• Title/Summary/Keyword: Arago Disc System

Search Result 2, Processing Time 0.042 seconds

Determining of the Sampling Time and Adjusting PID Coefficients in a Discrete System (이산 시스템에서 샘플링 시간의 설정 및 PID 계수 조정)

  • Choi, Goon-Ho
    • Journal of the Semiconductor & Display Technology
    • /
    • v.16 no.4
    • /
    • pp.46-51
    • /
    • 2017
  • Recent controller design techniques often discretize the target system and implement a discrete controller that is digitized to match the target system. When constructing such a discrete system, it is necessary to first determine the sampling time. The smaller the sampling time is, the more advantageous it can be made similar to the original system, but the cost is a problem when realizing such a configuration as hardware. On the other hand, the longer the time, the more different the system is from the original system, and eventually the control becomes impossible. In this paper, we consider the above problem and propose a more logical approach to determine the sampling time in the discrete system and investigate the relation with the differential controller. We also apply this process to a nonlinear system called ARAGO disc and verify its validity through computer simulation.

  • PDF

Distributed Control of the Arago's Disc System with Gain Scheduler

  • Ibrahim, Lateef Onaadepo;Choi, Goon-Ho
    • Journal of the Semiconductor & Display Technology
    • /
    • v.16 no.3
    • /
    • pp.25-30
    • /
    • 2017
  • Arago's disk system consists of a speed controller of the DC motor (inner loop controller) and a position controller of the magnetic bar angle (main controller), which are implemented by the design of the PI and PID controller, respectively. First, we analyzed the nonlinear characteristics of the Arago disk system and found the operating point range of three locations as a result. In this paper, a gain scheduler method was applied to guarantee a constant control performance in the range of $0{\sim}130^{\circ}C$, and a structure to change the controller according to the control reference value based on the previously obtained operating points was experimentally implemented. The Distributed Control Systems (DCS) configuration using the Controller Area Network (CAN) was used to verify the proposed method by improving the operational efficiency of the entire experimental system. So, simplicity of the circuit and easy diagnosis were achieved through a single CAN bus communication.

  • PDF