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This paper proposes a robust H∞ controller based on Multi-objective genetic algorithms (MOGAs) to control the active magnetic bearings (AMBs) with application to superfluid helium cryogenic centrifugal compressor (CCC). Basic weighting function formulas with seven parameters in all are suggested for H∞ controller, whose physical connections with system performance are clearly explained. Weighting...
This paper describes impact of nonlinearities of the radial force on decentralized control of active magnetic bearings (AMBs). Two cases with different design are analyzed; one with a considerable impact of magnetic nonlinearities, and other with almost linear magnetic properties. The current and position-dependent radial forces are determined by finite element computation over the entire operating...
A linearized model of active magnetic bearings (AMBs) is normally used for determining the settings of decentralized PID controllers, which are used in industrial applications. Parameters of the linearized model, i.e., current gain and position stiffness, are defined for the nominal operating point and, thus, vary according to the operating point. These variations are analyzed by the finite element...
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