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Currently, a high-precision tracking control system is needed for large-capacity optical disc drive system. This paper proposes a new full field-programmable gate array (FPGA) tracking control system based on an Error-Based Communication Disturbance Observer (ECDOB) with consideration of a time delay of the optical disc drive system. The FPGA control system sometime has a large influence on both the...
This paper compares performance of a double feedforward control system that considers for time delay. Recently, digital content size continues to increase. In order to cope, manufacturers of digital storage media try to increase capacity by narrowing the track pitch of these digital storage media. This digital controller designs and implements in a Field-Programmable Gate Array (FPGA). However, the...
Recently, the data size of digital content has increased. In order to cope, manufacturers have tried to increase capacity by narrowing the track pitch of digital storage media. In addition, recent advancements in technology have resulted in a new optical disc that has a rotation speed of over 15,000 rpm. Considering all these factors, a high-precision pick-up control system is needed for optical discs...
Recently, the size of digital content has continued to increase. In order to cope, manufacturers of digital storage media have tried to increase capacity by narrowing the track pitch of these digital storage media. In addition, recent advancements in technology have resulted in a new optical disk has a rotation speed of over 15,000 rpm. Considering all these factors, we believe that a high-precision...
Pickup systems for optical disks operate in the horizontal and vertical directions for tracking and focusing, respectively. Control systems for optical disks consist of focusing control and tracking control for each operation direction. Therefore, this paper proposes a new minimum tracking & focusing trajectory control based on two-dimensional feedforward control system. Two-dimensional feedforward...
In the robot systems and intelligent machines, the gear-box or mechanisms are connected with the motor to transmit the actuator torque to a distant joint. Generally, its elasticity causes resonance frequency in the system. By using the conventional PID controller, this method cannot perform well in this situation. Much research has proceeded with the aim of reducing vibration. A new effective control...
Recently, the size of digital content has continued to increase; therefore digital storage media have been required to increase capacity by narrowing the track pitch and the gap length between the optical head and the disk. On the other hand, anew optical disk has achieved a rotation speed of over 15,000 rpm. To meet these demands, several control systems for optical disks are proposed to achieve...
Recently, on the view point of capacity of memory, the media of optical disk recording system is increasing. Moreover, its disk rotation speed will be increasing according to its large memory capacity, such as more than 10000[rpm]. The optical disk system has a radial run-out originate from the disk eccentricity. For this reason, the optical disk system has the periodic disturbance which is synchronized...
This paper proposes a new tracking control system for high speed optical disk recording system. The proposed tracking control system consists of triple compensation loops of tracking error which are the robust feedback control loop, Zero Phase Error Tracking (ZPET) feedforward control loop and a new additional DC offset compensation loop. The feedback controller is the most inner loop which is based...
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