Influences of Stator Conductor Spatial Positions on Transient Potential Distributions in Electric Machines fed from Wide-Bandgap Inverters

Zusammenfassung

This thesis presents a novel method to addressing the challenges arising from steep-fronted voltage impulses on the dielectric strength of insulation systems in stator windings, with a focus on the spatial arrangement of conductors in the stator slots. The motivation for this research stems from the increasing prevalence of voltage impulses with high gradients, which can lead to more pronounced inter-turn voltage stress, particularly in the line-end coils of electric machines. Studies have shown that under repetitive voltage impulses, the turn-to-turn insulation is subjected to greater stress than the ground insulation, leading to potential insulation breakdowns. Consequently, this research focuses on understanding the high-frequency behavior of voltage impulses in the stator winding and the influence of conductor positioning. The study begins with an analysis of different pulse voltage stresses using an inverter based on silicon carbide power semiconductors and investigates the impacts of different insulated wires on the partial discharge inception voltage. To explore these transient phenomena further, high-frequency models representing stator windings are developed, beginning with a single-coil structure and subsequently extending to a three-phase winding model. Each step is validated through experimental measurements.

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Copyrightjahr: 2025
ISBN-Online: 978-3-69030-053-7
Verlag: TEWISS, Garbsen
Reihe: Berichte aus dem IAL
Band: 02/2025 E-Book
Sprache: Deutsch
Seiten: 186
Produkttyp: Monographie

Inhaltsverzeichnis

KapitelSeiten

1. Kurzfassung Kein Zugriff
2. Abstract Kein Zugriff
3. Contents Kein Zugriff
4. Abbreviations Kein Zugriff
5. Nomenclature Kein Zugriff
1. 1.1 Preview of Past Works Kein Zugriff
2. 1.2 Research Questions Kein Zugriff
3. 1.3 Outline Kein Zugriff
1. 2.1 Basic Stator Winding Structures Kein Zugriff
2. 2.2 Insulation Systems Kein Zugriff
3. 2.3 Summary Kein Zugriff
1. 3.1 Basics of Partial Discharges Kein Zugriff
2. 3.2 Partial Discharges Detection System Kein Zugriff
3. 3.3 Experimental Validations Kein Zugriff
4. 3.4 Specimens and Partial Discharge Measurement Setups Kein Zugriff
5. 3.5 Partial Discharge Measurement Results Kein Zugriff
6. 3.6 Discussion Kein Zugriff
1. 4.1 Mathematical Approaches Kein Zugriff
2. 4.2 Calculation of Winding Parameters Kein Zugriff
3. 4.3 Calculation Process Kein Zugriff
4. 4.4 Experimental Validations and Comparisons Kein Zugriff
5. 4.5 Discussion Kein Zugriff
1. 5.1 Single-Phase Model Kein Zugriff
2. 5.2 Genetic Algorithms Kein Zugriff
3. 5.3 Specimens Kein Zugriff
4. 5.4 Optimization Results Kein Zugriff
5. 5.5 Discussion Kein Zugriff
1. 6.1 Three-Phase Model Kein Zugriff
2. 6.2 Experimental Validations Kein Zugriff
3. 6.3 Optimization Results Validations Kein Zugriff
4. 6.4 Discussion Kein Zugriff
7 Conclusions and Outlooks Kein Zugriff Seiten 164 - 166
1. A.1 Validation Measurements with the SiC-based Inverter Kein Zugriff
2. A.2 Validation Measurements with the Commercial Surge Tester Kein Zugriff
3. A.3 PD Measurements with the SiC-based Inverter Kein Zugriff
4. B Three-Phase HF Model with Qcg = 2 and Qc = 6 Kein Zugriff
5. C Three-Phase HF Model with Optimization Results Kein Zugriff
Bibliography Kein Zugriff Seiten 177 - 183
Curriculum Vitae Kein Zugriff Seiten 184 - 186