Abstract
A design method using a virtual resounant mode in the head-positioning systems of hard disk drives was developed. The virtual resonant mode is a digital filter that works like a mechanical resonant mode. In conventional control systems, it is difficult to compensate for the disturbance over the first-order mechanical resonant frequency. By using the proposed method, stable resonant modes in the control system can be designed with accuracy and it can decrease the disturbances above the first-order mechanical resonance. Application of this method to an actual hard disk drive showed that it can greatly decrease the disturbance in which the frequency is higher than first-order mechanical resonance.
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