• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.775-776
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• 2006

Based on the requirement of high power and efficiency in automobile systems, this paper describes an investigation for the optimum design of a permanent magnet reluctance motor(PRM), and then the characteristics of this kind of motor is compared with that of a interior permanent magnet(IPM) motor. The IPM of 4-pole with 6-slot is redesigned into a PRM, which has the same stator and different rotor structure with IPM. Through finite element analysis(FEA) and equivalent circuit method, the PRM has higher salient ratio, higher efficiency at high speed, and lower iron loss compared with IPM.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 E
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• pp.1737-1739
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• 1997

We describe the characteristic of LVI test system and methods to detect the deformation of windings in the power transformers. As the front rise time of recurrent-surge generator pulse less than 1000ns and the peak value of pulse is about 500V, we have the good results of detecting winding deformation in the LVI test of transformer. And we discuss the application of LVI test method and the condition of RSG pulse through results of in one and three pole transformers under Lab. tests.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.110-112
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• 2004

The magnetization directions of a polar anisotropic ferrite-bonded magnet are analyzed by finite element method (FEM). The influence of the width of Sm-Co magnets for magnetic field generation is investigated. The surface flux densities of the polar anisotropic magnets are analyzed and compared according to the pole number and thickness of the magnets. And the electromotive force (EMF) values of brushless DC motors with the magnets are investigated.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.42-54
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• 2009

The wind load equation for the design of electric power facilities such as electrical pole in railroad is based on the maximum wind velocity without considering regional difference in wind velocities. Also, the use of a different equation to highspeed railroad and the possibility of higher wind speed due to climate change claims a new design equation. In this paper, a wind load equation based on wind speed measurement data to date, which is applicable to both conventional and highspeed railroad is proposed. The proposed equation considers the regional differences in wind speed for economic and effective design, and the possibility of higher wind speed due to climate change.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 A
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• pp.238-240
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• 1997

In two case, LPM driving by full step or microstep, we simulated the thrust force in LPM using finite element method and measured the force by experimental equipment. And We analyze the harmonics of trust force by Fast Fourier Transform. We proposed the method, which can reduced harmonic force by microstep driving.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.83-86
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• 2005

This paper proposed a hydraulic pump system which uses a variable SR drive and constant capacity pump. The base and maximum speed, torque are determined from displacement capacity of the pump and maximum pressure. The drive system is set to have a minimum power consumption having hydraulic preset pressure, which is operated within a maximum capacity and maximum preset pressure. This is achieved by controlling motor speed and power with feedback signal of pressure of the hydraulic pump. A 2.2kw, 12/8-pole SR motor and DSP based digital controller are designed and prototype drive system is manufactured. The proposed variable speed SR drive system is simulated and tested with experimental set-up. The test results show that the system has some good features such as high efficiency and high response characteristics.

• 전기의세계
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• 제14권1호
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• pp.35-39
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• 1965

Field problems are solved by a variety of methods. In the relatively small number of cases that are simiple enough, the mathematical attack may be the method of choice. But many field problems with irregular boundary condition must be handled by the use of the electrolitic tank analog, conducting paper or the fluid mapper analog for the purpose of effectiveness and convenience. The method of choice depends on the actual of the problems. There is no one best way to solve all problems. The following points have been described in this apepr, 1. Theoretical studies are made of the vector which is produced by leading the fluid flow vector by a right angle. 2. Curvilinear square method is described., 3. Determination on magnetic flux distribution and variation according to the magnitude of exciting currents.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.194-196
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• 1999

This paper verifies that DSPSRM having the rotor pole of "ㅓ" shape has a radial and axial flux distribution, and analyzes the flux density distribution of each direction using 3D FEM.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.3-5
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• 1999

The 4-pole LHSM was composed of the figure-of-eight shaped 3-phase armature windings, DC field windings, and the segmented secondary with the transverse bar track. Three dimensional model of LHSM provided the equivalent reluctance and PM model for 2D FEA. From these 2D FEA models, when the motor was fed by DC and 3-phase currents, the magnetic field were calculated and compared with the results of 3D FEA.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.214-216
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• 1999

This paper discussed an optimal designs of 2 pole fan motors in refrigerator using a Niching Algorithm. We applied a Niching method to multi-objective optimal design of air gap construct. This Niching genetic algorithm is called "Restricted Competition Selection"(RCS) that is suitable for real world problem such as shape or structural optimization of electromagnetic device. The finite element method being used for nonlinear numerical characteristic analysis is provided exact solution in the system. Through this process is reduced the cogging torque ripple in air gap.