Modeling of Core Losses in Electrical Machine Laminations Exposed to High Frequency and Non-sinusoidal Flux

Electrical machines account for about 60% of the electricity consumption in industrial countries; hence a huge energy savings could be achieved by even a small increment in the machine efficiency. Improving the designs of electrical machines requires accurate quantification of the machine losses. A...

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Main Author: Ibrahim, Maged
Format: Others
Published: 2011
Online Access:http://spectrum.library.concordia.ca/35760/1/Ibrahim_MSc_F2011.pdf
Ibrahim, Maged <http://spectrum.library.concordia.ca/view/creators/Ibrahim=3AMaged=3A=3A.html> (2011) Modeling of Core Losses in Electrical Machine Laminations Exposed to High Frequency and Non-sinusoidal Flux. Masters thesis, Concordia University.
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spelling ndltd-LACETR-oai-collectionscanada.gc.ca-QMG.357602013-10-22T03:46:38Z Modeling of Core Losses in Electrical Machine Laminations Exposed to High Frequency and Non-sinusoidal Flux Ibrahim, Maged Electrical machines account for about 60% of the electricity consumption in industrial countries; hence a huge energy savings could be achieved by even a small increment in the machine efficiency. Improving the designs of electrical machines requires accurate quantification of the machine losses. A significant portion of the losses in electrical machines is caused by the core loss in the magnetic material. The physical mechanism of core losses is still an open problem, and most of the available core loss models are based on limited curve fitting techniques, instead of a physical understanding of magnetic material behaviour. In this thesis, a new method is proposed to separate the core loss components in laminations exposed to high frequency excitations. Accurate separation of core losses is achieved by calculating the hysteresis energy loss at each frequency, taking into account the flux density distribution. The results highlight that the conventional assumption of constant hysteresis energy loss per cycle is only valid at low frequencies, where skin effect is negligible. In addition to the new separation method, a physics based core loss model is developed to estimate core losses in electrical machine laminations exposed to non-sinusoidal flux. The developed model accounts for the effects of the non-uniform flux density inside the lamination. The model results are verified experimentally by comparing with the measured core losses in laminations exposed to the flux waveforms in different sections of permanent magnet (PM) and switched reluctance (SR) machines. 2011-09-09 Thesis NonPeerReviewed application/pdf http://spectrum.library.concordia.ca/35760/1/Ibrahim_MSc_F2011.pdf Ibrahim, Maged <http://spectrum.library.concordia.ca/view/creators/Ibrahim=3AMaged=3A=3A.html> (2011) Modeling of Core Losses in Electrical Machine Laminations Exposed to High Frequency and Non-sinusoidal Flux. Masters thesis, Concordia University. http://spectrum.library.concordia.ca/35760/
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format Others
sources NDLTD
description Electrical machines account for about 60% of the electricity consumption in industrial countries; hence a huge energy savings could be achieved by even a small increment in the machine efficiency. Improving the designs of electrical machines requires accurate quantification of the machine losses. A significant portion of the losses in electrical machines is caused by the core loss in the magnetic material. The physical mechanism of core losses is still an open problem, and most of the available core loss models are based on limited curve fitting techniques, instead of a physical understanding of magnetic material behaviour. In this thesis, a new method is proposed to separate the core loss components in laminations exposed to high frequency excitations. Accurate separation of core losses is achieved by calculating the hysteresis energy loss at each frequency, taking into account the flux density distribution. The results highlight that the conventional assumption of constant hysteresis energy loss per cycle is only valid at low frequencies, where skin effect is negligible. In addition to the new separation method, a physics based core loss model is developed to estimate core losses in electrical machine laminations exposed to non-sinusoidal flux. The developed model accounts for the effects of the non-uniform flux density inside the lamination. The model results are verified experimentally by comparing with the measured core losses in laminations exposed to the flux waveforms in different sections of permanent magnet (PM) and switched reluctance (SR) machines.
author Ibrahim, Maged
spellingShingle Ibrahim, Maged
Modeling of Core Losses in Electrical Machine Laminations Exposed to High Frequency and Non-sinusoidal Flux
author_facet Ibrahim, Maged
author_sort Ibrahim, Maged
title Modeling of Core Losses in Electrical Machine Laminations Exposed to High Frequency and Non-sinusoidal Flux
title_short Modeling of Core Losses in Electrical Machine Laminations Exposed to High Frequency and Non-sinusoidal Flux
title_full Modeling of Core Losses in Electrical Machine Laminations Exposed to High Frequency and Non-sinusoidal Flux
title_fullStr Modeling of Core Losses in Electrical Machine Laminations Exposed to High Frequency and Non-sinusoidal Flux
title_full_unstemmed Modeling of Core Losses in Electrical Machine Laminations Exposed to High Frequency and Non-sinusoidal Flux
title_sort modeling of core losses in electrical machine laminations exposed to high frequency and non-sinusoidal flux
publishDate 2011
url http://spectrum.library.concordia.ca/35760/1/Ibrahim_MSc_F2011.pdf
Ibrahim, Maged <http://spectrum.library.concordia.ca/view/creators/Ibrahim=3AMaged=3A=3A.html> (2011) Modeling of Core Losses in Electrical Machine Laminations Exposed to High Frequency and Non-sinusoidal Flux. Masters thesis, Concordia University.
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