Experimental modeling and feedback control of a piezobased milliactuator
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abstract
In magnetic disk-drive actuators, requirements to record and read data at higher track densities has made mechanical resonances of the servo actuator, suspension, and the head gimbal assembly a critial consideration. The application of piezoelectric material in the servo actuator can be used to refine and accomplish track following in (extremely) high-track-density magnetic data storage by controlling the mechanical resonance modes and serving as a so-called milliactuator. In this paper the results on the modeling and control of a piezobased milliactuator are presented. The modeling is done on the basis of a least-squares curve fitting of an estimated frequency response and by taking into account uncertainties in the modeled resonance modes of the servo actuator. The design and implementation of a robust controller provide a high bandwidth and accurate positioning of the tip of the suspension and illustrate the efficiency of the piezobased milliactuator.
