Storage apparatus, spindle motor control method, and program
AssigneeFujitsu Limited
InventorHiroshi Oyabu
Life of this patent
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Abstract
A default gain table stores values of loop gain of a spindle motor control unit predetermined for each number of media. A loop gain setting unit detects the number of media, reads out a loop gain corresponding to the detected number of media from the default gain table and sets it in the spindle motor control unit. A loop gain measuring unit measures the loop gain of the spindle motor control unit during a test in the manufacturing process, adjusts it into an optimum loop gain, and stores it as a default lop gain in the apparatus.
Claims20
A storage apparatus having a spindle motor control unit which servo-controls a spindle motor so as to maintain a medium at certain revolutions, comprising:
- a loop gain storing unit which stores a loop gains of said spindle motor control unit predetermined for each sheet of medium;
- and
- a loop gain setting unit which detects the number of sheets of said medium, reads out a loop gain corresponding to the detected number of media from said loop gain storing unit and sends it in said spindle motor control unit.
A spindle motor control method of a storage apparatus comprising:
- a spindle motor controlling step of servo-controlling a spindle motor so as to keep a medium at constant revolutions;
- a loop gain storing step of storing the loop gain of said spindle motor controlling step predetermined for each number of sheets of medium;
- and
- a loop gain setting step of detecting the number of said media, reading out a loop gain corresponding to the detected number of media from said loop gain storing step, and setting it to said spindle motor controlling step.
A spindle motor control apparatus which servo-controls a spindle motor so as to maintain a medium at certain revolutions, comprising:
- a loop gain storing unit which stores a loop gains of said spindle motor control unit predetermined for each sheet of medium;
- and
- a loop gain setting unit which detects the number of sheets of said medium, reads out a loop gain corresponding to the detected number of media from said loop gain storing unit and sends it in said spindle motor control apparatus.
Dependencies are inferred from the claim text.