Electromechanical dynamics analysis of pole-piece rotors in pseudo direct-drive wind turbine generators

Michiel Desmedt, Jianning Dong, Faisal Wani, Pavol Bauer, Henk Polinder

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

2 Citations (Scopus)
63 Downloads (Pure)


This paper analyses the electromechanical dynamics of the pole-piece rotors in a pseudo direct-drive wind turbine generator. The investigated generator has a rated power of 10 MW and was designed in the INNWIND.EU project. One way coupled finite element analysis (FEA) was used to calculate the rotor dynamic defections caused by electromagnetic forces in the air gap. Results show that the deflection exceeds the air gap length which is not mechanically feasible. To solve the problem, three structural modifications are proposed and tested in FEA to reduce the pole piece deflection significantly. The results of the three solutions are compared to idenfity the most promising one. It shows that a ribbed rotor piece topology is the most suitable option because it achieves a reasonable tradeoff between the torque generation and mechanical deflection.

Original languageEnglish
Title of host publication2020 International Conference on Electrical Machines (ICEM)
Subtitle of host publicationProceedings
Place of PublicationPiscataway
Number of pages7
ISBN (Electronic)978-1-7281-9945-0
ISBN (Print)978-1-7281-9946-7
Publication statusPublished - 2020
Event2020 International Conference on Electrical Machines, ICEM 2020 - Virtual, Gothenburg, Sweden
Duration: 23 Aug 202026 Aug 2020


Conference2020 International Conference on Electrical Machines, ICEM 2020
CityVirtual, Gothenburg

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • Permanent magnet generators
  • Pseudo direct-drive
  • Structural dynamics
  • Wind turbine generator


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