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저심도 도시철도용 개별 모터의 횡변위 복원력제어를 통한 틸팅력 보상 알고리즘 제어 전략
원준희(Jun-Hui Won),노영우(Young-Woo Noh),오승택(Seung-Taek Oh),이주(Ju Lee) 대한전기학회 2019 전기학회논문지 Vol.68 No.12
In connection with the introduction of new public transportation due to urbanization, research on low-depth urban railways has been actively conducted. When the independently driving type is applied to such a low-depth urban railway, the independent torque control of the left and right wheels can be performed independently, but the mechanical resilience is weak because there is no wheeling. In order to make up for this drawback, a control method through the lateral displacement restoring force is proposed. It is proposed to an algorithm that makes restoring force stronger by controlling each motor of left and right wheels individually. This algorithm is also verified through MATLAB / SIMULINK.
고장 발생 시 이중 권선 전동기의 권선 배치에 따른 토크 리플 연구
김용철(Yongchul Kim),노영우(Youngwoo Noh) 한국조명·전기설비학회 2024 조명·전기설비학회논문지 Vol.38 No.1
As automotive steering technology advances and becomes electrified, high-level safety designs such as fault-tolerant or fault-operation are required to maintain the primary function even when a failure occurs. For this purpose, a dual-winding electric motor was introduced in the steering system, making it possible to maintain the driver’s steering assistance function even in the event of breakdown cases. Dual-winding motors can take into account various winding arrangements depending on the pole-slot combination of machines, and accordingly, when driven with only one 3-phase winding, non-uniformity of the magnetic flux linkage to the phase windings may occur and eventually lead to different magnitudes of mutual inductance. This paper presents a mathematical model of dual-winding motors and studies how the imbalance of mutual inductance for each winding arrangement affects the characteristics of the electric machine. As a result, it was derived through the calculation results of the mathematical model that the electrical secondary torque ripple appears significantly in the winding method where the mutual inductance imbalance is significant, and the validity of the calculation results of the mathematical model was proven by comparing it with the finite element analysis results.
연료전지 자동차용 이산화탄소 열펌프 시스템에서의 냉방 성능에 관한 실험적 연구
김성철(Kim, Sungchul),박민수(Park, Minsoo),김민수(Kim, Min Soo),황인철(Hwang, Inchul),노영우(Noh, Youngwoo),박문수(Park, Moonsoo) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
This experimental study presents the results of the cooling performance test of a CO₂ heat pump system for fuel cell vehicles. The experimental facility provides the cool ing and heating environment for cabin and heat releasing component. The test loop is designed to target the cooling capacity of 5kW and its coefficient of performance (COP) of 2.2. The cooling performance of the heat pump system is strongly dependent on the refrigerant charge and the degree of superheat. We carried out basic experiments to obtain optimum refrigerant charge and the degree of superheat level at the internal heat exchanger outlet. The heat pump system for fuel cell vehicles is different from that of engine-driven vehicles, where the former has an electricity-driven compressor and the latter has the belt-driven (engine-driven) compressor. In the fuel cell vehicle, the compressor speed is an independent operating parameter and it is controlled to meet the cooling/heating loads. Experiments were carried out at cooling mode with respect to the compressor speed and the incoming outdoor air speed. The results obtained in this study can provide the fundamental cool ing performance data using the CO₂ heat pump system for fuel cell vehicles.