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公开(公告)号：US20060203375A1
公开(公告)日：2006-09-14
申请号：US11138244
申请日：2005-05-25
IPC分类号： G11B21/02
摘要： Embodiments of the invention provide a magnetic disk drive and magnetic disk drive control method for unloading a head safely with a simple configuration when a positioning control signal cannot be detected due, for instance, to a seek error. In one embodiment, when a head cannot detect servo information prerecorded on a disk, a positioning control section resets and starts a time counting section, and switches to an unloading control section for causing the unloading control section to output a position control signal to a VCM driver. The time counting section counts tacho-pulses generated by a motor driver, and outputs time information. The unloading control section receives the time information from the time counting section. In accordance with the received time information, the unloading control section computes the position control signal that the positioning control section outputs to the VCM driver. In this instance, the unloading control section controls the VCM driver to provide such an electrical current profile that the drive current to be supplied to a VCM is small at an initial stage and large at a later stage.
摘要翻译： 本发明的实施例提供一种磁盘驱动器和磁盘驱动器控制方法，当由于例如寻道误差而不能检测定位控制信号时，以简单的配置来安全地卸载磁头。 在一个实施例中，当头不能检测到预先记录在盘上的伺服信息时，定位控制部分复位并启动时间计数部分，并且切换到卸载控制部分，以使卸载控制部分向VCM输出位置控制信号 司机。 时间计数部分计算由电机驱动器产生的转速脉冲，并输出时间信息。 卸载控制部分从时间计数部分接收时间信息。 根据接收到的时间信息，卸载控制部分计算定位控制部分向VCM驱动器输出的位置控制信号。 在这种情况下，卸载控制部分控制VCM驱动器以提供在初始阶段提供给VCM的驱动电流较小并在稍后阶段较大的电流分布。
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公开(公告)号：US07133242B2
公开(公告)日：2006-11-07
申请号：US11138244
申请日：2005-05-25
摘要： Embodiments of the invention provide a magnetic disk drive and magnetic disk drive control method for unloading a head safely with a simple configuration when a positioning control signal cannot be detected due, for instance, to a seek error. In one embodiment, when a head cannot detect servo information prerecorded on a disk, a positioning control section resets and starts a time counting section, and switches to an unloading control section for causing the unloading control section to output a position control signal to a VCM driver. The time counting section counts tacho-pulses generated by a motor driver, and outputs time information. The unloading control section receives the time information from the time counting section. In accordance with the received time information, the unloading control section computes the position control signal that the positioning control section outputs to the VCM driver. In this instance, the unloading control section controls the VCM driver to provide such an electrical current profile that the drive current to be supplied to a VCM is small at an initial stage and large at a later stage.
摘要翻译： 本发明的实施例提供一种磁盘驱动器和磁盘驱动器控制方法，当由于例如寻道误差而不能检测定位控制信号时，以简单的配置来安全地卸载磁头。 在一个实施例中，当头不能检测到预先记录在盘上的伺服信息时，定位控制部分复位并启动时间计数部分，并且切换到卸载控制部分，以使卸载控制部分向VCM输出位置控制信号 司机。 时间计数部分计算由电机驱动器产生的转速脉冲，并输出时间信息。 卸载控制部分从时间计数部分接收时间信息。 根据接收到的时间信息，卸载控制部分计算定位控制部分向VCM驱动器输出的位置控制信号。 在这种情况下，卸载控制部分控制VCM驱动器以提供在初始阶段提供给VCM的驱动电流较小并且在稍后阶段较大的电流分布。
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公开(公告)号：US06920007B2
公开(公告)日：2005-07-19
申请号：US10067401
申请日：2002-02-07
CPC分类号： G11B5/6005 , G11B5/54 , G11B21/12 , G11B21/21
摘要： To control load/unload operation of a slider with magnetic head mounted thereon, by which the speed can always be controlled stably while avoiding the slowdown or temporary stop of an actuator during load/unload operation, a magnetic disk drive is configured using magnetic disk media with the servo information written therein beforehand up to the track located at a position corresponding to the landing zone for the load operation of the magnetic head (slider). The speed of the magnetic head (slider) withdrawn to the ramp is controlled at the unload operation. In the stage of initialization for controlling the speed of the load/unload operation, various parameters are recorded and updated to apply a voltage to power amplifier for compensating for the external forces caused by the friction mainly exerted between ramp and slider support members, with reference to the take-off track or the landing track specified in the landing zone.
摘要翻译： 为了控制具有安装在其上的磁头的滑块的装载/卸载操作，通过该滑动器总是可以稳定地控制速度，同时避免在加载/卸载操作期间致动器的减速或暂时停止，磁盘驱动器使用磁盘介质 其中预先写入的伺服信息直到位于对应于着陆区的位置处的磁道用于磁头（滑块）的加载操作。 在卸载操作中控制撤回到斜坡的磁头（滑块）的速度。 在用于控制加载/卸载操作速度的初始化阶段，记录和更新各种参数以向功率放大器施加电压，以补偿主要由斜坡和滑动器支撑构件之间施加的摩擦引起的外力，参考 到着陆区指定的起飞轨道或着陆轨道。
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公开(公告)号：US20080123216A1
公开(公告)日：2008-05-29
申请号：US11985367
申请日：2007-11-14
IPC分类号： G11B21/02
CPC分类号： G11B5/553
摘要： Embodiments of the present invention help to prevent destabilization in voice coil motor (VCM) velocity control. According to one embodiment, a hard disk controller/multiprocessing unit (HDC/MPU) calibrates a correction operational coefficient of a detected back electromotive force (EMF) voltage before unloading. The calibration is carried out in a state that an actuator is pivoting. The HDC/MPU calibrates the correction coefficient according to a motion equation of the actuator using VCM current applied to a VCM and a detected value of a back EMF voltage detection circuit.
摘要翻译： 本发明的实施例有助于防止音圈电机（VCM）速度控制中的不稳定。 根据一个实施例，硬盘控制器/多处理单元（HDC / MPU）在卸载之前校准检测到的反电动势（EMF）电压的校正操作系数。 在致动器枢转的状态下进行校准。 HDC / MPU根据使用施加到VCM的VCM电流的执行器的运动方程和反电动势电压检测电路的检测值来校准校正系数。
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公开(公告)号：US07561369B2
公开(公告)日：2009-07-14
申请号：US11894873
申请日：2007-08-21
IPC分类号： G11B5/596
CPC分类号： G11B5/59627
摘要： Embodiments in accordance with the present invention provide a drive unit that is capable of satisfactorily performing the positioning control with disturbance components included in a position error signal being effectively controlled. According to one embodiment, an error signal generator of a drive unit generates a position error signal (PES) on the basis of servo data read out from a magnetic disk. On the assumption that a frequency of a periodic variation component included in the PES is a target frequency, if a target frequency deviates from an effective frequency range of a digital filter, a downsampler down-samples the PES, and then supplies the PES to the digital filter so that the effective frequency range is shifted. As a result, within the shifted effective frequency range, a setting changing unit can control a setting frequency of the digital filter so that the setting frequency follows the target frequency. Therefore, it is possible to effectively reduce a signal component of the target frequency (a periodic variation component included in the PES).
摘要翻译： 根据本发明的实施例提供一种驱动单元，其能够令人满意地执行定位控制，其中包括在有效控制的位置误差信号中的扰动分量。 根据一个实施例，驱动单元的误差信号发生器基于从磁盘读出的伺服数据产生位置误差信号（PES）。 假设PES中包含的周期性变化分量的频率是目标频率，则如果目标频率偏离数字滤波器的有效频率范围，则下采样器对PES进行下采样，然后将PES提供给 数字滤波器，使有效频率范围发生变化。 结果，在移动的有效频率范围内，设定改变单元可以控制数字滤波器的设定频率，使得设定频率跟随目标频率。 因此，有可能有效地降低目标频率的信号分量（包括在PES中的周期性变化分量）。
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公开(公告)号：US20080297942A1
公开(公告)日：2008-12-04
申请号：US11894873
申请日：2007-08-21
IPC分类号： G11B5/596
CPC分类号： G11B5/59627
摘要： Embodiments in accordance with the present invention provide a drive unit that is capable of satisfactorily performing the positioning control with disturbance components included in a position error signal being effectively controlled. According to one embodiment, an error signal generator of a drive unit generates a position error signal (PES) on the basis of servo data read out from a magnetic disk. On the assumption that a frequency of a periodic variation component included in the PES is a target frequency, if a target frequency deviates from an effective frequency range of a digital filter, a downsampler down-samples the PES, and then supplies the PES to the digital filter so that the effective frequency range is shifted. As a result, within the shifted effective frequency range, a setting changing unit can control a setting frequency of the digital filter so that the setting frequency follows the target frequency. Therefore, it is possible to effectively reduce a signal component of the target frequency (a periodic variation component included in the PES).
摘要翻译： 根据本发明的实施例提供一种驱动单元，其能够令人满意地执行定位控制，其中包括在有效控制的位置误差信号中的扰动分量。 根据一个实施例，驱动单元的误差信号发生器基于从磁盘读出的伺服数据产生位置误差信号（PES）。 假设PES中包含的周期性变化分量的频率是目标频率，则如果目标频率偏离数字滤波器的有效频率范围，则下采样器对PES进行下采样，然后将PES提供给 数字滤波器，使有效频率范围发生变化。 结果，在移动的有效频率范围内，设定改变单元可以控制数字滤波器的设定频率，使得设定频率跟随目标频率。 因此，有可能有效地降低目标频率的信号分量（包括在PES中的周期性变化分量）。
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公开(公告)号：US07800855B2
公开(公告)日：2010-09-21
申请号：US11985367
申请日：2007-11-14
CPC分类号： G11B5/553
摘要： Embodiments of the present invention help to prevent destabilization in voice coil motor (VCM) velocity control. According to one embodiment, a hard disk controller/multiprocessing unit (HDC/MPU) calibrates a correction operational coefficient of a detected back electromotive force (EMF) voltage before unloading. The calibration is carried out in a state that an actuator is pivoting. The HDC/MPU calibrates the correction coefficient according to a motion equation of the actuator using VCM current applied to a VCM and a detected value of a back EMF voltage detection circuit.
摘要翻译： 本发明的实施例有助于防止音圈电机（VCM）速度控制中的不稳定。 根据一个实施例，硬盘控制器/多处理单元（HDC / MPU）在卸载之前校准检测到的反电动势（EMF）电压的校正操作系数。 在致动器枢转的状态下进行校准。 HDC / MPU根据使用施加到VCM的VCM电流的执行器的运动方程和反电动势电压检测电路的检测值来校准校正系数。
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