Patent ID: 9190088
Filing Date: 2015-11-17
Classification: G11B

Abstract:
1. A control system for aligning a first element coupled to an actuator with a second element of a main system, the control system comprising: a position sensor configured to measure an absolute position of the first element relative to the main system as a sensor signal; a position error signal-based compensator configured to generate a second control signal as a function of a position error signal, wherein the position error signal indicates a relative position of the first element as a difference between the actual position of the first element and a target position of the first element relative to the second element, and wherein the position error signal is determined depending on a system delay using a system delay model; a sensor-based compensator configured to generate a first control signal as a function of the sensor signal and the second control signal; and an actuator configured to change the position of the first element relative to the second element dependent on the first control signal in order to align the first element with the second element.