Abstract
This paper presents a new approach, called adaptive autocentering, that attenuates synchronous transmitted force due to imbalance in an active magnetic bearing system. The basic principle is to perform on-line identification of rotor imbalance and adaptively tune a controller that stabilizes the motion of the rotor's mass center and principal axis of inertia. Unlike the usual strategy of adaptive feedforward compensation, which adaptively cancels the effects of rotor imbalance modeled as synchronous disturbance or measurement noise, adaptive autocentering control is frequency independent and can achieve the control objective under varying rotor speed.
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