Abstract
The dynamic rotor behavior is significantly affected by the stiffness and damping characteristics of the bearings. Therefore, it is important to identify these bearing parameters. For active magnetic bearings (AMBs), these bearing parameters not only could be identified from rotor dynamic response, but also from electrical control system transfer function. Some identification works from rotor dynamic response have been reported, but identification from electrical control system transfer function is relatively few. In this paper, we deduced the equivalent stiffness and damping expressions with electrical control system transfer function for rotor AMBs and identified these values from electrical control system model. To evaluate the identified results, previous reported results from rotor dynamic response is employed for comparison. We found that for the stiffness, a complete and precise electrical control model will obtain relatively consistent values; however, for the damping, the accurate electrical control model is still not enough and the eddy current loss should be included.
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Recommended by Associate Editor Cheolung Cheong
Yuanping Xu received his Ph.D. degree in mechanical engineering from Nanjing University of Aeronautics and Astronautics (NUAA) in 2018. From 2016 to 2017, He was a guest Ph.D. student in Ecole Polytechnique Federale Lausanne (EPFL), Switzerland. He is currently a lecturer in the college of mechanical and electrical engineering, NUAA. His research focuses on magnetic levitation.
Jin Zhou received her Ph.D. degree in mechanical engineering from China University of Mining and Technology (CUMT) in 2001. From 2012 to 2013, she was a visiting scholar in the rotating machinery and control laboratory (ROMAC) of the University of Virginia. She is currently a Full Professor in the college of mechanical and electrical engineering, NUAA. Her research focuses on magnetic bearings and vibration control. She was the member of Program Committee of the 14th International Symposium on Magnetic Bearings (2014) and the Program Chair of the 16th International Symposium on Magnetic Bearings, 2018.
Chaowu Jin obtained the B.S., M.S., and Ph.D. degrees in mechanical engineering from NUAA from 2002 to 2011. He is currently an Associate Professor in the college of mechanical and electrical engineering, NUAA. His research focuses on magnetic bearings.
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Xu, Y., Zhou, J. & Jin, C. Identification of dynamic stiffness and damping in active magnetic bearings using transfer functions of electrical control system. J Mech Sci Technol 33, 571–577 (2019). https://doi.org/10.1007/s12206-019-0110-y
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DOI: https://doi.org/10.1007/s12206-019-0110-y