A NEW TRACKING SYSTEM FOR MAGNETOOPTICAL DISK DRIVES .2. ANALYSIS ANDSERVO SYSTEM

To reduce the average accessing time of a magneto-optical (MO) disk dr ive, which is a severe drawback of current products, a newly developed moving-magnet type tracking actuator has been designed and tested. Th e effort of developing a fast positioning actuator is divided into two parts. One is to develope a new driving mechanism having a fast track ing capability and the other is to adopt an advanced control scheme. I n this work, the second effort is mainly addressed using a hybrid cont rol and adaptive model-following control.