Efficient finite element method to estimate eddy current loss due to random interlaminar contacts in electrical sheets

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@article{aed32dffcfd6496d902b0ef29591d771,
title = "Efficient finite element method to estimate eddy current loss due to random interlaminar contacts in electrical sheets",
keywords = "Eddy current, Finite element analysis, Monte Carlo method, Polynomial chaos expansion, Random field, Uncertainty quantification",
author = "Shah, {Sahas Bikram} and Paavo Rasilo and Harri Hakula and Antero Arkkio",
year = "2017",
month = "5",
doi = "10.1002/jnm.2254",
journal = "INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS DEVICES AND FIELDS",
issn = "0894-3370",
publisher = "John Wiley and Sons Ltd",

}

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TY - JOUR

T1 - Efficient finite element method to estimate eddy current loss due to random interlaminar contacts in electrical sheets

AU - Shah,Sahas Bikram

AU - Rasilo,Paavo

AU - Hakula,Harri

AU - Arkkio,Antero

PY - 2017/5/24

Y1 - 2017/5/24

N2 - Electrical sheets of electrical machines are laminated to reduce eddy current loss. However, a series of punching and pressing processes form random galvanic contacts at the edges of the sheets. These galvanic contacts are random in nature and cause an additional eddy current loss in the laminated cores. In this paper, a stochastic Galerkin finite element method is implemented to consider random interlaminar contacts in the magnetic vector potential formulation. The random interlaminar conductivities at the edges of the electrical sheets are approximated using a conductivity field and propagated through the finite element formulation. The spatial random variation of the conductivity causes the solution to be random, and hence, it is approximated by using a polynomial chaos expansion method. Finally, the additional eddy current losses due to the interlaminar contacts are estimated from a stochastic Galerkin method and compared with a Monte Carlo method. Accuracy and computation time of both models are discussed in the paper.

AB - Electrical sheets of electrical machines are laminated to reduce eddy current loss. However, a series of punching and pressing processes form random galvanic contacts at the edges of the sheets. These galvanic contacts are random in nature and cause an additional eddy current loss in the laminated cores. In this paper, a stochastic Galerkin finite element method is implemented to consider random interlaminar contacts in the magnetic vector potential formulation. The random interlaminar conductivities at the edges of the electrical sheets are approximated using a conductivity field and propagated through the finite element formulation. The spatial random variation of the conductivity causes the solution to be random, and hence, it is approximated by using a polynomial chaos expansion method. Finally, the additional eddy current losses due to the interlaminar contacts are estimated from a stochastic Galerkin method and compared with a Monte Carlo method. Accuracy and computation time of both models are discussed in the paper.

KW - Eddy current

KW - Finite element analysis

KW - Monte Carlo method

KW - Polynomial chaos expansion

KW - Random field

KW - Uncertainty quantification

UR - http://www.scopus.com/inward/record.url?scp=85019629447&partnerID=8YFLogxK

U2 - 10.1002/jnm.2254

DO - 10.1002/jnm.2254

M3 - Article

JO - INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS DEVICES AND FIELDS

T2 - INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS DEVICES AND FIELDS

JF - INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS DEVICES AND FIELDS

SN - 0894-3370

ER -

ID: 14052756