公开(公告)号：DE3881314T2

公开(公告)日：1993-12-02

申请号：DE3881314

申请日：1988-08-16

Applicant: IBM

Inventor： SHIH SHIH-MING ,  SPANEL RICHARD JAMES ,  YAMAMOTO KENNETH GREGORY ,  YU MAN-HON MANTLE

IPC: G11B21/08 ,  G11B21/10

Abstract: A single processor in a disk file digital servo control system generates a head actuator control signal at two different rates, depending on whether the read/write head is being moved between data tracks or is following a specific track. A sampling clock generator (65) receives servo timing information from a recorded servo disk surface (22) and generates interrupt signals to the processor at predetermined frequencies selected by the time required for the processor to run the algorithm which generates the control signals. Upon receipt of a seek command to move the head to a target track, or a predetermined head position error signal indicative of arrival of the head to the target track, the microprocessor enables or disables appropriate interrupts so as to select one of the appropriate rates for generating the control signals. The digital servo control system thus allows servo position information to be sampled at a higher frequency during track following.

公开(公告)号：DE3855647T2

公开(公告)日：1997-05-07

申请号：DE3855647

申请日：1988-08-16

Applicant: IBM

Inventor： EDEL STEPHEN F ,  WORKMAN MICHAEL LEE ,  YAMAMOTO KENNETH GREGORY ,  YU MANTLE MAN-HON

IPC: G11B21/08 ,  G11B21/10

Abstract: A data recording disk file with a voice coil motor (VCM) actuator (40) and a digital servo control system for positioning the read/write heads (30, 32, 34, 36) to selected concentric data tracks includes means for calculating the factor relating acceleration of the heads (30, 32, 34, 36) to VCM input current. This permits each disk file to compensate for any variation in the nominal VCM physical parameters, thus enabling VCMs to be manufactured to less demanding tolerances. The disk file also calculates a unique acceleration factor for each head position during movement of the heads (30, 32, 34, 36) from one track to another, thereby improving the arrival time of the heads (30, 32, 34, 36) to the target track. During an initialization procedure, the disk file performs a track seek, during which VCM current and head velocity information are acquired and used by the microprocessor (80) in the digital servo control system to calculate a value representing an average actual acceleration factor unique to that disk file. This value, together with predetermined constants representing the characteristic relationship of acceleration factor to head position in a disk file with a nominal VCM, are used by the microprocessor (80) to calculate the actual acceleration factor for each head position during a track seek.

公开(公告)号：DE3855647D1

公开(公告)日：1996-12-12

申请号：DE3855647

申请日：1988-08-16

Applicant: IBM

Inventor： EDEL STEPHEN F ,  WORKMAN MICHAEL LEE ,  YAMAMOTO KENNETH GREGORY ,  YU MANTLE MAN-HON

IPC: G11B21/08 ,  G11B21/10

Abstract: A data recording disk file with a voice coil motor (VCM) actuator (40) and a digital servo control system for positioning the read/write heads (30, 32, 34, 36) to selected concentric data tracks includes means for calculating the factor relating acceleration of the heads (30, 32, 34, 36) to VCM input current. This permits each disk file to compensate for any variation in the nominal VCM physical parameters, thus enabling VCMs to be manufactured to less demanding tolerances. The disk file also calculates a unique acceleration factor for each head position during movement of the heads (30, 32, 34, 36) from one track to another, thereby improving the arrival time of the heads (30, 32, 34, 36) to the target track. During an initialization procedure, the disk file performs a track seek, during which VCM current and head velocity information are acquired and used by the microprocessor (80) in the digital servo control system to calculate a value representing an average actual acceleration factor unique to that disk file. This value, together with predetermined constants representing the characteristic relationship of acceleration factor to head position in a disk file with a nominal VCM, are used by the microprocessor (80) to calculate the actual acceleration factor for each head position during a track seek.

公开(公告)号：DE3881314D1

公开(公告)日：1993-07-01

申请号：DE3881314

申请日：1988-08-16

Applicant: IBM

Inventor： SHIH SHIH-MING ,  SPANEL RICHARD JAMES ,  YAMAMOTO KENNETH GREGORY ,  YU MAN-HON MANTLE

IPC: G11B21/08 ,  G11B21/10

Abstract: A single processor in a disk file digital servo control system generates a head actuator control signal at two different rates, depending on whether the read/write head is being moved between data tracks or is following a specific track. A sampling clock generator (65) receives servo timing information from a recorded servo disk surface (22) and generates interrupt signals to the processor at predetermined frequencies selected by the time required for the processor to run the algorithm which generates the control signals. Upon receipt of a seek command to move the head to a target track, or a predetermined head position error signal indicative of arrival of the head to the target track, the microprocessor enables or disables appropriate interrupts so as to select one of the appropriate rates for generating the control signals. The digital servo control system thus allows servo position information to be sampled at a higher frequency during track following.