Improved Universal Control Scheme with Voltage Disturbance Observer for Dual Three-Phase PMSM Drives under Single Open-Phase Fault

Natural fault-tolerance performance is becoming popular for dual three-phase permanent magnet synchronous motors (PMSMs) under open-phase fault, as it eliminates the need for control structure reconfiguration and fault diagnosis. Unlike the current constraint imposed by the open-phase fault, little attention has been given to the voltage relationship between the inverter and the motor. In this paper, aiming to address the voltage disturbance by this constraint, an improved universal control scheme has been proposed for dual three-phase PMSM under single open-phase fault. The voltage disturbances have been modelled as dc-type and periodic-type, and then the low-passing filter plus resonator-based disturbance observer has been utilized in control scheme of torque subspace for improving disturbance rejection. The simulation and experimental results are presented to illustrate the effectiveness of the proposed method.