Post-fault operations of five-phase motor using a full-bridge inverter

This paper compares the post-fault current control strategies of a five-phase permanent magnet motor adopting a half-bridge and a full-bridge converter. The analysis covers both the open circuit of one and two phases. The adoption of the full-bridge converter allows to overcome the constraint of having a zero sum of the currents and this is particularly advantageous under the fault of two phases. The analytical model used to investigate the properties of each post-fault strategy yields more general results that can be applied to any five-phase PM motor. The experimental results validate the theoretical predictions.