Observer-Based Phase-Shift Fault Detection Using Adaptive Threshold for Rotor Position Sensor of Permanent-Magnet Synchronous Machine Drives in Electromechanical Brake

Abstract

This paper designs an observer-based fault detection method with an adaptive threshold for a rotor-position-sensor fault of permanent-magnet synchronous motor drives in an electromechanical brake (EMB). The observer does not fully agree with the real process due to model uncertainties and parameter variations. To avoid missing or false alarms, a key design issue of the proposed detection method is the adaptive threshold, which is determined by analyzing position estimation errors of the observer. Experimental results using a test bench of an EMB show the effectiveness of the designed method.