Abstract
Fault diagnostic algorithms in motor drives prevent damage to the motor, drive, and overall system by providing an additional level of safety. A single phase open (SPO) fault in a field-oriented controlled drive is one of the perilous faults that require immediate detection due to resulting oscillatory electromagnetic torque. SPO fault results in a significantly high electromagnetic torque ripple. The rapid mechanical vibration caused by the torque ripple exposes the system to failure modes. The single open phase fault detection algorithm proposed in this paper enables the rapid detection of the fault, with minimal system resources, compared to existing methods. Proof of accurate fault detection capability for a wide speed range is presented through simulation and experimental results. The proposed method is also capable of localizing the faulted phase via a novel time domain rotor reference frame current signature analysis.
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