| Abstract |
This paper develops a generalised approach on flux observer structures in wide speed range for permanent magnet synchronous motors (PMSM) drives using combined topologies of the voltage and current models. Typical applications are in the direct torque and flux control (DTFC) and in the field oriented vector control (FOVC). A critical analysis on the flux estimators structures without corrective terms concludes to combine the advantages of the current models at low speed and the voltage models at medium-high speed. To realise a smooth and monotone transition depending on speed between these models, Luenberger observer structures having the dynamic compensator proportional integral type are used. A critical comparison on eight flux observer structures gives a top classification and useful recommendations. Simulation and experimental results using a DTFC of PMSM drive, including representative flux observers, evaluate the dynamic performances of the observers with real parameter deviations and demonstrate a good global robustness in wide speed range. An improvement will be obtained by on line parameters identifications. |
