1. Brno University of Technology, FEEC,Department of Power Electrical and Electronic Engineering,Brno,Czech Republic
2. Brno University of Technology, FME,Department of Engineering Mechanics,Brno,Czech Republic
3. Rotary Machines Workgroup,Ateko a.s.,Hradec Kralove,Czech Republic
4. Johannes Kepler University Linz,Institute for Electrical Drives and Power Electronics,Linz,Austria