Fault Diagnosis of the Rotating Rectifier Diode Over a TSSM Based on the Armature Current Calculation and Similarity Measurement

This work proposes a method for detecting the fault of a rotating rectifier. The rotating rectifier is an important part of a three-stage synchronous motor. It is located on the high-speed rotating rotor. The diode in the rectifier is prone to failure owing to the adverse working environment. Our method calculates the rotor armature current of the main exciter, and utilizes the similarity and difference of the current polarity of the three-phase armature current of excitation motor under multiple working states to measure the health status of the rotating rectifier. A similarity measurement algorithm based on the armature current Manhattan distance residual has been proposed, and the fault type and location of the rotating rectifier diode have been found by using the necessary rule for a trade-off. Considering the existence of interference and error, the preset value is employed and compared with the residual function. The results from the experiment have verified the effectiveness of the proposed fault diagnosis method.