Abstract
This paper describes a new type of two stage servo head arm for magnetic disk drives. The four PZT actuators are bonded to the stainless steel head arm. The PZT actuators are used for the accurate follow-up of a track and to control some of vibration modes of the head arm. The servo system has a bandwidth of more than 2 kHz. The PID control method was used in the design of controllers for vibration control and tracking motion control of the arm. The characteristics of a prototype of the servo system were measured and its effectiveness was verified by experiment.
