Development on in-phase actuator mechanism in hard disk drives papers

This research shows the new design concept of an actuator in hard disk drives. The actuator which has several higher-order mechanical resonance determine the stability and mechanical noise suppression ability of the servo control system. We presented the new design concept that higher resonance are made in-phase to the first major resonance. In this concept, all the resonance with high gain are in-phase but the out-phase resonance's gain are reduced. It is shown that the prototype actuator based on this concept can be compensated only by the compensator which is designed for the first major resonance.