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1. 发明申请

US20130120873A1 DISK DRIVE UPSAMPLING SERVO CONTROL SIGNAL 有权
标题翻译：磁盘驱动器UPS控制伺服控制信号
公开(公告)号：US20130120873A1
公开(公告)日：2013-05-16
申请号：US13298133
申请日：2011-11-16
申请人： YANAN HUANG , ALEXANDER BABINSKI , DUC T. PHAN , ASWARTHA NARAYANA
发明人： YANAN HUANG , ALEXANDER BABINSKI , DUC T. PHAN , ASWARTHA NARAYANA
IPC分类号： G11B21/02 , G11B5/55
CPC分类号： G11B5/5547 , G11B5/596
摘要： A disk drive is disclosed comprising a disk including a plurality of servo tracks, wherein each servo track comprises a plurality of servo sectors. The disk drive further comprises an actuator for actuating a head over the disk in response to an actuator control signal. The servo sectors are read to generate a first sequence of control samples x[k] at a sample rate corresponding to a frequency of the servo sectors. The first sequence of control samples x[k] is upsampled by a factor of N to generate a second sequence of control samples y[ki] according to: y  [ k i  | i = 1 : N ] = ( 1 - i N - γ )  u  [ k - 1 ] + ( i N + γ )  u  [ k ] where γ is a scalar greater than or equal to zero and less than one. The actuator control signal is generated in response to the second sequence of control samples y[ki].
摘要翻译：公开了一种盘驱动器，其包括包括多个伺服轨道的盘，其中每个伺服轨道包括多个伺服扇区。磁盘驱动器还包括用于响应于致动器控制信号而将磁头驱动到磁盘上的致动器。读取伺服扇区，以对应于伺服扇区的频率的采样率产生第一控制样本序列x [k]。控制样本x [k]的第一序列由N因子进行上采样，以根据以下方式生成第二控制样本序列：y [ki] i = 1：N] =（1-i N-gamma）u [k-1] +（i N + gamma）u [k]其中γ是标量大于或等于零且小于一。致动器控制信号响应于控制样本的第二序列y i而被产生。

2. 发明授权

US08179626B1 Adaptive shock detection 有权
标题翻译：自适应冲击检测
公开(公告)号：US08179626B1
公开(公告)日：2012-05-15
申请号：US12631716
申请日：2009-12-04
申请人： Robert P. Ryan , Don Brunnett , Alain Chahwan , Duc T. Phan
发明人： Robert P. Ryan , Don Brunnett , Alain Chahwan , Duc T. Phan
IPC分类号： G11B27/36
CPC分类号： G11B5/5582 , G11B19/042
摘要： Adaptive shock detection systems are provided according to various embodiments of the present invention. In one embodiment, an adaptive shock detection system comprises a shock sensing circuit, and a controller configured to receive shock detection signals from the shock sensing circuit and to dynamically adjust a sensitivity of the shock sensing circuit based the received shock detection signals.
摘要翻译：根据本发明的各种实施例提供自适应冲击检测系统。在一个实施例中，自适应冲击检测系统包括冲击检测电路和被配置为从冲击感测电路接收冲击检测信号并且基于所接收的冲击检测信号动态地调整冲击感测电路的灵敏度的控制器。

3. 发明授权

US07961422B1 Disk drive computing data center off-track from repeatable runout of write servo track and read servo track 有权
标题翻译：磁盘驱动器计算数据中心从写入伺服轨迹和读取伺服轨迹的可重复跳动偏离轨迹
公开(公告)号：US07961422B1
公开(公告)日：2011-06-14
申请号：US12388644
申请日：2009-02-19
申请人： Min Chen , Li Yi , Duc T. Phan
发明人： Min Chen , Li Yi , Duc T. Phan
IPC分类号： G11B5/596
CPC分类号： G11B5/59627
摘要： A disk drive is disclosed comprising a disk having a plurality of servo tracks that define a plurality of data tracks, and a head actuated over the disk by a voice coil motor (VCM), wherein the head comprises a read element offset radially from a write element. The read element is positioned over a first servo track and the write element is positioned over a second servo track, and a first repeatable runout (RRO) of the first servo track is measured. The read element is positioned over the second servo track, and a second RRO of the second servo track is measured. A data center off-track is computed in response to the first RRO and the second RRO.
摘要翻译：公开了一种磁盘驱动器，其包括具有限定多个数据磁道的多个伺服磁道的盘，以及由音圈电机（VCM）在盘上驱动的磁头，其中磁头包括从写入放射偏离的读取元件元件。读取元件位于第一伺服轨道之上，并且写入元件位于第二伺服轨道上，并且测量第一伺服轨道的第一可重复跳动（RRO）。读取元件位于第二伺服轨道上，并且测量第二伺服轨道的第二RRO。响应于第一RRO和第二RRO计算数据中心离轨。

4. 发明授权

US5696647A Method for carrying out seeks in a hard disc drive to limit the generation of acoustic noise including using a slew rate limit 失效
标题翻译：用于在硬盘驱动器中进行搜索以限制包括使用压摆率限制的声音噪声的产生的方法
公开(公告)号：US5696647A
公开(公告)日：1997-12-09
申请号：US218607
申请日：1994-03-28
申请人： Duc T. Phan , Mark A. Pajdowski
发明人： Duc T. Phan , Mark A. Pajdowski
IPC分类号： G11B5/55 , G11B21/08 , G11B33/08 , G11B5/596
CPC分类号： G11B21/083 , G11B5/5547 , G11B33/08
摘要： A method for carrying out seeks of a transducer between tracks of a disc drive to limit acoustic noise arising from changes in the acceleration of the actuator which supports the transducer. The rate of change of the acceleration is limited utilizing three techniques: limitation of changes in the control signal outputted to an actuator driver that supplies an electrical current to the actuator that gives rise to a torque on the actuator to a preselected slew rate limit, averaging the control signal in successive repetitions of the generation of the control signal and outputting the averaged control signal during an initial portion of the time for the repetition while outputting the control signal determined in the repetition for the remainder of the time for the repetition, and determining a component of the control signal in relation to the difference between the radial velocity of the transducer and a profile velocity determined in relation to the smaller of the distance remaining in the seek and a deceleration distance determined by multiplying the length of the seek by a predetermined factor selected to cause the transducer to coast at substantially constant speed between acceleration and subsequent deceleration of the transducer.
摘要翻译：一种用于在盘驱动器的轨道之间执行换能器的寻找以限制由支撑换能器的致动器的加速度变化引起的声音噪声的方法。利用三种技术来限制加速度的变化率：输出到致动器驱动器的控制信号的变化的限制，致动器驱动器向致动器提供电流，从而将致动器上的转矩提高到预选的转换速率极限，平均所述控制信号在连续重复所述控制信号的产生中，并且在所述重复的时间的初始部分期间输出所述平均的控制信号，同时输出在所述重复中确定的所述重复的剩余时间中确定的控制信号，并且确定控制信号的分量相对于换能器的径向速度与相对于搜索中剩余的距离中的较小者确定的轮廓速度之间的差异以及通过将搜索的长度乘以预定的距离而确定的减速距离因子选择使传感器以基本恒定的速度行驶换能器的加速度和随后的减速度。

5. 发明授权

US5566095A Fast calibration using microsteps 失效
公开(公告)号：US5566095A
公开(公告)日：1996-10-15
申请号：US483473
申请日：1995-06-07
申请人： T. Jay Cameron , Duc T. Phan
发明人： T. Jay Cameron , Duc T. Phan
IPC分类号： G11B5/55 , G11B5/596
CPC分类号： G11B5/5534
摘要： A direct access storage device (DASD) employs a servo including a digital signal processor having a software switch (DSP). The DSP is provided with DSP code in a DSP code space. One of the functions of the DSP code is to implement the microstep calibration of the present invention. Microstep calibration is accomplished by a step change of head position within a single track. In head position 1 the head is at the center of the track in track follow mode. From head position 2 to head position 3, an offset command causes the servo to move the head slightly off center. From head position 3 to head position 4, the servo is disabled by opening the software switch in the DSP. The position delta, delta 3-4, of the head is recorded. From position 4 to position 6, the servo is still disabled and a step of current is applied to the VCM to determine position delta 2. From position 7 to position 8, the servo is still disabled and two steps of VCM current are applied to recover to the offset position. From position 9 to position 10, the servo is enabled by operating the software switch within the DSP with the offset still applied and the result is that the offset position is re-established. Delta 3-4 and delta 4-6 are used to determine the system gain. The measured gain is applied to the DSP as a kgain parameter which is used by the DSP to correct for variation and measured system gain.

6. 发明授权

US08743495B1 Disk drive detecting track squeeze when circular tracks are defined from non-circular servo tracks 有权
标题翻译：当圆形轨道由非圆形伺服轨道定义时，磁盘驱动器检测轨道挤压
公开(公告)号：US08743495B1
公开(公告)日：2014-06-03
申请号：US13153357
申请日：2011-06-03
申请人： Min Chen , Duc T. Phan
发明人： Min Chen , Duc T. Phan
IPC分类号： G11B5/596
CPC分类号： G11B5/59627 , G11B20/10305
摘要： A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of non-circular servo tracks for defining a plurality of substantially circular tracks. Each non-circular servo track comprises a plurality of servo sectors defining a plurality of servo wedges. The head is positioned at a first offset relative to a first circular track and a relationship of servo bursts for each servo wedge is first generated. The head is positioned at a second offset relative to the first circular track and the relationship of the servo bursts for each servo wedge is second generated. For each servo wedge, a selection is made between the first generated relationship at the first offset and the second generated relationship at the second offset, and the servo bursts at the selected offset are evaluated to generate a track squeeze indicator.
摘要翻译：公开了一种磁盘驱动器，其包括在盘上致动的磁头，该磁头包括多个用于限定多个基本上圆形轨道的非圆形伺服磁道。每个非圆形伺服轨道包括限定多个伺服楔形的多个伺服扇区。头部相对于第一圆形轨道定位在第一偏移处，并且首先产生针对每个伺服楔的伺服脉冲串的关系。头部相对于第一圆形轨道定位在第二偏移处，并且第二次产生用于每个伺服楔块的伺服脉冲串的关系。对于每个伺服楔，在第一偏移处的第一生成关系和第二偏移处的第二生成关系之间进行选择，并且评估所选偏移处的伺服脉冲串以产生轨道挤压指示器。

7. 发明授权

US5760992A Method for carrying out seeks in a hard disc drive to limit the generation of acoustic noise 失效
公开(公告)号：US5760992A
公开(公告)日：1998-06-02
申请号：US656609
申请日：1996-05-31
申请人： Duc T. Phan , Mark A. Pajdowski
发明人： Duc T. Phan , Mark A. Pajdowski
IPC分类号： G11B5/55 , G11B21/08 , G11B33/08
CPC分类号： G11B21/083 , G11B5/5547 , G11B33/08
摘要： A method for carrying out seeks of a transducer between tracks of a disc drive to limit acoustic noise arising from changes in the acceleration of the actuator which supports the transducer. The rate of change of the acceleration is limited utilizing three techniques: limitation of changes in the control signal outputted to an actuator driver that supplies an electrical current to the actuator that gives rise to a torque on the actuator to a preselected slew rate limit, averaging the control signal in successive repetitions of the generation of the control signal and outputting the averaged control signal during an initial portion of the time for the repetition while outputting the control signal determined in the repetition for the remainder of the time for the repetition, and determining a component of the control signal in relation to the difference between the radial velocity of the transducer and a profile velocity determined in relation to the smaller of the distance remaining in the seek and a deceleration distance determined by multiplying the length of the seek by a predetermined factor selected to cause the transducer to coast at substantially constant speed between acceleration and subsequent deceleration of the transducer.

8. 发明授权

US5751513A Method for carrying out seeks in a hard disc drive to limit the generation of acoustic noise 失效
标题翻译：用于在硬盘驱动器中执行寻找以限制声音噪声的产生的方法
公开(公告)号：US5751513A
公开(公告)日：1998-05-12
申请号：US657689
申请日：1996-05-31
申请人： Duc T. Phan , Mark A. Pajdowski
发明人： Duc T. Phan , Mark A. Pajdowski
IPC分类号： G11B5/55 , G11B21/08 , G11B33/08
CPC分类号： G11B21/083 , G11B5/5547 , G11B33/08
摘要： A method for carrying out seeks of a transducer between tracks of a disc drive to limit acoustic noise arising from changes in the acceleration of the actuator which supports the transducer. The rate of change of the acceleration is limited utilizing three techniques: limitation of changes in the control signal outputted to an actuator driver that supplies an electrical current to the actuator that gives rise to a torque on the actuator to a preselected slew rate limit, averaging the control signal in successive repetitions of the generation of the control signal and outputting the averaged control signal during an initial portion of the time for the repetition while outputting the control signal determined in the repetition for the remainder of the time for the repetition, and determining a component of the control signal in relation to the difference between the radial velocity of the transducer and a profile velocity determined in relation to the smaller of the distance remaining in the seek and a deceleration distance determined by multiplying the length of the seek by a predetermined factor selected to cause the transducer to coast at substantially constant speed between acceleration and subsequent deceleration of the transducer.
摘要翻译：一种用于在盘驱动器的轨道之间执行换能器的寻找以限制由支撑换能器的致动器的加速度变化引起的声音噪声的方法。利用三种技术来限制加速度的变化率：输出到致动器驱动器的控制信号的变化的限制，致动器驱动器向致动器提供电流，从而将致动器上的转矩提高到预选的转换速率极限，平均所述控制信号在连续重复所述控制信号的产生中，并且在所述重复的时间的初始部分期间输出所述平均的控制信号，同时输出在所述重复中确定的所述重复的剩余时间中确定的控制信号，并且确定控制信号的分量相对于换能器的径向速度与相对于搜索中剩余的距离中的较小者确定的轮廓速度之间的差异以及通过将搜索的长度乘以预定的距离而确定的减速距离因子选择使传感器以基本恒定的速度行驶换能器的加速度和随后的减速度。

9. 发明授权

US08988811B1 Disk drive toggling VCM inductor compensation to reduce acoustic noise 有权
标题翻译：磁盘驱动器切换VCM电感补偿以减少声学噪声
公开(公告)号：US08988811B1
公开(公告)日：2015-03-24
申请号：US12126377
申请日：2008-05-23
申请人： Jianghong Ding , Duc T. Phan , Robert P. Ryan
发明人： Jianghong Ding , Duc T. Phan , Robert P. Ryan
IPC分类号： G11B5/55
CPC分类号： G11B5/5534 , G11B5/5547 , G11B5/5586
摘要： A disk drive is disclosed comprising a disk, and a voice coil motor (VCM) operable to rotate an actuator arm about a pivot to actuate a head radially over the disk. A voice coil voltage is measured across the voice coil, a velocity command of the VCM is set to substantially zero, an inductor compensation circuit is toggled at least once by enabling and disabling the inductor compensation circuit, the inductor compensation circuit is enabled, the velocity command of the VCM is adjusted, and a control signal is generated and applied to the voice coil in order to move the actuator arm, wherein the control signal is generated in response to the adjusted velocity command, the voice coil voltage, and the estimated inductance voltage.
摘要翻译：公开了一种磁盘驱动器，其包括磁盘和音圈电机（VCM），其可操作以使致动器臂围绕枢轴旋转，以在磁盘上径向驱动磁头。在音圈两端测量音圈电压，将VCM的速度指令设定为基本为零，通过启用和禁用电感补偿电路，电感补偿电路至少切换一次，电感补偿电路使能，速度调整VCM的指令，并且产生控制信号并将其施加到音圈以便移动致动器臂，其中响应于调节的速度指令产生控制信号，音圈电压和估计的电感电压。

10. 发明授权

US08896955B1 Adaptive track follow control 有权
标题翻译：自适应跟踪控制
公开(公告)号：US08896955B1
公开(公告)日：2014-11-25
申请号：US13162095
申请日：2011-06-16
申请人： Min Chen , Alain Chahwan , Shang-Chen Wu , Qixing Zheng , Alexander Babinski , Duc T. Phan
发明人： Min Chen , Alain Chahwan , Shang-Chen Wu , Qixing Zheng , Alexander Babinski , Duc T. Phan
IPC分类号： G11B5/596
CPC分类号： G11B5/59622 , G11B5/59694
摘要： A disk drive comprises a track follow control system having a plurality of selectable frequency modes, the track follow control system configured to receive a position error signal and to output a control signal based on the position error signal, wherein the control signal is used by a head assembly to position a head over a disk. The disk drive also comprises a state estimator configured to receive the control signal and a position signal indicating a position of the head, to estimate a disturbance based on the control signal and the position signal, and to output an estimated disturbance signal based on the estimated disturbance. The disk drive further comprises a disturbance evaluator configured to receive the estimated disturbance signal, and to select one of the frequency modes of the track follow control system based on the estimated disturbance signal.
摘要翻译：磁盘驱动器包括具有多个可选频率模式的轨道跟随控制系统，轨道跟随控制系统被配置为接收位置误差信号并基于位置误差信号输出控制信号，其中控制信号由头部组件以将磁头定位在磁盘上。磁盘驱动器还包括状态估计器，其被配置为接收控制信号和指示头部的位置的位置信号，以基于控制信号和位置信号来估计干扰，并且基于所估计的干扰信号来输出估计的干扰信号骚乱。磁盘驱动器还包括被配置为接收所估计的干扰信号的干扰评估器，并且基于估计的干扰信号选择轨道跟随控制系统的频率模式之一。

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