公开(公告)号：JPH10214116A

公开(公告)日：1998-08-11

申请号：JP326498

申请日：1998-01-09

Applicant: IBM

Inventor： DONALD LEE CLAIR ,  LEWIS JOSEPH SERRANO

IPC: G05D3/12 ,  G11B5/55 ,  G11B21/08

Abstract: PROBLEM TO BE SOLVED: To improve a saturation model used for predicting and updating the head position, speed and current, by changing an algorithm model so as to reflect the actual torque coefficient and actual maximum current level of a voice coil motor(VCM) in a saturation seek mode. SOLUTION: A servo system calculates an estimated VCM control value for indicating a VCM current, calculates the estimated value of the state of the VCM including the head position and the speed and calculates the predicted values of the head position and the speed from the algorithm model. For the modeling, the algorithm model is changed so as to reflect the actual torque coefficient and actual maximum current level of the VCM in the saturation seek mode. The improved modeling of the servo system is provided with the ratio K1 of the measured torque coefficient in the saturation seek mode and a nominal torque coefficient and the ratio K2 of a measured maximum acceleration and a nominal maximum acceleration and incorporates estimated static windage to prediction performed by the saturation model.