Fault-tolerant control for one-phase current sensor fault in open-end winding PMSM fed by dual inverter with a common DC bus

This article presents a fault-tolerant control (FTC) for a one-phase current sensor failure in the open-ended winding (OW) permanent magnet synchronous motor (PMSM) fed by the dual inverter with a common DC bus. While many FTC strategies for stator winding and inverter leg faults have been researched, an FTC for one-phase current sensor fault has not been proposed yet. Unlike a single inverter, the dual inverter with a common DC bus needs three-phase current measurement due to the flow of zero-sequence current (ZSC). A one-phase current sensor fault can result in immediate system shutdown or severe degradation in control performance. This study proposes a method for estimating the one-phase current using the currents from the other two phases. Both the FTC and the ZSC control can be implemented in the presence of a one-phase current sensor fault. Experimental results are provided to validate the proposed method.