Method and apparatus to normalize the acceleration constant
AssigneeSeagate Technology LLC
InventorTodd David Baumann
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Abstract
A method and apparatus for normalizing the acceleration constant used by a servo control system in a disc drive are disclosed. The method and apparatus involve performing a test seek and summing the position error measured at sample periods during the deceleration phase of the test seek. A correction factor applied to the acceleration constant is adjusted if the sum of the position errors differs from the sum of position errors measured from a nominal seek. Adjusting the correction factor to cause a position error sum that is close or equal to the sum from the nominal seek provides a relatively symmetrical seek arrival without additional correction factor offsets or gain variances.
Claims20
A method for normalizing an acceleration constant of an electromechanical control system by adjusting a correction factor implemented by the control system, comprising steps of:
- a) measuring a test seek position error at each of several predetermined intervals during a deceleration phase of a test seek;
- b) arithmetically combining the test seek position errors to obtain a test seek value;
- c) adjusting the correction factor if the test seek value differs from a nominal seek value and otherwise not generally adjusting the correction factor.
An actuator controller for a data storage device comprising:
- a servo control system;
- and
- a calibration means for normalizing an acceleration constant of the servo control system.
Dependencies are inferred from the claim text.