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Performance Verification of a High Speed Motor-Generator for a Microturbine Generator
홍도관,주대석,우병철,정연호,구대현,안찬우,조윤현 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
The Research Institute is developing a motor-generator that fits into a microturbine generator (MTG) system with a power density of 500W. This paper introduces the design, analysis, production and assessment of the heart of an MTG system, the motor-generator,whereby an amorphous core is applied creatively to a stator core. The motor-generator is designed and analyzed with consideration to losses and the circuit by magnetic analysis. The centrifugal force analysis is performed for the static stability, and rotor dynamics is performed for dynamic stability at high speed. Back-to-back tests are done to assess the power generation characteristic of the motor-generator. The noise, vibration, and the internal temperature of the motor-generator are considered. Based on these results,a high speed motor-generator is successfully developed.
홍도관,안찬우,심재준,이상석,정영덕 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
The purpose of the present study is to deal with the development of a viscosity damper for the crank shaft system of a transporting machine using reverse engineering. A viscosity damper is developed to substitute import product. An engine simulator for performance evaluation has been produced to enable the control of engine speed using a PID controller and to evaluate the performance of several models by reverse engineering. Several prototypes are made according to the mass variation of an inertia ring. To evaluate the reduction effect of torsional vibration by viscosity damper, several sensors are used such as microphone, tri-axis accelerometer and the optical fibre sensor. In addition, order tracking and FFT (Fast Fourier Transform) analysis are performed by FFT analyzer and F/V converter according to speed increase (1,000~4,000 rpm). The viscosity damper for a high performance to reduce torsional vibration has been developed successfully using several designs, structural stability analysis and manufacturing techniques, as well as performance tests.
Development of an Ultra High Speed Permanent Magnet Synchronous Motor
홍도관,우병철,정연호,구대현,안찬우 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
To accomplish the research of a PM synchronous motor driven by 15 kW at a rated speed of 120 krpm. This paper represents an approach to minimize the eddy current losses that occur frequently at high speeds. Various simulation and testing techniques are applied to grasp the physical phenomena. Here, sleeve thickness is proposed parameter for analysis. Finally, this paper studies the developed model which represents a tendency for minimizing eddy current loss, von-Mises stress, unbalance vibration response and maximizing critical speed. It comes to the conclusion that sleeve thickness should be chosen after considering the function of mechanical stress, critical speed and unbalance vibration response of the rotor. The design efficiency is well suited to the efficiency test, having a maximum error of 2.7%.
Analysis of High Speed Induction Motor for Spindle Made by Copper Die Casting Process
홍도관,최재학,한필완,전연도,우병철,구대현 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
This paper deals with the analysis techniques of a high speed and high efficiency 10 kW, 30,000 rpm rated induction motor. The induction motor has been analyzed by time-varying magnetic finite element method and the test results show that there is a possibility that the motor could be used in a high speed spindle system application. All performances of the prototype are successfully verified. All analysis techniques are introduced to develop a high speed and high efficiency induction motor of copper die casting. The analysis techniques are composed of an electrical technique (magnetic analysis), and a mechanical technique (casting analysis, structural analysis, critical speed analysis and unbalance response analysis). Simulation results are compared with the experiment, and are within a 3% deviation.
홍도관,주대석,김지원,우병철,구대현 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
This study investigates the experimental validation of transverse flux linear motors (TFLMs) with permanent magnet excitation andthe dynamic simulation of the developed TFLM created using the optimal design. Our research challenge is to use the developed directdrive TFLM to substitute the rack and pinion in a rotary motor because the rack and pinion lacks speed and thrust. Theelectromagnetic field characteristics are calculated using 3D finite element method analyses, and the dynamic characteristics aresimulated using mechanical balance equations. After calculating the integral parameters, the dynamic behavior of the machine issimulated. The Matlab/Simulink model for solving motion equations is used. The peak currents obtained from simulations andexperiments are very closely matched within 1%, which is the estimation error. The structural stability is evaluated using structuralanalyses that consider the load and moment of a robot. In order to reduce the structure-borne noise radiated from the main drivingframe, damping materials are applied and the sound pressure level decreases by approximately 8.5 dB(A). Finally, the repetitiveposition accuracy is considered and measured using an API laser tracker T3. The measured repetitive position accuracy is within0.1 mm at a speed of 3 m/s.
보의 중간지지점 위치변화가 고유진동수에 미치는 영향에 관한 연구
홍도관,김동영,안찬우 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.2
We studied how it had an effect on natural frequency to change the location of a middle supporting point of beam. We put the supporting point of the beam into two to four, and compared natural frequencies obtained through FEA(Finite Element Analysis) with natural frequencies obtained through Numerical Analysis which uses the boundary conditions to each Equation of motion and consecutive conditions at each supported point. We found the results obtained Numerical Analysis almost agreed with FEA's. We present data to design structures so that resonance may not occur.
평판의 1차 고유진동수가 최대가 되는 점지지의 최적위치선정에 관한 연구
홍도관,김문경,Hong Do-Kwan,Kim Moon-Kyung 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.7
The free vibration analyses of the isotropic and CFRP laminated composite rectangular plates with point supports at the fix edge is performed by FEM. We showed optimal position and mode shape of point supports that maximized fundamental natural frequency of the isotropic and CFRP laminated composite rectangular plates by each aspect ratio and the number of point supports.