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릴럭턴스 토크를 활용한 소형 BLDC 팬 모터 효율 향상을 위한 설계
김회천(Hoe-Cheon Kim),윤승주(Seung-ju Yun),정태욱(Tae-Uk Jung) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
In this paper, a small BLDC Fan motor for the research was to improve the efficiency. The existing BLDC motor was designed for rotor core shape with the salient-pole type inside the permanent magnet. Thus, the reluctance torque was applied additionally. The magnetic field of a BLDC Fan motor was calculated by finite element method(FEM).
김회천(Hoe-Cheon Kim),정태욱(Tae-Uk Jung) 대한전기학회 2012 전기학회논문지 Vol.61 No.7
This paper studied about the measurement method of the instantaneous dynamic load characteristics. this experimental study, we derived the instantaneous washing load characteristics and inertial moment characteristics according to the amount of laundry and water level. Also, this studied about the dynamic driving characteristics simulation method for the prediction of washing performance based on this load characteristics analysis. For this study, the design parameters of the driving motor are obtained by FEM analysis and the experiment. By using theses motor parameters and load characteristics, the instantaneous driving characteristics simulation is accomplished and it is verified with the experimental result of various driving conditions. The results of this paper would be very useful to the prediction of washing mode operation characteristics, and it can be also utilized to the washer motor control algorithm design for the washing performance improvement.
김회천(Hoe-Cheon Kim),정태욱(Tae-Uk Jung) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.11
Recently, permanent magnet synchronous motor are applied to various applications. Because of the importance of high reliable operation in these areas, many research related to the fault detection and diagnosis of inverter system are conducted. So, a faults model for an inverter-driven permanent magnet synchronous motor is studied by using the fault current of motor according to switch open, which can be effectively used for performance evaluation of the diagnostic algorithm. And fault of the permanent magnet synchronous motor inverter drive system is divided into four types. The feasibility of the proposed method are improved by simulation and experiment.
영구자석 오버행 구조를 가진 소형 BLDC 모터의 2차원 해석 접근 방법
김회천(Hoe-Cheon Kim),정태욱(Tae-Uk Jung) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.7
This paper deals with the characteristic analysis of small power brushless DC (BLDC) motor considering the rotor magnet overhang flux. In the driving characteristics analysis using 2D FEA (Finite Element Analysis), the rotor magnet overhang effect can’t be considered and it should be neglected. To consider rotor magnet overhang effect, 3D FEA should be required. But 3D FEA requires very long calculation time even though the high specification computer is used. In this paper, the 3D electromagnetic model of BLDC motor is approximated as the 2D electromagnetic model considering overhang effect. In this paper, the concept of overhang coefficient is applied, and the coefficient according to load torque variance is deduced.
펌프용 소형 BLDC 모터의 원가절감을 고려한 회전자 최적화 설계
김회천(Hoe-Cheon Kim),정태욱(Tae-Uk Jung) 대한전기학회 2013 전기학회논문지 Vol.62 No.4
In the present study, a BLDC motor for a pump in which a neodymium PM is replaced with a Ferrite PM has been developed in preparation for the cost increase and to ensure the stability of the resource supply. One of the currently used motors for pumps is a BLDC motor having an interior PM wherein a rare-earth PM is adopted. However, a BLDC motor for a pump is designed to have large airgap because of the use of a waterproof insulator according to its structural characteristics, and therefore, a SPM structure is suitable. Hence, an SPM BLDC motor in which a Ferrite PM is used is designed. Nevertheless, the use of Ferrite instead of rare-earth materials causes a deterioration in the performance of the electric motor, such as a decrease in the BEMF and the maximum power of the motor and the irreversible demagnetization of the PM. In order to mitigate such disadvantages, an optimized design of the BLDC motor is developed by changing each design parameter and by improving the electromagnetism structure.
김회천(Hoe-Cheon Kim),손장열(Jang-Yeul Sohn),박형주(Hyung-Ju Park) 한국생활환경학회 2006 한국생활환경학회지 Vol.13 No.4
Due to a change in residential environment, apartment houses have become a main housing style, and the number of fire outbreaks and the resultant damage are increasing each year. The fire in the apartment is not restricted to the level of the origin, spreading to the upper levels, and resulting in greater damage. Since installing a balcony can significantly reduce the spread of fire, fire spread to the upper levels was confirmed, comparing the cases with and without balcony extension, through site experiment and full scale model experiment in this paper. It was confirmed that the fire can spread not only to the next higher level but also to two levels higher due to the outburst of flame which reached a significant temperature in the case without balcony, while the possibility of fire spread to the upper level reduced considerably with the balcony. As above, it was confirmed that balcony not only functioned as a buffer space, which connects the inside and outside of a building, but also provided a significant function to prevent the fire spread to the upper levels.
김회천(Hoe-Cheon Kim),손장열(Jang-Yeul Sohn),박형주(Hyung-Ju Park) 대한설비공학회 2007 설비공학 논문집 Vol.19 No.3
In the case of the fire outburst within a partitioned space, it can disappear inside it through smoldering process if the fire cannot obtain sufficient imflammability. On the contrary, if it obtains it, the fire is not restricted within the room, spreading to the higher levels beyond outside windows and the compartment room. The : method to prevent the fire spread through windows is considered to build a balcony or equip with sprinkler facilities. This case study is to identify which effects and controlibility a balcony brings about on the spread of fire through a full scale model experiment. In order to understand the effects of fire spread on the upper levels of the room on fire by changing the length of balcony, the temperature was measured, radiant heat was investigated, and products of combustion were analyzed. The result showed that when fire occured, longer length of the balcony, which linked to the outside wall of the apartments, led to the blocking of the fire spread, lower level of radiant heat, and significantly less transfer of toxic gases, and the driving force of the outburst of flame was identified as the attractive force due to the turbulence of uncombusted gases, which exist on the upper level of the outbursting flame.
김회천(Hoe-Cheon Kim),김지은(Ji-Eun Kim),고희석(Hee-Seok koh),정태욱(Tae-Uk Jung) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
In this paper, the Interior Permanent Magnet Generator utilizing the power of the robot engine was designed. We designed considering the required power of the auxiliary power to be also used in robot. The rotor which is suitable for the high speed operation was designed. And the generator which utilized this finite element method (FEM) and can deliver the optimum output to the auxiliary power was designed.