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    Head polarity detection algorithm and apparatus
    5.
    发明授权
    Head polarity detection algorithm and apparatus 失效
    磁头极性检测算法和装置

    公开(公告)号：US07133227B2

    公开(公告)日：2006-11-07

    申请号：US10761475

    申请日：2004-01-21

    申请人： TaiVie Chiang ,  WingKong Chiang ,  KianKeong Ooi ,  KianSoon Yeo ,  MingZhong Ding

    发明人： TaiVie Chiang ,  WingKong Chiang ,  KianKeong Ooi ,  KianSoon Yeo ,  MingZhong Ding

    IPC分类号： G11B27/36

    CPC分类号： G11B27/36 ,  G11B5/455 ,  G11B20/10009 ,  G11B2005/001 ,  G11B2005/0013 ,  G11B2220/20

    摘要： A method of determining and monitoring head polarity of data heads comprises performing a head polarity detection routine. The head polarity detection routine comprises the step of setting a read gate period duration to a first value. The routine also comprises searching for a good address mark signal during a first read gate period with a channel polarity set to a first polarity. The routine further comprises identifying a polarity of a data head based upon the channel polarity when the good address mark is detected.

    摘要翻译： 确定和监视数据头的磁头极性的方法包括执行磁头极性检测程序。 磁头极性检测程序包括将读门限周期设定为第一值的步骤。 该例程还包括在第一读取门限周期期间搜索良好的地址标志信号，其中通道极性被设置为第一极性。 该例程还包括当检测到良好地址标记时，基于信道极性识别数据头的极性。

    Method and apparatus for handling multiple resonance frequencies in disc drives using active damping
    7.
    发明授权
    Method and apparatus for handling multiple resonance frequencies in disc drives using active damping 有权
    用于使用主动阻尼处理磁盘驱动器中的多个共振频率的方法和装置

    公开(公告)号：US06690534B2

    公开(公告)日：2004-02-10

    申请号：US09827339

    申请日：2001-04-05

    申请人： MingZhong Ding ,  YangQuan Chen ,  LeeLing Tan ,  Wing Kong Chiang ,  KianKeong Ooi ,  BengWee Quak

    发明人： MingZhong Ding ,  YangQuan Chen ,  LeeLing Tan ,  Wing Kong Chiang ,  KianKeong Ooi ,  BengWee Quak

    IPC分类号： G11B5596

    CPC分类号： G11B5/5582

    摘要： A method of handling multiple resonance frequencies in a disc drive includes monitoring a position error signal (PES) for an actuator arm, generating a plurality of feedforward compensation signals from the PES using a plurality of bandpass filters, and applying the compensation signals to a servo control signal. Each filter has a center frequency that is set to a problematic resonance frequency. The method may also include identifying the problematic frequencies by, for example, commanding a movement of the actuator arm, collecting data points for the PES that are associated with the movement, and performing a digital fourier transform of the data points to identify resonant frequencies. Other methods of identifying problematic frequencies include analyzing PES zero-crossing data, or using principal component analysis.

    摘要翻译： 一种在盘驱动器中处理多个共振频率的方法包括监视致动器臂的位置误差信号（PES），使用多个带通滤波器从PES产生多个前馈补偿信号，并将补偿信号施加到伺服 控制信号。 每个滤波器的中心频率被设置为有问题的共振频率。 该方法还可以包括通过例如指令致动器臂的移动来收集有问题的频率，收集与移动相关联的PES的数据点，以及执行数据点的数字傅里叶变换以识别共振频率。 识别有问题频率的其他方法包括分析PES过零数据，或使用主成分分析。

    Electrical phase compensation in BEMF spindle motor control
    10.
    发明授权
    Electrical phase compensation in BEMF spindle motor control 有权
    BEMF主轴电机控制中的电相补偿

    公开(公告)号：US07170249B2

    公开(公告)日：2007-01-30

    申请号：US11312052

    申请日：2005-12-20

    申请人： June Christian Ang ,  KianKeong Ooi ,  WingKong Chiang ,  MingZhong Ding

    发明人： June Christian Ang ,  KianKeong Ooi ,  WingKong Chiang ,  MingZhong Ding

    IPC分类号： G05B11/01 ,  G11B7/00

    CPC分类号： G11B19/28 ,  H02P6/182

    摘要： A method and apparatus for compensating for the asymmetrical phases of a spindle motor in a disc drive are provided. With the apparatus and method, compensation values are learned by sampling speed data during a period of operation of the disc drive where the speed is stable and only one control operation is performed per revolution of the disc. The sampled speed data is used to generate the compensation values for each of the phases of the spindle motor. The compensation values are stored in a compensation mechanism which is used by the spindle motor speed controller to provide compensation for the asymmetrical phases of the spindle motor. During Normal operation, the actual speed output of the spindle motor is measured and is subtracted from a reference speed to generate a difference speed value. Based on the corresponding electrical phase, the correct compensation value is fetched and is subtracted from the difference speed value to obtain a compensated difference speed value. A control signal based on this compensated difference speed value is generated and provided to the spindle motor to thereby control the output speed of the spindle motor.

    摘要翻译： 提供了用于补偿磁盘驱动器中的主轴电动机的非对称相位的方法和装置。 利用该装置和方法，在速度稳定的盘驱动器的操作周期期间通过采样速度数据来学习补偿值，并且每一周只执行一次控制操作。 采样速度数据用于产生主轴电机各相的补偿值。 补偿值存储在主轴电机转速控制器使用的补偿机构中，为主轴电机的非对称相提供补偿。 在正常运行期间，主轴电机的实际速度输出被测量，并从参考速度中减去以产生差速值。 基于对应的电相，取出正确的补偿值，并从差速值中减去以获得补偿差速值。 产生基于该补偿差速值的控制信号，并提供给主轴电动机，从而控制主轴电动机的输出速度。