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.