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 19 of 19 for “"electric drives"”.
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Integration of Filter Elements in Electric Drives
Electric drives are becoming widely accepted and are found in hybrid electric vehicles and in higher-end home appliances. Traditional drive designs separate the power electronics and the electric machine, which reduces the potential for integration and the possibility of beneficial opportunities. …
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Optimization of superconducting magnetic bearings using finite element modeling
… superconducting bearings in large (3 - 100 MW) electric drives. Superconducting bearings are used to levitate the rotors inside electric drives via the Meiissner effect, whereby superconductors tend to repel magnetic flux. The Finite Element Method was used to model superconducting bearings and …
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Novel Methods of Thermal Management in High‐Performance Induction Motors Using Direct Stator Winding Cooling
… Consumers are encouraged to transition into electric vehicles as a clean alternative to fossil fuel consumption. However, the initial cost and reliability of current electric drives has negatively affected the market sales prompting the need for innovation. Therefore, this thesis investigates …
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Continuous Phase Synchronised Drives (for a rod-making machine)
… may be replaced by independently synchronised electric drives. Problems associated with utilising such electric drives for this form of machinery were investigated. The research concentrated on a high speed rod-making machine, which required control of high inertias (0.01-0.5kgm2), at …
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Transient analysis of six-phase synchronous machines
… and presently are being used in high power electric drives and in ac and/or dc power supplies. This thesis presents a mathematical model for investigating the transient performance of a six-phase synchronous machine, and develops a model for the simulation of such machines with the EMTP. The …
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Designing a Simple Indirect Vector Controlled Drive System in Simulink
… leaders. The emphasis has focused on hybrid/electric drive systems. In order to compete with current technology, these drives must be capable of operating under various load conditions as well as operating over a large speed range. Such performance requirements require motor control systems …
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The field oriented control of a permanent magnet synchrounous motor (PMSM) by using fuzzy logic
… To perform speed control of typical PMSM drives, PI controllers and FOC method are classically used. PI Controller controller suffers from the drawback that for its proper performance, the limits of the controller gains and the rate at which they would change have to be appropriately …
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Intelligent mobility control of a hybrid electric off-road vehicle with individual wheel control
… a theoretical, six-wheel drive, off-road Hybrid-Electric Vehicle based on an existing conventional six-wheel-drive Combat Support Vehicle developed by QinetiQ (formerly DERA). The proposed vehicle utilises Individual Wheel Control through the use of six, in-wheel, Hub Mounted Electric Drives. A …
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Cars on a diet : the material and energy impacts of passenger vehicle weight reduction in the U.S.
… more fuel-efficient powertrains, such as hybrid-electric drives. We can reduce weight by substituting some of the iron and steel used in vehicles with lighter-weight high-strength steel or aluminum, redesigning the vehicle, and/or downsizing the vehicle. Using these approaches, it is possible to …
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Modeling and control of interior permanent magnet synchronous machines at low switching-to-fundamental frequency ratios
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Analysis and design of a novel controller architecture and design methodology for speed control of switched reluctance motors
… cost, low performance switched reluctance motor drives. By utilizing inexpensive components in a simple, compact architecture, a low cost controller is developed which achieves a performance level similar to many high performance controllers. A speed control design methodology is established and …
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Investigation of Control Concepts for High-Speed Induction Machine Drives and Grid Side Pulse-Width Modulation Voltage Source Converters
… is usually applied for the control of high-speed drives especially in the case of very high-speed drives. Indirect rotor-flux-oriented control and direct torque control are designed and compared for the control of an exemplary high-speed induction machine drive. The 2L VSC is the most widely …
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Component-based mixed reality environment for the control and design of servo-pneumatic system
… development and availability of cost effective electric servo technologies, one reason is considered to be a lack of design and simulation tools for employing pneumatic servo drives. This research has therefore been conducted to address these concerns, and to demonstrate how appropriate tools …
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An average modeling approach of hybrid power systems for use in mobile refrigeration applications
… thesis presents averaging-based models of hybrid electric power systems for refrigeration units in delivery trucks. The background of the mobile refrigeration industry is stated, and the motivation of the proposed hybrid-powered ac motor drive is discussed. The model is intended to be used for an …
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Efficient operation of variable-pole induction machines and drives
… responsible for 82% of transportation emissions, electric vehicles (EVs) must become more affordable to replace conventional cars and reduce emissions. High power density, high efficiency, inexpensive drivetrains operating over a wide torque/speed range are critical for EVs. Most modern EVs use …
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A Novel Reconfigurable Induction Machine Drive for Hybrid Vehicles
… and depleting oil reserves, full and hybrid electric vehicles (EVs) are gaining significant attention from commercial bodies as well as government policymakers. Considering the high cost and range anxiety of full EVs, hybrid EVs are expected to be the immediate solution. The electric drive …
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Optimum Control for Minimization of Torque Ripple in Synchronous Reluctance Machines
… for identifying the sources of torque ripple in electric machines. It includes the effect of conductor distribution in the machine, magnet flux density distribution, current harmonics and non-idealities in position and current sensors. Harmonic orders and magnitudes of torque ripple developed due …
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Condition Monitoring of VSD-fed Induction Motors
Induction motor drives are presently the most fully fledged technology amidst the various motor drives not utilising commutators [1]. They consist of an induction motor (IM) fed from a variable frequency AC inverter. They are mostly used in applications which need good dynamic and steady state …
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A Synchronous Distributed Digital Control Architecture for High Power Converters
… consisting of concepts from several areas of electrical engineering. A review of the state of the art is presented in Chapter 2 in the areas of power electronics, fieldbus control networks, and digital design. A universal controller is proposed as a solution to the hardware independent control …