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公开(公告)号：HK138694A
公开(公告)日：1994-12-16
申请号：HK138694
申请日：1994-12-08
Applicant: IBM
Inventor： WORKMAN MICHAEL LEE
Abstract: A digital servo control system for a data recording disk file receives as input a digital head position error signal (PES) and a digital signal corresponding to the head actuator input signal, and outputs a digital control signal. The control signal is integrated and amplified to provide the input signal to the actuator. The control signal is calculated from estimated values of absolute head position, head velocity and the equivalent actuator input signal required to compensate for constant or very low frequency bias forces. The estimated values are functions of respective predicted values, which in turn are functions of, among other things, constants representing the digital sampling time and physical parameters of the actuator. The updating of the estimated values from the respective predicted values is made with the use of an error term, which is the error between the measured absolute head position and the predicted absolute head position. The predicted absolute head position is made sufficiently accurate, that the error term is always less than a selected number of tracks. This permits the digital servo control system to operate during track seeking without counting track crossings so that the system is operable with servo information recorded either in sectors on a data disk or in continuous tracks on a dedicated servo disk.
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公开(公告)号：DE3375674D1
公开(公告)日：1988-03-17
申请号：DE3375674
申请日：1983-10-05
Applicant: IBM
Inventor： WORKMAN MICHAEL LEE
Abstract: A servo system generates a velocity profile for moving a load from one position to another by dividing the time during which the load is moving into a plurality of segments, each segment being one half as long as the preceding segment. For each segment a fixed number of desired velocity values are stored and used to control the velocity of the moving load. This results in increasing resolution of the velocity wave as the load approaches its desired position, while not requiring excessive storage capacity for storing the desired velocity values.
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公开(公告)号：DE69318605D1
公开(公告)日：1998-06-25
申请号：DE69318605
申请日：1993-03-02
Applicant: IBM
Inventor： HATCHETT MICHAEL ROBERT , HEATH JOHN STEWART , LEE HUBERT CHEW , ROW EUN KYOUNG , SPENCER ROGER DALE , WORKMAN MICHAEL LEE
Abstract: A multiple disk drive assembly (10) in a 5 1/4 inch disk drive form factor having two 3 1/2 inch disk drive form factor head-disk assemblies (HDA) (11, 13) internally mounted on a rigid frame (15) and accessible via a common industry-standard interface connector (55) is provided. Both the interface and power connectors (55 and 53 respectively) and the frame mounting hole patterns are industry standard to provide interchangeability with 5 1/4 inch form factor disk drives provided by manufacturers for use in computer systems. A single electronics controller board (17) is shared by both HDAs and is mounted on the bottom side of the frame below the HDAs. The controller board may implement SCSI or IPI interfaces in either differential or single-ended versions. A spring vibration damper (47) is utilized to minimize external vibration and shock effects on the HDAs and also to minimize the effects of vibration internally generated by one HDA on the adjacent HDA. The assembly is fully enclosed with metal top and bottom covers (19 and 21 respectively) to provide separate enclosures for the HDAs and the controller board cooling and to provide EMC and RFI protection.
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公开(公告)号：SG44367A1
公开(公告)日：1997-12-19
申请号：SG1995002341
申请日：1993-03-02
Applicant: IBM
Inventor： HATCHETT MICHAEL , HEATH JOHN STEWART , LEE HUBERT CHEW , ROW EUN KYOUNG , SPENCER ROGER DALE , WORKMAN MICHAEL LEE
Abstract: A multiple disk drive assembly (10) in a 5 1/4 inch disk drive form factor having two 3 1/2 inch disk drive form factor head-disk assemblies (HDA) (11, 13) internally mounted on a rigid frame (15) and accessible via a common industry-standard interface connector (55) is provided. Both the interface and power connectors (55 and 53 respectively) and the frame mounting hole patterns are industry standard to provide interchangeability with 5 1/4 inch form factor disk drives provided by manufacturers for use in computer systems. A single electronics controller board (17) is shared by both HDAs and is mounted on the bottom side of the frame below the HDAs. The controller board may implement SCSI or IPI interfaces in either differential or single-ended versions. A spring vibration damper (47) is utilized to minimize external vibration and shock effects on the HDAs and also to minimize the effects of vibration internally generated by one HDA on the adjacent HDA. The assembly is fully enclosed with metal top and bottom covers (19 and 21 respectively) to provide separate enclosures for the HDAs and the controller board cooling and to provide EMC and RFI protection.
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公开(公告)号：DE3782448D1
公开(公告)日：1992-12-10
申请号：DE3782448
申请日：1987-04-16
Applicant: IBM
Inventor： WORKMAN MICHAEL LEE
Abstract: A digital servo control system for a data recording disk file receives as input a digital head position error signal (PES) and a digital signal corresponding to the head actuator input signal, and outputs a digital control signal. The control signal is integrated and amplified to provide the input signal to the actuator. The control signal is calculated from estimated values of absolute head position, head velocity and the equivalent actuator input signal required to compensate for constant or very low frequency bias forces. The estimated values are functions of respective predicted values, which in turn are functions of, among other things, constants representing the digital sampling time and physical parameters of the actuator. The updating of the estimated values from the respective predicted values is made with the use of an error term, which is the error between the measured absolute head position and the predicted absolute head position. The predicted absolute head position is made sufficiently accurate, that the error term is always less than a selected number of tracks. This permits the digital servo control system to operate during track seeking without counting track crossings so that the system is operable with servo information recorded either in sectors on a data disk or in continuous tracks on a dedicated servo disk.
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Patent Agency Ranking
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
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.
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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
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.
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公开(公告)号：SG147694G
公开(公告)日：1995-03-17
申请号：SG147694
申请日：1994-10-13
Applicant: IBM
Inventor： WORKMAN MICHAEL LEE
Abstract: A digital servo control system for a data recording disk file receives as input a digital head position error signal (PES) and a digital signal corresponding to the head actuator input signal, and outputs a digital control signal. The control signal is integrated and amplified to provide the input signal to the actuator. The control signal is calculated from estimated values of absolute head position, head velocity and the equivalent actuator input signal required to compensate for constant or very low frequency bias forces. The estimated values are functions of respective predicted values, which in turn are functions of, among other things, constants representing the digital sampling time and physical parameters of the actuator. The updating of the estimated values from the respective predicted values is made with the use of an error term, which is the error between the measured absolute head position and the predicted absolute head position. The predicted absolute head position is made sufficiently accurate, that the error term is always less than a selected number of tracks. This permits the digital servo control system to operate during track seeking without counting track crossings so that the system is operable with servo information recorded either in sectors on a data disk or in continuous tracks on a dedicated servo disk.
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公开(公告)号：DE3375852D1
公开(公告)日：1988-04-07
申请号：DE3375852
申请日：1983-10-17
Applicant: IBM
Inventor： STEPHENS HAROLD CLARK , WORKMAN MICHAEL LEE
Abstract: A servo system for a magnetic disk file having a voice coil motor (VCM) actuator generates a position error signal (PES) from servo information recorded on one of the disks. An electrical model of the VCM is employed through which a measure of the VCM electrical current is passed to generate a simulated PES signal which is continuous even if the regular PES is sampled or intermittent.
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公开(公告)号：DE69318605T2
公开(公告)日：1999-02-04
申请号：DE69318605
申请日：1993-03-02
Applicant: IBM
Inventor： HATCHETT MICHAEL ROBERT , HEATH JOHN STEWART , LEE HUBERT CHEW , ROW EUN KYOUNG , SPENCER ROGER DALE , WORKMAN MICHAEL LEE
Abstract: A multiple disk drive assembly (10) in a 5 1/4 inch disk drive form factor having two 3 1/2 inch disk drive form factor head-disk assemblies (HDA) (11, 13) internally mounted on a rigid frame (15) and accessible via a common industry-standard interface connector (55) is provided. Both the interface and power connectors (55 and 53 respectively) and the frame mounting hole patterns are industry standard to provide interchangeability with 5 1/4 inch form factor disk drives provided by manufacturers for use in computer systems. A single electronics controller board (17) is shared by both HDAs and is mounted on the bottom side of the frame below the HDAs. The controller board may implement SCSI or IPI interfaces in either differential or single-ended versions. A spring vibration damper (47) is utilized to minimize external vibration and shock effects on the HDAs and also to minimize the effects of vibration internally generated by one HDA on the adjacent HDA. The assembly is fully enclosed with metal top and bottom covers (19 and 21 respectively) to provide separate enclosures for the HDAs and the controller board cooling and to provide EMC and RFI protection.
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