Abstract
Active Magnetic Bearings (AMBs), which utilize magnetic levitation technology, have recently been applied to industrial rotors. The controller of AMBs is needed for stabilizing the instability of high order bending modes, which is called the spill over instability, because a rotor has many eigen modes. In this paper, the mode control and the design method of a digital controller are described. We propose to apply a new type of compensator, Phase Shifting Filter, instead of a Notch filter, which works well for the stabilization of the spillover instability. By using the phase shifting filter, we designed the AMB controller to provide the optimal damping against high order bending modes. The stability margin against the spillover instability is evaluated by using open loop transfer functions and sensitivity functions in numerical simulations and experiments. Finally, the rotational speed successfully passed the second bending critical speed during the rotational test by using this controller.
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