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Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator

Author

Listed:
  • Miguel García-Gracia

    (Department of Electrical Engineering, University of Zaragoza, 50018 Zaragoza, Spain)

  • Ángel Jiménez Romero

    (Department of Electrical Engineering, University of Zaragoza, 50018 Zaragoza, Spain)

  • Jorge Herrero Ciudad

    (For Optimal Renewable Energy Systems, S.L. (4fores), 50197 Zaragoza, Spain)

  • Susana Martín Arroyo

    (Department of Electrical Engineering, University of Zaragoza, 50018 Zaragoza, Spain)

Abstract

Cogging torque is a pulsating, parasitic, and undesired torque ripple intrinsic of the design of a permanent magnet synchronous generator (PMSG), which should be minimized due to its adverse effects: vibration and noise. In addition, as aerodynamic power is low during start-up at low wind speeds in small wind energy systems, the cogging torque must be as low as possible to achieve a low cut-in speed. A novel mitigation technique using compound pre-slotting, based on a combination of magnetic and non-magnetic materials, is investigated. The finite element technique is used to calculate the cogging torque of a real PMSG design for a small wind turbine, with and without using compound pre-slotting. The results show that cogging torque can be reduced by a factor of 48% with this technique, while avoiding the main drawback of the conventional closed slot technique: the reduction of induced voltage due to leakage flux between stator teeth. Furthermore, through a combination of pre-slotting and other cogging torque optimization techniques, cogging torque can be reduced by 84% for a given design.

Suggested Citation

  • Miguel García-Gracia & Ángel Jiménez Romero & Jorge Herrero Ciudad & Susana Martín Arroyo, 2018. "Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator," Energies, MDPI, vol. 11(11), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:3219-:d:184161
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    References listed on IDEAS

    as
    1. Chengcheng Liu & Jiawei Lu & Youhua Wang & Gang Lei & Jianguo Zhu & Youguang Guo, 2017. "Techniques for Reduction of the Cogging Torque in Claw Pole Machines with SMC Cores," Energies, MDPI, vol. 10(10), pages 1-17, October.
    2. Chun-Yu Hsiao & Sheng-Nian Yeh & Jonq-Chin Hwang, 2011. "A Novel Cogging Torque Simulation Method for Permanent-Magnet Synchronous Machines," Energies, MDPI, vol. 4(12), pages 1-14, December.
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    Citations

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    Cited by:

    1. Sandra Eriksson, 2019. "Permanent Magnet Synchronous Machines," Energies, MDPI, vol. 12(14), pages 1-5, July.
    2. Chung-Seong Lee & Hae-Joong Kim, 2022. "Harmonic Order Analysis of Cogging Torque for Interior Permanent Magnet Synchronous Motor Considering Manufacturing Disturbances," Energies, MDPI, vol. 15(7), pages 1-13, March.
    3. T. A. Anuja & M. Arun Noyal Doss, 2021. "Reduction of Cogging Torque in Surface Mounted Permanent Magnet Brushless DC Motor by Adapting Rotor Magnetic Displacement," Energies, MDPI, vol. 14(10), pages 1-20, May.
    4. Nikolaos Chrysochoidis-Antsos & Gerard J.W. van Bussel & Jan Bozelie & Sander M. Mertens & Ad J.M. van Wijk, 2021. "Performance Characteristics of A Micro Wind Turbine Integrated on A Noise Barrier," Energies, MDPI, vol. 14(5), pages 1-29, February.

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