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1. 发明授权

US07031100B2 Motor torque constant variation compensation 失效
标题翻译：电机转矩恒定变化补偿
公开(公告)号：US07031100B2
公开(公告)日：2006-04-18
申请号：US10323130
申请日：2002-12-18
申请人： Jeffrey D. Andress , Philip R. Woods , Ryan Todd Lyle
发明人： Jeffrey D. Andress , Philip R. Woods , Ryan Todd Lyle
IPC分类号： G11B5/596
CPC分类号： G11B5/5521
摘要： Method and apparatus for compensating for a decrease in the torque constant of an actuator motor in a data storage device. An actuator supports the head adjacent a data recording surface on which a plurality of tracks are defined. A servo circuit outputs current to the actuator motor to carry out a seek to move the head from an initial track to a destination track in accordance with a velocity profile having a nominal deceleration trajectory along which the head is decelerated to reach the destination track. The servo circuit operates to adjust an initial value of gain to a second value in response to a selected parameter, and scales the nominal deceleration trajectory to a derated deceleration trajectory in relation to the second value of the gain. The derated deceleration trajectory is preferably selected in relation to the difference between the second value of gain and a predetermined threshold.
摘要翻译：用于补偿数据存储装置中的致动器电动机的转矩常数降低的方法和装置。执行器支持与其上定义多个轨道的数据记录表面相邻的头部。伺服电路将电流输出到致动器电动机，以根据具有标称减速轨迹的速度分布，将磁头从初始轨道移动到目标磁道，以使磁头减速到达目标磁道。伺服电路用于响应于所选择的参数来将增益的初始值调整到第二值，并将标称减速轨迹相对于增益的第二值进行缩放减速轨迹。优选地，相对于增益的第二值与预定阈值之间的差异来选择降额减速轨迹。

2. 发明授权

US5777816A Data track following method for disc drives 失效
标题翻译：磁盘驱动器的数据跟踪方法
公开(公告)号：US5777816A
公开(公告)日：1998-07-07
申请号：US60858
申请日：1993-05-12
申请人： Randall D. Hampshire , Philip R. Woods
发明人： Randall D. Hampshire , Philip R. Woods
IPC分类号： G11B5/55 , G11B5/596 , G11B21/10
CPC分类号： G11B5/5534 , G11B21/106 , G11B5/5565 , G11B5/59627 , G11B5/59644
摘要： A method for following a selected data track on a selected data surface of a disc drive of the type having a dedicated servo system in which guiding of data heads to follow data tracks on data surfaces is effected by positioning an actuator upon which the data heads are mounted in relation to the location of a servo head, also mounted on the actuator, with respect to servo tracks on a dedicated servo surface. The data tracks are organized into cylinders, each containing a servo track, and a selected data track is accessed by seeking to an optimum servo track displaced from the servo track in the cylinder containing the data track by an integral number of track spacings selected to compensate for misalignments greater than a track spacing between the data and servo heads. Data track following is then effected by offsetting the servo head from the optimum servo track to compensate for misalignments of less than a track spacing between the data and servo heads and tracks.
摘要翻译：一种用于跟踪具有专用伺服系统的盘式驱动器的选定数据表面上的选定数据轨迹的方法，其中数据头在数据表面上跟随数据轨道的引导通过将数据头位于其上的致动器安装在相对于专用伺服表面上的伺服磁道上安装在致动器上的伺服磁头的位置。数据轨道被组织成气缸，每个气缸都包含一个伺服轨道，并且通过寻求从包含数据轨道的气缸中的伺服轨道偏移的最佳伺服轨迹来访问所选择的数据磁道，该磁道选定为补偿的整数个磁道间隔对于大于数据和伺服头之间的磁道间隔的未对准。然后通过将伺服磁头从最佳伺服磁道偏移来补偿数据磁道跟随，以补偿数据与伺服磁头和磁道之间小于磁道间隔的不对准。

3. 发明授权

US5774297A Dynamic compensation of servo burst measurement offsets in a disc drive 失效
标题翻译：磁盘驱动器中伺服突发测量偏移的动态补偿
公开(公告)号：US5774297A
公开(公告)日：1998-06-30
申请号：US621659
申请日：1996-03-26
申请人： Randall D. Hampshire , Lealon R. McKenzie , Philip R. Woods , Clyde E. Goodner, III
发明人： Randall D. Hampshire , Lealon R. McKenzie , Philip R. Woods , Clyde E. Goodner, III
IPC分类号： G11B5/596 , G11B21/08
CPC分类号： G11B21/085 , G11B5/59627 , G11B5/59688
摘要： Method and apparatus for dynamically compensating for servo burst measurement offsets in a disc drive. A first type of servo position error signal is used during a compensation routine to position a head adjacent a selected track on a disc, the first type of servo position error signal determined from servo burst signals read by the head from servo position fields on the disc. A second type of servo position error signal is also generated from the servo burst signals and the difference between selected values of the second type of servo position error signal is compared to an acceptance limit. Compensation terms are incrementally added to the servo burst signals used to generate the second type of servo position error signal until the difference is below the acceptance limits. Thereafter, the compensation terms are stored and retrieved during normal track following operations to generate a compensated servo position error signal.
摘要翻译：用于动态补偿磁盘驱动器中的伺服突发测量偏移的方法和装置。在补偿程序期间，使用第一类伺服位置误差信号来将磁头定位在与磁盘上的所选磁道相邻的磁头上，第一类型的伺服位置误差信号由磁头从磁盘上的伺服位置字段读取的伺服脉冲串信号确定。还从伺服脉冲串信号产生第二类伺服位置误差信号，并将第二类伺服位置误差信号的选择值之差与接受极限进行比较。补偿项逐渐增加到用于产生第二类伺服位置误差信号的伺服脉冲串信号，直到差值低于接受极限。此后，在正常跟踪操作期间存储和检索补偿项以产生经补偿的伺服位置误差信号。

4. 发明授权

US5262907A Hard disc drive with improved servo system 失效
标题翻译：具有改进伺服系统的硬盘驱动器
公开(公告)号：US5262907A
公开(公告)日：1993-11-16
申请号：US738053
申请日：1991-07-31
申请人： Dennis D. Duffy , Lealon R. McKenzie , Fereidoon Heydari , Philip R. Woods
发明人： Dennis D. Duffy , Lealon R. McKenzie , Fereidoon Heydari , Philip R. Woods
IPC分类号： G11B21/10 , G11B5/55 , G11B5/56 , G11B5/596 , G11B5/82
CPC分类号： G11B5/556
摘要： A hard disc drive having a digital servo system for controlling the position of a servo head on a dedicated servo surface. The servo surface is formatted in a series of consecutive frames along concentric tracks, each frame passing the servo head in a time that defines a sampling interval for the servo system. The frames contain track address and position fields for locating the servo head and location can be effected in relation to limited or extended fine control regions about the tracks via signals transmitted to a position circuit utilized to generate a servo position error from the position field. The position circuit generates a track phase code for checking track addresses generated by a track address circuit used to generate a track address from the address field. Servo routines are carried out by a servo microcomputer using control equations, stored in the servo microcomputer, having coefficients stored in a system microcomputer that transmits the coefficients with command to carry out servo operations. Writing of data to data tracks is disabled when an effective head to track distance, defined in relation to actual distance and head speed exceeds an on track threshold.

5. 发明授权

US06456452B1 Feed forward compensation for repeatable head position error in a disc drive 失效
标题翻译：前馈补偿用于磁盘驱动器中可重复的磁头位置错误
公开(公告)号：US06456452B1
公开(公告)日：2002-09-24
申请号：US08522839
申请日：1995-09-01
申请人： Daniel E. Hobson , Philip R. Woods
发明人： Daniel E. Hobson , Philip R. Woods
IPC分类号： G11B5596
CPC分类号： G11B5/59627
摘要： Method and apparatus for reducing repeatable runout signals in a servo position error (SPE) signal of a disc drive actuator. During track following, a measurement estimate is obtained through the sampling and accumulating of data from the SPE over a mechanical revolution of the drive, the measurement estimate providing a characterization of the repeatable runout signal in the servo position error signal. A correction estimate is updated by the measurement estimate, and the correction estimate is added to the servo position error signal to provide an adjusted servo position error signal. The disc drive uses the adjusted servo position error signal to generate a correction signal for adjusting the position of the actuator. The measurement estimate is reset after each update of the correction estimate and a new measurement estimate is generated during each subsequent rotation of the disc drive during track following mode.
摘要翻译：用于在盘驱动致动器的伺服位置误差（SPE）信号中减少可重复跳动信号的方法和装置。在轨道跟踪期间，通过在驱动器的机械转动中从SPE采集和累积数据来获得测量估计，测量估计提供伺服位置误差信号中的可重复跳动信号的表征。通过测量估计更新校正估计，并且将校正估计值加到伺服位置误差信号上，以提供经调整的伺服位置误差信号。盘驱动器使用经调整的伺服位置误差信号来产生用于调节致动器位置的校正信号。在校正估计的每次更新之后，测量估计被重置，并且在跟踪跟踪模式期间在盘驱动器的每个后续旋转期间产生新的测量估计。

6. 发明授权

US6061201A Method of measuring the read-to-write offset in a disc drive having separate read and write elements 失效
标题翻译：测量具有单独的读和写元件的磁盘驱动器中的读/写偏移量的方法
公开(公告)号：US6061201A
公开(公告)日：2000-05-09
申请号：US192638
申请日：1994-02-07
申请人： Philip R. Woods
发明人： Philip R. Woods
IPC分类号： G11B5/596
CPC分类号： G11B5/59633
摘要： A method of measuring the read-to-write offset of a track in a disc drive system having separate read and write elements measures the amplitude of a test signal across the width if a track. A test pattern is written to the track at a predetermined actuator offset, which will typically be zero. Next, the read element is incrementally moved across the width of the track to measure a maximum amplitude in the read signal from the read element. After the maximum amplitude has been determined, the read element is incrementally moved across the width of the track to find first and second actuator offset positions where the read signal has an amplitude approximately equal to a predetermined percentage of the maximum amplitude. A midpoint is calculated between the first and second actuator offset positions, and the read-to-write offset is equal to the difference between the midpoint and the predetermined actuator offset.
摘要翻译：在具有单独的读取和写入元件的盘驱动器系统中测量轨道的读/写偏移量的方法如果是轨道则测量穿过该宽度的测试信号的幅度。在预定的执行器偏移量处将测试图案写入轨道，通常为零。接下来，读取元件在轨道的宽度上递增地移动，以测量来自读取元件的读取信号中的最大幅度。在确定了最大幅度之后，读取元件在轨道的宽度上递增地移动，以找到第一和第二致动器偏移位置，其中读取信号的幅度近似等于最大幅度的预定百分比。在第一和第二致动器偏移位置之间计算中点，并且读/写偏移等于中点和预定致动器偏移之间的差。

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