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 42 for “"synchronous machines"”.
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Transient analysis of six-phase synchronous machines
Six-phase synchronous machines have been used in the past for high power generation, 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 …
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Torque estimation in permanent magnet synchronous machines
El uso de máquinas síncronas de imanes permanentes ha aumentado notablemente en aplicaciones industriales y de tracción eléctrica durante las últimas décadas, debido a su mejor comportamiento sobre otros tipos de motores eléctricos en aspectos clave como son la densidad de potencia, densidad de …
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Synchronized Rotor Angle Measurement of Synchronous Machines
A key input parameter to governor feedback control and stability protection of generators is the angle of the induced voltage internal to the generator. Current practice is to estimate this value using measurements from the terminals of the generator and mathematical models. This project aims to …
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Computer-aided design of high speed synchronous machines.
Thesis. 1978. M.S.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Modeling, design, and optimization of permanent magnet synchronous machines
… algorithms, mechanical structures, and electric machines. Running, legged robots have presented challenges in the area of electric machinery in particular. In addition to the low-speed, high-torque, low-mass requirements on the machines, the act of running results in an unconventional drive cycle …
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The Loss in Solid Poles of Synchronous Machines On Load
The loss in solid poles of synchronous machines on load may be caused by several travelling waves and the thesis is directed towards a discussion of the problems arising from the superposition of these waves and of the effect of the superposed main field, which is stationary relative to the poles. …
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Investigation of the causes of negative damping of synchronous machines
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1947.
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Modeling and Design of Wound-Field Synchronous Machines for Transportation Applications
L'abstract è presente nell'allegato / the abstract is in the attachment
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Design framework for magnet loss reduction in permanent magnet synchronous machines
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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THEORETICAL AND EXPERIMENTAL INVESTIGATIONS OF THE CROSSMAGNETIZING PHENOMENON IN SATURATED SYNCHRONOUS MACHINES
In recent studies of the saturation effect in synchronous machines, there has been an increasing recognization of the important role of the magnetic coupling between the direct- and quadrature-axis (the cross-magnetizing phenomenon) in the analysis of saturated synchronous machines. In this …
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Comparison of interior permanent magnet synchronous machines for a high-speed application
Permanent Magnet machines have been increasingly used in high-speed applications due to the advantages they offer such as higher efficiency, output torque and, output power. This dissertation discusses the electrical and magnetic design of permanent magnet machines and the design and analysis of …
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A Dynamic Magnetic Equivalent Circuit Model For Design And Control Of Wound Rotor Synchronous Machines
… automated multi-objective design of wound-rotor synchronous machines (WRSMs). In this research, the MEC model and its application have been enhanced. Initial enhancement has focused on using the MEC model to explore machine design and control as a unified problem. Excitation strategies for …
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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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Electromagnetic modeling and variable-speed-operation characteristics of inverter-driven, high-frequency, low-inductance permanent magnet synchronous machines
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Impact of high penetration of PV generation on power system transient stability and fault current; modeling for real-time studies
… shift has raised major challenges of replacing synchronous machines and their well-known dynamics with power-electronics interfaced generation whose behavior and response when integrated to the bulk power system is yet to be fully understood. Over the years, many researchers investigated the …
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Performance studies of HEFSM with 6 slot- 7 pole for HEV application
Hybrid excitation machines (HEMs) that consist of permanent magnet (PM) and field excitation coil (FEC) as their main flux sources has several attractive features compared to interior permanent magnet synchronous machines (IPMSM) conventionally employed in hybrid electric vehicles (HEVs). Hybrid …
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Medium voltage petrochemical drives : soft start and adjustable speed systems
Medium voltage synchronous machines are used for large petrochemical compressor motor drives (>13 MW) at high application voltages (e.g. +-11 kV). Limited research exists on the application of Voltage Source Inverters (VSIs) for these petrochemical loads. An application concept is described where …
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Efficiency Improvement Strategies and Control of Permanent Magnet Motor Drives
Permanent magnet brushless dc (PMBDC) and synchronous machines (PMSM) drives are favored in variable speed applications for their high efficiency operation. Energy efficiency improvement in such motor drives is of interest in recent times because of rising cost of energy. Accordingly, two current …
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Multi-Time-Scale Modeling and Aggregation of Higher Order Synchronous Machine Models (Power Systems, Reduced, Singular Perturbation)
… with the reduced order modeling of electric machines and interconnected power systems using singular perturbation and multi-time-scale techniques. First, a sound mathematical framework for the various reduced order models of synchronous machines found in the literature is obtained and several …
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Design study of the proposed 12slot-14pole field excitation flux switching machine (FEFSM) for hybrid electric vehicles
… target compared to Interior Permenant Magnet Synchronous Machines (IPMSM) that used in HEV drives. “The results obtained show that proposed 12S-14P FEFSM achieved the target performance for maximum power, maximum torque density, maximum power density and machine weight, while the maximum …
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