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 11 of 11 for “"Variable Frequency Drive"”.
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Modeling of industrial power distribution circuits for voltage sag and fault analysis
… It then investigates and develops a 24-pulse variable frequency drive (VFD) model in EMTP. The functionality of the VFD model is evaluated by using a test feeder, with a focus on its control mechanisms. The VFD is controlled with the field-oriented control (FOC) method and tuning procedures …
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Harmonic Analysis of a Static VAR Compensated Mixed Load System
… widely used power electronic based load is the Variable Frequency Drive (VFDs) used to vary the speed of an induction motor; whereas a common example of a power electronic based controller used in power systems is the Static VAR Compensator (SVC) for improving a system’s power factor. In this …
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Insulation considerations and qualifications for form-wound air-core armature windings in high-frequency electrical machines
… the machine's electrical loading and operating frequency, which often increases the machine's operating temperature and requires a strong insulation scheme. This thesis will explore the insulation scheme implemented in a high specific power permanent magnet synchronous machine currently being …
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Single Degree of Freedom Solid Rotor Velocity Control Induction Drive
… (PI) controller applying a constant amplitude, variable frequency drive. The stator consists of six iron teeth, evenly spaced and pointing radially inward, wound with 160 turns of copper wire each in a three-phase, two-pole configuration. A steel enclosure houses the stator and is supported by a …
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Design and Fabrication of an Electric-Field Induction Motor
… to predict the average torque of the motor when driven with an ideal sinusoidal potential wave. Using this model, a motor is designed with volume and power comparable to a mesoscale dielectric elastomer actuator, a state-of-the-art technology for micro-actuators. Harmonic decomposition is applied …
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A Method for Evaluating the Application of Variable Frequency Drives with Coal Mine Ventilation Fans
… band of air pressures and quantities. The use of variable frequency drives (VFDs), which control fan speed, provides a solution to this problem. VFDs are already used in various similar applications such as pumping and building ventilation. New technology now enables efficient VFD operation in …
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Design and Comparison of Induction Motor and Synchronous Reluctance Motor for Variable Speed Applications: Design Aided by Differential Evolution and Finite Element Analysis
… in order to design a 55Kw Induction Motor for variable speed applications, posteriorly, the performance of the final design was optimized by means of Finite Element Method (FEM) and evaluated through Indirect Field Oriented Current Control (IFOCC) strategy. Likewise, an equivalent Synchronous …
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Modeling brake specific fuel consumption to support exploration of doubly fed electric machines in naval engineering applications
… The fuel consumption of prime movers is a multi-variable function of power demand and rotational speed. Mechanically coupled power and propulsion arrangements constrain this two degree of freedom relationship by removing the independence of the speed parameter. Fixed frequency power generation …
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Development of Measurement Methods for Application to a Wind Tunnel Test of an Advanced Transport Model
… for validation. The subsonic wind tunnel’s variable frequency drive generated noise which could not be filtered or shielded, requiring the use of a flow bench for validation testing. Since velocity measurements could not be made in the flow bench, a comparison of a fast and slow velocity was …
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The design and optimization of a system using an induction motor driven pump, powered by solar panels
… the design and evaluation of an induction motor driven water pumping system which is powered by solar panels. The system consists of a positive displacement pump, solar panels and an induction motor with a microprocessor controlled inverter. The reason that an induction motor has been chosen for …
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Developing a system to measure rheology of conditioned soil for soft-ground TBM tunneling
Driven by the unprecedented process of urbanization across the globe and rise of need in infrastructure such as transportation, water, sewer, utilities, storage space, etc., the world has witnessed rapid expansion of the tunneling and underground construction industry in the past few decades. Among …