On AMBs Diagnosis by Analytical Redundancy

This paper deals with the study of the diagnosis task carried out on active magnetic bearings on the basis of analytical redundancy. Since the faults affecting an active magnetic bearing has its origin in one or more of the elements: coil circuit, sensors or machine rotor due to mechanical and/or magnetic disturbances, coils current is a reliable variable which can be measured and predicted simultaneously based on the electromagnets models. This information is used to diagnose the closed loop controlled mechanical system using analytical redundancy associated to a parity space approach. Achieved results by simulation of a case study are shown and discussed.