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A Novel Flux Focusing Magnetically Geared Machine with Reduced Eddy Current Loss

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  • Jin Liu

    (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
    Jiangsu Key Laboratory of Drive and Intelligent Control for Electric Vehicle, Zhenjiang 212013, China)

  • Wenxiang Zhao

    (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
    Jiangsu Key Laboratory of Drive and Intelligent Control for Electric Vehicle, Zhenjiang 212013, China)

  • Jinghua Ji

    (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
    Jiangsu Key Laboratory of Drive and Intelligent Control for Electric Vehicle, Zhenjiang 212013, China)

  • Guohai Liu

    (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
    Jiangsu Key Laboratory of Drive and Intelligent Control for Electric Vehicle, Zhenjiang 212013, China)

  • Tao Tao

    (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
    Jiangsu Key Laboratory of Drive and Intelligent Control for Electric Vehicle, Zhenjiang 212013, China)

Abstract

This paper proposes a novel flux focusing magnetically geared (MG) machine for wind power generation, considering the permanent magnets (PMs) eddy current loss and the balance between the pull-out torque of MG machine and the back-electromotive force (EMF)of the PM brushless machine. The PM eddy current loss in the two rotors of the conventional surface-mounted MG machine is calculated and analyzed by using finite-element method. By adopting serial-spoke structure in the inner rotor, a novel rotor structure for a MG machine is proposed to reduce the PM eddy current loss. Moreover, in order to balance the pull-out torque and the back-EMF, several serial-spoke structures and the main design parameters are investigated. Then, a quantitative comparison between the proposed topology and the conventional surface-mounted MG machine is performed. The analysis results indicate that the PM eddy current loss of the proposed MG machine can be significantly reduced and its pull-out torque and back-EMF can be balanced well.

Suggested Citation

  • Jin Liu & Wenxiang Zhao & Jinghua Ji & Guohai Liu & Tao Tao, 2016. "A Novel Flux Focusing Magnetically Geared Machine with Reduced Eddy Current Loss," Energies, MDPI, vol. 9(11), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:11:p:904-:d:81992
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    References listed on IDEAS

    as
    1. Minh Quan Duong & Francesco Grimaccia & Sonia Leva & Marco Mussetta & Kim Hung Le, 2015. "Improving Transient Stability in a Grid-Connected Squirrel-Cage Induction Generator Wind Turbine System Using a Fuzzy Logic Controller," Energies, MDPI, vol. 8(7), pages 1-22, June.
    2. Hye-Ung Shin & Kiwoo Park & Kyo-Beum Lee, 2015. "A Non-Unity Torque Sharing Function for Torque Ripple Minimization of Switched Reluctance Generators in Wind Power Systems," Energies, MDPI, vol. 8(10), pages 1-17, October.
    3. Chunhua Liu & K. T. Chau, 2014. "Electromagnetic Design of a New Electrically Controlled Magnetic Variable-Speed Gearing Machine," Energies, MDPI, vol. 7(3), pages 1-16, March.
    4. Yiduan Chen & Weinong Fu, 2015. "A Novel Hybrid-Flux Magnetic Gear and Its Performance Analysis Using the 3-D Finite Element Method," Energies, MDPI, vol. 8(5), pages 1-15, April.
    5. Dan Wang & Chongru Liu & Gengyin Li, 2016. "An Optimal Integrated Control Scheme for Permanent Magnet Synchronous Generator-Based Wind Turbines under Asymmetrical Grid Fault Conditions," Energies, MDPI, vol. 9(4), pages 1-27, April.
    6. Ningjun Feng & Haitao Yu & Minqiang Hu & Chunyuan Liu & Lei Huang & Zhenchuan Shi, 2016. "A Study on a Linear Magnetic-Geared Interior Permanent Magnet Generator for Direct-Drive Wave Energy Conversion," Energies, MDPI, vol. 9(7), pages 1-12, June.
    7. Xiaoxu Zhang & Xiao Liu & Chao Wang & Zhe Chen, 2014. "Analysis and Design Optimization of a Coaxial Surface-Mounted Permanent-Magnet Magnetic Gear," Energies, MDPI, vol. 7(12), pages 1-19, December.
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    Cited by:

    1. Yujun Shi & Linni Jian, 2018. "A Novel Dual-Permanent-Magnet-Excited Machine with Flux Strengthening Effect for Low-Speed Large-Torque Applications," Energies, MDPI, vol. 11(1), pages 1-17, January.

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