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  • 1. Agheb, E.
    et al.
    Hashemi, E.
    Mousavi, Seyedali A.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Hoidalen, H. K.
    Study of very fast transient overvoltages in air-cored pulsed transformers2012In: Compel, ISSN 0332-1649, Vol. 31, no 2, p. 658-669Article in journal (Refereed)
    Abstract [en]

    Purpose - The purpose of this paper is to study very fast transient overvoltages (VFTOs) in the secondary winding of air-cored Tesla transformers and also study the resulting electric field stresses. Design/methodology/approach - An exhaustive model based on Multi-conductor Transmission Lines (MTLs) theory has been used. The governing telegraphist's equations have been solved by Finite Difference Time Domain (FDTD) method. Findings - The results demonstrated that there are some overvoltages at the end and middle turns that should be considered in insulation design. The magnitudes of these overvoltages are several times more than the steady state value of the corresponding turn which cause very high electric field stresses. Originality/value - The paper describes results obtained from an original and innovative implementation of FDTD method in transmission line modelling and is applied properly to air-cored pulse transformers.

  • 2.
    Soulard, Juliette
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics.
    Meier, Florence
    Design guidelines and models for PMSMs with non-overlapping concentrated windings2011In: Compel, ISSN 0332-1649, Vol. 30, no 1, p. 72-83Article in journal (Refereed)
    Abstract [en]

    Purpose - The purpose of this paper is to present a general review of design guidelines and analytical models for permanent-magnet synchronous machines (PMSMs) with non-overlapping concentrated windings, including the authors' own experience. Design/methodology/approach - The deign features specific to three-phase PMSMs with non-overlapping concentrated windings are presented following the proposed chronology for the different choices to be made by motor designers. Findings - It is shown that the selections of the stator core manufacturing method, the number of winding layers, the combination of pole and slot numbers, and the geometry of the tooth tips are crucial during the design stage of the machine. Comprehensive lists of references introducing useful analytical models and prototypes presented in literature are provided. Practical implications - By following the guidelines provided in the paper, motor designers are able to avoid the known drawbacks of PMSMs with non-overlapping concentrated windings, and have a ready list of sources describing useful analytical models. Originality/value - PMSMs with non-overlapping concentrated windings have recently been widely investigated. This paper provides an overview of the main results; pinpointing the choices encountered by the motor designers.

  • 3.
    Tavakoli, Hanif
    et al.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Bormann, Dierk
    Ribbenfjärd, David
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Engdahl, Göran
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Comparison of a simple and a detailed model of magnetic hysteresis with measurements on electrical steel2009In: Compel, ISSN 0332-1649, Vol. 28, no 3, p. 700-710Article in journal (Refereed)
    Abstract [en]

    Purpose - For efficient magnetic field calculations in electrical machines, the hysteresis and losses in laminated electrical steel must be modeled in a simple and reliable way. The purpose of this paper is to investigate and discuss the potential of a simple complex-permeability model. Design/methodology/approach - A frequency dependent complex-permeability model as well as a more detailed model (describing hysteresis, classical eddy current effects, and excess losses separately) are compared to single-sheet measurements on laminated electrical steel. It is discussed under which circumstances the simple complex-mu model is an adequate substitute for the more detailed model. Findings - A satisfactory agreement of the simple complex-mu model was found with both detailed model and measurements, improving with increasing frequencies. This is true not only for the effective permeability function, but holds also for the detailed H-B characteristics (hysteresis). Originality/value - It is demonstrated that the complex-A model is a reliable and convenient starting point for the estimation of flux distribution and losses in complicated magnetic core geometries.

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