• 한국전자통신학회논문지
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• 제12권1호
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• pp.93-100
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• 2017

자동차 엔진은 연료 주입, 압축, 폭발, 배기 등의 4행정의 내연기관을 탑재하고 있으며 압축압력, 점화불꽃 및 혼합비의 조건이 맞아야 기동이 유지된다. 실린더의 기밀과 관련된 압축행정과 폭발행정에서 압축압력이 정상적으로 유지되지 않으면 엔진의 정상적인 기동을 보장할 수 없다. 본 연구에서는 크랭크인 시(시동거는 시간)에 배터리에서 시동모터에 공급되는 전류파형의 분석을 통해 각 실린더 내의 상대 압축압력의 상태를 판단하는 장치의 개발에 대하여 기술한다.

• International Journal of Automotive Technology
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• 제2권2호
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• pp.63-75
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• 2001

This paper describes the development of THC reduction technologies compliant with SULEV regulations. Technologies embodied by the developmental work include improvement of fuel spray atomization, quick warm-up through coolant control shut of, and acceleration of fuel atomization for the fast rise of cylinder head temp inside the water jacket as well as the improvement of combustion state. The technologies likewise entail reduced HC while operating in lean A/F condition during engine warm-up with the cold lean burn technology, individual cylinder A/F control for improvement of catalytic converting efficiency, after-treatment such as thin-wall catalyst, HC-adsorber and EHC and etc, through vehicle application evaluation in cold start. We carried out an experimental as well as a practical study against SULEV regulations, and the feasibility of adopting these items in vehicle was likewise investigated.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.2464-2466
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• 2000

When linear PI controller is used in speed control of induction motor, there happen some weaks which is very difficult to find optimal control gain at time of changing speed and load. In this paper, Fuzzy system incorporated with PI controller is proposed in order to that defects. PI gain is calculated by theoretical basis and fuzzy control is translated human expert's knowledge and experiences into rules numerically. Also it modifies and compensates PI gains in realtime. As comparing the motor characteristics of proposed fuzzy-PI speed controller to PI speed controller of a Vector controlled induction motor system in the increasing load torque and speed change during start and stop, The simulation results show robust and good performance.

• Journal of Power Electronics
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• 제4권4호
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• pp.217-227
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• 2004

A robust controller that combines the merits of the feed-back, feed-forward and model-following control for induction motor drives utilizing field orientation control is designed in this paper. The proposed controller is a two-degrees-of­freedom (2DOF) integral plus proportional & rate feedback (I-PD) speed controller combined with a model-following (2DOF I-PD MFC) speed controller. A systematic mathematical procedure is derived to find the parameters of the 2DOF I-PD MFC speed controller according to certain specifications for the drive system. Initially, we start with the I-PD feed­back controller design, then we add the feed-forward controller. These two controllers combine to form the 2DOF I-PD speed controller. To realize high dynamic performance for disturbance rejection and set point tracking characterisitics, a MFC controller is designed and added to the 2DOF I-PD controller. This combination is called a 2DOF I-PD MFC speed controller. We then study the effect of the 2DOF I-PD MFC speed controller on the performance of the drive system under different operating conditions. A computer simulation is also run to demonstrate the effectiveness of the proposed controller. The results verify that the proposed 2DOF I-PD MFC controller is more accurate and more reliable in the presence of load disturbance and motor parameter variations than a 2DOF I-PD controller without a MFC. Also, the proposed controller grants rapid and accurate responses to the reference model, regardless of whether a load disturbance is imposed or the induction machine parameters vary.

• 조명전기설비학회논문지
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• 제22권5호
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• pp.73-79
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• 2008

본 논문에서는 단상 유도전동기의 전자식 기동장치 개발에 관해 연구하였다. 전자식 기동장치는 콘덴서 기동형 단상 유도전동기의 보조권선 회로에 장착된 원심력 스위치를 대체하기 위해 활용된다. 개발된 전자식 기동장치는 보조권선의 전압을 관측하여 전동기가 정격속도에 가까워지면 보조권선을 전원으로부터 개방하는 역할을 수행한다. 범용 단상 유도전동기에 사용되고 있는 원심력스위치는 기계식 접점을 사용하기 때문에 접점에서 불꽃이 발생하고 전동기의 수명과 신뢰성을 저감시키는 요인이 된다. 개발된 전자식 기동장치는 무접점 반도체 스위치인 트라이악을 적용함으로써 전동기의 신뢰성과 특성이 개선될 수 있으며, 저전압 및 반복실험 등의 다양한 실험을 통해 신뢰성을 검증하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.586-588
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• 2002

This study investigaties magnetic circuit design of the Line-Start Permanent Magnet Synchronous Motor (LSPM) for advanced reluctance torque in steady state. Back-emf and d-/q-axial inductance is analyzed by using 2 dimensional Finite Element Method (FEM). These results are reflected characteristic analysis of LSPM.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.967-968
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• 2011

직립 기동 영구자석 동기 전동기(Line-Start Permanet Magnet Synchronous Motor : LSPM)는 기존 3상 유도기에 비해 높은 효율과 역율을 가진다. 또한 제어기를 사용하지 않고 기동 할 수 있다는 장점 때문에 펌프나 팬 등에 단순한 구동원에 적용 할 수 있는 전동기이다. 구조는 유도기와 달리 영구자석이 매입되기 때문에 이에 따라 영구자석의 위치와 크기에 따라 모터의 특성이 변화 한다. 본 논문에서는 실험 계획법과 FEM 유한 요소법을 이용하여 영구자석의 크기는 고정되어 있는 상태에서 영구자석 슬롯의 모양만을 설계 인자에 따라 해석하였다. 그리고 해석을 통한 결과를 비교 분석하여 직립기동 영구자석 동기 전동기의 효율과 토크특성을 개선하고자한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 추계학술대회 논문집 학회본부
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• pp.83-86
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• 1991

This paper presents a method that optimizes the teeth shape of linear induction motor. Independent variables are x-coordinate change of four nodes at each tooth, and its objective function is thrust at start. As a result, linear induction motor with high quality which its thrust increases up to 10% per pole can be designed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 F
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• pp.1971-1973
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• 1997

Space Vector control of linear induction motor without speed sensor is one of the most up-to-date researching subjects to the engineers in the fields of power electronics and control theory. A conveyance SLIM (Single-sided Linear Induction Motor) has required a stable speed and a soft start/stop when the goods convey. So, the close loop control method to use a speed sensor have been adopted and as the speed sensor, a linear encorder has been used. But when the speed sensor used, the application boundary is limited and the confidence of system is diminished because it is sensitive to external environment variations and its cost is very expensive. So, to solve these problems, this paper deals with speed control of the conveyance SLIM using space vector without speed sensorless.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1067-1068
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• 2011

This paper deals with the method of starting characteristic analysis of a single-phase line-start permanent magnet (LSPM)motor. The starting characteristic such as current, torque and is important in LSPM because of demagnetizing of the permanent magnet. In this paper, the characteristic analysis is performed using finite element method.