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Zhang J.,Baoding Tianwei Group Co. | Zhang J.,North China Electrical Power University | Li L.,North China Electrical Power University | Liu L.,Baoding Tianwei Group Co. | And 3 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2013

The measurement and 3D finite element analysis of the iron loss, interlinkage flux inside the laminated silicon steel sheets and the magnetic flux densities at the specified positions are carried out based on a verifying silicon steel sheet model. The modeling results show that the leakage flux vertically through the silicon steel sheets has the peculiarity of shin effect, and the eddy current loss caused by the AC leakage flux is a significant component of the total iron loss. The calculated results by means of the software MagNet® agree with the measured ones, and show the method presented in this paper is validated.


Cheng Z.,Baoding Tianwei Group Co. | Takahashi N.,Okayama University | Forghani B.,Infolytica Corporation | Liu L.,Baoding Tianwei Group Co. | And 6 more authors.
COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering | Year: 2014

Purpose - The purpose of the paper is to give a review of TEAM Problem 21, focus on its extended progress in engineering-oriented developments, and report the new benchmarking activity undertaken by the authors. Design/methodology/ approach - Testing electromagnetic analysis methods; verify computation models; detail the field behavior of typical magnetic structure; benefit to large-scale numerical modeling. Findings - The calculated results of power loss and magnetic flux for all the member models agree well with the measured ones. The updated Problem 21 Family can now be used to model the saturation effect in the magnetic plate or the lamination by increasing the exciting currents. The new member model P21d-M allows further detailed examination of the electromagnetic behavior inside laminated sheets. The variation of both the iron loss and the magnetic flux with the excitation patterns and magnetic property data can be investigated inside the laminated sheets and the magnetic plate. Originality/value - In order to model the possible saturation level of magnetic steel using Ar-V-Ar or T-O solvers, the exciting currents are increased from 10 to 50?A. In order to model the iron loss and magnetic flux densities inside the laminated sheets, a very simplified model, P21d-M of Problem 21 Family as shown in Figure 2, has been proposed. Copyright © 2014 Emerald Group Publishing Limited. All rights reserved.


Cheng Z.,Baoding Tianwei Group Co. | Takahashi N.,Okayama University | Forghani B.,Infolytica Corporation | Du Y.,Baoding Tianwei Group Co. | And 4 more authors.
IEEE Transactions on Magnetics | Year: 2011

The effect of the variation of B-H properties obtained by different means and data access modes on iron loss and flux in grain oriented (GO) silicon steel laminations is investigated under different exciting frequencies in order to determine an efficient numerical approach to model the lamination configurations. The computational and experimental results are demonstrated on benchmark models in which the 3-D excitation and skin effect play a significant role. © 2011 IEEE.


Cheng Z.,Baoding Tianwei Group Co. | Takahashi N.,Okayama University | Forghani B.,Infolytica Corporation | Gilbert G.,Infolytica Corporation | And 6 more authors.
IEEE Transactions on Magnetics | Year: 2010

In this paper, the effect of different excitation patterns on both the iron loss and flux inside solid magnetic steel plates and laminated silicon steel sheets is investigated. Some practical approaches to nonlinear and anisotropic eddy-current problems under 3-D excitation conditions are proposed, in which the usual measured loss data is not adequate within the penetration depth where the eddy currents are induced by fluxes normal to the lamination. The benchmark results based on member models of Problem 21 with new extensions are presented to validate the proposal and to observe the electromagnetic behavior of the magnetic steel under different excitation patterns. The extensions to the benchmark Problem 21 are helpful for further Testing Electromagnetic Analysis Method (TEAM) activities. © 2006 IEEE.


Cheng Z.,Baoding Tianwei Group Co. | Takahashi N.,Okayama University | Forghani B.,Infolytica Corporation | Moses A.J.,University of Cardiff | And 6 more authors.
IEEE Transactions on Magnetics | Year: 2014

The extended modeling of the magnetic properties of grain oriented electrical steel is presented in this paper which is based on a set of standard and scaled-down Epstein frames and a proposed two-level weighted processing of Epstein data, including the mean magnetic path length, specific magnetization loss and exciting power. The effects of excitation frequency, strip angle, and ambient temperature on the results obtained from the Epstein frames are investigated. It is shown that using the proposed Epstein combination and the two-level weighted processing method is an efficient way of building a model for determining magnetic losses more realistically, hence, improving the value of Epstein strip measurement data. Index Terms - Epstein test, exciting power, grain oriented electrical steel, mean magnetic path length, specific magnetization loss. © 2013 IEEE.

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