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최성대,김낙교 대한전기학회 2005 전기학회논문지 D Vol.54 No.7(D)
In order to realize the speed control of an induction motor, the information of the rotor speed is needed. So the speed sensor as an encoder or a pulse generator is used to obtain it. But the use of speed sensor occur the some problems in the control system of an induction motor. To solve the problems, the appropriate speed estimation algorithm is used instead of the speed sensor. Also there is the limitation to improve the speed control performance of an induction motor using the existing speed estimation algorithm. Therefore, in this paper, intelligent speed estimator using Fuzzy-Neural systems as adaptive laws in Model Reference Adaptive System is proposed so as to improve the existing estimation algorithm and ,using the rotor speed estimated by the proposed estimator, the speed control of an induction motor without speed sensor is performed. The computer simulation and the experiment is executed to prove the performance of the speed control system using the proposed speed estimator.
A Study on Module Design of Field Customization for Food Packaging System
최성대,임병남,이승진,김기만 한국기계가공학회 2023 한국기계가공학회지 Vol.22 No.4
A food-packaging system consists of a box former, case packer, and taping machine. The need for food-packagingfacilities is increasing, and the demand for factory automation has increased with advances in robot technology. However, current food-packaging systems suffer from incompatibility and high costs. These issues have made itdifficult for many companies to adopt these systems. This vicious cycle slows the pace of industrial growth. Tosolve this problem, it is necessary to design an optimal machine process and modularize the machine to establish amore efficient system. In this study, the structure of the food-packaging system was simplified and made compatible,enabling companies to utilize it efficiently and reducing modularity and price.
퍼지 제어기를 이용한 영구자석 교류전동기의 센서리스 속도제어
최성대,고봉운,김낙교 대한전기학회 2004 전기학회논문지 D Vol.53 No.6(D)
This paper proposes a speed estimation method using FLC(Fuzzy Logic Controller) in order to realize the speed control of PMAM(Permanent Magnet AC Motor) with no speed sensor. This method uses FLC as a adaptive laws of MRAS(Model Reference Adaptive System) and estimates the rotor speed of PMAM with a difference between the reference model and the adjustable model. Speed control is performed by PI controller with the estimated speed . The experiment is executed to verify the propriety and the effectiveness of the proposed system.
해양구조물 TMCP강의 피로균열진전거동에 미치는 용접이방성 및 과대하중의 영향
최성대,이종형,三澤啓志 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.6
The effect of the welding for the offshore structure in the TMCP steel on the fatigue crack propagation rate and crack opening-and-closure behavior was examined. The welding anisotropy of the TMCP steel and crack propagation character-istics of the excessive loading were reviewed (1) It seemed that a heat which was generated by the welding made a compressive residual stress over the base metal, so fatigue crack propagation rate was placed lower than in case of the base metal. (2) In the base metal, an effect of the anisotropy which has an effect on fatigue crack propagation rate of the excessive load and the constant amplitude load was not found but in the welding material case, fatigue crack propagation rate of the excessive load in the specimen of the width direction was located in the retard side as compared with a specimen rolling direction. (3) A crack opening ratio of the used TMCP steel in this study was not changed after excessive loading but a retard phe-nomenon of crack propagation was observed. Consequently, it was thought that all of the retard phenomenon of crack propagation did not only a cause of the crack opening-arid-closure phenomenon.