Performance Tests of a Permanent Magnet Thrust Bearing for a Hydropower Synchronous Generator Test-Rig
Keywords:
Axial bearing, Halbach array, hydropower, magnetic bearing, permanent magnet, thrust bearingAbstract
Permanent magnets are an attractive material to be utilized in thrust bearings as they offer relatively low losses. If utilized properly, they have a long service lifetime and are virtually maintenance free. In this contribution, we communicate the results of the tests performed on a permanent magnet thrust bearing that was custom built and installed in a hydropower synchronous generator test-rig. Tridimensional finite element simulations were performed and compared with measurements of axial force. Spin down times and axial force ripple have also been measured. We found good correspondence between the measurements and the simulations.
Downloads
References
T. Nakata, “Magnetic thrust bearings,” Fuji Denki Review, vol. 4, no. 2, 1958.
Voith, “Modernization of Europe’s largest solution,” HyPower, no. 2, pp. 38-41, 2002.
M. Nässelqvist, R. Gustavsson, and J. Aidanpää, “Resonance problems in vertical hydropower unit after turbine upgrade,” IAHR 24th Symposium on Hydraulic Machinery and Systems, Foz do Iguaçu, Brazil, Oct. 2008.
R. Ong, J. H. Dymond, R. D. Findlay, and B. Szabados, “Shaft current in AC induction machine – An online monitoring system and prediction rules,” IEEE Transaction on Industry Applications, vol. 37, no. 4, 2001.
A. Bonett and G. C. Soupkup, “Cause and analysis of stator and rotor failures in three-phase squirrelcage induction motors,” IEEE Trans. Ind. Applicat., vol. 28, pp. 921-936, 1992.
Y. I. Baiborodov, A. V. Tereshchenko, A. E. Aleksandrov, V. S. Shchetkin, I. B. Pokrovskii, V. P. Tukmakov, and I. S. Gurbanov, “Results of fullscale tests of the thrust bearing with elastic metalplastic segments for the turbine-generator unit at the Bratsk hydroelectric station,” Hydrotechnical Construction, 16: 348, 1982. doi:10.1007/BF02116888
K. Yamaishi, “Applications and performance of magnetic bearing for water turbine generator,” Proceedings of MAG '97, Industrial Conference and Exhibition on Magnetic Bearings, Virginia, USA, Aug. 1997.
H. Ma, Q. Wang, and P. Ju, “Study of the load reduction for hydrogenerator bearing by hybrid magnetic levitation,” International Journal of Applied Electromagnetics and Mechanics, no. 43, pp. 215-226, 2013.
M. Wallin, M. Ranlöf, and U. Lundin, “Design and construction of a synchronous generator test setup,” XIX International Conference on Electrical Machines – ICEM, Rome, Italy, Sep. 2010.
J. K. Nøland, F. Evestedt, J. J. Pérez-Loya, J. Abrahamsson, and U. Lundin, “Design and characterization of a rotating brushless PM exciter for a synchronous generator test setup,” International Conference on Electrical Machines 2016 (ICEM'16), 2016.
J. Abrahamsson, “Kinetic Energy Storage and Magnetic Bearings for Vehicular Applications,” Ph.D. Dissertation, Uppsala, 2014.
J. Kumbernuss, C. Jian, J. Wang, H. X. Yang, and W. N. Fu, “A novel magnetic levitated bearing system for vertical axis wind turbines (VAWT),” Applied Energy, vol. 90, pp. 148-153, 2012.
J. J. Pérez-Loya, J. de Santiago, and U. Lundin, “Construction of a permanent magnet thrust bearing for a hydropower generator test setup,” 1st Brazilian Workshop on Magnetic Bearings – BWMB, Rio de Janeiro, Brazil, Oct. 2013.
J. J. Pérez-Loya and U. Lundin, “Optimization of force between cylindrical permanent magnets,” Magnetics Letters, IEEE, vol. 5, pp. 1-4, 2014.
Arnold Magnetic Technologies, “Neodymium-IronBoron Magnet Grades Summary Product List & Reference Guide,” Arnold Magnetic Technologies Corp., 2015. [Online]. Available: http://www. arnoldmagnetics.com/Portals/0/Files/Catalogs%20 and%20Lit/Neo/151021/Catalog%20-%20151021. pdf?ver=2015-12-07-103821-497
