The eigenvalues analysis of the double star induction machine supplied by redundant voltage source inverter

The authors propose the mathematical model in Park reference frame of squirrel cage induction machine with double star stator windings. Each star is supplied by its own voltage source inverter. The redundancy operating mode of the two inverters improves reliability, availability, since the loss of one inverter does not stop the machine. Moreover, the multiphase stator winding is of a major interest to reduce the space harmonics content. A special attention is paid to analyze the stability by examining the root-locus in complex plan of six order flux model in full speed range. Simulation results are carried out to analyze the influence of the magnetic coupling between two star stator windings on the stability of the motor drive. Copyright (c) 2008 Praise Worthy Prize S.r.l - All rights reserved.