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Microactuator control for disk drive

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6 Author(s)
K. Takaishi ; File Memory Lab., Fujitsu Labs. Ltd., Atsugi, Japan ; T. Imamura ; Y. Mizoshita ; S. Hasegawa
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The nonlinear response of a conventional actuator which depends on the ball-bearing friction is the main factor for determining the high track density of hard disk drives. We cannot get enough servo loop gain in the low-frequency region with a conventional single actuator because of its hysteresis characteristics. We have developed a new planar piezoelectric microactuator which is lightweight and applicable for a hard disk drive. Also we introduced a two-stage servo controller and realized a high servo bandwidth over 1 kHz and enough tracking-error reduction in the low-frequency region

Published in:

IEEE Transactions on Magnetics  (Volume:32 ,  Issue: 3 )