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Extended P21-Based Benchmarking
Zhiguang Cheng,
Behzad Forghani,
Tao Liu,
Yana Fan,
Lanrong Liu
Issue:
Volume 5, Issue 1-1, February 2016
Pages:
1-11
Received:
24 August 2015
Accepted:
25 August 2015
Published:
28 September 2015
Abstract: This paper highlights two important aspects of the electromagnetic field modeling and simulation when used for industrial applications, namely the application based benchmarking activities and the magnetic material modeling. It emphasizes the relationship between the two, and briefly reviews the recent progress in extending the TEAM (Testing Electromagnetic Analysis Methods) Problem 21 Family (P21) and the related modeling results, and proposes a new benchmarking project which includes the upgraded benchmark models that can handle extreme excitations, i.e. current sources with a DC bias, as well as multiple harmonics.
Abstract: This paper highlights two important aspects of the electromagnetic field modeling and simulation when used for industrial applications, namely the application based benchmarking activities and the magnetic material modeling. It emphasizes the relationship between the two, and briefly reviews the recent progress in extending the TEAM (Testing Electr...
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Finding Better Solutions to Reduce Computational Effort of Large-Scale Engineering Eddy Current Fields
Dexin Xie,
Zhanxin Zhu,
Dongyang Wu,
Jian Wang
Issue:
Volume 5, Issue 1-1, February 2016
Pages:
12-20
Received:
10 September 2015
Accepted:
11 September 2015
Published:
28 September 2015
Abstract: In the finite element analysis of the engineering eddy current fields in electrical machines and transformers there are the problems such as the huge scale of computation, too long computing time and poor precision which could not meet the demand of engineering accuracy. The current research situation and difficulties of these problems are analyzed in this paper mainly from the aspect of computation methodology. The methods to deal with these problems, e.g., homogenization models of the laminated iron core, the sub-domain perturbation finite element method, domain decomposition method, and EBE (Element by Element) parallel finite element method are described. Their advantages and limitations are discussed, and the authors’ suggestions for the further research strategies are also included.
Abstract: In the finite element analysis of the engineering eddy current fields in electrical machines and transformers there are the problems such as the huge scale of computation, too long computing time and poor precision which could not meet the demand of engineering accuracy. The current research situation and difficulties of these problems are analyzed...
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Magnetic Loss Inside Solid and Laminated Components under Extreme Excitations
Zhiguang Cheng,
Behzad Forghani,
Yang Liu,
Yana Fan,
Tao Liu,
Zhigang Zhao
Issue:
Volume 5, Issue 1-1, February 2016
Pages:
21-30
Received:
24 August 2015
Accepted:
25 August 2015
Published:
29 September 2015
Abstract: The modeling and numerical analysis of the magnetic loss inside components under multi-harmonic and/or DC-biasing excitations are increasingly of concern in large and special electromagnetic devices. This paper aims to investigate efficient and reliable approaches to determine the magnetic losses inside both the solid and laminated components under such extreme excitations. All the proposed approaches presented in the paper are experimentally validated.
Abstract: The modeling and numerical analysis of the magnetic loss inside components under multi-harmonic and/or DC-biasing excitations are increasingly of concern in large and special electromagnetic devices. This paper aims to investigate efficient and reliable approaches to determine the magnetic losses inside both the solid and laminated components under...
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Computation and Analysis of the DC-Biasing Magnetic Field by the Harmonic-Balanced Finite-Element Method
Xiaojun Zhao,
Dawei Guan,
Fanhui Meng,
Yuting Zhong,
Zhiguang Cheng
Issue:
Volume 5, Issue 1-1, February 2016
Pages:
31-36
Received:
21 September 2015
Accepted:
21 September 2015
Published:
12 October 2015
Abstract: This paper sought to present harmonic-balanced method for finite element analysis of nonlinear eddy current field. The harmonic-balanced method can be used to compute the time-periodic electromagnetic field in harmonic domain, considering electric circuits coupled with the nonlinear magnetic field. 2-D and simplified 3-D model of laminated core is established and computed to prove the accuracy and validity of the proposed method. The calculated magnetizing current is compared with the measured results and the computed magnetic field is analyzed to investigate the effect of DC bias.
Abstract: This paper sought to present harmonic-balanced method for finite element analysis of nonlinear eddy current field. The harmonic-balanced method can be used to compute the time-periodic electromagnetic field in harmonic domain, considering electric circuits coupled with the nonlinear magnetic field. 2-D and simplified 3-D model of laminated core is ...
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Fixed-Point Harmonic-Balanced Method for Nonlinear Eddy Current Problems
Xiaojun Zhao,
Yuting Zhong,
Dawei Guan,
Fanhui Meng,
Zhiguang Cheng
Issue:
Volume 5, Issue 1-1, February 2016
Pages:
37-41
Received:
21 September 2015
Accepted:
21 September 2015
Published:
15 October 2015
Abstract: A new method to optimally determine the fixed-point reluctivity is presented to ensure the stable and fast convergence of harmonic solutions. Nonlinear system matrix is linearized by using the fixed-point technique, and harmonic solutions can be decoupled by the diagonal reluctivity matrix. The 1-D and 2-D non-linear eddy current problems under DC-biased magnetization are computed by the proposed method. The computational performance of the new algorithm proves the validity and efficiency of the new algorithm. The corresponding decomposed method is proposed to solve the nonlinear differential equation, in which harmonic solutions of magnetic field and exciting current are decoupled in harmonic domain.
Abstract: A new method to optimally determine the fixed-point reluctivity is presented to ensure the stable and fast convergence of harmonic solutions. Nonlinear system matrix is linearized by using the fixed-point technique, and harmonic solutions can be decoupled by the diagonal reluctivity matrix. The 1-D and 2-D non-linear eddy current problems under DC-...
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Effect of Controllable Distorted Flux on Magnetic Loss inside Laminated Core
Yang Liu,
Guang Ma,
Yana Fan,
Tao Liu,
Lanrong Liu,
Chongyou Jing
Issue:
Volume 5, Issue 1-1, February 2016
Pages:
42-47
Received:
9 October 2015
Accepted:
9 October 2015
Published:
25 October 2015
Abstract: This paper investigates the magnetic properties of grain oriented electrical steel under the controllable distorted flux conditions based on a product-level core model, and examines the effects of the distorted flux on magnetic loss inside the laminated cores with different excitation conditions, involving different harmonic phase difference, harmonic order and harmonic contents.
Abstract: This paper investigates the magnetic properties of grain oriented electrical steel under the controllable distorted flux conditions based on a product-level core model, and examines the effects of the distorted flux on magnetic loss inside the laminated cores with different excitation conditions, involving different harmonic phase difference, harmo...
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Modeling and Analysis of Leakage Flux and Iron Loss Inside Silicon Steel Laminations
Yong Du,
Wanqun Zheng,
Jingjun Zhang
Issue:
Volume 5, Issue 1-1, February 2016
Pages:
48-52
Received:
21 October 2015
Accepted:
22 October 2015
Published:
10 November 2015
Abstract: This paper investigates the leakage flux and the iron loss generated in the laminated silicon sheets of the core or the magnetic shields of large power transformers. A verification model is well established, and proposed parabolic model (non-saturated region) and hybrid model (saturation region) to simulate the magnetic properties of the silicon steel with different angles to the rolling direction. An efficient analysis method is implemented and validated. The calculated and measured results with respect to the test models are in good agreement.
Abstract: This paper investigates the leakage flux and the iron loss generated in the laminated silicon sheets of the core or the magnetic shields of large power transformers. A verification model is well established, and proposed parabolic model (non-saturated region) and hybrid model (saturation region) to simulate the magnetic properties of the silicon st...
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Loss Calculation and Optimization Design of High Frequency Transformer
Lin Li,
Keke Liu,
Xiaoying Zhang,
Ning Zhang
Issue:
Volume 5, Issue 1-1, February 2016
Pages:
53-56
Received:
21 October 2015
Accepted:
22 October 2015
Published:
30 November 2015
Abstract: In this paper, the magnetization and loss properties are analyzed and compared of topical magnetic materials. The calculation methods are studied for the losses of the core and windings of the High Frequency Transformer (HFT). Based on the evaluation of the temperature increment, an optimization method is presented for the design of HFT. Finally, the losses of a test model of HFT is calculated and the results are compared with those tested.
Abstract: In this paper, the magnetization and loss properties are analyzed and compared of topical magnetic materials. The calculation methods are studied for the losses of the core and windings of the High Frequency Transformer (HFT). Based on the evaluation of the temperature increment, an optimization method is presented for the design of HFT. Finally, t...
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FEMAG: A High Performance Parallel Finite Element Toolbox for Electromagnetic Computations
Tao Cui,
Xue Jiang,
Weiying Zheng
Issue:
Volume 5, Issue 1-1, February 2016
Pages:
57-64
Received:
9 November 2015
Accepted:
9 November 2015
Published:
30 November 2015
Abstract: This paper presents a parallel finite element toolbox for computing large electromagnetic devices on unstructured tetrahedral meshes, FEMAG—Fem for ElectroMagnetics on Adaptive Grids. The finite element toolbox deals with unstructured tetrahedral meshes and can solve electromagnetic eddy current problems in both frequency domain and time domain. It adopts high-order edge element methods and refines the mesh adaptively based on reliable and efficient finite element a posteriori error estimates. We demonstrate the competitive performance of FEMAG by extensive numerical experiments, including TEAM (Testing Electromagnetic Analysis Methods) Problem 21 and the simulation for a single-phase power transformer.
Abstract: This paper presents a parallel finite element toolbox for computing large electromagnetic devices on unstructured tetrahedral meshes, FEMAG—Fem for ElectroMagnetics on Adaptive Grids. The finite element toolbox deals with unstructured tetrahedral meshes and can solve electromagnetic eddy current problems in both frequency domain and time domain. It...
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Research on Magnetostriction Property of Silicon Steel Sheets
Yanli Zhang,
Yuandi Wang,
Dianhai Zhang,
Ziyan Ren,
Dexin Xie
Issue:
Volume 5, Issue 1-1, February 2016
Pages:
65-74
Received:
30 November 2015
Accepted:
1 December 2015
Published:
17 December 2015
Abstract: When electrical devices such as electrical machines and transformers are in operation, the magnetostriction of the silicon steel sheets results in the deformation of the laminated iron core, which aggravates the vibration and noise of the iron core. Therefore, it is of significance to study the relationship between the magnetostrictive effect and external magnetic field. The aim of this paper is to report the researches finished, in progress, and to be done by the authors’ group, so as to discuss the idea how to investigate the magnetostriction property of the silicon steel sheets, whether non-oriented or grain-oriented. Measurement method, property model formulation, and the application of the model to finite element analysis are described. The relative numerical results are given.
Abstract: When electrical devices such as electrical machines and transformers are in operation, the magnetostriction of the silicon steel sheets results in the deformation of the laminated iron core, which aggravates the vibration and noise of the iron core. Therefore, it is of significance to study the relationship between the magnetostrictive effect and e...
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Summary of the Special Issue “Numerical Analysis, Material Modeling and Validation for Magnetic Losses in Electromagnetic Devices”
Issue:
Volume 5, Issue 1-1, February 2016
Pages:
75-77
Received:
14 December 2015
Accepted:
16 December 2015
Published:
27 January 2016
