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  • 1.
    Lindahl, M.
    et al.
    Division Propulsion and Control (PPC), Bombardier Transportation, Västerås, Sweden; Department of Electric Power and Energy Systems, KTH Royal Institute of Technology, Stockholm, Sweden.
    Trosten, Torbjörn
    Mälardalen University, School of Business, Society and Engineering. Division Propulsion and Control (PPC), Bombardier Transportation, Västerås, Sweden.
    Jansson, D.
    a Division Propulsion and Control (PPC), Bombardier Transportation, Västerås, Sweden.
    Johansson, M. H.
    Division Propulsion and Control (PPC), Bombardier Transportation, Västerås, Sweden.
    Velander, E.
    Division Propulsion and Control (PPC), Bombardier Transportation, Västerås, Sweden.
    Blomberg, A.
    Division Propulsion and Control (PPC), Bombardier Transportation, Västerås, Sweden.
    Nee, H. -P
    Department of Electric Power and Energy Systems, KTH Royal Institute of Technology, Stockholm, Sweden.
    Field test of a silicon carbide metro propulsion system with reduced losses and acoustic noise2021In: IET Electrical Systems in Transportation, ISSN 2042-9738, Vol. 11, no 1, p. 47-57Article in journal (Refereed)
    Abstract [en]

    Results are reported from a successful field test with a silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor (MOSFET) traction inverter. The train has been operated over a 3-month period in the Stockholm metro system. Increased traction inverter power density has been achieved, with volume and weight reductions of 51% and 25%, respectively. Lower power losses permit the use of car motion cooling. A sound pressure level reduction of 9 dB(A) was measured in the field with the higher inverter switching frequency permitted by using SiC. Complementing tests have been performed in the laboratory to compare thermal performance of silicon and SiC in the same power semiconductor housing. Propulsion system power losses are reduced by 19% with SiC. Acoustic noise reductions while increasing switching frequency are also reported. © 2020 The Authors. IET Electrical Systems in Transportation published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.

  • 2.
    Trosten, Torbjörn
    Mälardalen University, School of Business, Society and Engineering.
    Experimental comparison of continuous and discontinuous pulse width modulation on a traction drive considering losses and electromagnetic noiseManuscript (preprint) (Other academic)
  • 3.
    Trosten, Torbjörn
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. Bombardier Transportation, Västerås, Sweden.
    Moskull, Henrik
    Bombardier Transportation, Västerås, Sweden.
    Lindahl, Martin
    Bombardier Transportation, Västerås, Sweden.
    Dahlquist, Erik
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Maher, Azaza
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Energy Optimal Switching Frequency for a 750V Metro Traction Drive Using Silicon Carbide MOSFET Inverter2018In: Energy Optimal Switching Frequency for a 750V Metro Traction Drive Using Silicon Carbide MOSFET Inverter, 2018Conference paper (Refereed)
    Abstract [en]

    The introduction of Silicon Carbide (SiC) MOSFET based inverters into the traction drive makes it possible to increase the inverter switching frequency and reduce energy consumption. This paper describes how to model switching frequency dependent losses in the traction drive and compares the calculated losses to measurements done on a newly developed SiC MOSFET based traction drive. The results from the developed loss models of motor and inverter agrees well with the results from energy measurements. This paper concludes that the energy use of the traction motor and inverter can be simulated well using simple models where skin-effect losses in the motor are modelled in detailed. This paper also concludes that in terms of energy efficiency, the optimal switching frequency using a SiC MOSFET based inverter, is in the range of 3-6 kHz.

  • 4.
    Trostén, Torbjörn
    Mälardalen University, School of Business, Society and Engineering. Alstom.
    Energy efficient control of motors and inverters2024Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The purpose of this licentiate thesis is to research a few key concepts which are important in the development of high efficiency electric drives. The selected research method is quantitative, the raw data have been collected from real world measurements, both from powerlab and from train. The data is analysed and the results are presented in the thesis and associated papers.

    The paper in this thesis describes and evaluates the impact of SiC MOSFET inverters on the traction drive. Furthermore, the papers go into depth about losses within the traction drive and how the electromagnetic noise depends on both the inverter switching frequency and pulse width modulation method. In the papers, results from low fidelity models of both losses and noise are presented, these models offer greater insight into the mechanism behind both losses and electromagnetic noise. Understanding how the motor harmonic losses depends on the current distribution in conductors, can contribute to improved designs of both motors and inverters. An understanding of how electromagnetic noise increases when voltage harmonics coincide with the mechanical modes of resonance of the electric motor, can further contribute to improved designs of both inverters and motors.

    The thesis concludes that when SiC based MOSFETs inverters makes its debut into everyday trains, we can expect significant increases in energy efficiency as well as significantly reductions in electromagnetic noise.

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