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장석명(Seok-Myeong Jang),고경진(Kyoung-Jin Ko),최장영(Jang-Young Choi),박지훈(Ji-Hoon Park),이성호(Sung-Ho Lee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
Nowadays more attention is paid to the developing high efficiency electrical machines for energy saving and protection of natural resources. In general, the electromagnetic losses appearing in electrical machines are widely classified into copper loss, core loss and rotor loss. Particularly, in permanent magnet (PM) machines, core loss forms a larger portion of the total losses than in another machine. So, satisfactory prediction of core loss at the design or analysis stage of PM machines is essential to active high efficiency and high performance. This paper deals with analysis of magnetic field distribution due to geometry of stator core for magnetic core loss calculation of multi-pole PM synchronous machine.
슬롯리스 영구자석 동기 전동기의 와전류 손실에 의한 드래그 토크 예측
장석명(Seok-Myeong Jang),이운호(Un-Ho Lee),최장영(Jang-Young Choi),박지훈(Ji-Hoon Park),고경진(Kyoung-Jin Ko),최지환(Ji-Hwan Choi) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
The torque is very essential for performance evaluation of electric machines because it is directly connected with power loss for dynamic characteristics, To evaluate dynamic performance, the torque with harmonic component according to time is introduced Especially, eddy current loss is significantly increased in high speed so it is difficult to express the dynamic characteristic without reflection about losses, Therefore, in this paper, rotor eddy current loss wave is derived by fast fourier transform(FFT) which is using the phase current wave obtained from finite element analysis(FEA) according to two conditions; one has rotor eddy current loss, the other is not. The core loss is deduced by a modified Steinmetz equation(MSE) and additional losses are considered from an experiment. Those losses are worked as drag torque which is inverse force to performance of a machine. The operating torque estimated from difference between drag torque and electric torque is closely reflects the dynamic characteristics.
300마력 60000rpm급 초고속 전동기의 실측 전류 파형을 고려한 손실 특성 해석
장석명(Seok-Myeong Jang),한철(Cheol Han),고경진(Kyoung-Jin Ko),이용복(Yong-Bok Lee),김태호(Tea-Ho Kim),이성호(Sung-Ho Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper deals with comparison and analysis for various losses of high-speed permanent magnet synchronous motor using phase current harmonic analysis. Through measured current wave, various losses are calculated and compared with losses according to current sine wave. Poynting vector, Steinmetz equation, finite element method and so on have been used to investigate the losses of high-speed permanent magnet machine.
공간고조파법을 이용한 풍력용 영구자석형 발전기의 전자기적 특성해석 및 제어정수 도출
장석명(Seok-Myeong Jang),최장영(Jang-Young Choi),조한욱(Han-Wook Cho),유대준(Dae-Joon You),경남호(Nam-Ho Kyung),윤기갑(Ki-Kab Yoon) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Using the MATLAB/SIMULINK, this paper presents dynamic simulation model for 6㎿ wind power generation systems with the DFIG considering distribution systems and performs the dynamic analysis of wind power systems.
장호수(Ho Su Jang),박우열(Woo Yeol Park),박동삼(Dong Sam Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The cutting method using the ultrasonic wave which cutting by applying high frequency vibrational energy into specific area at constant pressure. Ultrasonic cutting is consisted of power supply, transducer, booster, and cutting tool. Precise designing is required since each parts shape, length and mass can affect driving frequency and vibration mode. This paper focused to cutting tool design, its length L was set by Calculating vibration equation. And the value of the shape parameter b was diversified as the integral multiple and the result of 39,863Hz the analysis of Modal was shown in the length 22mm of the result of performance b in the 11th mode Also by performing harmonic response analysis, the frequency response result was 39,867Hz, which was similar to modal analysis result.
자기등가회로법을 이용한 매입형 영구자석 전동기의 토크 해석
장석명(Seok-Myeong Jang),황선익(Seon-Ik Hwang),박유섭(Yu-Seop Park),최장영(Jang-Young Choi),서진호(Jin-Ho Seo) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper deals with d, q-axis inductance derivation and torque calculation of interior permanent magnet synchronous motor (IPMSM). Applying equivalent magnet circuit, magnetic flux linkage and d, q-axis inductance are obtained. With those results, magnetic torque and reluctance torque are calculated. In addition, this results are compared and analyzed with 2-d finite element analysis (FEA) to validate this paper.
장호면(Ho-Myun Jang) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.3
공동주택 하자는 유지보수에 막대한 비용이 들어가게 되며, 발주자, 시공자 그리고 입주자 등에게 심각한 피해를 입힌다. 이에 따라 하자분쟁을 최소화하고 철저한 품질관리를 통한 체계적이고 효율적인 하자관리를 위한 토대를 마련할 필요가 있다. 본 연구에서는 하자분쟁사례를 활용하여 공동주택의 공종/부위/현상에 따른 하자분류체계를 도출하고, 이를 기반으로 하자유형별 하자위험을 평가할 수 있는 방안을 제시하였다. 이를 위하여 본 논문에서는 경과년수 10년 이상 공동주택 하자분쟁사례 34건, 약 6000여개의 하자항목 자료를 토대로 분석을 실시하였다. 분석 결과를 정리하면, 하자분류체계는 하자공종, 하자부위 및 하자현상으로 크게 분류한 후 세부적으로 총 157개 항목으로 세분화하였다. 하자분류체계를 토대로 하자빈도, 하자비용 및 하자위험을 분석한 결과, RC공사 및 마감공사에 하자위험이 상당히 집중되어 있는 것으로 확인되었다. 이에 따라 이러한 하자위험에 대한 하자예방 활동이 우선적으로 고려되어야 할 것으로 판단된다. 본 연구를 토대로 하자위험을 관리할 수 있는 방안에 대한 추가적인 연구가 필요할 것으로 판단된다. In general, defects cause a lot of maintenance costs and serious damage to various stakeholders, such as the owners, contractors or occupants of apartments. For this reason, a systematic and efficient defect management method is needed to minimize defect disputes. This paper derives a defect classification framework and proposes a defect risk assessment model for different types of defects. For this purpose, 6,000 defect items are allocated to the defect classification framework; these items are associated with 34 apartment projects over ten years old. As a result of this analysis, it was confirmed that the defect risks are concentrated in the areas of RC and finishing work. Based on these results, it is necessary to prevent the major risks of defects according to their priority. Based on this research, it is judged that further research to develop a method of managing the risks of defects may be necessary.