Effect of Thrust Magnetic Bearing on Stability and Bifurcation of a Flexible Rotor Active Magnetic Bearing System

[+] Author and Article Information
Y. S. Ho, H. Liu

Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, P.R. China

L. Yu

Theory of Lubrication and Bearing Institute, Xi’an Jiaotong University, Xi’an, Shaanxi, P.R. China

J. Vib. Acoust 125(3), 307-316 (Jun 18, 2003) (10 pages) doi:10.1115/1.1570448 History: Revised October 01, 2002; Received November 01, 2002; Online June 18, 2003
Copyright © 2003 by ASME
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Structure of a flexible rotor-active magnetic bearing system
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Shaft finite element model
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End view of an eight-pole journal bearing
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A thrust magnetic bearing in operation
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Magnetic flux path in a thrust magnetic bearing
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Signal flow in a rotor-active magnetic bearing system
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A e0−ω diagram of Stable and unstable regions of T period motion
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Hopf T periodic solution without TAMB (a) Hopf T periodic solution at ω=120000 rev/min (b) A amplitude-frequency diagram of xa
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Hopf T periodic solution with TAMB (a) Hopf T periodic solution at ω=70000 rev/min (b) A amplitude-frequency diagram of xa
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Quasi-periodic solution without TAMB (e0=4 μm) (a) Quasi-periodic solution at ω=113405 rev/min (b) The orbit of the center of the rotor at journal bearing ‘a’ (c) Poincare maps (d) Time series of xa (e) Amplitude-frequency diagram of xa
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Quasi-periodic solution with TAMB (e0=4 μm) (a) Quasi-periodic solution at ω=67345 rev/min (b) The orbit of the center of the rotor at journal bearing ‘a’ (c) Poincare maps (d) Time series of xa (e) Amplitude-frequency diagram of xa
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Stable T periodic motion at ω=30000 rev/min,e0=10 μm (a) With TAMB (b) Without TAMB
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Stable Quasi-periodic motion at ω=30000 rev/min,e0=22.5 μm with TAMB (a) Stable Quasi-periodic motion (b) Poincare maps
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Stable periodic motion at ω=30000 rev/min,e0=22.5 μm without TAMB



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