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公开(公告)号：US5946158A
公开(公告)日：1999-08-31
申请号：US893815
申请日：1997-07-11
申请人： Ara W. Nazarian , Thao P. Trieu , Richard K. Wong
发明人： Ara W. Nazarian , Thao P. Trieu , Richard K. Wong
CPC分类号： G11B5/59683 , G11B5/5534 , G11B5/59688
摘要： The invention is a method of calibrating a position error signal (PES) to overcome the problem of a measured displacement or PES that varies as a non-linear function of real displacement when the read transducer is positioned to either side of a null position where the PES equals zero. The PES is notably nonlinear while reading servo burst information with a Magneto-Resistive (MR) head which has nonlinear magnetic characteristics. The method uniquely calibrates the measured PES to provide a corrected PES without requiring any knowledge of the actual displacement from the position where the measured PES equals 0. The calibration according to this method, therefore, may be performed at anytime without need for real displacement information from a servowriter or any sort of special calibration track. The method involves positioning the MR head to a plurality of predetermined, measured displacements corresponding to partial track increments of real displacement of unknown magnitude on either side of the null position, measuring a PES gain value at each of the plurality of measured displacements, and then correcting subsequent measured displacements based on the plurality of measured displacements and corresponding PES gain values. The correcting step is preferably accomplished by using the measured displacements and corresponding PES gain values to establish coefficients of a correction function c(y) which substantially provides unity gain relative to real displacement over a limited range of measured displacements. The preferred correction function c(y) is a partial sum Fourier series.
摘要翻译： 本发明是一种校准位置误差信号（PES）的方法，以克服当读取换能器位于空位置的任一侧时作为实际位移的非线性函数而变化的测量位移或PES的问题，其中， PES等于零。 在具有非线性磁特性的磁阻（MR）磁头读取伺服脉冲串信息时，PES是非常非线性的。 该方法唯一地校准测量的PES以提供校正的PES，而不需要从测量的PES等于0的位置的实际位移的任何知识。因此，根据该方法的校准可以在任何时间执行而不需要实际位移信息 从伺服器或任何一种特殊的校准轨道。 该方法包括将MR头定位到对应于零位置的任一侧的未知幅度的实际位移的部分轨迹增量的多个预定的测量位移，测量多个测量位移中的每一个处的PES增益值，然后 基于多个测量位移和相应的PES增益值来校正随后的测量位移。 校正步骤优选地通过使用测量的位移和相应的PES增益值来实现，以建立校正函数c（y）的系数，其基本上在有限的测量位移范围内提供相对于实际位移的单位增益。 优选的校正函数c（y）是部分和傅里叶级数。
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公开(公告)号：US4866554A
公开(公告)日：1989-09-12
申请号：US224077
申请日：1988-07-25
摘要： An automatic head retract system for a disk drive. The system operates in response to electric power turn off to retract the heads to a landing zone on the disk surface. The heads are retracted by operating a positioner motor under the control of logic internal to the disk drive unit without intervention by a host computer. The positioner motor comprises a multiphase DC brushless motor which, after power loss, is supplied with current from a capacitor charged during normal drive usage, and by the back EMF of a spindle motor. A latch mechanically locks the heads in the landing zone.
摘要翻译： 一种用于磁盘驱动器的自动磁头缩回系统。 该系统响应于电力关闭而操作，以将磁头缩回到盘表面上的着陆区。 在通过主机计算机的干预的情况下，通过在磁盘驱动器单元内部的逻辑控制下操作定位器电动机来使磁头缩回。 定位电动机包括一个多相直流无刷电动机，在断电后，从正常驱动使用期间充电的电容器和主轴电动机的反电动势供给电流。 闩锁将头部机械地锁定在着陆区域。
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公开(公告)号：US4786995A
公开(公告)日：1988-11-22
申请号：US927916
申请日：1986-11-06
CPC分类号： G11B19/2081 , G11B21/12
摘要： An automatic head retract system for a disk drive is disclosed which operates in response to electric power turn off to retract the heads to a landing zone on the disk surface. The heads are retracted by operating a positioner motor under the control of logic internal to the disk drive unit without intervention by a host computer. The positioner motor comprises a multiphase DC brushless motor which, after power loss, is supplied with current from a capacitor charged during normal drive usage and by the back EMF of a spindle motor. A latch mechanically locks the heads in the landing zone.
摘要翻译： 公开了一种用于磁盘驱动器的自动磁头缩回系统，其响应于电力关闭而操作，以将磁头缩回到盘表面上的着陆区域。 在通过主机计算机的干预的情况下，通过在磁盘驱动器单元内部的逻辑控制下操作定位器电动机来使磁头缩回。 定位电动机包括一个多相直流无刷电动机，在断电后，从正常驱动使用期间充电的电容器和主轴电动机的反电动势供给电流。 闩锁将头部机械地锁定在着陆区域中。
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