Flux-Weakening Control of Hybrid-Excited Permanent Magnet Synchronous Motors

This paper deals with the flux-weakening control of hybrid-excited permanent magnet synchronous motors. The flux-weakening operation is achieved by acting both on the stator winding currents and on the rotor excitation winding current. On one hand, a voltage loop is designed for the stator current control, including a proper linearization of the loop. On the other hand, the excitation current reference is generated in a feed-forward manner by reducing the rotor flux linkage for increasing working speeds. The proposed control strategy was validated by means of simulations, comparing the behavior of hybrid-excited permanent magnet motors at high speed with the one of an interior permanent magnet having equal rated parameters.