Article ID: 25000668
For dual three-phase permanent magnet motors with yokeless and segmented armature (YASA) topology used for electric aircraft propulsion, reliability is a fundamental requirement. Two fault-tolerant control strategies under single-phase open-circuit faults were analyzed in this study: one based on constant magnetomotive force (MMF) and another based on a reduced-order decoupling mathematical model. Minimization of copper loss and maximization of output torque were set as control objectives. Simulation results demonstrate that the motor speed and torque can be maintained at pre-fault levels through fault-tolerant control. However, the connection of the neutral line introduces significant odd harmonics in the current, causing notable torque ripple. Under the constant MMF-based strategy, torque ripple reached 34.35% and 34.38% for the two control objectives when operating at a 50 Nm load. In contrast, the reduced-order decoupling model-based control strategy alleviated this issue by mathematical correction of the post-fault model of the dual three-phase YASA machine, reducing torque ripple the range of 18.45% - 28.00%.
