Stator Flux Oriented Control of Brushless Doubly Fed Induction Motor Drives Based on Maximum Torque per Total Ampere Strategy

This paper introduces the maximum torque per total ampere (MTPTA) strategy for brushless doubly-fed induction motor (BDFIM) drives, for the first time. In the proposed strategy, the reference of control winding (CW) d-axis current is determined through the well-known search-based approach. Accordingly, by tracking this reference, the magnitude of total stator current is minimized for a given load. In addition, using the reduced order model of BDFIM in the power winding (PW) flux reference frame, the torque expression is derived and it is shown that if the CW d-axis current is forced to zero, the maximum torque per inverter ampere (MTPIA) strategy is achieved to allow the minimum inverter loading. Simulation results are finally proposed to verify the effectiveness of the proposed control strategy.