Saturation interaction in a fault-tolerant induction machine drive due to a zero-sequence stator current

Abstract

Post-fault operation strategies enable an increased fault-tolerance in the case of inverter faults. However, in strategies that apply a zero-sequence stator current, additional space harmonics interact with the fundamental wave. This paper studies this interaction for a 17 Nm, 2900 rpm, 2-pole, 3-phase squirrel cage induction machine. Furthermore, it investigates the effects of this interaction on the torque in the context of the post-fault operation after an open-phase inverter fault of a rotor flux oriented drive.