitoring for detecting faults in electrical machines
… detection, such as stator phase current and circulating currents between the parallel branches of the stator winding. The following faults were investigated in this thesis: a turn-to-turn short circuit in the stator winding; rotor cage-related faults (breakage of rotor bars); static and …
-
Magnetic properties of graphite and Bi2Sr2CaCu2O8+δ
… graphite. The possibility of creating permanent circulating currents around artificial holes in highly oriented graphite was studied by highly sensitive magnetization measurements. The obtained results provide hints for the possible existence of superconducting regions inside the bulk highly …
-
Zero-voltage switched resonant and PWM converters: design-oriented analysis and performance evaluation
… Efficiency optimization requires minimizing the circulating currents which are directly proportional to the reactive energy required by the resonant tank. The comparison of the different converters is based on the reactive energy required for ZVS. The study considers resonant converters with …
-
Position Estimation in Switched Reluctance Motor Drives Using the First Switching Harmonics of Phase Voltage and Current
… measurement method. In general, when applying circulating currents within the body of a ferromagnetic material under conditions of a time varying magnetic flux, the effects of eddy current losses and resistance changes due to heating decrease the magnetic field strength and thereby the reduced …
-
Analysis of Inductor-Coupled Zero-Voltage-Transition Converters
… (PL) concept. Throughout an effort to eliminate circulating currents of inductor-coupled (IC) ZVT converters, the S3L ZVT cell is developed. The proposed cell allows a single auxiliary switch to achieve zero-voltage conditions for both the top and bottom main switches, and it achieves the same …
-
Design of High-Density Filter Building Blocks for SiC-based Three-Phase Power Converters
… superior harmonic attenuation for grid-side currents at the expense of low harmonic filter volume. Therefore, interleaved converters are explored in Chapters 2 and 3. However, to block inter-channel circulation, additional use of coupled inductors (CI) can outweigh the benefits of …
-
A High-Efficiency Hybrid Resonant Microconverter for Photovoltaic Generation Systems
… while achieving high efficiency through low circulating currents, zero-current switching (ZCS) of the output diodes, zero-voltage switching (ZVS) and/or ZCS of the primary side active switches, and direct power transfer from the source to the load for the majority of the switching cycle. Each …