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1.
The dose–response relationship of quercetin on the motor unit firing patterns and contractile properties of muscle in men and women
Kohei Watanabe, Shun Kunugi, Aleš Holobar, 2023, izvirni znanstveni članek

Opis: Quercetin is one type of ergogenic aid and its effects on the neuromuscular system have recently attracted interest, but its dose-effect is not yet fully understood. The aim of this study was to examine the effect of different doses of quercetin ingestion on motor unit firing patterns and muscle contractile properties in humans. Thirteen young males and females conducted neuromuscular performance tests before (PRE) and 60 min after (POST) ingestions of 500 or 200 mg of quercetin glycosides (Qg500/Qg200, respectively) or placebo (PLA) on three different days. At PRE and POST, motor unit firing rates were calculated from high-density surface electromyography of the vastus lateralis muscle during 120-s isometric contraction of knee extension at 10% of maximal voluntary contraction. Electrically elicited forces in knee extensor muscles were also measured. After 60 s of voluntary contraction, motor unit firing rates, normalized by the exerted muscle force at POST, were significantly lower at POST than PRE with Qg500 and Qg200 (p < 0.05), but not with PLA (p > 0.05). Changes in motor unit firing rates normalized by the exerted force from PRE to POST were significantly greater with Qg500 than Qg200 at the end of contraction (p < 0.05). Under all three conditions, the electrically elicited force did not significantly change from PRE to POST (p > 0.05). These results suggest that both 500 and 200-mg quercetin ingestions alter motor unit firing patterns, and that quercetin’s effect is at least partially dose-dependent.
Ključne besede: ergogenic aids, nutritional supplementation, multichannel surface electromyography, motor unit identification, quercetin
Objavljeno v DKUM: 09.02.2024; Ogledov: 70; Prenosov: 2
.pdf Celotno besedilo (1,14 MB)
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2.
Tester preverjanja kota stikal, vezja AVD
Luka Barković, 2024, magistrsko delo

Opis: V magistrskem delu je razvita testirna naprava, ki ima možnost preverjanja položaja prispajkanih stikal na vezju AVD in odkrivanja slabih kosov. Za preverjanje položaja je uporabljen koračni motor, kateremu se štejejo koraki, ki se potem preračunajo v stopinje zaradi prikaza na zaslonu. Na osnovi števila korakov pri proženju stikal se določi odstopanje položaja stikal od željene vrednosti. Testirna naprava je narejena kot prototip na 3D-tiskalniku. Zagotovljen je zelo enostaven postopek testiranja, pri čemer se od uporabnika pričakuje zamenjava vezja po opravljenem testiranju in pritisk tipke za zagon testa.
Ključne besede: tester, krmilnik, koračni motor, kot, odstopanje
Objavljeno v DKUM: 06.02.2024; Ogledov: 73; Prenosov: 8
.pdf Celotno besedilo (5,25 MB)

3.
Assessment of the operating characteristics of brushless dc motors
Vasilija Sarac, Neven Trajchevski, Roman Golubovski, 2019, izvirni znanstveni članek

Opis: This paper presents the operating characteristics of brushless DC motors (BLDC) obtained via analytical, numerical, and simulation software, enabling steady-state and transient characteristics of a motor to be computed. Based on the catalogue data from the producer, Moog, a motor is simulated in a closed-loop control system fed by a voltage inverter. The accuracy of the derived models is verified by comparison with data from the producer. The developed analytical and simulation models enable the studying of various motor operating modes, such as no-load, rated load, and locked rotor, including motor starting characteristics. They are universal and can be easily applied to any brushless DC motor by simple replacement of the motor parameters. A numerical model in FEM software verifies the accuracy of previously derived models by obtaining the motor operating characteristics and the magnetic flux density distribution in a cross-section of the motor. The results obtained from all models have verified the proper design of the motor and laid out the path for further improvement with respect to the various motor parameters or operating characteristics.
Ključne besede: brushless DC motor, FEM model, transient characteristics
Objavljeno v DKUM: 22.12.2023; Ogledov: 348; Prenosov: 4
.pdf Celotno besedilo (663,25 KB)
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4.
Optimizacija vodenja dveh elastično sklopljenih asinhronskih motorjev : magistrsko delo
Max Klančar, 2023, magistrsko delo

Opis: Osrednji cilj magistrske naloge je eliminirati nihanje hitrosti v sistemu dveh elastično sklopljenih asinhronskih motorjev. Z izdelavo simulacije v programskem okolju OpenModelica sta prikazana delovanje in obnašanje opazovanega sistema. V sklopu naloge je bila izdelana električna vezalna shema. S pomočjo internih blokov v podjetju je bil izdelan program za vodenje motorjev v različnih konfiguracijah. Rezultati so predstavljeni v obliki slik in razloženi s pomočjo komentarjev.
Ključne besede: simulacija, vodenje pogonov, asinhronski motor, programljivi logični krmilnik, TIA portal, OpenModelica, MATLAB
Objavljeno v DKUM: 21.12.2023; Ogledov: 209; Prenosov: 12
.pdf Celotno besedilo (3,62 MB)

5.
Response surface method-based optimization of outer rotor permanent magnet synchronous motor
Vahid Rafiee, Jawad Faiz, 2019, izvirni znanstveni članek

Opis: The Finite Element Method (FEM) is a prominent analysis approach. Although it is applicable for simulation and optimization of electrical machines, FEM is a very time-consuming technique. One of the approaches to shorten the optimization runtime is the use of surrogate models instead of FEM. In this paper, the design and optimization of an outer rotor permanent magnet synchronous motor for a hybrid vehicle are investigated. Response surface methodology (RSM) with four input variables is integrated with a sequential quadratic programming algorithm for optimization. Before the optimization, the performance of the surrogate model in the prediction of untried points is validated. Finally, the optimal motor is simulated by FEM to verify the results of RSM-based optimization, and the outputs of both models are compared.
Ključne besede: response surface surrogate method, outer rotor permanent magnet synchronous motor, sequential quadratic programming optimization
Objavljeno v DKUM: 05.12.2023; Ogledov: 274; Prenosov: 3
.pdf Celotno besedilo (683,42 KB)
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6.
Pantograph driven with a linear induction motor with adaptive fuzzy control
Costica Nituca, Gabriel Chiriac, 2019, izvirni znanstveni članek

Opis: This article presents an adaptive fuzzy control for a linear induction motor, which is used to control the vertical movement of a pantograph, which supplies an electric locomotive from a contact line. The system has the goal of eliminating all the discontinuity on the route, the resonance phenomenon, the separation of the pantograph head from the contact wire, and electric arches. The simulations demonstrate functional control of the pantograph driven with a linear induction motor system using fuzzy control techniques.
Ključne besede: linear induction motor, fuzzy control, locomotive pantograph, simulation
Objavljeno v DKUM: 05.12.2023; Ogledov: 107; Prenosov: 3
.pdf Celotno besedilo (1,04 MB)
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7.
Measurement System for Testing of Electric Drives in Electric Vehicles
Iztok Brinovar, Gregor Srpčič, Sebastijan Seme, Bojan Štumberger, Miralem Hadžiselimović, 2019, objavljeni znanstveni prispevek na konferenci

Opis: This paper deals with the implementation of a measurement system, capable of performing real-time data acquisition and control, and allows the performance analysis of electric drives used for electric vehicle propulsion. For applying the mechanical load on the shaft of the tested motor three different test bench configurations with different power and speed ranges can be used. The main objective of the measurement system is to perform routine performance tests and road simulation tests (in terms of driving cycles) of an electric drive. It provides a research environment for analysis, investigation and study of electric drives and control strategies.
Ključne besede: measurement system, test bench, electric machines, electric vehicles, permanent magnet synchronous motor
Objavljeno v DKUM: 04.12.2023; Ogledov: 197; Prenosov: 9
.pdf Celotno besedilo (18,06 MB)
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8.
Vpliv uporabe e-goriva na tokovne razmere v vbrizgalni šobi dizelskega motorja
Amin Marinšek Hussain, 2023, magistrsko delo

Opis: Namen magistrskega dela je ugotoviti vpliv e-goriva na tokovne razmere v vbrizgalni šobi dizelskega motorja. Alternativna goriva imajo drugačne lastnosti od konvencionalnega dizelskega goriva. Posledično lahko pričakujemo različno obnašanje goriva v vbrizgalni šobi. V magistrski nalogi so primerjana tri goriva. To so e-FT gorivo, My Renewable Diesel in konvencionalno dizelsko gorivo. Analiza toka goriva je bila izvedena s pomočjo programske opreme AVL FIRE, kjer so bile izvedene tri simulacije, za vsako gorivo posebej. Simulacija je bila omejena na enako geometrijo vbrizgalne šobe, enak potek dviga igle, enak obratovalni režim motorja, enak tlak vbrizgavanja in enak tlak znotraj zgorevalne komore. Po končanih simulacijah smo spoznali, da lastnosti goriva vplivajo na tokovne razmere in razvoj parne faze. Viskoznost in gostota sta tesno povezana z razvojem parne faze ter s pojavom kavitacije. Višja kot sta viskoznost in gostota goriva, manjša je možnost pojava kavitacije ter manj je parne faze. To pomeni, da manj viskozna goriva bolj kavitirajo v primerjavi bolj viskoznimi.
Ključne besede: e-goriva, dizelski motor, alternativna goriva, numerična simulacija, programski paket AVL FIRE
Objavljeno v DKUM: 29.11.2023; Ogledov: 172; Prenosov: 28
.pdf Celotno besedilo (1,98 MB)

9.
Measurements of the characteristics of an electric motor for an electric vehicle's drive
Klemen Srpčič, Gregor Srpčič, 2021, izvirni znanstveni članek

Opis: This paper aims to present the performance and measurement results of a load test performed on a brushless DC motor built into the wheel of a solar-powered vehicle. A brushless DC motor's theoretical background and operation are presented at the beginning of the paper. The article covers the technical specification of the solar-powered vehicle and the inbuilt brushless DC motor. The measurements were performed with the described equipment at the Institute of Energy Technology, Faculty of Energy Technology, University of Maribor. Due to the unique design of the measured electric motor, it was also necessary to make a special housing, which was intended for connecting the electric motor to the test bench. The article concludes with an analysis of the measurement results in comparison with the data provided by the electric motor manufacturer.
Ključne besede: electric vehicles, electric motor, brushless DC motor, solar-powered vehicle
Objavljeno v DKUM: 13.11.2023; Ogledov: 222; Prenosov: 9
.pdf Celotno besedilo (2,44 MB)
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10.
Experimental verification of the numerically determined parameters for the non-linear two-axis model of a synchronous motor with interior permanent magnets
Željko Hederić, Venco Ćorluka, Toni Varga, 2021, izvirni znanstveni članek

Opis: Synchronous machines belong to the family of electrical machines characterised by a synchronous magnetic rotating field in the air gap of the machine, the speed of which depends on the frequency of the currents in the armature winding. The paper presents procedures and methods for the numerical determination and experimental verification of the parameters for a nonlinear two-axis model of a synchronous motor with permanent magnets in the rotor (IPMSM) and a concentrated stator winding. To calculate the distribution of electro-magnetic fields in the motor accurately, models with distributed parameters are used in motor design, for which the Finite Element Method (FEM) is usually employed. The improvement by using the model with concentrated parameters considerably simplifies the physical model, by describing it with a system of (non)linear differential equations, the so‐called partial differential equations, which is presented in this paper.
Ključne besede: synchronous motor, flux linkage, interior permanent magnets, non-linear
Objavljeno v DKUM: 13.11.2023; Ogledov: 115; Prenosov: 3
.pdf Celotno besedilo (1,24 MB)
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