An improved flux-weakening strategy for field-oriented-controlled PMSM drives

The permanent magnet synchronous machine (PMSM) dynamic performance is not good in the flux-weakening operation region. The drawbacks of the conventional flux-weakening strategy were analyzed, and a compensator was added to the conventional flux-weakening strategy. The compensator is designed by using the difference of the q-axis current reference and the real current. With this method, the anti-windup control and flux-weakening control can be achieved simultaneously. The simulation and experimental results are used to demonstrate the effectiveness of the proposed flux-weakening strategy.