Superposition techniques for analyzing cogging torque sensitivity to manufacturing errors in fractional pitch PMSM

Greg Heins, Mark Thiele

    Research output: Chapter in Book/Report/Conference proceedingConference Paper published in Proceedings

    Abstract

    Theoretically, the layout of fractional pitch permanent magnet motors should ensure the cancellation of most cogging torque harmonics. In reality, manufacturing errors lead to incomplete cancellation and higher than expected cogging torque. Two potential manufacturing errors are the variation in angle between successive magnets and the strength of the magnets. To determine the sensitivity of cogging torque to magnet strength and placement, a superposition technique is used. This technique is validated by first demonstrating that the total cogging torque can be reconstructed by summing offset versions of the torque from experimentally determined single-magnet/singleslot interactions. Following this validation, Monte Carlo simulations are conducted to statistically determine the sensitivity of cogging torque to magnet placement and strength errors. It is demonstrated that the mean RMS cogging torque increases by 4 % for every degree increase in magnet placement standard deviation and by 0.06% for every 1% increase in magnet strength standard deviation.
    Original languageEnglish
    Title of host publicationIECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society
    Place of PublicationNew York, USA
    PublisherIEEE, Institute of Electrical and Electronics Engineers
    Pages2042-2047
    Number of pages6
    ISBN (Print)978-1-61284-972-0
    DOIs
    Publication statusPublished - 2011
    EventAnnual Conference of the IEEE Industrial Electronics Society (IECON 2011 37th) - Melbourne, Australia, Melbourne, VIC, Australia
    Duration: 7 Nov 201110 Nov 2011
    Conference number: 2011 (37th)

    Conference

    ConferenceAnnual Conference of the IEEE Industrial Electronics Society (IECON 2011 37th)
    Abbreviated titleIECON
    CountryAustralia
    CityMelbourne, VIC
    Period7/11/1110/11/11

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  • Cite this

    Heins, G., & Thiele, M. (2011). Superposition techniques for analyzing cogging torque sensitivity to manufacturing errors in fractional pitch PMSM. In IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society (pp. 2042-2047). IEEE, Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/IECON.2011.6119622