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Since the record density of hard disk drive (HDD) increased very rapidly, the required servo accuracy is getting dramatically severe. In this paper, novel feedforward (FF) control is proposed to reject the periodic disturbance based on switching scheme and open-loop observer. The advantage of proposed method is that periodic disturbance can be rejected without sacrifice of feedback performance. Several experiments are carried out to verify the control performance. First, the proposed FF method is compared with the conventional feedback (FB) control in the case of single-mode disturbance rejection. Second, multiple-mode disturbance is considered in high-frequency region which cannot be rejected by conventional technologies. The final experiments show that 20.4[%] tracking error is reduced by the proposed control algorithm.

Periodic Disturbance Rejection Control of HDD Based on Observer and Switching Mechanism