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  • 1.
    Austrin, Lars
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    On magnetic amplifiers in aircraft applications2007Licentiate thesis, monograph (Other scientific)
    Abstract [en]

    In the process of designing an electric power supply system for an aircraft, parameters like low weight and low losses are important. Reliability, robustness and low cost are other important factors. In the Saab Gripen aircraft, the design of the primary power supply of the electric flight control system was updated by exchanging a switching transistor regulator to a magnetic amplifier (magamp). By introducing a magamp design, weight was saved and a more reliable power supply system at a lower cost was achieved.

    In this particular case, with the power supply of the electric flight control system in the Saab Gripen fighter, advantage could be taken of a specific permanent magnet generator (PM-generator). The frequency of the generator offered the perfect conditions for a magamp controller. A key parameter in designing magnetic amplifiers (magamps) is low losses. New amorphous alloys offer new possibilities of the technique in designing magnetic amplifiers, because of their extremely low losses.

    The core losses are evaluated by studying the equations and diagrams specifying the power losses. The core losses are evaluated and compared with the copper losses in the process of optimizing low weight and low losses. For this an engineering tool is developed and demonstrated.

    Evaluations of the hysteresis characteristics for the magnetic alloys, as well as modeling and simulation of the core losses, are presented in this work. The modeling of the core losses includes hysteresis losses, eddy current losses and excess losses as well as copper losses. The losses are studied dynamically during realistic operational conditions. The model can be used for any generic analysis of hysteresis in magnetic circuits. Applications of magnetic amplifiers in aircrafts have been demonstrated to be a feasible alternative

  • 2. Austrin, Lars
    et al.
    Krah, Julius
    KTH, Superseded Departments, Electrical Systems.
    Engdahl, Göran
    KTH, Superseded Departments, Electrical Systems.
    A Modeling Approach of a Magnetic Amplifier2003In: Proc. on ICM 2003 International Conference on Magnetism, Rome, Italy, 2003Conference paper (Refereed)
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