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 20 of 46 for “"Electrical Machines"”.
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Multiphase Electrical Machines for Vehicular Traction
L'abstract è presente nell'allegato / the abstract is in the attachment
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Additive Manufacturing of Electrical Machines and Electronic Devices
… in the additive manufacture of electronics and electrical machines have led to successful demonstrations of 3D-printed passive (e.g., resistors, capacitors, inductors) and active (e.g., transistors) electronic components, as well as magnetic cores and power transfer devices. However, each new …
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Electromagnetic flux monitoring for detecting faults in electrical machines
… was assessed in comparison with some other electrical parameters used for fault 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 …
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Electro-thermal design and optimization of cryocooled electrical machines
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Transformations and stability of electrical machines in nearly ideal operation
Includes bibliographical references.
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"Development of high-frequency ""airgap"" windings for high-power density electrical machines"
This Thesis was approved for publication on 2016-04-07 at 16:22.
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Approaches for electromagnetic and loss analysis in electrical machines with superconducting AC windings
L'abstract è presente nell'allegato / the abstract is in the attachment
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Signal processing techniques for on-line partial discharge monitoring of high voltage electrical machines.
Large alternating current electrical machines are found everywhere in modern industry. Traditionally, electrical plants have been highly reliable, primarily because the complexity of their electrical design means that they are generously over-rated. However, modern rotating electrical machines are …
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Performance evaluation of three and multi-three-phase electrical machines using off-line mapping
L'abstract è presente nell'allegato / the abstract is in the attachment
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Numerical Investigations of Air Flow and Heat Transfer in Axial Flux Permanent Magnet Electrical Machines
… in air cooled Axial Flux Permanent Magnet (AFPM) electrical machines is carried out. Efficiency of electrical machines is strongly influenced by an effective cooling which is provided by forced convection: air enters the generator through the opening in the machine enclosure and leaves it …
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Insulation considerations and qualifications for form-wound air-core armature windings in high-frequency electrical machines
High specific power electrical machines are a key enabling technology in hybrid electric aircraft. Specific power can be increased by increasing the machine's electrical loading and operating frequency, which often increases the machine's operating temperature and requires a strong insulation …
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Optimisation of electrical machines using data-driven dynamic thermal models and surrogate-based multi-objective evolutionary algorithms.
This thesis addresses two challenges that electrical engineers face when designing electrical machines: managing heat generated during operation and reducing the time required to obtain optimal designs. Heat negatively affects machine performance, shortens lifespan, and can ultimately cause …
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Regression Function Characterization of Synchronous Machine Magnetization and Its Impact on Machine Stability Analysis
… core significantly affects the performance of electrical machines. In the performance analysis of electrical machines, an accurate representation of the magnetization characteristics in the machine model is important. As a part of this research work, two new mathematical models are proposed to …
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Regression Function Characterization of Synchronous Machine Magnetization and Its Impact on Machine Stability Analysis
… core significantly affects the performance of electrical machines. In the performance analysis of electrical machines, an accurate representation of the magnetization characteristics in the machine model is important. As a part of this research work, two new mathematical models are proposed to …
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Terminal Behavioral Modeling of Electric Machines for Real-time Emulation and System-level Analysis
… systems. With ever-increasing application of electrical machines by means of electrification of vehicles, airplanes and shipboards, detailed study of the relating dynamics is very important to ensure the proper implementation and stable behavior of the overall system. In this work, the …
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Design of a High Specific Power Electric Machine for Turboelectric Propulsion
… for aviation, in which a gas generator core electrically drives motor-powered propulsors, are limited by the mass and losses of the electric components introduced into the drivetrain. These propulsion systems are predicted to result in a 15\% fuel savings provided that megawatt-class …
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Magnetic properties measurement of new magnetic material : SOMALOY 700 (5P)
… to the evolution of technology. The invention of electrical machines has enabled human to do their chores with easier and more comfortable way. Presently, electromagnetic technology is improving day by day and most of the current electrical machines require the magnetic cores to operate at higher …
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Analytical representation and finite element analysis of magnetically-geared permanent magnet machines
… and contactless power transfer. Conventional electrical machines can be combined with magnetic gears to form a compact device called a magnetically-geared machine. They have found their way into mechatronics, wind turbines, wave energy generation and electric vehicles. Such devices can be …
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Simulação de falta no enrolamento de campo de geradores síncronos pelo método dos elementos finitos
… through simulation of a typical machine of thermoelectrical power plants moved by heavy duty stationary turbines (not aeroderivative). It is applied a known detection technique, the air gap magnetic flux variation analysis, adapted to a computational simulation model. The simulation is performed …
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