Abstract
This paper proposes a new robust feedforward 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 control whose error is less than 0.1 /spl mu/m for a position reference with amplitude of 100 /spl mu/m. For this purpose, optical disk recording systems should be regulated by feedforward control and robust control. However, the detection signal is only a error and the position reference cannot be obtained. Therefore, this paper proposes a new estimation method of the position reference by using only error, and realizes a quick and precise control based on feedforward control and robust control.
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