LIAPUNOV函數에 의한 同期電動機의 동기인입현상 解析

우정인,이준탁,윤병도 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.2

A synchronous motor started as an induction motor must be synchronized as soon as possible by the application of field at any point. Unfortunately, the dynamic motion equations, describing the synchronized process, that is, describing the pulling-into-step process, are represented by complicate and nonlinear differential equations which have no analytical techniques. However, practical criteria for predetermining with adquate accuracy whether a given motor will or will not pull into step under specified conditions, must be necessarily given. Futhermore, it is impossible to obtain the accurate solution of the closed form by conventional techniques. Even though they are obtained, they does not show the stable regions over 4 quadrants. Specially, the accurate observations about the continuous variations of slip and load angle are very important for the stablized control of synchronous motor and all systems with them. The abnormal and unstable operations such as hunting pulling out and etc. are fatal to the life of machine itself and all systems with them. Therefore, in this paper, the stable regions in the sense of strictness over 4 quadrants, the analytical and the experimental techniques, for cylindrical synchronous motor are introduced in detail. These techniques used in this paper are based on the construction and analysis of Liapunov function, derived from the Lagrange-Char-pit method which is one of the solution techniques for partial differential equations. The theory of the various stable regions and optimal points for applications of field, which can be predicted the success or the failure of pulling-into-step under the variations of load ratio and damping ratio is presented and also is proved by experimental results.

2次 近似에 의한 D·C 電動機의 速度 및 位置豫測 制御에 관한 硏究

禹靖仁,趙顯文 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.1

This paper deal with predict control of speed and position in PID method with microprocessor, and present predict method using the principale of Tayler Series because digital control system based microprocessor have delay time in sampling period. The effect of predict control for speed and position was confirmed through experimental result. It has been redued under 1-degree of position error in breaking by using predict position and straigtaway decelerator In speed control applied predict speed, Overshoot can be reduced under 2%.

마이콤에 의한 小形 펄스모터制御에 관한 硏究

禹靖仁,李浚柝 동아대학교 공과대학 부설 한국자원개발연구소 1982 硏究報告 Vol.6 No.1

Micom is the most powerful and profitable tool for the control of the stepping motor as a small pulse motor. In this paper, it is reported that a series of controll programs, that is, the basic program and the programs for the C. W. and C. C. W. rotations and the limited operations, are developed. And the conclusions through these experiments have been obtained as follows. 1) The drive of the stepping motor is not only excution by Micom pulses, but the finding of the 1 phase, 2phase or 1-2 phase excited output is depended upon the instruction of out port. 2) The sequential control of the exciting phase and the C. W. and C. C. W. rotations of the Rotor through the shifted Accumulator Register inside C P U is excuted easily, and the developements of the control programs and the expansion of the Buffer Memory space make the limited operation and the speed control possible. 3) Ultimately, by the closed loop drive of he stepping motor, when the patterns of the arbitrary selected step accelerations, constant speeds, decelerations and stop are memorized in the Micom Kit, the tracking operation of the open loop drive is possible.

行列多項式 LYAPUNOV 函數 構成에 依한 誘導電動機의 安定度 解析

禹靖仁,李浚柝,文在星 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2

In this paper, when the steady state values for Multidimensional and Nonlinear Dynamic Models of Space Representations are given, Lyapunov functions of scalar types using matrix quadratic polynomials are constructed by Special Matrix Transformation Techniques and applied to Stability Analysis of Induction Motors. Futhermore, Lyapunov function construction procedures for linear systems can be specified in detail. But, unfortunately, for nonlinear systems, there are no the complete construction techniques. Therefore, in this paper, differently from conventional methods using Linearization obtained from Taylor series expansions about steady state operating points, linear terms and nonlinear ones are invidually separated, and by special matrix transformation techniques, similar Lyapunov function construction procedures such as in the cases of linear systems, are introduced, and are applied to Stability Analysis of induction motor. The hyperspaces of multidimensional stability region, obtained from these techniques, were larger than the obtained ones from conventional linearlization techniques about equilibrium points and were assured to be Lyapunov Asymptotic Stability Region ensuring the stable operation of induction motor.

유도전동기의 자속제어형 Inverter에 의한 가변속 운전

이승환,우정인,이준탁 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.2

Many techniques for variable speed drives of induction motor had been introduced. Recently, all of them are replaced by PWM control techniques with transitor inverter. But the troublesome problems appeared in variable speed drives include the determination of PWM switching patterns, the generation of control signals, the minimization of torque pulsation, acoustical noises, mechnical vibrations, harmonics and etc.. Therefore, the pursuits of high performance drives and compactness in control circuits without the aids of micro-computer or micro-processor with the functions of control and simple calculations are impossible. In this paper, one technique for the digital and software processing of all control factors is introduced. The determinations of PWM switching patterns are based on the selection of flux vector equivalent to the integral value of applied voltage during every sampling period. And, the real flux vector is controlled so that the trajectory of it can be tracked to the circularform one of ideal flux vector. Also, introduction of the concept of g-u-w plane from d-p plane make digitization and quantization of all control factors convenient. Specially, the predicted control techniques in selection of differential flux vector, Δλ, have functions which can compensate the delay time due to the micro-processor processing, so the real time control system by 8086 micro-processor, simulation and experimental results are in detail compared each other.

스텝모터의 動特性 解析과 軸應答에 관한 硏究

禹靖仁,趙顯文 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.2

This paper describs the analysis, design, and testing of a stepping motor drive system. The load variation, the characteristics of a driving current delay, or the shaft vibration from the ringing current of a phase transformation induces the step out of synchronism and the reversal of the stepping motor. This paper presents the design aspects of a position control of stepping motor which is fed from pulse generator. Author considered the dynamic characteristics and the computation of electrical constants with stepping motor. As a theoretical bases and a prediction of the experiments, the author considered the dynamic shaft response of stepping motor. Design examples and optimal driving conditions of high efficiency stepping motor are based on the improvement of the shaft vibration.

二電源法에 의한 스�모우터의 토오크 特性改善에 관한硏究

禹靖仁 동아대학교 공과대학 부설 한국자원개발연구소 1982 硏究報告 Vol.6 No.2

By using the one chip, LSI, Micom PPMC101 Stepping Motor is drived. By means of Dual Supply Method, the rise time of starting current is reduced and stiffness components of T-θ characteristics is improved, and then modified mathematical model of the characteristics of torque and experimental requirements are compared, furthermore, the improvements of stiffness rise up the effective driving torque and then enlarged the slewing torque and starting torque. With the optical Encoder, by comparison of the input-output pulse, the error of vibration and the range of stable drives would be detected.

3相 인버터 운전 유도기系에서 最適化 스윗칭에 의한 Torque 맥동의 低減에 관한 硏究

禹靖仁 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2

All PWM inverter fed induction motor systems which the switching patterns are determined by the approximated sinusoidal modulation techniques have many troublesome problems such as the torque pulsations duing to harmonic components. Therefore, in this paper, the current and torque pulsations for a inverter fed induction motor drive system are analyzed and specified theoretically and the determination techniques of optimal switching patterns for minimization of these factors are presented. Also, these simulation results are compared to the ones obtained from the realized experimental system by one chip microcomputer, 8031.

전동기제어용 20KHz.캐리아 PWM 인버어터

이현우,우정인 慶南大學校 附設 工業技術硏究所 1989 硏究論文集 Vol.7 No.-

변형 梯形波에 의한 三相 PWM 인버어터의 특징을 살린 전동기제어용 PWM 인버어터를 제안한다. 캐리아주파수를 가청주파수 이상으로 오릴 경우, 인버어터출력에 포함되는 사이드밴드는 전부 20㎑ 이상의 높은 주파수영역으로 분포하기 때문에 저소음 인버어터를 실현할 수 있다. 삼상구성은 대단히 간단하고 기본파성분의 진폭치는 종래의 정현파 PWM보다 20% 크게 된다. A motor controlling PWM inverter which utilizes the characteristics of the modified trapezoidal three-phase PWM inverter is presented. Low-noise inverter can be accomplished because of the high sided band frequencies greater than 20㎑ which are included in the output of the inverter. The structure of the three-phase inverter is very simple and the fundamental components of the amplitude are 20% greater than those of the conventional sinusoidal PWM inverter.

Topical 0.2% rapamycin for angiofibromas due to tuberous sclerosis complex (TSC)

( Young In Lee ),( Tae Gwang Kwon ),( Dae Suk Kim ),( Do Young Kim ),( Juhee Lee ),( Ki Yang Chung ),( Min Geol Lee ),( Kwang Hoon Lee ),( Jung U Shin ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1

Tuberous sclerosis complex (TSC) is an autosomal dominant neurocutaneous syndrome which causes hamartomatous growth in multiple organs. In TSC, the mammalian target of rapamycin(mTOR), a protein kinase that has a diverse functions in protein syntheses, is aberrantly activated, causing an abnormal cellular proliferations. Among the hamartomatous skin lesions, facial angiofibormas occur in 80% of patients. Although angiofibromas are usually asymptomatic, they can significantly affect the quality of life of the patients. Rapamycin is an mTOR inhibitor involved in correcting aberrant signaling pathways regulating cell growth and apoptosis, therefore known to inhibit tumorigenesis activity. Recently, topical formulation of rapamycin has been proposed as an effective option to treat angiofibromas in TSC patients without critical side effects. Over the past 6 months, we have treated a total of 20 patients with topical rapamycin through the dermatology outpatient clinic of Severance Hospital, Yonsei University College of Medicine. Patients had histories of recurrent angiofibromas, and had done several treatments with laser ablation without sufficient improvements. In our study, we found that the topical 0.2% rapamycin ointment was safe and effective for facial angiofibromas with minimal side effects. Nevertheless, few severe adult patients showed limited efficacy with rapamycin treatment alone. Therefore, we suggest that 0.2% topical rapamycin can be considered a safe option for the treatment of facial angiofibromas in Korea, especially for younger patients.