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Decoupling Control for High-Speed Magnetically Suspended Rotor Systems Using Linear Active Disturbance Rejection Method

This paper explores a decoupling control scheme based on the linear active disturbance rejection control (LADRC) for the couplings of the high-speed magnetic suspension rotor (MSR) system with significant gyroscopic effects supported by the active magnetic bearings (AMBs). Firstly, the coupling disturbances caused by significant gyroscopic effects of the four radial DOFs of the MSR system are analyzed. The generalized mathematical model of MSR system with four radial channels is established, and the relationship between the phase lag of the power amplifier and the rotor speed is also obtained. Since the nutation instability is mainly introduced by the phase lag, the LADRC controller in each radial channel is constructed to improve the phase margin of the close-loop system. And a parameter tuning procedure based on the phase compensation on the frequency domain is proposed. Finally, the simulation results show that the proposed method has a good performance for decoupling control of the cross-couplings among the radial channels under the step responses. The control accuracy and nutation stability of the MSR system are also improved effectively.