• Title/Summary/Keyword: Iron Loss

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Calculation of Iron Loss under Rotational Magnetic Field Using Finite Element Method (회전 자계에 의한 철손의 유한요소 해석)

  • Lee, H.Y.;Park, G.S.;Hahn, S.Y.
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.147-149
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    • 1994
  • In designing high efficiency electrical machines, calculation of iron loss is very important. And it is reported that in the induction motor and in the T-joint of 3 phase transformer, there occurred rotational magnetic field and much iron loss is generated owing to this field. In this paper, rotational power loss in the electrical machine under rotational magnetic field is discussed. Until now, loss analysis is based on the magnetic properties under alternating field. And with this one dimensional magnetic propertis, it is difficult to express iron loss under rotational field. In this paper, we used two dimensional magnetic property data for the numerical calculation of rotational power loss. We used finite element method for calculation and the analysis model is two dimensional magnetic property measurement system. We used permeability tensor instead of scalar permeability to present two dimensional magnetic properties. And in this case, we cannot uniquely define energy functional because of the asymmetry of the permeability tensor, so Galerkin method is used for finite element analysis.

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Vector Control Scheme of Synchronous Reluctance Motor Considering Iron Loss (철손을 고려한 동기형 릴럭턴스 모터의 벡터제어)

  • 김길환;이중호;김정철;현동석
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.55-59
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    • 1997
  • In general, Vector control of synchronous reluctance motor(SynRM) is performed under the assumptions that all the parameters are constant and magnetizing flux saturation and iron loss effect can be negligible. Under these assumptions, however, torque nonlinear characteristic can be a possible performance deterioration when precision torque control is needed and operating speed is high. This paper proposes the method, in the Synchronous Reluctance Motor (SynRM), which select appropriate stator d,q-axis currents that the influence of iron core loss on the developed torque can be minimized, and shows that the proposed method is comparable to the algorithm which compensates the iron core loss effect.

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A study on Iron Loss Measurement In Electric Machines (데이터 분석 알고리즘을 이용한 철손 측정(2차원 B-H 관계))

  • Lee, Dong-Hyun;Hong, Sun-Ki
    • Proceedings of the KIEE Conference
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    • 2004.07d
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    • pp.2347-2349
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    • 2004
  • The iron loss in electric machines takes large part of machine losses and the reduction of iron loss brings the increase of the efficiency. In the rotating machines, however it is very difficult to calculate result because the measuring processes are very complex and laborious. As is well known, the relation between the flux density B and the magnetic field intensity H relation is not linear. For the iron loss, B and H must be measured and usually B becomes the reference wave(sine wave) and the following H is measured using H-coil. To make the B as sine wave, B is controlled by some devices. The error is controlled to become zero by the proposed algorithm which uses the bisection algorithm. The experiments are compared with the simulation results, and they show acceptable agreements.

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Analysis of Iron Loss in a Amorphous Transformer (아몰퍼스 변압기의 철손해석)

  • Im, D.H.;Kwon, B.I.;Yun, S.B.;Park, S.C.;Lee, J.H.
    • Proceedings of the KIEE Conference
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    • 1993.11a
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    • pp.79-81
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    • 1993
  • In this paper, the iron loss of a amorphous transformer is calculated by the specific iron loss curve, after calculating flux densities in core using magnetic equivalent circuit method and FEM. In iron loss analysis using FEM, lamination model of amorphous transformer is transformed into anisotropy model, and it is known that the result is almost equal compared with the result of analysis using magnetic equivalent circuit method.

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Harmonic Iron Analysis of Traction Motor in the High Speed Train with the Distributed Tractions (동력분산형 고속 전철용 견인전동기의 고조파 철손 해석)

  • Seo, Jang-Ho;Lim, Jae-Won;Jung, Won;Jeon, Ho-Chang;Kim, Min-Suk;Jung, Hyun-Kyo
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.162-168
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    • 2008
  • To predict efficiency of Interior Permanent Magnet Synchronous Motors(IPMSM) and to cope with the demagnetization risk of permanent magnets used in the IPMSM, accurate iron analysis of the IPMSM is very important at the motor design stage. In the analysis, we developed a new iron loss model of electrical machines for high-speed operation. The calculated iron loss was compared with the experimental data. It was clarified that the proposed method can estimate iron loss effectively at high-speed operation.

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Electromagnetic field analysis and performance characteristics of PMSM/G with Halbach magnetized array rotor (Halbach 자화 배열 회전자를 갖는 영구자석 동기 전동발전기의 전자기적 해석 및 성능 특성)

  • Jang, Seok-Myeong;You, Dae-Joon;Ko, Kyoung-Jin;Choi, Sang-Kyu
    • Proceedings of the KIEE Conference
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    • 2008.04c
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    • pp.86-88
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    • 2008
  • The rotational loss is one of the most important problems for the practical use of the high power Flywheel Energy Storage System (FESS). This rotational loss is divided as the mechanical loss by windage and bearing and iron loss by hysteresis loop and eddy current in the part of the magnetic field. So, In this paper, a double-sided PMSM/G without the iron loss is designed by analytical method of the magnetic field and estimation of the back-EMF constant represented as the design parameter. This design model consists of the double-sided PM rotor with Halbach magnetized any and coreless 3-phase winding stator. The results show that the double-sided PMSM/G without iron loss can be applicable to the high power FESS.

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Analytical Study Considering Both Core Loss Resistance and Magnetic Cross Saturation of Interior Permanent Magnet Synchronous Motors

  • Kim, Young-Kyoun
    • Journal of Magnetics
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    • v.17 no.4
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    • pp.280-284
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    • 2012
  • This paper presents a method for evaluating interior permanent magnet synchronous motor (IPMSM) performance over the entire operation region. Using a d-q axis equivalent circuit model consisting of motor parameters such as the permanent magnetic flux, copper resistance, core loss resistance, and d-q axis inductance, a conventional mathematical model of an IPMSM has been developed. It is well understood that in IPMSMs, magnetic operating conditions cause cross saturation and that the iron loss resistance - upon which core losses depend - changes according to the motor speed; for the sake of convenience, however, d-q axis machine models usually neglect the influence of magnetic cross saturation and assume that the iron loss resistance is constant. This paper proposes an analysis method based on considering a magnetic cross saturation and estimating a core loss resistance that changes with the operating conditions and speed. The proposed method is then verified by means of a comparison between the computed and the experimental results.

A study on the Reduction of the Stator iron loss on Permanent Magnet Synchronous Motor for Light Railway Transit Propulsion System (경량전철 추진용 영구자석 동기전동기의 고정자 철손 저감 연구)

  • Park, Chan-Bae;Lee, Hyung-Woo;Lee, Byung-Song
    • Journal of the Korean Society for Railway
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    • v.15 no.4
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    • pp.376-380
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    • 2012
  • A study on the iron-loss reduction of 110kW-class Interior Permanent Magnet Synchronous Motor (IPMSM) for Light Railway Transit (LRT) is conducted. In general, the iron loss of IPMSM depends on the characteristics of core material and non-oriented electrical steel is used as a core material of IPMSM. In order to reduce the iron-loss of IPMSM, both non-oriented electrical steel and grain oriented electrical steel are applied as core material. Iron loss of 110kW-class IPMSM can be reduced approximately 40% comparing to an existing IPMSM by applying grain oriented electrical steel to the stator teeth.

Fabrication and Magnetic Properties of A New Fe-based Amorphous Compound Powder Cores

  • Xiangyue, Wang;Feng, Guo;Caowei, Lu;Zhichao, Lu;Deren, Li;Shaoxiong, Zhou
    • Journal of Magnetics
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    • v.16 no.3
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    • pp.318-321
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    • 2011
  • A new Fe-based amorphous compound powder was prepared from Fe-Si-B amorphous powder by crushing amorphous ribbons as the first magnetic component and Fe-Cr-Mo metallic glassy powder by water atomization as the second magnetic component. Subsequently by adding organic and inorganic binders to the compound powder and cold pressing, the new Fe-based amorphous compound powder cores were fabricated. This new Fe-based amorphous compound powder cores combine the superior DC-Bias properties and the excellent core loss. The core loss of 500 kW/$m^3$ at $B_m$ = 0.1T and f = 100 kHz was obtained When the mass ratio of FeSiB/FeCrMo equals 3:2, and meanwhile the DC-bias properties of the new Fe-based amorphous compound powder cores just decreased by 10% compared with that of the FeSiB powder cores. In addition, with the increasing of the content of the FeCrMo metallic glassy powder, the core loss tends to decrease.

Iron Loss Analysis of Transverse Flux Linear Motor using Solid type Yoke (Solid type 요크를 사용하는 횡자속 전동기의 철손해석)

  • Lee Ji-Young;Hong Jung-Pyo;Chang Jung-Hwan;Kang Do-Hyun
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1055-1057
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    • 2004
  • This paper deals with a qualitative analysis of iron loss in Transverse Flux Linear Motor (TFLM). 3D equivalent magnetic circuit network method (EMCNM) is used as an analytical method to get flux density of each element. The total core loss is calculated with the magnetic flux density and core loss curves of an optional material. The results of iron loss analysis can be used as a criterion to decide the manufactural shape such as lamination or solid type core, skew position, etc.

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