• 한국자동차공학회논문집
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• 제6권4호
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• pp.39-46
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• 1998

For permanent magnet brushless DC motors used for high speed fuel pumps, torque ripple is an important origin of vibration, acoustic noise and speed fluctuation. In this paper, the output torque profile of a PM motor with one phase energized is decomposed into the commutation torque, the reluctance torque and the armature reaction torque according to their source origins. It verifies that the output torque profile is qualitatively equivalent to the BEMF profile for low reluctance motors. This paper discusses the effect of magnet pole shaping and magnet arc length on the output torque and torque ripple. A magnet edge shaping is proposed to design a trapezoidal BEMF motor without torque ripple, with minimal sacrifice of the maximum output torque.

• 한국자동차공학회논문집
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• 제21권4호
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• pp.188-194
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• 2013

Hydrostatic pumps and motors occupy an important position in hydraulic system. There are a lot of researches on characteristics of hydraulic pumps, but not hydraulic motors. So in order to know the characteristics of hydraulic motors we had this research. The purpose of this study is to derive and analyze the theoretical calculation of hydraulic axial piston motor torque and torque ripples. Then, analyzed the differences between torque ripples with dead place and without dead place on the valve plate, and modeling a hydraulic motor with AMESim software. Finally, theoretical calculation of hydraulic motor torque ripples was verified from the viewpoint of simulation.

• 한국항만경제학회지
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• 제35권4호
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• pp.147-168
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• 2019

본 논문은 평택당진항의 자동차 물류 클러스터 구축방안을 모색하는데 있다. 평택당진항은 자동차 관련 부가가치 물류서비스를 바탕으로 활성화되고 발전할 필요가 있기 때문이다. 각 지자체마다 앞다퉈 자동차 관련 산업단지 육성에 나서고 있다. 또한 향후 국산 자동차 수출 전망은 어둡지만 평택당진항을 비롯한 여러 항만이 수출입과 환적 자동차를 유치하기 위해 부두시설을 확충하는 등 자동차 항만으로서 위상을 확보하기 위해 부단히 노력하고 있다. 평택당진항은 현재 1위 자동차 항만으로서 자동차 물류 클러스터를 구축하기 위한 좋은 여건을 갖추고 있다. 쌍용자동차와 기아자동차, 그리고 삼성전자와 LG전자가 가까이 위치하고 있고, 향후 항만배후단지 개발을 통하여 충분히 자동차 물류 클러스터 구축에 소요되는 부지를 용이하게 확보할 수 있기 때문이다. 단순한 물류 거점으로서만이 아니라 다양한 문화와 체험이 가능한 자동차 물류거점을 조성함으로써 미래 모빌리티 발전에 적절하게 대응할 수 있도록 함으로써 평택당진항의 지속가능한 발전을 도모할 수 있다.

• Journal of Power Electronics
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• 제5권2호
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• pp.120-128
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• 2005

This paper deals with the analysis of switched reluctance motor drives for different drive circuit topologies used in automobile. So we attempt to improve the weaknesses associated with the asymmetric bridge converter in the limited internal environment of automotive application. Two kinds of c-dump converters are tested in terms of dump capacitor voltage, speed response according to the variation of advance angle and efficiency for the radiator cooling-fan drive of an automobile. They enable more economical and efficient converter topology for automobile industries. This paper describes the performance characteristics of 12V-250W-3000rpm SRM drives for automotive application. Computer simulation and experiment results are then presented to verify the performance of the two kinds of c-dump converters.

• 한국자동차공학회논문집
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• 제13권1호
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• pp.184-193
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• 2005

Digital representations of products and parts have largely replaced physical drawings as the form in which product data are stored, analyzed, and communicated among the people contributing to the design of an automobile. Many individuals and companies participate in the design of an increasingly complex automobile; hence, the design process depends critically on team members' ability to share information about essential design elements. These trends have elevated the importance of the quality of product data and its efficient exchange. In this paper, we show state-of-the-art on Product Data Quality(PDQ), and activities of PDQ assurance. And we propose a novel design history-based approach for diagnosis and healing of a CAD model.

• 센서학회지
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• 제22권3호
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• pp.191-196
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• 2013

A particulate matter sensor fabricated by MEMS process is proposed. It is developed to accommodate Euro6 on-board diagnostics regulation for diesel automobile. In the regulation, emission of diesel particulate matter is restricted to 9 mg/km. Particulate matter sensor is designed to use induced charges by charged particulate matter. To increase sensitivity of the sensor, groove is formed on sensor surface because wider surface area generates more induced charges. Sensitivity of the sensor is measured 10.6 mV/(mg/km) and the sensor shows good linearity up to 15.7 mg/km. Also its minimum detectable range is about 0.25 mg/km. It is suitable to detect failure of a diesel particulate filter which should filter particulate matter more than 9 mg/km. For removing accumulated particulate matter on the sensor which can disturb normal operation, platinum heater is designed on the backside of the sensor. The developed sensor can sense very low amount of particulate matter from exhaust gas in real-time with good linearity.

• 한국자동차공학회논문집
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• 제23권5호
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• pp.537-544
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• 2015

The effects of the modification of hybrid vehicle components on diesel exhaust emissions were investigated in this study. We examined the changes in exhaust emissions and the fuel consumption (FC) caused by the modification of generator (alternator) and motors. Exhaust emissions such as black carbon (BC), HC, $NO_X$ and $CO_2$ were measured not only in idle state but also on an actual urban road as well as on a chassis dynamometer. BC, $NO_X$ and HC emissions increased by 95%, 27% and 34% respectively when the generator charged the battery in the idle condition. BC and FC decreased in hybrid mode on the actual urban road partly because the motors were used to assist the diesel engine. In addition, the decreases in exhaust emissions and FC were also evident in the hybrid mode when the vehicle was tested on the chassis dynamometer.

• 한국인터넷방송통신학회논문지
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• 제22권1호
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• pp.181-186
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• 2022

세계 전기자동차 분야는 기술적 환경변화를 넘어서 시장 환경에까지 영향을 미치는 단계로 전환하여 완성차업체들은 "기술 우위 → 브랜드 제고 → 기존 내연기관 차량의 판매 확대"라는 기존 전략에서 시장경쟁력 제고라는 전기자동차 시장 자체의 확대로 전환되고 있다. 또한 전기자동차 부품시장은 기존 부품업체들의 사업영역 확대와 신규업체들의 진입으로 경쟁이 심화될 전망이며, 전기자동차 주요 부품의 효율성 향상을 위해 개발 협력도 활발히 진행될 전망이다. 이러한 전망과 함께 전기자동차가 성장할수록 자동차 산업의 전반적인 구조적 변화가 예상됨에 따라 배터리, 파워트레인(모터, 전력관리 제어시스템), 전기차 생산, 충전 인프라 등 전기자동차 Value Chain 전반의 성장이 예상된다. 따라서 본 논문에서는 변화되고 있는 전기자동차 산업의 발맞춰 기업이 원하는 다양한 고급인력을 양성하기 위해 전기자동차의 에너지 및 전기 요소기술을 선도하는 인력양성 알고리즘을 연구한다.

• 한국자동차공학회논문집
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• 제6권2호
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• pp.235-243
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• 1998

For motor operation at low speeds and loads, torque pulsation by the cogging torque is often a source of vibration and control difficulty. In this paper, the magnetic field of a motor is calculated by finite element method. The periodic cogging torque is determined using Maxwell stress method and time stepping method, and then decomposed using fourier series expansion, The purpose of this paper is to characterize design parameters on the cogging torque and to design a permanent magnet motor with a cogging torque less vulnerable to vibration, without sacrificing the motor performance. The design parameters include stator slot width, permanent magnet slot width, airgap length and magnetization direction. A new design with a less populated frequency spectrum of the cogging torque is proposed after characterizing individual effect of design parameters. Magnet pole edge shaping, by gradually increasing the cogging torque with reduced higher harmonics.

• 한국신뢰성학회지:신뢰성응용연구
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• 제9권3호
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• pp.195-218
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• 2009

Wiper motors are used in every automobile. They are exposed to a very diverse environment and consists of several components and, therefore needs careful approach to the enhancement and assessment of reliability of the item. In this article reliability standards for wiper motors are established in terms of quality certification test and failure rate test.