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Dynamic behaviour of pm traction machines during symmetrical short circuits
Eichin, F. 2025. Dynamic Behaviour of PM Traction Machines During Symmetrical Short Circuits. Unpublished doctoral dissertation. Stellenbosch: Stellenbosch University [online]. Available: https://scholar.sun.ac.za/items/63a690f8-1e46-4ca1-aad0-108a1d43eeb4
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Stellenbosch : Stellenbosch University
2025
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| _version_ | 1867613902666203136 |
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| access_status_str | Open Access |
| author | Eichin, Fabian |
| author2 | Wang, R. J. |
| author_browse | Eichin, Fabian Wang, R. J. |
| author_facet | Wang, R. J. Eichin, Fabian |
| author_sort | Eichin, Fabian |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Eichin, F. 2025. Dynamic Behaviour of PM Traction Machines During Symmetrical Short Circuits. Unpublished doctoral dissertation. Stellenbosch: Stellenbosch University [online]. Available: https://scholar.sun.ac.za/items/63a690f8-1e46-4ca1-aad0-108a1d43eeb4 |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/132199 |
| institution | Stellenbosch University (South Africa) |
| last_indexed | 2026-06-10T12:43:31.605Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/132199 Dynamic behaviour of pm traction machines during symmetrical short circuits Eichin, Fabian Wang, R. J. Kamper, M. J. Gerber, S. Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. Electric motors, Synchronous Fault tolerance (Engineering) Short circuits -- Testing -- Standards UCTD Eichin, F. 2025. Dynamic Behaviour of PM Traction Machines During Symmetrical Short Circuits. Unpublished doctoral dissertation. Stellenbosch: Stellenbosch University [online]. Available: https://scholar.sun.ac.za/items/63a690f8-1e46-4ca1-aad0-108a1d43eeb4 Thesis (PhD)--Stellenbosch University, 2025. ENGLISH ABSTRACT: This thesis studies the dynamic behaviour of modern permanent magnet (PM) traction machines during short circuits. In traction and aerospace applications, the symmetrical short circuit is of significant importance as an active safety mode that the machine must be capable of withstanding. Traditionally, the analysis of such highly dynamic events has relied on extensive transient finite element analysis (FEA), though this method is computationally expensive. In contrast, analytical and semi-analytical techniques offer a more efficient means of assessment, which can be readily incorporated into design loops and optimization workflows. Modern traction machines are characterized by high power density, often achieved through the integration of rare-earth PMs, which, however, introduce the risk of demagnetization during fault conditions. A key focus of this work is the dynamic current computation, which directly impacts the counteracting field that can jeopardize the PM’s remnant magnetization. Models that account for machine non-linear behaviour have been shown to yield the most accurate current predictions. Machine saturation is represented through flux linkage look-up tables, which are derived from magnetostatic FEA and can be integrated into transient simulations. The accuracy of these models is sensitive not only to saturation but also to spatial harmonics, and capturing the combination of both typically necessitates extended computation times. When compared to experimental measurements, models that incorporate non-linear behaviour achieve high accuracy, while linear approximations have led to errors of more than 20%. Beyond the mentioned effects, eddy currents can contribute to additional increments in dynamic peak current and distort the PM field solution. This phenomenon has been thoroughly researched in this study, leading to the development of a simplified model to represent the induced PM reaction field. Nevertheless, findings indicate that the effect remains negligible in smaller-scale machines and those with segmented PMs, a configuration commonly observed in traction applications. Finally, a case and parameter study was carried out, identifying topologies and machine design features that enhance fault tolerance. A gradient-based optimization framework was developed, incorporating the methodologies presented herein, enabling the inclusion of short-circuit events and facilitating the identification of fault-robust designs. The framework allowed to improve a benchmark design in terms of cost efficiency and fault robustness while providing important general insights on fault robustness. AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar. Doctoral 2025-05-29T11:06:33Z 2025-05-29T11:06:33Z 2025-03 Thesis https://scholar.sun.ac.za/handle/10019.1/132199 Stellenbosch University xvi, 126 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Electric motors, Synchronous Fault tolerance (Engineering) Short circuits -- Testing -- Standards UCTD Eichin, Fabian Dynamic behaviour of pm traction machines during symmetrical short circuits |
| title | Dynamic behaviour of pm traction machines during symmetrical short circuits |
| title_full | Dynamic behaviour of pm traction machines during symmetrical short circuits |
| title_fullStr | Dynamic behaviour of pm traction machines during symmetrical short circuits |
| title_full_unstemmed | Dynamic behaviour of pm traction machines during symmetrical short circuits |
| title_short | Dynamic behaviour of pm traction machines during symmetrical short circuits |
| title_sort | dynamic behaviour of pm traction machines during symmetrical short circuits |
| topic | Electric motors, Synchronous Fault tolerance (Engineering) Short circuits -- Testing -- Standards UCTD |
| url | https://scholar.sun.ac.za/handle/10019.1/132199 |
| work_keys_str_mv | AT eichinfabian dynamicbehaviourofpmtractionmachinesduringsymmetricalshortcircuits |