• 제목/요약/키워드: Core losses

검색결과 218건 처리시간 0.022초

스위치드 릴럭턴스 전동기의 권선 방식과 구동 방식에 따른 철손 비료 (A Comparison of Core Losses according to Winding Methods and Switching Sequence in Switched Reluctance Motor)

  • 이지영;이병국;손도;홍정표;허진
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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    • pp.1104-1107
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    • 2005
  • This paper presents a comparison of core losses for the four cases of Switched Reluctance Motors (SRM) with different winding method and switching sequence. With concentrated winding SRM, two kinds of switching sequence are considered for one-phase exciting and two-phase simultaneously exciting driving. With both distributed winding and toroidal winding, two-phase exciting driving is considered. The ratio of calculated core losses to input power is able to be used a guide or reference for deciding the winding method and switching sequence of in the initial design stage of SRM.

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전동/발전기 코어에 의한 초전도 플라이휠 에너지 저장장치의 회전손실 특성 평가 (Rotational loss assessment of flywheel energy storage system by Motor/Generator core)

  • 이정필;한영희;정세용;한상철;정년호;성태현
    • 전기학회논문지
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    • 제56권10호
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    • pp.1775-1781
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    • 2007
  • In this paper, the rotational loss of the superconductor flywheel energy storage system (SFES) by motor/generator stator core was assessed. To do this, the vertical axial type SFES with journal type superconductor bearing was manufactured. To quantitatively assess the rotational loss by the stator core, the rotational losses by superconductor bearing and the degree of a vacuum were measured. In case of variation of the inner radius and outer radius of the stator core, the rotational losses were measured. From the experimental results, It is confirmed that the rotational loss can be reduced by means of the optimal stator core design.

회전속도를 고려한 영구자석형 풍력발전기의 철손 해석 (Core loss Analysis of Permanent Magnet Generator Considering the operating Speed for Wind Power Application)

  • 장석명;고경진;최장영;이성호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.115-117
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    • 2007
  • Core loss form a larger proportion of the total losses. This paper deals with the analysis on the core loss in PM generator considering the operating speed for wind power application. Using the data information from a manufacturer and nonlinear curve fitting, this paper investigates the magnetic behavior and its core losses in the stator core using the electrical steels.

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부하반환법에 의한 20KVA 비정질 변압기의 경년열화 연구 (Aging Test of 20kVA Amorphous Core Transformer by Loading Back Method)

  • 민복기;송재성;정영호;임정재
    • 대한전기학회논문지
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    • 제43권2호
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    • pp.278-285
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    • 1994
  • Aging test was done by loading back method for 20kVA amorphous core transformers manufactured by Hyosung Industries Co. and korea Electric Power Corporation. Iron losses, copper losses and insulation oil temperatures of the transfromers was measured for all the testing period. Expected life of amorphous core transformers on the basis of the degradation of the insulators was 46 years at 100% load, and 2.4 years at 130% load. Average temperature rising of transformer oil of amorphous core transformers was higher than that of silicon steel core transformers. Hence lowering the oil temperature by optimized design is needed for improving the expected life of the amorphous transformers.

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Stator Core with Slits in Transverse Flux Rotary Machine to Reduce Eddy Current Loss

  • Lee, Ji-Young;Koo, Dae-Hyun;Kang, Do-Hyun;Hong, Jung-Pyo
    • Journal of Magnetics
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    • 제17권1호
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    • pp.51-55
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    • 2012
  • This paper presents an eddy current loss analysis for a transverse flux rotary machine (TFRM) with laminated stator cores, which consist of inner and outer cores whose laminated directions are perpendicular to each other. Although the TFRM is laminated to reduce eddy current losses, it still exhibits rapidly increasing core losses as the frequency increases. To solve this problem, slits are introduced to the stator outer core. 3-dimensional finite element analysis (3D FEA) based on the T-${\Omega}$ formulation is used to solve the eddy-current problem for a various numbers of slits in the nonlinear lamination core. The effects of the slits are confirmed using experiment data and 3D FEA results.

축방향 자속형 전동기에서 연자성복합체 코어와 적층 전기강판 코어의 철손 비교 (Iron Loss Comparison between Soft Magnetic Composite Core and Laminated Steel Core in Axial Flux Machine)

  • 이민혁;남광희
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2015년도 추계학술대회 논문집
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    • pp.217-218
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    • 2015
  • Two axial flux permanent magnet (AFPM) machines using soft magnetic composite (SMC) and lamination steel are studied. Generally stator cores of AFPM machines are manufactured using SMC because AFPM machines need 3 dimensional core structures. However, SMC cores have very disadvantages in magnetic properties. Especially permeability value is much lower than that of lamination steel, so magnetic field density is also lower. In terms of core losses, SMC cores have much larger loss values than lamination steel cores because SMC core can't be laminated. In this study, AFPM machine was designed using laminated steel, and iron losses in two machines using SMC and laminated steel were studied. Simulations were carried out by a commercial 3-D FEM tool.

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Concentric Core Fiber Design for Optical Fiber Communication

  • Nadeem, Iram;Choi, Dong-You
    • Journal of information and communication convergence engineering
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    • 제14권3호
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    • pp.163-170
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    • 2016
  • Because of rapid technological advancements, increased data rate support has become the key criterion for future communication medium selection. Multimode optical fibers and multicore optical fibers are well matched to high data rate throughput requirements because of their tendency to support multiple modes through one core at a time, which results in higher data rates. Using the numerical mode solver OptiFiber, we have designed a concentric core fiber by investigating certain design parameters, namely core diameter (µm), wavelength (nm), and refractive index profile, and as a result, the number of channels, material losses, bending losses, polarization mode dispersion, and the effective nonlinear refractive index have been determined. Space division multiplexing is a promising future technology that uses few-mode fibers in parallel to form a multicore fiber. The experimental tests are conducted using the standard second window wavelength of 1,550 nm and simulated results are presented.

철계비정질합금의 고주파 자기특성 연구 (A Study on the Magnetic Properties of Fe-base Amorphous Alloys in High Frequency)

  • 송재성;김기욱;정순종
    • 대한전기학회논문지
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    • 제41권4호
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    • pp.379-384
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    • 1992
  • The Fe-base amorphous ribbons with 15mm width and about 20x10S0-6Tm thickness, (FeS179-xTCrS1xT)BS116TSiS15T and (FeS181-xTMnS1xT) BS112TSiS17T (x:0-6), were prepared melt spinner. The thickness of the ribbons followed by PFC (Planar Flow Casting). The initial permeability and total core losses were measured as a function of additive elements (Cr, Mn) and annealing conditions in high frequency for the purpose of using these materials as a core of magnetic amplifier and switched mode power supplies. The initial permeabilities were enhanced and core losses were decreased by non-magnetic field annealing in proper conditions. The lowest core loss in 0.2T/10kHz was measured at 3% Cr addition amorphous ribbon, and the loss was 5.6W/kg. The permeability of the ribbon at 10kHz was about 9000.

Comparative Study of Stator Core Composition in Transverse Flux Rotary Machine

  • Lee, Ji-Young;Moon, Seung-Ryul;Koo, Dae-Hyun;Kang, Do-Hyun;Lee, Geun-Ho;Hong, Jung-Pyo
    • Journal of Electrical Engineering and Technology
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    • 제6권3호
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    • pp.350-355
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    • 2011
  • This paper deals with the comparison of magnetic characteristics in transverse flux rotary machine according to different stator core composition with the same rotor. Three different stator designs are considered in the analysis according to the material composition of inner and outer stator cores. Electromotive force (EMF), inductance, torque, and core losses are calculated by threedimensional finite element analysis. Calculated and measured results of back-EMF according to the analysis models in dependency on speed are presented.

영구자석형 모터의 고정자 철심에서 자계의 거동 및 철손 분석 (Analysis of Magnetic Field Behavior and Iron Loss in Stator Core of Permanent Magnet Type Motor)

  • 하경호;차상윤;김재관;홍정표
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제55권2호
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    • pp.76-82
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    • 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.