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  • 1. Carlsson, Fredrik
    et al.
    Soulard, Juliette
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Grop, Henrik
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Free Fall Attraction as a Practical and Theoretical Project in the Electrical Engineering Education2006Conference paper (Refereed)
    Abstract [en]

    In the first year of the studies in the five-yearMaster of Science programme in Electrical Engineering at KTH,there is a course named “Electro project”. The students that takethis compulsory course choose between several projects and thispaper describes a newly invented project called Free Fall, whichpractically and theoretically demonstrates in a simple andinteresting way important electrical engineering equations forthe students. The students study, calculate and build a gondolathat first accelerates when it falls freely along a tower from itstop and then decelerate with eddy current brakes. The studentslearn apart from modelling of physical phenomena, mechanicalconstruction, validation, measurements and collaboration withinthe group as well as with the laboratory staff.

  • 2.
    Grop, Henrik
    KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics.
    Investigation of AC electrical machine stators with fractional conductor windings2010Licentiate thesis, monograph (Other academic)
    Abstract [en]

    Industry always searches the least expensive solution for a machine design. Therefore, there is a need for integrating different customer ordered machines within the same frame, while keeping the foundation of the mechanical design constant. Since the winding design in electrical machines is essential for the performance and relatively inexpensive to adapt, it can be used to meet different customer demands. This thesis investigates the foundations of a special winding named fractional conductor winding. An expression for winding factors for certain kinds of these windings is developed. Calculations showed that the selection of the winding distribution has effect on the air gap space harmonics produced by the winding. In some cases, the fifth and seventh space harmonics can be eliminated by the use of fractional conductor windings in combination with short pitching. The construction of a prototype fractional conductor wound induction motor was documented and is presented in this thesis. The air gap flux density in a dual slotted fractional conductor wound induction motor running at no load is studied. Analytical models are compared to results obtained by finite elements and measurements. It was found that analytical results overestimated the peak of the fundamental flux density by 13.5%. The overestimation was caused by the iron reluctance of the main flux path as well as saturation. Leakage was found to be a minor cause of this overestimation. Slot leakage and differential leakage in machines having these windings are studied. The analytical models were evaluated, with mostly good agreements, compared to finite element modeling as well as measurements.

  • 3.
    Grop, Henrik
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Soulard, Juliette
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Krings, Andreas
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Persson, Holger
    Semi-analytical modeling of the end-winding self-inductance in large AC machines2012In: Proceedings of the 15th International Conference on Electrical Machines and Systems (ICEMS), Institution of Electrical Engineers of Japan (IEEJ), 2012, p. 6401782-Conference paper (Refereed)
    Abstract [en]

    A semi-analytical model for calculation of self-inductance of complex coil geometries having a rectangular cross-section (form-wound coils) is proposed and evaluated. A step-by-step validation is carried on using both 2D-FEM simulations and measurements on a coil placed in air. A second version of the model is developed, to speed up the computation time through removing the possibility to analyze the contribution of the internal flux in the conductor. The predicted value of the self-inductance of a diamond-shaped coil placed in air is within 5% of the measured value.

  • 4.
    Grop, Henrik
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics.
    Soulard, Juliette
    KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics.
    Persson, H.
    Stator Slot Leakage in AC-Machines Equipped With Fractional Conductor Windings2009In: 2009 INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS, 2009, p. 168-173Conference paper (Refereed)
    Abstract [en]

    This paper presents a slot leakage model for stator windings having a fractional number of turns per slot. The results are compared with finite element simulations and measurements using search coils in a prototype machine. Although the slot leakage model predicts the leakage correctly in the slot bottom, the model cannot be used on its own for the slot top since the zig-zag leakage was very pronounced just below the slot wedge.

  • 5.
    Grop, Henrik
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics (closed 20110930).
    Soulard, Juliette
    KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics (closed 20110930).
    Persson, Holger
    Theoretical Investigation of Fractional Conductor Windings for AC-Machines: Definition, Air-gap m.m.f. and Winding Factors2008In: ICEM: 2008 International Conference on Electrical Machines, NEW YORK: IEEE , 2008, p. 529-534Conference paper (Refereed)
    Abstract [en]

    This paper introduces the concept of fractional conductor windings for AC-machines. They allow to obtain fractional equivalent number of conductors per slot. Different arrangements of windings are presented. The harmonic spectrum of the armature magneto-motive force in the air-gap is then analyzed in order to derive rules for choosing suitable combinations using winding factors.

  • 6.
    Grop, Henrik
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Soulard, Juliette
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Persson, Holger
    Savinovic, Gjordje
    Bergman, Leif
    End-Winding Inductances for Synchronous Machines in the MVA-Range with Fractional Conductor Windings2011In: Proceeding of Portuguese-Spanish Conference on Electrical Engineering, 2011Conference paper (Other academic)
  • 7.
    Krings, Andreas
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Nategh, Shafigh
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Stening, Alexander
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Grop, Henrik
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Soulard, Juliette
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Measurement and Modeling of Iron Losses in Electrical Machines (Invited Paper)2012In: Proceedings of the 5th International Conference Magnetism and Metallurgy WMM'12, Gent, Belgium: Gent University , 2012, p. 101-119Conference paper (Other academic)
    Abstract [en]

    This paper gives an overview of nowadays used simulation models and measurement methods in order to determine iron losses in electrical machinery. The paper provides machine designers and system engineers with an overview of suitable iron loss models applicable for the machine design process and simulations. Furthermore, possible methods for iron loss measurements in electrical machines are presented from ongoing research projects. Besides standard electrical power measurements, iron losses are determined by thermal and magnetic property measurements, taking into account different IEC and IEEE standards.The goal is to emphasize the different possibilities of iron loss measurement methods and possible application areas for electrical machinery.

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