전자개폐기의 아-크 억제 방안에 관한연구

노창주,홍순일,정승환 대한전기학회 1983 대한전기학회 학술대회 논문집 Vol.1983 No.7

ELECTRIC VEHICLES을 위한 제어시스템 설계

노창주,김윤식,오진석 한국마린엔지니어링학회 1993 한국마린엔지니어링학회지 Vol.17 No.4

This paper presents an advanced AC drive system used in electric vehicles. The system consists of a drive motor, a PWM transistorized inverter, a PCL-812PG data card, and a controller. This paper describes a design method for RSPWMSS and PID controller. This controller system is implemented on computer and applied to drive motor(induction motor), yielding satisfactory result.

서보 제어계 설계지원을 위한 퍼지추론 TOOL의 개발

노창주,홍순일 한국마린엔지니어링학회 1995 한국마린엔지니어링학회지 Vol.19 No.4

The diffusion of fuzzy logic techniques into real applications requires specific software supports which save development time and reduce the programming effort. But we has been lack of a tool devoted to support the design of fuzzy controllers. In this paper, on the basis of the general fuzzy set and .alpha.-cut set decomposition of fuzzy sets, a set of fuzzy reasoning tool(FRT) devoted to support the design of fuzzy dontroller for servo systems is developed. The major features of this tool are: 1) It supports users to analyze fuzzy ingerence status based on input deta and expected results by three-D graphic display. 2) It supports users to prepare input data and expected result. 3) It supports users to tuned scaling factor of membership functions, rules and fuzzy inference. The paper shows how the suggested design tools are suitable to give a consistent answer to the tuning of fuzzy control system. This FRT is expected to exert good performance and devoted to support which the design of fuzzy controller is illustrated in the servo systems.

MHD 추진장치내의 자기유체 유동에 관한 실험적 연구

노창주,김윤식,공영경,이성근 한국마린엔지니어링학회 1993 한국마린엔지니어링학회지 Vol.17 No.3

Usually ship is propelled by the conventional propeller. When the conventional propeller is used for ship's propulsion, reduction of propeller noise is big issue in some special vessel. In order to reduce the acoustic noise of the propeller, novel propulsion system named as MHD propulsion system has been studied among researchers. In this paper, thruster characteristic analysis and system analysis of MHD propulsion system have been carried out. Firstly basic experimental apparatus is designed, fabricated and installed and test is carried out. Test results are compared with numerical analysis. It is confirmed that test results agreed with numerical results satisfactorily.

보조접점에 의한 차단기의 arc억제에 관한 연구

노창주 한국마린엔지니어링학회 1984 한국마린엔지니어링학회지 Vol.8 No.2

The Author researched and published its results on how effectively the arcs suppressed when the contactors are opened at current zero point which indispensively exsists in AC circuits. In order to increase the effectiveness of suppressing the arcs in larger current, the author suggests a new suppressing method using auxiliary contactor which contains resistance which is connected in parallel with main contactor. The author's firm belief is that the arcs are suppressed remarkably, but there are several problems, especially how to determine the optimal resistance connected in series with auxiliary contactor.

유도전동기 구동을 위한 전류형 인버어터의 전류회로 최적설계에 관한 연구

노창주,홍순일 한국마린엔지니어링학회 1985 한국마린엔지니어링학회지 Vol.9 No.3

With the advant of thryistors having large peak inverse voltages, current-source inverters are becoming very popular to feed induction motors. But it is very difficult to analysis the commutation. Since the actual variation of current during commutation is neither instantaneous nor linear and is effected by many parameters. Minimized bias-time of reverse voltages during commutation is expressed in term of machine parameters, capacitor voltage, load current and so on. The minimized bias-time is computed with y and z and also the commuation mechanism is tested on 2.2 kw induction motor. The computed results are compared with the experimental results, and the results give a good information for designing the commutation mechanism.

마이크로프로세서를 이용한 3상 브리지 콘버터의 제어회로 설계에 관한 연구

노창주,김윤식,김영길,유진열,류승각 한국마린엔지니어링학회 1992 한국마린엔지니어링학회지 Vol.16 No.4

The three-phase full(6-pulse) bridge controlled rectifier is one of the most widely used types of solid-state converters in DC drive applications for higher performance. In most of the previous designs, the gate control circuits of the converter have been designed with analog method which can be easily affected by noise. Nowdays with advances of microelectronics and power electronics, microprocessor and pheripal LSIs are increasingly used for eliminating this problems. In this paper, a novel general-purpose microprocessor -based firing system and control scheme for a three-phase controlled rectifier bridge has been developed and tested. Using the phase relations between ${\Delta}$-Y transformer in power operation part, gate pulse of the converter is generated with real time process so that microprocessor may share its time to control algorithms efficiently. The firing angle of the converter is smoothly controlled in the range of 0 $^{\dirc}$ to 180$^{\dirc}$ with a fast respone and a constant open loop gain, even for the case where the converter is fed by a weak AC system of unregulated frequency. The hardware and software control circuit implementation built around a 80286 microprocessor is discussed, and the experimental results are given. This scheme uses less hardware components and has higher dynamic performance in variable speed DC drive applications.

전자개폐기의 arc 억제방안에 관한 연구

노창주,홍순일,정승환 한국마린엔지니어링학회 1983 한국마린엔지니어링학회지 Vol.7 No.1

Nowadays electromagnetic contactors are used for power on-off in various electrical loads. If the severe arc are occurred when power off, the magnetic contactor can not long run because of damage of contactor. In this paper, Authors indicate a method of how to minimize the arc when power off, Authors contrived a electronic circuit which can adjust the demagnetizing point of electro magnetic contactor, and control the demagnetizing point, utilizing our circuit, so as to occur the extinguish of arc at near the AC current zero point which is indispensibly exists. From the results of study, Authors could get confirmations the AC circuit could cut off with occurrence of mininum arc, and that possibility of extensive utilization of our method to hightension circuit.

Triac을 이용한 삼상유도전동기의 일차전압평형제어에 따른 특성 연구

노창주,유춘식,정경열 한국마린엔지니어링학회 1984 한국마린엔지니어링학회지 Vol.8 No.1

In this paper, the characteristics relating to the stator voltage control of a small three phase squirrel cage induction motor by means of symmetrically trggered triacs instead of antiparallel SCR's is described. A complete model of the system with 220V, $3{\phi}$, 1HP motor and triac gate control circuit has been designed and tested in the laboratory, and the experimental results are compared with the numerical values. As a result of the above investigation, it is found that the range of induction motor speed control by stator voltage control is narrow.

DC chopper용 전류회로 개선에 관한 연구

노창주,오진석 한국마린엔지니어링학회 1989 한국마린엔지니어링학회지 Vol.13 No.1

This paper treats the analytical and experimental studies on the improvement of commutating circuit for the speed control of DC motor. A simple circuit composed of R, L and C elements is proposed here for switching off power SCR carrying the load current. The real important in this chopper circuit is to determine the reasonable values of commutating circuit constants. In this paper, the reasonable values of the commutating circuit constants are basically determined on a view point of commutating performances in the given circuit model and must satisfy the following conditions. The first, the peak commutating current should be larger than the anticipated maximum load current. The second, the circuit turn-off time (tc) must be longer than the SCR turn-off time (tq). The third, the resistor should be enough large to permit the current to be neglected in the analysis of the commutation circuit, as well as be enough small to permit to charge the capacity voltage (Ec) to the half the value of source voltage (E) before the next communication cycle is initiated. The last, the period of chopping signal must be the least possible multiple of the damping vibration period of commutating circuit. The improved chopper circuit used in the experiment under unloaded condition was composed to meet the reasonable conditions mentioned above, and a successful commuting performance was achieved without failure. Several types of microprocessor having a different value of CPU speed individually have been applied to the experiment under the loaded conditions. Also it shows that the faster the speed of CPU is, the more stable the commutation turns out.