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 20 for “"high specific power"”.
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Electromagnetic fault analysis for high specific power permanent magnet synchronous machine
… the electromagnetic fault analyses for a high specific power 1 MW permanent magnet synchronous electric machine designed for aerospace applications. As the high specific power of 13.3 kW/kg of the machine is to be achieved by pushing the design parameters such as mechanical speed, electric …
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Design of a High Specific Power Electric Machine for Turboelectric Propulsion
… 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 electrical machines (EMs) and …
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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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Electro-thermal design and optimization of high-specific-power slotless PM machine for aircraft applications
The student, Xuan Yi, submitted this Dissertation for approval on 2020-07-07 at 07:38.
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Testbed development and experimental validation of a high-power slotless stator
… the performance of components of a novel high-specific-power permanent magnet synchronous machine (PMSM) for electric aircraft propulsion. An important thrust in current aerospace research is aircraft electrification, including propulsion system electrification. For an electrified …
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Technological assessment and evaluation of high power batteries and their commercial values
… Vehicle (HEV) energy storage market as it has higher specific energy and energy. However, in order to improve Li-ion battery technology to fulfill the' HEV energy storage requirements, a very high specific power characteristic is needed to boost its commercial attractiveness. The high specific …
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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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Rotordynamic assessment for a permanent magnet synchronous motor
High speed and high rotor tip-speed, 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 …
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Superconducting rotor with self-contained thermal management system
… (SC) electric machines can reach incredibly high specific power and are especially desirable for weight-sensitive applications including aircraft electric propulsion. However, thermal management of the cryogenic environment has posed challenges to building practical aerospace SC machines. …
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Design, modeling, fabrication and testing of a piezoelectric microvalve for high pressure, high frequency hydraulic applications
… hydraulic amplification microvalve for use in high specific power hydraulic pumping applications was designed, fabricated, and experimentally characterized. High frequency, high force actuation capabilities were enabled through the incorporation of one or more bulk piezoelectric material …
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Modeling, Manufacturing, and Experimental Validation of an Electric Machine for Aircraft Propulsion
… a 1-MW electric machine which achieves the specific power necessary for hybrid-electric aviation: 13 kW/kg [1]. The models for torque and core loss used in the design of the 1-MW machine are revised and expanded based on experimental results obtained from a partially-manufactured prototype …
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Mechanical design of high frequency, high power density electric machine
… industry due to the advance of battery and power converter technologies. However, large-scale commercial aircraft electrification is hindered by the technology gap of electric machines. This thesis presented a high frequency, high power density (> 13 kW/kg), MW level electric motor design …
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Supercapacitor electrode materials based on nanostructured conducting polymers and metal oxides
… devices. Compared to batteries, they have higher power density, more excellent reversibility and longer cycle life. Therefore, supercapacitors have played an increasingly important role in the fields of power source especially in automotive applications, such as electric and hybrid electric …
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Spark Breakdown Voltage Sampling During Early Stage Compression
… These engines are well known for offering high specific power density solutions, however, this advantage cannot be fully exploited without new technologies enabling significantly reduced emissions and improved fuel economy. If this could be provided, working with direct fuel injection, new …
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High-frequency, slotless permanent magnet synchronous motor for aircraft propulsion
… development of next-generation, lightweight, power-dense motors. The benefit of lower weight in a motor is especially attractive when considered for aerospace applications, such as electric propulsion for aircraft. More specifically, significant reduction of weight and/or volume of the …
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New concepts in energy and mass transport within carbon nanotubes
… transistors, and phonon wave guides due to their high axial electrical and thermal conductivity. Also, their subnanometer scale with atomically smooth surfaces is promising for selective mass transport in nanoscale, such as molecular transport, selective gas permeation, and nanofluidics. The first …
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Synthesis and characterization of high-performance supercapacitor devices based on carbon/MnO2 composite and carbonized iron cations adsorbed onto polyaniline/nickel graphene foam
… published in recent years, inspired by their low specific energy and high production costs. Consequently, research focus in supercapacitors is on improving the specific energy (i.e. ~5˗8 Wh kg-1) without compromising its high specific power (i.e. ~5˗30 kW kg-1). In this work, the electrochemical …
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High-density multilevel power converters for use in renewable and transportation applications
… In each instance, the size and weight of the power electronics play a role in the overall system efficiency and installation cost. This dissertation demonstrates opportunities for increasing the power density and efficiency of inverter systems through the use of high-density capacitive energy …
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Design of electric vehicle propulsion system incorporating flywheel energy storage
… and performance. The limited driving range and high cost are significant impediments to the popularity of battery electric vehicles. The battery is the main element which affects the range and cost of the vehicle. The battery has to meet the requirements of sufficient power and energy, quick …
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Overcoming electro-thermal barriers to achieve extreme performance power conversion for more electric aircraft
… MEA concepts would still rely on a jet engine power plant to provide electrical power to these electric motors, NASA studies indicate these concepts can result in cleaner, quieter, and more fuel-efficient flight compared to current best-in-class passenger jet aircraft. To achieve this new …