20.500.12556/DKUM-58845 DOLOČANJE MAGNETNIH LASTNOSTI IN IZGUB MAGNETNIH TEKOČIN DETERMINATION OF MAGNETIC PROPERTIES AND THE LOSSES OF MAGNETIC FLUIDS Magnetne tekočine so tekočine, v katerih so enakomerno porazdeljeni zelo majhni nanodelci magnetnega materiala, ki so trajno suspendirani v nosilni tekočini. Zaradi svojih posebnih lastnosti jih danes uporabljamo na različnih področjih strojništva in biomedicine. V magistrskem delu je opisan postopek merjenja magnetnih izgub pri vzorcu magnetne tekočine. Meritve smo izvedli v laboratoriju po metodi magnetnega merjenja pri konstnatni ferkvenci in različnih temparaturah vzorca. Pri tej metodi s pomočjo dveh merilnih tuljavic izmerimo magnetno poljsko jakost, gostoto magnetnega pretoka in magnetno polarizacijo. S pomočjo teh signalov tvorimo histerezno zanko, katere površina določa izgube. Na podlagi dobljenih rezultatov so določene specifične moči izgub SPL (specific power loss). Rezultati so podani v grafični obliki in prikazujejo, da se z višanjem temparature vzorca izgube magnetne tekočine manjšajo. Magnetic fluids are fluids containing evenly distributed small nano-particles of the magnetic material, which are permanently suspended in the carrier fluid. Nowadays, we use them in fields of mechanical engineering and biomedical sciences, due to their special features. The thesis describes the proces of measuring the magnetic losses in a sample of the magnetic fluid. The measurements were performed in the laboratory using the magnetic measurement method at a constant frequency and different temparature of the sample. In this method, we measure magnetic field strenght, magnetic flux density and magnetic polarization with the help of two pickup coils. With the help of these signals, we form a hysteresis loop, the surface of which provides losses. Based on the results, we determine specific power losses SPL. The results are presented in a graphical form and show that by increasing temparature of the sample, losses of the magnetic fluid are decreasing. magnetne tekočine magnetne izgube metoda magnetnega merjenja magnetic fluids magnetic losses magnetic measurements true true false M. Kovač Slovenski jezik Angleški jezik Magistrsko delo/naloga 2016-04-28 10:00:21 2016-05-25 15:21:40 2022-06-19 03:05:31 2019-07-11 10:53:49 2016 0 [Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.313.5(043.2) 19604758 URN:SI:UM:DK:CZMWVZVB MAG_Kovac_Matej_2016.pdf MAG_Kovac_Matej_2016.pdf 1 28E271435D5449D6B79C5018A6E4BA3E 085c03ac6ddd72e8aefc31b82bd7622a21a9139bbecc17e1eacd0483c119066d 6b1b72d4-7c0c-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=91012 Fakulteta za elektrotehniko, računalništvo in informatiko 0 0 0