Research on New Displacement Sensor Used in Active Magnetic Bearing Systems

  • Lian-Xiao Xue
  • Kai ZhangEmail author
  • Yang Xu
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 455)


Active magnetic bearings (AMBs) play an important role in the helium turbine of High Temperature Gas-cooled Reactor (HTR). As one of the main components of the AMB, the displacement sensor influences the performance of the whole AMB system. In this paper, a new radial displacement sensor which characterized by high cost-efficiency, high accuracy, high sensitivity, and compact structure is discussed. Through establishing an equivalent model of the sensor, the theory of the sensor was derived. Then, a finite element model was constructed to analyze various factors that affect the sensor sensitivity and structure. Furthermore, an experimental platform was built to evaluate the sensor. As a result, the sensor exhibited an original sensitivity of 38.94 mV/µm, a good linearity of 1.87% and a low X-Y coupling degree of 2.14%. This sensor was applied to an AMB system and achieved stable suspension at a speed of 12 000 rpm. It is expected to be extended to HTR related applications due to its excellent performance.


HTR AMB Eddy current sensor Finite element analysis 


  1. 1.
    Bleuler, H., Cole, M., Keogh, P., et al.: Magnetic Bearings: Theory, Design, and Application to Rotating Machinery. Springer Science & Business Media, Heidelberg (2009)Google Scholar
  2. 2.
    Bühler, P.: Device for contact-less measurement of distances in multiple directions. European Patent No. EP 1: 422-492 (2004)Google Scholar
  3. 3.
    Burdet, L.: Active magnetic bearing design and characterization for high temperature applications. École Polytechnique Fédérale de Lausanne, Lausanne (2006)Google Scholar
  4. 4.
    Burdet, L., Maeder, T., Siegwart, R., et al.: Thick-film radial position sensor for high temperature active magnetic bearings. In: 10th International Symposium on Magnetic Bearings, Martigny, Switzerland (2006)Google Scholar
  5. 5.
    Hawkins, L.A., Zhu, L., Blumber, E.J.: Development of a 125 kW AMB expander/generator for waste heat recovery. J. Eng. Gas Turbines Power. 133(7), 072503 (2011)Google Scholar
  6. 6.
    Larsonneur, R., Bühler, P.: New radial sensor for active magnetic bearings. In: 9th International Symposium on Magnetic Bearings, Lexington, USA (2004)Google Scholar
  7. 7.
    Muesing, A., Zingerli, C., Imoberdorf, P., et al.: PEEC-based numerical optimization of compact radial position sensors for active magnetic bearings. In: 5th International Conference on VDE Integrated Power Systems (CIPS), pp. 1–5 (2008)Google Scholar
  8. 8.
    Zingerli, C.M., Imoberdorf, P., Kolar, J.W., et al.: Rotor position measurement for a magnetically levitated 500’000 rpm permanent magnet machine. In: Energy Conversion Congress and Exposition (ECCE), pp. 1778–1784. IEEE (2011)Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Department of Engineering PhysicsTsinghua UniversityBeijingChina

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