| Summary: | 碩士 === 崑山科技大學 === 電機工程研究所 === 98 === n the process of production automation, it is very frequently to transport the products to the fixed position by the conveyer belt. However, in the course of conveying, the conveyer belt may be the reason of degradation or wearing and tearing for a long time that causes the products unable to accurately transport to the fixed position. To improve this problem, this thesis proposes an effective method for position control of servo motor based on programmable logic controllers (PLC). The PLC-based motor control technique has the advantages of good operation quality and superior control performance during on-off instant. Hence, provided that it is the general purpose of motor drive and control, the industrial circles are used to utilize the PLC-based control method to substitute for the traditional driving technique, simplify the control circuit components, and satisfy the control requirements. In addition to the existing inner-loop PID controller, this thesis develops an outer-loop fuzzy controller to modify the conveyer belt position once the position of conveyer belt shifts from the original position. The fuzzy theory adopts the human language to replace the complicated mathematics model. For a highly non-linear system or in which the differential equation is not easy to be obtained, the fuzzy controller can offer a simpler control method. The experiment results show the proposed method can improve the problem of position deviation for any conveyer belt systems.
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