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公开(公告)号：JP2001005501A
公开(公告)日：2001-01-12
申请号：JP2000127198
申请日：2000-04-27
Applicant: IBM
Inventor： GREGORY MICHAEL FREEZE , LOUIS JOSEPH SERRANO
IPC: G11B21/08 , G05B11/36 , G05B13/02 , G05D3/12 , G11B5/55 , G11B5/596 , G11B21/10 , G11B19/04 , G11B19/14
Abstract: PROBLEM TO BE SOLVED: To improve the control over a read/write head positioning means under a temperature varying condition by making a system include a control loop which is coupled with a 2nd member and generates a wide-band frequency signal for positioning the 2nd member at a desirable position relatively to a 1st member. SOLUTION: A position controller 30 applies a wide-band frequency control current of a 1st polarity to the 1st member (motor) 14 to make the 2nd member (read/write head) 18 start moving from a position on a track 20 to a position on a track 22. When the read/write head 18 approaches the track 22, a control current of the opposite polarity is applied to the motor 14. The position controller 30 is equipped with temperature input 36 for inputting a signal corresponding to the actual temperature of a disk drive constitution element. This signal varies the frequency of a notch filter to match with the natural resonance frequency(f) corresponding to specific temperature of a device 10. The notch filter removes the natural resonance frequency(f).
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公开(公告)号：SG91860A1
公开(公告)日：2002-10-15
申请号：SG200002010
申请日：2000-04-10
Applicant: IBM
Inventor： JEFFREY JOSEPH DOBBEK , BRYAN SCOTT ROWAN , LOUIS JOSEPH SERRANO , MANTLE MAN-HON YU
Abstract: Method and system aspects for controlling spindle motor speed during head loading in a disk drive are described. The aspects include inputting a time-varying reference velocity profile signal, and selecting a controller to control spindle motor speed. Further included is feeding forward control signals sufficient to precompensate for drag during a head loading event and maintain spindle motor speed within an operating tolerance.
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