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Robust feedforward tracking servo system for optical disk recording system

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6 Author(s)
K. Ohishi ; Dept. of Electr. Eng., Nagaoka Univ. of Technol., Niigata, Japan ; K. Kudo ; Y. Hayakawa ; H. Yanagisawa
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This paper proposes a new robust feedforward tracking control system for optical disk recording system, which is based on both "zero phase error tracking" (ZPET) control and a robust feedback control using disturbance observer and coprime factorization. Optical disk recording systems must have a quick and precise tracking control whose error is less than 0.1 μm for a position reference with amplitude of 100 μm. For this purpose, optical disk recording systems should be regulated by feedforward control and robust control. However, the detection signal is only a tracking error and the position reference cannot be obtained. Therefore, this paper proposes a new estimation method of the position reference by using only tracking error, and realizes a quick and precise tracking control based on feedforward control and robust control

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Industrial Electronics Society, 2001. IECON '01. The 27th Annual Conference of the IEEE  (Volume:3 )

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