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Doctoral Thesis
Author of thesis: Ing. et Ing. Lukáš Zezula
Acad. year: 2025/2026
Supervisor: doc. Ing. Petr Blaha, Ph.D.
Reviewers: doc. Ing. Martin Kuchař, Ph.D., prof. Ing. Zdeněk Peroutka, Ph.D.
This doctoral thesis addresses the modeling and the diagnostics of interturn short circuits in synchronous motors with permanent magnets. Continuous-time and discrete-time models of a shorted motor are presented, capturing not only the impact of the fault itself but also additional effects such as radial fluxes from permanent magnets, series–parallel connections of stator phase segments, and motor connection resistance. The proposed discrete-time model achieves a trade-off between prediction accuracy and computational demands, with experimental validation confirming its superior precision compared to the forward Euler approximation. The model then forms the basis for the diagnostic algorithm, combining parameter estimation, statistical approach for model comparison, and Kalman filtering with Bayesian decision-making to enable fault detection, interturn short circuit localization, and subsequent identification of fault severity and hidden state monitoring. Laboratory experiments demonstrate that all parts of the diagnostic algorithm are fully functional, even at extremely low fault severities and in transient states.
discrete-time systems, fault currents, fault detection, fault diagnosis, fault location, Kalman filters, mathematical model, model checking, parameter estimation, permanent magnet machines, permanent magnet motors, recursive estimation, short-circuit currents, state estimation
Date of defence
10.12.2025
Result of the defence
Defended (thesis was successfully defended)
Process of defence
Disertant seznámil komisi s podstatnými částmi své disertační práce a úspěšně zodpověděl připomínky a otázky oponentů a členků komise.
Language of thesis
English
Faculty
Fakulta elektrotechniky a komunikačních technologií
Department
Department of Control and Instrumentation
Study programme
Cybernetics, Control and Measurements (DPC-KAM)
Composition of Committee
doc. Ing. Petr Beneš, Ph.D. (předseda) prof. Ing. Zdeněk Peroutka, Ph.D. (člen) doc. Ing. Martin Kuchař, Ph.D. (člen) prof. Ing. Jiří Lettl, CSc. (člen) doc. Ing. Bohumil Klíma, Ph.D. (člen)
Supervisor’s reportdoc. Ing. Petr Blaha, Ph.D.
Reviewer’s reportdoc. Ing. Martin Kuchař, Ph.D.
Reviewer’s reportprof. Ing. Zdeněk Peroutka, Ph.D.
Responsibility: Mgr. et Mgr. Hana Odstrčilová