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公开(公告)号：JP2000339821A
公开(公告)日：2000-12-08
申请号：JP2000122996
申请日：2000-04-24
Applicant: IBM
Inventor： JEFFREY JOSEPH DOBEC , ROWAN BRYAN SCOTT , LEWIS JOSEPH SERRANO , MANTORU MAN HON YUU
Abstract: PROBLEM TO BE SOLVED: To reduce latent possibility of delay in a servo control loop at the time of achieving an appropriate spindle speed by compensating previously drag effect in head loading from a lamp position of a disk drive. SOLUTION: A feed forward control device 30 including a control loop is provided in a form of firmware, drag variation during head loading operation is decided, appropriate control is applied to a spindle motor 16 using expected drag variation, and drag variation is previously compensated. That is, expected drag variation follows the prescribed variation generated by the prescribed servo mechanism system. The control device 30 compensates previously expected drag variation, and provides a feed forward control signal generating a control output signal converted by a D/A 12 to a motor pre-driver 14 by combining with an output signal of a control device of a digital control device 32. Therefore, control in which the speed of the spindle motor 16 is limited in a specified tolerable range is performed during head load process.
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公开(公告)号：DE10020092A1
公开(公告)日：2001-03-01
申请号：DE10020092
申请日：2000-04-22
Applicant: IBM
Inventor： DOBBEK JEFFREY JOSEPH , ROWAN BRYAN SCOTT , SERRANO LOUIS JOSEPH , YU MANTIE MAN-HON
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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公开(公告)号：SG55407A1
公开(公告)日：1998-12-21
申请号：SG1997003943
申请日：1997-11-03
Applicant: IBM
Inventor： ROWAN BRYAN SCOTT , YU MANTLE MAN-HON
Abstract: An apparatus and method for reducing spindle power and acoustic noise in a self-commutating brushless d.c. motor for a disk drive adjusts the commutation angle of the motor until a point of optimum power consumption is reached. In a preferred approach implemented during disk drive operation, a direction in which to change the commutation angle is determined such that spindle power consumption is decreased. The commutation angle is the changed in the determined direction until a point of minimum spindle power consumption is identified. In order to determine the correct direction of commutation angle change, the commutation angle is varied in a first direction for so long as the spindle power consumption is decreasing. If varying the commutation angle of the motor in the first direction results in an increase in spindle power consumption, the commutation angle of the motor is varied in a second direction. During drive operation, the commutation angle may be varied back and forth in order to maintain the point of minimum spindle power consumption. The apparatus and method also minimizes torque ripple by determining a drive torque profile and storing that profile in memory as a table of torque constant values indexed to the rotational position of the disk. As the disk spins, its rotational position is sensed and the drive current is adjusted using a corresponding torque constant value. In this way, the drive current is varied inversely to the torque profile so as to produce a substantially uniform torque output, or a torque output that additionally compensates for structural resonance or other drive properties. Still further, a current offset value may be applied that is proportional to the difference between the torque profile and the average torque.
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