Disturbance Rejection on AMBs by Cascade Controllers

This paper deals with the study of disturbance effects carried out on active magnetic bearings when cascade controllers are inserted into the feedback control loops. Since the disturbances affecting an active magnetic bearing has its origin in one or more of the elements: machine rotor due to mechanical and/or magnetic disturbances, which can be measured and predicted simultaneously based on the electromagnets models, well adjusted cascade controllers contributes to performance under abrupt load changes. Achieved results by simulation of a case study are shown and discussed.