FEM Computation of Magnetic Field and Iron Loss in Laminated Iron Core Using Homogenization Method

2006 ◽  
Author(s):  
H. Kaimori ◽  
A. Kameari ◽  
K. Fujiwara
Keyword(s):  
Magnetic Field ◽  
Homogenization Method ◽  
Iron Loss ◽  
Iron Core

FEM Computation of Magnetic Field and Iron Loss in Laminated Iron Core Using Homogenization Method

2007 ◽  
Vol 43 (4) ◽  
pp. 1405-1408 ◽  
Author(s):  
Hiroyuki Kaimori ◽  
Akihisa Kameari ◽  
Koji Fujiwara
Keyword(s):  
Magnetic Field ◽  
Homogenization Method ◽  
Iron Loss ◽  
Iron Core

scholarly journals Iron Loss Analysis of a Concentrated Winding Type Interior Permanent Magnet Synchronous Motor with Single and Dual Layer Magnet Shape

Machines ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 74
Author(s):  
Chan-Ho Baek ◽  
Hyo-Seob Shin ◽  
Jang-Young Choi
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Homogenization Method ◽  
Iron Loss ◽  
Frequency Separation ◽  
Permanent Magnet Synchronous Motors ◽  
Loss Analysis ◽  
Iron Losses ◽  
Interior Permanent Magnet ◽  
Rotor Type

In this study, the iron losses of high flux density concentrated winding-type interior permanent magnet synchronous motors for three different magnet shapes (single-V, single-flat, and dual-delta) and rotor structures are analyzed and compared. Iron loss is analyzed using the classical Steinmetz equation (CSE) based on the frequency separation approach using the iron loss material table, and each rotor type is compared. In addition, to validate the hysteresis loss for each rotor type, two additional analyses are performed. In the methods considered, the number of minor loops is counted, and the area is calculated based on DC bias. The eddy current loss is compared using two approaches: CSE base frequency separation and the homogenization method considering the skin effect. This study primarily focuses on the comparison of relative iron losses based on different rotor topologies instead of absolute comparisons.

Iron loss measurement device under rotating magnetic field

1999 ◽  
Vol 146 (1) ◽  
pp. 35-39 ◽  
Author(s):  
R. Aouli ◽  
M. Akroune ◽  
A. Mouillet ◽  
M.A. Dami
Keyword(s):  
Magnetic Field ◽  
Rotating Magnetic Field ◽  
Iron Loss ◽  
Measurement Device ◽  
Loss Measurement

Earth's Solid Iron Core May Skew Its Magnetic Field

Science ◽  
1995 ◽  
Vol 267 (5206) ◽  
pp. 1910-1911
Author(s):  
R. A. Kerr
Keyword(s):  
Magnetic Field ◽  
Iron Core ◽  
Solid Iron

Proposal of Core Structures for Iron Loss and Noise Reduction of Three-Phase Reactor with Anisotropic Iron Core

2020 ◽  
pp. 1-1
Author(s):  
Yanhui Gao ◽  
Shuhei Ichimaru ◽  
Toshihisa Miyabe ◽  
Hiroshi Dozono ◽  
Kazuhiro Muramatsu ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Iron Loss ◽  
Iron Core ◽  
Three Phase

scholarly journals Prediction of Eddy Current Losses in Cooling Tubes of Direct Cooled Windings in Electric Machines

Mathematics ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 1096 ◽  
Author(s):  
Mohamed Nabil Fathy Ibrahim ◽  
Peter Sergeant
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Eddy Current ◽  
Electric Machines ◽  
Iron Core ◽  
Commercial Software ◽  
Eddy Current Losses ◽  
Switched Reluctance ◽  
Element Simulation ◽  
Core Losses

The direct coil cooling method is one of the existing cooling techniques for electric machines with concentrated windings, in which cooling tubes of conductive material are inserted between the windings. In such cases, eddy current losses are induced in those cooling tubes because of the time variant magnetic field. To compute the cooling tubes losses, either a transient finite element simulation (mostly based on commercial software), or a full analytical method, which is more complex to be constructed, is required. Instead, this paper proposes a simple and an accurate combined semi-analytical-finite element method to calculate the losses of electric machines having cooling tubes. The 2D magnetostatic solution of the magnetic field is obtained e.g., using the free package “FEMM”. Then, the eddy current losses in the tubes are computed using simple analytical equations. In addition, the iron core losses could be obtained. In order to validate the proposed method, two cases are investigated. In Case 1, a six-toothed stator of a switched reluctance machine (SRM), without rotor, is employed in which six cooling tubes are used while in Case 2 a complete rotating SRM is studied. The proposed method is validated by a 2D transient simulation in the commercial software “ANSYS Maxwell” and also by experimental measurements. Evidently, the proposed method is simple and fast to be constructed and it is almost free of cost.

Finite-element analysis of turbine generator using homogenization method taking account of magnetic anisotropy

2019 ◽  
Vol 38 (5) ◽  
pp. 1614-1626
Author(s):  
Ryoko Minehisa ◽  
Yasuhito Takahashi ◽  
Koji Fujiwara ◽  
Norio Takahashi ◽  
Masafumi Fujita ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Homogenization Method ◽  
Field Analysis ◽  
Iron Core ◽  
Saturation Curve ◽  
Turbine Generator ◽  
Element Analysis ◽  
Content Type ◽  
Space Factor ◽  
Magnetic Field Analysis

Purpose This paper aims to propose a homogenization method considering magnetic anisotropy for a magnetic field analysis of a turbine generator. To verify the validity of the proposed method, the effects of magnetic anisotropy and a space factor on a no-load saturation curve and no-load iron loss of the turbine generator are discussed. Design/methodology/approach The proposed method was derived from the combination of the homogenization of microscopic fields in a laminated iron core with the modelling of two-dimensional magnetic properties based on free energy. To verify the validity, the proposed method was applied to a finite-element analysis of a simple ring core model. Finally, a no-load saturation curve and iron loss of the turbine generator was investigated by using the proposed method. Findings The computational accuracy of the homogenization method considering magnetic anisotropy is almost the same as that of the detailed modelling of the laminated structure in the magnetic field analysis of the laminated iron core. Furthermore, it is clarified that magnetic anisotropy does not have a large influence on the no-load saturation curve of the turbine generator because of the large air gap. On the other hand, the space factor affects the shape of the no-load saturation curve. Originality/value This paper verifies the validity of the homogenization method considering magnetic anisotropy method and elucidates the effects of magnetic anisotropy and a space factor on no-load characteristics of the turbine generator.

scholarly journals Magnetorotational supernovae with different equations of state

2011 ◽  
Vol 7 (S279) ◽  
pp. 357-358
Author(s):  
Sergey G. Moiseenko ◽  
Gennady S. Bisnovatyi-Kogan
Keyword(s):  
Magnetic Field ◽  
Shock Wave ◽  
Angular Momentum ◽  
Differential Rotation ◽  
Equations Of State ◽  
Supernova Explosion ◽  
Explosion Energy ◽  
Iron Core ◽  
Wave Forms ◽  
The Magnetic Field

AbstractWe present results of the simulation of a magneto-rotational supernova explosion. We show that, due to the differential rotation of the collapsing iron core, the magnetic field increases with time. The magnetic field transfers angular momentum and a MHD shock wave forms. This shock wave produces the supernova explosion. The explosion energy computed in our simulations is 0.5-2.5 ċ 1051erg. We used two different equations of state for the simulations. The results are rather similar.

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