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A design method of a multi-rate servo controller using H

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1 Author(s)
Semba, T. ; IBM Tokyo Res. Lab., Yamato-Shi, Japan

A method of designing a multi-rate servo controller for a HDD that operates at a higher sampling frequency than that of the position error signal (PES) is proposed. Multi-rate sampling has an advantage for increasing the track density of a HDD without increasing the overhead of the servo information on the disk. A plant model for a design with a higher sampling rate is obtained by adding a zero-interpolator at the output of the position error signal. The controller is calculated by the H∞ method to suppress the noise at the PES sampling frequency that is created by the use of multi-rate sampling. The servo bandwidth and margins of the method are studied for 2.5" and 3.5" HDDs, and for an HDD with a dual-stage actuator. The multi-rate sampling is especially effective for the dual-stage actuator because the MEMS actuator's transfer function is very clean

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Magnetics, IEEE Transactions on  (Volume:36 ,  Issue: 5 )