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Abstract
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.
Original language | English |
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Number of pages | 8 |
Journal | INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS DEVICES AND FIELDS |
Volume | 31 |
Issue number | 4 |
Early online date | 24 May 2017 |
DOIs | |
Publication status | Published - 2018 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Eddy current
- Finite element analysis
- Monte Carlo method
- Polynomial chaos expansion
- Random field
- Uncertainty quantification
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Dive into the research topics of 'Efficient finite element method to estimate eddy current loss due to random interlaminar contacts in electrical sheets'. Together they form a unique fingerprint.Projects
- 1 Finished
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ALEM: Additional Losses in Electrical Machines
Lehikoinen, A. (Project Member), Belahcen, A. (Project Member), Upadhaya, B. (Project Member), Osemwinyen, O. (Project Member), Aydin, U. (Project Member), Balasubramanian, A. (Project Member), Arkkio, A. (Principal investigator), Rasilo, P. (Project Member), Nair, D. (Project Member), Shah, S. (Project Member), Sundaria, R. (Project Member), Singh, D. (Project Member), Hemeida, A. (Project Member), Razzaq, M. (Project Member) & Rouhi, H. (Project Member)
01/03/2014 → 28/02/2019
Project: EU: ERC grants