Investigation of on-Line Parameter Estimation for Interior PMSMs Considering Current Injection and Machine Operating Conditions

Current injection-based on-line parameter estimation for the permanent magnet synchronous motor (PMSM) has been widely investigated in the literature. This paper aims to investigate how different current injection and machine operating conditions influence the accuracy of this approach. In particular, the influences from factors including current injection time, the amplitude of the injected current, motor speed, load torque and stator winding temperature are investigated to understand the estimation performance. The current injection-based estimation approach is implemented on an existing traction PMSM through both simulations and experimental tests. The results will demonstrate how to select current injection conditions appropriately to ensure the estimation performance.