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자기 부상 액츄에이터용 전류 피드백 선형 Amp. 의 설계
양주호(J. H. Yang),정황훈(H. H. Jeong),김영완(Y. W. Kim),김영복(Y. B. Kim),정광교(G. G. Jeong) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
MLS(Magnetic Levitation System) is the plant that studied a lot because it hasn't only disadvantage like nonlinearity, un stability, high price but also has advantage like low fiction, low noise, low heat generating as one of discontacted mechanical elements. This MLS uses electric or permanent magnet actuator to levitate the object stably. Therefore actuator's design could be a large part in MLS' s constitution. MLS's magnetic attraction force proportionate with square of its current. This current in electronic magnet's coil affect directly at the its attraction force. So actuator that made electric magnet's coil magnetize has current feedback. And the power amplifier can sort like PWM type or linear one. Generally PWM type actuator has advantage that get a low power loss but it's application circuit can become confusing. And it also has noise generating possibility. This study consider about design for MLS's capacity and actuator's one. And then we try to design for feasible linear actuator which used bipolar junction transistor with current feedback in MLS.
양주호(J. H. Yang),정황훈(H. H. Jeong),최교호(G. H. Choi),정광교(G. G. Jeong) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
F-NFS is that fuzzy inference based Neuro-Fuzzy System. It take aim at intelligently system model that can do learning, reasoning, memorizing and recognizing as human's thinking action. But F-NFS couldn't use learning rule to study learning set for neural network. Because it had structural fuzzy inference part. This study consider about F-NFS's learning method with GA. It take aim at learning F-NFS without any special learning method. And it also can deduce inference part from learning set, neural network's weighting matrix, bias matrix.
양주호(J. H. Yang),정황훈(H. H. Jeong),정광교(G. K. Choung) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
The magnetic bearing system is widely applied to the suspension of rotors on the rotary machineries at the special condition, because this system has many advantages such as less mechanical friction and heat generation, no noise, no lubrication and so on. The magnetic bearing system is inherently an unstable system, so this system needs the controller to stabilize the system. Many studies are devoted to the design of controllers that make the system stabilize and the analysis that finds the system's dynamic characteristics. This paper concern about the PID controller that stabilized the magnetic bearing system with control signal separating. Firstly, we already get the transfer function for the current amplifier's circuit form amp. input to current output and the magnetic baring system from reference input to levitated object's displacement. Secondly we will experiment on the magnetic bearing system that separate the control signal or not with the step response experiment and the step disturbance one. And we will compare the response experiments between the magnetic bearing system with control signal separating or not. Finally, we will confirm the system that separated control signal is better disturbance rejection and the reference tracking performance than the system didn't separated.
홀 효과 소자를 이용한 미소 변위 측정 장치에 관한 연구
양주호(J. H. Yang),손수강(S. K. Son),정황훈(H. H. Jeong),정광교(G. G. Jeong) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The sensor which is the indispensable element for the protection of the human being, the safety and the convenience has the faculty of the measurement measuring the physical and chemical quantity of every kinds in the role of a protection of a guard, the faculty of artificial sensation expanding and supplementing the control faculty to actualize the automatic industrial, and above all the perception faculty of the six sense superior to five senses. The sensor like this measures by accepting every signal from the external world and changes it into the convenient electric signal. When a solid of a metal or a semiconductor etc. in the magnetic field is put and an electric current in it at a right angle to the direction of magnetic field is sent, it is called as the hall voltage - a phenomenon that the electric field in it at a right angle to each direction appear the electric field. When the phenomenon that this hall voltage come out is called as the hall effect, the sensor using this phenomenon is called as the hall sensor.