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  • 1.
    Arshad, W. M.
    et al.
    KTH, Superseded Departments, Electrical Systems.
    Thelin, Peter
    KTH, Superseded Departments, Electrical Systems.
    Sadarangani, Chandur
    KTH, Superseded Departments, Electrical Systems.
    Bäckström, T.
    Analytical analysis and dimensioning of a low-leakage linear transverse-flux machine2004In: IEE Conference Publication, 2004, p. 414-419Conference paper (Refereed)
    Abstract [en]

    This paper presents a two-dimensional analytical analysis and dimensioning procedure of a novel low-leakage linear transverse-flux machine (TFM). The two-dimensionalanalytical models approximate the complex three-dimensional fluxes of the TFM. Theanalysis is based upon how the different airgap permeances and the non-linear iron reluctances in the different machine sections vary, as the translator is traversed through the airgap. The reluctance networks for the magnetomotive force (MMF) of the magnets and for the current dependent armature-MMF are solved simultaneously. A 5-kW proof-of-concept machine is dimensioned and its performance predicted using the described procedure. The different performance defining parameters are derived as continuous functions of the translator position. The dependence of the machine power factor and the force capability upon the current loading, which is quite interesting when analysing TFMs, is also investigated.

  • 2.
    Arshad, Waqas M.
    et al.
    KTH, School of Electrical Engineering (EES).
    Thelin, Peter
    KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics.
    Bäckström, T.
    Sadarangani, Chandur
    KTH, Superseded Departments, Electrical Systems.
    Use of transverse-flux machines in a free-piston generator2004In: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367, Vol. 40, no 4, p. 1092-1100Article in journal (Refereed)
    Abstract [en]

    This paper investigates the use of transverse-flux machines (TFMs) in a free-piston generator, an integration of a combustion engine and a linear electrical machine. For hybrid vehicles (the intended application), this integrated device has benefits in efficiency, emissions, reliability, etc. Conventional TFMs are dimensioned and their shortcomings illustrated. Several surface-mounted TFM designs are suggested. These designs, initially believed to be promising, are later discovered to be. poor during the three-dimensional finite-element method (3-D FEM) analysis. These designs suffered from a large axial pole-to-pole armature-flux leakage in the stator. This problem is solved in the proposed buried-magnets TFM variants, for which patents have been filed as well. A 5-kW proof-of-concept prototype of one such design is dimensioned that allowed the near fulfilment of 3-D FEM verifiable system demands. One phase. of this dimensioned three-phase prototype is built. Measurements on this,prototype showed that the use of short pole lengths in the machine had led to manufacturing defects. Nevertheless, the electromagnetic viability of the design could still be approximately verified.

  • 3.
    Arshad, Waqas Mahmood
    et al.
    KTH, Superseded Departments, Electrical Systems.
    Thelin, Peter
    KTH, Superseded Departments, Electrical Systems.
    Modelling of complex flux paths in a new high-performance transverse-flux electrical machine2004In: SECOND SEEHEIM CONFERENCE ON MAGNETISM, PROCEEDINGS / [ed] Ghafari, M; Enz, T; Hahn, H, WEINHEIM: WILEY-V C H VERLAG GMBH , 2004, p. 3227-3234Conference paper (Refereed)
    Abstract [en]

    The complex three-dimensional fluxes in a newly introduced high-performance transverse-flux electrical machine are investigated. The magnet-flux, the armature-flux and the combined-flux in the machine are studied as a function of mover position. Separate non-linear reluctance networks for the magnets- and current- magneto-motive forces are developed and solved simultaneously in an iterative manner. The airgap is modelled by defining two/three-dimensional varying permeances. The iron is represented with three different non-linear reluctances. The analytical models are fine tuned and verified by employing a detailed three-dimensional finite element analysis. The role these fluxes play in the determination of the machine's performance is also described. Lastly, it is shown how these fluxes help explain the machines' measured performance when unexpected manufacturing defects occurred.

  • 4.
    Cosic, Alija
    et al.
    KTH, Superseded Departments, Electrical Systems.
    Lindbäck, Jens
    Arshad, Waqas Mahmood
    KTH, Superseded Departments, Electrical Systems.
    Leksell, Mats
    KTH, School of Electrical Engineering (EES).
    Thelin, Peter
    Nordlund, Erik
    APPLICATION OF A FREE-PISTON GENERATOR IN A SERIES HYBRID VEHICLE2003In: Proceedings of the 4th international Symposium on Linear Drives for Industry Applications, 2003, p. 541-544Conference paper (Refereed)
    Abstract [en]

    This paper deals with an investigation of differentcontrol strategies for a series hybrid electric vehicle (SHEV).Another discussed issue is the application of a free-pistongenerator. By replacing a conventional combustion enginewith a free-piston generator it is possible to increase the totalefficiency of the system. The object of investigation is a12-ton truck, mainly used in urban areas. The drive systemhas been built up and simulated in a MATLAB Simulinkenvironment. It follows from the investigation that theapplication of a free-piston engine in a SEHV can increasethe efficiency by 25 percent compared to the conventionalengine.

  • 5.
    Sadarangani, Chandur
    et al.
    KTH, Superseded Departments, Electrical Systems.
    Arshad, Waqas
    KTH, Superseded Departments, Electrical Systems.
    Bäckström, Thomas
    Östlund, Stefan
    KTH, Superseded Departments, Electrical Systems.
    Arrangement Related to Seatbelts2001Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    The invention includes an arrangement related to seatbelts (1) adapted to a vehicle, having at all events two securing points (2a, 2b), intended for the belt, which points are related to a chassis (3a) belonging to the vehicle, at all events one of the securing points (2b) belonging to the belt consisting of a reel (40), drivable by an electric motor (4), in order to be able to reel belt sections or parts near the securing points (2d) thereon with an intention of being able to hold belt stretchings (2e, 2f) stretched against a person's chest and/or trunk portion or vice versa. One or more sensors are adapted to, at a value occurring above a selected limit value, let said electric motor (4) be activated to drive the reel (40) in a direction in order to increase the stretching force in said belt, and said electric motor consists of a polyphase motor. Said polyphase motor (4) is designed to present a low electric inductance and/or a high torque density, in order to thereby be able to provide a relatively high starting torque, high torque and endure high overload during intermittent operation conditions.

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