Low loss permanent magnet excited electric machine

A permanent magnet excited electric machine,

• comprising:
• a stator part;
• and
• a moving part that is movable in relation to the stator part, one of said stator and moving parts having an electric winding system in the form of a single or multiple 3-phase system, and the other one of said stator and moving parts having permanent magnets,
• wherein the permanent magnet excited electric machine is designed for a rated power in the range between 100 kW and 20 MW and the winding system is connected in a delta connection and having an inductance such that the related total reactance xB in rated operation according to:
• xB=ωB·Ly·PB/(Z3P·Ui,B2) is at least 0.8,
• in which
• ωB=electric angular frequency of the winding system in rated operation,
• Ly=phase inductance of the winding system, in star connection or transformed to star connection,
• PB=power of the machine in rated operation,
• Z3P=number of 3-phase systems of the machine,
• Ui, B=amount of the induced conductor voltage in rated operation,
• wherein a short-circuit current of a 3rd harmonic arising in the winding system causes less Ohmic losses in a range between 0.001 and 0.01% of the rated power PB.