Blar i Institutt for elkraftteknikk på forfatter "Nilssen, Robert"
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Electromagnetic field calculation and power loss evaluation in power transformers - Analysis of Leakage Fields and Stray Losses under Special Operation Conditions
Wang, Wei (Doctoral theses at NTNU;2022:395, Doctoral thesis, 2022)The PhD research work presented in this thesis deals with electromagnetic field calculation and loss evaluation in power transformers under special operation conditions. The special loading conditions under investigation ... -
Energy Efficient Motor for Shell Eco-Marathon: Ironless axial flux permanent magnet synchronous machine for the Shell Eco-Marathon competition
Dahl-Jacobsen, André (Master thesis, 2010)A new electric motor was designed for the DNV FuelFighter electric vehicle in co-operation with the Trondheim based company Smart Motor and NTNU. The machine is an ironless axial flux permanent magnet synchronous motor ... -
Forenklet elektrisk brems for vannkraftverk ved åpen statormetodikk
Aamodt, Henrik Smestad; Borchgrevink, Sondre Eide; Hustoft, Hallvard (Bachelor thesis, 2022)I 2021 publiserte Statnett en nasjonal veileder (NVF), denne stiller krav om synkrone produksjonsenheters funksjonalitet samt hvordan kravene kan oppfylles. Flere eldre vannkraftverk har ingen bremsesystemer installert og ... -
Fourier-based effective permeability for transformer iron losses computation under saturation
Wang, Wei; Nysveen, Arne; Magnusson, Niklas; Nilssen, Robert (Journal article; Peer reviewed, 2020)Computation of iron losses in transformers requires significant numerical efforts, particularly under magnetic saturation when the magnetic non-linearity needs to be considered. This study proposes a Fourier method to ... -
Frekvensomformerdrift av Fluks Vekslende Permanent Magnet Maskin FSPM: Motorkonstruksjon, kontrollsystem og driftstest.
Bolsøy, Bernhard Mikal (Master thesis, 2009)Det har i denne rapporten blitt presentert teknologi bak en FSPM maskin som er blitt testet i motordrift ved bruk av frekvensomformer. Kontrollsystemet som er benyttet er et Direkte Moment Kontroll System og er blitt ... -
Gearing as a part of an Electric Machine Functionally - Study and optimization of a partitioned stator switched flux permanent magnet machine
Fjellanger, Johan Nicolai (Master thesis, 2017)The idea to couple a gear magnetically has been around for some time, and has gained increased interest in recent years. By manipulating air gap field harmonics, magnetic gearing has been shown to have comparative, or even ... -
Generator design for vertical axis wind turbine
Schüller, Espen Samuelsen (Master thesis, 2010)The optimization process for generators are often done for rated speeds and torques. This thesis will discuss and show optimization of a vertical axis wind turbine generator that has a given wind profile. Although the rated ... -
Improved Version of Energy Efficient Motor for Shell Eco Marathon: Half Weight with Higher Efficiency
Nasrin, Lubna (Master thesis, 2011)The goal of the thesis is to analyze an existing Axial Flux Permanent Magnet motor used for Shell Eco Marathon from the Norwegian University of Science and Technology (NTNU). The existing machine has been analysed and ... -
Inductor application for teaching purposes
Minothi, Siri Schüller (Master thesis, 2021)For å muliggjøre læring gjennom prøving og feiling, et forenklet brukergrensesnitt for COMSOL Multiphysics er laget, kalt Inductor Analysis Application (IAA). Uten inngående kunnskap om COMSOL, skal studenten kunne simulere ... -
Investigating the Potential of Two Large Diameter Magnetic Bearings
Noddeland, Nils Børge Vaale; Røkke, Astrid (Master thesis, 2007)MAGNETIC bearings for large diameters and low rotational speeds are rarely developed and utilized due to poor competitive ability. They require little maintenance and offer high reliability, but until now mechanical bearings ... -
Investigation of Cogging Torque of a Downhole Drilling Machine and Optimization of Electrical Machine
Ullah, Aasim (Master thesis, 2012)This paper is a report on master thesis project conducted in cooperation with SMARTMOTOR AS and NTNU. The research for electrical downhole drilling machine has developed for decades. Permanent Magnet is a new addition in ... -
Investigation of Interior Permanent Magnet Machines with Concentrated Windings for High Dynamics Applications
Svihus, Christian (Master thesis, 2015)Interior permanent magnet (IPM) machines and non-overlapping concentrated windings (CW) are two design philosophies that have grown in popularity over the last decade. This is due to the many benefits and flexibility they ... -
Investigation of Loss Calculation Methods for PMSMs and Implementation of Loss Functionality on a Developed FEM Model
Leivsdottir, Vera (Master thesis, 2016)Accurate estimation of losses is one of the major challenges in electromagnetic machinery modelling. Where permanent magnet synchronous machines are attractive for high performance applications, making them relevant for ... -
Investigation of Permanent Magnet Machines for Downhole Applications: _ Design, Prototype and Testing of a Flux-Switching Permanent Magnet Machine
Chen, Anyuan (Doctoral Theses at NTNU, 1503-8181; 2011:23, Doctoral thesis, 2011)The current standard electrical downhole machine is the induction machine which is relatively inefficient. Permanent magnet (PM) machines, having higher efficiencies, higher torque densities and smaller volumes, have widely ... -
Loss Analysis in Laminated Iron Cores using COMSOL Multiphysics and LiveLink for Matlab
Westad, Sondre Hamarheim (Master thesis, 2018)A framework for loss analysis using COMSOL and LiveLink for Matlab is presented in this thesis. The loss analysis is based on Steinmetz' theory on iron core losses. IEC standard 60404-8-4:2013 gives a method of presenting ... -
Loss Calculations on Roebel-bars using Finite Element Analysis
Bergene, Jarle (Master thesis, 2008)This thesis concern 3D modeling and loss calculations on roebel-bars. The finite element program ANSYS has been used to do loss calculations on transposed as well as on untransposed conductors in order to investigate how ... -
Magnetic Modelling of Saturated IPMSMs, for Improved Torque Estimation and Accurate MTPA Control
Klyve, Øyvind Sommer (Master thesis, 2021)En utfordring for å oppnå optimal kontroll av synkronmotorer med nedgravde permanentmagneter, er å utvikle nøyaktige magnetiske modeller som beskriver forholdet mellom de påførte strømmene og de resulterende fluksforslygningene ... -
Marine Current Turbines and Generator preference. A technology review
Røkke, Astrid; Nilssen, Robert (Journal article; Peer reviewed, 2013)Marine current power is a significant energy resource yet to be exploited for electricity production. Several novel turbine technologies can be found on the market, and new ones emerge every year. This study found that the ... -
Modeling of electric shaft used by the company Inpower AS
Utkin, Mikhail (Master thesis, 2015)The master thesis is a further investigation of the steady state performance of the direct connection of the permanent magnet generators and motors, used for the ship propulsion; as proposed in the specializing project ... -
Multiphysics 3D Modelling of Ironless Permanent Magnet Generators
Zhang, Zhaoqiang; Muyeen, S.M.; Al-Durra, Abel A.; Nilssen, Robert; Nysveen, Arne (Journal article; Peer reviewed, 2014)Abstract Analytical method is widely used for the preliminary design and optimization of electrical machines. It has short calculation time and low computational cost (cost of simulation codes and supporting hardware), but ...