Disk drive with voice coil motor rise time manager,申请号US19970994475-传众专利搜索

Disk drive with voice coil motor rise time manager

申请公布号：US6122135(A)

申请号：US19970994475

申请日期：1997.12.19

申请公布日期：2000.09.19

申请人：

WESTERN DIGITAL CORPORATION

发明人：STICH, MICHAEL CHARLES

分类号：G11B5/596;(IPC1-7):G11B5/596

主分类号：G11B5/596

摘要：A method to adaptively reduce error introduced by the coil current rise time. A disk drive with a moving arm actuator driven by a voice coil motor is controlled by periodically modeling the coil current rise time. An adjustment to a commanded current value is based on the model of the coil current rise time and a magnitude change in commanded value. The model of the coil current is based on a linear approximation to the exponential rise time of the coil current. The commanded value is adjusted to compensate for the error in the control effort. For small commanded value differences no compensation is made for the coil current rise time. For medium command value differences a slope intercept equation is used to compute the compensated commanded value. For large commanded value differences half of an estimate of the maximum largest physical current change is used. The adjustment is made by the estimator in a position error signal feedback control system. The voice coil rise time adjustment is made to a voice coil motor control signal. The actuator velocity estimate is also improved with the model of the coil current rise time.