Developing ultra premium efficiency (IE5 class) magnet-free synchronous reluctance motor

This paper describes some aspects of the mathematical modeling and the experimental study of the magnet-free synchronous reluctance motor (SynRM) of IE5 efficiency class (rated power is 750 W, rated speed is 3000 rpm, rated efficiency is 89.5%). The proposed mathematical model allows minimizing the number of the boundary problems which is to be solved and allows calculating power, losses, torque waveform etc. Also the results of experimental comparison of the IE5 magnet-free SynRM prototype and the serially produced magnet-free SynRM of IE4 efficiency class (rated power is 750 W, rated speed is 3000 rpm, rated efficiency is 85.6%) are presented.