This paper deals with design and analysis of thrust magnetic bearing for 300HP class high speed motor. Using the solutions obtained from equivalent magnetic circuits, we predicts the electromagnetic characteristics such as thrust, time constant and power loss according to design parameters. And then, using non-linear finite element analysis, a detailed design is performed considering saturation in order to meet requirements.

This paper deals with the electrical design and analysis of a 300HP, 60,000rpm permanent magnet synchronous motor for turbo machine. The design is performed by analytic method of magnetic field theory. And electrical losses of the motor driven by current with sinusoidal and harmonic form are analyzed by using FEM.

The Super High-Speed Motor is a turbo machine which operates at high speed, so air foil bearings suit their purpose as bearing elements. The rotordynamic stability was predicted using the numerical analysis of air foil bearings. From this study, the stability of rotor of the Super High-Speed Motor was confirmed by campbell diagram and logarithmic decrement.

It is well known that the characteristics of the induction machine depend on a great degree on the leakage reactance. And the leakage reactance is different according to a level of slant. So in this paper, we calculated the inductance per coil side. And the torque and speed characteristics are analyzed using a method base on the two-dimensional (2-D) finite element method (FEM) and on the circuits theory to model the rotor bar in a induction machine. The variable values of bar angle of slant are considered.

공장 내에서 부적절한 배선 및 설치 등에 의하여 검사과정을 수행할 경우 noise나 오결선을 유발시키며, 이는 측정해야할 신호가 부적절한 동작을 발생시키거나 검사가 되어 출하 후에 하지 않아도 될 A/S 지원을 해야 하는 등의 추가 경비가 소요되는 문제까지도 야기시킬 수 있다. 이때, 사용자측에서 발생될 불만에 따른 회사 및 제품의 신뢰도 저하는 더 큰 문제가 아닐 수 없다. 본 개발에서는 GUI(Graphic User Interface) 환경과 통신기술을 접목하여 다양한 제품의 검사를 위한 시스템을 개발하고자 한다.

본 연구에서는 RLS(Rescursive Least Square) 알고리즘을 이용하여 정전용량형 습도센서를 사용한 원격 RF 센서 시스템의 시변 파라메타를 추정하고자 한다. IC 칩 형태의 원격 RF 센서 시스템이 가지는 구성의 복잡성 그리고 전력소모 문제를 해결하기 위해 보다 간단한 유도결합모델이 제안된다. 모델기반의 RLS 알고리즘을 수학적인 모델로 유도된 시스템에 적용시키기 위해 페이저법을 이용하여 모델의 파라메타를 재배열한다. 오차 제곱합의 수렴특성을 가진 RLS 알고리즘을 이용하여 시변 파라메타를 추정하며, 잡음을 내포한 측정 데이터에 대한 추정 성능을 확인함으로써 그 유효성을 검증하고자 한다.

로봇의 메커니즘 중 가장 어렵고 필수 구성 수단인 부품으로 여겨지는 것은 관절이다. 이에 관해서 오래 전부터 많은 연구가 수행되고 있다. 본 논문은 이 로봇관절에 대한 것으로 축에 연결된 구형 또는 반구형 영구자석을 이용하여 관절의 자유도를 늘림과 동시에 응답속도를 빠르게 하기 위한 장치에 대한 연구로서 영구 자석과 고정자 사이에 공극을 두고 서로 수직으로 교차하도록 고정자 권선을 배치하고 권선에 전류를 흘려서 관절을 움직이게 하는 방법이다. 구형 또는 반구형자석이 장착된 축과 반구형 쉘(shell) 내부에 교차하는 두 개의 고정자 권선이 장착된 축으로 구성된 것을 특징으로 한다.

대용량 고온 초전도 변압기에 적용하기 위한 1,500 A 급 초전도 병렬 선재를 제작하여 특성시험을 하였다. 병렬 선재는 21가닥의 BSCCO 선재를 250 mm 간격으로 전위한 뢰벨(Roebel)바 형태로 제작하였다. 특성시험을 통해 병렬 선재 제작기술을 확보하였다. 24 가닥의 병렬 선재를 이용하여 전압 분배나 절연 특성이 좋아 고전압 변압기에 채택할 수 있는 1,000 A급 연속 디스크 권선을 제작하였다. 전위를 고려하여 만든 병렬 선재로 제작한 1,000 A급 연속 디스크 권선의 임계전류와 교류손실을 측정하였다.

초전도 변압기의 권선에서 발생하는 교류손실은 시스템의 효율과 안정성에 큰 영향을 미친다. 본 논문에서는 고온 초전도 변압기의 권선 구조에 따른 교류손실과 % 임피던스 특성을 살펴보았다. 변압기 철심의 형태가 내철형과 의철형인 경우에 대하여 설계를 하였으며 각 형태에 따른 교류손실과 % 임피던스를 계산하였다. 154 kV/5 MVA 고온 초전도 변압기의 두 가지 철심 형태의 해석을 통해 각각의 특성을 비교하였다.

This paper presents a analysis on the characteristics of induction motor under the efficiency & slip variance. An induction motor changes its characteristics parameters under the operation condition with the same capacity. In this paper, we analyzed that how the power and torque characteristics of induction motor would be changed according to the change of these parameters.

This paper presents research about improvement of fault detection algorithm in FRTU on the feeder of distribution system. FRTU(Feeder Remote Terminal Unit) is applied to fault detection schemes for phase fault, ground fault, and cold load pickup and Inrush restraint functions distinguish the fault current and the normal load current. FRTU is occurred FI(Fault Indicator) when current is over pick-up value also inrush current is occurred FRTU indicate FI. Discrete wavelet transform(DWT) analysis gives the frequency and time-scale information. The neural network system as a fault detector was trained to discriminate inrush current from the fault status by a gradient descent method. In this paper, fault detection is improved using voltage monitoring system with DWT and neural network. These data were measured in actual 22.9kV distribution system.

본 논문에서는 FEM (Finite Element Method)을 이용한 압전세라믹의 특성해석을 통하여 잉크젯 프린트헤드를 설계, 제작하였다. 압전세라믹의 물질 특성과 잉크유체 특성을 고려한 굽힘 모드방식의 구동원리와 이론정립을 하였다. 압전방정식은 압전구조에 의한 공진주파수로 압전 파라미터를 구할 수 있고, 실험을 통하여 이러한 측정값을 얻을 수 있었다. 제작된 압전세라믹 프린트헤드의 잉크드롭 실험결과 통하여 이에 대한 특성을 알 수 있었다. 이때 잉크유체의 음파와 압전 공진주파수 범위 내에서 압전세라믹 응력(변형)의 이득을 발생할 수 있음을 제작한 128노즐의 압전세라믹 잉크젯 프린트헤드로부터 알 수 있었다.

Industrial interest in switched reluctance moor (SRM) drives has varied since 1850s. This has been primarily due to the emerging markets for variable speed drives in consumer and industrial products, such as home appliances, air conditioning, hand tools, fans, pump motor, etc. However, SRM has been plagued with the acoustic noise and vibration problem by input power of fixed section. Therefore, This paper offers electromagnetic analysis for torque ripple reduction in mechanical geometry and electric parameters. This means that the rotor pole arc and electric parameters have related to produce the active and negative torque. This analysis results are verified by the finite element method.

This paper deals with analytical prediction for the cogging torque of permanent magnet machines with multi-pole rotor First. open-circuit field solutions are derived using a magnetic vector potential and a two-dimensional (2-d) polar coordinate systems. On the basis of derived open-circuit field solutions and 2-d permeance functions. we also derive the analytical solutions for the open-circuit field considering stator slotting effects and cogging torque. All analytical results are shown in goof agreement with those obtained from finite element (FE) analyses.

This paper presents the characteristic analysis of the 40-kVA high speed synchronous generator considering the field current. The generator consist of the rotor with the short-circuited field coils connected armature coils of exciter and the stator with three-phase winding. To analyze the characteristics of the generator, the direct finite element method is applied.

This paper deals with design of high speed linear switched reluctance motor(LSRM). First, we derived design factor from pole arc ratio of stator and mover, and calculated time constant using inductance and resistance. Second, we decided design parameter from design factor using time constant. Finally, analyze characteristics for LSRM using finite element analysis.

This paper proposes a novel flux barrier in q-axis of rotor in IPM type BLDC motor, The proposed flux barrier can reduce cogging torqeu and diminisg torque ripple by sinusoidal waveform distribution of flux generated in the permanent magnet. To determine the optimal shape of the novel flux barrier, we also propose a modified Taguchi method which considering multiple quality characteristics, such as cogging torque, average torque, and efficiency. The proposed design and method were analyzed by using the 2D finite element method (FEM). Results of the proposed model were compared with initial model.

The operational characteristics of superconducting fault current limiter (SFCL) using magnetic coupling of coils were investigated. This SFCL consists of a high-Tc superconducting (HTSC) element and two coils with series or parallel connection on the same iron. This SFCL has the merit that the operational current of SFCL can be increased higher than the critical current of the superconducting element by adjusting the inductance ratio between two coils. To confirm its operation, the circuit for the fault simulation was constructed. From the measured voltage and current of the SFCL, it was confirmed that the resistance of HTSC element comprising this SFCL increased more than that of HTSC element's independent operation.

Speed and torque controls of induction motors are usually attained by the application of position and speed sensors. However, speed and position sensors require the additional mounting space, reduce the reliability in harsh environments and increase the cost of a motor. Therefore, many studies have been performed for the elimination of speed and position sensors. This paper investigates an improved sensorless control of an induction motor. The proposed control strategy utilizes the MRAS(Model Reference Adaptive System) for estimating the speed of a sensorless induction motor. The proposed algorithm is verified through the simulation and experimentation.

A hybrid optimization method is proposed for cogging torque reducing in BLDC motor. The proposed hybrid optimization method comprises a response surface method (RSM) and a gradient search method (GSM). The RSM is effective and global method in optimization problem but having large approximation error. The GSM is accurate and fast search method for optimal solution but having local behavior. To reduce approximation error and computation time a hybrid method (RSM+GSM) is proposed method. To illustrate the effectiveness of the proposed method, a comparison between conventional RSM and the proposed hybrid method is made. A simulation results verify that the hybrid method can achieve favorable design performance.

본 논문에서는 변압기 권선의 기계진동모드인 공진주파수를 Transfer Matrix Method를 이용하여 계산하였고. 이를 기계구조 프로그램인 ANSYS를 이용하여 증명 하였다. 본 연구에서 사용된 방법들은 단락시 발생되는 변압기 권선진동을 연구할 때 유용하게 활용할 수 있을 것이다.

초전도 선재에 대 전류를 흘리기 위해서는 여러 가닥의 초전도 선재를 병렬로 연결하여 사용하여야 한다. 본 논문에서는 교류 손실에 미치는 전류 분류의 영향을 알아보기 위해 6가닥의 병렬선재 분기대를 제작하고, 전류분류가 균일 할 때와 불 균일 할 때의 임계전류 및 교류 손실의 차이를 확인하였다. 홀 센서를 이용하여 각 가닥의 선재에 흐르는 전류의 값을 예측할 수 있는 방법을 제시하였다.

In this paper, the dynamic characteristic according to disturbance load of Permanent magnet Linear Synchronous Motor(PMLSM) is dealt with carefully. In order to analyze dynamic characteristics, the simulink of Matlab is used. And F.E.M. is used for calculation of the parameter of PMLSM. The measuring system of the dynamic characteristics is manufactured and experiment results are compared with simulation results.

This paper proposes a program architecture integrating different engineering software packages, such as Auto-Cad, Excel and Magnet, for realizing an automatic motor analysis. Based on the architecture, the characteristic analysis of a PM-Assited Reluctance SynchronousMotor (PM-RSM) is automatically executed only if main input data of the motor are fed. To achieve this, API fuctions and Visual Basic Scripts provided by the software packages are thoroughly exploited.

This paper is proposed high performance speed control using AFNN controller. The design of the speed controller based on adaptive fuzzy-neural networks(AFNN) controller that is implemented using fuzzy control and neural networks. The control performance of the AFNN controller is evaluated by analysis for various operating conditions. Analysis results are presented to show the validity of the proposed algorithm.

This paper presents multi-PI controller of IPMSM drive using fuzzy and neural-network. In general, PI controller in computer numerically controlled machine process fixed gain. To increase the robustness, fred gain PI controller, Multi-PI controller proposes a new method based fuzzy and neural-network. Multi-PI controller is developed to minimize overshoot and settling time following sudden parameter changes such as speed, load torque, inertia, rotor resistance and self inductance. The results on a speed controller of IPMSM are presented to show the effectiveness of the proposed gain tuner. And this controller is better than the fixed gains one in terms of robustness, even under great variations of operating conditions and load disturbance.

This paper is proposed an efficiency optimization control algorithm for IPMSM which minimizes the copper and iron losses. The design of the speed controller based on adaptive fuzzy teaming control-fuzzy neural networks(AFLC-FNN) controller that is implemented using adaptive, fuzzy control and neural networks. The control performance of the AFLC-FNN controller is evaluated by analysis for various operating conditions. Analysis results are presented to show the validity of the proposed algorithm.

This paper presents a fuzzy logical control method to implement an on-line optimum efficiency control for Permanent Magnet Synchronous Motor. This method real-timely adjusts the output voltage of the inverter system to achieve the optimum running efficiency of the whole system. At first, the input power is calculated during the steady state in the process of efficiency optimizing. To exactly estimate the steady state of the system, this section needs check up the speed setting on timely. The second section is to calculate input power of dc-bus. The exact measurement of the voltage and current is the vital point to acquire the input power. The third section is the fuzzy logic control unit, which is the key of the whole drive system. Based on the change of input power of dc-bus and output voltage, the variable of output voltage is gained by the fuzzy logical unit. With the on-line optimizing. the whole system call fulfill the minimum input power of dc-bus on the running state. The experimental result proves that the system applied the adjustable V/f control method and the efficiency-optimizing unit possesses optimum efficiency, and it is a better choice for simple variable speed applications such as fans and pump.

In this paper, a modified multi-level convert for low cost high speed switched reluctance (SR) drive is proposed The proposed multi-level converter has reduced number of power switches and diodes than that of a conventional asymmetric converter for SRM, and lower voltage rating of the dump capacitor comparing with energy efficient c-dump converter. It can supply five operating modes that is boosted, DC-link, zero, negative bias and negative boosted voltage. The proposed multi-level converter has fast excitation and demagnetization modes of phase current, so dynamic response can be achieved. The proposed multi-level converter is verified by computer simulation and experimental results.

This paper presents single-phase SRM drive system with single-stage high power factor and low torque ripple. Single-phase SRM has simple mechanical and electrical structure, robust and high speed operation characteristic. But conventional SRM drive with diode bridge rectifier and filter capacitor has a low power factor because of short charge time of capacitor. Therefore, this paper presents a novel single-phase SRM drive with single-stage structure circuit, which can improve the power factor and reduce peak torque ripple. A novel switching topology is presented base on mathematical analysis. The novel drive method is verified by simulations and experiments.

Pancake windings have merits that are easier to make high field magnets and replace windings when an accident happens and windings are aged. The current of the whole magnet consisted of windings connected in series was limited by the minimum current of the top and bottom pancake windings where maximum perpendicular magnetic field was applied. This paper propose a optimal design of a HTS magnet excited by a single source, where evolution strategy was adopted for optimal design algorithm. A magnet consisted of 8 BSCCO pancakes was chosen to prove the effectiveness of this optimal design method. Magnetic field at the center of a magnet was chosen as the object function and it was used maximized. Results of the optimal design shows that the increment of the number of turns of the pancake winding make the magnetic field of the center of the magnet increase but the current of the winding decrease for the larger perpendicular magnetic field.

누전으로 인한 전기화재나 감전사고와 같은 전기재해는 저항성 누전전류에 의해 발생하므로 전선로에서 저항성 누전전류의 측정은 매우 중요하다. 따라서 본 논문에서는 합성 누전전류로부터 저항성 누전전류를 산출할 수 있는 이론을 제시하였고 이것을 실제 회로로 구현하였다. Multiplier와 저역통과필터를 통과한 합성 누전전류신호는 저항성 누전전류의 크기에 해당하는 직류 전압신호로 출력된다 따라서 Multiplier와 R-C 필터를 이용하여 간편하게 저항성 누전전류를 구할 수 있었다. 그리고 누전실험을 통하여 저항성 누전전류와 용량성 누전 전류가 합쳐진 합성 누전전류에서 저항성 누전전류를 정확하게 산출하는 것을 확인하였다.

This paper presents a design notch to reduce cogging torque of interior type permanent magnet motor. As design notch on rotor of IPM motor, magnetic field from between rotor and teeth of state is changed. By reason of variation magnetic field, cogging torque is generated. Through Fourier formulation of magnetic field on rotor, we found position of notch and manufactured armature that is designed by optimizing analysis. The validity of the proposed design is confirmed with experiments.

In this paper, the notch of teeth, the shape changing and skew of permanent magnet are used to reduce the detent force. And addition, overhang of permanent magnet is applied to increase thrust because thrust is decreased by skew. As the results, detent force is decrease greatly about 98(%). And, the ripple ratio of thrust is decreased from 11.34(%) to 0.25(%).

The increment of electric power demand causes interest on new higher power system such as 42V Power Net, and furthermore necessity for development of energy storage device is highlighted recently. Owing to high efficiency and easy speed control of brushless DC(BLDC) motor, the demand of BLDC motor that has high power and low noises are increasing. Especially demand of interior permanent magnet(IPM) type BLDC with high efficiency and high power in electric motion vehicle is increasing. This paper presents the design of the BLBC motor for EHPS(Electro-Hydraulic Power Steering) in 42V system and verified the characteristics by simulation and test results.

고전압 가스 차단기에서는 긴 스트로크 동안 가스반발력을 극복하고 빠르게 차단할 수 있는 액추에이터가 필요하다 기존에는 공압식, 유압식, 스프링 액추에이터와 같은 기계적인 장치가 사용되었다. 그러나 기존 액추에이터에서는 소음, 에너지 손실, 고가적의 단점이 있어, 근래에 들어 PMA, 모터와 같은 전기적 장치도 사용되고 있다. 전기 액추에이터는 간단한 구조로 되어 있어 기계적 손실을 줄일 수 있고 소음이 적은 장점이 있다. 전자석 조작기의 연구 필요성에 따라 새로운 형태의 전자석 조작기 Electro Magnetic Force driving Actuator(EMFA)가 개발되어 고전압 가스 차단기에 적합하다고 분석되었다. EMFA의 동특성을 얻기 위한 과도상태 해석에서는 2차원 유한요소법을 이용하여 얻은 전자기적 해석을 회로, 운동방정식과 연계하여 시간차분법을 사용하여 해석하였다. 하지만 2차원과 3차원의 전자기 해석은 차이를 보인다는 것을 확인하였고 정확한 전자기 해석을 위해 3차원 동특성 해석을 수행하여 실험결과와 비교하였다.

본 연구에서는 Free-piston 엔진용 원통형 선형 발전기의 전동기 운전을 이용한 기동에 관한 연구를 수행하였다. Free-piston 엔진의 피스톤이 흡기, 압축, 폭발, 배기 과정에 따라 정상 상태로 왕복운동을 하기 위해서는 기동 시 정지상태인 피스톤을 외부의 힘으로 움직여 연소실에 있던 공기를 밀어내고, 연료를 연소실안에 흡입한 뒤 다시 압축시켜 플러그를 통해 폭발시켜 주어야 한다. 이 과정에서 별도의 전동기를 사용하는 대신 Free-piston 엔진에서 사용하는 원통형 선형 발전기를 전동기로 사용하여 엔진의 기동을 위해 요구되는 속도와 토크를 만족시키는지 동특성 해석을 하였고, free-piston 엔진을 기동시키기에 충분한 속도와 토크를 낼 수 있다는 결론을 얻었다.

The purpose of This paper is the optimal design of a single-phase LSPM(Line-Start Permanent magnet Motor). A single-phase LSPM has a permanent magnet in the rotor that is same as induction motor. For that reason, the transient characteristics are very different from an induction motor Therefore, we need the PM design to consider a transient and steady- state characteristics. In this paper, we designed a single-phase LSPM that has a high power and a good starting characteristics, and analyzed the performance of designed LSPM by varying each parameters. Finally, we examined and compared the simulation results and the prototype motor's characteristics.

In this paper, we research improvement in efficiency of single-phase induction motor by adapting the condition of the balanced and quasi-balanced operation. we maintain turns of auxiliary winding of the motor and adjust resistance and reactance. In this condition, resistance value and copper loss are much gloater. Namely, this is the condition only for balancing MMF without consideration of copper loss of stator winding. To make more practical design, therefore, we will perform winding design which is based on balanced operation condition and applies copper loss minimum. The problem of deterioration of starting torque is completed by rotor bar shape design.

본 논문에서는 600kJ급 SMES용 열전도판의 와전류 손실의 해석에 대해서 나타내었다. SMES의 운전 상태는 충전, 운전, 방전의 3가지 구간으로 나누어 볼 수 있다. 이 중 방전 구간에서는 SMES 코일에서의 전류 감소에 의해서 와전류 손실이 발생한다. 이때 발생하는 와전류 손실은 짧은 시간동안 발생하지만 그 크기가 크기 때문에, SMES 시스템 설계 시 냉각 시스템의 효율과 안정성을 위해서 반드시 고려되어야만 한다. 본 논문에서는 이러한 열 전도판의 와전류 손실을 해석하고, 그 형상의 변화에 따른 와전류 손실 값들을 분석하였다.

By enforcing skew of permanent magnet, detent force decreases, but lateral force that acts for vertical direction of moving direction occurs. This force deteriorates various performance of PMLSM as that acts to friction force between mover and LM guide. Therefore, in this paper, V skew model is proposed for lateral force's reduction and simulation results are compared to experimental value.

These days, robot-industry development requires a new motor technology. Robot system is more complex than the other machine ones. They need the simplicity and light weight as robot systems. Moreover, They have to become a high energy efficiency machine. For these reasons, in this paper, the 3-degrees of freedom permanent-magnet spherical motor is proposed instead of existing ones. The proposed motor model is analyzed by using FEA(Finite Element Analysis), for comparing the results, torque of the motor is simulated by derived torque function.

This paper presents the MHD characteristics of the liquid metal flow. The electromagnetic force was calculated by the equivalent circuit method. This Lorentz force was used as a source term for the fluid flow equations. The modified Navier-Stokes equation was solved to give the velocity distributions of the liquid metal flow.

Interior Permanent Magnet Synchronous Motors(IPMSM) are expanding the application extent for industrial applications. Because that High efficiency and wide speed range are required in applications of electric vehicles, spindle drives and compressors and so on. The performance of IPMSM are deeply affected by the current phase control. Therefore, this paper deals with the analysis of the torque performance according to the variation of the current phase angle.

This paper presents design results of anultra-small actuator for auto focus or optical zoom function of mobile phone cameras. The consideration of the actuator is tubular type having a large hole in its center to arrange some optical lenses. The stator consists of 3-phase windings, and the mover is designed to an Nd injection permanent magnet(PM) which magnetized with multi-pole polar pattern. From the numerical analysis that taking into account the magnetizing pattern of the PM, the thrust of the designed actuator is about 40mN with the outer diameter of 7mm.

The stator faults yield asymmetrical operation of induction machines, such as irregular current, torque pulsation, increased losses and decreased average torque. So it is necessary to detect the stator faults and develope the monitoring system for detecting faults including vibration and noise. This paper describes the method to analysis the induction motors with the stator winding inter-turn short for investigation of the asymmetrical operation during normal and transient states. And a simple method is used for the simulation and analysis of the induction machines with stator asymmetries. Finally, simulation results, finite element analysis and experimental ones are presented. The results can be useful for real-time on-line monitoring of an induction motor.

It is as result that study to apply mini magnet nerve curer in peripheral nervous system disease treatment. Design and embodied action power and Control Unit in cylinder form of magnet roof object firstly. Yielded service area about special quality of probe of roof object cylinder style and treatment area dimension and distance of treatment pulse secondly. Embody pulse forming course energy value by Probe's form by third, could embody treatment pulse by disease. Specially, through a special quality experiment, saved Damping pulse form and treatment pulse form etc. variously Lately, embodied this to aid a little in disease treatment that follow that there is no invasion that there is no stimulation by medicine development Go amplitude treatment pulse (traditional magneto-therapy of greatly great that strong.) does curative effect greatest at short time and becomes thought that demand is magnified greatly at the future in this research.

Laser wave length can have evaporation effect by absorption because outer skin or tissue of focus is consisted of water almost though absorption of water occurs more than 90% almost in formation thickness of very thin floor Can operate outer skin, steam by floor and correct incision of formation is available. Suture surgical operation is avaliable to vein or lymph system and surgical operation region can dry and see as eye and radish bleeding surgical operation is avaliable Specially, stability of tube both end output about pulse by weight very, this research can cause various curative effect because can reduce bulk and control easily current wave style of medical laser using electric power conversion device of high frequency way. If introduce ZVS (Zero Voltage Switching) or ZVZCS (Zero Voltage and Zero Current Switching), is more profitable because can reduce switching damage Because electric power department of proposed medical laser can do stable soft-switching in wide subordinate extent introducing ZVZCS technique by the first help and control department composes microcontroller, output current waveform user have free form make. Result that experiment because design and manufacture, brought result that improve of 20% than existing equipment, and will be bought to get into superior result if supplement as systematic late.

$CO_2$ laser sees that is most suitable to get this effect through minimum formation damage and advantage that is root enemy of effect that happen in minimum cellular tissue depth of 0.1mm is stable living body organization or internal organs institution. Formation damage by ten can be related in formation's kind or energy density, length of evaporation time. If shorten evaporation time, surroundings cellular thermal damage 200 - because happen within 400ums laser beam in rain focus sacred ground surroundings cellular tissue without vitiation me by evaporation Poe of very small floor as is clean steam can. Application is possible to vulva cuticle cousins by a paternal aunt quantity, uterine cancer, cuticle tumor by laser system that $CO_2$ laser gets into standard in obstetrics and gynecology application. Because effect that super pulse output is ten enemies of laser if uniformity one pulse durations are short almost is decreased, most of all pulse module special quality of pulse style $CO_2$ laser for obstetrics and gynecology mode stabilization by weight very, in this research to get into short pulse duration and higher frequency density, do switching by high frequency in DC-DC Converter output DC's ripple high frequency to be changed, high frequency done current ripple amount of condenser for output filter greatly reduce can. Ripple of output approximately to Zero realization applying possible inductor realization through a special quality experiment do.

This paper presents a "window-zoom-out" optimization strategy with relatively fewer sampling data. In this method, an optimal Latin hypercube sampling experiment based on multi-objective Pareto optimization is developed to obtain the sampling data. The response surface method with multiquadric radial basis function combined with (1+$\lambda$) evolution strategy is used to find the global optimal point. The proposed method is verified with numerical experiments.

영구자석 선형 동기 전동기(PMLSM)는 코깅력과 단부력에 의한 큰 추력 리플을 갖는 문제점이 있다. 본 논문에서는 영구자석 선형 동기 전동기의 디텐트력을 줄이기 위해 영구자석의 극수와 전기자의 슬롯수의 비를 변경한 새로운 구조의 단 1차형 영구자석 선형동기 전동기를 제안하였으며, 단부력을 줄이기 위하여 전기자의 길이 조정 및 챔퍼링을 통하여 영구자석 선형 동기 전동기를 설계하였다.

본 논문은 3상 불평형 전압이 인가될 때 선간 전압의 실효간을 측정해서 불평형율을 검출하고 선간 전압의 실효간이 평형이 되도록 각 상의 상전압을 전력소자를 사용한 위상각제어를 통해서 각 상별 스위칭각을 비대칭적으로 조절함으로서 3상 전압 불평형을 개선하고자 한다. 이를 모의실험을 통해 저항 부하와 유도 전동기 부하에서 검증하였다.

본 논문에서는 풍속이 가변하는 상황에서 풍력 발전 시스템의 동작을 모의 할 수 있는 풍력 터빈 시뮬레이터를 설계 구현하였다. 실제 풍속과 회전 속도를 실시간으로 입력받으며, 토크 계산에 필요한 블레이드의 효율을 주속비에 관한 함수로 처리하여 사용함으로써 복잡한 조작 없이 가변 풍속조건에서 블레이드에 의한 토크입력을 모의할 수 있게 하였다. 또한 풍력터빈 시뮬레이터를 이용하여 농형 유도발전기식 풍력발전시스템을 구성하여 계통에 연계하였을 경우 발생되는 무효전력을 보상하기 위해 펄스 다중화 보조브리지회로를 이용한 새로운 구조의 36-펄스 전압원 컨버터방식의 실시간 무효전력보상기(STATCOM)를 적용하였다. 그리고 동작특성을 분석하고 제어시스템의 성능해석을 위하여 시뮬레이션 프로그램인 EMTDC/PSCAD를 이용한 시뮬레이션을 실시하였으며, 축소모형 하드웨어 실험을 통해 실험을 통한 분석을 실시하였다.

본 논문에서는 심플로러를 이용하여 실제와 가장 유사한 DFIG (Doubly-Fed Induction Generator)를 모사하였다. 이를 위해서 실제 바람과 유사한 속도 명령을 룩업 테이블로 만들어 대체하였고 실제 전기기기의 파라미터 값을 입력하였다. 그동안 풍력 발전에 있어서 발전기는 주로 매트랩등둥을 이용해서 DFIG를 구현하였기에 실제와 다소 다르고 모의실험으로 대체하기 매우 어려웠지만 심플로러(Simplorer)를 이용하여 실제와 가장 유사한 모의실험 세트를 구현하였다. 우선 터빈의 역할을 담당하는 전동기는 SVM 벡터제어를 이용하여 속도제어를 실시하였고 발전기는 슬립링을 가지고 있는 권선형 유도전동기를 사용하여 DFIG의 구조를 갖추었다.

An interior permanent magnet synchronous motors (IPMSM) are receiving increased attention for many industrial applications because of its high torque to inertia ratio, superior power density, and high efficiency. This paper presents algorithm for speed sensorless control based on an adaptive binary observer adding the fuzzy gain compensator. Effectiveness of algorithm is confirmed by the experiments.

This Paper presents a solution to control the Brushless DC Motor(BLDCM) in Hard Disk Drive(HDD) using the Linear Quadratic Regulator(LQR). Generally, The speed of BLDCM in HDD is controlled by the lead angle control or the input voltage control using PAM(Pulse Amplitude Modulation) etc. These control methods have speed overshoot in speed control and need the long time until BLDCM reaches at the steady state. In order to improve the performance, this paper present the PI speed controller using the LQR based on vector control and the rotor position detection methods at the space vector PWM inverter. The proposed methods are proved by the simulation and experimental results.

This paper presents the Efficiency Characteristic of Three-Level Converter. Three-Level DC/DC Converter Presented in this paper is used a phase shift control with a flying capacitor in the primary side to achieve ZVS for the outer switch. This converter reduces the voltage stress across the main switch to half of input voltage. This paper analyses the loss of each component and the various losses for efficiency variation. The result of the analysis are verified using 3kW prototype.

This paper proposes a linearization technique for the 3 level NPC type inverter, which increases the linear control range of inverter up to the 6-step inverter. The overmodulation range is divided into two modes depending on the modulation index(MI), In mode I, the reference angles are derived from the Fourier series expansion of the reference voltage corresponds to the MI. In mode II, the holding angles are also derived in the same way. Therefore, it is possible to obtain the linear control and the maximized utilization of PWM inverter output voltage.

A linear generator driven by hydrogen (or other kind of fuel) combustion engine requires special consideration for starting because of its none-conventional way of operation. This study investigates the possibility of replacing mechanical (hydraulic) start-up with electrical motoring. Simulation study based on 1 kW prototype system shows that the mover position of a linear generator can be controlled with a proper current control of power converter.

This paper proposes a improvement of switching converter's input wave form using VIENNA Rectifier(three-phase three-switch three-level PWM Rectifier). VIENNA Rectifier is based on the combination of a three-phase diode bridge and dc/dc boost converter. It can be available to get sinusoidal mains current, and low-blocking voltage stress on rower transistors. In addition, it can control output voltage.

Isolated Current fed full-bridge converter with active clamp is analyzed in this paper. An active clamp branch is used for limiting the voltage overshoot in the bridge switches and rectifier diodes. Zero voltage switching(ZVS) is also realized by using the energy stored in the transformer leakage inductance. To analyze the converter, 6 modes of operation are introduced and investigated. For each of the modes, voltage and current equations are derived together with corresponding equivalent circuits. 200W prototype dc-dc converter is assembled and verifies the effectiveness of the analysis and simulation.

As a renewable power source, wind power generation has been research interest for many years. And power electronic converters have been developed and applied in variable speed wind turbines. This paper presents the basic development and implementation of space-vector modulated three phase AC-AC matrix converter for variable speed wind power system. Basic matrix converter operation is described, where a new bidirectional switch structure with commutation circuit is used. Finally, experiment results of basic converter operation are shown.

본 논문은 다계 H-브리지와 다권선 변압기를 이용하여 22.9kV 배전계통에 직접결합하여 전력품질을 보상하는 UPQC(Unified Power Quality Conditioner)를 제안하고 그 동작을 분석한 내용을 기술하고 있다. 제안하는 UPQC는 스위칭소자를 직결한 방식대신 H-브리지로 구성된 인버터모듈을 직결하는 방식으로 동작전압을 증가시켜 배전전압 22.9kV에서 동작할 수 있도록 고안되어 있다. 제안하는 시스템의 기술적 타당성을 입중하기 위해 EMTDC 소프트웨어에 의한 시뮬레이션을 통한 분석을 실시하였으며 또한 하드웨어 축소모형을 제작하여 실험을 통한 분석을 실시하였다. 이러한 검증을 통하여 제안하는 UPQC는 실제규모로 용량을 확대하여 배전계통에 결합할 경우 동작이 가능할 것으로 보인다. 제안하는 UPQC는 배전전압에 따라 H-브리지 모듈의 수를 가감하여 설계의 유연성을 확보할 수 있고 직렬주입변압기가 없이 동작이 가능하여 기존 UPQC의 직렬주입변압기에 의한 제반 취약점을 제거할 수 있다.

This paper proposes the method to improve the charging speed of high voltage capacitor used in the portable medical device. The feedback control method with microprocessor was used to detect charging time and control charging voltage. The result shows that the proposed method is more efficient than only voltage check method with typical charging sequence control.

This paper present the Three-Level converter for high power application. In converter system, magnetic components are important devices used for energy storage, energy transfer, galvanic isolation and filtering. The proposed Three-Level converter is to reduce the number of magnetic components. The secondary rectification was discussed by a single core transformer winding. The result of the analysis are verified using 1kW prototype.

본 연구에서는 Z-소스 네트워크를 갖는 능동전력필터 시스템을 제안하였다. 제안된 방식의 동작원리는 종전의 V-소스 능동전력필터와 동일하나, 고조파 보상 전류가 Z-소스 인버터에 의하여 발생된다는 점이 차이가 있다. 또 제안된 시스템을 서로 병렬 운전하는 경우와 종전의 능동전력필터와 병렬 운전하는 방법을 제안하였다. 제안된 시스템은 PSIM 시뮬레이션에 의하여 타당성이 입증되었다.

본 연구에서는 연료전지 마이크로 소스와 연계된 Harmonic Reducer(H.R)컨버터 시스템을 제안하였다. 이 시스템에 의하여 마이크로 소스의 ac출력전류를 정현파로 개선할 수 있었다. 또한 H.R컨버터의 dc단전압과 전류의 리플은 Zero Ripple(Z.R)필터를 설치하여 제거할 수 있었다. 본 연구의 타당성을 PSIM 시뮬레이션에 의하여 확인하였으며 그 유용성을 입증하였다.

본 논문은 신 발전방식 중 하나인 용융탄산염형 연료전지(Molten Carbonate Fuel Cell, 이하 MCFC) 발전시스템에서 생성된 전력을 계통에 안정적으로 변환, 주입하기 위한 계통연계형 전력변환기를 설계, 제작하고 성능 시험을 수행한 결과이다. 250kW급 MCFC 시스템의 정격 사양 및 스택의 운전 형태를 기반으로 250kW급 전력변환기 구조 및 단위기기를 설계하였고 전력변환기는 크게 DC/DC 컨버터부와 DC/AC 인버터부로 구성된다. 본 논문은 MCFC 발전 시스템에 적용되는 전력변환기(Power Conditioning System, 이하 PCS)를 제작하고 성능을 확인하는데 목적이 있다.

Even though the existing train route controlling method, using track circuits, ensures the sufficient number of operation, it still has problems such as discordance between train numbers which was planned for operating and train numbers being operated on the track, and allowing only one train entering for one route. To solve those problems, we study and develop the Smart train route controlling system which uses the real-time informations of train positions. This system enables improve the coefficient of utilization in a certain train route controlling section, and the safety level of train route controlling, but we should ensure satisfying reliability of data about tracks operated by trains. In addition, there is a need to protect accidents caused by erroneous information of train position, by reflecting changes of tracks, for example maintenance, improvement, expansion of tracks. In this paper, we describes data structure of a developed program which required to change CAD files to wiring diagrams and to generate them to data of tracks. And we show the result that the simulator, using the data structure, controls speed and route of trains without problems.

Developing the energy storage system is to save the money. Most of all, considering point before developing the system is where the system is installed. Therefore, in the paper, installing point of the system are reviewed.

무선통신을 적용하여 최첨단 무인자동운전을 구현하기 위하여 기존 고정폐색의 신호시스템과 달리 무선에 의한 양방향 통신을 기본으로 하는 이동폐색시스템인 CBTC(Communication Based Train Control) System을 적용하고 있다. 이를 구현하기 위하여 열차의 위치를 검지하는 기법으로 TOA(Time of Arrival)을 적용하였으며 이를 토대로 시험선의 선로변에 설치한 무선기(Wayside Radio Set : WRS)와 차량에 설치된 차상 무선기(Vehicle Radio Set : VRS)가 무선통신을 수행하고 지상에서 측정거리 결과로부터 열차의 위치를 계산되는 것으로 WRS와 VRS간의 거리에 따라 비례하여 증가하는 것을 확인하였고 아울러 측정거리지점에서의 품질이 우수함을 확인하였다.