Browsing by Author "Toliyat, Hamid A."
Now showing items 1-20 of 36
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Talebi Rafsanjan, Salman (2009-05-15)Power systems on modern commercial transportation systems are moving to more electric based equipment, thus improving the reliability of the overall system. Electrical equipment on such systems will include some loads that ...
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Analysis and design of matrix converters for adjustable speed drives and distributed power sources Cha, Han Ju (Texas A&M University, 2004-11-15)Recently, matrix converter has received considerable interest as a viable alternative to the conventional back-to-back PWM (Pulse Width Modulation) converter in the ac/ac conversion. This direct ac/ac converter provides ...
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Han, Xu (2012-02-14)Induction motors and Variable Frequency Drives (VFDs) are widely used in industry to drive machinery trains. However, some mechanical trains driven by VFD-motor systems have encountered torsional vibration problems. This ...
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Frank, Nicolas Walter (2012-07-16)In the field of electric machine design, a trend in many applications has been to design machines with increasing torque density. When machines fail to meet torque density requirements or are simply incapable of matching ...
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Balakrishnan, Divya Rathna (2012-02-14)Reactive power, denoted as volt-ampere reactive (VARs), is fundamental to ac power systems and is due to the complex impedance of the loads and transmission lines. It has several undesirable consequences which include ...
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Kaya, Mine (2020-11-19)High energy needs and environmental concerns associated with fossil fuels have raised the demand for efficient and clean alternatives of power generation. Solar cell technology is one of the most promising options of ...
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Toliyat, Hamid A.; Amirabadi, Mahshid (United States. Patent and Trademark Office; Texas A&M University. Libraries, 2015-03-24)Three resonance-based universal power converter topologies are disclosed. One includes a partially resonant parallel L-C link and incorporates intermediate cross-over switching circuits between the link stage and each of ...
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Khopkar, Rahul Vijaykumar (Texas A&M University, 2004-11-15)The aim of this work is to reduce the cost and size of a brushless dc motor (BLDC) drive as well as increase the reliability and ruggedness of that drive. Traditional BLDC drives use Voltage Source Inverters (VSI) that ...
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An, Gihyeob (2017-08-07)In this paper, we propose a lane changing model based on the collision cone approach. Specifically, we show how a vehicle decides whether to change lanes using the collision cone algorithm based on the velocity and the ...
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Hu, Tiejun (Texas A&M University, 2005-08-29)This dissertation presents a high-precision positioner with a novel superimposed concentrated-field permanent-magnet matrix. This extended-range multi-axis positioner can generate all 6-DOF (degree-of-freedom) motions with ...
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Sadighi, Ali (2010-10-12)This dissertation presents the development of a novel linear magnetostrictive actuator. The magnetostrictive material used here is Terfenol-D, an alloy of the formula Tb0.3Dy0.7Fe1.92. In response to a traveling magnetic ...
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Ozturk, Salih Baris (2009-05-15)This work presents the direct torque control (DTC) techniques, implemented in four- and six-switch inverter, for brushless dc (BLDC) motors with non-sinusoidal back- EMF using two and three-phase conduction modes. First ...
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Keyhani, Hamidreza (2014-01-08)Recently, the demand for high-power-density converters with high efficiency and enhanced reliability has increased considerably. To address this demand, this dissertation introduces several low, medium, and high power ...
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Muhammad Abdullah, Reza (2012-07-16)Biopotential signals are important to physicians for diagnosing medical conditions in patients. Traditionally, biopotentials are acquired using contact electrodes together with instrumentation amplifiers (INAs). The ...
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Ozkentli, Esra (2012-10-19)Variable frequency drives (VFD) and subsea (umbilical) cables are frequently used in electrical submersible pump (ESP) systems for offshore platforms. There are two basic system configurations for ESP systems; VFD can be ...
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Al-Ghasem, Adnan Mahmoud (Texas A&M University, 2005-08-29)This thesis presents the dynamic and static forced performance of a flexure-pivot tilting-pad bearing load between pad (LBP) configuration for different rotor speeds and bearing unit loadings. The bearing has the following ...
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Toliyat, Hamid A.; Johnson, Matthew C.; Gardner, Matthew C. (United States. Patent and Trademark Office; Texas A&M University. Libraries, 2019-11-12)An axial flux magnetic geared machine includes a high speed magnetic rotor and a low speed magnetic rotor maintained in a spaced relationship from the high speed magnetic rotor. A modulating structure is disposed between ...
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Toliyat, Hamid A.; Torshizi, Seyed Morteza Moosavi (United States. Patent and Trademark Office; Texas A&M University. Libraries, 2021-05-04)A power converter includes a multiple-winding transformer. The multiple-winding transformer provides an electromagnetic link between an input side and an output side of the power converter. An inductor is arranged on at ...
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Toliyat, Hamid A.; Gardner, Matthew C.; Talebi, Dorsa (United States. Patent and Trademark Office; Texas A&M University. Libraries, 10/18/2022)An electric machine includes a stator having a stator winding disposed thereon. A rotor is electromagnetically exposed to the stator. A field winding and an induction winding are disposed on the rotor. A rectifier is ...
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Negahdari, Amir (2017-07-31)Salient pole synchronous generators as the main component of an electricity generation station should be carefully maintained and their operation has to be monitored such that any damage on them is avoided. Otherwise, the ...