Pq - improved observer based two-stage servo controller

摘要

The present invention includes a servo control system (150, 250, 400, 500) for controlling a dual stage actuator (152) in a disc drive (110). The disc drive (110) includes a data head for accessing information on a disc surface (112), and the dual stage actuator (152) includes a coarse actuator and at least one fine actuator. The control system includes a fine actuator driver (154, 154') and a coarse actuator driver (156, 156') for driving the fine and coarse actuators, respectively. The control system also includes an observer (402) which receives the coarse and fine actuator input signals and estimates a response of the coarse and fine actuators.