Magnetic disk device with positioning control

    公开(公告)号:US20060291088A1

    公开(公告)日:2006-12-28

    申请号:US11475384

    申请日:2006-06-26

    IPC分类号: G11B5/596

    CPC分类号: G11B5/59605

    摘要: In a magnetic disk device, oscillation occurring at a frequency higher than Nyquist frequency is suppressed. In one embodiment, a multi-late filter having a resonance point at a frequency higher than the intended Nyquist frequency is introduced in a previous stage of a controlled object. At that time, since a resonance characteristic of the multi-rate filter is aliased by a sampler, the multi-rate filter is designed such that the resonance point after the aliasing is stabilized in phase by a following compensator.

    Positioning control apparatus
    3.
    发明授权
    Positioning control apparatus 失效
    定位控制装置

    公开(公告)号:US06819522B2

    公开(公告)日:2004-11-16

    申请号:US10294595

    申请日:2002-11-15

    IPC分类号: G11B5596

    CPC分类号: G11B5/5526

    摘要: A positioning control apparatus for a magnetic disk apparatus. Internal models and a trajectory generation section are constructed in a control program. Based on generated position trajectory and velocity trajectory and an internal model position and velocity, a model control section outputs a first operation signal Umf for a fixed sample time Tu and then outputs a second operation signal Ums for Tu. The model control section calculates Umf and Ums so as to cause a position Pm and a velocity Vm output by an internal model 2Tu seconds later to coincide with the generated position trajectory and velocity trajectory. When a detector has detected a voice coil saturation current for head movement, a signal obtained by subtracting a position feedback signal Uh from a detected voice coil current is used as an internal model input to thereby cause the model to track a control subject.

    摘要翻译: 一种用于磁盘装置的定位控制装置。 在控制程序中构建内部模型和轨迹生成部分。 基于生成的位置轨迹和速度轨迹以及内部模型位置和速度,模型控制部分输出固定采样时间Tu的第一操作信号Umf,然后输出Tu的第二操作信号Ums。 模型控制部分计算Umf和Ums,以使秒针后的内部模型输出的位置Pm和速度Vm与生成的位置轨迹和速度轨迹一致。 当检测器检测到用于磁头移动的音圈饱和电流时,将通过从检测到的音圈电流中减去位置反馈信号Uh而获得的信号用作内部模型输入,从而使模型跟踪控制对象。

    HEAD POSITION CONTROL METHOD AND DISK DEVICE
    4.
    发明申请
    HEAD POSITION CONTROL METHOD AND DISK DEVICE 审中-公开
    头位置控制方法和磁盘设备

    公开(公告)号:US20120106000A1

    公开(公告)日:2012-05-03

    申请号:US13266524

    申请日:2010-04-02

    IPC分类号: G11B21/02

    CPC分类号: G11B5/59627

    摘要: A track locus drawn on a disk discretely contains repeatable runout (RRO) components which are large in amplitude up to high-frequency band. In order to position a magnetic head along the track locus using filters good at suppressing RRO with resonance characteristics only at an integral multiple of a rotation frequency, many filters are required and thus it takes a long time for all the filters to go into a steady state. After learning until the filers go into a steady state, output values of the filters in a steady state are stored on a disk or in a memory. According to controlling the magnet head using these stored output values, the time required for the filters to go into a steady state becomes unnecessary.

    摘要翻译: 在盘上绘制的轨道轨迹离散地包含幅度高达高频带的可重复跳动(RRO)分量。 为了使用具有谐振特性的滤波器的滤波器沿着轨道轨迹定位磁头,仅使用旋转频率的整数倍,需要许多滤波器,因此所有滤波器需要很长时间才能进入稳定 州。 在学习到文件管理器进入稳定状态之后,处于稳定状态的滤波器的输出值被存储在磁盘或存储器中。 根据使用这些存储的输出值来控制磁头,使得滤波器进入稳定状态所需的时间变得不必要。

    HARD-DISK DRIVE INCLUDING FLY-HEIGHT-ADJUSTMENT HEATING ELEMENT AND POSITION-ADJUSTMENT HEATING ELEMENT AND METHOD OF CONTROLLING FLY HEIGHT
    5.
    发明申请
    HARD-DISK DRIVE INCLUDING FLY-HEIGHT-ADJUSTMENT HEATING ELEMENT AND POSITION-ADJUSTMENT HEATING ELEMENT AND METHOD OF CONTROLLING FLY HEIGHT 失效
    硬盘驱动器,包括飞高调节加热元件和位置调节加热元件以及控制飞行高度的方法

    公开(公告)号:US20110080671A1

    公开(公告)日:2011-04-07

    申请号:US12635641

    申请日:2009-12-10

    IPC分类号: G11B21/12

    CPC分类号: G11B5/6064 G11B5/6005

    摘要: A hard-disk drive. The hard-disk drive includes a head-slider configured to fly in proximity with a recording surface of a magnetic-recording disk, and a fly-height variation compensator configured to generate a signal for compensating variation in fly height of a write element of the head-slider. The head-slider further includes the write element configured to write data to the magnetic-recording disk, a fly-height-adjustment heating element configured to displace the write element towards the magnetic-recording disk, and a position-adjustment heating element configured to displace the write element in at least a direction perpendicular to a flying direction. The fly-height variation compensator is further configured to add the signal for compensating variation in fly height to a control signal for output to the fly-height-adjustment heating element.

    摘要翻译: 硬盘驱动器。 硬盘驱动器包括头部滑块,其被配置为与磁记录盘的记录表面靠近地飞行;飞高变化补偿器,被配置为产生用于补偿所述写入元件的飞行高度变化的信号 头滑块 磁头滑动器还包括被配置为将数据写入磁记录盘的写入元件,配置成将写入元件朝向磁记录盘移位的飞行高度调节加热元件,以及配置为 至少在垂直于飞行方向的方向上移位写入元件。 飞高变化补偿器还被配置为将用于补偿飞行高度变化的信号添加到控制信号,以输出到飞行高度调节加热元件。

    DISK DEVICE
    6.
    发明申请
    DISK DEVICE 失效
    磁盘设备

    公开(公告)号:US20100321819A1

    公开(公告)日:2010-12-23

    申请号:US12740242

    申请日:2008-10-16

    申请人: Takenori Atsumi

    发明人: Takenori Atsumi

    IPC分类号: G11B21/02

    摘要: In a positioning control system for a head of a magnetic disk device etc, a frequency of a disturbance oscillation having a specific oscillation component whose amplitude changes with a head position, is selected as a target frequency. Next, a resonance filter is so designed that it has a resonance characteristic at the target frequency and a variable gain device A having the gain changing with head position and a variable gain device B having inverse characteristics to the device A are connected to input and output terminals of the resonance filter, respectively. Input to the filter is made 0 during seek operation and an error signal is used as the input to the filter through the device A after the end of the seek operation. The variable gain devices A and B are controlled so that their product becomes 1.

    摘要翻译: 在用于磁盘装置的头部的定位控制系统中,选择具有振幅随着头部位置变化的特定振动分量的干扰振荡的频率作为目标频率。 接下来,谐振滤波器被设计成使得其在目标频率处具有谐振特性,并且具有随着头部位置改变的增益的可变增益器件A和具有与器件A的反向特性的可变增益器件B连接到输入和输出 端子分别为谐振滤波器。 在寻道操作期间,滤波器的输入为0,在寻道操作结束后通过器件A将误差信号用作滤波器的输入。 控制可变增益器件A和B使其产品变为1。

    Magnetic disk drive
    7.
    发明申请
    Magnetic disk drive 失效
    磁盘驱动器

    公开(公告)号:US20070211371A1

    公开(公告)日:2007-09-13

    申请号:US11709979

    申请日:2007-02-22

    IPC分类号: G11B5/596

    CPC分类号: G11B5/5547 G11B5/5582

    摘要: Embodiments in accordance with the present invention relate to a positioning control system of a magnetic disk drive. Even if there is no phase correlation in a specific vibration component before and after a seek operation of a magnetic head, a resonance filter in accordance with an embodiment of the present invention follows the vibration at the frequency at high speed. A frequency showing a periodic disturbance is selected as a target frequency Ft[Hz]. A resonance filter showing a peak gain at a frequency Ft is designed. For an input to the resonance filter, a time-variable gain K(t) is used that varies depending on the time lapsed after the completion of a seek operation. This time-variable gain K(t) takes a value larger than 1 when the resonance filter starts operating, and after the lapse of a fixed length of time, the value becomes 1 by degrees.

    摘要翻译: 根据本发明的实施例涉及一种磁盘驱动器的定位控制系统。 即使在磁头搜索操作之前和之后的特定振动分量中没有相位相关,根据本发明的实施例的谐振滤波器跟随高频频率的振动。 选择显示周期性干扰的频率作为目标频率Ft [Hz]。 设计了表示频率Ft的峰值增益的共振滤波器。 对于谐振滤波器的输入,使用根据寻道操作完成之后经过的时间而变化的时变增益K(t)。 当谐振滤波器开始工作时,该时变增益K(t)取大于1的值,并且在经过固定时间长度之后,该值变为1度。

    Magnetic disk drive with feedback control
    8.
    发明申请
    Magnetic disk drive with feedback control 有权
    带反馈控制的磁盘驱动器

    公开(公告)号:US20050207057A1

    公开(公告)日:2005-09-22

    申请号:US11083887

    申请日:2005-03-18

    申请人: Takenori Atsumi

    发明人: Takenori Atsumi

    CPC分类号: G11B5/5547

    摘要: A feedforward control system using a polynomial formula not affected by discretization error is realized in a magnetic disk drive. In one embodiment, the magnetic disk drive is intended to move a head for performing at least one of recording and playback to and from a magnetic recording medium to a target position. The feedforward input has a seek control system computed by a polynominal formula of a time function. The coefficients of the polynomial formula have been derived from boundary conditions including the characteristics of a zero-order hold.

    摘要翻译: 在磁盘驱动器中实现使用不受离散化误差影响的多项式公式的前馈控制系统。 在一个实施例中,磁盘驱动器旨在移动用于执行从磁记录介质到目标位置的记录和重放中的至少一个的磁头。 前馈输入具有通过时间函数的多项式公式计算的搜索控制系统。 多项式公式的系数已经从包括零级保持的特征的边界条件导出。

    Hard-disk drive including fly-height-adjustment heating element and position-adjustment heating element and method of controlling fly height
    9.
    发明授权
    Hard-disk drive including fly-height-adjustment heating element and position-adjustment heating element and method of controlling fly height 失效
    包括飞高调节加热元件和位置调整加热元件的硬盘驱动器以及控制飞行高度的方法

    公开(公告)号:US08593749B2

    公开(公告)日:2013-11-26

    申请号:US12635641

    申请日:2009-12-10

    IPC分类号: G11B21/16

    CPC分类号: G11B5/6064 G11B5/6005

    摘要: A hard-disk drive. The hard-disk drive includes a head-slider configured to fly in proximity with a recording surface of a magnetic-recording disk, and a fly-height variation compensator configured to generate a signal for compensating variation in fly height of a write element of the head-slider. The head-slider further includes the write element configured to write data to the magnetic-recording disk, a fly-height-adjustment heating element configured to displace the write element towards the magnetic-recording disk, and a position-adjustment heating element configured to displace the write element in at least a direction perpendicular to a flying direction. The fly-height variation compensator is further configured to add the signal for compensating variation in fly height to a control signal for output to the fly-height-adjustment heating element.

    摘要翻译: 硬盘驱动器。 硬盘驱动器包括头部滑块,其被配置为与磁记录盘的记录表面靠近地飞行;飞高变化补偿器,被配置为产生用于补偿所述写入元件的飞行高度变化的信号 头滑块 磁头滑动器还包括被配置为将数据写入磁记录盘的写入元件,配置成将写入元件朝向磁记录盘移位的飞行高度调节加热元件,以及配置为 至少在垂直于飞行方向的方向上移位写入元件。 飞高变化补偿器还被配置为将用于补偿飞行高度变化的信号添加到控制信号,以输出到飞行高度调节加热元件。

    Disk device
    10.
    发明授权
    Disk device 失效
    磁盘设备

    公开(公告)号:US08488268B2

    公开(公告)日:2013-07-16

    申请号:US12740242

    申请日:2008-10-16

    申请人: Takenori Atsumi

    发明人: Takenori Atsumi

    IPC分类号: G11B5/596

    摘要: In a positioning control system for a head of a magnetic disk device etc, a frequency of a disturbance oscillation having a specific oscillation component whose amplitude changes with a head position, is selected as a target frequency. Next, a resonance filter is so designed that it has a resonance characteristic at the target frequency and a variable gain device A having the gain changing with head position and a variable gain device B having inverse characteristics to the device A are connected to input and output terminals of the resonance filter, respectively. Input to the filter is made 0 during seek operation and an error signal is used as the input to the filter through the device A after the end of the seek operation. The variable gain devices A and B are controlled so that their product becomes 1.

    摘要翻译: 在用于磁盘装置的头部的定位控制系统中,选择具有振幅随着头部位置变化的特定振动分量的干扰振荡的频率作为目标频率。 接下来,谐振滤波器被设计成使得其在目标频率处具有谐振特性,并且具有随着头部位置改变的增益的可变增益器件A和具有与器件A的反向特性的可变增益器件B连接到输入和输出 端子分别为谐振滤波器。 在寻道操作期间,滤波器的输入为0,在寻道操作结束后通过器件A将误差信号用作滤波器的输入。 控制可变增益器件A和B使其产品变为1。