Institutional Repository
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/AC7554F0-F0ED-451A-A929-A59006F9E100 | ||
| Year | 2025 | ||
| Type of Item | Diploma Work | ||
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| Bibliographic Citation | Christos-Emmanouil Apanomeritakis, "Stator inter-turn fault diagnosis in direct-online starting permanent magnet motors", Diploma Work, School of Electrical and Computer Engineering, Technical University of Crete, Chania, Greece, 2025 https://doi.org/10.26233/heallink.tuc.103333 | ||
| Appears in Collections |
In this thesis, an electromagnetic analysis was carried out using the finite element method on a line-start permanent magnet synchronous motor (LSPMSM) operating under an internal short-circuit fault in the stator windings. The motor had a power rating of 750 watts and in all simulated cases, it operated under nominal load.Initially, a historical overview of the discovery of electric machines is presented, followed by a classification and analysis of the characteristics of permanent magnet motors. Then, the faults that can occur in permanent magnet synchronous motors are discussed, and since this study focuses on internal short circuits, a chapter is dedicated to the analysis of their diagnostic methods. Subsequently, the design process of the motor geometry within the SimCenter Magnet environment is presented, along with the model of the modified stator that induces an internal short circuit between the windings of two coils of the same phase. The simulation results of each fault scenario are imported into MATLAB and analyzed comparatively against those of healthy operation, in order to draw conclusions.For fault diagnosis, harmonic analysis of the stator current was performed using the MCSA, EPVA, and Negative Sequence Current methods, as well as spectral analysis of the motor’s electromagnetic torque. Finally, the stray flux monitoring method was employed, which is based on tracking the magnetic flux outside the motor using sensors and analyzing the frequency spectrum of their signals.
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