磁头面内运动的测量与抑制

Measurement and Suppression of Slider In-Plane Motion

为了进一步提高读写头的定位精度,实验研究了磁头稳定飞行时的面内运动.在将主轴系统与磁头加载机构分离开后,利用激光多普勒测振仪测量磁头面内运动和盘片偏摆大小,通过幅值谱对测量信号进行频谱分析,讨论了面内运动与盘片偏摆的相关性.结果表明,磁头面内运动主要是由盘片偏摆引起的,其运动幅值与盘片偏摆的幅度呈正相关,当偏摆幅值从6.962 4μm减小到3.333 0μm时,偏离磁道方向的运动振幅从140.6 nm降低到59.1 nm.通过抑制盘片的偏摆幅度可以有效地抑制磁头偏离磁道方向的运动幅值,有助于提高磁头定位的精确度.

In order to position the read/write elements more precisely,the in-plane motion of a flying slider was investigated experimentally.After the spindle and the slider load/unload device were kept apart,a laser Doppler vibrometer was used to measure the in-plane motion of the slider and the disk runout,and then the results were analyzed in frequency domain in the form of amplitude spectrum.The correlation between the in-plane motion of the slider and the disk runout was also discussed.As the results indicate,the in-plane motion of the slider is mainly caused by and thus has positive correlation with disk runout.The amplitude of the offtrack in-plane motion was decreased from 140.6 nm to 59.1 nm when the runout amplitude was reduced from 6.962 4 μm to 3.333 0 μm.By suppressing the disk runout,the offtrack motion of the slider can be suppressed effectively,which is beneficial for improving the precision of positioning the slider.