The Application of a Sliding Mode Observer in a Speed Sensor Fault Tolerant PMSM Drive System

Abstract

The fault-tolerant control system (FTCS) for a permanent magnet synchronous motor (PMSM) is presented and an analysis of speed sensor faults is proposed in this paper. The detection and compensation of speed sensor faults is based on the simple comparison of the measured signals with the signals estimated by reduced-order sliding mode observer (SMO). The focus of the work is on the presentation of simulation and experimental research for the most common speed sensor failure types: complete signal loss, gain error, and measurement noise. Additionally, an analysis of different operating conditions of the PMSM drive system is presented, which highlights the system's behaviour under various conditions. The presented algorithm enables the fast detection and compensation of failures with very short detection times, making it a versatile solution for a PMSM drive system and improving its overall reliability.

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“…In accordance with the different locations of faults, drive systems with PMSM are mainly threatened by three kinds of faults: motor fault, inverter fault, and measuring sensor fault [2]. In the case of a major emergency to the motor, it is difficult to implement a compensation architecture for motor malfunction, and the drive should be halted as soon as possible to avoid causing greater losses.The second category of faults usually uses hardware redundancy methods for reconstruction,which contradicts cost reduction and system volume.…”