Institutional Repository
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/91F15340-E9DC-46AE-97D0-9D3D32541471 | ||
| Year | 2025 | ||
| Type of Item | Diploma Work | ||
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| Bibliographic Citation | Natalia Fatsea, "Electromagnetic analysis of a Line-Start permanent magnet synchronous motor with demagnetization and broken bar faults", Diploma Work, School of Electrical and Computer Engineering, Technical University of Crete, Chania, Greece, 2025 https://doi.org/10.26233/heallink.tuc.104916 | ||
| Appears in Collections |
The Line-Start Permanent Magnet Synchronous Motor (LSPMSM) is increasingly adopted in industrial applications because of its high efficiency, high power density, robustness, and ability to start directly from the grid. Its performance can be significantly affected by faults such as demagnetization of the permanent magnets and broken rotor bars of the squirrel cage. However, little research has been made for the LSPMSM bearing those faults. This thesis presents a comprehensive electromagnetic analysis of a 750W LSPMSM under healthy and faulty operating conditions, with a focus on quantifying the impact of demagnetization and broken bar defects.A two-dimensional FEM model was developed to simulate the motor’s steady-state and transient performance under nominal load, using the Finite Element Analysis (FEA) software Simcenter MAGNET. The model was then validated against the experimental results for the healthy motor and subsequently modified to introduce uniform demagnetization and broken bar scenarios. The methods used to analyze motor behavior were Motor Current Signature Analysis (MCSA), stray flux monitoring, and Short-time Fourier Transform (STFT), all of which are based on obtaining the frequency content of the signals through the Fast Fourier Transform (FFT).The findings highlight that stray flux monitoring is successful for demagnetization detection, providing a basis for early detection and condition monitoring. In contrast, broken bar faults exhibit less distinctive signatures, indicating the need for further study.
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