JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2018, Vol. 48 ›› Issue (2): 86-93.doi: 10.6040/j.issn.1672-3961.0.2017.591

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Design of H∞ controller for magnetic thrust bearing system based on V-Gap metric

CUI Hengbin1, ZHOU Jin1*, DONG Jiyong2, JIN Chaowu1   

  1. 1. Mechanical and electrical College, Nanjing University of Aeronautics &
    Astronautics, Nanjing 210016, Jiangsu, China;
    2. Nanjing CIGU Co., Ltd, Nanjing 211102, Jiangsu, China
  • Received:2017-09-14 Online:2018-04-20 Published:2017-09-14

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Abstract: The realization of surge control strategy for active magnetic bearing suspended centrifugal compressor with changing tip clearance requires that magnetic thrust bearing system could control the rotor accurately tracking the axial position and deal with the problem of variable axial load. Therefore, to ensure that magnetic thrust bearing system controller satisfy certain position tracking and anti-jamming performances, a precise model for magnetic thrust bearing system was built and combined with the V-Gap metric and the generalized stability margin to design H∞ controller. First, the V-Gap metric and the generalized stability margin were introduced. Then, the precise model of magnetic thrust bearing system was built and the system parameter uncertainties were analyzed based on the V-Gap metric. Finally, based on the mixed weighted sensitivity H∞control method, the controller design method based on the generalized stability margin was proposed, and its rationality was verified by experiments. The results showed that the designed H∞ controller had better robustness and position tracking performance.

Key words: controller design, generalized stability margin, V-Gap metric, position tracking, magnetic thrust bearing system, parameter uncertainties

CLC Number: 

  • TP273
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