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Energies 2016, 9(11), 905; doi:10.3390/en9110905

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

School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
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Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 8 September 2016 / Revised: 20 October 2016 / Accepted: 20 October 2016 / Published: 2 November 2016
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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. View Full-Text
Keywords: hybrid magnetic bearing (HMB); radial control windings; cylindrical rotor; equivalent magnetic circuit method; finite element analysis (FEA); magnetic suspension force hybrid magnetic bearing (HMB); radial control windings; cylindrical rotor; equivalent magnetic circuit method; finite element analysis (FEA); magnetic suspension force
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yu, Y.; Zhang, W.; Sun, Y.; Xu, P. Basic Characteristics and Design of a Novel Hybrid Magnetic Bearing for Wind Turbines. Energies 2016, 9, 905.

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