• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제55권4호
• /
• pp.203-208
• /
• 2006

This paper presents characteristics of SynRM(Synchronous Reluctance Motor) that is compared with a high speed induction motor. SynRM is much suitable for high speed electric machines because of structural robustness. There are many kinds of SynRM according to the shape of rotors. Particularly, axially laminated anisotropic (ALA) rotor is suitable for high speed instruments. Characteristics of SynRM with ALA rotor is obtained from a governing voltage and torque equation mainly composed of d-axis and q-axis inductance that will be identified with finite element method.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2008년도 제39회 하계학술대회
• /
• pp.440-441
• /
• 2008

본 논문은 현수형 송전 케이블과 장력발생 교류 서보전동기의 모델을 나타내고 송전케이블의 이도를 일정히 유지하기 위한 장력을 계산하는 알고리즘을 나타내었다. 현수형 송전선 특성에 기초하여 로드셀을 이용한 장력측정에 의해 송전선 가설 시스템의 구성법이 제안되었다. 가설시스템은 장력 발생장치에 교류서보 전동기를 이용하고 케이블의 장력계측 장치는 하중변환기(load cell)를 사용한다.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2010년도 하계학술대회 논문집
• /
• pp.560-562
• /
• 2010

본 연구의 목적은 농형 유도 발전기를 이용한 가변속 독립 운전형 풍력 발전 시스템의 최대 전력 추종 제어기법을 제안한다. 제안된 기법은 M-G 세트로 구성하여 풍력터빈의 역할을 하는 터빈 시뮬레이터를 직류전동기의 토크제어를 이용하여 구현하였다. 농형 유도발전기는 벡터제어를 기본으로 간접 벡터제어를 위하여 유도발전기를 좌표 변환하여 모델링하고 이것을 기초로 제어알고리즘을 도출하였다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제50권12호
• /
• pp.592-600
• /
• 2001

This Paper presents the transient analysis of the single-phase line-start permanent magnet synchronous motor. To analyse the starting characteristics, the dynamic equation which is combined electric dynamic equations with mechanical dynamic equation is used. The electric dynamics are derived from the d-q axis voltages of stator and rotor respectively. Especially, symmetrical components transformation is used to consider unbalanced magnetic field which is produced by single-phase input. Non-linear d-q axis inductances according to current amplitude and current phase angle are calculated by Finite Element Method and applied to lumped parameter circuit. The analysis methods are validated by comparing simulated and experimental results.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제55권2호
• /
• pp.76-82
• /
• 2006

This paper investigates the magnetic field behavior and its iron losses in the stator core using electrical steels. The analysis model is a brushless motor with the permanent magnet. The elliptical rotating and alternating flux distributions with non-sinusoidal waveform are obtained by Finite Element Method and then their harmonic components are extracted. Based on these results, the local iron losses in the stator core caused by the harmonic flux are calculated. And then this paper explains the relation between flux waveform and iron loss produced in each part of the stator core. Furthermore, the iron loss at no load condition is measured and compared with the analysis results.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제49권12호
• /
• pp.789-796
• /
• 2000

This paper deals with magnetic field and characteristic analysis for ring type slotless synchronous motors by using analytical method. Since magnetic air-gap in the slotless motors is much larger than mechanical air-gap, it is necessary to analyze the magnetic flux distribution at the whole magnetic airgap region. therefore, this paper analyzes the duplicated magnetic field derived by both Permanent Magnet(PM) and armature current and estimates the back electromotive force and torque characteristic by subdividing the conductor region. The analysis results are verified by comparing with Finite Element Analysis(FEA) results.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제52권10호
• /
• pp.501-506
• /
• 2003

A Superconducting Rotary Machine (SRM) is characterized by an air-cored machine with its rotor iron and stator iron teeth removed. For this reason, the SRM is featured by 3D magnetic flux distribution, which decreases in the direction of axis. Therefore, 3D magnetic field analysis method is required to know about characteristic of magnetic field distribution of SRM. In this paper, 3D flux distribution of SRM is calculated by analytical method. The magnetic field distribution of the field coils is calculated by Biot-Savart equation. The magnetic core is represented by magnetic surface polarities. This paper describes the combined use of above methods for the total field computation, and compares results of analytical method and 3D FEM(Finite Element Method).

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제50권3호
• /
• pp.115-121
• /
• 2001

This paper deals with the electrical insulation design of a gas insulated power transformer based on extra turns method satisfying the impulse test performed in the worst condition. The calculation of electrical strength in insulation structure was done by 2D finite element method. The gas insulated power transformer was manufactured by selecting the optimum arrangement among design results. the validity of the design result is verified by the impulse test of manufactured machine.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제48권4호
• /
• pp.145-151
• /
• 1999

This paper presents the characteristic analysis method of PMLSM based on the Space Harmonic Analysis method considering the effect of stator slots. The magnetic field for unslotted primary can be easily calculated by the conventional space harmonic analysis method and the resultant magnetic field including slot effect is obtained using the concept of the virtual Equivalent Magnetizing Current(EMC) on primary core. And the influence of space harmonics in airgap flux density and static thrust due to slots is evaluated. In this paper, the results of the analytical method are compared with not only the experimental ones but ones of FEM to verify the validity of the proposed method.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2002년도 춘계학술대회 논문집 초전도 자성체
• /
• pp.83-87
• /
• 2002

In order to improve the capability of magnetic circuit, magnetic materials are used for all kinds of electromagnetic energy-conversion devices. This paper presents the analysis method considering magnetic properties of the magnetic material and analyzes that the effects of magnetic materials. In addition, it is described that the requirements of magnetic materials for the improvement of electric machines. Several application examples using a metal powder in electromagnetic energy conversion devices is introduced.