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公开(公告)号：EP0108060A4
公开(公告)日：1985-11-07
申请号：EP82902023
申请日：1982-05-17
Applicant: IBM
Inventor： AXMEAR FREDERICK EUGENE , BAXTER DUANE WILLARD , SAXMAN JOHN HUMPHREY , SIVERLING MICHAEL MCHUGH
CPC classification number: G11B5/5547 , G11B21/083
Abstract: A sector servo seek control samples each sector to obtain sector time, the track identification within a sequence of track types and a position error signal for a track location to track location seek. The device during each sector determines the actual transducer track location and the next sector projected track location with respect to the sequence of track types. The projected track location is corrected using the error signal to find the actual location, but if a sector signal is missing or erroneous, the projected location is used as the actual location, permitting a composite correction to be made when a correct sector signal is obtained. The seek time is minimized by using maximum acceleration followed by maximum deceleration while not exceeding a velocity value that would cause the device to overshoot the target track using full deceleration.
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公开(公告)号：DE3280376D1
公开(公告)日：1992-01-02
申请号：DE3280376
申请日：1982-05-17
Applicant: IBM
Inventor： AXMEAR FREDERICK EUGENE , BAXTER DUANE WILLARD , SAXMAN JOHN HUMPHREY , SIVERLING MICHAEL MCHUGH
Abstract: An analog position error signal is digitised and latched. If a signal occurs on missing sector line, the output of selection circuit goes to five zero bits and error correction is prevented. The lost sector projected position, latched during the previous cycle register is truncated and rounded to an integer indicating the track type by a circuit. The select circuit also responds to the missing sector signal to select the last sector projected position from the bus. The selection circuit outputs are summed and an actual position signal is put on a bus. A circuit subtracts the last position stored from the bus position, to derive a valve representing velocity in the sector, which is latched. The velocity is then used to compute a projected location which is put onto a bus and loaded into the output register of the projected track psotion circuit. In this way, on error condition can be allowd for several sector times before the condition is reached where the next sector signal can not restore the correct actual position.
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