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정민채(Min-Chae Jung),윤상길(Sang Gil Yoon),윤동진(Dong Jin Yoon),서정세(Jeong-Se Suh) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.4
In this study, the temperature distribution and heat transfer characteristics of each component in a solenoid motor system were numerically investigated when heat is generated by the steel pad attached to the solenoid ring of the motor. It was found that the internal airflow was complicated by the inflow velocity of air and the rotation of guide rollers and solenoid rings. Based on the numerical results, the tendency for temperature changes in the steel panel was lower due to the contact of the cooling air in the front in the rotational direction, and the peak temperature was at the front of the center. In particular, it was confirmed that as the air inflow rate was increased, the temperature was reduced due to strong convection. The temperature of the iron plate pad was decreased as the convective heat transfer coefficient was linearly increased with increasing airflow around the solenoid ring. In addition, the temperature of the iron plate panel was rapidly increased with increasing heat generation.
코일 저항의 불확실성을 가지는 자기 부상 시스템의 강인 제어
정민길(Min-Gil Jeong),최호림(Ho-Lim Choi) 대한전기학회 2015 전기학회논문지 Vol.64 No.7
Electromagnetic levitation system(EMLS) is one of the well known nonlinear systems due to its high degree of nonlinearities. Moreover, when there are uncertain parameters in EMLS, it is not easy to have an accurate control of EMLS. In this paper, we first apply a standard input-output feedback linearzing controller to EMLS and investigate the possible control error caused by uncertain coil resistor. Then, as a remedy, we design and apply a robust controller using Lyapunov redesign technique to deal with this uncertain coil resistor in the system. The validity of our robust controller is verified via system analysis and experimental results.
자코비안 선형화 및 입-출력 궤환 선형화에 기반한 자기 부상 시스템의 스위칭 제어
정민길(Min-Gil Jeong),최호림(Ho-Lim Choi) 대한전기학회 2015 전기학회논문지 Vol.64 No.4
Electromagnetic levitation system(EMLS) is one of the well known nonlinear systems. Often, it is not easy to control an EMLS due to its high nonlinearity. In this paper, we first apply two linearization method(jacobian and input-output feedback linearization) to design two feedback controllers for an EMLS. Then, by observing the advantages of each controller, we design a switching control algorithm which engage two controllers depending on the position of the steel ball in order to achieve the improved performance over each controller. The validity of our switching control approach is verified via both simulation and actual experimental results.
이경태,정민길,최호림,Lee, Kyung-Tae,Jeong, Min-Gil,Choi, Ho-Lim 대한전기학회 2017 전기학회논문지 Vol.66 No.1
We propose a switching control scheme for the control of a ball and beam system. It was reported in [4] that a ball and beam system is a nonlinear system which has an ill-defined relative degree. So, the traditional control approaches have been mostly either Jacobian-based control or approximate input-output linearized control in nature. In this paper, motivated by [7], we combine these two traditional control approaches and operate each controller via a pre-designed switching logic so that the improved control result can be obtained without any excessive use of control input. Switching algorithm is developed based on both analysis and actual experimental observation. We verify the effectiveness of our proposed controller via actual experimental results.
이경태(Kyung-Tae Lee),정민길(Min-Gil Jeong),최호림(Ho-Lim Choi) 대한전기학회 2017 전기학회논문지 Vol.66 No.2
We propose a switching control scheme for the control of a ball and beam system. It was reported in [4] that a ball and beam system is a nonlinear system which has an ill-defined relative degree. So, the traditional control approaches have been mostly either Jacobian-based control or approximate input-output linearized control in nature. In this paper, motivated by [7], we combine these two traditional control approaches and operate each controller via a pre-designed switching logic so that the improved control result can be obtained without any excessive use of control input. Switching algorithm is developed based on both analysis and actual experimental observation. We verify the effectiveness of our proposed controller via actual experimental results.