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Materiale electrotehnice noi

Materiale electrotehnice noi. Magnetizarea materialelor. Structura disciplinei. 1. Fenomene in materiale electrotehnice. Conductia electrica Polarizarea electrica Magnetizarea materialelor Pierderi in materialele electrotehnice. Magnetizarea materialelor.

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Materiale electrotehnice noi

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  1. Materiale electrotehnice noi Magnetizarea materialelor Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I Prof.dr.ing.Florin Ciuprina

  2. Structura disciplinei

  3. 1. Fenomene in materiale electrotehnice • Conductia electrica • Polarizarea electrica • Magnetizarea materialelor • Pierderi in materialele electrotehnice

  4. Magnetizarea materialelor Intensitatea campului magnetic: H [A/m] Inductia magnetica: B [T] Magnetizatia:

  5. Materiale: • diamagnetice – particule magnetic nepolare • paramagnetice • feromagnetice – particule magnetic polare • ferimagnetice • antiferomagnetice

  6. Materiale: • diamagnetice – materiale nemagnetice • paramagnetice • feromagnetice • ferimagnetice • antiferomagnetice

  7. Materiale: • diamagnetice • paramagnetice • feromagnetice – materiale magnetice • ferimagnetice • antiferomagnetice

  8. Camp magnetic activ (interior):

  9. Diamagnetismul Materiale diamagnetice: Cu, Au, Ag, Zn, Pb, gaze nobile, etc. Joseph Larmor (1857-1942) matematician si fizician irlandez

  10. Paramagnetismul Materiale paramagnetice: Al, Cr, Mn, Na, etc. Stefan Procopiu (1890-1972), fizician roman

  11. Feromagnetismul Materiale feromagnetice: Fe, Co, Ni, Gd, aliaje. Pierre-Ernest Weiss (1865-1940) fizician francez Felix Bloch (1905-1983) fizician american nascut in Elvetia

  12. Feromagnetismul Mecanismul magnetizarii: deplasarea peretilor Bloch Relatia Curie-Weiss: Pierre Curie (1859-1906) fizician francez

  13. Feromagnetismul

  14. Ferimagnetismul si antiferomagnetismul • Particule magnetic polare • Domenii magnetice & pereti Bloch • Momentele magnetice ale atomilor diferiti – antiparalele in acelasi domeniu • mx ≠ my – materiale ferimagnetice • mx = my – materiale antiferomagnetice

  15. Materiale ferimagnetice • mx ≠ my – materiale ferimagnetice

  16. Materiale antiferomagnetice • mx = my – materiale antiferomagnetice Louis Eugene Felix Neel(1904-2000), fizician francez

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