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    • 81. 发明申请
    • Method and apparatus reducing off track head motion due to disk vibration in a hard disk drive through the head gimbal assembly
    • 方法和装置减少由于硬盘驱动器中的磁头振动通过头部万向节组件引起的轨道头运动
    • US20050007702A1
    • 2005-01-13
    • US10619163
    • 2003-07-10
    • Dong-Ho OhSeong-Woo KangYun-Sik HanYoung-Hoon KimMyeong-Eop KimTae-Yeon HwangJae-Won Kim
    • Dong-Ho OhSeong-Woo KangYun-Sik HanYoung-Hoon KimMyeong-Eop KimTae-Yeon HwangJae-Won Kim
    • G11B21/02G11B5/55G11B5/48
    • G11B5/5552G11B5/4873G11B5/6011
    • Improved head gimbal assemblies reducing TMR (Track Mis-Registration) in a hard disk drive are provided. These head gimbal assemblies are as mechanically simple as contemporary head gimbal assemblies, support parallel flying sliders over flat disk surfaces, and reduce TMR induced by disk vibration. They are easier to build, more reliable, and cost less to make, than other known approaches at comparable track densities and rotational rates. The improved head gimbal assemblies include three sets of mechanisms for moving the slider parallel the disk surface, when the disk surface is flat, and radially moving the slider toward the track, when the disk surface is bent. The first and third mechanisms as well as the second and third mechanisms can be used together in a head gimbal assembly. An improved and distinctive servo-controller scheme resulting in an overall improvement in PES performance, particularly when applied to hard disk drives employing the invention's TMR reduction mechanisms. The servo-controllers trade off gain in the disk vibration frequency range, in favor of, increased rejection of low frequency disturbances. This leads to the lowest PES statistics, when applied to hard disk drives with the TMR reduction mechanisms of the invention.
    • 提供了改进的头万向节组件,减少了硬盘驱动器中的TMR(跟踪错位)。 这些头万向架组件与当代头万向架组件一样机械简单,在平盘表面上支撑平行的飞行滑块,并减少由磁盘振动引起的TMR。 与其他已知方法相比,其轨迹密度和转速可比较容易构建,更可靠,成本更低。 改进的头万向节组件包括三组机构,用于当盘表面平坦时平行于盘表面移动滑块,并且当盘表面弯曲时使滑块朝向轨道径向移动。 第一和第三机构以及第二和第三机构可以一起用在头部万向架组件中。 改进和独特的伺服控制器方案导致PES性能的总体改进,特别是当应用于采用本发明的TMR减小机构的硬盘驱动器时。 伺服控制器在磁盘振动频率范围内取消增益,有利于提高低频干扰的抑制。 当应用于具有本发明的TMR减少机制的硬盘驱动器时,这导致最低的PES统计。
    • 86. 发明授权
    • Methods for closed-loop compensation of ultra-high frequency disturbances in hard disk drives and hard disk drives utilizing same
    • 使用硬盘驱动器和硬盘驱动器的超高频干扰的闭环补偿方法
    • US08630059B1
    • 2014-01-14
    • US13408974
    • 2012-02-29
    • Xu ChenWei XiYoung-Hoon KimKuang-Yang Tu
    • Xu ChenWei XiYoung-Hoon KimKuang-Yang Tu
    • G11B5/596
    • G11B5/59694
    • A disk drive comprises a disk, an actuator arm and a servo controller using a position error signal to generate a controller output signal to control the actuator arm. A plant mechanically models at least a portion of the disk drive, receives a control command to which an unknown disturbance is added and generates a plant output. A disturbance observer (DOB) uses the control command and the plant output to generate a delayed and estimated version of the disturbance. The DOB comprises a Q filter having a selected center frequency. A perfect phase cancellation filter (PPCF) is configured to receive the delayed and estimated version of the disturbance, to reject selected disturbances and to align the desired attenuation frequency with the selected center frequency. The output of the PPCF is subtracted from the controller output signal to generate the control command.
    • 磁盘驱动器包括盘,致动器臂和使用位置误差信号的伺服控制器,以产生控制器输出信号以控制致动器臂。 工厂对至少一部分磁盘驱动器进行机械建模,接收到添加了未知扰动的控制命令,并生成工厂输出。 干扰观测器(DOB)使用控制命令和设备输出来产生干扰的延迟和估计版本。 DOB包括具有所选中心频率的Q滤波器。 完美相位消除滤波器(PPCF)被配置为接收干扰的延迟和估计版本,以抑制所选择的干扰并将期望的衰减频率与所选择的中心频率对准。 从控制器输出信号中减去PPCF的输出,生成控制命令。