Current sensor unanticipated fault detection and compensation of 14.5-meter optical/infrared telescope drive system based on algebraic transformations

Abstract

This paper discusses an unanticipated fault detection, isolation, and compensation (FDIC) strategy for the arc splicing permanent magnet synchronous motor (PMSM) operating under a promising 14.5-meter optical/infrared telescope drive system, specifically focusing on current sensors. The application is based on algebraic transformations that allow not only failure detection but also location and isolation. Besides, detection is performed merely by means of the measured current sensors and does not require additional knowledge or estimators; isolation utilizes information provided by detection to locate where the faults originated and release isolation signals; and compensation is carried out through the remaining currents that are not affected by the faults. It is noted from the results that the performance of FDIC in faulty mode is very acceptable and uncompromising in terms of fault detection, current symmetry, speed tracking, load torque and robustness remedial measures. Therefore, the proposed method can effectively ensure the stable operation of the drive system in the presence of faults.