Adaptive compensation of microactuator resonance in hard disk drives

This article presents an adaptive resonance compensation scheme for microac tuator-based dual-stage servo system in hard disk drives. The approach is t o identify the microactuator resonant modes and compensate the model accord ingly to a simpler one by pole-zero cancellation. Consequently, the servo c ontroller can be designed based on the compensated fixed model despite actu ator resonant mode variations. Simulation and experiment results show that this adaptive compensation scheme can suppress microactuator resonance with out priori knowledge of the resonant modes, This approach makes the servo c ontrol system robust against microactuator resonance variations.