ROBUST UNBALANCE CONTROL FOR ACTIVE MAGNETIC BEARINGS AT LOW ROTATIONAL SPEEDS

概要

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The subject of our study is to develop a new method that aims at cancelling the effect of the unbalance for rotational speeds below the rigid modes frequencies. We propose hear two different approaches : an open-loop method and a closed-loop algorithm called AVR. A full physical model is also developed. A modal state-space model is extracted from a FEM (Finite Element Method) software. The resulting complete model is coupled to a model of the rest of the system, including actuators, detectors, anti-aliasing filters, amplifiers and numerical controller. Then, the first method for unbalance cancellation is used on the complete model. It's a four-step method that consists in identifying the unbalance with two measurements, thanks to two different synchronous signals added. For this open-loop method, a statistical study, considering the variance of the estimator and various extra signals give good insight on the result. Concerning the closed-loop method for unbalance suppression (AVR), the global model is used in order to study precisely the limits of stability and validate the theoretical approach based on the model. We finally apply this method to an air turbine machine.
一般社団法人日本機械学会の論文