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 20 of 59 for “"Electric machines"”.
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Electrothermal design exploration of electric machines using hollow conductors
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01
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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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Analysis of superconducting electric machines for naval ship propulsion.
Thesis. 1978. Ocean E.--Massachusetts Institute of Technology. Dept. of Ocean Engineering.
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Investigation of qualification methods for electric machines in urban air mobility application
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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System-level optimization of high-specific-power electric machines for aircraft propulsion applications
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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Analysis and design of multipole, super-conducting rotating electric machines for ship propulsion.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1974. M.S.
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High-frequency, high-pole count design for improving specific power density of electric machines
… design for improving specific power density of electric machines for weight and/or volume sensitive applications. Although electric machine designs have reached a limit in terms of efficiency, reliability, and cost, newer applications such as in aviation or the oil and gas industry are demanding …
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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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Modeling brake specific fuel consumption to support exploration of doubly fed electric machines in naval engineering applications
… The ever increasing and complex demands for electrical power increases the motivation and interest in innovative technologies that improving current design concepts. Incorporating doubly fed electric machines (DFEM) into the power and propulsion design architecture enables the efficiency …
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An Investigation of Boundary-Based Field Analysis Methods for Electric Machines: The Schwarz-Christoffel and Boundary Element Methods
The results indicate that boundary-based methods, although not ideal for machine design by themselves, have certain aspects that complement traditional domain-based methods. They therefore merit further study in this context.
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A framework for dynamic characterization and short-term thermal capability assessment of electric machines and inverters in motor drives
… in the fields of automotive traction and more-electric aircraft systems. These applications have peak-duty aspects that intermittently stress the drive. To account for this stress, conventional methods dating back to the 1940s have yielded oversized and expensive designs. This dissertation …
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Actively shielded air-core superconducting machines: optimization and design considerations
Superconducting electric machines hold immense promise for increases in power density, which is enabling for certain high-performance applications such as electric aviation and off shore wind generation. However, key challenges include limitations of magnetic materials and containment of fields …
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Rotordynamic assessment for a permanent magnet synchronous motor
… in particular, combined with high magnetic and electrical loading, are key enablers for obtaining high specific power in electric machines. The rotor described in this thesis pushes the tip speed to about 80% of the speed of sound. An outer rotor design with a carbon-fiber retaining ring on the …
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An environmental analysis of injection molding
… molding machine type (hydraulic, hybrid or all-electric) has a substantial impact on the specific energy consumption (SEC), energy used per kg of processed polymer. The SEC values for hydraulic, hybrid and all-electric machines analyzed are 19.0, 13.2 and 12.6 MJ/kg respectively (including …
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The Power Absorbed by a 60 in. Circular Saw and Other Wood Working Machines
… the power required to run various wood working machines of standard make, paper making machinery, and dynamo electric machines.</p>
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Shipboard Fault Detection Methods for Condition-based Maintenance
… to compressors, pumps, fans, and other shipboard electric machines.
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Sensing for Electromechanical Systems
… systems, for example, pumps, compressors, and electric machines, are the foundation of modern society. Condition monitoring of these systems is crucial for efficient operation and operator safety. Modern electronics enable new developments in electromechanical system condition monitoring. In …
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Finite element analysis of 3D electric machine problems
… efficient numerical simulation tool to analyze electric machine problems. As one of the largest fossil energy consumers, electric machines have to be designed properly with robust simulation tools that are capable of handling the inherent complexity, such as multiple materials, complicated …
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Development of a high power density rotor
High specific power electric machines are crucial to enabling electric and hybrid-electric aircraft. In order to meet this need, a high specific power electric machine with an unconventional topology is being developed. The topology creates mechanical challenges including expansion due to high speed, …
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High-frequency, slotless permanent magnet synchronous motor for aircraft propulsion
While electric machines have already shown impact in applications where efficiency, reliability, and cost are critical, newer applications are instigating development of next-generation, lightweight, power-dense motors. The benefit of lower weight in a motor is especially attractive when considered …
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