Fault Detection and Remedial Strategies for Inter-Turn Short Circuit Faults in a Permanent Magnet Brushless DC Motor

The paper describes Fault detection, diagnosis and remedial strategies taken against turn-to-turn fault in the phases of permanent magnet brushless dc motor drive. The basic idea of the topology considered here is to change the current references and the switching sequences as soon as the fault is detected. The topology requires the availability of neutral for preventing the capacitor midpoint voltage from drifting from the correct point. The achieved results show the feasibility of the proposed scheme for the cases where some amount of reduced performance from the nominal case is allowable.