公开(公告)号：US08958169B1

公开(公告)日：2015-02-17

申请号：US14302088

申请日：2014-06-11

申请人： Western Digital Technologies, Inc.

发明人： Yanan Huang ,  Orhan Beker ,  Yiqian Li ,  Xiao Ma ,  Wenlin Zhang

IPC分类号： G11B21/02 ,  G11B5/55

CPC分类号： G11B5/5547

摘要： A data storage device is disclosed comprising a disk comprising a plurality of tracks defined by servo sectors, a head, and a servo controller configured to servo the head over the disk based on an estimated state generated by a state estimator. The servo controller is configured to execute a seek operation to seek the head over the disk and recover from a servo fault during the seek operation by generating an initial state estimate of the head at the beginning of the servo fault, and decelerating the head open-loop using a model-based deceleration control in response to the initial state estimate. While decelerating the head, the state estimator is re-qualified before the head reaches zero velocity, and after re-qualifying the state estimator and before the head reaches zero velocity, a seek operation is executed to seek the head to a target track closed-loop using the state estimator.

摘要翻译： 公开了一种数据存储装置，包括由伺服扇区，头部和伺服控制器定义的多个磁道的磁盘，所述磁头和伺服控制器被配置为基于由状态估计器产生的估计状态来将磁头伺服在磁盘上。 伺服控制器被配置为执行搜索操作以在寻道操作期间通过在伺服故障开始时产生头的初始状态估计而在磁盘上寻找磁头并从伺服故障恢复，并且使磁头开路减速， 循环使用基于模型的减速控制来响应初始状态估计。 当头部减速时，状态估计器在头部达到零速度之前被重新限定，并且在重新判定状态估计器之后并且在头部达到零速度之前，执行搜索操作以将头部寻找到目标轨道闭合 - 循环使用状态估计器。

公开(公告)号：US09153283B1

公开(公告)日：2015-10-06

申请号：US14501471

申请日：2014-09-30

申请人： Western Digital Technologies, Inc.

发明人： Wei Xi ,  Wenlin Zhang

IPC分类号： G11B5/596 ,  G11B20/10 ,  G11B5/09 ,  G11B5/55

CPC分类号： G11B5/5552 ,  G11B5/59627 ,  G11B5/59677

摘要： A data storage device is disclosed comprising a microactuator configured to actuate a head over a disk. A control signal applied to the microactuator is generated based on an input sequence u(k). A Preisach bit map bj is updated based on the input sequence u(k), wherein the Preisach bit map bj corresponds to a Preisach plane modeling a hysteretic response of the microactuator. A current compensation value yi is generated based on an update value generated based on: ∑ j ⁢ h ⁡ ( j ) ⁢ b ^ j where hj represents a slice of the Preisach plane and {circumflex over (b)}j is an update bit map based on at least part of the Preisach bit map bj. The current input ui and the current compensation value yi are combined to generate the control signal applied to the microactuator.

摘要翻译： 公开了一种数据存储装置，其包括微致动器，该微致动器被配置成在磁盘上致动磁头。 基于输入序列u（k）生成施加到微致动器的控制信号。 基于输入序列u（k）更新Preisach位图bj，其中Preisach位图bj对应于对微致动器的迟滞响应建模的Preisach平面。 基于以下生成的更新值，生成电流补偿值yi：Σj h⁡（j）b ^ j其中，hj表示Preisach平面的切片，并且{circumflex over（b）} j是更新位 基于Preisach位图bj的至少一部分映射。 电流输入ui和电流补偿值yi被组合以产生施加到微致动器的控制信号。