Rotor unbalance, common phenomenon of rotational systems, manifests itself as a periodic disturbance synchronized with the rotor's angular velocity. In active magnetic bearing (AMB) systems, feedback control is required to stabilize the open-loop unstable electromagnetic levitation. Further, feedback action can be added to suppress the repeatable runout but maintain closed-loop stability. In this paper, a plug-in time-varying resonator is designed by inverting cascaded notch filters. This formulation allows flexibility in designing the internal model for appropriate disturbance rejection. The plug-in structure ensures that stability can be maintained for varying rotor speeds. Experimental results of an AMB–rotor system are presented.
Control of Magnetic Bearings for Rotor Unbalance With Plug-In Time-Varying Resonators
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received October 20, 2014; final manuscript received August 20, 2015; published online October 12, 2015. Assoc. Editor: Ryozo Nagamune.
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Kang, C., and Tsao, T. (October 12, 2015). "Control of Magnetic Bearings for Rotor Unbalance With Plug-In Time-Varying Resonators." ASME. J. Dyn. Sys., Meas., Control. January 2016; 138(1): 011001. https://doi.org/10.1115/1.4031575
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