Remedial Operations of Permanent Magnet Fault Tolerant Motor for Short-Circuit Fault

Due to their concentrated windings and modular topology, permanent-magnet fault-tolerant (PMFT) motors inherently offer decoupling phases and fault-tolerant capability. Two fault-tolerant drive topologies for these motors, namely H-bridge and star-connection, are presented and compared for short-circuit fault. In order to keep torque performance invariant during the faulty operation, the current amplitude of healthy phases should be increased, and only the phase angle of the adjacent phases should be changed in the H-bridge mode, while both the current amplitude and the phase angle of healthy phases should be changed in the star-connection mode. Both strategies are derived, compared and analyzed. Finally, the simulated results are given, verifying the effectiveness of theoretical analysis.