Pub Date : 2020-11-16DOI: 10.1109/CEFC46938.2020.9451364
Zhang Poming, Ma Qishuang, Xu Ping
This paper presents an accurate 6/4 switched reluctance machine (SRM) model based on an improved conformal mapping (CM) method. Subdomain method is used to solve the vector magnetic potential of the transformed simple region, and electromagnetic torque is calculated. The developed method is verified by comparing its results with those obtained from the finite element method (FEM).
{"title":"Magnetic Field Calculation of Switched Reluctance Machines Using an Improved Conformal Mapping Method","authors":"Zhang Poming, Ma Qishuang, Xu Ping","doi":"10.1109/CEFC46938.2020.9451364","DOIUrl":"https://doi.org/10.1109/CEFC46938.2020.9451364","url":null,"abstract":"This paper presents an accurate 6/4 switched reluctance machine (SRM) model based on an improved conformal mapping (CM) method. Subdomain method is used to solve the vector magnetic potential of the transformed simple region, and electromagnetic torque is calculated. The developed method is verified by comparing its results with those obtained from the finite element method (FEM).","PeriodicalId":439411,"journal":{"name":"2020 IEEE 19th Biennial Conference on Electromagnetic Field Computation (CEFC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122432642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-16DOI: 10.1109/cefc46938.2020.9451226
Jingying Liu, Zhonghuai Chen, Jing Zhou, Hui Sun
In this paper, a compact triplex-layer and low-frequency metamaterial design scheme is presented. The triplex-layer metal cell can be extended easily and allows for the construction of 5x5 unit-cell sample with dimensions of 36mm x 36mm and operating at a working frequency of 6.78MHz. Results show that using the metamaterial sample in a wireless power transfer (WPT) system results in an efficiency enhancement of 26.8% at a working distance of 15 cm. From simulations and experiments, it is found that the proposed system outperforms two-layer metamaterial-coupled WPT system in terms of efficiency, range and size.
本文提出了一种紧凑的三层低频超材料设计方案。三层金属电池可以很容易地扩展，并允许构建5x5单元电池样品，尺寸为36mm x 36mm，工作频率为6.78MHz。结果表明，在工作距离为15 cm的无线电力传输系统中使用该超材料样品，效率提高26.8%。仿真和实验结果表明，该系统在效率、范围和尺寸上都优于两层超材料耦合WPT系统。
{"title":"Compact Triplex-layer Metamaterials Design for Wireless Power Transfer Efficiency Enhancement","authors":"Jingying Liu, Zhonghuai Chen, Jing Zhou, Hui Sun","doi":"10.1109/cefc46938.2020.9451226","DOIUrl":"https://doi.org/10.1109/cefc46938.2020.9451226","url":null,"abstract":"In this paper, a compact triplex-layer and low-frequency metamaterial design scheme is presented. The triplex-layer metal cell can be extended easily and allows for the construction of 5x5 unit-cell sample with dimensions of 36mm x 36mm and operating at a working frequency of 6.78MHz. Results show that using the metamaterial sample in a wireless power transfer (WPT) system results in an efficiency enhancement of 26.8% at a working distance of 15 cm. From simulations and experiments, it is found that the proposed system outperforms two-layer metamaterial-coupled WPT system in terms of efficiency, range and size.","PeriodicalId":439411,"journal":{"name":"2020 IEEE 19th Biennial Conference on Electromagnetic Field Computation (CEFC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114553164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-16DOI: 10.1109/CEFC46938.2020.9451292
K. Alkama, G. Meunier, O. Chadebec, J. Guichon, B. Bannwarth, E. Vialardi, R. Perrin-Bit
Computational strategies improvements for the inductive unstructured PEEC method are presented in order to address efficiently low frequencies electromagnetic problems. Couplings between volume, surface and line regions have been developed to reduce the number of degrees of freedom and thus the computational cost. Good accuracy on results is ensured thanks to the use of an adaptive Gauss integration procedure for the computation of near interactions. Multi-threaded AMLFMM matrix compression algorithm is used to speed-up far interactions computation. External circuit components can also be coupled to the meshed conductive regions.
{"title":"Computational Strategies Improvement For The Unstructured Inductive PEEC Method","authors":"K. Alkama, G. Meunier, O. Chadebec, J. Guichon, B. Bannwarth, E. Vialardi, R. Perrin-Bit","doi":"10.1109/CEFC46938.2020.9451292","DOIUrl":"https://doi.org/10.1109/CEFC46938.2020.9451292","url":null,"abstract":"Computational strategies improvements for the inductive unstructured PEEC method are presented in order to address efficiently low frequencies electromagnetic problems. Couplings between volume, surface and line regions have been developed to reduce the number of degrees of freedom and thus the computational cost. Good accuracy on results is ensured thanks to the use of an adaptive Gauss integration procedure for the computation of near interactions. Multi-threaded AMLFMM matrix compression algorithm is used to speed-up far interactions computation. External circuit components can also be coupled to the meshed conductive regions.","PeriodicalId":439411,"journal":{"name":"2020 IEEE 19th Biennial Conference on Electromagnetic Field Computation (CEFC)","volume":"338 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124743135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-16DOI: 10.1109/CEFC46938.2020.9451417
Odirlan Iaronka, J. P. Assumpcão Bastos, W. P. Carpes
The complexity of the dielectric design of the oil isolated power transformer increases with the voltage amplitude applied to the equipment. For a project with a dielectric safety margin and adequate manufacturing costs, it is necessary to develop a design methodology for all transformer points for any voltage and power levels. This work proposes a methodology for the dielectric design and calculation of the insulation safety margin of the connection elements external to the windings. The method is based on numerical computer simulations using the Finite Element Method (FEM) and the Cumulative Stress Method (CSM).
{"title":"Dielectric design methodology of power transformers based on the cumulative stress method","authors":"Odirlan Iaronka, J. P. Assumpcão Bastos, W. P. Carpes","doi":"10.1109/CEFC46938.2020.9451417","DOIUrl":"https://doi.org/10.1109/CEFC46938.2020.9451417","url":null,"abstract":"The complexity of the dielectric design of the oil isolated power transformer increases with the voltage amplitude applied to the equipment. For a project with a dielectric safety margin and adequate manufacturing costs, it is necessary to develop a design methodology for all transformer points for any voltage and power levels. This work proposes a methodology for the dielectric design and calculation of the insulation safety margin of the connection elements external to the windings. The method is based on numerical computer simulations using the Finite Element Method (FEM) and the Cumulative Stress Method (CSM).","PeriodicalId":439411,"journal":{"name":"2020 IEEE 19th Biennial Conference on Electromagnetic Field Computation (CEFC)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130578132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-16DOI: 10.1109/CEFC46938.2020.9451510
N. Marconato, P. Bettini, P. Alotto, R. Cavazzana, L. Marrelli, R. Torchio, D. Voltolina
This paper presents a model based procedure for in situ error compensation of spatially distributed magnetic sensors. The proposed approach is numerically validated on RFX-mod, a magnetically confined plasma experiment presently being upgraded with a new magnetic diagnostic system and a state-of-the-art real time control system. The numerical simulations are performed with the CAFE code; synthetic measurements are used to assess the reliability of the proposed method.
{"title":"Model Based Procedure for in Situ Error Compensation of Spatially Distributed Magnetic Sensors","authors":"N. Marconato, P. Bettini, P. Alotto, R. Cavazzana, L. Marrelli, R. Torchio, D. Voltolina","doi":"10.1109/CEFC46938.2020.9451510","DOIUrl":"https://doi.org/10.1109/CEFC46938.2020.9451510","url":null,"abstract":"This paper presents a model based procedure for in situ error compensation of spatially distributed magnetic sensors. The proposed approach is numerically validated on RFX-mod, a magnetically confined plasma experiment presently being upgraded with a new magnetic diagnostic system and a state-of-the-art real time control system. The numerical simulations are performed with the CAFE code; synthetic measurements are used to assess the reliability of the proposed method.","PeriodicalId":439411,"journal":{"name":"2020 IEEE 19th Biennial Conference on Electromagnetic Field Computation (CEFC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114618953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-16DOI: 10.1109/CEFC46938.2020.9451425
Marina Gasparini Pinho, V. C. Silva, L. Lebensztajn
This work presents the determination of the resistance of multilayer grounding systems by a finite elements analysis with an optimization of the soil stratification and an appropriate truncation method for 3D domains. Based on experimental resistivity data, the optimization process of the stratification was carried out by a Genetic Algorithm. The Perfectly Matched Layers technique was used to truncate the 3D open boundary. The results obtained with the association of these two tools developed in this work were validated experimentally.
{"title":"Numerical Determination of Grounding Resistance in Multilayer Soil with Stratification Optimized by a Genetic Algorithm","authors":"Marina Gasparini Pinho, V. C. Silva, L. Lebensztajn","doi":"10.1109/CEFC46938.2020.9451425","DOIUrl":"https://doi.org/10.1109/CEFC46938.2020.9451425","url":null,"abstract":"This work presents the determination of the resistance of multilayer grounding systems by a finite elements analysis with an optimization of the soil stratification and an appropriate truncation method for 3D domains. Based on experimental resistivity data, the optimization process of the stratification was carried out by a Genetic Algorithm. The Perfectly Matched Layers technique was used to truncate the 3D open boundary. The results obtained with the association of these two tools developed in this work were validated experimentally.","PeriodicalId":439411,"journal":{"name":"2020 IEEE 19th Biennial Conference on Electromagnetic Field Computation (CEFC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127588653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-16DOI: 10.1109/CEFC46938.2020.9451381
G. Tolentino, J. Leite, G. Parent, N. Batistela
In this work the magnetic anisotropy phenomenon in ferromagnetic materials was modeled using Orientation Distribution Function (ODF). The ODF is a concept that can be used to model the first magnetization curve of electrical steel sheet along any magnetization direction. The model is inserted in a 2D Finite Element (FE) field calculation software with vector magnetic potential formulation. Aspects related to the inclusion of the model in the formulation and its performance are discussed.
{"title":"Implementation of the Magnetic Anisotropy in 2D Finite Element Method Using the Theory of Orientation Distribution Functions","authors":"G. Tolentino, J. Leite, G. Parent, N. Batistela","doi":"10.1109/CEFC46938.2020.9451381","DOIUrl":"https://doi.org/10.1109/CEFC46938.2020.9451381","url":null,"abstract":"In this work the magnetic anisotropy phenomenon in ferromagnetic materials was modeled using Orientation Distribution Function (ODF). The ODF is a concept that can be used to model the first magnetization curve of electrical steel sheet along any magnetization direction. The model is inserted in a 2D Finite Element (FE) field calculation software with vector magnetic potential formulation. Aspects related to the inclusion of the model in the formulation and its performance are discussed.","PeriodicalId":439411,"journal":{"name":"2020 IEEE 19th Biennial Conference on Electromagnetic Field Computation (CEFC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130453541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-16DOI: 10.1109/CEFC46938.2020.9451390
B. S. Park, J. O. Park, I. Park
An object's shape may be deformed by a combination of gravitational, hydrostatic, mechanical, and electromagnetic forces. Therefore, to predict the deformation, it is necessary to know each force's distribution inside the object. Various expressions and methods, such as the Lorentz, Kelvin, generalized, and Korteweg-Helmholtz forces, can be used to calculate the electromagnetic force on a dielectric or magnetic material. However, the distributions of the aforementioned forces inside materials may differ significantly. We adopt the concepts of infinitesimal particles and external electromagnetic fields to address this issue. Adopting these concepts enables the electromagnetic force densities inside dielectric or magnetic materials to be uniquely determined. We refer to this type of density as the locally defined electromagnetic force density (FLEM). This study primarily focuses on the derivation of F(LEM)• Subsequently, the distribution of FLEMis then demonstrated using simple numerical models.
{"title":"Locally Defined Electromagnetic Force Density Inside Materials","authors":"B. S. Park, J. O. Park, I. Park","doi":"10.1109/CEFC46938.2020.9451390","DOIUrl":"https://doi.org/10.1109/CEFC46938.2020.9451390","url":null,"abstract":"An object's shape may be deformed by a combination of gravitational, hydrostatic, mechanical, and electromagnetic forces. Therefore, to predict the deformation, it is necessary to know each force's distribution inside the object. Various expressions and methods, such as the Lorentz, Kelvin, generalized, and Korteweg-Helmholtz forces, can be used to calculate the electromagnetic force on a dielectric or magnetic material. However, the distributions of the aforementioned forces inside materials may differ significantly. We adopt the concepts of infinitesimal particles and external electromagnetic fields to address this issue. Adopting these concepts enables the electromagnetic force densities inside dielectric or magnetic materials to be uniquely determined. We refer to this type of density as the locally defined electromagnetic force density (FLEM). This study primarily focuses on the derivation of F(LEM)• Subsequently, the distribution of FLEMis then demonstrated using simple numerical models.","PeriodicalId":439411,"journal":{"name":"2020 IEEE 19th Biennial Conference on Electromagnetic Field Computation (CEFC)","volume":"os-44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127782494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-16DOI: 10.1109/CEFC46938.2020.9451465
I. C. Garcia, Iryna Kulchytska-Ruchka, M. Clemens, S. Schöps
The time domain analysis of eddy current problems often requires the simulation of long time intervals, e.g. until a steady state is reached. Fast-switching excitations e.g. in pulsed-width modulated signals require in addition very small time step sizes that significantly increase computation time. To speed up the simulation, parallel-in-time methods can be used. In this paper, we investigate the combination of explicit and implicit time integration methods in the context of the parallel-in-time method Parareal and using a simplified model for the coarse propagator.
{"title":"Parallel-in-Time Solution of Eddy Current Problems Using Implicit and Explicit Time-stepping Methods","authors":"I. C. Garcia, Iryna Kulchytska-Ruchka, M. Clemens, S. Schöps","doi":"10.1109/CEFC46938.2020.9451465","DOIUrl":"https://doi.org/10.1109/CEFC46938.2020.9451465","url":null,"abstract":"The time domain analysis of eddy current problems often requires the simulation of long time intervals, e.g. until a steady state is reached. Fast-switching excitations e.g. in pulsed-width modulated signals require in addition very small time step sizes that significantly increase computation time. To speed up the simulation, parallel-in-time methods can be used. In this paper, we investigate the combination of explicit and implicit time integration methods in the context of the parallel-in-time method Parareal and using a simplified model for the coarse propagator.","PeriodicalId":439411,"journal":{"name":"2020 IEEE 19th Biennial Conference on Electromagnetic Field Computation (CEFC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133757624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-16DOI: 10.1109/CEFC46938.2020.9451454
Jiahao Li, Guolai Yang, Yumeng Fan
This paper addresses the braking characteristics of a permanent magnet eddy-current brake under strong impact load. The acceleration of the eddy current brake (ECB) will be very large under the action of strong impact load. It is observed that the braking force characteristics of the ECB in high acceleration are different from those under quasi-static condition. That is, braking force is no longer a single function of velocity. At first, the quasi-static analytical model is established by solving boundary value problems using Fourier series. And then the accuracy of the quasi-static analytical model and the two-dimensional finite element model (FEM) is verified by comparing the results of the two models. Finally, the braking force characteristics of eddy-current brake under strong impact load and the influence of related factors on its braking force characteristics are analyzed using the FEM to provide valuable information for the design of this kind of ECB.
{"title":"Characteristic Analysis of a Permanent Magnet Eddy-Current Brake Under Strong Impact Load","authors":"Jiahao Li, Guolai Yang, Yumeng Fan","doi":"10.1109/CEFC46938.2020.9451454","DOIUrl":"https://doi.org/10.1109/CEFC46938.2020.9451454","url":null,"abstract":"This paper addresses the braking characteristics of a permanent magnet eddy-current brake under strong impact load. The acceleration of the eddy current brake (ECB) will be very large under the action of strong impact load. It is observed that the braking force characteristics of the ECB in high acceleration are different from those under quasi-static condition. That is, braking force is no longer a single function of velocity. At first, the quasi-static analytical model is established by solving boundary value problems using Fourier series. And then the accuracy of the quasi-static analytical model and the two-dimensional finite element model (FEM) is verified by comparing the results of the two models. Finally, the braking force characteristics of eddy-current brake under strong impact load and the influence of related factors on its braking force characteristics are analyzed using the FEM to provide valuable information for the design of this kind of ECB.","PeriodicalId":439411,"journal":{"name":"2020 IEEE 19th Biennial Conference on Electromagnetic Field Computation (CEFC)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114570580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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