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A Rare-Earth Free Magnetically Geared Generator for Direct-Drive Wind Turbines

Author

Listed:
  • Reza Zeinali

    (Electrical and Electronics Engineering, Middle East Technical University (METU), Ankara 06800, Turkey)

  • Ozan Keysan

    (Electrical and Electronics Engineering, Middle East Technical University (METU), Ankara 06800, Turkey)

Abstract

A novel Vernier type magnetically geared direct-drive generator for large wind turbines is introduced in this paper. Conventional Vernier-type machines and most of the direct-drive wind turbine generators use excessive amount of permanent magnet, which increases the overall cost and makes the manufacturing process challenging. In this paper, an electrically excited (PM_less) claw-pole type Vernier machine is presented. This new topology has the potential of reducing mass and cost of the generator, and can make the construction easy in manufacturing and handling. Analytical designs are verified using 3D finite-element simulations and several designs are evaluated to find the optimum design for a 7.5 MW, 12 rpm wind turbine application. It is shown, that the required torque can be achieved with an outer diameter of 7.5 m, and with a mass of 172 t (including the structural mass). The proposed generator is compared with commercial direct-drive generators, and it is found that the proposed generator has the highest torque density with 34.7 kNm/t.

Suggested Citation

  • Reza Zeinali & Ozan Keysan, 2019. "A Rare-Earth Free Magnetically Geared Generator for Direct-Drive Wind Turbines," Energies, MDPI, vol. 12(3), pages 1-15, January.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:3:p:447-:d:202187
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    References listed on IDEAS

    as
    1. Riba, Jordi-Roger & López-Torres, Carlos & Romeral, Luís & Garcia, Antoni, 2016. "Rare-earth-free propulsion motors for electric vehicles: A technology review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 367-379.
    2. Chengcheng Liu & Jiawei Lu & Youhua Wang & Gang Lei & Jianguo Zhu & Youguang Guo, 2018. "Design Issues for Claw Pole Machines with Soft Magnetic Composite Cores," Energies, MDPI, vol. 11(8), pages 1-15, August.
    3. Bilgili, Mehmet & Yasar, Abdulkadir & Simsek, Erdogan, 2011. "Offshore wind power development in Europe and its comparison with onshore counterpart," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(2), pages 905-915, February.
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    Cited by:

    1. Khalil Touimi & Mohamed Benbouzid & Zhe Chen, 2020. "Optimal Design of a Multibrid Permanent Magnet Generator for a Tidal Stream Turbine," Energies, MDPI, vol. 13(2), pages 1-19, January.
    2. Gerardo Ruiz-Ponce & Marco A. Arjona & Concepcion Hernandez & Rafael Escarela-Perez, 2023. "A Review of Magnetic Gear Technologies Used in Mechanical Power Transmission," Energies, MDPI, vol. 16(4), pages 1-32, February.
    3. Anna Przybył & Piotr Gębara & Roman Gozdur & Krzysztof Chwastek, 2022. "Modeling of Magnetic Properties of Rare-Earth Hard Magnets," Energies, MDPI, vol. 15(21), pages 1-18, October.

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