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

被引：4
|
作者：
Semba, T [1 ]
机构：
[1] IBM Corp, Tokyo Res Lab, Yamato 2428502, Japan
来源：
IEEE TRANSACTIONS ON MAGNETICS | 2000年 / 36卷 / 05期
关键词：
DAC; estimator; HDD; interpolator; PES; predictor;
D O I：
10.1109/20.908367
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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-infinity 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 " HDD's, and for a HDD with a dual-stage actuator. The multi-rate sampling is especailly effective for the dual-stage actuator because the MEMS actuator's transfer function is very clean.
引用
收藏
页码：2219 / 2221
页数：3
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