• 제목/요약/키워드: eddy-current loss

검색결과 218건 처리시간 0.034초

Influence of Different Frequency Harmonic Generated by Rectifier on High-speed Permanent Magnet Generator

  • Qiu, Hongbo;Wei, Yanqi;Yang, Cunxiang;Fan, Xiaobin
    • Journal of Electrical Engineering and Technology
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    • 제13권5호
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    • pp.1956-1964
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    • 2018
  • Since the stator winding of High-Speed Permanent Magnet Generator (HSPMG) has few winding turns and low inductance value, it is more prone to be influenced by harmonic current. Moreover, the operation efficiency and the torque stability of HSPMG will be greatly influenced by harmonic current. Taking a 117 kW, 60 000 rpm HSPMG as an example, in order to analyze the effects of harmonic current on HSPMG in this paper, the 2-D finite element electromagnetic field model of the generator was established and the correctness of the model was verified by testing the generator prototype. Based on the model, the losses and torque of the generator under different frequency harmonic current were studied. The change rules of the losses and torque were found out. Based on the analysis of the influence of the harmonic phase angle on torque ripple, it is found that the torque ripple could be weakened through changing the harmonic phase angle. Through the analysis of eddy current density in rotor, the change mechanism of the rotor eddy current loss was revealed. These conclusions can contribute to reduce harmonic loss, prevent demagnetization fault and optimize torque ripple of HSPMG used in distributed power supply system.

Permanent Magnet Eddy Current Analysis of SPM Synchronous Motors according to Magnet Shapes

  • Lee, Sun-Kwon;Kang, Gyu-Hong;Kim, Byoung-Woo;Hur, Jin
    • Journal of international Conference on Electrical Machines and Systems
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    • 제3권4호
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    • pp.398-402
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    • 2014
  • This paper presents the comparison study of permanent magnet (PM) eddy current of concentrated winding type surface permanent magnet synchronous motor (SPMSM) with different rare-earth magnet shapes. The fractional slot winding having 10 poles and 12 slots is studied. The PM eddy current is analyzed to compare for each shape by 2 dimensional (2D) finite element analysis (FEA). The eddy current and their loss of particular position of PM as well as their distributions are displayed for each model. The effect of partly enlarged air-gap made by PM shape to PM eddy current is compared.

Nano-scale Inter-lamellar Structure of Metal Powder Composites for High Performance Power Inductor and Motor Applications

  • Kim, Hakkwan;An, Sung Yong
    • Journal of Magnetics
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    • 제20권2호
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    • pp.138-147
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    • 2015
  • The unique nano-scale inter-lamellar microstructure and unparalleled heat treatment process give our developed metal powder composite its outstanding magnetic property for power inductor & motor applications. Compared to the conventional polycrystalline Fe or amorphous Fe-Cr-Si-B alloys, our unique designed inter-lamellar microstructure strongly decreases the intra-particle eddy current loss at high frequencies by blocking the mutual eddy currents. The combination of optimum permeability, magnetic flux and extremely low core loss makes this powder composite suitable for high frequency applications well above 10 MHz. Moreover, it can be also possible to SMC core for high speed motor applications in order to increase the motor efficiency by decreasing the core loss.

Iron Loss Analysis Considering Excitation Conditions Under Alternating Magnetic Fields

  • Hong, Sun-Ki;Koh, Chang-Seop
    • 조명전기설비학회논문지
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    • 제24권3호
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    • pp.33-38
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    • 2010
  • In this paper, the nature of iron loss in electrical steel during alternating field excitation is investigated more precisely. The exact definition of AC iron loss is cleared by accurately measuring the iron loss for conditions of both the sinusoidal magnetic field and sinusoidal magnetic flux density. The results of this approach to iron loss calculations in electrical steel are compared to experimentally-measured losses. In addition, an inverse hysteresis model considering eddy current loss was developed to analyze the iron loss when the input is the voltage source. With this model, the inrush current in the inductor or transformer as well as the iron loss can be calculated.

와전류 손실을 적용한 금형으로 제조된 초고압 변압기의 프레스보드의 절연 특성 연구 (A Study on the Insulating Properties of Pressboard for High Voltage Transformer Applied the Mold of Eddy Current Loss)

  • 서왕벽
    • 한국전기전자재료학회논문지
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    • 제28권8호
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    • pp.508-512
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    • 2015
  • Some insulating materials are tested and analyzed with variables to obtain the reliable pressboard which is located to core and coil of high voltage transformer. The high voltage transformer is used in electrical power system and operating reliability. Optimization possibility of pressboard shape including electrical insulation performance could be achieved by analysis simulation. Using insulating pressboard, which is made by mold applied eddy current loss, it could be measured the influences of moisture content for electrical properties. As a result, it is to contribute to improve the performance and ensure the reliability of the pressboard by investigating electrical strength according to the variation oil temperature. In addition pressboard thickness is important design factor to ensure electrical strength in high voltage transformer.

Axi-periodic Analysis를 이용한 대형 터보 발전기 단부 Flux Shield의 Eddy Current Loss 산정 (Eddy current loss calculation of flux shield in the large turbo generator using axi-periodic analysis)

  • 권순오;이정종;홍정표;남혁
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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    • pp.987-989
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    • 2005
  • Axi-periodic analysis using magnetic vector potential is formulated in time harmonic field and applied to the field analysis for the end region of large turbo generator in this paper. By using axi-periodic analysis, the effect of flux shield, one of the structure placed in the end region of large turbo generator to prevent stator end from thermal damage, is studied, and eddy current loss in the flux shield is estimated for operation conditions. 3D FEA is used for the verification of presented analysis method. Because 3D flux distribution can be calculated with 2D modeling, magnetic field showing 3D distribution can be effectively calculated by axi-periodic analysis comparing with 3D FEA.

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풍력터빈 적용을 위한 PMSG용 영구자석의 와전류손실에 관한 연구 (A Study on the Eddy Current Loss of the Permanent Magnet for PMSG for the Wind Turbine Application)

  • 최만수;문채주;쑨루이;장영학;박태식;정문선;곽승훈
    • 한국태양에너지학회 논문집
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    • 제34권2호
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    • pp.8-15
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    • 2014
  • The objective of this paper is to suggest a design topology of permanent magnet synchronous generator with 2,000kW capacities for wind turbine. The suggested topology is to provide 3 split magnet PMSG instead of single magnet, and performed an analysis of eddy current loss and iron loss for suggested type using ansoft maxwell commercial program. The simulation results of suggested magnet type show there duction of eddy current loss as 13.87kW with loadless conditions and23.48kW with rated conditions, but iron loss for rotor yoke show the in creasing trend as2.2kW with loadless conditions and 0.2kW with rated conditions. The suggested 3 split maget type is to identified as more useful for 2,000kW PMSG.

유한요소해석을 이용한 영구자석의 와전류 손실 해석 (Eddy current loss analysis of permanent magnet using Finite Element Method)

  • 이정종;정재우;이상호;권순오;홍정표
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2008년도 제39회 하계학술대회
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    • pp.794-795
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    • 2008
  • In this paper, eddy current compensation method of 2D finite element method(FEM) is studied compared with 3D FEM. The result of eddy current loss of permeant magnet is different from 3D FEM result because current loop of the inside of permanent magnet can not expressed by 2D FEM. In order to reduce the error between 2D and 3D FEM, permanent magnet conductivity is compensated considering current loop of magnet shape according to length and width.

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착탈형 와류센서를 이용한 ACSR전선의 아연손실량 검출 (Zinc Loss Detection in ACSR Power Lines using the Removable Type of Eddy Current Sensor)

  • 장태인;조성배;강지원;강연욱;양병모
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 하계학술대회 논문집 C
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    • pp.1963-1965
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    • 2000
  • This paper deals with a problem of detecting the inner corrosion of the ACSR(Aluminum Conductor Steel Reinforced) power lines using a detector which consists of an ECT(Eddy Current Test) sensor, a constant current service, a signal processing unit, and a RF transmitter/receiver unit. The detector runs on the ACSR transmission line and inspects the corrosion of the conductor using the technic of the nondestructive eddy current test. The experimental result shows this detector can efficiently find the zinc loss in ACSR power lines.

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