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Basic Characteristics and Design of a Novel Hybrid Magnetic Bearing for Wind Turbines

Author

Listed:
  • Yanjun Yu

    (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Weiyu Zhang

    (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Yuxin Sun

    (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Peifeng Xu

    (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China)

Abstract

This paper proposes a five-degree-of-freedom (5-DOF) hybrid magnetic bearing (HMB) for direct-drive wind turbines, which can realize suspension in the 4-DOF radial and 1-DOF axial directions. Only two sets of radial control windings are employed in the proposed HMB because only one set of radial control windings can achieve the 2-DOF suspension in the radial direction. Unlike the traditional active thrust magnetic bearings, this paper uses a cylindrical rotor core without a large thrust disc in the novel HMB. The numbers of the controller, power amplifier and system volume can be reduced in the magnetic suspension system. This paper also presents the structure and basic characteristics of the proposed magnetic bearing. A precision equivalent magnetic circuit analysis of the permanent magnet ring and control magnetic field is conducted in this study, in consideration of the non-uniform distribution of magnetic density. Accordingly, the mathematical models, including the suspension force expression, are derived based on the accurate equivalent magnetic circuit. The basic principle of the structure parameter design is presented, based on the given key parameters. The accuracy of the analytical method is further validated by 3D finite element analysis.

Suggested Citation

  • Yanjun Yu & Weiyu Zhang & Yuxin Sun & Peifeng Xu, 2016. "Basic Characteristics and Design of a Novel Hybrid Magnetic Bearing for Wind Turbines," Energies, MDPI, vol. 9(11), pages 1-17, November.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:11:p:905-:d:81997
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    References listed on IDEAS

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    1. Huangqiu Zhu & Shuling Ding & Jintao Jv, 2016. "Modeling for Three-Pole Radial Hybrid Magnetic Bearing Considering Edge Effect," Energies, MDPI, vol. 9(5), pages 1-15, May.
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    Cited by:

    1. Lei Xu & Mingyao Lin & Xinghe Fu & Kai Liu & Baocheng Guo, 2017. "Analytical Calculation of the Magnetic Field Distribution in a Linear and Rotary Machine with an Orthogonally Arrayed Permanent Magnet," Energies, MDPI, vol. 10(4), pages 1-18, April.
    2. Zan He & Tong Wen & Xu Liu & Yuchen Suo, 2022. "Loss Estimation and Thermal Analysis of a Magnetic Levitation Reaction Flywheel with PMB and AMB for Satellite Application," Energies, MDPI, vol. 15(4), pages 1-20, February.

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