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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...
In the recent times, the number of amateur farmers has been increasing. Although amateur farmers use tillers, they may find it difficult to drive the tiller along a straight line. There is a need for electric tillers with independent drive wheels. This paper proposes straight control incorporating human driving input by using a disturbance observer. Numerical simulation results and experimental results...
This paper proposes a frequency separation type current control system for a grid-connected single-phase five-level inverter. The proposed control system realizes high tracking performance and high disturbance suppression performance. To obtain high tracking performance to the sinusoidal reference signal, a repetitive controller is applied to the current controller. The current controller with a repetitive...
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...
This paper describes a control method for the self-sustained operation of a photovoltaic (PV) generation system to compensate the output voltage distortion compensation. In order to improve the output voltage distortion, the control circuit consists of sinusoidal tracking control based on the internal model principle. Moreover, the control system is configured by combining the sinusoidal tracking...
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...
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...
Recently, a container crane is requested to operate smoothly and quickly. For this purpose, the control system of container crane should have an anti-sway control technique to suppress its vibration phenomenon. A vision sensor system to detect the sway angle is often used. However, since the control system with vision sensor has the delay time in detection, it sometimes has the deterioration of control...
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