Following to the seeking operation to the target position for the controlled target which includes the program null mobile for looping gain adjustment of program for band rejection filter adjustment of portable

摘要

PROBLEM TO BE SOLVED: To carry out the compensation of a resonance mode of an object to be controlled such as a moving head and the adjustment of the loop gain of a control system without using a testing signal anew nor impairing convenience on the product user side.;SOLUTION: Head position control signals of a feedforward controller 11 and a feedback controller 12 are applied to a VCM 2 via multiplication processing at a multiplier 13 and attenuation processing at a notch filter 14. The resonance mode of the VCM 2 and head 3 is compensated by the attenuation processing. A mechanical compliance property estimating apparatus 15 obtains the transmission gain of a position error signal pos (=x0-x) and a VCM driving current signal (=i) when seeking a target track on the basis of the operation of the controller 11, and dynamically estimates the respective optimum values of the gain K of the multiplier 13 and the center frequency Fc of the notch filter 14 at that point of time to adjust K and Fc.;COPYRIGHT: (C)2002,JPO