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1.
Analysis of rotor disc thickness in coreless stator axial flux permanent magnet synchronous machine
Peter Virtič, 2012, izvirni znanstveni članek

Opis: 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.
Ključne besede: axial flux, permanent magnet, synchronous machine, rotor thickness
Objavljeno: 10.07.2015; Ogledov: 1171; Prenosov: 54
URL Povezava na celotno besedilo

2.
Determining losses and efficiency of axial flux permanent magnet synchronous motor
Peter Virtič, 2013, izvirni znanstveni članek

Opis: 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.
Ključne besede: losses, efficiency, axial flux permanent magnet synchronous motor, measurement
Objavljeno: 10.07.2015; Ogledov: 767; Prenosov: 52
URL Povezava na celotno besedilo

3.
IZRAČUN MAGNETNIH RAZMER V MERILNIKU MAGNETNIH LASTNOSTI MATERIALOV S PROGRAMOM FLUX
Aleš Anošek, 2015, diplomsko delo

Opis: Diplomska naloga temelji na modeliranju merilnika magnetnih lastnosti, katerega smo modelirali v dveh programih AutoCAD in Flux 11.2. Najprej smo si pridobili znanje iz reševanje problema elektromagnetnega polja in metodi končnih elementov (MKE). Zatem preučili merilec lastnosti magnetne pločevine z okroglim vzorcem in se lotili modeliranja. Slednje je imelo poudarek na programu Flux, v katerem smo model naredili in izvršili izračun magnetnih razmer v vzorcu le-tega. Izvedli smo štiri različne izračune in analizirali pridobljene rezultate.
Ključne besede: modeliranje, merilnik magnetnih lastnosti, program Flux, MKE
Objavljeno: 28.09.2015; Ogledov: 427; Prenosov: 72
.pdf Celotno besedilo (5,41 MB)

4.
ANALIZA MAGNETNIH RAZMER SINHRONSKEGA STROJA
Jure Prelogar, 2015, diplomsko delo

Opis: Namen diplomskega dela je analiza magnetnih razmer sinhronskega stroja s poudarkom na izračunu momenta. Na začetku je opisano nekaj teorije, potrebne za razumevanje diplomske naloge. V programu Flux smo modelirali sinhronski motor in preučili magnetne razmere. Za konec smo izračunali še magnetni moment za nekaj različnih tokov. Vse slike, tabele in rezultati so predstavljeni v diplomskem delu.
Ključne besede: Flux, sinhronski motorji, magnetno polje
Objavljeno: 14.10.2015; Ogledov: 458; Prenosov: 68
.pdf Celotno besedilo (2,57 MB)

5.
Contribution of non-troglobiotic terrestrial invertebrates to carbon input in hypogean habitats
Tone Novak, Franc Janžekovič, Saška Lipovšek Delakorda, 2013, izvirni znanstveni članek

Opis: Eleven of the most important terrestrial invertebrate species in Slovenian caves were analyzed for differences in their fresh and dry biomass, energy content and carbon bulk during winter. These data were combined with the species abundance in 54 caves and adits in order to estimate their organic carbon bulk and carbon input into these habitats. In Central European caves, Troglophilus cavicola, T. neglectus, Faustina illyrica, Amilenus aurantiacus and Scoliopteryx libatrix are the most important vectors of carbon between the epigean and hypogean habitats. In contrast to the general assumption, carbon total contribution to caves via dead bodies is only 0.15% of total migratory biomass, and it is not directly available to troglobionts because of infection with entomopathogenic fungi. In winter, together with predated migratory specimens, carbon input does not exceed 0.3% of the total migratory biomass. This situation should be carefully examined in every karstic region inhabited by distinctive fauna.
Ključne besede: biomass, carbon flux, caves, non-troglobiotic species, organic carbon, respiration
Objavljeno: 21.12.2015; Ogledov: 574; Prenosov: 51
URL Povezava na celotno besedilo

6.
Modeliranje transformatorja z metodo končnih elementov
Marko Volčič, 2016, diplomsko delo

Opis: Diplomska naloga temelji na modeliranju transformatorja s programom Cedrat Flux 3D, verzija 12. Najprej smo spoznali osnovno teorijo in obratovalna stanja transformatorja, sledilo je spoznavanje obravnavanega transformatorja, katerega smo uporabili za model. Nato smo v programu Flux 3D sestavili model in simulirali obratovalna stanja transformatorja in rezultate primerjali z izmerjenimi.
Ključne besede: Transformator, program Flux, obratovalna stanja transformatorja
Objavljeno: 28.09.2016; Ogledov: 337; Prenosov: 51
.pdf Celotno besedilo (5,95 MB)

7.
Modeliranje univerzalnega motorja in izračun vrtilnega momenta
Sandra Iljaš, 2016, delo diplomskega projekta/projektno delo

Opis: V projektnem delu smo najprej predstavili univerzalni motor, ter njegove specifikacije. Njegovo konstrukcijo smo nato načrtovali v programu AutoCAD. Končana modela rotorja in statorja smo prenesli v program Flux z namenom, da izračunamo vrtilni moment in prikažemo potek in gostoto magnetnega polja pri različnih položajih rotorja. Rezultati magnetnega polja so prikazani slikovno, vrednosti vrtilnega momenta pa so prikazane grafično in tabelarično. Izvedena je tudi primerjava vrednosti maksimalnega vrtilnega momenta pri maksimalnem in polovičnem nazivnem toku.
Ključne besede: univerzalni motorji, vrtilni moment, AutoCAD, Flux
Objavljeno: 12.05.2017; Ogledov: 1000; Prenosov: 110
.pdf Celotno besedilo (2,51 MB)

8.
Chiral four-dimensional F-theory compactifications with SU(5) and multiple U(1)-factors
Mirjam Cvetič, Antonella Grassi, Denis Klevers, Hernan Piragua, 2014, izvirni znanstveni članek

Opis: We develop geometric techniques to determine the spectrum and the chiral indices of matter multiplets for four-dimensional F-theory compactifications on elliptic Calabi-Yau fourfolds with rank two Mordell-Weil group. The general elliptic fiber is the Calabi-Yau onefold in dP(2). We classify its resolved elliptic fibrations over a general base B. The study of singularities of these fibrations leads to explicit matter representations, that we determine both for U(1) xU(1) and SU(5) x U(1) x U(1) constructions. We determine for the first time certain matter curves and surfaces using techniques involving prime ideals. The vertical cohomology ring of these fourfolds is calculated for both cases and general formulas for the Euler numbers are derived. Explicit calculations are presented for a specific base B = P-3. We determine the general G(4)-flux that belongs to H-V((2,2)) of the resolved Calabi-Yau fourfolds. As a by-product, we derive for the first time all conditions on G(4)-flux in general F-theory compactifications with a non-holomorphic zero section. These conditions have to be formulated after a circle reduction in terms of Chern-Simons terms on the 3D Coulomb branch and invoke M-theory/F-theory duality. New ChernSimons terms are generated by Kaluza-Klein states of the circle compactification. We explicitly perform the relevant field theory computations, that yield non-vanishing results precisely for fourfolds with a non-holomorphic zero section. Taking into account the new Chern-Simons terms, all 4D matter chiralities are determined via 3D M-theory/F-theory duality. We independently check these chiralities using the subset of matter surfaces we determined. The presented techniques are general and do not rely on toric data.
Ključne besede: flux compactifications, F-theory
Objavljeno: 27.06.2017; Ogledov: 250; Prenosov: 232
.pdf Celotno besedilo (1,75 MB)
Gradivo ima več datotek! Več...

9.
Elliptic fibrations with rank three Mordell-Weilgroup
Mirjam Cvetič, Denis Klevers, Hernan Piragua, Peng Song, 2014, izvirni znanstveni članek

Opis: We analyze general F-theory compactifications with U(1)xU(1)xU(1) Abelian gauge symmetry by constructing the general elliptically fibered Calabi-Yau manifolds with a rank three Mordell-Weil group of rational sections. The general elliptic fiber is shown to be a complete intersection of two non-generic quadrics in P-3 and resolved elliptic fibrations are obtained by embedding the fiber as the generic Calabi-Yau complete intersection into Bl(3)P(3), the blow-up of P-3 at three points. For a fixed base B, there are finitely many Calabi-Yau elliptic fibrations. Thus, F-theory compactifications on these Calabi-Yau manifolds are shown to be labeled by integral points in reflexive polytopes constructed from the nef-partition of Bl(3)P(3). We determine all 14 massless matter representations to six and four dimensions by an explicit study of the codimension two singularities of the elliptic fibration. We obtain three matter representations charged under all three U(1)-factors, most notably a tri-fundamental representation. The existence of these representations, which are not present in generic perturbative Type II compactifications, signifies an intriguing universal structure of codimension two singularities of the elliptic fibrations with higher rank Mordell-Weil groups. We also compute explicitly the corresponding 14 multiplicities of massless hypermultiplets of a six-dimensional F-theory compactification for a general base B.
Ključne besede: flux compactifications, F-theory, superstring vacua, D-branes
Objavljeno: 27.06.2017; Ogledov: 281; Prenosov: 64
.pdf Celotno besedilo (840,88 KB)
Gradivo ima več datotek! Več...

10.
Modeliranje elektromagnetnega aktuatorja in izračun sile na pomični del
Tadej Sel, 2017, delo diplomskega projekta/projektno delo

Opis: V projektnem delu smo opisali delovanje linearnega elektromagnetnega aktuatorja, v nadaljevanju pa smo predstavili postopek računalniškega modeliranja dejanskega aktuatorja v programskem paketu Flux 3D. Opravili smo simulacijske izračune v šestih pozicijah armature aktuatorja. Rezultati numeričnega izračuna so grafično prikazani s smermi gostote magnetnega pretoka v 3D modelu in z barvnim prikazom porazdelitve gostote magnetnega pretoka v 2D prerezu. Preverili smo obremenjenost materiala in izračunali silo, s katero armatura aktuatorja v različnih pozicijah deluje na strojni element.
Ključne besede: računalniško modeliranje, elektromagnetni aktuator, Flux 3D
Objavljeno: 02.10.2017; Ogledov: 659; Prenosov: 68
.pdf Celotno besedilo (2,25 MB)

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