公开(公告)号：US07068463B1

公开(公告)日：2006-06-27

申请号：US10868551

申请日：2004-06-14

申请人： Chuanwen Ji ,  Jianghong Ding

发明人： Chuanwen Ji ,  Jianghong Ding

IPC分类号： G11B21/02

CPC分类号： G11B21/12 ,  G11B5/5547

摘要： A disk drive is disclosed comprising a disk having a plurality of tracks, an actuator arm, a head connected to a distal end of the actuator arm, and a voice coil motor (VCM) for rotating the actuator arm about a pivot to actuate the head over the disk. A driving current is applied to the VCM to control the motion of the actuator arm. A back EMF voltage generated by the VCM is detected, and a velocity of the VCM is estimated in response to the back EMF voltage. The estimated VCM velocity is compared to a target velocity in a velocity profile, wherein the velocity profile comprises at least an acceleration component and a coast component. The driving current is adjusted in response to the comparison so that the velocity of the VCM substantially follows the velocity profile.

摘要翻译： 公开了一种磁盘驱动器，其包括具有多个磁道的磁盘，致动器臂，连接到致动器臂的远端的磁头以及用于围绕枢轴旋转致动器臂以致动头部的音圈电机（VCM） 在磁盘上。 向VCM施加驱动电流以控制致动器臂的运动。 检测由VCM产生的反电动势电压，并且响应于反电动势电压来估计VCM的速度。 将估计的VCM速度与速度分布中的目标速度进行比较，其中速度分布至少包括加速度分量和海岸分量。 响应于比较来调节驱动电流，使得VCM的速度基本上遵循速度分布。

公开(公告)号：US06954324B1

公开(公告)日：2005-10-11

申请号：US10724331

申请日：2003-11-26

申请人： Kuang-Yang Tu ,  Chuanwen Ji

发明人： Kuang-Yang Tu ,  Chuanwen Ji

IPC分类号： G11B15/46 ,  G11B19/20 ,  G11B19/28

CPC分类号： G11B19/20 ,  G11B19/28

摘要： A disk drive is disclosed employing either back electromotive force (BEMF) spindle speed control mode or wedge spindle speed control mode. A BEMF detector monitors the BEMF voltage generated by the windings of the spindle motor to generate a BEMF speed error. The BEMF spindle speed control mode is used to spin up the disk to an operating speed, and the wedge spindle speed control to maintain the disk at the operating speed. While in the wedge spindle speed control mode, a BEMF detection window is disabled to reduce acoustic noise.

摘要翻译： 公开了使用反电动势（BEMF）主轴速度控制模式或楔形主轴速度控制模式的磁盘驱动器。 BEMF检测器监测主轴电机绕组产生的BEMF电压，以产生BEMF速度误差。 BEMF主轴转速控制模式用于将盘旋转到运行速度，并且楔形主轴速度控制将盘保持在运行速度。 在楔形主轴速度控制模式下，禁用BEMF检测窗口以减少声学噪声。

公开(公告)号：US09142235B1

公开(公告)日：2015-09-22

申请号：US12606819

申请日：2009-10-27

申请人： Alexander Babinski ,  Lingfei Zhou ,  Nathan J. Santee ,  Chuanwen Ji ,  Duc T. Phan

发明人： Alexander Babinski ,  Lingfei Zhou ,  Nathan J. Santee ,  Chuanwen Ji ,  Duc T. Phan

IPC分类号： G11B5/596

CPC分类号： G11B5/596 ,  G11B5/5552 ,  G11B5/5582 ,  G11B5/59622

摘要： A disk drive is disclosed comprising a disk having a plurality of tracks, a head, and a voice coil motor (VCM) and a microactuator for actuating the head over the disk in response to a feed-forward compensation value. A sinusoidal disturbance is applied to the microactuator, and the resulting feed-forward compensation value is processed to characterize the microactuator.

摘要翻译： 公开了一种磁盘驱动器，其包括具有多个轨道的磁盘，磁头和音圈电机（VCM）以及用于响应于前馈补偿值而致动磁头的微致动器。 对微致动器施加正弦扰动，并且处理所得到的前馈补偿值以表征微致动器。

公开(公告)号：US08553351B1

公开(公告)日：2013-10-08

申请号：US13267196

申请日：2011-10-06

申请人： Aswartha Narayana ,  Chuanwen Ji ,  Duc T. Phan ,  Min Chen ,  Hengchang Guo

发明人： Aswartha Narayana ,  Chuanwen Ji ,  Duc T. Phan ,  Min Chen ,  Hengchang Guo

IPC分类号： G11B21/02

CPC分类号： G11B5/596 ,  G11B5/59644

摘要： A disk drive is disclosed comprising a head actuated over a disk, the disk comprising a plurality of servo tracks defined by a plurality of servo sectors. An estimated radial location of the head is generated in response to an actuator control signal. A Gray coded track ID is detected from reading a servo sector, and decoded into a detected track ID. A burst position error signal (PES) is generated from reading servo bursts in the servo sector, wherein the burst PES represents a detected fractional servo track offset of the head. When the detected track ID is corrupt, a corrected track ID is generated using the estimated radial location and the burst PES, and the actuator control signal is adjusted in response to the corrected track ID and the burst PES.

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，磁盘包括由多个伺服扇区限定的多个伺服磁道。 响应于致动器控制信号产生头部的估计的径向位置。 通过读取伺服扇区来检测灰色编码轨道ID，并将其解码为检测到的轨迹ID。 脉冲串位置误差信号（PES）是从伺服扇区的伺服脉冲串中产生的，其中脉冲串PES表示检测到的磁头的分数伺服磁道偏移。 当检测到的磁道ID被破坏时，使用估计的径向位置和突发PES产生校正的磁道ID，并且响应于校正的磁道ID和突发PES调整致动器控制信号。

公开(公告)号：US08335049B1

公开(公告)日：2012-12-18

申请号：US12794891

申请日：2010-06-07

申请人： Yanning Liu ,  Chuanwen Ji ,  Nathan J. Santee

发明人： Yanning Liu ,  Chuanwen Ji ,  Nathan J. Santee

IPC分类号： G11B5/596

CPC分类号： G11B19/048 ,  G11B5/5552

摘要： A disk drive is disclosed comprising a first disk surface, a first head coupled to a distal end of an actuator arm, and a voice coil motor (VCM) and a first microactuator operable to actuate the first head over the first disk surface. A servo loop for servoing the head in response to the servo sectors is disabled, and after disabling the servo loop, the first microactuator is excited with a control signal at a test frequency in order to accentuate a crack in the first microactuator. After exciting the first microactuator, the servo loop is enabled, and after enabling the servo loop, the first microactuator is evaluated to detect the crack in the first microactuator.

摘要翻译： 公开了一种磁盘驱动器，包括第一磁盘表面，耦合到致动器臂的远端的第一磁头和音圈电动机（VCM）以及可操作以在第一磁盘表面上致动第一磁头的第一微型致动器。 用于响应于伺服扇区伺服磁头的伺服回路被禁用，并且在禁用伺服回路之后，第一微致动器以测试频率的控制信号被激励，以便加强第一微致动器中的裂纹。 在激活第一个微致动器之后，伺服回路被使能，并且在启用伺服回路之后，评估第一微致动器以检测第一微致动器中的裂纹。

公开(公告)号：US08922937B1

公开(公告)日：2014-12-30

申请号：US13451373

申请日：2012-04-19

申请人： Alain Chahwan ,  Orhan Beker ,  Chuanwen Ji

发明人： Alain Chahwan ,  Orhan Beker ,  Chuanwen Ji

IPC分类号： G11B21/02

CPC分类号： G11B19/042 ,  G11B5/59694

摘要： A disk drive is disclosed comprising a head actuated over a disk, and control circuitry including a vibration sensor. A position error signal (PES) is generated representing a radial location of the head over the disk, and the head is servoed radially over the disk in response to the PES. A first vibration signal is generated in response to the vibration sensor, and a second vibration signal in response to the PES. The first vibration signal is combined with the second vibration signal to generate a third vibration signal, and a vibration event is detected in response to the third vibration signal.

摘要翻译： 公开了一种磁盘驱动器，包括在盘上驱动的磁头，以及包括振动传感器的控制电路。 产生位置误差信号（PES），其表示头部在盘上的径向位置，并且头部响应于PES径向地盘绕在盘上。 响应于振动传感器产生第一振动信号，响应于PES产生第二振动信号。 第一振动信号与第二振动信号组合以产生第三振动信号，并且响应于第三振动信号检测振动事件。

公开(公告)号：US07660067B1

公开(公告)日：2010-02-09

申请号：US11857739

申请日：2007-09-19

申请人： Chuanwen Ji ,  Jianghong Ding ,  Duc T. Phan

发明人： Chuanwen Ji ,  Jianghong Ding ,  Duc T. Phan

IPC分类号： G11B21/02

CPC分类号： G11B5/5565 ,  G11B21/12 ,  Y10S388/934

摘要： A disk drive is disclosed including a disk, a head coupled to a distal end of an actuator arm, and a voice coil motor (VCM) operable to rotate the actuator arm about a pivot to actuate the head radially over the disk, wherein the VCM comprises a coil. Control circuitry within the disk drive measures a load resistance of the coil prior to executing a load operation, wherein the load operation moves the actuator arm off a ramp to load the head onto the disk. The load resistance of the coil is then converted into an initial coil temperature estimate.

摘要翻译： 公开了一种磁盘驱动器，其包括盘，耦合到致动器臂的远端的头部和可操作以围绕枢轴旋转致动器臂的音圈电动机（VCM），以在盘上径向驱动头部，其中VCM 包括线圈。 磁盘驱动器内的控制电路在执行加载操作之前测量线圈的负载电阻，其中负载操作使致动器臂从斜坡移动以将磁头加载到磁盘上。 然后将线圈的负载电阻转换成初始线圈温度估计。

公开(公告)号：US07253582B1

公开(公告)日：2007-08-07

申请号：US10856320

申请日：2004-05-28

申请人： Jianghong Ding ,  Chuanwen Ji ,  David D. Nguyen

发明人： Jianghong Ding ,  Chuanwen Ji ,  David D. Nguyen

IPC分类号： G05B1/06

CPC分类号： G11B19/20 ,  G11B19/2054

摘要： A disk drive is disclosed comprising a spindle motor having a plurality of windings including at least a first winding, a second winding, and a third winding. During a spin-up operation, a voltage is applied to the first winding and a first rise time is measured for current flowing through the first winding to reach a predetermined threshold. A voltage is applied to the second winding and a second rise time is measured for current flowing through the second winding to reach a predetermined threshold. A voltage is applied to the third winding and a third rise time is measured for current flowing through the third winding to reach a predetermined threshold. A difference is computed in response to the first rise time, the second rise time, and the third rise time, and an angular position of the spindle motor is estimated by computing an arctangent in response to the difference.

摘要翻译： 公开了一种磁盘驱动器，其包括具有包括至少第一绕组，第二绕组和第三绕组的多个绕组的主轴电动机。 在升压操作期间，向第一绕组施加电压，并且测量流过第一绕组的电流达到预定阈值的第一上升时间。 对第二绕组施加电压，并且测量流过第二绕组的电流达到预定阈值的第二上升时间。 对第三绕组施加电压，并且测量流过第三绕组的电流达到预定阈值的第三上升时间。 响应于第一上升时间，第二上升时间和第三上升时间来计算差值，并且通过响应于该差异计算反正切来估计主轴电动机的角位置。

公开(公告)号：US06914740B1

公开(公告)日：2005-07-05

申请号：US10724386

申请日：2003-11-26

申请人： Kuang-Yang Tu ,  Chuanwen Ji

发明人： Kuang-Yang Tu ,  Chuanwen Ji

IPC分类号： G11B5/55 ,  G11B15/46

CPC分类号： G11B5/5534 ,  G11B5/5569

摘要： A disk drive is disclosed employing either back electromotive force (BEMF) spindle speed control or wedge spindle speed control. The BEMF spindle speed control is used to calibrate a reference time period representing an accumulation of a predetermined number of wedge-to-wedge times. During wedge spindle speed control, a wedge time period representing an accumulation of a predetermined number of wedge-to-wedge times is measured, and a wedge speed error is computed as the difference between the reference time period and the wedge time period.

摘要翻译： 公开了使用反电动势（BEMF）主轴速度控制或楔形主轴速度控制的磁盘驱动器。 BEMF主轴转速控制用于校准表示预定数量的楔到楔次的累积的参考时间段。 在楔形主轴速度控制期间，测量表示预定数量的楔形楔形时间的累积的楔形时间段，并且将楔形速度误差计算为基准时间段和楔形时间段之间的差。