Delevitation modelling of an active magnetic bearing supported rotor
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Date
Authors
Janse van Rensburg, Jan J.
Van Schoor, George
Van Vuuren, Pieter A.
Journal Title
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Volume Title
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s.n
Curran Associates
Curran Associates
Abstract
For active magnetic bearings (AMBs) to be used with confidence in industrial applications, the safe
failure of the AMB system should be guaranteed. The exact behaviour of the rotor on the backup bearings (BBs)
is relatively uncertain [1,2,3]. Uncertainty in a failure situation means that the safe failure of the AMB system
cannot be guaranteed. The purpose of the presented rotor delevitation simulation model (RDSim model) is to
eliminate some of the uncertainties associated with a rotor delevitation event.
The simulation model includes a flexible rotor model [4], a non-linear AMB model [5], a non-linear BB model,
stator effects, active rotor braking, rotor free running, inner race speed up, AMB/BB load sharing and sudden
unbalance (blade-loss simulation). The RDSim model can be used to simulate any AMB failure on one or more
locations. The failure modes include power amplifier (PA) malfunction, AMB coil short-circuit, total power
failure and controller failure.
This paper will discuss the BBSim model; a brief explanation of each of the sub-models of the BBSim model is
also given.
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Citation
Janse van Rensburg, J.J. et. al. 2010. Delevitation modelling of an active magnetic bearing supported rotor. The Twelfth International Symposium on Magnetic Bearings (ISMB 12), Wuhan, China, August 22-25. pp. 367-375.