公开(公告)号：US06690537B2

公开(公告)日：2004-02-10

申请号：US09904597

申请日：2001-07-13

申请人： Naoyuki Kagami ,  Akira Tokizono ,  Hiroshi Uchida

发明人： Naoyuki Kagami ,  Akira Tokizono ,  Hiroshi Uchida

IPC分类号： G11B5596

CPC分类号： G11B21/083 ,  G11B5/5526

摘要： A read/write head servo control system for data recording devices, wherein a method of compensating initial values is utilized to generate a control signal to move the head from an initial position to a target position. The method estimates and stores multiple position compensation values. A first control signal moves the head from an initial position to a target position. Head position values are sampled as the head moves. Head position deviation values are calculated for the sampled position values. The head position values are utilized to select a set of estimated position compensation values. These values are in turn utilized to generate a second control signal, which is then utilized to control the position of the head.

摘要翻译： 一种用于数据记录装置的读/写头伺服控制系统，其中利用补偿初始值的方法来产生控制信号，以将头从初始位置移动到目标位置。 该方法估计并存储多个位置补偿值。 第一控制信号将头从初始位置移动到目标位置。 头位置值被采样。 针对采样的位置值计算头位置偏差值。 头位置值用于选择一组估计位置补偿值。 这些值又用于产生第二控制信号，然后利用该信号来控制头部的位置。

公开(公告)号：US06831809B2

公开(公告)日：2004-12-14

申请号：US10086204

申请日：2002-02-27

申请人： Naoyuki Kagami ,  Kenji Okada ,  Tetsuo Semba ,  Akira Tokizono ,  Hiroshi Uchida ,  Akinori Yuba

发明人： Naoyuki Kagami ,  Kenji Okada ,  Tetsuo Semba ,  Akira Tokizono ,  Hiroshi Uchida ,  Akinori Yuba

IPC分类号： G11B5596

CPC分类号： G11B5/59622

摘要： A control arrangement having a feedforward system and a feedback system, a control model for generating reference position data from a feedforward control signal is separated into an original control model and a compensation filter. Gain of the feedforward control signal is compensated by a gain compensation circuit to form a feedforward control signal after compensation. The reference position data is input to a feedback controller, and a feedback control signal and feedforward control signal are input to a control object. Coefficients of the compensation filter and the gain compensation circuit are compensated on the basis of a head position trajectory obtained by actual seek operation.

摘要翻译： 具有前馈系统和反馈系统的控制装置，用于从前馈控制信号产生参考位置数据的控制模型被分离成原始控制模型和补偿滤波器。 前馈控制信号的增益由增益补偿电路补偿，以在补偿后形成前馈控制信号。 参考位置数据被输入到反馈控制器，反馈控制信号和前馈控制信号被输入到控制对象。 补偿滤波器和增益补偿电路的系数基于通过实际寻道操作获得的磁头位置轨迹进行补偿。

公开(公告)号：US06754019B2

公开(公告)日：2004-06-22

申请号：US09898822

申请日：2001-07-03

申请人： Akira Tokizono ,  Naoyuki Kagami ,  Hiroshi Uchida ,  Takashi Kuroda

发明人： Akira Tokizono ,  Naoyuki Kagami ,  Hiroshi Uchida ,  Takashi Kuroda

IPC分类号： G11B509

CPC分类号： G11B5/54 ,  G11B5/012 ,  G11B5/59611 ,  G11B19/04 ,  G11B21/02 ,  G11B21/10 ,  G11B21/22 ,  G11B27/3027 ,  G11B27/36 ,  G11B2220/20

摘要： An improved system and method for implementing a rotary memory device, including a host system and a disk-shaped memory medium storing position information, or a servo address mark (SAM). If a head fails to read a valid SAM, a dummy SAM is generated to prevent an arm with a read/write head from entering a neutral state. If the normal state cannot be restored within a fixed number of intervals, the system goes into the emergency brake control mode. In this emergency brake control mode, the direction of the head is determined, and the VCM current is applied in such a way drive the arm in the opposite direction. Damage to the magnetic medium and subsequent data loss problems are reduced because the velocity of the head is reduced to a safe level.

摘要翻译： 一种改进的用于实现旋转存储装置的系统和方法，包括主机系统和存储位置信息的盘形存储介质或伺服地址标记（SAM）。 如果磁头无法读取有效的SAM，则会产生一个虚拟SAM，以防止具有读/写磁头的手臂进入中立状态。 如果在固定数量的间隔内无法恢复正常状态，则系统进入紧急制动控制模式。 在该紧急制动控制模式中，确定头部的方向，并且以这样的方式施加VCM电流沿相反方向驱动臂。 由于磁头的速度降低到一个安全的水平，磁介质的损坏和随后的数据丢失问题被减少了。

公开(公告)号：US06324132B1

公开(公告)日：2001-11-27

申请号：US09429699

申请日：1999-10-28

申请人： Naoyuki Kagami ,  Akira Tokizono ,  Hiroshi Uchida

发明人： Naoyuki Kagami ,  Akira Tokizono ,  Hiroshi Uchida

IPC分类号： G11B1722

CPC分类号： G11B21/083 ,  G11B5/5526

摘要： A read/write head servo control system for data recording devices, wherein a method of compensating initial values is utilized to generate a control signal to move the head from an initial position to a target position. The method estimates and stores multiple position compensation values. A first control signal moves the head from an initial position to a target position. Head position values are sampled as the head moves. Head position deviation values are calculated for the sampled position values. The head position values are utilized to select a set of estimated position compensation values. These values are in turn utilized to generate a second control signal, which is then utilized to control the position of the head.

公开(公告)号：US06529344B1

公开(公告)日：2003-03-04

申请号：US09426425

申请日：1999-10-25

申请人： Naoyuki Kagami ,  Akira Tokizono

发明人： Naoyuki Kagami ,  Akira Tokizono

IPC分类号： G11B5596

CPC分类号： G11B5/59605

摘要： A method and system for compensating head positioning servo in a storage device. In accordance with the method and apparatus of the present invention, an open-loop gain of a head positioning servo is calculated when the head positioning servo causes a head to follow a predetermined position of a target track of a storage media surface by generating a position detecting signal utilizing a position detecting signal gain. A compensated position detecting signal gain is generated by compensating the position detecting signal gain according to a difference between a first predetermined value and the open-loop gain of the head positioning servo, such that variability of the position detecting signal and the open-loop gain is reduced to achieve stability in a head positioning servo.

摘要翻译： 一种用于补偿存储装置中的头部定位伺服的方法和系统。 根据本发明的方法和装置，当磁头定位伺服机构通过产生一个位置使磁头跟随存储介质表面的目标磁道的预定位置时，计算磁头定位伺服的开环增益 利用位置检测信号增益来检测信号。 通过根据第一预定值和头定位伺服的开环增益之间的差补偿位置检测信号增益来产生补偿位置检测信号增益，使得位置检测信号和开环增益的变化 减少了在头部定位伺服中的稳定性。

公开(公告)号：US06219196B1

公开(公告)日：2001-04-17

申请号：US09153199

申请日：1998-09-14

申请人： Tetsuo Semba ,  Naoyuki Kagami ,  Akira Tokizono

发明人： Tetsuo Semba ,  Naoyuki Kagami ,  Akira Tokizono

IPC分类号： G11B2102

CPC分类号： G11B5/596

摘要： The present invention teaches the realization of a stable feedback control by selecting an optimal notch filter in an apparatus, such as a hard disk drive, that employs a positioning apparatus, such as an actuator, for positioning an object. The present invention further teaches the derivation of a frequency characteristic of a control loop excluding a notch filter by employing a method that does not damage a positioning apparatus. The present invention further teaches the method of adjusting a notch filter in accordance with a change of the resonant frequency of an actuator caused by the temperature fluctuations to prevent any deterioration of a feedback control performance.

摘要翻译： 本发明教导了通过在诸如硬盘驱动器的装置中选择最佳陷波滤波器来实现稳定的反馈控制，该设备采用诸如致动器的定位装置来定位物体。 本发明还通过采用不损坏定位装置的方法来教导除了陷波滤波器之外的控制回路的频率特性的推导。 本发明进一步教导了根据由温度波动引起的致动器的谐振频率的变化来调整陷波滤波器的方法，以防止反馈控制性能的任何劣化。

公开(公告)号：US06567230B1

公开(公告)日：2003-05-20

申请号：US09429696

申请日：1999-10-28

申请人： Naoyuki Kagami ,  Akira Tokizono ,  Sri M. Sri-Jayantha ,  Tatsuya Sakai ,  Isao Yoneda ,  Hien Phu Dang ,  Arun Sharma

发明人： Naoyuki Kagami ,  Akira Tokizono ,  Sri M. Sri-Jayantha ,  Tatsuya Sakai ,  Isao Yoneda ,  Hien Phu Dang ,  Arun Sharma

IPC分类号： G11B2102

CPC分类号： H03H17/0294 ,  G11B5/5521 ,  G11B5/56

摘要： A method and system for utilizing a digital filter for actuator positioning control in a disk device. In accordance with the method and system of the present invention multiple selectable filter modules are provided. Each of the multiple selectable filter modules functions in a serial or parallel filtering mode when selected. Multiple configurable registers are also provided wherein the configuration of each of the multiple configurable registers determines a selection of at least one of the multiple selectable filter modules. Particular ones of the multiple configurable registers are selected, such that a configuration of the digital filter is dynamically selectable in order to achieve a predetermined filter output.

摘要翻译： 一种利用数字滤波器在盘装置中执行器定位控制的方法和系统。 根据本发明的方法和系统，提供了多个可选择的过滤器模块。 多个可选滤波器模块中的每一个在选择时以串行或并行滤波模式运行。 还提供了多个可配置寄存器，其中多个可配置寄存器中的每一个的配置确定多个可选择滤波器模块中的至少一个的选择。 选择多个可配置寄存器中的特定的寄存器，使得可以动态地选择数字滤波器的配置以便实现预定的滤波器输出。

公开(公告)号：US06218794B1

公开(公告)日：2001-04-17

申请号：US09429529

申请日：1999-10-28

申请人： Yasuhito Shimizu ,  Naoyuki Kagami ,  Akira Tokizono ,  Akihiro Ohyama

发明人： Yasuhito Shimizu ,  Naoyuki Kagami ,  Akira Tokizono ,  Akihiro Ohyama

IPC分类号： H02P118

CPC分类号： H02P6/20

摘要： A spindle motor start up method wherein a torque balance between the stator and rotor is broken so as to avoid startup malfunctions, and thereby improve motor startup time in spindle motors prone to startup malfunctions, such as hard disk drive motors having a 4:3 ratio of the number of rotor magnetic poles to the number of stator slots. Processes for breaking a torque balance according to the present invention include: (1) gradually decreasing an initial commutation (switching of each phase) frequency at the startup timing from a frequency higher than a commutation frequency in a conventional startup; (2) gradually decreasing an initial commutation frequency at the startup timing from a frequency higher than a commutation frequency in a conventional startup to a low frequency, and next, gradually increasing the initial frequency from the low frequency; (3) changing a drive current of the spindle motor so as to break a torque balance between the spindle motor stator and rotor; (4) monitoring a back electromotive force detection signal while commutating, and restarting commutation when the back electromotive force detection signal is not detected; and (5) monitoring a back electromotive force detection signal while commutating, resetting the commutation at a time in a commutation sequence after an initial commutation from a first phase to a second phase, and restarting the commutation from the first phase to the second phase.

摘要翻译： 一种主轴电动机起动方法，其中定子和转子之间的转矩平衡被破坏以避免起动故障，从而提高容易发生起动故障的主轴电动机中的电动机启动时间，例如具有4:3比例的硬盘驱动电动机 的转子磁极的数量与定子槽的数量。 根据本发明的用于断开扭矩平衡的处理包括：（1）在常规启动中，从起始频率高于换向频率的频率逐渐减小启动时刻的初始换向（每相切换）频率; （2）从常规启动中的高于换流频率的频率开始到启动定时的初始换向频率逐渐降低到低频，接着从低频逐渐增加初始频率; （3）改变主轴电动机的驱动电流，以断开主轴电动机定子和转子之间的转矩平衡; （4）在整流时监视反电动势检测信号，并且在未检测到反电动势检测信号时重新开始换向; 以及（5）在整流时监视反电动势检测信号，在从第一相到第二相的初始换向之后，在换向序列中的一次复位，并且重新开始从第一相到第二相的换向。

公开(公告)号：US5872677A

公开(公告)日：1999-02-16

申请号：US735689

申请日：1996-10-23

申请人： Naoyuki Kagami ,  Akira Tokizono ,  Yuzo Nakagawa

发明人： Naoyuki Kagami ,  Akira Tokizono ,  Yuzo Nakagawa

IPC分类号： G11B5/596

CPC分类号： G11B5/596

摘要： A magnetic head position detecting method is provided in which a first and a second position detection signal representative of a particular position of a magnetic head with respect to a magnetic disk is obtained. The first and the second position detection signal preferably is obtained by utilizing a burst pattern formed on the magnetic disk. Subsequently, a third position detection signal is generated by multiplying the first and the second position detection signals by a predetermined gain so that the third position detection signal changes linearly. The particular position of the magnetic head is detected by using the third position detection signal. In addition, a magnetic disk apparatus implementing the magnetic head position detecting method is provided.

摘要翻译： 提供一种磁头位置检测方法，其中获得表示磁头相对于磁盘的特定位置的第一和第二位置检测信号。 优选地，通过利用形成在磁盘上的脉冲串图形来获得第一和第二位置检测信号。 随后，通过将第一和第二位置检测信号乘以预定的增益使得第三位置检测信号线性地变化来产生第三位置检测信号。 通过使用第三位置检测信号来检测磁头的特定位置。 另外，提供了实现磁头位置检测方法的磁盘装置。

公开(公告)号：US07035034B2

公开(公告)日：2006-04-25

申请号：US10442803

申请日：2003-05-21

申请人： Tetsuo Semba ,  Naoyuki Kagami ,  Akira Tokizono ,  Gaku Ikedo

发明人： Tetsuo Semba ,  Naoyuki Kagami ,  Akira Tokizono ,  Gaku Ikedo

IPC分类号： G11B5/596

CPC分类号： G11B5/5526 ,  G11B5/5582

摘要： A hard disk device includes a servo control unit that constitutes a servo loop for a head seek for performing read/write of data from/to a recording medium, a correction signal generation unit for generating a correction signal for correcting a control by the servo control unit based on an output of a predetermined sensor, and a correction signal control unit for estimating an effect of supplying the correction signal to the servo loop and for controlling whether or not the correction signal is to be supplied to the servo loop in response to a result of the estimation. Moreover, the gain of the sensor is dynamically controlled in response to the above estimation result.