1. Ph.D. Student, Institute of Fundamentals and Theory in Electrical Engineering, Graz Univ. of Technology, Inffeldgasse 18, Graz 8010, Austria (corresponding author).
2. Ph.D. Student, Institute of Fundamentals and Theory in Electrical Engineering, Graz Univ. of Technology, Inffeldgasse 18, Graz 8010, Austria.
3. Institute of Fundamentals and Theory in Electrical Engineering, Graz Univ. of Technology, Inffeldgasse 18, Graz 8010, Austria.
4. BMW Motoren GmbH Steyr, Hinterbergerstraße 2, Steyr 4400, Austria.
5. Ph.D. Student, Lehrstuhl für Prozessmaschinen und Anlagentechnik, Universität Erlangen-Nürnberg, Cauerstraße 4, Erlangen 91058, Germany.
6. Professor, Institute of Fundamentals and Theory in Electrical Engineering, Graz Univ. of Technology, Inffeldgasse 18, Graz 8010, Austria.