Fault Reconstruction Based on Sliding Mode Observer for Current Sensors of PMSM

Abstract EN

This paper deals with a method of phase current sensor fault reconstruction for permanent magnet synchronous motor (PMSM) drives.

A new state variable is introduced so that an augmented system can be constructed to treat PMSM sensor faults as actuator faults.

This method uses the PMSM two-phase stationary reference frame fault model and a sliding mode variable structure observer to reconstruct fault signals.

A logic algorithm is built to isolate and identify the faulty sensor for a stator phase current fault after reconstructing the two-phase stationary reference frame fault signals, which allows the phase fault signals to be reconstructed.

Simulation results are presented to illustrate the functionality of the theoretical developments.