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Design to Reduce Cost and Improve the Mechanical Durability of IPMSM in Traction Motors
이기덕,이주 한국조명.전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.5
The interior permanent-magnet synchronous motor (IPMSM) is often used for the traction motor of hybrid electric vehicles (HEVs) and electric vehicles (EVs) due to its high power density and wide speed range. This paper introduces the 120kW class IPMSM for traction motors in military trucks. This system, as a SHEV (series hybrid electric vehicle), requires a traction motor that can generate high torque. This study introduces a way to reduce costs by proposing a design approach that creates reluctance torque that can be maximized by varying the dq-axis inductance. If a model designed by a design approach meets the desired torque, the magnetic torque can be reduced by an amount equal to the increase in reluctance torque and consequently the amount of permanent magnets can be reduced. A reduction gear and high speed operation of motors are necessary for the miniaturization of the motor. Thus, a fairly large centrifugal force is generated due to the high speed rotation. This force causes mechanical interference between the rotor and the stator, and a design approach for adding an iron bridge is explained to solve the interference. In this study, the initial model and the improved model that reduces cost and improves mechanical durability are compared by FEA, and the models are produced. Finally, the FEM results were verified experimentally.
이기덕 한국국가정보학회 2013 국가정보연구 Vol.6 No.2
National Intelligence Studies is aimed systemizing the related knowledge of national intelligence activities to promote its systematic understanding, improving rationality and effectiveness, and offering its desired direction. Since 1990 when academia showed their interests in National Intelligence Studies, the subject has been considered as a new academic field. Currently, bringing reform to the national intelligence organization is a hot topic in Korea, and this enhances our need to develop National Intelligence Studies academically in order to nurture experts through improving education about theories and practices of national intelligence activities and to develop the organization in a desired direction. This research analyzes the development trend of National Intelligence Studies, the efforts of intelligence community for academic improvement specially in the advanced countries such as the U.S. and the U.K. Also, it exams the current situation of the intelligence study in Korea and suggests alternatives for academic development of National Intelligence Studies by applying advanced cases to our country. The alternatives this study suggests are: establishing a thinktank specialized in national intelligence study and education, securing an expanded national budget to support intelligence research, establishing a department of intelligence and expanding intelligence courses in universities, more support for the Korea Association of National Intelligence Studies(KANIS), developing special fields of National Intelligence Studies, training professors, adopting more National Intelligence Studies subjects in various government staff employment exams, and expanding more access to the research material. Thus, this paper emphasizes not only the government’s proactive support but also close cooperation between intelligence agencies and academia with an expect that this will contribute to academic development of National Intelligence Studies. 국가정보학은 국가의 정보활동을 체계적으로 이해할 수 있도록 관련지식을 체계화하고, 국가정보활동의 합리성과 효율성을 제고하는 한편, 국가정보활동이 지향해야 할 바람직한 방향을 제시해 준다. 1990년대 들어서서 학계에서 국가정보학에 대해 관심을 보이기 시작하면서 국가정보학은 새로운 학문분야로 다루어지기 시작하였다. 국가정보기관에 대한 개혁이 화두가 되고 있는 우리나라의 현 상황에서 국가정보활동에 대한 실무적용 가능한 이론연구와 교육 강화를 통해 관련 전문가를 양성하고, 국가정보기관이 바람직한 방향으로 발전해 나갈 수 있도록 하기 위해서 국가정보학의 학문적 발전이 절실하다. 본 연구는 정보선진국 특히 미국과 영국을 중심으로 국가정보학 발전동향과 학문적 발전을 위한 노력 등에 대해 분석하고 우리나라의 현 실태를 진단하는 한편, 선진국의 함의를 우리나라에 적용하여 국가정보학의 학문적 발전을 위한 대안들을 제시하였다. 본 논문에서 국가정보학의 학문적 발전을 위한 대안으로 국가정보 전문연구기관의 설치, 정부의 재정지원 확충, 대학 내 국가정보학과 개설과 강좌개설 등을제시하는 한편, 국가정보학회 지원, 국가정보학 각론 개발, 교수요원 양성, 공무원채용시험에 국가정보학 과목채택 확대, 연구자료에 대한 접근성 확대 등 정부차원에서의 적극적인 지원 조치와 함께 정보기관과 학계간의 긴밀한 협력의 필요성 등을강조하였는 바, 향후 국가정보학의 학문적 발전에 기여할 수 있길 기대한다.