Scaling laws for direct drive generators in wind turbines

G Shrestha, H Polinder, JA Ferreira

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

    26 Citations (Scopus)


    Abstract Upscaling of wind turbines affects the individual components in the wind turbine. In order to assess the effects of upscaling on the direct drive generator used in wind turbines, the weight and size of the generator sub-components should be estimated. A method to estimate the weight is either by designing the generator analytically, or by using finite element method or by building the machine. These methods can be time consuming and complicated. The objective of this paper is to find the scaling laws for the weight of both electromagnetic and structural material used in direct drive generator specifically for wind turbine application. The scaling laws can be used to quickly estimate the weight of direct drive machine of any required size. The scaling laws for electromagnetic material and structural material are derived for various power levels and aspect ratios. Then the reference turbine Zephyros (now Harakosan) Z72 is used to find the generator weight of up to 20 MW machine and different aspect ratio.
    Original languageUndefined/Unknown
    Title of host publicationProceedings IEEE International Electric Machines and Drives Conference, 2009. IEMDC '09
    Editors s.n.
    Place of PublicationPiscataway
    PublisherIEEE Society
    Number of pages7
    ISBN (Print)978-1-4244-4252-2
    Publication statusPublished - 2009
    EventIEEE International Electric Machines and Drives Conference, 2009. IEMDC '09, Miami - Piscataway
    Duration: 3 May 20096 May 2009

    Publication series



    ConferenceIEEE International Electric Machines and Drives Conference, 2009. IEMDC '09, Miami


    • conference contrib. refereed
    • Conf.proc. > 3 pag

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