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    Energy-assisted magnetic recording head and systems thereof with environmental conditions control
    1.
    发明授权
    Energy-assisted magnetic recording head and systems thereof with environmental conditions control 有权
    能量磁记录头及其系统具有环境条件控制

    公开(公告)号：US08760779B2

    公开(公告)日：2014-06-24

    申请号：US13341098

    申请日：2011-12-30

    申请人： William D. Johns ,  David L. Whitaker ,  Ikuya Tagawa ,  Yoshihiro Shiroishi

    发明人： William D. Johns ,  David L. Whitaker ,  Ikuya Tagawa ,  Yoshihiro Shiroishi

    IPC分类号： G11B5/02 ,  G11B27/36

    CPC分类号： G11B5/1278 ,  G11B5/3133 ,  G11B5/6088 ,  G11B2005/0021 ,  G11B2005/0024

    摘要： In one embodiment, a system includes a medium, a magnetic head having a write element adapted for writing data to the medium, a MAMR element and/or a TAMR element adapted for assisting recording on the medium, the MAMR element having a microwave-generating portion that receives current for operation thereof, the TAMR element having a localized heat-generating portion that receives current for operation thereof, and a read element adapted for reading data from the medium, a device adapted for measuring environmental conditions relating to the TAMR/MAMR elements and the medium, and a controller adapted for controlling operation of the magnetic head and adjusting operating parameters of the system based on the environmental conditions. The environmental conditions include temperature, a reproduced signal of the read element, and/or clearance between the TAMR/MAMR elements and the medium. The operating parameters include the clearance, amount of current injected to the TAMR/MAMR elements, and/or write current.

    摘要翻译： 在一个实施例中，系统包括介质，具有适于向介质写入数据的写入元件的磁头，适于在介质上辅助记录的MAMR元件和/或TAMR元件，所述MAMR元件具有微波产生 接收用于其操作的电流的部分，所述TAMR元件具有接收用于其操作的电流的局部热产生部分和适于从所述介质读取数据的读取元件，适于测量与所述TAMR / MAMR有关的环境条件的装置 元件和介质，以及控制器，其适于控制磁头的操作并且基于环境条件调整系统的操作参数。 环境条件包括温度，读取元件的再生信号和/或TAMR / MAMR元件与介质之间的间隙。 操作参数包括间隙，注入到TAMR / MAMR元件的电流量和/或写入电流。

    Seek distance dependent variable max VCM seek current to control thermal rise in VCM's
    2.
    发明授权
    Seek distance dependent variable max VCM seek current to control thermal rise in VCM's 有权
    寻找距离因变量最大VCM寻找电流来控制VCM中的热上升

    公开(公告)号：US06724564B1

    公开(公告)日：2004-04-20

    申请号：US09728630

    申请日：2000-11-30

    申请人： Raffi Codilian ,  David D. T. Nguyen ,  David L. Whitaker

    发明人： Raffi Codilian ,  David D. T. Nguyen ,  David L. Whitaker

    IPC分类号： G11B5596

    CPC分类号： G11B5/5526 ,  G11B5/59605

    摘要： A disk drive and methods for preventing a coil in a voice coil motor from overheating due to the application of excess current. The disk drive comprises a servo control system. The servo control system is adapted for applying a current to a coil of the voice coil motor thereby causing the voice coil motor to move the head according to a seek distance. The servo control system generates a plurality of seek profiles for each of a plurality of seek distances and a plurality of current limits for the plurality of seek profiles. Each of the plurality of seek profiles defines a plan for controlling the current to be applied to the coil while the voice coil motor is operated over the seek distance. The plurality of current limits each define a maximum current allowed while controlling the current to be applied to the coil.

    摘要翻译： 一种磁盘驱动器和用于防止音圈电机中的线圈由于施加过电流而过热的方法。 磁盘驱动器包括伺服控制系统。 伺服控制系统适用于向音圈马达的线圈施加电流，从而使音圈马达根据搜索距离移动头部。 伺服控制系统针对多个寻道曲线的多个寻道距离和多个电流极限中的每一个生成多个寻道曲线。 多个寻道轮廓中的每一个定义了在音圈马达在寻道距离上操作时控制施加到线圈的电流的平面图。 多个电流限制各自限定允许的最大电流，同时控制施加到线圈的电流。