Patent ID: 7394218
Filing Date: 2008-07-01
Classification: G11B

Abstract:
1. A servo control system micro-electromechanical systems (MEMS)-based motion control system, comprising: a motion generator having an inherent stiffness component; a feed-forward element for canceling the inherent stiffness component of the motion generator of said micro-electromechanical systems (MEMS)-based motion control system; a node coupled to receive an input from said feed-forward element, wherein said feed-forward element comprises one of a linear stiffness unit and a look-up table for storing therein complex stiffnesses, for generating a stiffness component, based on a target position first-axis reference signal, for being input to said node; a servo controller for receiving a position error signal based on a target position first-axis reference signal, and a reference velocity; a node for receiving an input target position first axis-reference value; a k a look-up table for storing values representing complex stiffnesses, wherein said node further receives a measured motion generator position first axis-signal from the motion generator, wherein said node for receiving determines a difference between the input target position first axis-reference value and the measured motion generator position first axis-signal and, based on the difference, said node for receiving outputs a position error signal to said servo controller, wherein said servo controller outputs a signal to a summing node, which also receives inputs from said k wherein the stiffness term is fed forward without waiting for the servo controller to build up, wherein the stiffness of said scanner, when counterbalanced by said feed forward component, minimizes a position error of said scanner due to a ramp motion, and wherein an electronically-generated force is applied to the scanner to eliminate the stiffness.