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akron1116121267.pdf (3.07 MB)
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Abstract Header
Torque Ripple Minimization in Direct Torque Control of Induction Machines
Author Info
Abdalla, Abdelnassir
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=akron1116121267
Abstract Details
Year and Degree
2005, Master of Science, University of Akron, Electrical Engineering.
Abstract
Direct torque control (DTC) of an induction motor fed by a voltage source inverter is a simple scheme that does not need long computation time, can be implanted without mechanical speed sensors and is insensitive to parameter variations. In principle, the motor terminal voltages and currents are sampled and used to estimate the motor flux and torque. Based on estimates of the flux position and the instantaneous errors in torque and stator flux magnitude, a voltage vector is selected to restrict the torque and the flux errors within their respective torque and flux hysteresis bands. In the conventional DTC, the selected voltage vector is applied for the whole switching period regardless of the magnitude of the torque error. This can result in high torque ripple. A better drive performance can be achieved by varying the duty ratio of the selected voltage vector during each switching period according to the magnitude of the torque error and position of the stator flux. A duty ratio control scheme for an inverter-fed induction machine using DTC method is presented in this thesis. The use of the duty ratio control resulted in improved steady state torque response, with less torque ripple than the conventional DTC. Fuzzy logic control was used to implement the duty ratio controller. The effectiveness of the duty ratio method was verified by simulation using SIMULINK, and experimentally using TMS320F240 DSP Evaluation Board.
Committee
Malik Elbuluk (Advisor)
Pages
110 p.
Keywords
power electronics
;
motor drives
;
induction machines
;
direct torque control
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Citations
Abdalla, A. (2005).
Torque Ripple Minimization in Direct Torque Control of Induction Machines
[Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1116121267
APA Style (7th edition)
Abdalla, Abdelnassir.
Torque Ripple Minimization in Direct Torque Control of Induction Machines.
2005. University of Akron, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=akron1116121267.
MLA Style (8th edition)
Abdalla, Abdelnassir. "Torque Ripple Minimization in Direct Torque Control of Induction Machines." Master's thesis, University of Akron, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1116121267
Chicago Manual of Style (17th edition)
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Document number:
akron1116121267
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5,596
Copyright Info
© 2005, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.