• The Transactions of the Korean Institute of Electrical Engineers B
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• v.49 no.3
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• pp.159-164
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• 2000

This paper treats the optimization of rotor construction in the permanent magnet synchronous motor (PMSM) for electric vehicle (EV). While the field system of PMSM has generally one magnet per pole, we replace the magnet into plural sub-magnets. The dimensions of each sub-magnet are determined by the concept of pulse width modulation (PWM). By adopting the proposed rotor construction, we can not only reduce the space harmonics of the air-gap field but also provide space for rotor bars (i.e., damper windings) around the direct-axis. From the investigation by hybrid EE-BE (coupled finite element and boundary element) method coupled with both electric circuit and motion equation, we verify that the construction is effective for practical use.

• KEPCO Journal on Electric Power and Energy
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• v.1 no.1
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• pp.181-188
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• 2015

The non-contact permanent magnet gear has advantages of high efficiency and improved reliability. It has other advantages of no mechanical friction loss, very little noise and vibration, and no need for lubricant. With these advantages, the non-contact permanent magnet gear that solves the physical contact problem of the mechanical gear has drawn attention. Due to this unique non-contact characteristic, the non-contact permanent magnet gear which is capable of non-contact torque transmission has replaced mechanical gear. The mechanical gears which is in many fields of the modern industry, is used mostly for power transmitting mechanical devices. However, it also has the problem of a low torque density, which requires improvement. In this paper, a novel pole piece shape is proposed in order to improve the problem of low torque density of the non-contact permanent magnet gear. The experiment data required for predicting the relationships among them are obtained using finiteelement Operating method based on two-dimensional (2-D) numerical analysis. Therefore, this paper derived an optimal model for thenon-contact permanent magnet gear with the novel pole piece using the Box-Behnken design, and the validity of the optimal design of the proposed pole piece shape through variance analysis and regression analysis demonstrated. In this paper, we performed the thransfer torque analysis in order to improve the torque density and power density, we have performed on optimal design of proposed pole piece shape using box-behnken.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.54 no.11
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• pp.511-518
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• 2005

This paper presents the design and drive characteristics of a switched reluctance motor for an electric power pallet vehicle. The designed switched reluctance motor is redesigned by using the finite element analysis(FEA) as a variation of the pole-arc angle for the purpose of an electric power pallet vehicle performance. The output power and torque characteristics of a switched reluctance motor are variable by switching angles of the commutator. Therefor this paper is studied about relationship between the output power and torque characteristics of a switched reluctance motor according to switching angles. The output power of the characteristic point of an electric power pallet vehicle has been shown by experiment. The designed motor drive system operates with the low voltage and high current with using the battery. The core and frame temperatures were described. In this paper, the designed motor is shown better drive characteristics than the DC motor from the rated to maximum, which is verified by the finite element analysis and experimental results.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2708-2710
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• 2001

한전에서는 판매업무의 혁신을 기하기 위하여 지리정보시스템(GIS)을 운영기반으로 하는 신배전정보시스템(NDIS : New Distribution Information System) 구축사업을 적극적으로 추진하여 현재 일부 지사 지점에서 시범운영중에 있으며, 향후 전국적인 운영확산이 예정되어 있다. NDIS에서는 국가기본도를 GIS의 기초도면으로 활용하고 있으나 DB구축시 기존 설비도면과의 상대위치오차가 발생되고, 설비가 누락 또는 오분류되어 있는 경우가 있어 이를 보정하는데 많은 노력이 드는 실정이다. 국가기본도 사용을 전제할 때 이러한 문제점은 피할 수 없는 현상이며, 한전에서는 이를 보다 효과적으로 해결하고자 배전설비에서 위치의 기준이 되는 전주를 중심으로 기초도면 변경에 따른 설비도면 보정기법연구와 시스템 개발을 수행하였다. 본고에서는 한전에서의 설비도 위치보정 적용환경과 함께 연구개발된 내용을 소개하고자 한다.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.4B no.4
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• pp.157-169
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• 2004

Motor & generator operation at widely variable speeds is needed in various applications but hybrid and electric vehicle (HEV) stand out today, as quite a few companies are launching this year their mass production of HEVs. The quest for better starter-generators is far from ended, though. The present review paper unfolds a comparative critical evaluation of various starter-generators and their control for HEV. Induction, interior PM synchronous, transverse-flux PM synchronous, switched reluctance, together with claw-pole and biaxial excitation PM synchronous (BEGA) configurations with their control are all considered in system evaluations.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2011.06a
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• pp.219-220
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• 2011

In this paper the construction of vibration isolator using induction motor and its experiments are introduced. The vibration isolator is composed by plate, crank, electric motor and laser sensor to measure the displacement of plate. A control scheme to isolate the vibration signals due to the load variance and disturbance is designed with pole-placement and Routh-Huritz method. Experiments are also applied to confirm the effectiveness of the proposed control scheme.

• Korean Journal of Crystallography
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• v.12 no.4
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• pp.227-232
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• 2001

Structure-physical properties relationships for Aurivillius ceramics are discussed, with empha-sis in symmetry considerations. Single-crystal materials and polycrystal ceramics are analysed. Electric and magnetic coupling properties are considered. Colour Symmetry Groups and Texture Analysis tool are emploed. Symmetry conditions for polarisation vectors and inverse pole figures related to Aurivillius phases are given. The influence of crystallographic texture of the physical properties of polycrystalline Aurivillius ceramics is evaluated.

• Proceedings of the KIEE Conference
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• 2004.10a
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• pp.107-109
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• 2004

Stepping motors are widely used for various electric instruments. In case of analysing claw pole PM slopping motor 3-dimensional analysis is necessary for accurate field calculation. This paper presents static torque characteristics of a permanent magnet type stepping motor with claw poles using three-dimensional finite element analysis.

• Proceedings of the KIEE Conference
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• 1998.07c
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• pp.939-942
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• 1998

This paper presents the process on the construction for the remote distribution pole transformer monitoring system. Especially, this system uses CATV cable as communication media which is located in KEPCO's main distribution line. It has four major components such as sensor for measuring secondary voltage and currents of distribution transformer, RF modem for data modulating/de-modulating, communication media for sending/receiving of data, and pc server for monitoring the results of sensing or computing information. This paper also describes the configuration of these each component's configuration and its functions.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10b
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• pp.446-448
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• 2000

본 논문에서는 배전설비도면의 주요 기호인 전주와 전선인식 방법에 관하여 기술한다. 본 논문에서는 원형성에 근거하여 전주후보를 추출한 후 이들 사이의 연결성에 근거하여 전선을 인식한 다음, 전주후보들 중에서 전주를 확인함으로서 전주와 전선을 인식하는 방법을 제안한다. 제안된 방법은 한국전력공사의 배전설비도면들 중에서 무작위로 추출한 표본 약 30매를 대상으로 실험하고 그 결과를 제시한다.