Current Regulation in Multiphase Open-End Winding Machines under Open Circuit Fault

The electric and hybrid electric aircrafts and un-manned aerial vehicles require fault-tolerant propulsion drives capable to provide power to the aircraft propeller in case of partial fault in the motor or power electronics converter. Utilization of the multiphase open-end winding machines allows to continue operation under partial failure with reduced torque with or without torque ripples depending on control strategy used. However, the solution to the optimal current regulation profiles were not derived yet. This paper proposes analytical solution to the current regulation for three- and five-phase open-end winding motors in case of open-circuit fault of a single switch in the traction inverter. The simulation results shows operation of the proposed current regulation strategy in healthy state and after partial failure.