1. Merjenje karakteristik eksplozijsko varnega asinhronskega elektromotorja : diplomsko deloAndrej Drnovšek, 2023, undergraduate thesis Abstract: V industriji se zelo pogosto uporabljajo električni stroji in naprave, med katere sodijo tudi asinhronski elektromotorji. Težava nastane takrat, kadar se asinhronske elektromotorje potrebuje na tako imenovanih eksplozijsko nevarnih področjih. To so področja, kjer so prisotne koncentracije vnetljivih plinov ali tekočin in bi posledično lahko ob prisotnosti iskre, električnega toka ali visoke temperature prišlo do eksplozije. Ker ta področja industrije ne morejo obratovati brez asinhronskih elektromotorjev, se je v ta namen razvil poseben tip oziroma izvedba. Takšna izvedba se imenuje eksplozijsko varna, in ima lastnost, da tudi če bi zaradi katerega izmed zgoraj navedenih razlogov prišlo do eksplozije, se le-ta ne bi razširila v okolico. Ker je v današnjih časih potreba po eksplozijsko varnih asinhronskih elektromotorjih vse večja, je celotno diplomsko delo orientirano k njim. Natančneje cilj diplomskega dela je merjenje karakteristik eksplozijsko varnega asinhronskega elektromotorja, s poudarkom na merjenju izkoristka za razred IE3. Pri tem so bile opravljene meritve na prototipnem eksplozijsko varnem asinhronskem elektromotorju, v dveh različnih merilnicah. Predhodno je bil opravljen še analitični izračun z zato namenjeno programsko opremo. Povsem na koncu diplomskega dela pa je sledila še natančna analiza rezultatov, v smislu neposredne primerjave rezultatov iz obeh merilnic, z rezultati, dobljenimi s pomočjo analitičnega izračuna.
Keywords: asinhronski elektromotor, eksplozijska varnost, tipsko preizkušanje, analitični izračun
Published in DKUM: 18.01.2024; Views: 399; Downloads: 44
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2. Accuracy of Rotational Speed and Torque Sensors for Determining the Mechanical Power of Rotating Electrical MachinesGregor Srpčič, Iztok Brinovar, Bojan Štumberger, Sebastijan Seme, Miralem Hadžiselimović, 2019, published scientific conference contribution Abstract: This paper deals with determining the accuracy of measuring systems for determining the characteristics of rotating electrical machines. Efficiency classes and experimental methods for determining efficiency, are given in a standard, which has to be strictly respected. For determining the efficiency of an electrical machine, it is necessary to have a modern and accurate measurement system with sensors of high accuracy classes, which enables the user to carry out precise measurements and consequently, to determine all the characteristics of the electrical machine. This paper will be focused on torque and speed measurements.
Keywords: efficiency, measuring system, electric machines, torque and rotational sensors, accuracy
Published in DKUM: 04.12.2023; Views: 529; Downloads: 34
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3. Energy Efficiency Indicators of a Single Unit HouseIztok Brinovar, Gregor Srpčič, Zdravko Praunseis, Sebastijan Seme, Bojan Štumberger, Miralem Hadžiselimović, 2019, published scientific conference contribution Abstract: This article deals with the evaluation of energy efficiency indicators of an older single unit house with the use of "KI energija 2017" software, which is widely used among qualified Slovenian experts authorized to carry out the energy performance assessments and issue an energy performance certificate. The energy performance analysis before and after the implementation of proposed measures has shown significant energy saving potential in renovation of existing buildings.
Keywords: energy efficiency, energy indicators, energy performance, building renovation, CO2 emissions
Published in DKUM: 04.12.2023; Views: 488; Downloads: 36
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4. Estimation of the Solar Irradiance on Tilted Surface for Different Types of PyranometersSebastijan Seme, Klemen Sredenšek, Iztok Brinovar, Gregor Srpčič, Miralem Hadžiselimović, Bojan Štumberger, 2019, published scientific conference contribution Abstract: Accurate measurements of solar irradiance are important in many applications such as studying the distribution of received radiation or estimating the final yield of photovoltaic systems This paper deals with evaluation of different types of pyranometers. The primary objective of this paper is to compare two types of pyranometers, with the use of mathematical model for predicting solar radiation on incline surface. The mathematical model shows that both types of pyranometers receives the highest annual average solar radiation with a surface facing 189° south and inclination angle of 44°. The results in this paper show that the deviation between silicon photodiode and thermopile pyranometer mostly occur, due to irregular calibration, frequent cleaning and errors of silicon photodiode pyranometer under overcast sky conditions.
Keywords: pyranometer, solar radiation, azimuth angle, inclination angle, accuracy
Published in DKUM: 04.12.2023; Views: 392; Downloads: 37
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5. Measurement System for Testing of Electric Drives in Electric VehiclesIztok Brinovar, Gregor Srpčič, Sebastijan Seme, Bojan Štumberger, Miralem Hadžiselimović, 2019, published scientific conference contribution Abstract: 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.
Keywords: measurement system, test bench, electric machines, electric vehicles, permanent magnet synchronous motor
Published in DKUM: 04.12.2023; Views: 383; Downloads: 28
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6. SWOT Analysis of Pedelecs and E-Cars in Selected Countries of the Danube RegionGregor Srpčič, Iztok Brinovar, Katja Hanžič, Miralem Hadžiselimović, Sebastijan Seme, 2019, published scientific conference contribution Abstract: This paper deals with pedelecs and e-cars in urban transport systems in selected countries of the Danube region. Within the EU project eGUTS a feasibility study focused on pedelecs and e-cars was made. Country specific information on e-mobility (pedelecs and ecars) was gathered and is briefly presented in chapter 2. In addition, a common SWOT analysis for all selected countries of the Danube region was made and is presented in the conclusion of the paper.
Keywords: pedelecs, e-cars, electric vehicles, SWOT analysis, Danube region
Published in DKUM: 04.12.2023; Views: 416; Downloads: 37
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7. The Implementation of Electronic Green Public Procurement Tool in SloveniaKlemen Sredenšek, Gregor Srpčič, Maršenka Marksel, Miralem Hadžiselimović, Sebastijan Seme, 2019, published scientific conference contribution Abstract: This paper deals with implementation of electronic green public procurement tool for achieving environmental protection and sustainable development. The electronic green public procurement tool used within the living labs has been tested by stakeholders which proposed several valuable improvements. The evaluation analysis has shown that the living labs stakeholders knowledge on electronic green public procurement topics was improved.
Keywords: green public procurement, implement, improve, living lab, electronic green public procurement tool
Published in DKUM: 04.12.2023; Views: 406; Downloads: 28
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8. Measurements of the characteristics of an electric motor for an electric vehicle's driveKlemen Srpčič, Gregor Srpčič, 2021, original scientific article Abstract: 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.
Keywords: electric vehicles, electric motor, brushless DC motor, solar-powered vehicle
Published in DKUM: 13.11.2023; Views: 400; Downloads: 17
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9. Validation of the T6 temperature class for an explosion - proof induction motorGregor Srpčič, Miralem Hadžiselimović, Iztok Brinovar, Klemen Sredenšek, Sebastijan Seme, Bojan Štumberger, 2022, published scientific conference contribution abstract Keywords: induction motor, temperature class, over-load test, temperature rise test
Published in DKUM: 27.10.2023; Views: 410; Downloads: 6
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10. Future trends in photovoltaics : hybrid photovoltaic/thermal systemKlemen Sredenšek, Iztok Brinovar, Gregor Srpčič, Miralem Hadžiselimović, Bojan Štumberger, Amor Chowdhury, Sebastijan Seme, 2022, published scientific conference contribution abstract Keywords: hybrid photovoltaic/thermal system, photovoltaic system, heat pump, waste heat
Published in DKUM: 27.10.2023; Views: 451; Downloads: 13
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