• 한국화재소방학회논문지
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• 제21권4호
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• pp.59-64
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• 2007

본 논문은 전동기에 발생하는 화재에 대한 연구로서, 일반가전제품에 사용되고 있는 단상유도전동기에 과부하 및 외부화염을 가하여 그 변형 및 파손상태를 비교 분석하였다. 실험은 전동기의 구속을 통한 과부하 시험과 외부에서 화염을 가하는 실험으로 진행하였으며, 외부화염 시험의 경우 전압을 인가한 경우와 인가하지 않은 경우로 구분하였다. 실험결과 구속을 통한 과부하 시험의 경우 권선부분에서 층간 단락흔을 관찰할 수 있었고, 권선부분의 조직에서는 과부하에 의해 변형된 전선의 특징인 나무줄기 형상의 수지상 조직이 나타났다. 전압을 인가한 상태에서 외부화염을 가한 경우 고정자 권선부분의 코일이 원형을 유지하고 있는 것을 확인할 수 있었고, 권선주변의 색이 붉게 변색된 것을 볼 수 있었다. 전압을 인가하지 않고 외부화염을 가한 경우 고정자 권선부분의 코일이 원형에서 많이 변형된 것을 관찰할 수 있었고, 권선 주변의 색은 전압을 인가한 경우와 마찬가지로 붉게 변색된 것을 확인할 수 있었다.

• Journal of Electrical Engineering and Technology
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• 제9권4호
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• pp.1309-1314
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• 2014

The measurement of stator core loss for an induction motor at each manufacturing process is carried out in this paper. Iron loss in the stator core of induction motor changes after each manufacturing process due to the mechanical stress, which can cause the deterioration of the magnetic performances. This paper proposes a new iron loss measuring system of the stator core in an induction motor, which can be applied to the case when the distribution of magnetic flux density is not uniform along the magnetic flux path. In the system, the iron loss is calculated based on the induced voltage of the B-search coil and exciting current.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 A
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• pp.278-280
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• 1998

A voice-coil-type LOA consists of the NdFeB permanent magnets with high specific energy as the stator, a coil-wrapped nonmagnetic hollow rectangular structure, and an iron core as a pathway for magnetic flux. When applying a voice-coil-type LOA to the control system, we have to obtain the control parameters and circuit parameters, such as mass, coil inductance, coil resistance, thrust voltage & stroke, frequency & stroke and so on. Therefore, these parameter were determined from the analytical and experimental method.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.104-106
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• 2001

In this paper, it is object of design of high efficiency slotless BLDC motor using film coil. Slotless BLDC motor is able to have high efficiency property and low cogging torque, due to magnetization of stator core have constant contribution by slotless core. But it is difficult to make coil winding of slotless BLDC motor. So we make amateur of slotless BLDC motor using film coil. Film coil is fabricated by drilling, electro-plating and etching of copper/insulator/copper plate. In this paper, after design of slotless BLDC motor for moving axial blower, it is fabricated by NdFeB permanent magnet type rotor and film coil.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.663-665
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• 2002

Moving flat core type LOA consists of iron flat core as a mover and electric magnet as a stator and operated by electromagnetic force between mover and stator. First, this paper describes the voltage equation of coil and the mechanical equation of motion. Secondly, the dynamic simulation algorithm is proposed, and system control constant-inductance, resistance-were carried by exciting coil. Finally, we turned out the driving system and the dynamic characteristics of current, voltage and displacement is confirmed by experiment.

• 전기학회논문지
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• 제63권4호
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• pp.469-475
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• 2014

This paper deals with the characteristics evaluations of PM magnetization using stator coil in a Post-Assembly Line Start Permanent Magnet Motor (LSPMM) using a coupled Finite Element Method (FEM) and Preisach modeling, which is presented to analyze the magnetic characteristics of permanent magnets. The focus of this paper is the characteristics analysis relative to magnetizing direction and quantity of permanent magnets due to the eddy current occurring in the rotor bar during magnetization of Nd-Fe-B.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.51-54
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• 1991

The effect of inductance for optimal design of Hybrid permanent magnet step motor is presented on this paper. A pull-out torque of Hybrid permanent magnet step motor is measured and calculated by varying stator coil inductances, and power consumption of the step motor also is calculated and compared to the measured value. The relation of developed torque to parer consumption by the changing of magnetomotive force magnitude in a rotor permanent magnet is studied, which is the essence of the step motor design.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.266-271
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• 2003

The numerical study was carried out to effectively cool Induction motor applied to a washing machine. The outer rotor made of steel periodically spins up and down. The stator consists of the thin layered iron plates and copper coil. The effective cooling system is necessary to solve the reliability problem caused by the electric losses at the coil and the iron plate. Because the heat transfer rate of the natural convection in partially open space is generally low, thus it is necessary to enhance the heat transfer using rotating perforated plate. The flow phenomena around the motor are very complex due to the motor geometry and the outer rotor motion. The mixed convection takes place due to the slow rotation speed. The three dimensional flow simulation was performed using rotating reference frame technique and Boussinesq approximation but the radiation effect was neglected. It was found that the angle and direction of the cooling blades play an important role in the stator temperature.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.132-134
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• 2001

In this paper, by designning the width of the stator coil, double sided excitation LDM with multi-separated winding which is possible to obtain the constant thrust force is proposed. Using Maxwell 2D, Empulse, we were proved the characteristic analysis of LDM accoding to ratio magnet width venus coil width of LDM. Though designning for double sided excitation LDM with multi-separated winding, we could be achieved the constant thrust and rapidly time responses within the operating region.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.893-894
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• 2006

This paper presents a design and analysis solutions for the general class and control parameter estimation of slotted iron-cored Permanent Magnet Linear Synchronous Motor with Halbach magnetization stator and 3-phase winding mover. In our design and analysis, stator consisting of permanent magnets and slotted iron-cored coil mover are treated in a uniform way via magnetic vector potential. For one such motor structure, we give analytical formulas for its magnetic field, back electromotive force and trust force. Moreover, the detent force are calculated by the relative permeance function. In good agreement with the estimated values from the analyses, the experimental results and Finite Element Method (FEM) confirm the validity of the design and analysis framework.