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Multiple Integrator Table for Seek with Non-Linear Factor at High Track Per Inch

IP.com Disclosure Number: IPCOM000118483D
Original Publication Date: 1997-Feb-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 61K

Publishing Venue

IBM

Related People

Ozawa, Y: AUTHOR [+2]

Abstract

Call seek routine | V No Seek direction Inner? -> use table for Outer direction |Yes V use Table for Inner direction | V Check Category if N | V use N-th integrator table | V setup other Seek Parameter | V start actual seek motion | V end Fig. 1 Flow chart

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Multiple Integrator Table for Seek with Non-Linear Factor at High
Track Per Inch

      Call seek routine
          |
          V                 No
        Seek direction Inner? -> use table for Outer direction
          |Yes
          V
        use Table for Inner direction
          |
          V
        Check Category if N
          |
          V
        use N-th integrator table
          |
          V
        setup other Seek Parameter
          |
          V
        start actual seek motion
          |
          V
         end
  Fig. 1  Flow chart

      Disclosed is a method to improve non-linear effect at an
actuator pivot for seek operation of a hard disk drive, especially at
High Track density.

      Non-linear effect of an actuator movement becomes bigger,
especially at short track seek operation in a thermal stressed
condition.  Hi-track pitch density also emphasizes this effect.  It
is mainly coming from a thermal characteristic of a grease or bearing
at a pivot and tension force of a flexible cable which is wiring from
the AE module circuit to the Read/Write heads on a Voice Coil Motor
(VCM) actuator arm.

      The use of multiple integrator tables is effective against this
non-linearity.  Convergence value of the integrator at track
following mode...