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Influence of conical degree on the performance of radial and axial integrated auxiliary bearing for active magnetic bearing system

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Abstract

In this paper, a radial and axial integrated auxiliary bearing (RAIAB) device which can eliminate all radial and axial protective clearances after the rotor dropping is proposed to improve the reliability of the active magnetic bearing systems. In the proposed RAIAB, a strategy that the rotor end and the inner bushing are machined into conical surface is adopted so that the radial and axial clearances between the rotor and the inner bushing can be eliminated simultaneously when the inner bushing moves along the axial direction. In order to research the influence of the conical degree of the inner bushing on the performance of the RAIAB, the preliminary prototype experimental rig is developed and the cases of a 5 degree of freedom AMB rotor dropping on RAIABs at maximum speed of 30000 rpm are tested. The experimental results show that the RAIAB installed with a 30-conical degree inner bushing can successfully eliminate all protective clearances after the AMB rotor drops. However, the RAIAB installed with a 45-conical degree inner bushing is not able to eliminate clearance when the dropping speed of the rotor exceeds 18000 rpm.

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Abbreviations

F a :

Axial force acting on the inner bushing

F r :

Radial force acting on the inner bushing

θ l :

Conical degree of inner bushing

ρ a :

Axial clearance between rotor and inner bushing

ρ r :

Radial clearance between rotor and inner bushing

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Acknowledgments

This research was supported by the National Nature Science Foundation of China (no. 51605208), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Nos.16KJB460008 and 18KJB140004) and by the major project of natural science research in universities of Jiangsu (Grant No.16KJA460002).

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Authors and Affiliations

  1. School of Mechanical Engineering, Jiangsu University of Technology, 1801 Zhongwu Rd., Changzhou, China

    Chengtao Yu, Hongchang Wang, Fan Shi, Yu Chen & Wentao Shan

  2. School of Mathematics and Physics, Jiangsu University of Technology, 1801 Zhongwu Rd., Changzhou, China

    Yuemei Sun

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  1. Chengtao Yu
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  2. Yuemei Sun
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  3. Hongchang Wang
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  4. Fan Shi
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  5. Yu Chen
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Correspondence to Chengtao Yu.

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Chengtao Yu received his Ph.D. in Mechanical Engineering from Nanjing University of Aeronautics and Astronautics. His is currently a Lecturer in the School of Mechanical Engineering, Jiangsu University of Technology. His research interests include auxiliary bearing for active magnetic bearing system, rotor dynamics, and mechanical design.

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Yu, C., Sun, Y., Wang, H. et al. Influence of conical degree on the performance of radial and axial integrated auxiliary bearing for active magnetic bearing system. J Mech Sci Technol 33, 4681–4687 (2019). https://doi.org/10.1007/s12206-019-0911-z

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  • DOI: https://doi.org/10.1007/s12206-019-0911-z

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