Flux-Weakening Space Vector Control Algorithm for Permanent Magnet Brushless DC Machines

A Flux-Weakening Space Vector Control algorithm (FW-SVC) for Permanent Magnet Brushless DC Machine (PMBDCM) is presented in this paper. It is developed referring to a novel ft reference frame, which enables distinguishing field and torque current components clearly. Therefore, a voltage follower PI regulator has been introduced in order to synthesize the reference field current based on the DC-link voltage deficit. This goal requires coping with non-linearities of the PMBDCM model in order to achieve a suitable trade-off between dynamic and steady-state performances. The effectiveness of the proposed solution is verified through numerical simulations, which regard the comparison between the proposed FW-SVC and both a conventional Current Commutation Control (CCC) and an SVC with no field current injection.