Study and Active Enhancement by Converter Reconfiguration of the Performance in Terms of Stator Copper Loss, Derating Factor and Converter Rating of Multiphase Drives Under Two Open Legs With Different Stator Winding Connections

Multiphase machines offer inherent tolerance to faults such as open converter legs (OCLs), which are especially frequent. Because of this reason, they particularly attractive for applications where fault is important, offshore wind energy or aerospace, naval and military vehicles. It has been previously shown that, under an OCL, certain stator winding configurations (SWCs) different from star yield smaller copper loss (SCL) larger maximum achievable torque (MAT) than SWC the same command machine. This advantage comes just at expense a moderate increase in rating. However, only case single OCL was studied general. The SCL, MAT required rating two OCLs currently unknown combinations phase number, faulted SWCs. Actually, (unlike one OCL) it may be possible actively modify order faulted/healthy enhance performance these terms, but possibility not so far spite its potential. paper addresses postfault multiphase drives with OCLs, various (derating factor), SCL necessary assessed numerous scenarios. most convenient alternatives established. Most importantly, view conclusions analysis, novel method proposed improve substantially by altering connections between machine terminals. Experimental results six-phase twelve-phase setups provided.