Short-circuit faults in high-speed PM machines with parallel strands and coils

M. van der Geest, H. Polinder, J.A. Ferreira

    Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

    Abstract

    Electrical machines for safety critical applications need to be able to withstand all possible short-circuits, including those between individual turns. In high-speed machines multiple parallel strands may be used to reduce AC losses in the winding, increasing the likelihood of a turn-level short-circuit. This paper considers the consequences of using parallel strands on the short-circuit losses. Additionally, the effect of using a PWM voltage supply is also considered. It is found that using multiple parallel strands reduces the local losses that occur during a short-circuit, but at the same time slightly increases the total losses. Also, local fault currents can be reduced better with a remedial terminal short-circuit when using parallel strands, suggesting a small safety benefit. The effect of supply voltage harmonics on the maximum short-circuit losses is found to be negligible.
    Original languageEnglish
    Title of host publicationProceedings - 7th IET International Conference on Power Electronics, Machines and Drives
    EditorsA. Forsyth
    Place of PublicationStevenage, UK
    PublisherIET
    Pages1-6
    Number of pages6
    ISBN (Print)978-1-84919-815-8
    DOIs
    Publication statusPublished - 2014
    EventIET PEMD 2014: 7th IET International Conference on Power Electronics, Machines and Drives - Manchester, United Kingdom
    Duration: 8 Apr 201410 Apr 2014

    Publication series

    Name
    PublisherIET

    Conference

    ConferenceIET PEMD 2014
    CountryUnited Kingdom
    City Manchester
    Period8/04/1410/04/14

    Keywords

    • fault-tolerant
    • permanent-magnet machine
    • shortcircuit

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