公开(公告)号：US5721648A

公开(公告)日：1998-02-24

申请号：US589791

申请日：1996-01-22

申请人： Duc Tien Phan ,  Ich Pham

发明人： Duc Tien Phan ,  Ich Pham

IPC分类号： G05B13/04 ,  G05B19/19 ,  G11B5/55 ,  G11B5/596 ,  G11B21/08

CPC分类号： G05B19/19 ,  G05B13/048 ,  G11B21/085 ,  G11B5/5526 ,  G11B5/59605 ,  G11B5/59627 ,  G11B5/59644 ,  G11B5/5965 ,  G05B2219/23312 ,  G05B2219/41021 ,  G05B2219/41093 ,  G05B2219/41133 ,  G05B2219/41367

摘要： A multirate sampled closed-loop digital servo system controls read/write head positioning in a magnetic disc storage device. Using a multirate estimator, positional data embedded in the storage medium is sampled once per sector, and inter-sector positional information is predicted. At least two control signals are provided per sample. The control signals are outputted at a multiple of the measurement sample rate, e.g., twice the sample rate. The estimator estimates head position and velocity, system and DC bias, and accounts for estimator calculation time delay, in the system and in the control updates. Estimated states are based on the measurement, control value, last control value, and last estimated states. Input information used by the estimator includes the digitized sampled position error signal (PES), the Gray code value, the present digital control value, and the last digital control value. At every sample, the present invention calculates the control values based upon estimated read/write head position and velocity, and the absolute position of the target track. Both present and last control values are used for the estimator to compensate for computational delay and for additional system phase lags. To minimize computational delay, the algorithm implementing the estimator and controller requires but one multiplication and one addition are necessary to calculate the control value. Once the heads are moved close to the desired target tracks, the servo operates closed-loop in track-follow mode.

摘要翻译： 多速率采样闭环数字伺服系统控制磁盘存储设备中的读/写头定位。 使用多速率估计器，嵌入在存储介质中的位置数据每扇区采样一次，并且预测扇区间位置信息。 每个样品至少提供两个控制信号。 控制信号以测量采样率的倍数输出，例如采样速率的两倍。 估计器估计头部位置和速度，系统和直流偏差，并考虑到系统和控制更新中的估计器计算时间延迟。 估计状态基于测量值，控制值，最后控制值和最后估计状态。 由估计器使用的输入信息包括数字化采样位置误差信号（PES），格雷码值，当前数字控制值和最后数字控制值。 在每个样本中，本发明基于估计的读/写头位置和速度以及目标轨道的绝对位置来计算控制值。 当前和最后一个控制值都用于估计器以补偿计算延迟和额外的系统相位滞后。 为了最小化计算延迟，实现估计器和控制器的算法需要一个乘法和一个相加来计算控制值。 一旦磁头移动靠近所需的目标磁道，伺服器在跟踪跟踪模式下操作闭环。

公开(公告)号：US5886846A

公开(公告)日：1999-03-23

申请号：US655916

申请日：1996-05-31

申请人： Ich Pham ,  David Drouin ,  Evelyn Howard

发明人： Ich Pham ,  David Drouin ,  Evelyn Howard

IPC分类号： G11B5/55 ,  G11B5/596 ,  G11B21/08 ,  G11B21/10

CPC分类号： G11B21/106 ,  G11B21/083 ,  G11B5/5534 ,  G11B5/59627 ,  G11B5/5547

摘要： A method for applying an optimal seeking technique to a disk file with excessive repeatable runout includes a method of modifying a control signal for a rotary actuator arm of a disk drive. The control signal is modified during track seeking by adding a runout state that is calculated each time a servo sector of a target data track on a surface of a disk is sampled by read/write heads carried by the actuator arm. A calibration algorithm can be used during track following to determine runout magnitude and runout phase at various preselected calibration tracks on the surface of the disk. A seeking algorithm can be implemented to compensate for the relative runout magnitude and phase variations between present and target tracks.

摘要翻译： 对具有过度可重复跳动的盘文件应用最佳寻找技术的方法包括修改磁盘驱动器的旋转执行器臂的控制信号的方法。 通过添加每当通过由致动器臂承载的读/写头来对盘表面上的目标数据轨道的伺服扇区进行采样时计算出的跳动状态，在跟踪寻找期间修改控制信号。 轨道跟踪期间可以使用校准算法来确定磁盘表面上各种预选校准轨迹的跳动幅度和跳动相位。 可以实现搜索算法来补偿当前和目标轨道之间的相对跳动幅度和相位变化。