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Viewing report
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Auxiliary Bearing Design Guides in Active Magnetic
Bearing System. Edition No. 1
VDM Publishing House, Sep 2008, Pages: 244
In this book, a high fidelity ball bearing and
squeeze film damper (SFD) model including thermal
effects is developed for an energy storage flywheel
system with active magnetic bearings (AMBs). A high
fidelity nonlinear ball bearing employs the Hertzian
contact load-deflection model between ball and
races, and predicts ball contact load and stress
during rotor drop. Thermal growths and expansions of
bearing components are estimated and applied to the
ball bearing dynamics. A SFD model, based on FEM,
determines oil film pressure distribution,
calculates viscous damping force correcting oil film
cavitation and predicts power loss due to viscous
dissipation in oil film. Using the model
capabilities, a variety of simulations for the
energy storage flywheel system are conducted to
investigate the effects of auxiliary bearing design
parameters on the dynamic responses of flywheel
rotor drop. Auxiliary bearing design guides to
provide safe landing of rotor and to prevent high
speed backward whirl are presented based on
performance indices from the simulation
results.
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