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1.
Dimenzioniranje sinhronskega motorja s trajnimi magneti z uporabo metode končnih elementov
Jernej Brodej, 2018, master's thesis

Abstract: V magistrskem delu je predstavljen sinhronski stroj, njegovo delovanje in sestavni deli. Podrobneje je opisan in analiziran sinhronski motor s trajnimi magneti. Prikazana in predstavljena je konfiguracija motorja, ki se uporablja za električni pogon vozila. Nato je prikazan postopek načrtovanja v programskem paketu Flux, ki deluje na principu metode končnih elementov. V drugem delu naloge so prikazani postopki optimiranja motorja, s katerimi dosežemo največji izkoristek in navor motorja.
Keywords: sinhronski motor, trajni magnet, metoda končnih elementov.
Published: 21.11.2018; Views: 556; Downloads: 87
.pdf Full text (3,00 MB)

2.
The "magnet effect" - a powerful source of L1 dialect interference in the pronunciation of English as a foreign language
Klementina Penelope Jurančič, 2014, original scientific article

Abstract: Wieden and Nemser (1991) carried out a study investigating the development of pronunciation of English as a foreign language in Austria. One of the main issues in this research was L1 dialect interference. Individual studies have proven that the pronunciation of a second (L2) or foreign language (FL) is not influenced only by the standard variety of the first language (L1), but also by the L1 dialect of the speaker's place of origin (Karpf et al. 1980). Wieden and Nemser's study wished to prove this on a larger scale. A similar study was carried out also for Slovenia (Jurančič Petek 2007). Contrastive analysis (CA) of the Slovene Standard pronunciation and English was performed as well as that of the sound systems of individual Slovene dialects and the English one. Error analysis (EA) of the obtained results showed that L1 dialect interference did not occur in the instances predicted by contrastive analysis; however the study in itself did prove the existence of such influence ("magnet effect" in vowels).
Keywords: English language, magnet effect, monophthongs, dialect interference, pronunciation, L1 dialect interference, pronunciation of English
Published: 16.05.2017; Views: 578; Downloads: 113
.pdf Full text (338,64 KB)
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3.
Računalniško podprt razvoj magnetnega obeska
Jernej Klančnik, 2017, bachelor thesis/paper

Abstract: Raziskava obravnava računalniško podprt razvoj konkretnega izdelka. Predstavljena so orodja − programski paketi in tipični formati datotek, ki so bili uporabljeni za razvoj magnetnega obeska. Kratko so opisane fizikalne lastnosti materialov, psihološki vpliv barv in fiziološki učinki plastike, magneta in vrvice. Magnetni obesek je bil pretežno oblikovan z orodjem Adobe Illustrator. Razvoj je trajal 3 mesece, investicija pa se je povrnila v približno dveh letih.
Keywords: računalniško podprto oblikovanje, psihologija barv, magnet, programi Adobe
Published: 23.02.2017; Views: 493; Downloads: 55
.pdf Full text (1,27 MB)

4.
UGOTAVLJANJE TRDOTE VODE IN IZLOČANJE VODNEGA KAMNA
Nina Vičar, 2015, master's thesis

Abstract: V magistrskem delu smo preučevali problematiko izločanja vodnega kamna iz vode na črpališču v Sp. Ščavnici. Izmerili smo relevantne fizikalno-kemijske parametre. Na podlagi rezultatov meritev smo se odločili za elektromagnetno napravo in permanentni magnet, ki na kristalizacijo vodnega kamna vplivata z magnetnim poljem. Izvedli smo eksperimente pri različnih variantah montaže elektromagneta in pri različnih obtokih vode skozi merilno progo. Dokazali smo, da se brez obdelave iz vode izloča kalcit, medtem ko se aragonit izloča v manjši meri. Po obdelavi z elektromagnetom in permanentnim magnetom pa se delež aragonita poveča. Pri tem zadostuje že par obtokov skozi napravo. Pomembna ugotovitev je, da se po obdelavi kemijska sestava vode in mikrobiološka slika ne spremenita.
Keywords: vodni kamen, trdota vode, magnetna obdelava vode, permanentni magnet, elektromagnet, pitna voda
Published: 04.12.2015; Views: 1809; Downloads: 279
.pdf Full text (4,49 MB)

5.
Determining losses and efficiency of axial flux permanent magnet synchronous motor
Peter Virtič, 2013, original scientific article

Abstract: This paper presents the method for determining losses and efficiency of small axial flux permanent magnet synchronous motor with surface mounted permanent magnets and double external rotor by using measurements. Losses and efficiency are calculated by using measured electrical input power and mechanical output power. The characteristics obtained by the measurements are in good agreement with analytically calculated results and the results obtained by the finite element method.
Keywords: losses, efficiency, axial flux permanent magnet synchronous motor, measurement
Published: 10.07.2015; Views: 1316; Downloads: 74
URL Link to full text

6.
Analysis of rotor disc thickness in coreless stator axial flux permanent magnet synchronous machine
Peter Virtič, 2012, original scientific article

Abstract: This paper presents the analysis of rotor disc thickness in coreless stator axial flux permanent magnet synchronous machine (AFPMSM) with double external rotor and internal stator. An important advantage of these types of machines is that rotors can be implemented by using massive ordinary construction steel. Due to the high possibility of large weight of AFPMSMs there is a tendency to implement as lightweight design as possible. In this work, the influence of rotor disk thickness on AFPMSM characteristics is investigated.
Keywords: axial flux, permanent magnet, synchronous machine, rotor thickness
Published: 10.07.2015; Views: 1823; Downloads: 70
URL Link to full text

7.
APPLYING THE GRAIN-BOUNDARY DIFFUSION PROCESS USING ELECTROPHORETIC DEPOSITION TO SELECTED REGIONS OF A Nd-Fe-B MAGNET
Blaž Goričar, 2014, master's thesis

Abstract: This Master's thesis research is about the localized coercivity enhancement of Nd-Fe-B magnets, which are used in electric motors. Computer simulations show, that when magnets operate at high temperatures, they experience large demagnetizing fields. However, this happens only on specific parts of the body of the magnet. The demagnetization can be prevented by locally enhancing the coercivity only on these specific parts. The goal of this Master’s thesis was to research the localized coercivity enhancement by creating a magnet, where one half would have different magnetic properties compared to the other half. Commercially available Nd-Fe-B magnets were bought from Shin-Etsu, Japan. The magnetic properties of the magnets were measured on two very different devices – the permeameter and the vibrating sample magnetometer. The demagnetization curves were compared. The coercivity of the magnet was improved with the electrophoretic deposition of dysprosium on the surface. The dysprosium then diffused, at high temperature, from the surface to the inside of the magnet along the grain boundaries. The microstructure of the magnet was analysed on the scanning electron microscope, while the content of the elements was quantitatively analysed with the EDS method. The demagnetization curves of both devices were comparable. The grain-boundary diffusion process of dysprosium with the electrophoretic deposition increased the coercivity of the magnet by 25 %, without any significant loss in remanence. The research on the localized grain-boundary diffusion was first done with measurements on the vibrating sample magnetometer and then confirmed with the Hall probe. We discovered that one part of the magnet could have different magnetic properties compared to the other half. There was a clear border between the two.
Keywords: Nd-Fe-B magnet, coercivity, magnetic properties, electrophoretic deposition, grain-boundary diffusion process.
Published: 09.09.2014; Views: 1640; Downloads: 94
.pdf Full text (4,38 MB)

8.
Optimizacija procesa izdelave senzorja za avtomobilsko industrijo
Josip Pejić, 2011, undergraduate thesis

Abstract: Diplomsko delo obravnava specifične probleme pri izdelavi senzorjev. Ker je kupec sprožil reklamacijo, in sicer s tezo, da naj bi prenehanje vrtenja ležaja v končnem sestavu povzročilo izhlapevanje aktivatorja kot komponente pri tehnologiji lepljenja, smo bili prisiljeni spremeniti interni proces. Na podlagi zahtev internega procesa in predhodnih testiranj smo izbrali peskanje kot dodatno tehnologijo. Novo izbrano tehnologijo je bilo potrebno najprej implementirati ter ob sprostitvi delovnega mesta tudi validirati. Z uvedbo optimizacije peskanja smo pridobili tako na ponovljivosti in stabilnosti kot tudi racionalizaciji. Po neuspeli optimizaciji tehnologije lepljenja, ki je zaradi nestabilnosti botrovala nedopustno velikemu odstotku izmeta in je povezana s predhodno tehnologijo peskanja, smo slednjo nadgradili z inovativno rešitvijo, in sicer z bakrom v prašni obliki kot dodatek k peskalnem mediju.
Keywords: izdelava senzorja, lepljenje, peskanje, implementacija, validacija, optimizacija, magnet, baker
Published: 14.09.2011; Views: 1691; Downloads: 161
.pdf Full text (2,70 MB)

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