Vector controlled elevator drive

Güleç, Mustafa Alpertunga
In this thesis, a practical vector controlled elevator drive is presented. Indirect vector control of induction machine is investigated in theory and then implemented. Control technique is compared with scalar control and induction machine is compared with dc motor. The operation of the system depends on induction machine parameters, so how to accurately and automatically obtaining of the parameters is also presented. Finally, the elevator system is introduced, the application of this control system to the elevator system is described and a basic elevator control system is simulated.


Design and implementation of an ultracapacitor test
Eroğlu, Hasan Hüseyin; Hava, Ahmet Masum; Department of Electrical and Electronics Engineering (2010)
In this thesis, a test system is designed and implemented in order to evaluate the basic electrical performance and determine the parameters of ultracapacitors (UC). The implemented UC test system is based on power electronics converters and it is capable of charging and discharging the UC under test with predetermined current profiles. The charging operation is provided by a configuration involving the AC utility grid, a step-down transformer, a diode bridge, and a DC bus filter capacitor followed by a ste...
Application of a natural-resonance based feature extraction technique to small-scale aircraft wires for electromagnetic target classification
Ersoy, Mehmet Okan; Sayan, Gönül; Department of Electrical and Electronics Engineering (2004)
The problem studied in this thesis, is the classification of the small-scale aircraft targets by using a natural resonance based electromagnetic feature extraction technique. The aircraft targets are modeled by perfectly conducting, thin wire structures. The electromagnetic back-scattered data used in the classification process, are numerically generated for five aircraft models. A contemporary signal processing tool, the Wigner-Ville distribution is employed in this study in addition to using the principal...
Beforehand obtaining a safety operation condition by using daily load curves in transient stability and graphical software for transient stability applications
Öztop, Celal; Ertaş, Arif; Department of Electrical and Electronics Engineering (2005)
In this thesis, relationship between two most important transient stability indices, critical clearing time and generator rotor angle is examined for one machine-infinite bus system and then extended to the multimachine case and is observed to be linear. By using the linear relationship between critical clearing time and generator rotor angle and utilizing the daily load curve, a new preventive method is proposed. The aim of this method is to make all critical clearing times longer than the relay and circui...
Recognition of human face expressions
Ener, Emrah; Severcan, Mete; Department of Electrical and Electronics Engineering (2006)
In this study a fully automatic and scale invariant feature extractor which does not require manual initialization or special equipment is proposed. Face location and size is extracted using skin segmentation and ellipse fitting. Extracted face region is scaled to a predefined size, later upper and lower facial templates are used for feature extraction. Template localization and template parameter calculations are carried out using Principal Component Analysis. Changes in facial feature coordinates between ...
A single transistor unity power factor rectifier
Tunç, Murat; Ertan, Hulusi Bülent; Department of Electrical and Electronics Engineering (2007)
This thesis analyzes unity power factor rectifiers since this type of rectifiers use energy as efficient as possible. Throughout the thesis, some unity power factor rectifier topologies are investigated and some of them selected to investigate in detail. Afterwards, a new single transistor unity power factor rectifier topology is proposed, simulated, implemented and compared with one of the selected unity power factor rectifier topology on the basis of efficiency, total harmonic distortion, input current ri...
Citation Formats
M. A. Güleç, “Vector controlled elevator drive,” M.S. - Master of Science, Middle East Technical University, 2006.