Novel Decoupling Control and Eigenstructure Assignment Strategies for Rigid Active Magnetic Bearing Rotor System

Abstract

This paper presents a state feedback decoupling control strategy for an active magnetic bearing (AMB) highspeed flywheel rotor system. The most important aspect of the proposed strategy is to design an appropriate state feedback decoupling control law that ensures that the input and output of the controlled system exhibit a one-to-one relationship. Research indicates that the state feedback gain matrix <tex>$K$</tex> already contains sufficient information to enable arbitrary configuration of the eigenvalues of the controlled system, which is usually an 8th order system. Simulations show that this strategy transforms the four coupled radial channels of the AMB high-speed flywheel rotor system into four independent channels. Arbitrary assignment of all the poles on the complex plane makes it easier to design various controllers and achieve both good control performance and good internal stability. The example presented at the end of the article illustrates the practicability of this control strategy.