On Inverter Fault-Tolerant Operation Vector Control of a PMSM Drive

The paper describes an investigation of Inverter fault-tolerant vector control for permanent-magnet synchronous motor (PMSM) driven by a fault-tolerant Inverter The Inverter is a topology-modified Inverter with fault-tolerant capability, which can be configured as the standard 3-phase 6-switch inverter under the inverter health condition and reconfigured as 3-phase 4-switch Inverter under the Inverter fault condition respectively By analyzing operating principle of a fault-tolerant Inverter and the mathematic model of PMSM, current and voltage character of three fault-tolerant method (phase A fault-tolerant, phase B fault-tolerant and phase C fault-tolerant) in the fault-tolerant converter are investigated and there is a conclusion that three phase currents of three phase stator windings of PMSM can be controlled effectively by controlling two phase currents of them randomly Then, a novel vector control scheme is proposed to drive PMSM based on the fault-tolerant Inverter The strategy is feasible and simple Simulation results show the validity of the proposed method